Production of heat-shrinkable polyimide films

Details Production of heat-shrinkable polyimide films Production of heat-shrinkable polyimide films

1983-04-04

1985-02-12

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642884, 2642902, 528353, B29D 702

Patent

active

044990421

ABSTRACT:
A heat-shrinkable polyimide film which comprises a polyimide film prepared by converting at least about 50% by weight of polyamide acid obtained by reacting a biphenyltetracarboxylic acid dianhydride represented by the general formula ##STR1## with an aromatic diamine into polyimide, and stretched in at least one direction to provide heat-shrinkability, and a process for producing the film.

REFERENCES:
patent: 3528937 (1970-09-01), Reynolds et al.
patent: 3835120 (1974-09-01), Bach et al.
patent: 4290936 (1981-09-01), Sosaki et al.
Encyclopedia of Polymer Science and Technology, Mark et al., Wiley & Sons, NYC, vol. 2, pp. 339-345.

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