Process for rigid polyurethane foams

Details Process for rigid polyurethane foams Process for rigid polyurethane foams

C - Chemistry, Metallurgy

08

J

C08J 9/14 (2006.01) C08L 75/04 (2006.01)

Patent

CA 2157271

Process for the preparation of a rigid polyurethane or urethane-modified polyisocyanurate foam in the presence of a blowing agent mixture comprising cyclopentane and a certain amount of other organic compounds as co-blowing agents, the saturated vapour pressure of said co-blowing agents in bar at T use (v.p.) complying with die following equation (I): v.p. >= 0.7 bar × T use/298 °K x C/100 wherein C is the mole % of said co-blowing agent in gaseous form on the total blowing agent mixture in the gaseous phase after foaming and T use is the temperature in °K at which the foam is used.

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