Preparation of polyurethane foams without using inert blowing ag

Details Preparation of polyurethane foams without using inert blowing ag Preparation of polyurethane foams without using inert blowing ag

1989-06-29

1990-08-21

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521137, 521176, C08G 1814

Patent

active

049506943

ABSTRACT:
A process for making low density and optionally low resilience, soft, flexible polyurethane slabstock foam having a substantially open cell structure without crushing, without requiring auxiliary inert blowing agents, by reacting under a condition which permits the foam to rise freely, a conventional hydroxyl-containing polyether polyol with a polyisocyanate at an isocyanate index of between about 60 and 95 in the presence of a foam processing aid comprising a low equivalent weight crosslinking agent and/or extending agent and, as needed, a cell opening agent.

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