Patent ID: 6331577
Filing Date: 2001-12-18
Classification: C08G

Abstract:
A process for producing high elasticity polyurethane moldings having a compact surface and a cellular core comprising the step of reactinga) modified organic polyisocyanate withb) at least one compound containing at least two reactive hydrogen atoms and having a molecular weight of from 1000 to 8000, and optionallyc) chain extenders, in the presence ofd) blowing agents,e) catalysts and, if desired,f) auxiliaries and/or additives in a closed mold with compaction, wherein the modified organic polyisocyanate a) comprises the reaction product of 4,4'-diisocyanatodiphenylmethane with at least one polyoxypropylene polyol and/or polyoxypropylene-polyoxyethylene polyol, the modified organic polyisocyanate has an NCO content of <15% by weight, the chain extenders c) comprise diols having a molecular weight of <400, the weight ratio of a) to the sum of the components b) to f) in the reaction is greater than 1, the blowing agent d) comprises water, andwherein the components a) through f) are reacted in amounts sufficient to provide polyurethane moldings having a density below 400 grams per liter and a rebound resilience in accordance with DIN 53512 of at least 35%.