Polymeric foams

Details Polymeric foams Polymeric foams

1993-03-19

1997-12-30

Sergent, Rabon

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521114, 521130, 521131, 521132, 521159, 521163, 521164, 521166, 521172, 521173, C08J 914, C08J 904, C08K 501, C08K 502

Patent

active

057031363

ABSTRACT:
A method for the preparation of rigid foams by reacting an organic polyisocyanate with an isocyanate-reactive material in the presence of a blowing promoter characterized in that the isocyanate-reactive material comprises at least one isocyanate-reactive cyclic carbonate or isocyanate-reactive cyclic urea, the reaction being performed in the presence of an inert insoluble organic liquid which is present as the disperse phase of an emulsion or a microemulsion, and in the presence of a metal salt catalyst.

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