Rigid polyurethane foams

Details Rigid polyurethane foams Rigid polyurethane foams

1993-09-09

1994-09-13

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521117, 521118, 521123, 521124, 521125, 521128, 521131, 521132, 521172, 521173, C08L 7504

Patent

active

053469283

ABSTRACT:
A process is provided for the preparation of rigid forms which comprises the step of reacting an organic polyisocyanate with an isocyanate-reactive material in the presence of a blowing promotor being an isocyanate-reactive cyclic compound of formula: ##STR1## wherein Y is O or NR.sup.1 wherein each R.sup.1 independently is a lower alkyl radical of C.sub.1 -C.sub.6 or a lower alkyl radical substituted with an isocyanate-reactive group;

REFERENCES:
patent: 3165483 (1985-01-01), Gemainhardt et al.

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