Preparation of cellular polyurethane elastomers using polyether carbonate diols as a starting component

Claim 1

A process for the preparation of a cellular polyurethane elastomer by reacting a) an organic and/or modified organic polyisocyanate with b) at least one relatively high-molecular-weight polyhydroxyl compound and, if desired, c) a low-molecular-weight chain extender and/or crosslinking agent, in the presence of d) a blowing agent, e) a catalyst and f) optionally additives and/or assistants, wherein the relatively high-molecular-weight polyhydroxyl compound (b) is a polyether polycarbonate diol prepared by polycondensing b1) a polyoxytetramethylene glycol having a mean molecular weight Mn (number average) of from 150 to 500 or b2) a mixture comprising b2i) at least 10 mol-% of the polyoxytetramethylene glycol (b1) and b2ii) less than 90 mol-% of at least one polyoxyalkylene diol, other than (b1), comprising an alkylene oxide having 2 to 4 carbon atoms in the alkylene radical, at least one linear or branched alkanediol having 2 to 14 carbon atoms or at least one cyclic alkanediol having 3 to 15 carbon atoms or a mixture of at least two of said diols (b2ii) with b3) phosgene, diphenyl carbonate or a dialkyl carbonate containing C 1 - to C 4 -alkyl groups.