Process for rigid polyurethane foams

Details Process for rigid polyurethane foams Process for rigid polyurethane foams

1994-03-11

1995-08-22

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521155, C08J 914

Patent

active

054441013

ABSTRACT:
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 amounts of other organic compounds as co-blowing agenrts, the the saturated vapour pressure of said co-blowing agents in bar at T.sub.use (v.p.) complying with the following equation (I) ##EQU1## 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.sub.use is the temperature in .degree.K. at which the foam is used.

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