Copolyamide acid and copolyimide

Details Copolyamide acid and copolyimide Copolyamide acid and copolyimide

1983-04-06

1984-03-20

Lee, Lester L.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528353, C08G 7310

Patent

active

044382561

ABSTRACT:
A copolyamide acid comprising repeating units represented by the general formulas: ##STR1## in which the repeating unit (A) and the repeating unit (B) are present in a molar ratio from 20:80 to 80:20, and which has a logarithmic viscosity number (.eta..sub.inh) of 0.5 dl/g--10 dl/g measured in N,N-dimethylformamide at a concentration of 0.5 g/dl and at a temperature of 30.degree. C. and a copolyimide comprising repeating units represented by the general formulas: ##STR2## in which the repeating unit (C) and the repeating unit (D) are present in a molar ratio from 20:80 to 80:20 and which has a logarithmic viscosity number (.eta..sub.inh) of o.5 dl/g--10 dl/g measured in 97% concentrated sulfuric acid at a concentration of 0.5 g/dl and at a temperature of 30.degree. C.

REFERENCES:
patent: 3179630 (1965-04-01), Endrey
patent: 3179632 (1965-04-01), Hendrix
patent: 3415782 (1968-12-01), Irwin et al.
patent: 3424718 (1969-01-01), Angelo
patent: 3870677 (1975-03-01), Farrissey, Jr.
patent: 4269968 (1981-05-01), Duran et al.
patent: 4358581 (1982-11-01), Sutton, Jr.
patent: 4378400 (1983-03-01), Makino et al.

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