Patent ID: 8168293

Claim:
A formulation for a cellular, foamed-polymer product, based on polyvinyl chloride, consisting of: a polyvinyl chloride homopolymer having a K-value of from 60 to 85 and a pH value of the aqueous extract ranging of from 8 to 12; at least one isocyanate selected from the group consisting of isomers and homologues of diphenylmethane-4,4′-diisocyanate, modified diphenylmethane-4,4′-diisocyanates and mixtures thereof; at least one anhydride selected from the group consisting of succinic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methyl-tetrahydrophthalic anhydride, 4-methyl-hexahydrophthalic anhydride, cyclohexane-1,2-dicarboxylic anhydride, methyl-endomethylene tetrahydrophthalic anhydride, dodecenyl succinic anhydride, trimellitic anhydride and mixtures thereof; at least a surfactant where the surfactant is a silicone polyether graft copolymer; and at least a foaming agent.