Process for the production of polycondensate containing cyclic i

Details Process for the production of polycondensate containing cyclic i Process for the production of polycondensate containing cyclic i

1978-05-15

1980-02-05

Lee, Lester L.

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 49, 528 52, 528 73, C08G 1800, C08G 7310

Patent

active

041873653

ABSTRACT:
A process for the production of polycondensates linked by cyclic imide groups, wherein at least one organic polyisocyanate or masked isocyanate, formic acid and at least one cyclic dicarboxylic acid anhydride compound which, in addition to the cyclic anhydride group, is substituted at least once by another cyclic anhydride, carboxyl, carbalkoxy, carbaroxy or SO.sub.3 H group, are polycondensed at temperatures in the range from 0.degree. to 450.degree. C.

REFERENCES:
patent: 3578639 (1971-05-01), Sheffer
patent: 3914505 (1975-10-01), Dacloux

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