Rubber Or Synthetic Resin Containing Liquid Patents (Class 264/216)
  • Two-stage process for preparing aromatic polyamide film
    Patent number: 4971744
    Abstract: A process for preparing aromatic polyamide film wherein an aromatic diamine and an aromatic diacidchloride are dissolved in an amide polymerization solvent containing an inorganic salt, a partial polymerization is effected at a low temperature to form an optically anisotropic liquid crystalline prepolymer dope, continuously extruding through a film die under a draw ratio or subjecting to a shear and contacting the prepolymer with a second solvent which is a polymerization accelerating-precipitation solvent to obtain an aromatic polyamide film free of crystal defect layer perpendicular to the film axis and having high strength and a high degree of molecular orientation.
    Type: Grant
    Filed: August 21, 1989
    Date of Patent: November 20, 1990
    Assignee: Kolon Industries, Inc.
    Inventors: Ho J. Park, Moo S. Rhim, Hak M. Kim, Du H. Kim, Seog O. Yoo, Sang H. Kim, Sang B. Park, Ink S. Han, Jong T. Park, Si M. Kim
  • Process for preparing isotropic microporous polysulfone membranes
    Patent number: 4970034
    Abstract: Isotropic microporous polysulfone membranes can be prepared by using a particular combination of casting solution and precipitation solution formulations, and casting conditions. Both hollow fiber and flat membranes can be prepared in this manner. The membranes are skinless and are characterized by uniform porosity throughout the membrane.
    Type: Grant
    Filed: September 23, 1988
    Date of Patent: November 13, 1990
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Ann L. Ly, Chaokang Chu, Thanh D. Nguyen
  • Preparation of thin ceramic sheets
    Patent number: 4966742
    Abstract: Thin, free-standing ceramic precursor tapes are prepared from solutions comprising certain coordination complexes, thus eliminating the use of ceramic powders. The precursor tapes can be calcined to form thin ceramic sheets useful in electronic applications.
    Type: Grant
    Filed: August 20, 1985
    Date of Patent: October 30, 1990
    Inventors: Issam A. Khoury, Robert H. Heistand, II, Iwao Kohatsu
  • Ultrafiltration polyimide membrane and its use for recovery of dewaxing aid
    Patent number: 4963303
    Abstract: Polyimide ultrafiltration membranes made using a single solvent and containing a pore forming agent have been produced and have been found to be useful for recovering dewaxing aid used in dewaxing process.
    Type: Grant
    Filed: December 29, 1989
    Date of Patent: October 16, 1990
    Assignee: Exxon Research & Engineering Company
    Inventor: Bryce P. Anderson
  • Preparation of porous substrates having well defined morphology
    Patent number: 4954381
    Abstract: A membrane of defined pore structure and controlled pore diameter and a method of preparing the membrane which comprises dispersing in a water soluble polymer solution (A) an organic polymer solution (B), the water-soluble polymer solution (A) being a non-solvent for the polymer solution (B), to form micro-spherical droplets of the polymer solution (A) which are enveloped by a solid phase consisting of a coagulated or cross-linked polymer solution (B); evenly casting the dispersion on a flat surface; and evaporating the solvent for the polymer solution (B) to form a microporous membrane comprised of the polymer (B), the porosity, pore size, and void volume of the microporous membrane being a function of the polymer (A) concentration, the microsphere dimensions and the temperature and evaporation rate.
    Type: Grant
    Filed: March 21, 1988
    Date of Patent: September 4, 1990
    Assignee: The Research Foundation of the State University of New York
    Inventors: Israel Cabasso, Moshe Levy
  • Process for manufacture of polymethyl methacrylate sheet with controlled color
    Patent number: 4948546
    Abstract: AB dispersants made by group transfer polymerization aid in controlling color shift during casting of MMA polymer sheet containing color pigments and additives, particularly chain transfer agent and sheet release agent.
    Type: Grant
    Filed: December 2, 1988
    Date of Patent: August 14, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Walter H. Delphin, Clyde S. Hutchins, Robert J. Buchacek
  • Solution processing of rigid chain and ladder polymers
    Patent number: 4945156
    Abstract: Methods of solution processing of rigid chain and ladder polymers to films, coatings, or fibers from isotropic or anisotropic solutions in aprotic organic solvents containing Lewis acids are disclosed.
    Type: Grant
    Filed: December 29, 1988
    Date of Patent: July 31, 1990
    Assignee: Honeywell Inc.
    Inventors: Samson A. Jenekhe, James R. Peterson
  • Method of making a shaped polyester article
    Patent number: 4942005
    Abstract: Disclosed is a method of making shaped articles including a continuous polyester phase having dispersed therein microbeads of cellulose acetate which are at least partially bordered by void space, the microbeads of cellulose acetate being present in an amount of about 10-30% by weight based on the weight of said polyester, said void space occupying about 2-50% by volume of said shaped article. Articles made by this method have excellent physical properties, especially optical properties, and are useful in such applications as paper substitutes, for example.
    Type: Grant
    Filed: June 13, 1988
    Date of Patent: July 17, 1990
    Assignee: Eastman Kodak Company
    Inventors: Mark A. Pollock, William J. Stowell, James J. Krutak
  • Film comprised of at least one monomolecular layer and process for its preparation using a higher alkyl amine
    Patent number: 4939214
    Abstract: A film comprised of at least one monomolecular layer composed essentially of a polyimide having repeating units of the formula: ##STR1## wherein R.sup.1 is a tetravalent organic group and R.sup.2 is a bivalent organic group.
    Type: Grant
    Filed: November 17, 1986
    Date of Patent: July 3, 1990
    Assignees: Mitsubishi Kasei Corporation, Yoshio Imai, Taro Hino
    Inventors: Yoshio Imai, Taro Hino, Mitsumasa Iwamoto, Masa-aki Kakimoto, Masa-aki Suzuki, Toru Konishi
  • Process of making oriented films of conductive polymers
    Patent number: 4935181
    Abstract: Methods for preparing highly conductive, oriented polymers are disclosed. In the preferred embodiment, solution of conductive polymer is cast onto the surface of a stretchable support material, and oriented polymer is produced by removing solvent from the solution and stretching the support material. The invention is particularly useful for preparing oriented films of polyaniline which films have been shown to exhibit conductivities in the range of 300-2500 S/cm.
    Type: Grant
    Filed: February 3, 1989
    Date of Patent: June 19, 1990
    Assignee: Trustess of the University of Pennsylvania
    Inventors: Nicolas Theophilou, Sanjeev Manohar, Elliot Scherr
  • Method for preparing radiation resistant polypropylene articles
    Patent number: 4931230
    Abstract: Irradiated polypropylene articles of non-crystalline mesomorphous polypropylene and a method for preparing the articles are provided. The articles are irradiated with a sterilizing dosage of ionizing radiation. The irradiated articles such as films and blown microfiber webs are substantially undegraded after storage periods of as long as six months.
    Type: Grant
    Filed: January 24, 1989
    Date of Patent: June 5, 1990
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Dennis L. Krueger, Thomas I. Insley, Daniel E. Meyer, Richard J. Rolando
  • Method for the manufacture of flat permeable membrane
    Patent number: 4927576
    Abstract: A method of manufacture of flat permeable membrane comprises the steps of mixing a polyolefin, an organic filler uniformly dispersible in the polyolefin in the molten state, and crystal seed forming agent for the polyolefin; discharging the resultant mixture in the molten state through a die; bringing one surface of the discharged molten membrane into contact with a cooling roll; placine the cooled and solidified flat membrane into contact with an extractant capable of dissolving and extracting the organic filler and capable of dissolving the polyolefin; and subjecting the cooled and solidified flat membrane in a fixed state in longitudinal and lateral directions to a heat treatment at a temperature 20.degree. to 50.degree. C. lower than the melting point of the polyolefin.
    Type: Grant
    Filed: January 21, 1988
    Date of Patent: May 22, 1990
    Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
    Inventors: Yukio Seita, Makoto Emi
  • Fabrication of high performance polybenzimidazole films
    Patent number: 4927909
    Abstract: The instant invention involves a process for producing continuous polybenzimidazole films. The process is comprised of the following steps:(a) preparing a solvent solution of a polybenzimidazole polymer;(b) continuously casting the solution upon a support;(c) evaporating a sufficient amount of the solvent to form a self-supporting film in an oven;(d) washing the film in a nonsolvent;(e) removing the film from the support; and(f) continuously collecting the continuous film.
    Type: Grant
    Filed: September 18, 1987
    Date of Patent: May 22, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: Lachhman Wadhwa, Michel Bitritto, Edward J. Powers
  • Method for making a thin film of polymer
    Patent number: 4925612
    Abstract: A method for making a polymer thin film wherein a first polymer thin film is formed on a support liquid, on which a solution of a second polymer is dropped is described. The first polymer film is pulled in opposite directions to break the first polymer film as a slit, from which the second polymer solution is cast on the support liquid. As a result, the solution can spread uniformly without involving any appreciable irregularity in thickness of a final film product.
    Type: Grant
    Filed: September 5, 1989
    Date of Patent: May 15, 1990
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Katsunori Waragai, Yukihiro Saito, Shiro Asakawa
  • Method of manufacturing laminate product
    Patent number: 4917844
    Abstract: When a laminate product is manufactured by extruding a thermoplastic resin on a substrate for coating, a space enclosed between a member for cooling the thermoplastic resin and a non-cooled thermoplastic resin film is kept within an atmosphere having a high permeability with respect to the thermoplastic resin film. Occurrence of craters in the laminated resin film is reduced.
    Type: Grant
    Filed: March 31, 1988
    Date of Patent: April 17, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Toshiya Komai, Sei Kawahara, Mitsuhiro Ikeda
  • Process and apparatus for cooling a molten film extruded from a slot die into a cooling system
    Patent number: 4911874
    Abstract: A molten film extruded from a slot die onto a take-off drum in a cooling system is first cooled on the circumferential surface of the take-off drum and by the ambient air, is subsequently passed into the water bath of a water trough in which the take-off drum is immersed, and finally is transferred from the water bath of the water trough into a post-cooling water bath, in which the film solidifies to an intermediate film having a desired final temperature of approximately 40.degree. C. When the film leaves the take-off drum, the partially solidified molten film has a mean temperature T.sub.u of between 100.degree. C. and 120.degree. C. For optimization of the dwell time of the molten film in the cooling system and in the post-cooling water bath, the drum diameter D of the take-off drum and the length L of the post-cooling water bath are determined by a specific relationship.
    Type: Grant
    Filed: February 15, 1989
    Date of Patent: March 27, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Herbert Peiffer, Guenther Crass, Wolfgang Dietz
  • Langmuir-Blodgett films of polymers having pendent C.sub.10 -C.sub.30 hydrocarbon groups
    Patent number: 4910293
    Abstract: An amphiphilic high polymer comprises a linear recurring unit containing at least divalent organic group (R.sub.1) having at least two carbon atoms, at least divalent organic group (R.sub.2) having at least two carbon atoms, and at least one C.sub.10-30 hydrocarbon-containing group (R.sub.3) which may have one or more substituent groups, said organic groups R.sub.1 and R.sub.2 being connected to each other by a divalent connecting group, and said hydrocarbon-containing group R.sub.3 being boned to said recurring unit by a covalent bond, and the method for producing the same comprises polycondensating a combination of monomers containing R.sub.1 and R.sub.2.
    Type: Grant
    Filed: October 11, 1988
    Date of Patent: March 20, 1990
    Assignee: Kanegafuchi Kagaku Kogyo Kabushiki Kaisha
    Inventors: Masakazu Uekita, Hiroshi Awaji
  • Ultrafiltration polyamide membrane and its use for recovery of dewaxing aid (OP-3454)
    Patent number: 4908134
    Abstract: Polyimide ultrafiltration membranes made using a single solvent and containing a pore forming agent have been produced and have been found to be useful for recovering dewaxing aid used in dewaxing process.
    Type: Grant
    Filed: February 16, 1989
    Date of Patent: March 13, 1990
    Assignee: Exxon Research and Engineering Company
    Inventor: Bryce P. Anderson
  • Apparatus for cooling a melt strip of thermoplastic synthetic resin and process
    Patent number: 4908165
    Abstract: An apparatus and method for cooling a melt strip from a wide-slot die includes a cooling roller driven at a predetermined angular velocity and juxtaposed with a corona-discharge electrode in the form of a rotation symmetrical rigid bar which is rotated about its axis at an angular velocity much greater than that of the cooling roller. The rotating corona-discharge electrode can be received in a nonrotatable insulating chamber having air inlets on a side opposite a slot-shaped outlet training ionized air onto the melt strip.
    Type: Grant
    Filed: October 17, 1988
    Date of Patent: March 13, 1990
    Assignee: Reifenhauser GmbH & Co., Maschinenfabrik
    Inventors: Walter Kramer, Klemens Krumm, Hans D. Ott
  • Method of casting a porous membrane of polymeric material
    Patent number: 4898698
    Abstract: A method of casting porous membranes of polymeric material is provided wherein the membrane has at least one of the following: a more homogeneous active skin layer for separation purposes with a lower molecular weight cut off, a more homogeneous active skin layer with a sharper molecular weight cut off curve, a relatively thinner active skin layer with a relatively greater flux for a given separation of a substance from a solution thereof, and relatively fewer imperfections through the active skin layer.
    Type: Grant
    Filed: December 7, 1988
    Date of Patent: February 6, 1990
    Assignee: National Research Concil of Canada
    Inventors: Thomas A. Tweedle, Oleh Kutowy, Andre Tremblay
  • Process for preparing heat treated solution cast polyketone-based barrier polymer materials
    Patent number: 4895689
    Abstract: A process for preparing a polymer material having improved oxygen and carbon dioxide barrier properties wherein a heated solution cast film, of a linear alternating polymer of carbon dioxide and at least one ethylenically unsaturated hydrocarbon, is cooled at a selected rate.
    Type: Grant
    Filed: December 4, 1987
    Date of Patent: January 23, 1990
    Assignee: Shell Oil Company
    Inventor: Leonard E. Gerlowski
  • Method of producing a support for photographic paper
    Patent number: 4895688
    Abstract: A support for photographic paper is produced by a method including the steps of coating one or two surfaces of a substrate sheet with a resinous melt includes a water-proof thermoplastic polymer and a pigment, by a melt-extrude-coating method, and solidifying the coating layer of the resinous melt on the substrate sheet, and wherein at least one melt-kneading procedure is applied to the resinous melt in a melt extruder having a pair of biaxial screws engaged with each other and satisfying the relationship (i)L.gtoreq.20D (I)wherein L is a length of the screws and D is a diameter of the screws, and provided with at least one pair of kneading disks located in at least a portion of the screws.
    Type: Grant
    Filed: October 24, 1988
    Date of Patent: January 23, 1990
    Assignee: Oji Paper Co., Ltd.
    Inventors: Tsunehisa Shigetani, Masahiro Kamiya, Tatsuo Miyakoda, Katsuhiko Sakata, Toshio Inada, Tatsumi Okada
  • Apparatus for the continuous production of polymers and copolymers of water-soluble monomers
    Patent number: 4893999
    Abstract: The present invention relates to an apparatus for the continuous production of polymers and copolymers of water-soluble monomers particularly acrylic acid and/or methacrylic acid, optionally with additional comonomers, by the polymerization of an aqueous monomer solution that is introduced into the trough that is formed by an endless conveyor belt. The trough-like shape of the conveyor belt changes continuously into an extended flat profile during the polymerization process; starting from the side edges and working towards the center of the trough formed by the conveyor belt, the resulting polymer gel strand is released continuously during the transition of the curved trough-like shape of the conveyor belt into the extended, flat form.
    Type: Grant
    Filed: September 24, 1987
    Date of Patent: January 16, 1990
    Assignee: Chemische Fabrik Stockhausen GmbH
    Inventors: Miroslav Chmelir, Josef Pauen
  • Process for making multilayered, formable laminates
    Patent number: 4892700
    Abstract: A process for making a multilayered formable plastic composite laminate and a process for its manufacture which includes preparing an acrylic composition which includes the reaction product of a mixture of predominantly an acrylic monomer and a substantially lesser amount of a polymer thereof, at least one free radical reaction initiating reaction catalyst, and optionally, a chain length regulating agent or a cross-linking agent; deaerating the acrylic composition; casting the deaerated acrylic composition upon a sheet or laminate of a thermoplastic material; and curing the cast acrylic composition in several successive stages so as to substantially polymerize the acrylic monomer and to permit penetration of the acrylic composition preferably to a depth of between about 0.001-0.
    Type: Grant
    Filed: October 7, 1987
    Date of Patent: January 9, 1990
    Assignee: Polycast Technology Corporation
    Inventors: Carlos Guerra, John Lee, Mark Johnson
  • Manufacture of flexible sheet material
    Patent number: 4883551
    Abstract: A plurality of strands is introduced by a reciprocating weft laying device into a layer of paste-like bonding material deposited on the upper surface of an endless belt. A plurality of warp strands extending in the warp direction is introduced into the paste over the first mentioned strands. A second plurality of strands in the weft direction is similarly introduced by means of a second reciprocating weft laying device and a second plurality of strands in the warp direction is introduced over these second weft strands. The paste-like bonding material is then cured by a heated roller to produce the finished material. Material may be made having only one set of warp strands and one set of weft strands or more than two sets each of warp and weft strands.
    Type: Grant
    Filed: May 26, 1987
    Date of Patent: November 28, 1989
    Assignee: Courtaulds PLC
    Inventor: Arthur Britton
  • Method for manufacture of cast fluoropolymer-containing films at high productivity
    Patent number: 4883716
    Abstract: A method is provided for preparation of a fluoropolymeric film on a carrier, comprising:(a) preparing an aqueous dispersion comprising a fluoropolymer;(b) dipping a carrier belt through the dispersion such that a coating of the dispersion is formed on the carrier belt;(c) passing the coated carrier belt through a metering zone to remove excess dispersion;(d) drying the metered coated carrier to remove the water from the dispersion; and(e) heating the dried coated carrier to a temperature sufficient to consolidate the dispersion, wherein the carrier belt is formed from a material of low thermal mass having chemical and dimensional stability at the consolidation temperature of the dispersion and a work of adhesion between the carrier belt and the dispersion that does not exceed the yield strength of the consolidated fluoropolymeric film.
    Type: Grant
    Filed: August 1, 1988
    Date of Patent: November 28, 1989
    Assignee: Chemical Fabrics Corporation
    Inventors: John A. Effenberger, Keith G. Koerber, Michael N. Latorra, John V. Petriello
  • Process of making a non-oriented, surface-roughened film or sheet
    Patent number: 4880589
    Abstract: A process for production of an essentially non-oriented surface-roughened film or sheet comprising a crystalline homopolymer or crystalline copolymer of 4-methyl-1-pentene having a surface roughness of 0.5 to 10 micrometers, said process including the following steps (1) preparing a molten composition comprising a homopolymer or copolymer of 4-methyl-1-pentene, (2) extruding the molten composition to form a film or sheet, and (3) placing the film or sheet in contact with a roller having a roughened surface or passing the film or sheet through a pair of rollers, at least one of which has a roughened surface; and the use of the above-mentioned surface roughened film or sheet for the manufacture of single-sided metal clad laminates.
    Type: Grant
    Filed: June 21, 1988
    Date of Patent: November 14, 1989
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Hiromi Shigemoto, Shunji Abe, Akio Yamamoto
  • Apparatus for calendering plastic web extruded from a slot die
    Patent number: 4874571
    Abstract: The invention relates to an apparatus for calendering a plastic web extruded from a slot die, and a method of operating this apparatus, the apparatus having at least two cooled rolls, which work in conjunction, the plastic web passing through the calendering nip between them. The plastic is particularly a partly crystalline type, notably polypropylene. The slot die is arranged above the first nip, and the plastic web passing through the nip continuously comes off the first roll and passes around the second roll at about 180.degree. or more. Below the nip there is a blowing device for causing cooling gas to impinges along the entire width of the plastic web in the channel between the first roll and the plastic web coming off it.
    Type: Grant
    Filed: January 11, 1988
    Date of Patent: October 17, 1989
    Assignee: Reifenhauser GmbH & Co. Maschinenfabrik
    Inventor: Heinz Muller
  • Process for reducing draw resonance by heating film after extrusion
    Patent number: 4859379
    Abstract: Films such as LLDPE extruded through a slot-die and drawn under high Deborah number conditions behave like elastic solids and exhibit draw resonance which is alleviated by heating the film after it exits the extruder, e.g., with radiant heaters.
    Type: Grant
    Filed: December 30, 1987
    Date of Patent: August 22, 1989
    Assignee: Mobil Oil Corporation
    Inventor: Alan W. Chiang
  • Poly-p-phenylene-terephthalamide film and process for producing the same
    Patent number: 4857255
    Abstract: There is presented a poly-p-phenylene-terephthalamide film which is excellent in transparency, sufficiently oriented not only in the MD direction but also in the TD direction of the film having strength, elongation, modulus and dimensional stability in both longitudinal and lateral directions, and is also excellent in flatness. The film can be produced by forming an optically anisotropic dope comprising a poly-p-phenyleneterephthalamide having an .eta.inh of 2.5 dl/g or higher and an inorganic strong acid type solvent into a film-shaped dope on a support surface, converting the dope into an optically isotropic dope by water absorption, coagulating the dope, then washing the coagulated product and drying while restricting it shrinkage.
    Type: Grant
    Filed: October 2, 1987
    Date of Patent: August 15, 1989
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Taichi Imanishi, Shigemitsu Muraoka
  • Delivery system of strippable extrusion coated films for medical applications
    Patent number: 4854995
    Abstract: The present invention provides a process for producing a wound dressing delivery system. The wound dressing delivery system is formed by extruding first and second thermoplastic resins onto the surface of a carrier sheet to form first and second thermoplastic films; the first thermoplastic film functions as a temporary support for the second thermoplastic film and the second thermoplastic film functions as a wound dressing and has a moisture vapor transmission rate of greater than 300 grams/square meter/24 hours (ASTM E-96:37.8.degree. C./90% R.H.). The first thermpolastic resin is extruded onto the surface of the carrier sheet and the second thermoplastic resin is extruded onto the surface of the first thermoplastic film such that the first thermoplastic film is interposed between the carrier sheet and the second thermoplastic film.
    Type: Grant
    Filed: September 9, 1987
    Date of Patent: August 8, 1989
    Assignee: Bertek, Inc.
    Inventors: Klaus B. Kasper, Tom Yip
  • Oriented polymer films, a process for the preparation thereof
    Patent number: 4851173
    Abstract: A process for the continuous preparation of an oriented film of a polymer material comprising shearing at least one film of a solution and/or gel of the polymer material between at least one set of two solid surfaces which are in motion relative to one another. At least one of which surfaces is endless, so as to cause by the shearing, solidification of the polymer material from the solution or gel to a degree sufficient that a coherent, oriented film of the polymer material is formed on one of the surfaces. The film is sufficiently coherent so as to be capable of being removed from the surface on which it is formed in a continuous manner.
    Type: Grant
    Filed: May 20, 1986
    Date of Patent: July 25, 1989
    Assignee: National Research Development Corporation
    Inventors: Malcolm R. Mackley, Gary S. Sapsford
  • Method of constructing a blood flow conduit
    Patent number: 4840690
    Abstract: A method of constructing a blood flow conduit provided with external inflatable balloons and having rigid end portions for facilitating insertion into blood vessels and means for detecting pulsatile flow in the conduit and excessive pressure in the balloons.
    Type: Grant
    Filed: March 10, 1988
    Date of Patent: June 20, 1989
    Assignee: Becton, Dickinson and Company
    Inventors: Lev A. Melinyshyn, Jeffrey M. Stupar, Edward M. Goldberg
  • Methods for fabricating a low dimensionally electroconductive article
    Patent number: 4839112
    Abstract: Methods for fabricating low dimensionally electroconductive articles comprising cofacially stacking organomacrocycles and as cofacially stacking phthalocyanines, in which a composition comprising a cofacially stacking phthalocyanine in strong Bronsted acid is formed into a desired shape such as a fiber or film, solidified by removal of the solvent, and provided in fractional valence state.
    Type: Grant
    Filed: October 8, 1986
    Date of Patent: June 13, 1989
    Assignee: Northwestern University
    Inventors: Kenneth J. Wynne, Tobin J. Marks, Tamotsu Inabe
  • Process for preparation of light-diffusing methacrylic resin plates
    Patent number: 4839125
    Abstract: Light-diffusing methacrylic plates are continuously prepared by casting a polymerizable material composed of methyl methacrylate or a partially polymerized product thereof with 0.2 to 3.0% by weight of a light diffusing material between two belts. The belts are separated by an average distance l but are capable of both compression and expansion relative to this average separation. The method involves applying compression at at least one point in the casting space to reduce the separation distance and then allowing expansion back to a maximum distance wherein the maximum spacing between the belts is from (l+1) mm to (l+0.2) mm and the minimum spacing during compression is from (l-1) mm to (l-0.2) mm.
    Type: Grant
    Filed: May 12, 1987
    Date of Patent: June 13, 1989
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventor: Kozo Ida
  • Soft playing orthopedic splint
    Patent number: 4829992
    Abstract: Soft orthopedic splint comprising an inner layer of RTV silicone rubber impregnated gauze and an outer layer of silicone rubber impregnated gauze with a soft foam pad interposed between. The soft pad has spaced edges which define a seam area to be filled by the rubbery compound. The pad is also provided with openings into which the rubber exudes before vulcanizing so that the intermediate pad is locked or keyed in place without using cement. The splint is split along the seam so that the split edges are entirely rubber surfaces covering the pad. The ends of the pad are also covered by rubber.
    Type: Grant
    Filed: October 1, 1987
    Date of Patent: May 16, 1989
    Inventors: David R. Cilladi, Jeffrey C. Sunderlin, Steven R. Tippett, Patrick B. Karns
  • Method and device for the manufacture of a high optical quality transparent sheet or plastic
    Patent number: 4830806
    Abstract: The invention is directed to the method, products and apparatus for the manufacture of a high optical quality sheet of plastic comprising a polyurethane layer having energy-absorbing properties obtained by reactive pouring or reactive pulverization of the reaction components.In accordance with the invention, the polyurethane layer is treated, while it is in a state of ongoing polymerization corresponding to an NCO/CH ratio of less than 0.7, with water in a liquid or vapor form and then subsequently, after rolling with an interpolated film, stocking and unrolling, the layer is subjected to heat treatment.
    Type: Grant
    Filed: June 24, 1987
    Date of Patent: May 16, 1989
    Assignee: Saint-Gobain Vitrage
    Inventors: Gerard Daude, Jean-Louis Bravet, Michel Moncheaux, Sylvie Drujon, Gerard Dimier
  • Coating method
    Patent number: 4828779
    Abstract: A method for uniformly coating a moving substrate by eliminating nonuniformities in the voscosity of the coating solution along the line where the solution is applied to the substrate. A viscosity-varying region is provided either inside or outside of a coating solution pocket in an extruder assembly. In one embodiment, the voscosity-varying region is provided by making the length of a slit through which the coating solution flows onto the support less than that of the pocket. In another embodiment, the viscosity-varying region takes the form of small-diameter tube through which the coating solution is supplied to one end of the pocket. In a third embodiment, a roller is disposed in the pocket and the diameter of the roller and the pocket are tapered towards the center. In a still further embodiment, the solution is supplied through a distributor.
    Type: Grant
    Filed: October 20, 1986
    Date of Patent: May 9, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yasuhito Hiraki, Yasunori Tanaka, Shinji Noda
  • Method for continuous injection molding
    Patent number: 4828778
    Abstract: A method for continuous injection molding of thermoplastic materiall into three-dimensional sheets having a projection extending from a substantially uniform backing layer. An extrusion die having a face matching the surface of a rotatable mold drum with cavities therein provides molten thermoplastic material simultaneously into the cavities to form the projections and onto the surface to form the backing layer.
    Type: Grant
    Filed: May 29, 1985
    Date of Patent: May 9, 1989
    Assignee: Monsanto Company
    Inventors: Lawrence J. Gelsomini, William R. Mueller
  • Process for the preparation of cast film
    Patent number: 4808359
    Abstract: Cast film on the basis of low-density polyethylene is prepared by extruding the molten polymer at temperatures of the melt at the die gap of below 200.degree. C. Films that have been prepared this way have special mono-axial orientation as a result of which the mechanical properties are improved.
    Type: Grant
    Filed: July 30, 1986
    Date of Patent: February 28, 1989
    Assignee: Stamicarbon B.V.
    Inventor: Theodorus J. van der Molen
  • Polyketone membranes
    Patent number: 4804472
    Abstract: A separation membrane having cell sizes in the range of 0.1 to 10 microns, prepared by:mixing at least one linear alternating polymer of carbon monoxide and at least one ethylenically unsaturated hydrogen in a solvent forming a solution;casting said solution on a substance, andremoving at least a portion of said solvent.
    Type: Grant
    Filed: December 30, 1987
    Date of Patent: February 14, 1989
    Assignee: Shell Oil Company
    Inventor: Dale L. Handlin, Jr.
  • Process for preparation of acrylic resin sheets having excellent moldability and solvent resistance
    Patent number: 4803026
    Abstract: Acrylic resin sheets having an excellent heat moldability and solvent resistance are prepared by:(1) preparing a syrup of methyl methacrylate or a monomer mixture comprising at least 60 weight % of methyl methacrylate and not more than 40 weight % of an acrylic acid ester by partially polymerizing the monomer or monomers in the presence of 0.01 to 2.0 weight %, based on the monomer or monomers, of a chain transfer agent, as well as a polymerization initiator; and(2) incorporating the thus-prepared syrup with 0.02 to 1.0 weight %, based on the syrup, of a cross-linking agent, and subjecting the resulting mixture of cast polymerization under such conditions that if the crosslinking agent is not present, the intrinsic viscosity of the completely polymerized sheet is in the range of 0.05 to 0.12 l/g.
    Type: Grant
    Filed: October 3, 1986
    Date of Patent: February 7, 1989
    Assignee: Mitsubishi Rayon Company, Ltd.
    Inventors: Hiroyuki Ikeda, Yukihiro Matsumoto, Koyu Nishimura
  • Process for the production of biaxially stretched films and apparatus for implementation of the process
    Patent number: 4803027
    Abstract: In the process for the production of thin, biaxially stretched films from polypropylene, the latter is melted in an extruder and extruded from a slot die over the surface of a take-off roll. The plastic melt cooled on the surface of the take-off roll into an intermediate film is temperature-treated in the region of the take-off roll in a zone and the intermediate film is subsequently biaxially stretched and heat-set in a known way. At a take-off roll temperature T.sub.W of between 10.degree. C. and 100.degree. C., blowing air of a temperature T.sub.L greater than/equal to 30.degree. C. is blown onto the film surface on the air side not in contact with the circumferential surface of the take-off roll, the duration for this temperature treatment being at least 1.5 seconds.
    Type: Grant
    Filed: June 9, 1987
    Date of Patent: February 7, 1989
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Herbert Peiffer, Guenther Crass, Wolfgang Dietz, Gunter Schloegl
  • Process for the preparation of polyimide film
    Patent number: 4797307
    Abstract: A process for the production of a polyimide film having an increased adhesiveness which includes the steps of: evenly coating a surface treating solution which contains a heat-resistant surface treating agent of aminosilane type, epoxysilane type or titanate type in an amount not less than 0.5 wt. % on a surface of a solid film comprising an aromatic polymer composition which contains 100 parts by weight of an aromatic polyamic acid and 5-150 parts by weight of an organic polar solvent and heating the solid film having the coated surface treating solution at a temperature of 100.degree.-600.degree. C., to imidize the polyamic acid constituting the solid film as well as to dry the film.
    Type: Grant
    Filed: May 14, 1987
    Date of Patent: January 10, 1989
    Assignee: Ube Industries, Ltd.
    Inventors: Akihiro Kunimoto, Seiichiro Takabayashi, Yuji Matsui
  • Vacuum pinning process
    Patent number: 4783304
    Abstract: A process improvement for preparing thermoplastic polymeric film, preferably of polyethylene terephthalate, by extruding a web in melt form onto a quench drum with a surface roughness of at least 3 microinches. In casting webs of less than about 5 mils in thickness the improvement involves drawing the melt to a melt drawdown ratio of less than about 25 and spacing the die lips from the quench roll at less than about 120 mils, preferably 20 to 80 mils. It is also preferred that the flow stability index be greater than 5.
    Type: Grant
    Filed: June 17, 1987
    Date of Patent: November 8, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: David E. Heyer
  • Linear low density polyethylene cast film
    Patent number: 4780264
    Abstract: The draw resonance problems encountered when extrusion casting or extrusion coating linear low density polyethylene, LLDPE, are substantially alleviated by a polymer designed to have an I.sub.2 value in the range of about 0.1 to about 25, and an I.sub.10 /I.sub.2 ratio of not more than 8.3, preferably lower than 8.3. Line speeds approaching and even surpassing those attained with LDPE are made possible. This invention can even be used in conjunction with known prior methods for alleviating draw resonance problems with LLDPE and obtain the benefits of the combination. The I.sub.2 is measured in accordance with ASTM D-1238-190/2.16 and the I.sub.10 is measured in accordance with ASTM D-1238-190/10.
    Type: Grant
    Filed: May 22, 1987
    Date of Patent: October 25, 1988
    Assignee: The Dow Chemical Company
    Inventors: Kathryn K. Dohrer, Debra H. Niemann
  • Method for production of porous membrane
    Patent number: 4772440
    Abstract: In a method for the manufacture of a porous membrane by the steps of causing a polymer solution to flow and spread in a uniform thickness on a substrate and solidifying the formed layer of the polymer solution in a bad solvent, the improvement which comprises using a fluorinated hydrocarbon as the bad solvent and optionally carrying out the removal of a good solvent mingling into the fluorinated hydrocarbon during the course of the solidification by the technique of extraction from water, and repeating the fluorinated hydrocarbon.
    Type: Grant
    Filed: November 12, 1986
    Date of Patent: September 20, 1988
    Assignee: Terumo Kabushiki Kaisha T/A Terumo Corp.
    Inventors: Masaaki Kasi, Noriyuki Koyama
  • Process for producing polyphenylene sulfide film
    Patent number: 4769190
    Abstract: Disclosed herein is a process for producing a polyphenylene sulfide film, which comprises melt-molding polyphenylene sulfides in a sheet-like form from a die, casting the thus obtained sheet-like form onto a chilled drum on which an adhering liquid has been applied, while closely contacting the sheet-like form with the chilled drum surface by an electrostatic pinning method.
    Type: Grant
    Filed: April 23, 1987
    Date of Patent: September 6, 1988
    Assignee: Diafoil Company, Limited
    Inventors: Shigeo Utsumi, Yujiro Fukuda, Yoshinori Sato, Narihiro Masuda
  • Process of making a conveyor belt
    Patent number: 4769202
    Abstract: An apparatus and method for producing a conveyor belt made of urethane having reinforcement embedded therein which reinforcement permits the stretching of the belt under controlled conditions. The reinforcement consists of a fabric or a plurality of aligned strands that are embedded in the urethane body of the belt proper that allow for a controlled stretch in the conveyor belt until such fabric or cords limit the stretching of such belt.
    Type: Grant
    Filed: July 7, 1987
    Date of Patent: September 6, 1988
    Assignee: The B. F. Goodrich Company
    Inventors: Richard E. Eroskey, Winthrop S. Worcester
  • Novel membranes and process for making them
    Patent number: 4761233
    Abstract: A process for preparing a microporous membrane, which comprises casting the membrane from a solution comprising a mixture of at least one pore-forming polymer and at least one film-forming polymer, and a solvent for the mixture of polymers, wherein the at least one pore-forming polymer is one which if cast alone would contract to form either large pores or a non-uniform distribution of material.
    Type: Grant
    Filed: March 10, 1987
    Date of Patent: August 2, 1988
    Assignee: Membrane Products Kiryat Weizmann Ltd.
    Inventors: Charles Linder, Mordechay Perry, Reuven Ketraro