Method for the preparation of thin polyimide film

Details Method for the preparation of thin polyimide film Method for the preparation of thin polyimide film

1984-06-20

1986-05-20

Page, Thurman K.

Coating processes

With post-treatment of coating or coating material

Heating or drying

4273855, 4273897, B05D 302

Patent

active

045901031

ABSTRACT:
The invention relates to a method for the preparation of thin polyimide layers by applying a solution of a polyimide prepolymer to a substrate, and subsequently annealing, and has as its object the provision of a method of this type in such a way that the preparation of layers with layer thicknesses of .ltoreq.0.2 .mu.m is made possible which layers have a homogeneous character and exhibit good adhesion. For this purpose, the invention provides that film-forming prepolymers of highly heat-resistant polyimides are used which prepolymers give off a high percentage of volatile products in annealing. The method according to the invention is particularly suitable for the production of orientation layers for liquid-crystal displays.

REFERENCES:
patent: 3558350 (1971-01-01), Fincke et al.
patent: 3666528 (1972-05-01), Barnhardt
patent: 3957512 (1976-05-01), Kleeberg et al.
patent: 4048144 (1977-09-01), Stephens
patent: 4068923 (1978-01-01), Toida
patent: 4405770 (1983-09-01), Schoenberg et al.

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