초록 ▼

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 proce

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.

대표청구항 ▼

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) [Figure] (I) wherein X1 represents O, S, SO2, CH2, CF2, C(CH3)2, C(CF3)2 or CO; a recurring unit of the formula (II) [

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) [Figure] (I) wherein X1 represents O, S, SO2, CH2, CF2, C(CH3)2, C(CF3)2 or CO; a recurring unit of the formula (II) [Figure] (II) [Figure] wherein X2 represents SO2, C(CH3)2 or C(CF3)2; a recurring unit of the formula (III) [Figure] (III) wherein X3, X4, X5 and X6 which may be the same or different each represents H, F, Cl, CH3, C2H5, NO2 or CF3; and a recurring unit of the formula (IV) [Figure] (IV) [Figure]