Polymide compositions

Details Polymide compositions Polymide compositions

1990-09-26

1992-05-12

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528126, 528128, 528170, 528171, 528172, 528173, 528175, 528176, 528179, 528185, 528188, 528189, 528220, 528229, 528350, 528351, 528352, C08G 6926, C08G 6928, C08G 802, C08G 1400

Patent

active

051129426

ABSTRACT:
Copolyimides and their precursors are disclosed comprising units represented by the formula ##STR1## where R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are the same or different and are hydrogen or C.sub.1 to C.sub.6 linear or branched alkyl, with the proviso that R.sub.1, R.sub.2, R.sub.3 and R.sub.4 cannot simultaneously be hydrogen and where Z is a chemical bond, ##STR2## Ar is the tetravalent residue of a tetracarboxylic acid or acid dianhydride or di- or tetraester thereof, where x and y are integers from about 100 to about 1,000, and the ratio of x to y is from about 1:99 to about 49:51, and z is 0-5.
These copolymers have improved resistance to stress cracking. They may also be used in applications such as coatings, or adhesives.

REFERENCES:
patent: 3766138 (1973-10-01), Crivello
patent: 4675366 (1987-06-01), Evans et al.
patent: 4837300 (1989-06-01), St. Clair et al.
patent: 4851505 (1989-07-01), Hayes

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