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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
4016112 Process for production of foamed resin structure Apr. 5, 1977
4011195 Polymerizable compositions containing unsaturated polyester resins and aqueous alkali metal silicate, method of preparing shaped articles from such compositions and thermoset products thereof Mar. 8, 1977
4007141 Opaque, non-pigmented microporous film and process and composition for preparing same Feb. 8, 1977
4002581 Foamed thermoplastic compositions of a linear polyester and an ionically crosslinked copolymer Jan. 11, 1977
3993609 Process for preparing foamed structures Nov. 23, 1976
3979342 Manufacture of vesiculated polymer granules Sep. 7, 1976
3975348 Water-extended polyesteramide resins and methods for their production Aug. 17, 1976
3957651 Microporous polyester membranes and polymer assisted phase inversion process for their manufacture May. 18, 1976
3954274 Clay tile pipe joint seal containing foamed unsaturated polyester resin May. 4, 1976
3945955 Plasticized polyvinyl chloride compositions containing silicone frothing agents Mar. 23, 1976
3940349 Compositions and process for making rigid plastic foams of modified vinyl ester resins and silicone compounds Feb. 24, 1976
3936400 Flame retardant foamed polyester compositions Feb. 3, 1976
3933689 Fire retardant compositions Jan. 20, 1976
3933579 Vesiculated polymer granules Jan. 20, 1976

1 2 3 4 5 6 7

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