With Additional Chemical Modifications (e.g., Paper, Chemical Pulp, Rayon, Etc.) Patents (Class 604/375)
  • Patent number: 6369291
    Abstract: Disposable underpants 1 according to the invention has an improved sealability at the crotch of user by providing a fitting elastic member 55 and has an absorbent core 7 having an improved shape retention by providing a first nonwoven fabric 73 as an intermediate layer inside the absorbent core 7 and adhering it to the upper and lower layers thereof. Since the absorbent core needs not be heated, inexpensive disposable underpants can be produced. Further, according to an inventive production method, a step of adhering elastic members to an outer sheet 2 and a step of producing inner absorbent members 6 are separately performed, and no heating treatment is performed in the absorbent core production step. Accordingly, the disposable underpants can be produced at a remarkably higher speed.
    Type: Grant
    Filed: January 20, 2000
    Date of Patent: April 9, 2002
    Assignee: Toyo Eizai Kabushiki Kaisha
    Inventors: Kenichi Uchimoto, Iwao Matsuura
  • Publication number: 20020035352
    Abstract: Absorbent article such as a diaper, pant diaper, incontinence guard, sanitary napkin, wound dressing or the like comprising a layer of continuous fibers (9), so called tow, which is bonded in a random pattern where the bonding sites are randomly distributed in the xy- as well as in the z-direction of the layer, but where the fibers otherwise are substantially unbonded to each other. Preferably the layer is bonded by means of so called through-air-bonding. The layer can either be used as a liquid acquisition layer between the topsheet and the absorbent body, as a topsheet or as a combined topsheet and liquid acquisition layer.
    Type: Application
    Filed: September 18, 2001
    Publication date: March 21, 2002
    Inventors: Peter Ronnberg, Kent Vartiainen
  • Patent number: 6359192
    Abstract: Disclosed is an absorbent article comprising an absorbent core with a crotch region and at least one waist region, whereby said crotch region has a lower ultimate fluid storage capability than said at least one waist region. The crotch region further comprises a high flux liquid distribution material having a flux at 12.4 cm of more than 0.075 g/cm2/sec.
    Type: Grant
    Filed: September 27, 1999
    Date of Patent: March 19, 2002
    Assignee: The Procter & Gamble Company
    Inventors: Mattias Schmidt, Gianfranco Palumbo, Bruno Johannes Ehrnsperger, Frank Neumann, Gary D. Lavon, Gerald A. Young
  • Publication number: 20020032421
    Abstract: Disclosed is a nonwoven, absorbent fibrous web, including a layer of airlaid substantially opened fibers. The fibers include more than 70% by weight short fibers. Also included in the web is an interfiber binder.
    Type: Application
    Filed: December 23, 1997
    Publication date: March 14, 2002
    Inventors: JOHN B SCOTT, MAURICE R BAILEY
  • Patent number: 6353149
    Abstract: Disclosed are fast blooming surfactants that are suitable for inclusion in film compositions that will subsequently treated with a low surface energy material to create a surface energy gradient between the underlying polymeric structure of the film and spaced apart microscopic depositions of the low surface energy material. The surfactants have a permeation rate of less than 240 hours, a surface tension in an aqueous solution at a concentration that is greater than the critical micelle concentration that lies between the critical surface tension of the underlying polymeric structure of the web material and the critical surface tension of the low surface energy depositions; and an HLB between about 6 and about 16. Preferred surfactants also have a weight loss on heating to 250° C. that is less than about 20%. More preferred surfactants have a hydrophobic chain that is substantially saturated.
    Type: Grant
    Filed: April 8, 1999
    Date of Patent: March 5, 2002
    Assignee: The Procter & Gamble Company
    Inventor: Keith Joseph Stone
  • Publication number: 20020026166
    Abstract: A unitary absorbent layer composed of a crosslinked cellulosic fibers and a binder is disclosed. In a preferred embodiment, the binder is a bicomponent binding fiber. In combination with one or more other layers in an absorbent article, the unitary absorbent layer can rapidly acquire, distribute, temporarily store, and then release the acquired liquid to other liquid retention layers. Methods for forming the unitary absorbent layer are also disclosed.
    Type: Application
    Filed: August 20, 1998
    Publication date: February 28, 2002
    Applicant: Weyerhaeuser Company
    Inventors: PETER A. GRAEF, COLIN ELSTON, DANIEL T. BUNKER, FRED B. HOWARD, JEFFREY D. MATTHEWS, SHAHROKH A. NAIENI
  • Patent number: 6348133
    Abstract: A smooth-textured non-woven, superabsorbent particle-impregnated fibrous structure is disclosed. The web exhibits an improved smooth surface texture. The structure contains from 50% to 80% of ion sensitive SAP having a particle size of less than 200 microns, wood pulp fibers and cellulose acetate fibers, each in preferred specified amounts indicated herein. The superabsorbent, ion sensitive polymer particle-impregnated fibrous structure is made from an aqueous, wet-lay process in which an aqueous furnish comprises solids of fibers and superabsorbent, ion sensitive polymer and dissolved salt, such as preferably, Na2SO4. The furnish is passed over a moving foraminous support, such as a Fourdrinier wire, and a wet web structure is formed, followed by drying.
    Type: Grant
    Filed: August 3, 2001
    Date of Patent: February 19, 2002
    Assignee: BASF Corporation
    Inventor: G. Thomas Woodrum
  • Publication number: 20020013559
    Abstract: Provided is an absorbent article which includes a backsheet, a liquid-pervious topsheet and an absorbent core sandwiched between the backsheet and the topsheet. At least the backsheet is made from a water-decomposable material. The backsheet is formed of a fibrous sheet that contains water-dispersible fibers and water-insoluble carboxymethyl cellulose. The water-insoluble carboxymethyl cellulose has a degree of etherification (D.S.) falling between 0.3 and 0.6, and is modified so that the hydrogens of at least 95% of carboxylic acids therein are substituted with metal.
    Type: Application
    Filed: June 21, 2001
    Publication date: January 31, 2002
    Applicant: UNI-CHARM CORPORATION
    Inventor: Jyoji Shimizu
  • Publication number: 20020007165
    Abstract: A sanitary absorbent article and a method for manufacturing the same, wherein the article includes an absorbent sheet containing “wet laid” paper. This wet laid paper is treated with adhesive, coated with subperabsorbent material and folded about the absorbent core of the article.
    Type: Application
    Filed: May 3, 2001
    Publication date: January 17, 2002
    Inventors: Igor Philip Passos Proglhof, Leonard G. Rosenfeld
  • Publication number: 20020007168
    Abstract: A breathable disposable absorbent article such as, for example, a diaper, is provided which comprises a top sheet, a backsheet and an absorbent layer therebetween. The top sheet and the backsheet are sealed together to form a unitary structure and include a medial cutout portion on each side which define openings for the leg of the wearer. One or more so-called landing zones are provided on the backsheet, adapted to releasably adhere to fastening tabs located at each side of the article. A liquid impervious sheet or film is laminated to the top surface of the backsheet in order to prevent leakage of fluids and exudates.
    Type: Application
    Filed: April 30, 1999
    Publication date: January 17, 2002
    Inventor: HAMZEH KARAMI
  • Publication number: 20010051796
    Abstract: A dispersible absorbent product comprises a mechanically weakened fibrous web. The dispersible absorbent product can absorb a sufficient amount of fluid without becoming overloaded and suffering from leakage, and is dispersible using a standard toilet. The mechanically weakened regions of the web enhance the dispersibility of the product. Additionally, the dispersible absorbent products may be pre-moistened with a composition. The pre-moistened products are stable in storage, easily dispersible down a toilet, and deliver cleaning, conditioning, and like benefits. Methods of making such dispersible absorbent products are also disclosed.
    Type: Application
    Filed: April 20, 2001
    Publication date: December 13, 2001
    Inventors: Isao Noda, Sarah Beth Gross, Hugh Joseph O'Donnell, James Cameron Horney, Mark Dawson Midkiff
  • Publication number: 20010044612
    Abstract: Multicomponent superabsorbent gel particles are disclosed. The multicomponent particles comprise at least one acidic water-absorbing resin and at least one basic water-absorbing resin. Each particle contains microdomains of the acidic resin and/or the basic resin homogeneously dispersed throughout the particle.
    Type: Application
    Filed: June 13, 2001
    Publication date: November 22, 2001
    Applicant: BASF Aktiengesellschaft
    Inventors: Thomas W. Beihoffer, Michael A. Mitchell
  • Patent number: 6310268
    Abstract: Soft wood pulp sheets, soft absorbent cores, and methods for making the soft wood pulp sheets or soft absorbent cores by addition of non-ionic plasticizers before, during or after the pulp or core manufacturing process are disclosed. Preferred non-ionic plasticizers are ethers or esters such as triacetin, citrates or glycol derivatives.
    Type: Grant
    Filed: August 21, 2000
    Date of Patent: October 30, 2001
    Assignee: Rayonier Products and Financial Services Company
    Inventors: Krishnakumar Rangachari, Kays Chinai
  • Patent number: 6296929
    Abstract: An absorbent member is disclosed which has a high absorbent capacity and which exhibits exceptional expansion properties when wetted by an aqueous fluid. The absorbent member includes a multitude of randomly oriented cellulosic fibers having an average length of from between about 1 mm to about 5 mm and containing at least about 20% lignin within each fiber. The absorbent member also has a moisture content of from between about 1% to about 20% water by weight of fiber and has a density in the range of from between about 0.1 g/cc to about 1 g/cc. The fibers are stressed and bonded by hydrogen bonds and are retained in an elastically stressed condition.
    Type: Grant
    Filed: April 12, 1999
    Date of Patent: October 2, 2001
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventors: Victor Michael Gentile, James Jay Tanner
  • Patent number: 6235966
    Abstract: Absorbent structure (1) consisting of an absorbent material layer (2) of cellulose fibers (4) and a high-loft material layer (3) of synthetic fibers (5), and a method for producing an absorbent structure (1) which is intended for use in an absorbent article. The two layers are held together by being integrated in each other by the fibers (4) of the absorption material (2) extending into cavities in the high-loft material (3). In this method, the absorbent material (2) is mat-formed directly on a high-loft material (3), which is placed on a wire (26). Arranged under the wire (26) there is a suction box (22) which sucks air downwards, the fibers (4) being sucked downwards and penetrating down into the high-loft material (3).
    Type: Grant
    Filed: November 25, 1998
    Date of Patent: May 22, 2001
    Assignee: SCA Hygiene Products AB
    Inventors: Ing-Britt Magnusson, Johanna PĂ„lsson
  • Patent number: 6191340
    Abstract: A disposable absorbent article which is substantially flat prior to use for wearing adjacent a body discharge area, having a body facing surface and a garment facing surface. The disposable absorbent article includes a liquid pervious topsheet, a backsheet, and an absorbent core intermediate the topsheet and backsheet. The absorbent core has a body facing surface and a garment facing surface, and has an expanding layer for expanding the article into a tridimensional structure while being worn by a user. The expanding layer includes a number of smaller expanding elements that are activated by body fluids, are decoupled from one another, and are capable of expanding substantially in only one direction upon activation by body fluids.
    Type: Grant
    Filed: December 23, 1998
    Date of Patent: February 20, 2001
    Assignee: The Procter & Gamble Company
    Inventors: Giovanni Carlucci, Nicola D'Alessio, Gennaro Giorgini, Maurizio Tamburro
  • Patent number: 6176973
    Abstract: An absorbent cellulose product includes cellulose fibers which are cross-linked by reaction with an effective quantity of one or more water-soluble polymers which are produced in advance, which have an average molecular weight of between 350 and 70,000 g/mol, and which possess free acid or aldehyde groups. When the product is being prepared, the cellulose fibers are impregnated with the polymers in aqueous solution. The impregnated substance is dried and defibered at the latest after drying, after which the defibered cellulose fibers are cross-linked in the dry state by means of heating the impregnated, dried and defibered cellulose product.
    Type: Grant
    Filed: January 5, 1998
    Date of Patent: January 23, 2001
    Assignee: Stora Kopparbergs Bergslags Aktiebolag (PUBL)
    Inventor: Leif Norlander
  • Patent number: 6175056
    Abstract: A disposable absorbent article is provided which is substantially flat prior to use for wearing adjacent a body discharge area having a longitudinal centerline and a lateral centerline orthogonal thereto, and defining longitudinal and lateral directions respectively. The disposable absorbent article includes a liquid pervious top sheet, a back sheet joined to the top sheet, and an absorbent core intermediate the back sheet and the top sheet. The absorbent core includes an expanding member for expanding the article into a tridimensional structure while being worn by a user. The expanding member is activated by body fluids. The top sheet is capable of expanding as the absorbent article expands upon activation by body fluids.
    Type: Grant
    Filed: February 24, 1999
    Date of Patent: January 16, 2001
    Assignee: The Procter & Gamble Company
    Inventors: Giovanni Carlucci, Gennaro Giorgini, Nicola D'Alessio, Maurizio Tamburro
  • Patent number: 6150582
    Abstract: The invention clarifies absorption properties of a water-absorbent resin as needed in the case where the ratio by weight of the water-absorbent resin to the total of the water-absorbent resin and the fibrous material is ".alpha.," and further the invention provides an absorbent article using a water-absorbent resin which is optimal to the ratio by weight ".alpha." of the water-absorbent resin. A water-absorbent resin, having a concentration absorption index of 35 or more as shown by the following equation (1):A(1-.alpha.)+B.alpha. (1)wherein A (g/g) is an absorption capacity of the resin under no load, andB (g/g) is an absorption capacity of the resin under a load, is used as the water-absorbent resin as used for the absorbent article of at least 0.4 in the ratio by weight ".alpha." of the water-absorbent resin to the total of the water-absorbent resin and the fibrous material.
    Type: Grant
    Filed: May 21, 1998
    Date of Patent: November 21, 2000
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Katsuyuki Wada, Naoko Takahashi, Hiroko Ueda, Kinya Nagasuna
  • Patent number: 6147028
    Abstract: The present invention relates to microporous starch granules surface coated with a hydrophobic agent said granules useful in absorbing hydrophobic malodorous materials either from the liquid or gas phase. The hydrophobic granules are useful in controlling the malodors associated with catmenials and hygienic undergarments as well as being useful for absorbing unwanted food and other environmental malodors.
    Type: Grant
    Filed: March 11, 1999
    Date of Patent: November 14, 2000
    Assignee: The Procter & Gamble Company
    Inventor: George Peter Rizzi
  • Patent number: 6129717
    Abstract: An absorbent article including an inner sheet and first and second outer sheets. The first outer sheet is of a fine interstice while the second outer sheet is fluid permeable. Through crepe processing, a great number of recesses are formed on an absorbent crepe sheet having wrinkles as the inner sheet. Highly absorbent polymers are charged in the recesses. Then, the first outer sheet adheres to the face on the opening side of the recesses of the inner sheet, while the second outer sheet adheres to the face of the opposite side of the inner sheet. The second outer sheet is positioned toward the side of fluid absorption. When a fluid is applied on the absorbent article, the fluid passes through the second outer sheet onto the inner sheet and the highly absorbent polymers. Because the crepe wrinkles are elongated and extended when the inner sheet absorbs fluid, the recesses are enlarged.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: October 10, 2000
    Assignee: Uni-Charm Corporation
    Inventors: Yoshihisa Fujioka, Ichiro Wada, Chimari Fujita, Norihiko Ishikawa
  • Patent number: 6127594
    Abstract: Absorbent structure consisting of an absorbent material layer of adhesive-free cellulose fibres and an airlaid material layer of adhesive-bonded cellulose fibres, and a method for producing an absorbent structure which is intended for use in an absorbent article. The layers are bonded together by the adhesive of the airlaid material functioning as a binding material and fibres form the absorbent material layer extending into the airlaid material. In the method, the absorbent material is mat-formed on an airlaid material. Alternatively, the absorbent material is mat-formed an airlaid material is then laid on top of it. After the material layers have been laid together, they are compressed at a temperature in excess of 100.degree. C. During the compression, the adhesive of the airlaid material is softened, and the two layers are bonded together. Some of the fibres from the absorption material also penetrate down into the airlaid material and further connection between the layers is achieved.
    Type: Grant
    Filed: November 25, 1998
    Date of Patent: October 3, 2000
    Assignee: SCA Hygiene Products AB
    Inventor: Berit Rosseland
  • Patent number: 6121510
    Abstract: An absorbent article includes at least one containment flap which is configured to maintain a perpendicular, spaced relation away from the absorbent article in use to reduce the flow of body exudates from the article. The article further includes a dewatering layer located on an outer surface of the containment flap for absorbing at least a portion of any exudates which pass over said containment flap in use. The dewatering layer defines an absorbency of at least about 3 grams of saline solution per gram of material. The dewatering layer may further define a total absorbency of at least about 0.5 grams of saline solution and an incline absorbency of at least 1 milliliter.
    Type: Grant
    Filed: December 3, 1997
    Date of Patent: September 19, 2000
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventor: Barbara Oakley Sauer
  • Patent number: 6100441
    Abstract: A material having a high absorptive capacity, for use in an absorbent product, such as a sanitary towel, tampon, incontinence protection, and nappy produced by a highly compressed cellulose-based absorptive material in reel form being finely divided into fragments, and included as a component having a high absorptive capacity in the absorbent structure within the absorbent product, displays good absorptive and swelling properties such as a high assimilation capacity and a high degree of surface dryness the absorbent structure may also contain conventional fluff cellulose pulp and binding fibers.
    Type: Grant
    Filed: June 30, 1997
    Date of Patent: August 8, 2000
    Assignee: SCA Hygiene Products AB
    Inventors: Peter Blomstrom, Anette Buschka
  • Patent number: 6068620
    Abstract: A disposable absorbent garment comprising a topsheet, a backsheet and an absorbent core disposed between the topsheet and backsheet is disclosed. The absorbent core is formed from at least one and preferably more than one laminate comprising three layers, including an upper layer, a lower layer and a central fibrous layer containing from about 50-95% by weight superabsorbent polymer. The upper and lower layers comprise tissue, airlaid fluff pulp or synthetic non-woven fibrous layers. The upper and lower layers together assist to maintain the integrity of the core during manufacture and in use, contain the superabsorbent polymer within the insult area of the garment and act to diffuse multiple insults so that gel blocking is minimized. The absorbent garment thus formed is very thin, lightweight and economical.
    Type: Grant
    Filed: March 30, 1998
    Date of Patent: May 30, 2000
    Assignee: Paragon Trade Brands
    Inventor: Harry J. Chmielewski
  • Patent number: 6060636
    Abstract: Disclosed is an improved structure that includes a nonwoven web including a viscoelastant treatment. The treated web, when contacted by a viscoelastic fluid such as menses alters the viscoelastic properties of the fluid and enhances its wicking and distribution throughout the absorbent structure. A desirable viscoelastant is a alkyl polyglycoside, particularly those having 8 to 10 carbon atoms in the alkyl chain. When applied so as to provide an amount of about 0.1% to about 5.0% solids add-on based on the weight of the dry nonwoven web, rapid fluid wicking and distribution may be obtained. Other viscoelastants are disclosed. Advantageously the treatment may be applied as a high solids composition using conventional application means such as spray coaters and the like or as an internal additive. The absorbent structure finds particular utility as a distribution layer component of a sanitary napkin for absorbing menses as well as other blood handling products such as surgical drapes, for example.
    Type: Grant
    Filed: August 1, 1997
    Date of Patent: May 9, 2000
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventors: Ali Yahiaoui, Jack Nelson Lindon, Arthur Edward Garavaglia, Crystal Sutphin Leach, Connie Lynn Hetzler, Garry Roland Woltman, David Charles Potts
  • Patent number: 6049023
    Abstract: An absorbent article includes an absorbent pad and an outer cover. The absorbent pad includes an absorbent core enveloped by a first layer and a second barrier layer. The first layer and the second barrier layer are secured to each other outwardly of a perimeter of the absorbent core. A deformable third layer is disposed in the absorbent article between the first layer and an outer cover. The deformable layer is adhesively secured to the inner surface of the outer cover. There is no significant securement between the deformable layer and the first layer. In embodiments where the outer cover is extensible in a cross-direction and/or a longitudinal direction, the deformable layer deforms during extension of the outer cover, but such deforming has no significant harmful effect on the first layer. Therefore, damage to the first layer, the second barrier layer, or the absorbent pad, and concomitant release of superabsorbent material from the absorbent pad, is avoided.
    Type: Grant
    Filed: December 31, 1997
    Date of Patent: April 11, 2000
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventors: Timothy James Blenke, Jennifer Elizabeth Pozniak
  • Patent number: 6046378
    Abstract: A wettable article consisting of an article with a hydrophobic surface having a coating which includes a surface free energy modifier and a surface-active agent. The hydrophobic surface may include a hydrophobic polymer. The surface free energy modifier has a surface free energy greater than that of the surface of the article, but less than the surface tension of an aqueous liquid to which the wettable coated article may be exposed. The surface free energy modifier desirably is present in an amount sufficient to substantially cover the surface of the article. The surface-active agent is present in an amount effective to lower the surface tension of the liquid to a value which is greater than the surface free energy of the surface of the article and equal to or less than the surface free energy of the surface free energy modifier. The article desirably is a film or a fibrous web, such as a nonwoven web. Methods of preparing the wettable article also are described.
    Type: Grant
    Filed: March 12, 1997
    Date of Patent: April 4, 2000
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventors: Roger Bradshaw Quincy, III, Elizabeth Deibler Gadsby
  • Patent number: 5998032
    Abstract: The blood absorbence properties, e.g., free swell blood absorbence capacity and after load blood absorbence capacity of superabsorbent materials is enhanced by combining the superabsorbent materials with enhancing agents which serve to enhance the blood absorbent properties thereof. The enhancing agents can be applied to the superabsorbent materials or they can be provided on a fibrous material to be combined with the superabsorbent materials. The enhancing agents are selected from materials that include functionalities that allow them to hydrogen bond to the superabsorbent material when the enhancing agent is applied directly thereto or combined with materials to which the enhancing agents have been applied.
    Type: Grant
    Filed: July 5, 1996
    Date of Patent: December 7, 1999
    Assignee: Weyerhaeuser Company
    Inventors: Michael R. Hansen, Donald D. Halabisky
  • Patent number: 5986166
    Abstract: An absorbent product comprising a liquid permeable surface sheet, a liquid nonpermeable back sheet and an absorbent layer located therebetween, wherein the absorbent layer comprises a water nonswellable synthetic fiber (a) and optionally cellulose fiber (b), and a water-absorbent resin (c), with the weight ratio of (a):(b) being (100 to 20):(0 to 80) and the percentage content of (c) based on the weight sum of (a), (b) and (c) is 25 to 75 weight %. The absorbent layer is treated with polyoxyalkylene-modified silicone surface active agent (d1) and/or a nonsilicone surface active agent having HLB of 8 to 14 (d2). Absorbent products of the present invention exhibit excellent shape retention in the moist state and good permeability and diffusibility for the absorbed liquid. Accordingly, they provide excellent surface dryness, reduced leakage and thus can be comfortably used for a long time and effectively applied to disposable diapers, sanitary napkins and incontinence pads.
    Type: Grant
    Filed: May 30, 1997
    Date of Patent: November 16, 1999
    Assignee: Sanyo Chemcial Industries, Ltd.
    Inventors: Shingo Mukaida, Kazuhiko Iguchi, Kenji Tanaka
  • Patent number: 5868724
    Abstract: A non-continuous absorbent core having a plurality of interconnected strands separated by voids. The strands comprises a porous absorbent macrostructure. The porous macrostructure has interconnected absorbent gelling particles that are surface crosslinked with cationic, preferably polymeric, amino-epichlorohydrin adducts. Upon contacting liquids such as water or body exudates (e.g., urine), the absorbent core can absorb the liquids without undesirable planer expansion. The core is useful in absorbent articles such as diapers, adult incontinence pads, and sanitary napkins are disclosed.
    Type: Grant
    Filed: October 30, 1995
    Date of Patent: February 9, 1999
    Assignee: The Procter & Gamble Company
    Inventors: Albert C. Dierckes, Jr., Kyoko Naga, Ebrahim Rezai, Yung-Wei Tai, Michael S. Kolodesh, Nancy A. Haynes
  • Patent number: 5856248
    Abstract: Cellulose fibers and products comprising such fibers treated to absorb body secretions and to substantially decrease microbial growth, said fibers being chemically treated with a water soluble salt of a transition metal and an alkali and after this with a solution of a bisbiguanide compound, forming a bond between the fibers, the transition metal and the bisbiguanide. Preferred are water-soluble cupric salts as a suitable hydroxide. A preferred bisbiguanide is chlorhexidine. The products can be yarns, knitted, woven, non-woven fabrics, paper gauze and especially bandages, wound dressings, pads, diapers, sanitary napkins, tampons, bed sheets, pants, garments, towels, socks, shoe linings and underwear. Preferably between 0.1 to 3.0 weight per cent copper calculated on the cellulose is bonded to the cellulose.
    Type: Grant
    Filed: April 22, 1996
    Date of Patent: January 5, 1999
    Inventor: Amotz Weinberg
  • Patent number: 5851672
    Abstract: An absorbent material that comprises a water-insoluble, water-swellable absorbent polymer. The absorbent material comprises a reactive polyether chemically bonded to the absorbent polymer whereby the contact angle of blood on a surface of the absorbent material attains from about 0 degree to about 40 degree. Because of the improved wettability with liquids, the absorbent material can provide higher absorbent characteristics with liquids, in particular with blood.
    Type: Grant
    Filed: January 6, 1997
    Date of Patent: December 22, 1998
    Assignee: The Procter & Gamble Company
    Inventors: Lin Wang, Yumiko Hayashi, Ebrahim Rezai
  • Patent number: 5843061
    Abstract: A highly absorbent, flexible and resilient sheet comprising a non-defiberized cellulosic pulp board containing effective amounts of debonding agent and cross-linked cellulosic fibers, well-suited for use as an absorbent component of a disposable, absorbent product such as a sanitary napkin, a diaper, an incontinence pad, an adult brief, a wound dressing and the like. The invention also extends to a method for manufacturing the fluid-absorbent sheet, to a disposable absorbent product utilizing the fluid-absorbent sheet and to a method for enhancing the resilience, fluid-absorbency and flexibility of a non-defiberized cellulosic pulp board.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: December 1, 1998
    Assignee: Johnson & Johnson Consumer Products, Inc.
    Inventors: Gaetan Chauvette, Patricia Ramacieri
  • Patent number: 5817085
    Abstract: A method for the manufacturing of an absorbent structure in an absorbent article, such as a sanitary napkin, tampon, panty protector, wound or sore dressing and like articles is produced by using absorbent material in roll form directly in the product without first defibrating the material and then forming a mat. The material possesses good dispersion properties and swelling properties, which are meaningful to the function of the product. A high surface dryness is obtained, among other things. In addition to cellulose fibers, the absorbent structure may also include superabsorbent material and/or binding fibers, among other ingredients. The pulp mat is very thin, therewith obviating the need to compress the mat further in the product. In the case of certain product applications, the material is softened mechanically prior to its use as an absorbent material.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: October 6, 1998
    Assignee: SCA Molnlycke AB
    Inventors: Urban Widlund, Eje Osterdahl, Roy Hansson, Milan Kolar
  • Patent number: 5814034
    Abstract: A method for the manufacturing of an absorbent structure in an absorbent article, such as a sanitary napkin, tampon, panty protector, wound or sore dressing and like articles is produced by using absorbent material in roll form directly in the product without first defibrating the material and then forming a mat. The material possesses good dispersion properties and swelling properties, which are meaningful to the function of the product. A high surface dryness is obtained, among other things. In addition to cellulose fibers, the absorbent structure may also include superabsorbent material and/or binding fibers, among other ingredients. The pulp mat is very thin, therewith obviating the need to compress the mat further in the product. In the case of certain product applications, the material is softened mechanically prior to its use as an absorbent material.
    Type: Grant
    Filed: August 2, 1995
    Date of Patent: September 29, 1998
    Assignee: Molnlycke AB
    Inventors: Urban Widlund, Eje Osterdahl, Roy Hansson, Milan Kolar
  • Patent number: 5807365
    Abstract: A disposable panty shield comprising a thin, highly absorbent pad having a body-contacting surface, an absorbent layer, a liquid barrier, a positioning means for attaching the pad to an undergarment, and a release layer to protect the positioning means prior to use wherein the has been densified by fusing all pad layers together in a manner such that the interstitial space between the individual fibers in the densified areas is not sufficient to readily allow fluid to flow through. Further, the densified areas are made contiguous such that fluid, when introduced or deposited on the pad, will be prevented or hindered from flowing to the edges of the pad.
    Type: Grant
    Filed: May 7, 1997
    Date of Patent: September 15, 1998
    Assignee: McNeil-PPC, Inc.
    Inventor: Thomas Luceri
  • Patent number: 5770528
    Abstract: The present invention is directed to a method of producing methylated hydroxypropylcellulose (m-HPC). By controlling the degree of methylation, one can manipulate the lower critical solution temperature (LCST) of the m-HPC polymer to below room temperature and thereby stabilize the polymer in water above about 30.degree. C. The present invention is also directed to binder compositions, fibrous substrates, water-dispersible products and thermoformable products containing the m-HPC polymer.
    Type: Grant
    Filed: December 31, 1996
    Date of Patent: June 23, 1998
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventors: Pavneet Singh Mumick, Yihua Chang
  • Patent number: 5766159
    Abstract: A personal hygiene article having an increased capacity for absorbing fluids is disclosed. The article contains a surface layer containing at least one fluid permeable material and a sublayer containing at least about 10 wt. % of a fluffed wood pulp for retaining fluids. Articles of the invention have improved absorbance properties under re-wet conditions even in the absence of organic cross-linking agents or fiber modifiers.
    Type: Grant
    Filed: July 6, 1995
    Date of Patent: June 16, 1998
    Assignee: International Paper Company
    Inventors: Bruce D. Martin, Thomas L. Wiesemann, John D. Shoemaker, Jr.
  • Patent number: 5763044
    Abstract: The present invention relates to fluid pervious, dispersible, and flushable webs particularly suited for use in a disposable absorbent article, such as a diaper, sanitary napkin, panty liner, incontinence pad, or the like. The present invention further relates to such webs which also include an improved, functional textured surface so as to be suitable for use as a topsheet on such a disposable absorbent article.The present invention provides a fluid pervious web which disperses into fragments which are readily flushable in a normal toilet. The web preferably comprises a wetlaid apertured tissue having a temporary wet strength resin incorporated therein. The web preferably further includes a plurality of individual fibrils on a body-facing surface thereof, so as to provide a clean and dry tactile impression in use. The fibrils serve to separate the wearer's skin from the underlying tissue substrate in use.
    Type: Grant
    Filed: November 22, 1995
    Date of Patent: June 9, 1998
    Assignee: The Procter & Gamble Company
    Inventors: Nicholas Albert Ahr, Raymond John Dirk
  • Patent number: 5750446
    Abstract: An absorbent body formed of an absorbent web having a blend of multi-limbed regenerated cellulosic fibers and non-limbed cellulosic fibers has surprisingly improved specific absorption capacity. This absorbent body may be in the form of sanitary napkins, tampons, diapers, and adult incontinence devices.
    Type: Grant
    Filed: December 22, 1995
    Date of Patent: May 12, 1998
    Assignee: McNeil-PPC, Inc.
    Inventors: Hien Nguyen, Nicolas Martens, Glenn Garbolino
  • Patent number: 5741241
    Abstract: An absorbent body intended to form the absorbent element of an absorbent article, such as a diaper, an incontinence guard or a sanitary napkin, includes a first fibre-based absorbent layer which lies proximal to the wearer in use, and a second, fibre-based absorbent layer which is intended to lie distal from the wearer in use, this second layer having a high liquid-dispersing ability. An absorbent body exhibiting particularly good absorption properties has been obtained by including in the first layer (16) a superabsorbent material (18) of high gel-strength and by mixing this superabsorbent essentially uniformly in the fibre material within at least one area of the layer, and by including between the fibre layers (17a, 17b) of the second layer (17) a layer (20) of superabsorbent material.
    Type: Grant
    Filed: October 14, 1994
    Date of Patent: April 21, 1998
    Assignee: SCA Molnlycke AB
    Inventors: Ted Guidotti, Eje Osterdahl
  • Patent number: 5716621
    Abstract: A nonocclusive drug delivery device includes (a) an open cell, flexible, oleophilic thermoplastic resin foam layer, (b) a substantially moisture vapor permeable, liquid impermeable, flexible thermoplastic barrier layer bonded to the upper surface of the foam layer, (c) a pressure sensitive adhesive layer and (d) a drug composition comprising a drug and an oleophilic drug delivery vehicle.
    Type: Grant
    Filed: July 3, 1996
    Date of Patent: February 10, 1998
    Assignee: PharmaDyn, Inc.
    Inventors: Gastone P. Bello, John W. Lyle, Donald A. Johnson
  • Patent number: 5676660
    Abstract: An absorbent product comprising a liquid permeable surface sheet, a liquid nonpermeable back sheet and an absorbent layer located therebetween, wherein the absorbent layer comprises a water nonswellable synthetic fiber (a) and optionally cellulose fiber (b), and a water-absorbent resin (c), with the weight ratio of (a):(b) being (100 to 20):(0 to 80) and the percentage content of (c) based on the weight sum of (a), (b) and (c) is 25 to 75 weight %. The absorbent layer is treated with polyoxyalkylene-modified silicone surface active agent (d1) and/or a nonsilicone surface active agent having HLB of 8 to 14 (d2). Absorbent products of the present invention exhibit excellent shape retention in the moist state and good permeability and diffusibility for the absorbed liquid. Accordingly, they provide excellent surface dryness, reduced leakage and thus can be comfortably used for a long time and effectively applied to disposable diapers, sanitary napkins and incontinence pads.
    Type: Grant
    Filed: January 24, 1996
    Date of Patent: October 14, 1997
    Assignee: Sanyo Chemical Industries, Ltd.
    Inventors: Shingo Mukaida, Kazuhiko Iguchi, Kenji Tanaka
  • Patent number: 5669894
    Abstract: Absorbent members useful in the containment of body fluids such as urine, that have at least one region containing hydrogel-forming absorbent polymer in a concentration of from about 60 to 100% by weight and providing a gel-continuous fluid transportation zone when in a swollen state. This hydrogel-forming absorbent polymer has: (a) a Saline Flow Conductivity (SFC) value of at least about 30.times.10.sup.-7 cm.sup.3 sec/g; (b) a Performance under Pressure (PUP) capacity value of at least about 23 g/g under a confining pressure of 0.7 psi (5 kPa); and (c) a basis weight of at least about 10 gsm. In addition, the region where this hydrogel-forming absorbent polymer is present has, even when subjected to normal use conditions, sufficient wet integrity such that the gel-continuous zone substantially maintains its ability to acquire and transport body fluids through the gel-continuous zone.
    Type: Grant
    Filed: October 1, 1996
    Date of Patent: September 23, 1997
    Assignee: The Procter & Gamble Company
    Inventors: Stephen Allen Goldman, Nancy Ann Haynes, Todd Leon Mansfield, Manfred Plischke, Herbert Louis Retzsch, Trevor Walker, Gerald Alfred Young
  • Patent number: 5649915
    Abstract: A highly absorbent, flexible and resilient sheet comprising a non-defiberized cellulosic pulp board containing effective amounts of debonding agent and cross-linked cellulosic fibers, well-suited for use as an absorbent component of a disposable, absorbent product such as a sanitary napkin, a diaper, an incontinence pad, an adult brief, a wound dressing and the like. The invention also extends to a method for manufacturing the fluid-absorbent sheet, to a disposable absorbent product utilizing the fluid-absorbent sheet and to a method for enhancing the resilience, fluid-absorbency and flexibility of a non-defiberized cellulosic pulp board.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: July 22, 1997
    Assignee: Johnson & Johnson Inc.
    Inventors: Gaetan Chauvette, Patricia Ramacieri
  • Patent number: 5643237
    Abstract: A nonwoven, stain resistant facing for absorbent articles is disclosed. The facing material is in the form of a nonwoven fabric including hydrophobic staple fibers bonded with an absorbent adhesive. The fabric is formed in such a manner as to have a plurality of apertures. The fibers of the fabric and the cured adhesive are coated with a fluorochemical repellant.
    Type: Grant
    Filed: April 14, 1992
    Date of Patent: July 1, 1997
    Assignee: Chicopee
    Inventors: Michael R. Fechillas, Roger Boulanger, Erol Tan
  • Patent number: 5634915
    Abstract: A method of producing an absorbent structure in an absorbent article includes the steps of compressing an air laid web of cellulose fibers into a dry-formed sheet having a first density of between 0.2-1.0 g/cm.sup.2 and mechanically softening the compressed sheet by a noncutting method to a second density, which is lower than the first density, whereby the sheet is delaminated so as to form a plurality of partially separated thin fiber layers, each of which layers exhibits a density which corresponds to the first density.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: June 3, 1997
    Assignee: Molnlycke AB
    Inventor: Eje Osterdahl
  • Patent number: 5634914
    Abstract: Viscose filaments, preferably in staple fibre form, which have a decitex of less than 5.0 and a multi-limbed cross-section, the limbs having a length-to-width aspect ratio of at least 2:1. Examples of multi-limbed cross-sectional shapes are Y--, X--, H-- and T-- shapes. The fibre can be formed into woven, non-woven or knitted fabrics, and is especially useful for absorbent products.
    Type: Grant
    Filed: April 25, 1995
    Date of Patent: June 3, 1997
    Assignee: Courtaulds PLC
    Inventors: Andrew G. Wilkes, Alan J. Bartholomew
  • Patent number: 5599335
    Abstract: Absorbent members useful in the containment of body fluids such as urine, that have at least one region containing hydrogel-forming absorbent polymer in a concentration of from about 60 to 100% by weight and providing a gel-continuous fluid transportation zone when in a swollen state. This hydrogel-forming absorbent polymer has: (a) a Saline Flow Conductivity (SFC) value of at least about 30.times.10.sup.-7 cm.sup.3 sec/g; (b) a Performance under Pressure (PUP) capacity value of at least about 23 g/g under a confining pressure of 0.7 psi (5 kPa); and (c) a basis weight of at least about 10 gsm. In addition, the region where this hydrogel-forming absorbent polymer is present has, even when subjected to normal use conditions, sufficient wet integrity such that the gel-continuous zone substantially maintains its ability to acquire and transport body fluids through the gel-continuous zone.
    Type: Grant
    Filed: March 29, 1994
    Date of Patent: February 4, 1997
    Assignee: The Procter & Gamble Company
    Inventors: Stephen A. Goldman, Nancy A. Haynes, Todd L. Mansfield, Manfred Plischke, Herbert L. Retzsch, Trevor Walker, Gerald A. Young