Colorless transparent polyimide shaped article and process for producing the same
AssigneeNitto Electric Industrial Co., Ltd.
InventorsKazumi Higashi, Yuzuru Noda
Life of this patent
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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.
Claims17
A colorless transparent polyimide shaped article comprising as a main component at least one recurring unit selected from the group consisting of a recurring unit of the formula (I) ##STR18## wherein X.sub.1 represents O, S, SO.sub.2, CH.sub.2, CF.sub.2, C(CH.sub.3).sub.2, C(CF.sub.3).sub.2 or CO;
- a recurring unit of the formula (II) ##STR19## wherein X.sub.2 represents SO.sub.2, C(CH.sub.3).sub.2 or C(CF.sub.3).sub.2 ;
- a recurring unit of the formula (III) ##STR20## wherein X.sub.3, X.sub.4, X.sub.5 and X.sub.6 which may be the same or different each represents H, F, Cl, CH.sub.3, C.sub.2 H.sub.5, NO.sub.2 or CF.sub.3 ;
- and a recurring unit of the formula (IV) ##STR21##
A process for producing a colorless polyimide shaped article, which comprises preparing a solution of
- (A) a polyamide acid comprising as a main component at least one recurring unit selected from the group consisting of a recurring unit of the formula (V) ##STR22## wherein X.sub.1 represents O, S, SO.sub.2, CF.sub.2, C(CH.sub.3).sub.2, C(CF.sub.3).sub.2 or CO;
- a recurring unit of the formula (VI) ##STR23## wherein X.sub.2 represents SO.sub.2, C(CH.sub.3).sub.2 or C(CF.sub.3).sub.2 ;
- a recurring unit of the formula (VII) ##STR24## wherein X.sub.3, X.sub.4, X.sub.5 and X.sub.6 which may be the same or different each represents H, F, Cl, CH.sub.3, C.sub.2 H.sub.5, NO.sub.2 or CF.sub.3 ;
- and a recurring unit of the formula (VIII) ##STR25## dissolved in (B) an amide-type organic polar solvent having a boiling point of 170.degree. C. or less;
- forming a shaped article of the polyamide acid from the solution;
- and
- imidizing the resulting shaped article of the polyamide acid.
A solution comprising
- (A) a polyamide acid comprising as in main component at least one recurring unit selected from the group consisting of a recurring unit of the formula (V) ##STR28## wherein X.sub.1 represents O, S, SO.sub.2, CF.sub.2, C(CH.sub.3).sub.2 or CO;
- a recurring unit of the formula (VI) ##STR29## wherein X.sub.2 represents SO.sub.2, C(CH.sub.3).sub.2 or C(CH.sub.3).sub.2) or C(CF.sub.3).sub.2 ;
- a recurring unit of the formula (VII) ##STR30## wherein X.sub.3, X.sub.4, X.sub.5 and X.sub.6 which may be the same or different each represents H, F, Cl, CH.sub.3, C.sub.2 H.sub.5, NO.sub.2 or CF.sub.3 ;
- and a recurring unit of the formula (VIII) ##STR31## and (B) an amide-type organic polar solvent having a boiling point of 170.degree. C. or less, (A) being dissolved in (B).
A colorless polyimide shaped article produced by the process which comprises preparing a solution of
- (A) a polyamide acid comprising as a main component at least one recurring unit selected from the group consisting of a recurring unit of the formula (V) ##STR32## wherein X.sub.1 represents O, S, SO.sub.2, CF.sub.2, C(CH.sub.3).sub.2, C(CF.sub.3).sub.2 or CO;
- a recurring unit of the formula (VI) ##STR33## wherein X.sub.2 represents SO.sub.2, C(CH.sub.3).sub.2 or C(CF.sub.3).sub.2 ;
- a recurring unit of the formula (VII) ##STR34## wherein X.sub.3, X.sub.4, X.sub.5 and X.sub.6 which may be the same or different each represents H, F, Cl, CH.sub.3, C.sub.2 H.sub.5, NO.sub.2 or CF.sub.3 ;
- and a recurring unit of the formula (VIII) ##STR35## dissolved in (B) an amide-type organic polar solvent having a boiling point of 170.degree. C. or less;
- forming a shaped article of the polyamide acid from the solution;
- and
- imidizing the resulting shaped article of the polyamide acid.
Dependencies are inferred from the claim text.