Storage stable polyurethane compositions

Claim 1

An organic polyurethane composition having a solids content of about 10 to 100 weight percent which comprises (1) isocyanate-terminated polyurethanes which are prepared by reacting (a) reaction products of the phosgenation of aniline-formaldehyde condensates containing, based on the total weight of component (a), (i) about 0 to 10 weight percent of 2,2'-diphenylmethane diisocyanate, (ii) about 10 to 40 weight percent of 2,4'-diphenylmethane diisocyanate, (iii) about 30 to 60 weight percent of 4,4'-diphenylmethane diisocyanate and (iv) about 25 to 60 weight percent of polymeric isocyanates having 3 or more isocyanate groups; with (b) a polyol component comprising (i) a polyether polyol with an average molecular weight of less than about 10,000 and which contains at least two hydroxyl groups and at least one tertiary nitrogen atom and which has at least 5 ether groups between the tertiary nitrogen atom and the hydroxyl groups, and optionally (ii) an additional polyol with an average molecular weight of less than about 10,000 and which contains at least two hydroxyl groups and does not contain a tertiary nitrogen atom, wherein the polyol component (b) contains about 20 to 100 weight percent of component (i) and about 0 to 80 weight percent of component (ii) and wherein the quantities of (a) and (b) are chosen to provide component (1) with an isocyanate content of about 5 to 30 weight percent based on the total weight of component (1) and a viscosity of about 2,500 to 6,500 cps; and, optionally (2) a monoisocyanate comprising a member selected from the group consisting of para-toluene-sulfonyl isocyanate and the reaction product of 2,4-toluene diisocyanate or 2,6-toluene diisocyanate with an alcohol of the formula R 1 OH wherein R 1 represents a hydrocarbon group having from 1-18 carbon atoms optionally interrupted by ether groups, wherein up to about 50% by weight of component (2) is used based on the weight of component (1).