Colorless transparent polyimide shaped article and process for p

Details Colorless transparent polyimide shaped article and process for p Colorless transparent polyimide shaped article and process for p

1986-03-10

1989-10-24

Kight, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528126, 528128, 528172, 528187, 528188, 528229, C08G 6926

Patent

active

048763306

ABSTRACT:
A colorless transparent polyimide shaped article having as a main component at least one recurring unit selected from the recurring units of the formulae (I) to (IX). It is useful, for example, as an oriented film in liquid crystal display devices. The polyimide shaped article is produced by a process which comprises preparing a solution of a polyamide acid having as a main component at least one recurring unit selected from the recurring units of the formulae (V) to (VIII) in an amide-type organic polar solvent, forming a shaped article of the polyamide acid from the solution, and imidizing the resulting shaped article of the polyamide acid.

REFERENCES:
patent: 4239880 (1980-12-01), Darms
patent: 4378400 (1983-03-01), Makino et al.
patent: 4438256 (1984-03-01), Ohta et al.
patent: 4499042 (1985-02-01), Ishizuka et al.
Chemical Abstract, vol. 80, No. 24, Item 134191y, referring to Japanese Document 73 18,960 (Miyadera) published Jun. 9, 1973.

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