Utilizing Release Agent In Molding Material Patents (Class 264/300)
-
Publication number: 20040201129Abstract: A cope containing TAC is cast from a casting die onto a belt such that a film after the drying may have a thickness at 40 &mgr;m. A solvent of the dope solution on the belt evaporates, and thus a gel-like film may be formed. The peeling force of the gel-like film becomes to the maximum when the weight percentage of the remaining solvent in the gel-like film is 25 wt. %. In order to reduce the generation of mura or unevenness of the thickness, the gel-like film is peeled from a belt with a support of a peeling roller, when the weight percentage of the remaining solvent is at most 20 wt. %. The peeled gel-like film is dried in a tenter dryer and a casting chamber to be a film. After cooled in a cooling chamber, the film is wound by a winding device.Type: ApplicationFiled: March 26, 2004Publication date: October 14, 2004Applicant: FUJI PHOTO FILM CO., LTD.Inventor: Kazuhide Kanemura
-
Patent number: 6800230Abstract: To stabilize a friction coefficient of a dust seal member or brake-gap adjustment seal member to a piston in a disc brake regardless of temperature change. At least an inner circumferential surfaces of a dust seal member and a brake-gap adjustment seal member, attached to a brake caliper, are coated with a friction reducing agent.Type: GrantFiled: March 5, 2002Date of Patent: October 5, 2004Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Yoshimi Ishikawa, Hirofumi Noro, Shinichi Kuwahara
-
Patent number: 6797222Abstract: A slush molding process in which the moldable thermoplastic composition powder dosed to the mold is prepared by blending ethylene carboxylic acid copolymers or ionomers with ethylene/glycidyl acrylate or methacrylate copolymer and cross-linking promoter at a temperature and for a time that does not cause significant cross-linking prior to dosing to mold, which is held for sufficient time and temperature to cause cross-linking in-situ, and optionally, other additives including release agents.Type: GrantFiled: October 31, 2002Date of Patent: September 28, 2004Assignee: E. I. du Pont de Nemours and CompanyInventors: Karlheinz Hausmann, George K. Kodokian, George W. Prejean
-
Patent number: 6783719Abstract: A method and a system for fabricating articles made from thermoset resins using an ionic mold release agent. The invention uses a mold having a metal oxide surface with enhanced mold release characteristics. The release agent is applied internally in the resin composition or externally on the metal oxide surface. The method includes providing a mold, forming a metal oxide surface on the mold, providing an ionic release agent, providing the acid or base conjugate of the release agent at the metal oxide surface, providing a thermoset resin in the mold, and curing the resin in the mold. A method of using float glass having a SnO2 enriched surface, wherein the method includes the steps of providing an ionic release agent externally to the tin oxide surface, is also disclosed.Type: GrantFiled: February 16, 2001Date of Patent: August 31, 2004Assignee: Korry Electronics, Co.Inventors: Timothy R. Robinson, Shubang Gan, Stephen H. Humphrey
-
Publication number: 20040130054Abstract: A plastic closure that comprises a cap having a base with a peripheral skirt defining the cap interior and threads on the skirt for securing the closure to a container. A liner is secured to the interior of the cap, preferably by being compression molded in situ on the base. The liner consists essentially of a multiplicity of alternating layers of a matrix polymer material such as EVA and a barrier material such as EVOH to resist transmission of gas, water vapor and/or flavorants through the liner. The matrix polymer material preferably is preblended with a compatibilizer material such as a maleic anhydride grafted polymer that ties the matrix polymer material to the barrier material.Type: ApplicationFiled: October 7, 2003Publication date: July 8, 2004Inventor: David B. Riffer
-
Publication number: 20040089512Abstract: The invention relates to a method for obtaining a clutch lining consisting in: injecting a friction material containing a polyester resin into a mould; the material also contains a polymerisation catalyst, glass fibres, chalk, mica, talc, kaolin, thermoplastic fillers and a mould release agent. The invention also relates to a clutch lining obtained using said method and a clutch disc fitted with one such lining.Type: ApplicationFiled: January 6, 2003Publication date: May 13, 2004Inventors: Michel Marchisseau, Christian Biot, Gerard Boyer
-
Publication number: 20040082718Abstract: A styrene block copolymer is mixed with process mineral oil and includes a small amount of antioxidant which reduces surface stickiness in the finished material upon exposure to air. The material can simulate the touch and feel of human skin for a wide variety of applications.Type: ApplicationFiled: August 15, 2003Publication date: April 29, 2004Inventors: Christopher Yuen Ming Chan, Lin Tak Chan
-
Patent number: 6669879Abstract: A process for producing solid dosage forms by forming a plastic mixture of at least one polymeric binder, at least one active ingredient and, where appropriate, conventional additives, and shaping the plastic mixture to the solid dosage forms using a mold, wherein an agent which modifies the surface properties is applied in finely divided form to the surface of the plastic, mixture during the shaping is described. The agent which modifies the surface properties is preferably a surfactant, a lipophilic compound, an antioxidant, a coloring agent or an agent with antistatic effect and/or lubricant effect.Type: GrantFiled: February 26, 2001Date of Patent: December 30, 2003Assignee: Abbott LaboratoriesInventors: Reinhard Spengler, Jörg Rosenberg
-
Patent number: 6649677Abstract: It has been discovered that the fire resistance properties of polycarbonate sheet can be greatly enhanced by significantly reducing the viscosity of the resin used to manufacture the sheet. Moreover, the fire resistance of the sheet can be further enhanced by carefully controlling the content of phosphorous-based stabilizer, in combination with the processing release agent, within a specific range.Type: GrantFiled: November 3, 1998Date of Patent: November 18, 2003Assignee: General Electric CompanyInventors: Marja A. Jaatinen, Johanes M. Goossens
-
Patent number: 6610239Abstract: The invention comprises a mold useful for the preparation of a polyurethane based article comprising a metal coated on the surfaces to come in contact with the polyurethane materials wherein the coating is a continuous matrix of cobalt or nickel having dispersed in such discontinuous matrix a fluorinated polyolefin polymer. In another aspect the invention is a process for injection molding a part from polyurethane materials which process comprises injecting polyurethane based materials into a mold as described above, exposing the injected materials to conditions such that a solidified article is formed and removing the formed article from the mold. In another aspect the invention is an article comprising polyurethane material prepared by injection molding which contains about 0.5 percent by weight or less of an internal mold release and which can be coated in an industrial coating process without the need for a sealer coated on the article.Type: GrantFiled: February 15, 2001Date of Patent: August 26, 2003Assignee: Dow Global Technologies Inc.Inventor: John W. McLaren
-
Patent number: 6607687Abstract: Process for producing a molded article comprising pouring or injecting a liquid molding material into a mold in the presence of a surface-treating agent comprising a contact angle-reducing substance under the condition that the contact angle between the liquid molding material and the inner surface of the mold is not more than 30°, and curing the liquid molding material; surface-treating agent comprising a contact angle-reducing substance which reduces the contact angle between the liquid molding material and a flat plate made of the same material as the mold to not more than 30°; method for reducing surface voids during molding, comprising using the above surface-treating agent; and use of the above surface-treating agent for reducing surface voids. The molded article has a shape accurately corresponding to the shape of an inner surface of a mold.Type: GrantFiled: October 27, 2000Date of Patent: August 19, 2003Assignee: Kao CorporationInventors: Makoto Okubo, Kazuhiko Kiuchi, Ryoichi Hashimoto, Takayuki Nomura, Masahiro Mori, Kenichi Miyamoto
-
Publication number: 20030082319Abstract: A process for preparing an end termination for use with a reclosable polymeric bag comprises providing a mixture comprising from about 70 to about 95 wt. % of a polyolefin, from about 5 to about 25 wt. % hydrocarbon, from about 0.01 to about 2 wt. % mold release agent, from about 0.1 to about 1 wt. % primary antioxidant, and at least about 0.06 wt. % secondary antioxidant. Next, the mixture is heated approximately to its appropriate application temperature and the melted mixture is injected into a mold. After the mixture is cooled to form the end termination, the end termination is ejected from the mold.Type: ApplicationFiled: October 11, 2001Publication date: May 1, 2003Inventors: Thomas A. White, Nathan A. Kolovich, Edwin Jackson-Kuofie
-
Patent number: 6551688Abstract: A calendered film or sheet of a polyester resin composition has a haze value of less than 5 percent. The polyester resin composition comprises a polyester having a crystallization half-time from a molten state of at least 5 minutes and an additive comprising (i) a fatty acid or a salt of a fatty acid containing more than 18 carbon atoms and (ii) an ester wax comprising a fatty acid containing more than 18 carbon atoms with an alcohol containing from 2 to 28 carbon atoms, wherein the ratio of the fatty acid or salt of the fatty acid to the ester wax is 1:1 or greater. Also, the present invention is a process for producing such calendered film or sheet having a haze value of less than 5 percent.Type: GrantFiled: February 28, 2001Date of Patent: April 22, 2003Assignee: Eastman Chemical CompanyInventors: Eric Jon Moskala, Kevin Douglas Horton
-
Publication number: 20030057096Abstract: A compliant cantilevered three-dimensional micromold is provided. The compliant cantilevered micromold is suitable for use in the replication of cantilevered microparts and greatly simplifies the replication of such cantilevered parts. The compliant cantilevered micromold may be used to fabricate microparts using casting or electroforming techniques. When the compliant micromold is used to fabricate electroformed cantilevered parts, the micromold will also comprise an electrically conducting base formed by a porous metal substrate that is embedded within the compliant cantilevered micromold. Methods for fabricating the compliant cantilevered micromold as well as methods of replicating cantilevered microparts using the compliant cantilevered micromold are also provided.Type: ApplicationFiled: August 15, 2002Publication date: March 27, 2003Inventors: Alfredo Martin Morales, Linda A. Domeier, Marcela G. Gonzales, Patrick N. Keifer, Terry Joseph Garino
-
Patent number: 6537472Abstract: A process for producing a cushioning article, which comprises: providing an injection molding apparatus having plural injection orifices, said orifices each having a discharge angle from 5° to 45° inclining from the vertical direction; injecting a thermoplastic polymer material in the form of strand from said plural orifices into a mold; and cooling said mold followed by demolding. The discharge angles of said orifices as projected into a horizontal plane each preferably has a phase difference of from 5° to 120° relative to those of adjacent orifices. Also disclosed is a cushioning article molded by the production process.Type: GrantFiled: February 27, 2001Date of Patent: March 25, 2003Assignee: Asahi Kasei Kabushiki KaishaInventor: Tetsuo Masubuchi
-
Patent number: 6528005Abstract: A process for producing a lens comprising polymerizing bis(&bgr;-epithiopropyl)ether to form a lens.Type: GrantFiled: June 11, 2001Date of Patent: March 4, 2003Assignee: Mitsubishi Gas Chemical Co., Inc.Inventors: Akikazu Amagai, Motoharu Takeuchi, Atsuki Niimi
-
Patent number: 6525122Abstract: In order to achieve, in the case of a plastics moulding, in particular a moulded part such as e.g. a kitchen sink, a washbasin or a work-top or similar, comprising a polymer phase formed from a curable reaction mass and,: embedded therein, a particulate filling material which contains a resin material filled with an inorganic filler, in addition to a good resistance to water whitening a high resistance to crack formation in the hot-cold cycle, it is proposed that the polymer phase contains up to 5 wt %, referred to the plastics moulding, of inorganic additive particles, that the particulate filling material is swellable in the curable reaction mass, that the filled resin material comprises a content of inorganic filler in the range from 50 to 80 wt % with an average particle size of approx. 5 to approx. 100 &mgr;m, and that the filling material has a particle size in the range from 60 to 8000 &mgr;m and is contained in the plastics moulding in a proportion of approx. 30 to approx. 75 wt %.Type: GrantFiled: March 18, 1999Date of Patent: February 25, 2003Assignee: Schock & Co. GmbHInventors: Friedrich Schock, Karl Schock, Gunter Hieber, Daniel Knospe, Horst Schlier
-
Publication number: 20030020210Abstract: A method and a system for fabricating articles made from thermoset resins using an ionic mold release agent. The invention uses a mold having a metal oxide surface with enhanced mold release characteristics. The release agent is applied internally in the resin composition or externally on the metal oxide surface. The method includes providing a mold, forming a metal oxide surface on the mold, providing an ionic release agent, providing the acid or base conjugate of the release agent at the metal oxide surface, providing a thermoset resin in the mold, and curing the resin in the mold. A method of using float glass having a SnO2 enriched surface, wherein the method includes the steps of providing an ionic release agent externally to the tin oxide surface, is also disclosed.Type: ApplicationFiled: January 19, 2001Publication date: January 30, 2003Applicant: Korry Electronics Co..Inventors: Timothy R. Robinson, Shubang Gan, Stephen H. Humphrey
-
Publication number: 20030015122Abstract: Fatty acid/polyolefin wax release agent systems useful in the manufacture of lignocellulosic materials is disclosed. The fatty acid/polyolefin wax release agent systems are particularly useful in the manufacture of lignocellulosic materials formed with polyisocyanate binder.Type: ApplicationFiled: August 9, 2002Publication date: January 23, 2003Inventors: Christopher J. Moriarty, James A. Yavorsky
-
Publication number: 20030013616Abstract: Disclosed are a method for manufacturing an outsole for shoes without applying an external mold release agent or mold rubricant onto a mold, and a formulating composition used at manufacturing a rubber outsole. One composition of an internal mold rubricant for manufacturing an outsole for use in footwears is consisting of highly branched hydrocarbon having molecular weight of 400 to 2800, carboxylic acid, metal salts of carboxylic acids, and phospholipids containing heat stable lecithin. Another composition of an internal mold rubricant for manufacturing an outsole for use in footwears is consisting of branched hydrocarbon having molecular weight of 800 to 2000, carboxylic acid, long chain carboxylic acids having molecular weight of 200 to 800, metal complex of long chain carboxylic acids having molecular weight of 200 to 800, and ionomer.Type: ApplicationFiled: August 15, 2002Publication date: January 16, 2003Inventors: Hee-Dae Park, Yagnick Metha
-
Publication number: 20020188092Abstract: A calendered film or sheet of a polyester resin composition has a haze value of less than 5 percent. The polyester resin composition comprises a polyester having a crystallization half-time from a molten state of at least 5 minutes and an additive comprising (i) a fatty acid or a salt of a fatty acid containing more than 18 carbon atoms and (ii) an ester wax comprising a fatty acid containing more than 18 carbon atoms with an alcohol containing from 2 to 28 carbon atoms, wherein the ratio of the fatty acid or salt of the fatty acid to the ester wax is 1:1 or greater. Also, the present invention is a process for producing such calendered film or sheet having a haze value of less than 5 percent.Type: ApplicationFiled: February 28, 2001Publication date: December 12, 2002Inventors: Eric Jon Moskala, Kevin Douglas Horton
-
Publication number: 20020135099Abstract: A method and a system for fabricating articles made from thermoset resins using an ionic mold release agent. The invention uses a mold having a metal oxide surface with enhanced mold release characteristics. The release agent is applied internally in the resin composition or externally on the metal oxide surface. The method includes providing a mold, forming a metal oxide surface on the mold, providing an ionic release agent, providing the acid or base conjugate of the release agent at the metal oxide surface, providing a thermoset resin in the mold, and curing the resin in the mold. A method of using float glass having a SnO2 enriched surface, wherein the method includes the steps of providing an ionic release agent externally to the tin oxide surface, is also disclosed.Type: ApplicationFiled: February 16, 2001Publication date: September 26, 2002Inventors: Timothy R. Robinson, Shubang Gan, Stephen H. Humphrey
-
Patent number: 6413630Abstract: A decorative film having an excellent decorative effect, excellent three-dimensional curvature emulating properties, three-dimensional curvature formability, long-term weather resistance and stain resistance. The decorative film comprises one or more transparent layers and a decorative metal layer. The transparent layer has an adhered side for being adhered to a substrate. The transparent layer comprises a copolymer of a tetrafluoroethylene, a hexafluoropropylene and a vinylidene fluoride. The decorative metal layer is on the adhered side of the transparent layer. A substrate can be bonded to the metal layer of the decorative film. The substrate can be a complex three-dimensional shaped substrate. The substrate can also be an injection molded substrate. An adhesive can be disposed on the metal layer of the decorative film, and the adhesive layer can be disposed between the metal layer and the substrate.Type: GrantFiled: November 4, 1999Date of Patent: July 2, 2002Assignee: 3M Innovative Properties CompanyInventor: Akihiko Nakayama
-
Patent number: 6352666Abstract: A powder-free coagulant for use in latex dipping processes comprises a salt stable dispersion of a polychloroprene rubber and an inorganic metal salt. Optionally the coagulant will also contain a powder-free release agent, to aid release of the dipped article from the former, comprising a polypropylene wax emulsion and a cationic surfactant.Type: GrantFiled: November 5, 1999Date of Patent: March 5, 2002Assignee: Ansell Healthcare Products Inc.Inventors: Jeffery G. Nile, Stanley J. Gromelski, Nevin D. Gerber
-
Patent number: 6347409Abstract: A powder-free coagulant for use in latex dipping processes comprises a salt stable dispersion of a polychloroprene rubber and an inorganic metal salt. Optionally the coagulant will also contain a powder-free release agent, to aid release of the dipped article from the former, comprising a polypropylene wax emulsion and a cationic surfactant.Type: GrantFiled: May 5, 2000Date of Patent: February 19, 2002Assignee: Ansell Healthcare Products Inc.Inventors: Jeffery G. Nile, Stanley J. Gromelski, Nevin D. Gerber
-
Publication number: 20020009564Abstract: An additive system for polyester polymers comprising an effective amount of (i) a fatty acid amide selected from the group consisting of oleyl palmitamide, ethylene bis stearamide, ethylene bis oleomide, and stearyl erucamide; (ii) a partially or fully calcined porous poly(methylsilsequioxane); and (iii) a stabilizer comprising a primary and a secondary antioxidant.Type: ApplicationFiled: March 27, 2001Publication date: January 24, 2002Inventors: Graham H. Hall, Michael A. Neal, Stephen D. Jenkins, Junaid A. Siddiqui
-
Patent number: 6235228Abstract: Method for on-mold surface coating fiberglass-reinforced molded articles during their manufacture with environmentally friendly and physiologically safe thermosetting unsaturated polyester on-mold coating powders which serve as replacements for liquid gel coats. The thermosetting coating powders employed are adapted to cure at low temperatures to avoid causing thermal damage to the heat sensitive plastic molds which must be reused over and over again, and to cure in the presence of atmospheric oxygen to enable over coating with liquid fill resins and fiberglass, which constitute the bulk of the finished article, without having the fill resins bleed through the powder coating film and detrimentally affect the overall quality of the surface finish.Type: GrantFiled: April 8, 1999Date of Patent: May 22, 2001Assignee: Morton International, Inc.Inventors: Edward G. Nicholl, Navin B. Shah
-
Patent number: 6231656Abstract: The invention provides improved release agents used in processes for preparing molded lignocellulosic articles. The release agents are preferably applied as an emulsion in processes for preparing molded articles such as oriented strand board, waferboard or plywood. The release agents contain a co-oxidized blend of a first wax and a second wax, wherein the first wax has a Brookfield viscosity which is at least about 150 mPas at 140° C. and the second wax has a Brookfield viscosity which is less than about 100 mPas at 140° C.Type: GrantFiled: February 18, 1999Date of Patent: May 15, 2001Assignee: Allied Signal Inc.Inventors: Marc Dekerf, Manfred K. Seven, Dirk Danneels
-
Patent number: 6221296Abstract: A method of making a magnetically encodable card which comprises forming a dispersion of ferromagnetic particles in an organic fluid medium, forming a composite by intimately combining the dispersion with a thermoplastic resin plasticized by the organic fluid medium and forming the composite into an encodable card.Type: GrantFiled: April 7, 1995Date of Patent: April 24, 2001Assignee: Eastman Kodak CompanyInventors: Robert Owen James, Mary-Irene Elizabeth Condo, Bradford Drake West, Lawrence Allen Rowley
-
Patent number: 6217812Abstract: Method for producing a plate-shaped component. This involves the preparation of a first suspension comprising an alcohol as the dispersing medium and a base material for the plate. A second suspension is prepared which comprises binder, water as the gelling agent and an alcohol as the dispersion medium, possibly with the addition of Li/K or Li/Na carbonate. These two suspensions are mixed together, possibly with the addition of fibers. After mixing, a plate-shaped component is fabricated with the aid of the “tape casting” technique.Type: GrantFiled: November 25, 1998Date of Patent: April 17, 2001Assignee: Stichting Energieonderzoek Centrum NederlandInventors: Robert De Rooij, Pieter Nammensma
-
Patent number: 6074588Abstract: A mold releasing agent comprising a silicon-containing compound represented by the formula:R.sup.1.sub.n SiR.sup.2.sub.4-nwherein R.sup.1 is ##STR1## (R.sup.3 and R.sup.4 are a hydrocarbon group having 1 to 4 carbon atoms), R.sup.2 is a hydrocarbon group having 1 to 4 carbon atoms or a halogenated hydrocarbon group having 1 to 4 carbon atoms, n is 3 or 4, and a silicon- and/or fluorine-containing compound having at least two hydroxyl groups or alkoxyl groups in one molecule. The mold releasing agent of the present invention is excellent in mold releasing property, has a long life, provides a good surface finishing of molded article, and has no influence on secondary processability.Type: GrantFiled: May 15, 1996Date of Patent: June 13, 2000Assignee: Daikin Industries, Ltd.Inventors: Masayuki Yamana, Tomohiro Hosomi, Hirotoshi Sakashita, Masato Kashiwagi
-
Patent number: 6068910Abstract: A polyester resin composition is calendered to produce a film or a sheet. The polyester resin composition is a polyester having a crystallization half time from a molten state of at least 5 minutes combined with an additive for preventing sticking of the polyester to calendering rolls.Type: GrantFiled: February 26, 1999Date of Patent: May 30, 2000Assignee: Eastman Chemical CompanyInventors: Paul Mary Flynn, Richard Leon McConnell, Hubertus Jacobus Wilhelmus Moolenaar, Timothy Michael Sanders
-
Patent number: 6054518Abstract: In a silicone rubber composition comprising an organopolysiloxane, reinforcing silica, and a curing agent, an ester wax, typically having a melting point of 40-150.degree. C., is blended as an abherent. When the composition is molded in a mold, the flow of the composition in the mold and the parting of the cured silicone rubber from the mold are significantly improved.Type: GrantFiled: September 16, 1998Date of Patent: April 25, 2000Assignee: Shin-Etsu Chemical Co., Ltd.Inventor: Osamu Hayashida
-
Patent number: 5972271Abstract: A modified bitumen sheet material and method for a protective moisture barrier, particularly for masonry surfaces. The sheet material has a bitumen layer modified by the addition of a minor amount of a long-chain polybutadiene-isocyanate urethane polymer and optionally, a modifying amount of a hydrocarbon oil to provide a stable, non-flow and selected tackified surface properties to the bitumen layer. The sheet material includes a releasable casting paper film on one surface of the bitumen layer, to be removed prior to use, and a cross-linked polyethylene film bonded to the other outer surface of the bitumen layer as a handling or moisture barrier sheet. The sheet material is prepared by casting the hot, melted bitumen as a layer onto a casting paper sheet and applying the outer film to the exposed bitumen surface to bond to the top surface.Type: GrantFiled: February 27, 1998Date of Patent: October 26, 1999Assignee: Interface, Inc.Inventors: C. Edward Terry, Raymond A. Berard, Daniel F. Pinholster, Jr.
-
Patent number: 5908496Abstract: Process for the production of sheets or molded bodies from lignocellulosic materials utilising an organic polyisocyanate binder material and a release agent which is an aqueous emulsion of a polyolefin wax.Type: GrantFiled: July 2, 1997Date of Patent: June 1, 1999Assignee: Imperial Chemical Industries PLCInventors: Bart Singule, James Anthony Yavorsky
-
Patent number: 5879782Abstract: This invention relates to a process for forming a single-layer, durably wettable polymeric web having a plurality of apertures. This process comprises melting a mixture of at least one thermoplastic polymer and at least one migratable surfactant and extruding the mixture to form a single-layer, substantially continuous polymeric film. The film is then apertured using high pressure fluid flows. Aperture formation is conducted when the single-layer polymeric film has a contact angle of at least about 30.degree., to minimize wash-off of the surfactant impregnated in the polymer web. The invention also relates to durably-wettable apertured webs.Type: GrantFiled: August 11, 1998Date of Patent: March 9, 1999Assignee: The Procter & Gamble CompanyInventors: Yann-Per Lee, Ronald Bernd Holzwarth, Lanying Wu
-
Patent number: 5855958Abstract: A method of making a cast concrete stepping stone whose exposed upper surface has the appearance of two or more grouted attractive natural stepping stones. A liquid release agent is applied to the mold which is then placed on a vibrator table and filled with wet concrete. The mold is vibrated for about 30 seconds and the surface of the concrete troweled smooth. Dry body color is sprinkled over the concrete surface and troweled to completely cover the concrete. A dry release agent containing powdered color having a darker shade than the body color is sprinkled over the dry body color covering the concrete. The desired pattern is then pressed into the surface of the concrete and after a six hour drying time, the cast stepping stone is removed from the mold. Excess body color and release agent are washed away and the washed surfaces totally dried. Finally a clear concrete sealer is applied to the exposed upper surface of the concrete stepping stone.Type: GrantFiled: December 7, 1995Date of Patent: January 5, 1999Inventor: Lawrence Edward Nash
-
Patent number: 5817365Abstract: Rubber articles are produced by applying a first latex to a former and then applying either a second latex, or a separation material followed by a latex which may be the same as, or different to, the first latex, curing both latices, and removing both layers jointly, so as to make an article with an outer translucent layer and an inner darker layer, with capillary action permitted between the layers.Type: GrantFiled: March 15, 1995Date of Patent: October 6, 1998Inventors: Margaret Pamela Richardson, Philip Richardson
-
Patent number: 5792412Abstract: This invention relates to a process for forming a single-layer, durably wettable polymeric web having a plurality of apertures. This process comprises melting a mixture of at least one thermoplastic polymer and at least one migratable surfactant and extruding the mixture to form a single-layer, substantially continuous polymeric film. The film is then apertured using high pressure fluid flows. Aperture formation is conducted when the single-layer polymeric film has a contact angle of at least about 30.degree., to minimize wash-off of the surfactant impregnated in the polymer web. The invention also relates to durably-wettable apertured webs.Type: GrantFiled: September 13, 1996Date of Patent: August 11, 1998Assignee: The Procter & Gamble CompanyInventors: Yann-Per Lee, Ronald Bernz Holzwarth, Lanying Wu
-
Patent number: 5759461Abstract: A method of forming a two-layer plastic pipe (4;8) to be laid in the ground for conducting material therethrough forms a core pipe (2) consisting essentially of a first plastic material and forms a detachable outer hose (3;7) of a second plastic material around said core pipe (2) by a suitable coating method, including in said second plastic material an amount of additives effective to protect said core pipe with said outer hose from stresses and loads of laying said core pipe and outer hose and usage thereof in ground.Type: GrantFiled: December 23, 1993Date of Patent: June 2, 1998Assignee: Uponor Innovation ABInventors: Jyri Jarvenkyla, Mikael Andersson, Anders Vestergaard
-
Patent number: 5746961Abstract: An enhancement composition and a method for its use in a molding process. The enhancement composition is applied to the interior surfaces of the mold cavity used in a molding process such as blow molding, injection molding, thermoforming or rotational molding. The enhancement composition is applied prior to closing of the mold and molding of the plastic article. The enhancement composition comprises a liquid carrier containing up to about 50 weight percent of enhancement solids which comprise a mixture of an enhancement solid such as particles of varied thermoplastic and thermosetting resins, metal flakes, glass beads, carbon, graphite, etc., and a binder solid which can be a hydrocarbon resin, wax, rosin or terpene base resin. The invention provides for almost unlimited modification of the surfaces of molded plastic products, offering the plastics fabricator the ability to mold products having very specialized surface properties with a low cost structural polymer, e.g.Type: GrantFiled: December 4, 1995Date of Patent: May 5, 1998Assignee: Michael J. StevensonInventors: Michael H. Stevenson, Robert A. Reeves
-
Patent number: 5723388Abstract: The present invention provides a prepreg obtained by stretching a material including, as a main component, an ultra-high-molecular-weight polyethylene having an intrinsic viscosity of 5-50 dl/g as measured at 135.degree. C. in decalin, to a total draw ratio of at least 20, subjecting the resulting stretched polyethylene material to a splitting treatment, and impregnating the resulting material with a thermosetting resin. The split stretched polyethylene material has improved adhesion to the impregnant resin and can be used as a good base material for prepreg.Type: GrantFiled: January 7, 1997Date of Patent: March 3, 1998Assignees: Nippon Oil Co., Ltd., Nippon Petrochemicals Co., Ltd., Polymer Processing Research Institute Ltd.Inventors: Seizo Kobayashi, Kazutosi Nomiyama, Yoshimu Iwanami, Sumio Yoshida, Kazuhiko Kurihara, Hiroshi Yazawa
-
Patent number: 5711908Abstract: With a process for manufacturing compostible thin-walled molded articles such as cups, plates, fast-food packagings, trays, flat sheets and the like, by applying a starch-based baking composition on the lower part of a multipart, preferably bipartite mold, to obtain a tough, durable article of high mechanical stability by using an essentially fat-free baking composition composed of water, a starch product, a release agent, and optionally further conventional additives, by baking the baking composition filling the mold, and by conditioning the resulting product to establish a moisture content of 6-22% by weight, the invention proposes the use, in addition to or instead of starch, of at least one modified starch selected from the group comprising starch esterified with organic acids or phosphoric acid, etherified starch, cross-linked starch and starch capable of being modified by ionic interaction.Type: GrantFiled: June 3, 1996Date of Patent: January 27, 1998Assignee: Franz Haas Waffelmaschinen Industriegesellschaft m.b.H.Inventors: Karl Tiefenbacher, Franz Haas, Sr., Johann Haas
-
Patent number: 5710231Abstract: An isocyanate-reactive composition is provided which comprises:(a) at least one compound having a plurality of isocyanate-reactive groups; and(b) a fatty polyamine having the formula:R.sup.1 --(NH--R.sup.2).sub.x --NH.sub.2wherein R.sup.1 is an alkyl group containing 8 to 40 carbon atoms, R.sup.2 is a divalent linking group containing 1 to 8 carbon atoms and x has a value of 1 to 4. Methods for preparing flexible foam articles utilizing the isocyanate-reactive compositions are also provided.Type: GrantFiled: February 20, 1996Date of Patent: January 20, 1998Assignee: Imperial Chemical Industries PLCInventors: Brian Fogg, Herbert Russell Gillis, Nai Wen Lin
-
Patent number: 5705546Abstract: A thermoplastic molding composition having improved release properties is disclosed. The composition contains a polycarbonate and an additive amount of an epoxy conforming structurally to ##STR1## where R is a member selected from the group consisting of glyceryl and trimethyl propyl radicals, x is 0 to 20 and R' is a C.sub.1-4 alkyl radical.Type: GrantFiled: June 13, 1996Date of Patent: January 6, 1998Assignee: Bayer CorporationInventors: Sivaram Krishnan, James B. Johnson
-
Patent number: 5688459Abstract: The present invention provides a process for preparing a high water-containing elastomer medical catheter and a urinary catheter prepared by the process. The process is carried out by a) heating a mixture consisting of polyvinyl alcohol, water, sulfoxide and linear alkane, in a sealed vessel with agitating; b) pouring the resulting homogeneous fluid into a mould; c) solidifying the fluid by cooling; d) releasing the solidified fluid from the mould; and e) heat-treating the resulting medical catheter and washing with a polar organic solvent. The medical catheter and the urinary catheter of the present invention have excellent lubricity.Type: GrantFiled: May 19, 1995Date of Patent: November 18, 1997Assignee: Chin Rehabilitation Research CenterInventors: Lijiang Mao, Yuanjie Hu, Dongxu Piao
-
Patent number: 5686187Abstract: The invention provides a molded polyurethane article having internal mold release properties. The polyurethane article comprises the reaction product of an isocyanate component (I) and an isocyanate-reactive polyol component (II). The polyol component comprises an isocyanate-reactive polyol (A) having a molecular weight from 100 to about 10,000 and an effective amount of an internal mold release composition (B). The internal mold release composition comprises a silicon-containing polymer (a) and a diester functional compound (b). The diester compound comprises the reaction product of an aromatic dicarboxylic acid (i) and an alcohol having from 2 to 30 carbons.Type: GrantFiled: December 14, 1995Date of Patent: November 11, 1997Assignee: BASF CorporationInventor: James Turnbach
-
Patent number: 5641824Abstract: A self-lubricating polymeric composition, characterized as a melt blend of a thermoplastic polymer and a lubricating system containing ultra high molecular weight polyethylenes, a polyester, acid metal salts, calcium salts, antioxidants and stabilizers. The composition may be prepared into shaped articles which exhibit improved surface wear resistance and coefficients of friction.Type: GrantFiled: February 6, 1996Date of Patent: June 24, 1997Assignee: Hoechst Celanese CorporationInventor: Alex Forschirm
-
Patent number: 5637366Abstract: Polyester-containing multilayer biaxially-oriented polypropylene films are provided. According to the invention, a two- or three-layer polyester-containing cap layer is bonded to a monoaxially oriented polypropylene core, followed by orientation of the resulting composite in a direction transverse to the direction of orientation of the core layer. At least one tie layer is interposed between the core and the polyester. Advantageously, the polyester contains silicone fluid as a processing aid.Type: GrantFiled: June 7, 1995Date of Patent: June 10, 1997Assignee: QPF, Inc. (Delaware Corporation)Inventors: Alan M. Davis, John Lawrence, Deepak Mehta
-
Patent number: 5624617Abstract: A method of manufacture is disclosed for a PTCA guiding catheter. The catheter includes a lamination of an inner structural polymer tube, a lubricating means disposed on the inside of the inner structural polymer tube, a reinforcement means embedded at least partially within the inner structural polymer tube, and an outer structural polymer tube embedded at least partially within the reinforcement means and fused at least partially to the inner structural polymer tube.Type: GrantFiled: December 30, 1994Date of Patent: April 29, 1997Assignee: Medtronic, Inc.Inventors: Robert W. Sorabella, Daniel O. Lausten