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Class Information
Number: 521/138
Name: Synthetic resins or natural rubbers -- part of the class 520 series > Synthetic resins (class 520, subclass 1) > Cellular products or processes of preparing a cellular product, e.g., foams, pores, channels, etc. > Cellular product derived from two or more solid polymers or from at least one solid polymer and at least one polymer-forming system > At least one polymer is derived from a polycarboxylic acid or derivative and a polyol or wherein the polymer-forming system containing the same type of reactants
Description: Subject matter wherein at least one of the polymers is the reaction product of a polycarboxylic acid or derivative and a polyol.










Patents under this class:
1 2 3 4 5 6 7

Patent Number Title Of Patent Date Issued
4999384 Foamed blends of nylon 6,I/T and polycarbonate Mar. 12, 1991
4988740 Low density foamed thermoplastic elastomers Jan. 29, 1991
4985468 Porous material and its preparation Jan. 15, 1991
4983293 Semipermeable membrane and process for preparing same Jan. 8, 1991
4957942 Semipermeable membrane and process for preparing same Sep. 18, 1990
4954256 Hydrophobic membranes Sep. 4, 1990
4946884 Blends of poly(propylene carbonate) and poly(methyl methacrylate) and their use in decomposition molding Aug. 7, 1990
4940844 Polyol-alkali metal silicate emulsion Jul. 10, 1990
4940732 Dispersions and the preparation of foamed resins therefrom Jul. 10, 1990
4940733 Method for foaming high temperature polymers using poly(alkylene carbonates) as foaming agents Jul. 10, 1990
4939182 Melamine-alkanolamine condensates and polyurethanes prepared therefrom Jul. 3, 1990
4939183 Elastomeric membrane and its method of manufacture Jul. 3, 1990
4931490 Expandable polymer concretes and mortars utilizing low cure temperature polymers Jun. 5, 1990
4918113 Production of plastic foam material Apr. 17, 1990
4892854 Dispersions and the preparation of foamed resins therefrom Jan. 9, 1990
4886839 Mineral filler fire retardant compositoin and method Dec. 12, 1989
4876291 Mineral filler fire retardant composition and method Oct. 24, 1989
4871784 Minute-cellular polyester film Oct. 3, 1989
4851453 Foamable molding compositions Jul. 25, 1989
4842740 Membranes prepared from blend of polybenzimidazole with polyarylates Jun. 27, 1989
4837243 Foamable molding compositions Jun. 6, 1989
4833174 Wood-like polymeric composition May. 23, 1989
4829093 Oil-containing resin and its composition May. 9, 1989
4824871 Electrically conductive polymer composite and method of making same Apr. 25, 1989
4801624 Molding of ceramic materials Jan. 31, 1989
4798851 Process for the preparation of elastic, noncellular or cellular polyurethane- or polyurethane-polyurea molded articles Jan. 17, 1989
4798850 Blended-fibre filter material Jan. 17, 1989
4797428 Foam systems and ASTM E-84 class 1 rated foams produced therefrom Jan. 10, 1989
4794128 Porous film Dec. 27, 1988
4785026 Polymer polyols with high solids content Nov. 15, 1988
4780483 Wood-like polymeric composition Oct. 25, 1988
4751250 Process for foaming thermoplastic Jun. 14, 1988
4743417 Method for the manufacture of product comprising foamed plastic material and using a low-pressure chamber May. 10, 1988
4742087 Polyurethane prepolymers based on oleochemical polyols, their production and use May. 3, 1988
4737523 Foamable molding compositions Apr. 12, 1988
4727092 Molding of ceramic materials Feb. 23, 1988
4714718 Nylon moldings and their production Dec. 22, 1987
4711909 New dispersions and the preparation of foamed resins therefrom Dec. 8, 1987
4710522 Foamable composition and process for forming same Dec. 1, 1987
4708977 Fire retardant plastics material Nov. 24, 1987
4692427 Dispersions and the preparation of foamed resins therefrom Sep. 8, 1987
4692269 Gas-releasing composition for tailoring gas evolution of system Sep. 8, 1987
4689352 Production of plastic foam material with gas-release control agent Aug. 25, 1987
4683247 Foamable thermoplastic compositions, foamed articles and foaming method based on pre-compounded nucleating agent-resin concentrate Jul. 28, 1987
4640934 Process for the preparation of cellular products and laminates based on furan prepolymers Feb. 3, 1987
4636528 Foaming of unsaturated polyester resin at elevated temperatures Jan. 13, 1987
4636526 Composites of unsintered calcium phosphates and synthetic biodegradable polymers useful as hard tissue prosthetics Jan. 13, 1987
4632869 Resin composition, opaque film and method of preparing same Dec. 30, 1986
4623478 Composition and method for making foamed polyester resin Nov. 18, 1986
4616042 Low temperature impact modified thermoplastic foam Oct. 7, 1986

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