Preparation of polyurethane rigid foams

Details Preparation of polyurethane rigid foams Preparation of polyurethane rigid foams

C - Chemistry, Metallurgy

08

G

C08G 18/66 (2006.01) C08G 18/48 (2006.01) C08J 9/14 (2006.01) C08L 75/08 (2006.01)

Patent

CA 2165614

A process for producing polyurethane rigid foams comprises react- ing a) organic polyisocyanates b) relatively high molecular weight compounds containing at least two reactive hydrogen atoms and, if desired, c) low molecular weight chain extenders and/or crosslinkers in the presence of d) blowing agents e) catalysts and, if desired, f) auxiliaries and additives, wherein the relatively high molecular weight compounds containing at least two reactive hydrogen atoms comprise a mixture of a1) one or more high-functional, polyether alcohols having func- tionalities of from 6 to 8 and mean equivalent masses of from 125 to 200, a2) one or more polyether alcohols based on aliphatic amines hav- ing functionalities of from 3 to 4 and mean equivalent masses of from 70 to 130, a3) one or more low-functional polyether alcohols having func- tionalities of from 2 to 3 and mean equivalent masses of from 67 to 250, and a4) an OH-containing fatty acid ester.

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