Low-melting polyimide copolymer and method for preparing the sam

Details Low-melting polyimide copolymer and method for preparing the sam Low-melting polyimide copolymer and method for preparing the sam

1989-01-05

1990-02-27

Kight, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528128, 528172, 528183, 528188, 528189, C08G 6926

Patent

active

049047582

ABSTRACT:
The present invention is connected with a low-melting polyimide copolymer containing 30 to 90 mole % of an imide repeating unit represented by the following formula (I) and 10 to 70 mole % of an imide repeating unit represented by the following formula (II), and having a logarithmic viscosity number of 0.1 to 4 dl/g: ##STR1## wherein R.sup.1 is at least one of ##STR2## Furthermore, the present invention is connected with a method of preparing the low-melting polyimide copolymer.
Since having a melting point of about 300.degree. to about 400.degree. C., the polyimide copolymer of the present invention has heat resistance and enables melt-moldings such as extrusion and injection molding.

REFERENCES:
patent: 3998786 (1976-12-01), D'Alelio
patent: 4316844 (1982-02-01), Waitkus
patent: 4568715 (1986-02-01), Itatani et al.
Patent Abstracts of Japan, vol. 12, No. 482.

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