Utilizing Release Agent In Molding Material Patents (Class 264/300)
  • Patent number: 5536465
    Abstract: The present invention relates to a process for the preparation of a SRIM molded product wherein the mold cavity has minimum dimensions of 1000 mm.times.100 mm.times.3.5 mm. The reaction mixture contains an isocyanate component and an isocyanate reactive component at an isocyanate index of from about 90 to about 400. The reinforcing fiber mat is present in an amount of from 50 to 65% by weight, based on the combined weight of the reaction mixture and the reinforcing fiber mat. In particular, the isocyanate component is 1) a polymethylene poly(phenyl isocyanate) having an isocyanate group content of from 25 to 40% by weight, and a diisocyanate content of 45-55% by weight; and 2) the isocyanate-reactive component comprises a) from about 1 to 15% by weight, based on the total weight of the isocyanate reactive component, of a fatty acid, b) from about 0.5 to 10% by weight, based on the total weight of the isocyanate-reactive component, of a zinc-carboxylate, and c) a polyol component.
    Type: Grant
    Filed: December 7, 1994
    Date of Patent: July 16, 1996
    Assignee: Bayer Corporation
    Inventor: Merle W. Lesko
  • Patent number: 5529739
    Abstract: The present invention is directed to an improved internal mold release system for the production of high density molded SRIM parts, i.e. molded parts having a density of from 1.3 to 2.0 g/cc. In particular, the process involves reacting a reaction mixture comprising an organic polyisocyanate and at least one organic compound containing isocyanate-reactive hydrogens in the presence of a catalyst and an internal mold release agent in a closed mold. The internal mold release agent is a compound corresponding to the formula: ##STR1## wherein R.sup.2 represents hydrogen, the group R.sup.5 --NH--CO--, or a C.sub.1 to C.sub.24 alkyl or substituted alkyl group, a C.sub.3 to C.sub.24 cycloalkyl or substituted cycloalkyl group, a C.sub.2 to C.sub.24 alkenyl or substituted alkenyl group, or a C.sub.6 to C.sub.24 aryl or substituted aryl group, andwherein R.sup.1, R.sup.3, R.sup.4 and R.sup.5 may be the same or different and represent a C.sub.1 to C.sub.24 alkyl or substituted alkyl group, a C.sub.3 to C.sub.
    Type: Grant
    Filed: November 15, 1994
    Date of Patent: June 25, 1996
    Assignee: Bayer Corporation
    Inventors: Erik H. Jonsson, Harald Pielartzik, Kristen L. Parks, Randall C. Rains
  • Patent number: 5500176
    Abstract: The present invention is directed to an improved internal mold release system for the production of high density molded SRIM parts, i.e. molded parts having a density of from 1.3 to 2.0 g/cc. In particular, the process includes reacting a reaction mixture including an organic polyisocyanate and at least one organic compound containing isocyanate-reactive hydrogens in the presence of a catalyst and an internal mold release agent in a closed mold. The internal mold release agent includes:a) mixed esters including the reaction product of i) aliphatic dicarboxylic acids, ii) aliphatic polyols, and iii) monocarboxylic acids with 12 to 30 carbon atoms in the molecule.The reaction mixture may additionally include a fatty acid such as, for example, oleic acid.
    Type: Grant
    Filed: July 14, 1994
    Date of Patent: March 19, 1996
    Assignee: Bayer Corporation
    Inventors: Kristen L. Parks, Richard W. Mitesser, Merle W. Lesko
  • Patent number: 5486322
    Abstract: Method of making a multilayer protective covering such as a surgical glove, finger cot or condom. Mold with a first layer is dipped into a gas-releasing solution which comprises a release agent, a blowing agent, and/or a coagulant. The mold is then dipped into a layer-forming solution to form a second layer. Heat is applied and gas forms between the layers, separating the layers. An antimicrobial solution may replace gas between the layers.
    Type: Grant
    Filed: October 1, 1993
    Date of Patent: January 23, 1996
    Assignee: Board of Regents, The University of Texas System
    Inventor: Ingbert E. Fuchs
  • Patent number: 5468432
    Abstract: This invention relates to a reaction injection molding process for preparing a molded product by reaction of a mixture of(a) an organic polyisocyanate;(b) one or more compounds containing at least two isocyanate-reactive groups;(c) about 2 to about 20% by weight, based on the weight of the molded product, of rigid fibers having a diameter of from about 5 to about 10 micrometers and a length ranging from the diameter of the fiber up to about 2 millimeters, preferably in admixture with component (b);and, optionally,(d) an inert gas dissolved in at least one of components (a) or (b) in an amount sufficient to produce a molded product having a density of at least 0.80 g/cm.sup.3 ; and(e) up to 15% by weight, based upon the weight of the molded product, of a filler other than rigid fibers (c).
    Type: Grant
    Filed: April 4, 1995
    Date of Patent: November 21, 1995
    Assignee: Bayer Corporation
    Inventors: Michael F. Hurley, Clifford J. Lau, Bin Lee
  • Patent number: 5447671
    Abstract: An edging member for a window glass of an automobile door is provided with a plurality of contacting surfaces against which window glass is contacted. Each contacting surface is provided with a rough contacting layer respectively including a synthetic resin prepared by mixing large and small particles or grains of materials having different melting points, such as nylon, urethane, fluoro-resin and polyolefin resin, polystyrene resin and the like. The rough contacting layer is extruded simultaneously with the extrusion molding of the edging member.
    Type: Grant
    Filed: October 28, 1993
    Date of Patent: September 5, 1995
    Assignees: Tokiwa Chemical Industries & Co., Ltd., Masuzawa Chemical Sales, Co., Ltd., System Technical Co., Ltd.
    Inventors: Katsuhisa Kato, Naohisa Miyakawa, Minoru Masuzawa
  • Patent number: 5441685
    Abstract: An edging member of a window glass for an automobile door is provided with a plurality of contacting portions to which the window glass is contacted. Each of the contacting portions is provided with a batten surface layer including a synthetic resin such as nylon, urethane and polyolefin resin, and powders or grains of mica, molybdenum and/or graphite mixed with the synthetic resin. A rough surface having projections and recesses is formed on the front surface of the batten surface layer by extruding the batten surface simultaneously with the extrusion molding of the edging member.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: August 15, 1995
    Assignees: Tokiwa Chemical Industries Co., Ltd., Masuzawa Chemical Sales Co., Ltd., System Technical Co., Ltd.
    Inventors: Naohisa Miyakawa, Minoru Masuzawa, Katsuhisa Kato
  • Patent number: 5414037
    Abstract: A resin transfer molding process for manufacture of class `A` surface vehicle body panels. The process has critical ranges of resin (38%-44%) reinforcement fibers (28%-32%) and a filler material (28%-30%).
    Type: Grant
    Filed: October 25, 1993
    Date of Patent: May 9, 1995
    Assignee: Chrysler Corporation
    Inventors: Nippani R. Rao, Saad M. Abouzahr, Russ Spencer, Denis E. Falkowski
  • Patent number: 5409648
    Abstract: A process is disclosed for producing multiple-layer moulded bodies by injection of a laminate (16) composed of an essentially flexible, foil-like surface material (19) such as leather or textiles, and a foam layer (22) laminated on the back side of the surface material. Before the laminate is introduced in the injection mould, a separating layer (17) is applied on the surface of the foam material. The separating layer is composed of a separating agent that contains a mixture of an aqueous rubber dispersion and a aqueous silicone emulsion.
    Type: Grant
    Filed: April 20, 1993
    Date of Patent: April 25, 1995
    Assignee: Metraplast H. Jung GmbH
    Inventor: Jurgen Reidel
  • Patent number: 5399310
    Abstract: Mold release agents and methods for molding plastics are provided. They are especially applicable to polyurethane-based reaction injection molding (RIM) systems. The mold release agent includes the lithium, sodium, or potassium salt, or a mixture thereof, of an oligomer of monomeric units or a mixture of said oligomers, the monomeric units being selected from the group consisting of carboxylic fatty acids having at least 14 carbon atoms, preferably 14 to 24 carbon atoms, the salt of the oligomer preferably being soluble in water or water/alcohol. Preferably, the Li and Na salts of C.sub.36 and C.sub.44 dicarboxylic fatty acids are used. Preferred embodiments of the present invention permit the use of water without alcohol in the formulation.
    Type: Grant
    Filed: March 23, 1993
    Date of Patent: March 21, 1995
    Assignee: The Dexter Corporation
    Inventors: Jeffrey S. Payne, David L. Martin
  • Patent number: 5381735
    Abstract: Release of a resin mold from a photopolymeric mold is enhanced by using an unsaturated fatty acid ester release agent in the photopolymeric composition. In addition to providing quick release of the resin mold, the incorporation of the unsaturated fatty acid ester improves the flexibility of the photopolymeric mold without sacrificing tensile strength or hardness. The resin mold is used to fabricate rubber plates for ink printing.
    Type: Grant
    Filed: October 26, 1992
    Date of Patent: January 17, 1995
    Assignee: Hercules Incorporated
    Inventor: Charles C. Fifield
  • Patent number: 5381304
    Abstract: An improved encapsulant and method of application for rework of a modular electronic assembly. A housing is provided with a structure that permits deformation with thermal expansion of the encapsulant and reduces stresses applied to the electronic components therewithin. The selected encapsulant provides mechanical stability from shock and vibration, thermal conductivity to the surroundings, and freedom from deterioration of electrical performance. Critically, the encapsulant is readily excised for repair and replacement of defective components, thus allowing rework and salvage of the assembly. A potting tool is adapted for selectively refilling the housing to replace the excised portions.
    Type: Grant
    Filed: June 11, 1993
    Date of Patent: January 10, 1995
    Assignee: Honeywell Inc.
    Inventors: Gil Theroux, Allen G. Baca, Charles H. Hamp, III
  • Patent number: 5376320
    Abstract: To produce rottable thin-walled shaped bodies, such as cups, plates, trays, and the like, which have a high mechanical stability, in a baking process which is similar to that used to produce edible wafers, it is proposed in accordance with the invention to use a substantially fat-free baking composition, which in addition to water contains as a major component a high-starch product, preferably a starch, and as release agents contains fatty acids having chains of medium or long length and/or their salts and/or their acid derivatives. In addition to said compounds or to replace them in part or sometimes entirely it is possible to use polyhydrogensiloxanes. The baking compositions may also contain thickening agents, fillers, humectants, coloring materials, structure-consolidating agents, preservatives and antioxidants. The baked products are finally conditioned to adjust them to a moisture content from 6 to 22% by weight.
    Type: Grant
    Filed: July 30, 1992
    Date of Patent: December 27, 1994
    Assignee: Biopac Biologische Verpackungssysteme Gesellschaft m.b.H.
    Inventors: Karl Tiefenbacher, Franz Haas, Johann Haas
  • Patent number: 5366681
    Abstract: The present invention provides a release agent formed by reacting an organopolysiloxane compound having at least one hydrogen atom with a hydrocarbon compound having at least one double bond which reacts with said hydrogen atom and a manufacturing method thereof. The release agent of this invention, which makes substantially no migration into any pressure sensitive adhesive layer, is well adaptable to whichever process, extrusion laminating process or coating process.
    Type: Grant
    Filed: April 2, 1993
    Date of Patent: November 22, 1994
    Assignee: Goyo Paper Working Co., Ltd.
    Inventors: Shuzo Ohara, Ryoichi Kitamura
  • Patent number: 5318736
    Abstract: Binding compositions for the manufacture of lignocellulosic composites comprising an aqueous emulsion of polyisocyanates and a release agent obtained by reacting a polyisocyanate with an oxyalkylic hemiester of a C.sub.9 -C.sub.18, saturated or unsaturated, monocarboxylic fatty acid.
    Type: Grant
    Filed: December 14, 1992
    Date of Patent: June 7, 1994
    Assignee: Ministro per il Coorinamento dell Iniziative per la Ricerca Scientifica e Technologica
    Inventors: Agostino Lepori, Egidio Moroni
  • Patent number: 5319015
    Abstract: An aqueous release agent for the production of polyurethane moldings and more particularly of polyurethane foam moldings, is provided, which in combination with a release substance contain one or more specific polyvinyl alcohols. As such release substance the release agent preferably contains at least in part one or more unsaturated oligomeric or polymeric hydrocarbons with a molecular weight of at least 500 and iodine numbers of at least 60 optionally in the presence of foam stabilizers suitable for polyurethane systems.
    Type: Grant
    Filed: October 26, 1992
    Date of Patent: June 7, 1994
    Inventors: Manfred Gebhardt, Jiri Beranek, Friedrich Knochel
  • Patent number: 5316716
    Abstract: A mold releasing resin composition is provided which contains at least one fluorinated compound end-blocked with a dimethylhydrogensiloxane group and optionally having a fluorinated polyether linkage. The composition is applied to the inner surface of a silicone rubber mold and cured thereat before a curable resin is admitted into the mold, cured therein, and then removed from the mold.
    Type: Grant
    Filed: June 12, 1992
    Date of Patent: May 31, 1994
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Shinichi Sato, Morio Oohasi, Hiroshi Inomata
  • Patent number: 5308558
    Abstract: A process for producing foamed articles containing thermoplastic aromatic polycarbonates is disclosed. Accordingly, thermoplastic aromatic polycarbonates are mixed with about 0.01 to 10% by weight of Al.sub.2 O.sub.3 (H.sub.2 O).sub.3 and the mixture is either extruded in an extruder at temperatures from 220.degree. C. to 320.degree. C. without application of a vacuum to produce foamed molded articles or it is injection molded in injection molding machines without application of vacuum at temperatures from 290.degree. C. to 330.degree. C. to produce molded foam articles.
    Type: Grant
    Filed: August 13, 1993
    Date of Patent: May 3, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Edwin Woldenberg, Klaus Kircher, Klaus Horn, Johann Piontek, Burkhard Kohler, Wolfgang Ebert
  • Patent number: 5300264
    Abstract: A process for the production of composite bodies consisting of a polyurethane core and a polyurethane covering, with the core being positioned inside a mold so that an average distance of at least 0.5 mm exists between the surface of the core and the internal wall of the mold. The gap between the core and the internal wall of the mold is filled with a reaction mixture composed of a) a polyisocyanate component, and b) a polyol component. The polyol component b) must have a weight ratio of carbon to oxygen of at least 2.5:1.
    Type: Grant
    Filed: September 10, 1992
    Date of Patent: April 5, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Christian Wolfrum, Ulrich Knipp, Peter Schuster, Martin Brock, Ronald Boot
  • Patent number: 5300560
    Abstract: The present invention is directed to the discovery that certain additives of the type described in U.S. Pat. No. 3,726,952 effectively slow down the reaction rate of certain RIM systems based upon aliphatic amine terminated polyethers.
    Type: Grant
    Filed: March 24, 1993
    Date of Patent: April 5, 1994
    Assignee: Miles Inc.
    Inventors: Stephen J. Harasin, Renee M. Hunkele
  • Patent number: 5225125
    Abstract: A lid (1) is injection-molded of polyethylene, for a widemouthed barrel of a synthetic resin, and includes an outer rim (4) encompassing the barrel neck (3) and an inner rim (5) dipping into the barrel neck. The outer lid rim (4) and inner lid rim (5) form an annular space (7), an annular web (8) projecting axially from the base of this space. For producing the lid gasket (13), the annular space (7) is exposed to an open flame for activating the annular space surface. Subsequently the sealing material, preferably polyurethane, is injected from a foaming machine into the base of the annular space (7), and thereafter the lid (1) is vibrated in order to degasify the gasket (13). The sealing material, preferably consisting of foamed polyurethane, contains a parting compound having a long-term effect.
    Type: Grant
    Filed: March 16, 1992
    Date of Patent: July 6, 1993
    Assignee: Schutz-Werke GmbH & Co. KG
    Inventors: Eberhard Wildfeuer, Thomas Erll
  • Patent number: 5213743
    Abstract: The present invention provides a release agent formed by reacting an organopolysiloxane compound having at least one hydrogen atom with a hydrocarbon compound having at least one double bond which reacts with said hydrogen atom and a manufacturing method thereof.The release agent of this invention, which makes substantially no migration into any pressure sensitive adhesive layer, is well adaptable to whichever process, extrusion laminating process or coating process.
    Type: Grant
    Filed: January 17, 1991
    Date of Patent: May 25, 1993
    Assignee: Goyo Paper Working Co., Ltd.
    Inventors: Shuzo Ohara, Ryoichi Kitamura
  • Patent number: 5205976
    Abstract: The method includes mixing (100) degradable consumable cores (11) with a liquid coating composition (20) including an aqueous solvent (21), a hydrosoluble resin (22) and an anti-agglomerant additive (23), drying (200) the coated cores so as to obtain free balls (12) with a substrate film (2), mixing (300) these balls (12) first of all with a liquid covering substance (30) including a synthetic base product (31) and optionally an auxiliary product (32), then with an anti-agglutinant adjuvant (33), drying (400) the covered balls so as to obtain free ball structures (13) with a covering layer (3), and stoving (500) these ball structures so as to harden their covering layer and degrade the cores and thereby obtain hollow spherules (10). Application in the manufacture of intermediate products for producing in particular energy absorbers.
    Type: Grant
    Filed: January 16, 1991
    Date of Patent: April 27, 1993
    Assignee: Ateca RDM
    Inventors: Yves Blottiere, Philippe Chapuis, Mireille Valaud
  • Patent number: 5204034
    Abstract: A process of producing a cleaning blade including a silicon rubber base and a resin layer which acts as a lubricant on the surface of the rubber is produced by molding a rubber material having resin powder dispersed therein at a temperature less than the softening or melting point of the resin, cutting an end of the rubber, and vulcanizing the molded rubber at a temperature higher than the softening or melting point of the resin. The resin layer is selected from polypropylene, polyvinylidene fluoride, polyethylene, or polyester.
    Type: Grant
    Filed: March 21, 1991
    Date of Patent: April 20, 1993
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroshi Sasame, Takeo Shoji, Hiroyuki Adachi, Shinichi Tsukida, Masahiro Watabe, Moriyuki Yanai
  • Patent number: 5182034
    Abstract: Internal mold release compositions for use in preparing molded polymeric products are disclosed which contain (a) a primary or secondary amine, (b) a carboxylic acid or amido carboxylic acid salt of a group II metal or of aluminum, lithium, copper, iron, cobalt or nickel, and optionally (c) a carboxylic acid or amido carboxylic acid.
    Type: Grant
    Filed: October 23, 1989
    Date of Patent: January 26, 1993
    Assignee: The Dow Chemical Company
    Inventors: Louis W. Meyer, J. Alan Vanderhider, Robert Carswell
  • Patent number: 5164143
    Abstract: A process for preparing molded polymeric products including reacting a polyisocyanate with an active hydrogen-containing composition having internal mold release components. In the process, the active hydrogen-containing composition contains (a) a primary or secondary amine, (b) a metal salt of an organic material having a carboxylic acid group and a siloxane chain wherein, said metal is selected from Groups I-B, II-B, IV-B, V-B, VI-B, VII-B or VIII, and optionally (c) an organic material containing at least one carboxylic acid group, phosphorus-containing acid group or boron-containing acid group wherein said organic material contains a siloxane chain or contains a terminal or pendant aliphatic hydrocarbon chain.
    Type: Grant
    Filed: January 30, 1991
    Date of Patent: November 17, 1992
    Assignee: The Dow Chemical Company
    Inventors: Louis W. Meyer, J. Aloan Vanderhider, Robert Carswell
  • Patent number: 5151483
    Abstract: The present invention is directed to a process for producing a molded part by reacting an organic isocyanate with an active hydrogen group-containing material in the presence of a reinforcing fiber mat in a closed mold via the RIM process. The key to the present invention resides in the use of relatively high viscosity components.
    Type: Grant
    Filed: March 13, 1991
    Date of Patent: September 29, 1992
    Assignee: Miles Inc.
    Inventors: Stephen J. Harasin, David F. Sounik, Timothy J. Kelly
  • Patent number: 5128087
    Abstract: The present invention is directed to a process for producing a molded product by a) reacting i) an organic polyisocyanate, ii) an hydroxyl group containing component having an average hydroxyl number of 300 or more, an average hydroxyl functionality of from 2 to 8, and an average molecular weight of no more than about 500, and iii) a carboxylic acid, in a closed mold, b) allowing the components to react, and c) removing the product from the mold.
    Type: Grant
    Filed: April 2, 1991
    Date of Patent: July 7, 1992
    Assignee: Miles Inc.
    Inventors: Gregory H. Slocum, Donald W. Schumacher
  • Patent number: 5124105
    Abstract: In the manufacture of a wax pattern for use in the lost wax casting of a bladed rotor of the radial flow type, the bladed region of a master pattern is enclosed by a curable epoxy resin/aluminium powder composition. Sufficient of the cured resin composition is then machined away so that a plurality of resin composition segments are defined, one segment being interposed between adjacent blades on the master pattern. The segments are then removed from the master pattern and placed in an appropriately configured die member so as to define a complete die for the production of a wax pattern in the form of the master pattern.
    Type: Grant
    Filed: January 29, 1991
    Date of Patent: June 23, 1992
    Assignees: Rolls-Royce plc, Rolls-Royce Business Ventures Limited
    Inventors: James Broughton, Graham J. Marklew, Mark H. Griffiths, Hubert D. Sellars
  • Patent number: 5112543
    Abstract: A method for molding open cell soft polyurethane foam and a release agent utilized in the method are disclosed as incorporating an aqueous gel coated (30) onto interior surfaces (18,20) of a mold (10) prior to introduction of a foamable liquid polyurethane mixture (32) whose foaming fills the mold cavity (22) as the aqueous gel functions as a solventless release agent that has good lubricity to facilitate filling of the cavity by the foam (34), prevents bonding of the foam (34) to the mold and also provides a thin film-like escape passage (36) for gas generated during the foaming. An acrylic acid polymer that is acid neutralized is preferably utilized to provide the aqueous gel. The acrylic acid polymer and acid neutralizer are most preferably sprayed as separate aqueous mixtures onto the interior mold surfaces to provide the aqueous gel.
    Type: Grant
    Filed: December 21, 1989
    Date of Patent: May 12, 1992
    Assignee: Creme Art Corporation
    Inventor: Christian Thary
  • Patent number: 5098627
    Abstract: The present invention relates to a paper releasing guide-claw for a copying machine and a method for producing the same including molding a material containing from about 50-90% by weight of a polyimide consisting essentially of recurring units of the formula: ##STR1## from about 5 to about 40% by weight of a fibrous reinforcing material, and from about 5 to about 30% by weight of a solid lubricant, wherein the sum of the content of the fibrous reinforcing material and the solid lubricant is from about 10 to about 50% by weight, heat treating the molded guide-claw at a temperature of from about 250.degree. C. to about 340.degree. C. for a time sufficient to increase the density of the polyimide component by 1.5%.
    Type: Grant
    Filed: August 30, 1990
    Date of Patent: March 24, 1992
    Assignees: NTN-Rulon Industries Company Ltd., Mitsui Toatsu Chemicals, Inc.
    Inventors: Masao Yoshikawa, Taizo Nagahiro
  • Patent number: 5089200
    Abstract: Process of melt extruding through an extrusion die whose surface is coated with one or more metal oxides, M.sub.x O.sub.y, wherein M is a metal selected from the group consisting of Ti, Zr, Cr, Fe, Ni, Pd, Pt, Cu, Ag, Au, Al and Si, and x and y are selected to satisfy the valencies of M, a difficultly-melt-processible polymer containing 0.002-2 parts by weight, based on the weight of the polymer, of at least one melt-processible fluorocarbon polymer processing aid having a fluorine to carbon ratio of at least 1:2 and having metal oxide-reactive sites capable of reacting with or physically associating with the metal oxide of the die surface.
    Type: Grant
    Filed: September 20, 1990
    Date of Patent: February 18, 1992
    Assignee: E. I. DuPont de Nemours and Company
    Inventors: George R. Chapman, Jr., Rita S. McMinn, Donnan E. Priester, William L. Phillips
  • Patent number: 5076989
    Abstract: The present invention is directed to a mold release, a composition containing the mold release, and a process of using the mold release. The mold release comprises an internal mold release composition comprising(a) a zinc carboxylate containing from 8 to 24 carbon atoms per carboxylate group, and(b) a compatibilizer comprising an amidine group-containing compound of the formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are straight or branched, saturated or unsaturated hydrocarbon chains having up to 30 carbon atoms which may be substituted by ether groups, ester groups, amide groups or amidine groups and may also be terminated by isocyanate-reactive groups such as hydroxyl or amino groups, R.sub.4 corresponds to the definition of R.sub.1, R.sub.2 and R.sub.3, but may additionally represent an aromatic substituent having 6 to 15 carbon atoms or may represent the group --NR.sub.2 R.sub.3, with the proviso that when R.sub.4 represents the group --NR.sub.2 R.sub.3, R.sub.1 can be hydrogen, and wherein R.sub.
    Type: Grant
    Filed: June 28, 1990
    Date of Patent: December 31, 1991
    Assignee: Mobay Corporation
    Inventor: John E. Dewhurst
  • Patent number: 5069965
    Abstract: Rubber and vinyl articles such as gloves with improved slip coatings and processes for their production are provided by coating the outer and/or inner surfaces with either (1) a copolymer of at least one copolymerizable vinyl halide, at least one copolymerizable ethylenically unsaturated hydrocarbon and at least one copolymerizable ethylenically unsaturated monomer containing a carboxyl or amido group, (ii) copolymer of at least one copolymerizable vinyl or vinylidene halide, acrylonitrile and at least one acryulic monomer, or mixtures of (i) and (ii).
    Type: Grant
    Filed: March 23, 1990
    Date of Patent: December 3, 1991
    Assignee: Bioresearch, Inc.
    Inventor: Pascal E. Esemplare
  • Patent number: 5064594
    Abstract: Improved process for extruding through a die a difficultly-melt-processible polymer, especially a polymer containing an additive such as an antiblock agent. There is first extruded through the die a polymer resin containing 0.001 to 1 wt. % of a copolymer of tetrafluoroethylene and a functional-group-containing monomer that is terminated in a -CF.sub.2 W group wherein W is selected from -SO.sub.2 F, -SO.sub.2 Cl, -SO.sub.3 M, -COOR and -COOM, R is a C.sub.1-3 alkyl radical and M is H, a metal cation or an ammonium or quaternary ammonium cation, and thereafter there is extruded through the die the difficultly-melt-processible polymer admixed with 0.001-1 wt. % of a fluoropolymer process said having a fluorine to carbon ratio of at least 1:2.
    Type: Grant
    Filed: September 20, 1990
    Date of Patent: November 12, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Donnan E. Priester, Robert E. Tarney
  • Patent number: 5061424
    Abstract: A composition which includes polyvinylpyrrolidone and a polyurethane is melt processed to give a shaped article. The melt processing may be a coextrusion with a substrate polymer to give a shaped article having the composition coated on the surface thereof. The article surface is lubricious when contacted with water.
    Type: Grant
    Filed: January 22, 1991
    Date of Patent: October 29, 1991
    Assignee: Becton, Dickinson and Company
    Inventors: Houshang Karimi, Mutlu Karakelle, Robert A. Taller
  • Patent number: 5057258
    Abstract: Segments of tire tread are utilized as patterning elements to produce elastomeric form liners useful for creating designs on poured concrete structures. The segments of tire tread are arranged in the interior of an open-faced mold box, and liquified elastomeric material is poured into the mold box and allowed to solidify. An elastomeric form is then separated from the mold box. This form may be used itself as a form liner, but is preferably used as a mold to produce further generations of forms and form liners. The form liners are used to line the interior of a concrete form, and the tread patterns are thereby imparted to the surface of the resulting concrete structure.
    Type: Grant
    Filed: September 22, 1989
    Date of Patent: October 15, 1991
    Inventor: Vicki B. Scuri
  • Patent number: 5047192
    Abstract: Process of manufacturing a cryogenic regenerator including a plurality of channels for conducting a working fluid, including the steps of providing a cylindrical forming member having a longitudinal axis and a plurality of peripheral slots displaced axially and oriented substantially parallel to the longitudinal axis of the cylindrical forming member, or having a continuous spiral peripheral slot of sufficiently small pitch such that the convolutions thereof are oriented substantially parallel to such longitudinal axis; providing epoxy which is relatively flexible upon hardening, loading the epoxy with thermally conductive material for enhancing the radial thermal conductivity of the cryogenic regenerator, and applying the epoxy to the periphery of the cylindrical forming member to fill the plurality of slots or the spiral peripheral slot with the epoxy and to form a radial layer of the epoxy of a generally first radial thickness allowing the epoxy to harden and thereafter reducing the radial thickness of the
    Type: Grant
    Filed: July 10, 1989
    Date of Patent: September 10, 1991
    Assignee: CDC Partners
    Inventors: John R. Purcell, Raymond E. Sarwinski
  • Patent number: 5035849
    Abstract: A process for producing a molded article is provided includinga) The surface of a mold is cooled with a releasing agent for powder molding which has, as an essential component, a copolymer AB derived from at least one monomer A represented by the following general formula (I) ##STR1## wherein X is a hydrogen atom or a methyl group, k is an integer of 0-5, l is an integer of 1-3, m is an integer of 1-3, n is an integer of 0-550 and Y is a methyl group or a fluorine atom-containing substituent having 1-20 carbon atoms,and at least one vinyl-polymerizable monomer B containing at least one alkyl acrylate or alkylmethacrylate wherein the alkyl group has 1 to 8 carbon atoms.b) The coated mold is heated.c) A powder of a non-rigid vinyl chloride resin containing a plasticizer is allowed to adhere to the heated mold to melt the powder.d) The mold, releasing agent and powder are cooled to form a molded article.e) The molded article is peeled from the mold.
    Type: Grant
    Filed: January 31, 1990
    Date of Patent: July 30, 1991
    Assignee: Chisso Corporation
    Inventors: Katsuoki Uemura, Masaru Ando, Jun-Ichi Yamauchi, Yoshinori Akutsu
  • Patent number: 5032336
    Abstract: A process for producing an aromatic polysulfone molding compound improved in mold-release characteristics by adding a predetermined amount of metal soap to aromatic polysulfone resin, wherein pellets composed of an aromatic polysulfone resin and a specific amount of metal soap, and otherwise similar pellets but containing no metal soap are prepared separately by melt-mixing, and these two kinds of pellets are dry-blended together so as to satisfy a predetermined condition.
    Type: Grant
    Filed: November 29, 1989
    Date of Patent: July 16, 1991
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kuniaki Asai, Kazuo Hieda
  • Patent number: 5026510
    Abstract: A cast mold and process for casting a substrate for an information recording medium has an uneven preformat pattern formed on the mold surface. The uneven preformat features a pattern corresponding to tracking grooves and information pits, each information pit portion has a size with a length b in the direction parallel to the pattern of the tracking groove of 2 to 15 .mu.m and a width a in the direction perpendicular thereto of 1 to 6 .mu.m and a height c of 300 to 3500 .ANG.. The pit pattern has a pitch which is 1.8-fold or more of pit length b.
    Type: Grant
    Filed: March 10, 1989
    Date of Patent: June 25, 1991
    Assignee: Canon Kabushiki Kaisha
    Inventor: Masataka Yashima
  • Patent number: 5019317
    Abstract: A process for producing a molded product by reacting an organic isocyanate component with an isocyanate reactive component. If the isocyanate component is based on a prepolymer of an isocyanate and a fatty acid ester, then the isocyanate reactive component must contain a fatty acid. Alternatively, if the isocyanate component contains a fatty acid, then the isocyanate reactive component must contain a zinc carboxylate. The system will release from bare steel.
    Type: Grant
    Filed: May 24, 1989
    Date of Patent: May 28, 1991
    Assignee: Mobay Corporation
    Inventors: Gregory H. Slocum, Donald W. Schumacher
  • Patent number: 5011647
    Abstract: Active hydrogen-containing compositions having internal mold release components are used in a process in preparing molded polymeric products. In the process, the active hydrogen-containing composition contains (a) a primary or secondary amine, (b) a carboxylic acid or amido carboxylic acid salt of a group II metal or of aluminum, lithium, copper, iron, cobalt or nickel, and optionally (c) a carboxylic acid or amido carboxylic acid.
    Type: Grant
    Filed: June 21, 1989
    Date of Patent: April 30, 1991
    Assignee: The Dow Chemical Company
    Inventors: Louis W. Meyer, Robert Carswell, J. Alan Vanderhider
  • Patent number: 5008316
    Abstract: Polyarylene sulfide molding compositions are provided with improved mold release properties by the inclusion of an internal lubricant comprising stearyl erucamide.
    Type: Grant
    Filed: September 1, 1989
    Date of Patent: April 16, 1991
    Assignee: Hoechst Celanese Corporation
    Inventors: Lachhman Wadhwa, Andrew M. Steurer
  • Patent number: 5002999
    Abstract: The preent invention is directed to an internal mold release composition comprising:(a) a zinc carboxylate selected from the group consisting of zinc stearate, zinc laurate and zinc oleate, and(b) a compatibilizer comprising a dispersion of polyurea and/or a polyhydrazodicarbonamide in an organic compound containing at least one hydroxyl group, in an amount sufficient to solubilize the zinc carboxylate.The invention also relates to the use of such composition.
    Type: Grant
    Filed: September 7, 1988
    Date of Patent: March 26, 1991
    Assignee: Mobay Corporation
    Inventors: Michael K. Lowery, John E. Dewhurst
  • Patent number: 4996011
    Abstract: A process for producing polyethylene materials in which ultrahigh molecular polyethylene is molded by compression, extrusion or rolling and stretching in a solid phase and at specified temperatures. The polymer is formed by a selected multi-stage polymerization with the use of a composite catalyst of specified compositions. Fibers or films are obtained with improved strength and modulus qualities.
    Type: Grant
    Filed: July 3, 1989
    Date of Patent: February 26, 1991
    Assignee: Nippon Oil Co., Ltd.
    Inventors: Akira Sano, Hirofumi Kamiishi, Kazuo Matsuura
  • Patent number: 4968473
    Abstract: Ceramic green films having advantageous isotropic distribution of the inorganic pigment can be obtained by casting and drying a slip containing finely divided inorganic pigment, organic solvents, polyvinylbutyral, plasticizer and dispersing agent if compounds which contain in their molecules at least one structural unit of the formula Z ##STR1## in which A and B, which must be different, stand for either the oxyalkylene unit --C.sub.3-4 H.sub.6-8 O-- or the oxyalkylene unit --C.sub.2 H.sub.4 O-- and x and y, which can be identical or different, each denote a number from 1 to 200, are used as dispersing agents.Ceramic green films produced according to the invention can be converted to isotropic ceramic substrates by subsequent heat treatment and sintering.
    Type: Grant
    Filed: December 7, 1988
    Date of Patent: November 6, 1990
    Assignee: Hoechst AG
    Inventors: Hans D. Hermann, Dieter Grote, Karl Waldmann
  • Patent number: 4968469
    Abstract: Molded articles such as gaskets for container caps are made from a thermoplastic composition at high speed, for instance above 100 per minute, by continuously cutting a continuous supply of molten thermoplastic composition into molten pieces and transferring the molten pieces to a molding position at which they are molded into the gaskets or other desired articles, and the composition includes a melt-release material that continuously replenishes a melt-release layer on the surfaces by which the molten composition is cut and transferred to the molding position.
    Type: Grant
    Filed: February 16, 1990
    Date of Patent: November 6, 1990
    Assignee: W. R. Grace & Co.-Conn.
    Inventor: Steven A. C. White
  • Patent number: 4961800
    Abstract: Disclosed are window envelopes and a method of making wherein the window envelope film from which window patches are made contains an anti-flecking agent in the form of a wax.
    Type: Grant
    Filed: July 18, 1988
    Date of Patent: October 9, 1990
    Assignee: The Dow Chemical Company
    Inventors: Stephen I. Foster, Jeffrey J. Stimler
  • Patent number: RE33609
    Abstract: The present invention is directed to a process for the production of polyurethane moldings by reacting a reaction mixture comprising(a) an organic polyisocyanate(b) a compatible polyol blend comprising(i) at least one polyether polyol having a hydroxyl functionality of from 2 to 8, and a molecular weight of from 350 to below 1800, and(ii) at least one hydroxyl functional organic material containing from 2 to 8 hydroxyl groups and having a molecular weight below 350, components (i) and (ii) being used in a weight ratio of component (b)(i) to (b)(ii) of from about 10:1 to about 1:10, and(iii) no more than 45% by weight based on the weight of component (b) of an active hydrogen containing compound having a molecular weight of 1800 or more,said reaction mixture being processed as a one-shot system by the RIM process at an isocyanate index of from about 70 to about 130.
    Type: Grant
    Filed: March 31, 1989
    Date of Patent: June 11, 1991
    Assignee: Mobay Corporation
    Inventor: Neil H. Nodelman