Dense, flexible composite sheet material

Abstract

A composite material comprising a fibrous sheet which is impregnated with a polyurethane elastomer. The polyurethane elastomer comprises the reaction product of (A) a polymeric diol having a molecular weight of about 800-4000; (B) an organic diisocyanate having the formula (I) ##STR1## wherein R' and R.sup.2 are hydrogen or an alkyl group having 1-5 carbon atoms, respectively, and (C) a chain extender comprising an organic diamine having the formula (II) ##STR2## wherein R' and R.sup.2 are hydrogen or 40-95 mole % alkyl group having 1-5 carbon atoms, respectively, and a phthalic acid dihydrazide having the formula (III) ##STR3## This composite sheet material is useful as a synthetic leather, especially as a suede-like leather sheet material, and has high density, good flexiblity and crease resistance, a supple touch and 60-5 mole % pertinent rubber-like repulsive elasticity.

Dependencies are inferred from the claim text.