Preparation of storage-stable, moisture-cured, single-component polyurethane systems and their uses

Claim 1

A storage-stable, moisture cured, single-component polyurethane system, comprising: (a) a polyurethane prepolymer having an NCO content of from about 1 to 10 weight percent, prepared by the reaction of higher molecular weight polyols and an aromatic polyisocyanate; (b) at least one polyaldimine having the structural formula ##STR13## and mixtures thereof, in which R is selected from the group consisting of a linear or branched, multivalent hydrocarbon radical having from 2 to 16 carbon atoms, linear or branched, multivalent, hydrocarbon radical containing in bonded form oxy groups as bridge members, having from about 4 to 16 carbon atoms, a cycloalkylene radical having from about 6 to 20 carbon atoms, a multivalent polyoxyalkylene radical having the following structural formulas: ##STR14## and mixtures thereof, in which M is the hydroxyl group-free radical of an initiator molecule, R 5 is a hydrogen atom, methyl group, ethyl group and mixtures thereof, and m is a whole number of from 1 to 25, wherein R 1 and R 2 are the same or different, linear or branched alkyl groups having from 1 to 6 carbon atoms or are a cycloalkyl group, R 3 is ##STR15## radical, wherein R 6 is a linear or branched alkyl group having from 1 to 10 carbon atoms or a cycloalkyl group, and R 7 is the same as R 6 or is a linear or branched oxyalkyl radical having from 1 to 10 carbon atoms, R 4 , R 3 and R 7 are a hydrogen atom or the radical ##STR16## wherein R 8 is ##STR17## and R 9 is an aromatic radical having from about 6 to 15 carbon atoms, and n is a whole number of from 2 to 8.