Poly(N-phenyl urethane) from poly(N-substituted iminocarbonate)

Details Poly(N-phenyl urethane) from poly(N-substituted iminocarbonate) Poly(N-phenyl urethane) from poly(N-substituted iminocarbonate)

1992-11-19

1993-09-07

Anderson, Harold D.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528 44, C08G 6700

Patent

active

052429970

ABSTRACT:
Poly(N-phenyl urethanes) and methods of preparing same by heating poly(N-phenyl iminocarbonates) to a temperature above 250.degree. C. so that the backbone of the polyiminocarbonate rearranges to form the poly(N-phenyl urethane). Poly(N-substituted iminocarbonates and methods of preparing same by suspending a dialkaline diphenol in an aprotic solvent at a basic pH and adding to the suspension an N-substituted iminophosgene. Methods for making heat-stable articles by forming an article from a poly(N-phenyl iminocarbonate) while heating the article to a temperature above about 250.degree. C. so that the poly(N-phenyl iminocarbonate) rearranges to form a poly(N-phenyl urethane).

REFERENCES:
patent: 5194570 (1993-03-01), Kohn et al.

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