Preparation process of polyimide film

Details Preparation process of polyimide film Preparation process of polyimide film

1990-07-06

1991-08-06

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

2642101, 26421118, 264216, 264237, 264348, B29C 7100

Patent

active

050375873

ABSTRACT:
In the preparation of a film by melt-extrusion process of thermoplastic polyimide, static charge is applied to a molten film, primary cooling is carried out by adhering the film to a cooling roller having a surface temperature in the range of from the glass transition temperature of said polyimide -50.degree. C. to the glass transition temperature -15.degree. C., the film is successively cooled to 60.degree. C. and less without bringing the film into contact with rollers, and is taken up under tension to give a polyimide film.

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