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| Number | Title | Issue Date |
| 4927909 | Fabrication of high performance polybenzimidazole films 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) ev... | 05/22/1990 |
| 4923654 | Blowing agent for expandable polymeric foams A volatile foaming agent for thermoplastic foam is a blend of about 65 to 75 weight percent chlorodifluoro-methane and from about 25 to 35 weight percent pentane.... | 05/08/1990 |
| 4909972 | Method and apparatus for making a solid foamed tire core A method of making a solid core locatable between a wheel rim and a tire fitted to the rim, includes introducing a foamable composition into a mould cavity having a substantially inflexible mould surface. The cavity is suitably shaped so that a core locat... | 03/20/1990 |
| 4892544 | Methods for forming hollow, porous-surfaced elastomeric bodies A method of forming hollow, porous elastomeric bodies and hollow, duo-layered elastomeric bodies wherein one layer is porous and contiguous with the other layer which is solid by (a) coating a surface of a mandrel with a coating liquid, (b) adhering a lay... | 01/09/1990 |
| 4890485 | Mechanism which reacts to the presence of oil and/or water A system for the detection of oil or water leakages having a housing with a plurality of openings. The housing is to have a sufficient volume to permit the expansion of an absorbent material when such is placed within it. Additionally the housing is to ha... | 01/02/1990 |
| 4889669 | Process for producing foamed thermoplastic resin articles A process for producing a foamed thermoplastic resin article is disclosed, comprising separately melt kneading the first thermoplastic resin composition comprising a first thermoplastic resin and 10 to 400 parts by weight per 100 parts by weight of the fi... | 12/26/1989 |
| 4889671 | Production method of prefoamed particles of polyolefin resin Prefoamed particles of a polyolefin resin are produced by dispersing starting particles of the polyolefin resin, which contains a volatile foaming agent, in a dispersant in a pressure vessel, heating the resultant dispersion to a temperature of at least t... | 12/26/1989 |
| 4886701 | Process for producing a tangled fibre material from glass fibres and polymer for the production of glass fibre-reinforced plastic mouldings and apparatus for performing the process A tangled fibrous material from cut glass fibre bundles, with the cut glass fiber bundler being fed into a compressed air flow and a glass fibre-laden air being deflected into a turbulent eddy flow of varying direction, so that a tangled fibrous material ... | 12/12/1989 |
| 4885125 | Method for in-mold polymerization of unsaturated compound An unsaturated compound having a vinyl or vinylidene group is rapidly in-mold polymerized by mixing the unsaturated compound containing a polymerization initiator and the unsaturated compound containing a polymerization accelerator, pouring the mixture in... | 12/05/1989 |
| 4885196 | Three-layer cross-laminated film with foam core made by counter-rotating dies A high-strength cross-laminated film with a foam core, particularly a cross-laminated film made by counter-rotating dies, and a method of producing the laminated film. The high-strength cross-laminated tubular film web is produced by counter-rotating dies... | 12/05/1989 |
| 4885317 | Press forming process and apparatus for plastic foam and plastic foam product Polymerized foam material in flat billet form is enclosed in a heat-retaining envelope and heated to forming temperature then promptly loaded into an innovative unheated forming press and accurately formed before cooling below forming temperature. The hea... | 12/05/1989 |
| 4883618 | Absorbable nerve repair device and method Medical devices for the sutureless repair of lacerated, severed, or grafted nerves comprising longitudinally-openable, porous, rough-surfaced tubes of a body-absorbable polymer are disclosed. The tubular devices of the invention are prepared by sintering ... | 11/28/1989 |
| 4883716 | Method for manufacture of cast fluoropolymer-containing films at high productivity 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 ca... | 11/28/1989 |
| 4882107 | Mold release coating process and apparatus using a supercritical fluid A process which comprises (i) the generation of release surfaces by application to predetermined areas of a solid surface of a solution, suspension or dispersion of a release agent and a supercritical fluid that vaporizes from the release agent, (ii) the ... | 11/21/1989 |
| 4882108 | Method for producing polypropylene foam A method of producing a crosslinked, uniformly foamed article of a polypropylene resin is provided. The polypropylene resin containing a crosslinking agent and a foaming agent is extruded through a long-land die which is provided with a choking die at an ... | 11/21/1989 |
| 4879036 | Asymmetrical membrane of polyester-amide and process for preparing it An asymmetrical membrane for use in dialysis and ultra-filtration is prepared using a polyester-amide (TATE)n, wherein T represents a radical of terephthalic acid, A represents a radical of hexamethylenediamine, and E represents a radical of he... | 11/07/1989 |
| 4877814 | Process for producing open-cell polyethylene foam materials and the resultant product This disclosure relates to a method for producing polyethylene open-cell foam materials, comprising a process step of pressurized heating at a temperature of 110° to 135° C. of a base compound consisting of polyethylene or a copolymer of polyethylene wh... | 10/31/1989 |
| 4877564 | Method and apparatus for measuring and controlling blow-up of a foam sheet in a thermoformer oven A method and an apparatus for measuring and controlling foam sheet blow-up in a thermoformer oven. Control of the oven operation is achieved through monitoring the measured blow-up of a material in the thermoformer oven at a sensing location in a forming ... | 10/31/1989 |
| 4876055 | Shaping of syntactic foam A method of forming a shaped article from a stock of preformed, thermoplastic, syntactic foam material of hollow microspheres in a thermoplastic polymer matrix, comprising heating the preformed syntactic foam to a temperature above the softening point of ... | 10/24/1989 |
| 4876049 | Method for preparing molded articles of ultra-high molecular weight polyethylene The present invention provides a method for preparing a molded article of an ultra-high molecular weight polyethylene which is characterized by compression-molding, or heating and pressurizing a porous sheet of said ultra-high molecular weight polyethylen... | 10/24/1989 |
| 4874649 | Process for producing hollow bodies of thermoplastic material In a process for producing a hollow body with a wall which partially comprises foamed thermoplastic material by an extrusion blow molding procedure, a preform which comprises at least first and second layers of which at least one comprises foamable plasti... | 10/17/1989 |
| 4874657 | Methods of producing biaxially-oriented polymer product, and the product produced thereby In accordance with the instant invention, biaxially-oriented polymer sheet is produced by continuously forging polymer feedstock between pairs of converging opposed surfaces. After it is biaxially-oriented, the sheet product is either cooled or heated whi... | 10/17/1989 |
| 4873032 | Pour hole closer, straight in type, for use with injection foam molding system A pour hole closure for use with an injection foam molding system including a mold assembly having a pour bushing leading to a reaction chamber. A cylinder having a slightly oversized plastic plug extending downwardly therefrom is normally positioned abov... | 10/10/1989 |
| 4872888 | Microporous membrane filter and method of producing same A process for producing a filter including a microporous membrane and a supporting structure connected thereto, including producing a mold for the membrane and the supporting structure, filling the mold with a molding material whose solubility can be chan... | 10/10/1989 |
| 4869857 | Process for producing porous membranes Porous membranes are produced by dissolving a film-forming polymer in a good solvent for the polymer, forming a film of the resulting polymer solution, and forcibly contacting saturated steam or mist-containing steam with at least one surface of said film... | 09/26/1989 |
| 4865739 | Process for producing a porous mineral membrane on a mineral support The invention relates to a process for preparing mineral and in particular, carbon-containing membranes on a porous mineral support. According to the process, at least one layer of a stable emulsion of mineral particles in a solution containing a thermose... | 09/12/1989 |
| 4865783 | Method of manufacturing a reusable mold A method for the manufacture of a mold out of mold material from a previous blank by machining each blank into a desired shape by means of a machine tool controlled by a computer utilizing a dimensioning data set. Each blank is manufactured by feeding an ... | 09/12/1989 |
| 4866117 | Deep drawing process of resin sheet A deep drawing process, comprising melt-softening a resin sheet obtained from a resin composition comprising: (a) from 15 to 82% by weight of a propylene-series resin, (b) from 15 to 82% by weight of an ethylene-series resin, and (c) from 3 to 50% by weight of carb... | 09/12/1989 |
| 4865786 | Foamed synthetic fiber and its manufacturing method Disclosed is a foamed synthetic fiber characterized in that an organic solvent solution of a thermoplastic polymer admixed with 3-100 weight percent of a compound scarcely soluble or insoluble in the aqueous coagulating bath for wet spinning, which is liq... | 09/12/1989 |
| 4861531 | Process for production of expansion-molded articles in a mold of linear low density polyethylene resins The present invention provides a process for production of expansion-molded articles in a mold of a linear low density polyethylene resin which comprises compressing pre-expanded linear low density polyethylene resin beads having two melting points when m... | 08/29/1989 |
| 4859339 | Microporous membranes of syndiotactic vinylaromatic polymers Microporous, asymmetric membranes comprising syndiotactic vinylaromatic polymers having utility as membranes for ultrafiltration or reverse osmosis and a process for their production.... | 08/22/1989 |
| 4859519 | Method and apparatus for preparing textured apertured film Apertured polymeric films for use as a liquid permeable facing material on absorbent products such as diapers and sanitary napkins is textured by a dual embossing process. The film is preferably embossed first with a pronounced, textile-like pattern, then... | 08/22/1989 |
| 4858629 | Increased volume synthetic fibres, procedure for producing them and their use, in particular for filters An increased volume synthetic fiber consists of a porous central core and a large number of short porous lateral threads integral with the core and distributed along the whole length of the fiber so as to form a voluminous branching structure. The process... | 08/22/1989 |
| 4857248 | Method of manufacturing cosmetic puff and manufacturing framework for use in the method A method of manufacturing a cosmetic puff for liquid foundation includes forming a latex film coating on one side of a crimp pattern plate by applying a latex film compound thereon. The latex film coated plates are set in a manufacturing framework. The fo... | 08/15/1989 |
| 4857252 | Fiberboard shims containing blocked isocyanates Fiberboard shims are manufactured which contain blocked isocyanates. The blocked isocyanates are blended with the other shim components to ensure complete distribution of the isocyanate into the shim, thereby improving the strength characteristics of the ... | 08/15/1989 |
| 4857255 | Poly-p-phenylene-terephthalamide film and process for producing the same 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 bo... | 08/15/1989 |
| 4857390 | Low density extruded foam having high compressive strength A low density extruded structural foam of closed cell structure having good compressive strength comprising a engineered thermoplastic resin, alone, or containing a flame retarding agent and/or nucleating agent, optionally combined with a vinyl aromatic r... | 08/15/1989 |
| 4851167 | Molding process and apparatus A flow molding process and associated molding apparatus for making plastic parts employing a radio-frequency heating field. In a two-piece mold, a diaphragm is supported thereacross and over a foam plastic compound that is disposed in the bottom half of t... | 07/25/1989 |
| 4849457 | Method of producing plastic sheet with porous surface A method of producing a plastic sheet with a porous surface layer suitable for use as, for example, a recording medium on which characters and images are printed by ink jet or thermal-transfer printing method. The method comprises preparing a solution by ... | 07/18/1989 |
| 4849144 | Process for making a separator for an electrochemical device A polymeric component, for use as a separator in an electrochemical device in which the anode comprises metallic lithium, comprises a thermoplastic polymer, a tertiary plasticizer and a filler that comprises a lithium compound which is substantially insol... | 07/18/1989 |
