Process for the production of hard polyurethane foams

Details Process for the production of hard polyurethane foams Process for the production of hard polyurethane foams

C - Chemistry, Metallurgy

08

G

C08G 18/48 (2006.01) C08G 18/50 (2006.01) C08J 9/14 (2006.01) C08L 75/04 (2006.01)

Patent

CA 2141735

Rigid polyurethane foams are prepared by the reaction of 1) polyisocyanates with 2) compounds of a molecular weight of from 150 to 1500, having at least two hydrogen atoms active towards isocyanates and which one tertiary nitrogen atom is the molecule, in the presence of 3) hydrofluoroalkanes as foaming agents as well as optionally in the presence of 4) other auxiliary substances and additives known per se.

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