Hydrophilic Or Hydrophobic Cellular Product Patents (Class 521/905)
  • Patent number: 9919072
    Abstract: Provided according to some embodiments of the invention are wound dressings that include a polymer matrix and nitric oxide-releasing polysiloxane macromolecules within and/or on the polymer matrix. Also provided are wound dressing kits and methods of using and forming such wound dressings.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: March 20, 2018
    Assignee: Novan, Inc.
    Inventors: Nathan Stasko, Susanne Bauman, Pranav R. Joshi
  • Patent number: 8263100
    Abstract: A method of producing a hydrophilic polyurethane foam structure containing a silver salt, chosen from the group of silver sulphate, silver citrate, silver acetate, silver carbonate, silver lactate and silver phosphate, or a mixture of these salts includes the steps of (a) providing a water phase containing a surfactant, and at least one silver salt, wherein the at least one silver salt is dispersed in the water phase; (b) providing a isocyanate-terminated polyether having functionality of more than (2); (c) mixing the water phase and the isocyanate-terminated polyether, immediately transferring the resulting mixture to a mould whereby a foam structure is obtained; and (d) drying the foam structure until it has a moisture content of at most 10% (wt). The hydrophilic polyurethane foam structure produced by the method and a wound dressing containing the foam structure are also described.
    Type: Grant
    Filed: February 13, 2008
    Date of Patent: September 11, 2012
    Assignee: Mölnlycke Health Care AB
    Inventors: Stefan Areskoug, Ulf Johannison, Malin Prydz
  • Patent number: 7005459
    Abstract: The present invention includes a composition having a co-continuous interconnecting channel morphology. These co-continuous interconnecting channels are predominately occupied with a polymer and particles that control the percolation through the composition. The particles are composed of a material such as an absorbing agent, releasing agent and/or activation agent. The polymer composition may be used to form a desired shaped article such as plug type inserts and liners for closed containers, or it may be formed into a film, sheet, bead or pellet.
    Type: Grant
    Filed: November 26, 2003
    Date of Patent: February 28, 2006
    Assignee: CSP Technologies, Inc.
    Inventor: Ihab M. Hekal
  • Patent number: 6990913
    Abstract: The soil mulching process, includes the following stages: mixing together at least two liquid starting substances able to react together to give rise, within a determined time period, to an inert solid final substance while still in the liquid state, pouring the obtained mixture onto the soil surface in a quantity such as to obtain on the soil surface, when the reaction between the components is complete, a layer of the solid substance of a thickness which prevents light passage through it.
    Type: Grant
    Filed: February 7, 2003
    Date of Patent: January 31, 2006
    Assignee: Maxver S.R.L.
    Inventor: Alberto Pedrazzoli
  • Patent number: 6582811
    Abstract: A method of purification of physiological liquids of organism has the step of passing a physiological liquid through a material which has a size, a shape, and a structure selected so as to remove toxic compounds from the physiological liquid and is composed of a partially chloromethylated porous highly crosslinked styrene or divinylbenzene copolymer which initially have surface exposed chloromethyl groups in which thereafter chlorine is replaced with an element which forms different surface exposed functional groups with a greater hydrophilicity and greater biocompatibility than that of the chloromethyl group.
    Type: Grant
    Filed: July 13, 1999
    Date of Patent: June 24, 2003
    Assignee: Renal Tech International LLC
    Inventors: Vedirn Davankov, Maria Tsyurupa, Ludmilla Pavlova, Dzidra Tur
  • Patent number: 6486231
    Abstract: The present invention includes a composition having a co-continuous interconnecting channel morphology. These co-continuous interconnecting channels are predominately occupied with a polymer and particles that control the percolation through the composition. The particles are composed of a material such as an absorbing agent, releasing agent and/or activation agent. The polymer composition may be used to form a desired shaped article such as plug type inserts and liners for closed containers, or it may be formed into a film, sheet, bead or pellet.
    Type: Grant
    Filed: February 14, 2000
    Date of Patent: November 26, 2002
    Assignee: CSP Technologies, Inc.
    Inventor: Ihab M. Hekal
  • Patent number: 6394212
    Abstract: A hydrophilic film coating (11) is formed on outer surfaces of cab (5), equipment housing cover (6) and counterweight (7) of an upper rotary body (2), so that a water film (18) is formed on the surface of the hydrophilic film coating by raindrops or at the time of rainfall. By formation of the water film (18), contaminant substances (13) which have deposited on the outer surfaces of the upper rotary body (2) are urged to float up and carried away with dripping water of the water film (18). As a consequence, it becomes possible to prevent development of raindrop stains on the outer surfaces of the upper rotary body (2) and, even if spattered particles of grease have deposited on the outer surfaces of the upper rotary body (2), such contaminants can be easily washed off, thereby permitting to maintain the quality in outer appearance of the upper rotary body (2).
    Type: Grant
    Filed: August 20, 1999
    Date of Patent: May 28, 2002
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Yutaka Takano, Yasuo Hayakawa, Hideo Hokari, Kazutaka Tateishi
  • Publication number: 20020040820
    Abstract: A hydrophilic film coating (11) is formed on outer surfaces of cab (5), equipment housing cover (6) and counterweight (7) of an upper rotary body (2), so that a water film (18) is formed on the surface of the hydrophilic film coating by raindrops or at the time of rainfall. By formation of the water film (18), contaminant substances (13) which have deposited on the outer surfaces of the upper rotary body (2) are urged to float up and carried away with dripping water of the water film (18). As a consequence, it becomes possible to prevent development of raindrop stains on the outer surfaces of the upper rotary body (2) and, even if spattered particles of grease have deposited on the outer surfaces of the upper rotary body (2), such contaminants can be easily washed off, thereby permitting to maintain the quality in outer appearance of the upper rotary body (2).
    Type: Application
    Filed: August 20, 1999
    Publication date: April 11, 2002
    Inventors: YUTAKA TAKANO, YASUO HAYAKAWA, HIDEO HOKARI, KAZUTAKA TATEISHI
  • Patent number: 6316520
    Abstract: The present invention includes processes and resulting structures for producing a modified polymer having interconnecting channels. The interconnecting channels act as controlled transmission passages through the polymer. A hydrophilic agent is blended into the polymer so that it is distributed within the polymer. In one embodiment, a releasing material is blended into the polymer so that the releasing material is distributed within the product. The product is solidified so that the hydrophilic agent forms passages in the product through which a desired composition is communicable to the releasing material that is entrained within the product. The solidified product may be used to form a desired shaped article such as plug type inserts and liners for closed containers, or it may be formed into a film, sheet, bead or pellet.
    Type: Grant
    Filed: September 18, 1998
    Date of Patent: November 13, 2001
    Assignee: Capitol Specialty Plastics, Inc.
    Inventor: Ihab M. Hekal
  • Patent number: 6194079
    Abstract: The present invention includes processes and resulting structures for producing a modified polymer having interconnecting channels. The interconnecting channels act as controlled transmission passages through the polymer. A hydrophilic agent is blended into the polymer so that it is distributed within the polymer. In one embodiment, an absorbing material is blended into the polymer so that the absorbing material is distributed within the product. The product is solidified so that the hydrophilic agent forms passages in the product through which a desired composition is communicable to the absorbing material that is entrained within the product. The solidified product may be used to form a desired shaped article such as plug type inserts and liners for closed containers, or it may be formed into a film, sheet, bead or pellet.
    Type: Grant
    Filed: September 18, 1998
    Date of Patent: February 27, 2001
    Assignee: Capitol Specialty Plastics, Inc.
    Inventor: Ihab M. Hekal
  • Patent number: 6174952
    Abstract: The present invention includes processes and resulting structures for producing a modified polymer having interconnecting channels. The interconnecting channels act as controlled transmission passages through the polymer. A hydrophilic agent is blended into the polymer so that it is distributed within the polymer. In one embodiment, a water-absorbing material is blended into the polymer so that the water-absorbing material is distributed within the product. The product is solidified so that the hydrophilic agent forms passages in the product through which a desired composition is communicable to the water-absorbing material that is entrained within the product. The solidified product may be used to form a desired shaped article such as plug type inserts and liners for closed containers, or it may be formed into a film, sheet, bead or pellet.
    Type: Grant
    Filed: September 18, 1998
    Date of Patent: January 16, 2001
    Assignee: Capitol Specialty Plastics, Inc.
    Inventors: Ihab M. Hekal, Robert S. Langer, Alexander M. Klibanov, Edith Mathiowitz
  • Patent number: 6136424
    Abstract: A method of purification of physiological liquids of organism has the step of passing a physiological liquid through a material which has a size, a shape, and a structure selected so as to remove toxic compounds from the physiological liquid and is composed of a partially chloromethylated porous highly crosslinked styrene or divinylbenzene copolymerwhich initially have surface exposed chloromethyl groups in which thereafter chlorine is replaced with an element which forms different surface exposed functional groups with a greater hydrophilicity and greater biocompatibility than that of the chloromethyl group.
    Type: Grant
    Filed: February 6, 1998
    Date of Patent: October 24, 2000
    Assignee: Renal Tech International, LLC
    Inventors: Vadim Davankov, Maria Tsyurupa, Ludmila Pavlova, Dzidra Tur
  • Patent number: 6130263
    Abstract: The present invention includes processes and resulting structures for producing moisture absorbing desiccant entrained polymers. A polymer is caused to assume a molten state, typically by applying heat and melting the polymer. To achieve certain results in the hardened end product, such as rigidity and durability, the polymer normally acts as a moisture barrier in a solidified state, both before and after melting. A desiccating agent is blended into the polymer so that the desiccating agent is distributed within the polymer. A channeling agent is also blended into the polymer so that it is distributed within the polymer. The blending of the components is preferably done before the polymer is caused to assume a molten state. Together, the polymer, desiccating agent and channeling agent create a blended mixture. The mixture is solidified so that the channeling agent forms passages in the mixture through which moisture is communicable to desiccating agent that is entrained within the mixture.
    Type: Grant
    Filed: March 5, 1997
    Date of Patent: October 10, 2000
    Assignee: Capitol Specialty Plastics, Inc.
    Inventor: Ihab M. Hekal
  • Patent number: 6027795
    Abstract: An absorbent, microporous foam comprising a crosslinked polymer having interconnected fluid cells distributed throughout its mass, wherein the fluid cells have a diameter of between about 0.1 and about 100 .mu.m, and wherein the foam can rapidly absorb at least about twice its dry weight in fluid, is disclosed. Also disclosed is a method for producing such microporous, absorbent foams. In this method: (a) a crosslinkable polymer and a first solvent are mixed to form a stable solution which can be induced to phase separate; (b) the stable solution is induced to phase separate into a polymer concentrated phase and a polymer dilute phase; (c) the polymer is induced to crosslink in the polymer concentrated phase for a predetermined period of time thereby forming a microporous material; and (d) the microporous material is dried to produce the absorbent foam.
    Type: Grant
    Filed: March 17, 1997
    Date of Patent: February 22, 2000
    Assignee: University of Cincinnati
    Inventors: Bhagwati G. Kabra, Stevin H. Gehrke
  • Patent number: 6013688
    Abstract: Methods for making microporous polyvinylidene fluoride (PVDF) membranes from vinylidene fluoride polymers and the products produced. The PVDF microporous membranes have a significantly faster flow rate at a given pore size as compared to equally-sized microporous membranes made by conventional procedures. The PVDF microporous membranes also have significantly smaller pore sizes than conventional microporous PVDF membranes. The present membranes have unique macrostructural features responsible, in part, for their unique functional properties. The process includes dissolving the polymer in a liquid that includes a solvent and a co-solvent for the polymer. The dissolution of the polymer can be at temperatures ranging from about 20.degree. C. to about 50.degree. C. while the formation of the microporous membrane can be at temperatures ranging from about -10.degree. C. to 50.degree. C.
    Type: Grant
    Filed: March 18, 1996
    Date of Patent: January 11, 2000
    Assignee: Corning Costar Corporation
    Inventors: Manuel M. Pacheco, John F. Pacheco
  • Patent number: 5985434
    Abstract: Disclosed is an absorbent foam that exhibits desirable softness and flexibility properties yet is highly absorbent. In one embodiment, the absorbent foam comprises a water-swellable, water-insoluble polymer wherein the absorbent foam exhibits a Free Swell value of at least about 10 grams of liquid per gram of absorbent foam and a Softness value that is less than about 30 grams of force per gram per square meter of absorbent foam. In a second embodiment, the absorbent foam has an average cell size of the cells in the absorbent foam between about 10 microns to about 100 microns and an average wall thickness of the cells in the absorbent foam between about 0.1 micron to about 30 microns. Such an absorbent foam may be used in a disposable absorbent product intended for the absorption of fluids such as body fluids.
    Type: Grant
    Filed: November 25, 1997
    Date of Patent: November 16, 1999
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventors: Jian Qin, Palani Raj Ramaswami Wallajapet, Gary D. Williams
  • Patent number: 5981070
    Abstract: A manufacturing method of water-absorbent agent powders of the present invention is a method of a reducing an amount of a residue of an epoxy crosslinking agent remaining therein by adding a nucleophilic reagent in a form of powder to surface region crosslinked water-absorbent resin powders having a carboxyl group under an applied heat in which the residue of the crosslinking agent remains. Since the method permits an amount of the residue of the crosslinking agent to be reduced by adding a nucleophilic reagent to the heated water-absorbent resin powders, the water-absorbent agent powders exhibiting well-balanced properties which are mutually negatively correlated from one another, i.e., high absorbency under pressure, a reduced amount of a residue of the epoxy crosslinking agent and a high absorbing rate compared with the conventional surface region crosslinked water-absorbent resin powders can be achieved.
    Type: Grant
    Filed: March 3, 1997
    Date of Patent: November 9, 1999
    Assignee: Nippon Shokubai Co., Ltd
    Inventors: Kunihiko Ishizaki, Kinya Nagasuna, Nobuyuki Harada
  • Patent number: 5976434
    Abstract: Polypropylene (PP) membranes having a hydrophilic surface have been prepared by extracting a fugitive hydrophilic pore-forming agent from a gelled film prepared by evaporating the solvent from a homogeneous solution of isotactic polypropylene, functionalized polypropylene and the fugitive agent in a solvent, such as xylene. Most of the functional groups, such as --OH, --NH.sub.2 and --COOH, in the functionalized polypropylene are located on the surfaces of the membrane, including pore surfaces. The resulting membranes, especially membranes having an asymmetric structure, are useful for ultrafiltration, dialysis and/or microfiltration.
    Type: Grant
    Filed: April 6, 1998
    Date of Patent: November 2, 1999
    Assignee: The Penn State Research Foundation
    Inventor: Tze-Chiang Chung
  • Patent number: 5968643
    Abstract: A microporous, hydrophilic polymer film has a morphology composed of distinctively interconnected pores, which are desirably surface-open. In particular aspects, the film can provide for a water vapor transmission rate (WVTR) value of at least about 1000 grams per square meter per 24 hours per mil (0.00254 cm) of film thickness. The film can exhibit a modulus of not less than about 1 MPa, and may also exhibit an elongation strain at break of at least about 100% in both its machine and transverse directions. The film can also provide for a water contact angle of not more than about 80 degrees. In other aspects, the porous film can also include other properties or characteristics, such as a desired tensile strength at break, a desired elongation-at-break, and voids or pores having distinctive shapes, sizes, distributions and configurations.
    Type: Grant
    Filed: September 16, 1997
    Date of Patent: October 19, 1999
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventors: Vasily Aramovich Topolkaraev, Fu-Jya Tsai
  • Patent number: 5942029
    Abstract: A mechanically-bonded, water-absorbent fiber mulch including natural and crimped synthetic fibers that are intimately mixed to form a mechanically-bonded fiber mulch.
    Type: Grant
    Filed: April 16, 1997
    Date of Patent: August 24, 1999
    Assignee: Kevin S. Spittle
    Inventor: Kevin Scott Spittle
  • Patent number: 5837365
    Abstract: Polypropylene (PP) membranes having a hydrophilic surface have been prepared by extracting a fugitive hydrophilic pore-forming agent from a gelled film prepared by evaporating the solvent from a homogeneous solution of isotactic polypropylene, functionalized polypropylene an the fugitive agent in a solvent, such as xylene. Most of the functional groups, such as --OH, --NH.sub.2 and --COOH, in the functionalized polypropylene are located on the surfaces of the membrane, including pore surfaces. The resulting membranes, especially membranes having an asymmetric structure, are useful for ultrafiltration, dialysis and/or microfiltration.
    Type: Grant
    Filed: April 8, 1996
    Date of Patent: November 17, 1998
    Assignee: The Penn State Research Foundation
    Inventor: Tze-Chiang Chung
  • Patent number: 5780523
    Abstract: The present invention relates to a pressure sensitive adhesive foam with a percentage of theoretical density less than 90 wherein the foam has an intrinsic adhesion of greater than about 1 N/cm and a compression set under constant deflection of less than about 60%. The present invention further includes a pressure sensitive adhesive foam comprising a thermoplastic block copolymer; a tackifying resin; an isocyanate terminated monomer or oligomer; a polymer comprising a backbone of selected from the group consisting of polybutadiene, polyester and polyether, wherein the polymer contains at least 2 active hydrogens capable of reacting with the isocyanate terminated monomer; and expandable particulate materials. The invention finally further comprises a method of forming the above film.
    Type: Grant
    Filed: June 17, 1997
    Date of Patent: July 14, 1998
    Assignee: Norton Performance Plastics Corporation
    Inventors: Dominique Petit, Michel Ladang
  • Patent number: 5779782
    Abstract: A mechanically-bonded, water-absorbent fiber mulch including natural and crimped synthetic fibers that are intimately mixed to form a mechanically-bonded fiber mulch. A water-absorbent polymer-based material is dispersed throughout the fiber mulch to increase its water absorption capacity.
    Type: Grant
    Filed: June 7, 1996
    Date of Patent: July 14, 1998
    Inventor: Kevin Scott Spittle
  • Patent number: 5763682
    Abstract: A hydrophilic polyol having a molecular weight of less than about 4500 and comprising ethylene oxide units and alkylene oxide units selected from propylene oxide, butylene oxide and mixtures thereof in a weight ratio of ethylene oxide units to alkylene oxide units in the range of from about 95:5 to about 60:40, the polyol having a secondary hydroxyl content of at least about 80% based on the total hydroxyl content of the polyol. A process for producing the hydrophilic polyol is also described.
    Type: Grant
    Filed: December 21, 1995
    Date of Patent: June 9, 1998
    Assignee: Woodbridge Foam Corporation
    Inventor: Terry L. Moore
  • Patent number: 5719201
    Abstract: A foamed isocyanate-based polymer having a cellular structure and containing a superabsorbent material, the polymer being capable of: (i) absorbing at least about 20 times its weight of an aqueous fluid maintained at a temperature of from about 20.degree. to about 25.degree. C., and (ii) retaining at least about 20 times its weight of absorbed aqueous fluid which is bound to the superabsorbent material. A process for producing a foamed isocyanate-based polymer comprising the steps of: providing a substantially uniform mixture comprising an isocyanate, an active hydrogen-containing compound and a superabsorbent material, the superabsorbent material being capable of absorbing at least about 20 times its weight of an aqueous fluid maintained at a temperature in the range of from about 20.degree. to about 25.degree. C.
    Type: Grant
    Filed: November 9, 1995
    Date of Patent: February 17, 1998
    Assignee: Woodbridge Foam Corporation
    Inventor: Robert N. Wilson
  • Patent number: 5686502
    Abstract: Disclosed is a water blown, open cell, hydrophilic polyurethane foam, a process for preparing such a foam and articles made therefrom. Utilizing a one step process the foam is formed from a reaction mixture comprising an organic polyisocyanate, water, a reaction catalyst and a mixture of certain polyols. The first polyol utilized in the invention is a poly(oxyalkylene) triol, chain terminated with propylene oxide and having a molecular weight in the range of about 2800 to about 6200. The second polyol is a poly(oxyalkylene) polyol, chain terminated with ethylene oxide or propylene oxide and having a molecular weight in the range of about 60 to about 800. The third polyol comprises at least one selected from the group of (i) poly(oxyalkylene) diols chain terminated with ethylene oxide and having a molecular weight in the range of about 500 to about 4000 and (ii) polyfunctional polyols chain terminated with propylene oxide and having a molecular weight in the range of about 250 to about 1000.
    Type: Grant
    Filed: June 24, 1996
    Date of Patent: November 11, 1997
    Assignee: Polyfoam Products, Inc.
    Inventors: Pat L. Murray, E. Richard Huber
  • Patent number: 5674917
    Abstract: A foamed isocyanate-based polymer having a cellular structure and containing a superabsorbent material, the polymer being capable of: (i) absorbing at least about 20 times its weight of an aqueous fluid maintained at a temperature of from about 20.degree. to about 25.degree. C., and (ii) retaining at least about 20 times its weight of absorbed aqueous fluid which is bound to the superabsorbent material. A process for producing a foamed isocyanate-based polymer comprising the steps of: providing a substantially uniform mixture comprising an isocyanate, an active hydrogen-containing compound and a superabsorbent material, the superabsorbent material being capable of absorbing at least about 20 times its weight of an aqueous fluid maintained at a temperature in the range of from about 20.degree. to about 25.degree. C.
    Type: Grant
    Filed: March 30, 1995
    Date of Patent: October 7, 1997
    Assignee: Woodbridge Foam Corporation
    Inventor: Robert N. Wilson
  • Patent number: 5650450
    Abstract: Hydrophilic polyurethane foams with rapid wet out properties are formed from the reaction product of an MDI-based or polymeric MDI-based isocyanate capped prepolymer with an aqueous component, such as water, and about 0.5 to 2.0 parts by weight, based on 100 parts by weight prepolymer, of a silicone glycol copolymer liquid surfactant with a polyether portion, said surfactant having a viscosity of about 175 to 350 CST at 25.degree. C., a molecular weight in the range of about 1500 to 20,000, with the polyether portion having a molecular weight in the range of about 200 to 2000 and containing about 40 to 100 percent by weight ethylene oxide. The surface of the hydrophilic foam wets out or absorbs droplets of water in less than thirty (30) seconds, preferably instantaneously (less than one second).
    Type: Grant
    Filed: January 25, 1996
    Date of Patent: July 22, 1997
    Assignee: Foamex L.P.
    Inventors: Joseph W. Lovette, Sharon A. Free
  • Patent number: 5591542
    Abstract: A battery having a positive electrode, a negative electrode is equipped with a diaphragm between the electrodes. The diaphragm includes a hydrophilized polymer porous body with pores in which ethylene copolymer particles are held, having a melting point of 80.degree. to 170.degree. C., and side chains.
    Type: Grant
    Filed: September 30, 1994
    Date of Patent: January 7, 1997
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takeshi Sakamoto, Koji Hara, Akira Harada
  • Patent number: 5554659
    Abstract: A molded porous polyvinyl alcohol sponge includes an outer skin capable of absorbing and passing water to interior portions of the sponge, and is substantially smooth except for predetermined structural details imparted by the mold used in its making. The outer skin has smaller average pore size than does the interior portion of the product.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: September 10, 1996
    Inventor: Solomon Rosenblatt
  • Patent number: 5504163
    Abstract: Residual chloromethyl groups in methylene-bridged aromatic polymer adsorbents are susceptible to hydrolysis to benzyl alcohol groups and oxidation to benzoic acid groups. The introduction of these hydroxyl and carboxylic acid groups contributes to the water adsorption capacity or hydrophilicity of these adsorbents. Unfortunately, this hydrophilicity interferes with the utility of these resins as adsorbents for volatile organic compounds. By capping these residual chloromethyl groups with hydrophobic aromatic compounds prior to their opportunity to hydrolyze or oxidize, the hydrophobicity of methylene-bridged aromatic polymer adsorbents is increased and their utility for the absorption of organic compounds is enhanced.
    Type: Grant
    Filed: December 21, 1994
    Date of Patent: April 2, 1996
    Assignee: The Dow Chemical Company
    Inventors: Marvin H. Tegen, Kenneth C. Jones
  • Patent number: 5474740
    Abstract: The present invention relates to apparatus for transferring constituents into and out of a fluid such as blood. The apparatus includes a biphasic foam body which functions as a blood oxygenator, blood dialyzer, or other blood mass transfer device.
    Type: Grant
    Filed: September 2, 1994
    Date of Patent: December 12, 1995
    Inventors: Leonard A. Trudell, Anthony D. Whittemore
  • Patent number: 5389692
    Abstract: A co-polymer composition for coating porous structural material includes a compatible surfactant resulting in a structural inter-bonding between the coating composition and the structural material. The co-polymer composition cured in a layer of unsupported foam has sufficient strength to be used as a substitute for comparably or larger sized layers of re-enforced concrete for conducting fluids while resisting compressive loads. A co-polymer foam composition for coating structural material cures to have an atmosphere-facing surface that is substantially impervious to corrosive substance penetration.
    Type: Grant
    Filed: August 25, 1993
    Date of Patent: February 14, 1995
    Inventor: Richard L. Bertram
  • Patent number: 5349040
    Abstract: Disclosed herein is a two-component polyurethane adhesive containing an isocyanate component a), an active hydrogen containing component which is stable against demixing b), optionally a catalyst for the reaction of a) with b) and optionally an auxiliary agent and an additive, characterized in that an active hydrogen containing component which is stable against demixing b) contains at least one hydroxyl group-containing low molecular weight chain lengthening agent having at least one C-C double bond or C-C triple bond and having a molecular weight of at least 86 and a functionality of at least 2 and containing no carboxyl groups.
    Type: Grant
    Filed: October 11, 1991
    Date of Patent: September 20, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rainer Trinks, Heinrich Konigshofen, Otto Ganster, Horst Stepanski, Jose Colinas-Martinez
  • Patent number: 5336695
    Abstract: Hydrophilic foams based on a polyurethane gel material which can be obtained fromone or more polyether-polyols selected from the group comprising substances formed by the addition of propylene oxide and optionally ethylene oxide on to conventional starter molecules,one or more diisocyanates,one or more superabsorbers,one or more accelerators selected from the group comprising conventional accelerators for polyurethanes,water, and optionallyconventional auxiliary substances and/or additives.
    Type: Grant
    Filed: October 4, 1993
    Date of Patent: August 9, 1994
    Assignee: Beiersdorf Aktiengesellschaft
    Inventors: Martina Nass, Heidi Sacker
  • Patent number: 5260345
    Abstract: Disclosed are absorbent foam materials suitable for use as or in the absorbent cores of absorbent articles, such as diapers which absorb and retain aqueous body fluids. Such foam materials comprise hydrophilic, flexible open-celled structures which are preferably prepared by polymerizing high internal phase (HIPE) water-in-oil emulsions. Such foam materials have a pore volume of from about 12 to 100 mL/g, and a capillary suction specific surface area of from about 0.5 to 5.0 m.sup.2 /g. These materials also exhibit a resistance to compression deflection such that a confining pressure of 5.1 kPa produces after 15 minutes a strain of from about 5% to 95% compression when the material is saturated at 37.degree. C. to its free absorbent capacity with synthetic urine.
    Type: Grant
    Filed: August 12, 1991
    Date of Patent: November 9, 1993
    Assignee: The Procter & Gamble Company
    Inventors: Thomas A. DesMarais, Keith J. Stone, Hugh A. Thompson, Gerald A. Young, Gary D. LaVon, John C. Dyer
  • Patent number: 5244930
    Abstract: The present invention relates to apparatus for transferring constituents into and out of a fluid such as blood. The apparatus includes a biphasic foam body which functions as a blood oxygenator, blood dialyzer, or other blood mass transfer device.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: September 14, 1993
    Assignee: Brigham and Women's Hospital
    Inventors: Leonard A. Trudell, Anthony D. Whittemore
  • Patent number: 5231116
    Abstract: A urethane prepolymer composition useful as sealant is disclosed. The composition comprises a reaction product of an organic polyisocyanate and a polyether polyol mixture at an NCO/OH equivalent ratio from 1.6 to 2.5. The polyether polyol mixture contains (a) from 75 to 95 % by weight of the mixture of a polyoxyalkylenediol having an average MW from 400 to 1,000 and an oxyethlene unit content greater than 50 % by weight, and (b) the balance of the mixture of a polyoxyalkylenetriol having an average MW from 5,000 to 10,000 and an oxyethylene unit content greater than 50 % by weight. An equivalent composition is produced by reacting the polyoxyalkylenediol and polyoxyalkylenetriol with the organic polyisocyanate separately and mixing together after the reaction.
    Type: Grant
    Filed: July 22, 1991
    Date of Patent: July 27, 1993
    Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.
    Inventors: Takashi Sano, Hidehiro Uchikata
  • Patent number: 5207705
    Abstract: An implantable medical prosthesis is provided having a uniform mixture of foam polyurethane and collagen. The prosthesis can be shaped into an elongated hollow body tube useful for implantation in an animal. Alternatively, the prosthesis can be shaped into biocompatible units useful as soft-tissue replacements or as matrices for sustained-release vehicles.
    Type: Grant
    Filed: June 28, 1991
    Date of Patent: May 4, 1993
    Assignee: Brigham and Women's Hospital
    Inventors: Leonard A. Trudell, Anthony D. Whittemore
  • Patent number: 5171309
    Abstract: The invention provides novel polyesters, fibers and films, nonwovens from the fibers and disposable products of the polyesters such as diapers. The products are degradable under the conditions typically existing in waste composting processes, have low ingredient costs and yet provide strength and toughness properties adequate for end uses such as in disposable diapers. The polyesters are based upon polyethylene terphthalate copolymerized with a cycloaliphatic diacid, preferably hexahydroterephthalic acid, and containing alkali metal or alkaline earth metal sulfo groups, such as a metal 5-sulfoisophthalic acid derivative.
    Type: Grant
    Filed: February 13, 1992
    Date of Patent: December 15, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Francis G. Gallagher, Cathy J. Hamilton, Steven M. Hansen, Hyunkook Shin, Raymond F. Tietz
  • Patent number: 5171308
    Abstract: The invention provides novel polyesters, fibers and films, nonwovens from the fibers and disposable products of the polyesters such as diapers. The products are degradable under the conditions typically existing in waste composting processes, have low ingredient costs and yet provide strength and toughness properties adequate for end uses such as in disposable diapers. The polyesters are based upon polyethylene terephthalate copolymerized with a non-aromatic diacid, such as adipic and glutaric acids, and containing alkali metal or alkaline earth metal sulfo groups, such as a metal 5-sulfoisophthalic acid derivative.
    Type: Grant
    Filed: February 13, 1992
    Date of Patent: December 15, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Francis G. Gallagher, Cathy J. Hamilton, Steven M. Hansen, Hyunkook Shin, Raymond F. Tietz
  • Patent number: 5164421
    Abstract: Hydrophilic polyurethane foams containing residues of a polyalkylene glycol monoalkyl or alkaryl ether may be produced by reacting the ether with an isocyanate having a functionality of greater than two and using only stoichiometric amounts or small excesses e.g. up to 12% of weight of water as foaming agent. Methyl, lauryl, cetyl, octylphenyl and nonyl phenyl ethers may be used. The foams are applicable for the manufacture of absorptive devices such as wound dressings, sanitary towels, diapers, incontinence pads or tampons.
    Type: Grant
    Filed: July 3, 1991
    Date of Patent: November 17, 1992
    Assignee: Smith and Nephew Associated Companies plc
    Inventors: Sinan B. Kiamil, Ashok L. Patel
  • Patent number: 4997858
    Abstract: A method for preparing a flexible polyurethane foam, wherein a polyether-polyol having an average molecular weight from 1000 to 8000 and an average functionality not larger than 4, is brought into reaction with an organic polyisocyanate in the presence of a foam stabilizer, a catalyst and blowing agent comprising methylformate, wherein a cross-linker/extender and/or amine catalyst with delayed action is added to said reaction mixture.
    Type: Grant
    Filed: April 14, 1989
    Date of Patent: March 5, 1991
    Assignee: Recticel
    Inventors: Lucien Jourquin, Eddie Du Prez, Patrick Demeyer, Rudi Mortelmans
  • Patent number: 4985467
    Abstract: A highly hydrophilic polyurethane article, which is the skeletal network of a cellular polyurethane foam subjected to a reticulation process wherein the polyurethane contains up to 100 parts of a superabsorbent material per hundred parts of polyol used in preparing the polyurethane, is useful in absorbing and holding large amounts of aqueous liquids is prepared by:(a) mixing a polyisocyanate, a polyol and a blowing agent with a finely divided superabsorbent material which is insoluble in a liquid which the material absorbs and which absorbs at least 15 times its weight of said liquid,(b) reacting the polyisocyanate, polyol and blowing agent under foaming conditions to produce a foam of polyurethane which cmprises a multitude of gas cells or bubbles within the polyurethane matrix,(c) curing said foam of polyurethane, forming a cellular structure with windows or membranes of solid polyurethanes present between gas cells or bubbles,(d) removing the windows or membranes by thermal reticulation thereby leaving the
    Type: Grant
    Filed: April 12, 1989
    Date of Patent: January 15, 1991
    Assignee: Scotfoam Corporation
    Inventors: David J. Kelly, Dai W. Kim
  • Patent number: 4940737
    Abstract: A class of modified hydrophilic prepolymers and polymers is disclosed which are characterized by their specific reactivity. Isocyanate-capped oxyethylene-based prepolymers are modified by reacting with a compound having an isocyanate-reactive group which is a sulfhydryl group, an amino group, a hydroxyl group or a carboxyl group, and a non-isocyanate-reactive group, in quantities sufficient to modify at least a portion of the isocyanate groups of the prepolymer. Where said first functional group is an amino group contained in a diamine or polyamine compound or is a carboxyl group, the modifying compound is present in quantities sufficient to modify all or substantially all of the isocyanate groups of the prepolymer.
    Type: Grant
    Filed: November 2, 1988
    Date of Patent: July 10, 1990
    Assignee: W. R. Grace & Co.-Conn
    Inventors: James A. Braatz, Aaron H. Heifetz, Richard A. Wolfe, Narender P. Luthra
  • Patent number: 4912141
    Abstract: Disclosed is new type of implantable material for replacement of cartilaginous or fibrous tissue. The material has controlled porosity and is biocompatible. A method for making this material is also disclosed.
    Type: Grant
    Filed: July 28, 1987
    Date of Patent: March 27, 1990
    Inventor: Joseph H. Kronman
  • Patent number: 4902511
    Abstract: Disclosed is new type of implantable material for replacement of cartilaginous or fibrous tissue. The material has controlled porosity and is biocompatible. A method for making this material is also disclosed.
    Type: Grant
    Filed: July 24, 1989
    Date of Patent: February 20, 1990
    Inventor: Joseph H. Kronman
  • Patent number: 4886836
    Abstract: A porous chemically activated medium having a low affinity for peptide group-containing materials is provided comprising a porous polymeric medium having a low affinity for peptide group-containing materials covalently bound to a residue of an activating agent which is capable of reacting with an acceptor molecule.
    Type: Grant
    Filed: June 3, 1987
    Date of Patent: December 12, 1989
    Assignee: Pall Corporation
    Inventors: Thomas C. Gsell, Richard F. Salinaro, Peter J. Degen
  • Patent number: 4876289
    Abstract: The present invention discloses a hydrophilized porous membrane with a crosslinked hydrophilic polymer, which is composed principally of diacetone acrylamide, held physically on at least a part of the pore walls of a starting porous polyolefin membrane, as well as its production process. This hydrophilized porous polyolefin membrane has long-lasting hydrophilicity and good mechanical strength. Its components are dissolved out only minimally in application.
    Type: Grant
    Filed: July 1, 1988
    Date of Patent: October 24, 1989
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Hajime Itoh, Kazutami Mitani
  • Patent number: RE34296
    Abstract: This invention relates to a process for the preparation of hydrophilic membranes by coagulation of a solution of at least one hydrophobic polymer and at least one hydrophilic polymer in a suitable solvent medium in a coagulation medium. The process according to the invention is characterized in that hydrophilic microfiltration and/or ultrafiltration membranes are prepared by cross-linking the hydrophilic polymer which is present in or on the obtained membrane matrix after the coagulation in an essentially non-swollen state and fixing same as such in or on the polymer matrix. Advantageously the solvents and the undesirable components of the coagulation medium are removed whereby the hydrophilic polymer is converted into an essentially non-swollen state prior to cross-linking. The removal of the undesirable components from the membrane takes place by means of a non-solvent for the hydrophilic polymer according to the invention.
    Type: Grant
    Filed: December 17, 1990
    Date of Patent: June 29, 1993
    Assignee: X-Flow B.V.
    Inventors: Hendrik D. W. Roesink, Cornelis A. Smolders, Marcellinus H. V. Mulder, Dirk M. Koenhen