Process for preparing foams from polyisocyanates and polyepoxide

Details Process for preparing foams from polyisocyanates and polyepoxide Process for preparing foams from polyisocyanates and polyepoxide

1977-03-16

1978-12-12

Cockeram, H.S.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521121, 521125, 521128, 521129, 521156, 521160, 521902, C08G 1814, C08G 1818, C08G 1822, C08G 1816

Patent

active

041296958

ABSTRACT:
Polymers comprising polyoxazolidone and carbodiimide recurring units of the formula: ##STR1## are prepared from polyisocyanates and polyepoxides. Non-friable, low density fire resistant foams are prepared directly from the polymers of the invention without the equisite addition of pore-forming agents.

REFERENCES:
patent: 2941966 (1960-06-01), Campbell
patent: 3020262 (1962-02-01), Speranza
patent: 3242103 (1966-03-01), Velzmann
patent: 3313747 (1967-04-01), Schramm
patent: 3673128 (1972-06-01), Hayash et al.
patent: 3694406 (1972-09-01), D'Alelio
patent: 3929733 (1975-12-01), Alberino et al.
patent: 3933699 (1976-01-01), Kan

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