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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
5482977 Foamable branched polyesters Jan. 9, 1996
5475037 Amorphous polyester foam Dec. 12, 1995
5462973 Separation of polyethylene terephthalate and polyvinyl chloride using supercritical carbon dioxide Oct. 31, 1995
5461083 Formed plastic and method of manufacturing the same Oct. 24, 1995
5434194 Method for making a cellular rubber, cellular rubbers obtained by the method, and cosmetic puffs made of the cellular rubber Jul. 18, 1995
5429869 Composition of expanded polytetrafluoroethylene and similar polymers and method for producing same Jul. 4, 1995
5422381 Foamed cellular polyester resins and process for their preparation Jun. 6, 1995
5397810 Polyol, polyurethane resin and utilization thereof Mar. 14, 1995
5391582 Poly(ethylene terephthalate) foams comprising recycled plastic and methods relating thereto Feb. 21, 1995
5378792 Foamed polylactide moldings and production thereof Jan. 3, 1995
5369135 Controlled microcellular foams of crystalline amorphous polymers Nov. 29, 1994
5360829 Foamed polyester sheet and process for the production thereof Nov. 1, 1994
5340846 Increased throughput in melt fabrication and foaming of polyester Aug. 23, 1994
5314925 Use of polytetrafluoroethylene resins as a nucleating agent for foam molded thermoplastics May. 24, 1994
5312846 Cellular polymer containing perforated cell windows and a process for the preparation thereof May. 17, 1994
5310799 Aromatic polyester melt strength improver May. 10, 1994
5288764 Increased throughput in foaming and other melt fabrication of polyester Feb. 22, 1994
5286382 Hydrophobic polymeric membrane composites Feb. 15, 1994
5281632 Cellular polymer containing perforated cell windows and a process for the preparation thereof Jan. 25, 1994
5272182 Blowing agent concentrate and compositions and article prepared therefrom Dec. 21, 1993
5250579 Cellular polymer containing perforated cell windows and a process for the preparation thereof Oct. 5, 1993
5246973 Foamable silicone rubber composition Sep. 21, 1993
5244932 Polymer polyol dispersions, a process for making them and polyurethane foams prepared using such polyol dispersions Sep. 14, 1993
5240968 Carbon black-containing bimodal foam structures and process for making Aug. 31, 1993
5223550 Fine polybenzimidazole-containing particles Jun. 29, 1993
5217802 Hydrophobic polymeric membrane composites Jun. 8, 1993
5210108 Degradable foam materials May. 11, 1993
5210105 Carbon black-containing bimodal foam structures and process for making May. 11, 1993
5200432 Polyphenylene oxide-recycled polystyrene composition and method Apr. 6, 1993
5162280 Aqueous dispersions of aromatic diacyl peroxides Nov. 10, 1992
5137933 Foamable resin composition Aug. 11, 1992
5134170 Acrylic rubber composition Jul. 28, 1992
5126380 Use of polyarylene sulphides for the production of a structural foam resistant to high temperatures, process for the preparation of this foam, and mouldings obtainable by this process Jun. 30, 1992
5124098 Process for producing foam fiber Jun. 23, 1992
5120769 Process for the preparation of thermoplastic syntactic foam and thermoplastic powder compositions suitable therefor Jun. 9, 1992
5116880 Biodisintegrable thermoplastic resin foam and a process for producing same May. 26, 1992
5114983 Use of polyarylene sulphides for the production of a structural foam resistant to high temperatures, process for the preparation of this foam, and moldings obtainable by this process May. 19, 1992
5115073 Rapidly crystallizing polyurethane systems May. 19, 1992
5110838 Biodisintegrable thermoplastic resin foam and a process for producing same May. 5, 1992
5086083 Dialkyl dicarbonates as blowing agents for polymers Feb. 4, 1992
5084334 Void-containing polyester-type film, and its laminate Jan. 28, 1992
5081161 Process for making shaped articles of a thermoplastic resin having a microcellular structure Jan. 14, 1992
5075417 Polyester polyols from tall oil fatty acid, maleic anhydride, and aromatic polyester polyols Dec. 24, 1991
5059637 Endothermic fire protective material Oct. 22, 1991
5059630 Methods for manufacture of porous resin moldings, ultrafine fibers and ultrafine fiber nonwoven fabrics Oct. 22, 1991
5057479 Aqueous dispersions of aromatic diacyl peroxides Oct. 15, 1991
5055494 Method of improving the resistance of polyphenylene ether articles to sunlight, and articles improved by this method Oct. 8, 1991
5017622 Sulfone polymer foam produced with aqueous blowing agent May. 21, 1991
5010111 Flame resistant, expandable styrene polymers and foams, and flame retardants Apr. 23, 1991
5000991 Process for producing polyester resin foam and polyester resin foam sheet Mar. 19, 1991

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