Substrate with a liquid crystal polymeric thin film and method for manufacturing the same

Claim 2

A substrate with a liquid crystal polymeric thin film comprising a substrate, an orientation film formed on said substrate and a thermotropic liquid crystal polymeric thin film formed on said orientation film, in which the orientation film comprises a polyimide having a glass transition point of higher than 300° C. obtained by cyclizing a polyamic acid or its derivative coated on said substrate and applying a rubbing treatment.

Claim 3

A substrate with a liquid crystal polymeric thin film according to claim 1, wherein the polyimide has a structural unit represented by the following formula: ##STR29## wherein R 1 represents ##STR30## R 2 and R 2' represent respectively, ##STR31## and l and n is not more than 50, respectively and l+n=50, and m is 50.

Claim 4

A substrate with a liquid crystal polymeric thin film according to claim 1, wherein the liquid crystal polymeric film comprise a main chain-type liquid crystal polymer having liquid crystalline residual group on the main chain, represented by the following structural formula: --M.sup.1 --X.sup.1 --A.sup.1 --X.sup.2 -- wherein X 1 and X 2 represent respectively --COO--, --CONH--, --OCO-- or --O--, M 1 represents --Ph--COO--Ph--, ##STR32## --Ph--Ph--, --Ph--Ph--COO--Ph-- or --Ph--N═CH--Ph--, A 1 represents --CH 2 ) n , --CH 2 CH 2 O) n , ##STR33## (wherein Ph represents a phenylene group, ##STR34## represents ##STR35## * represents an asymmetric carbon atom, and n represents an integer of 0 to 18), a vinylic and siloxane polymer represented by the following structural formula (5): ##STR36## wherein L represents ##STR37## A 2 represents --CH 2 ) n , --CH 2 CH 2 O) n or ##STR38## M represents --Ph--Ph--R 3 , --O--Ph--Ph--R 3 , --Ph--COO--Ph--R 3 , --O--Ph--COO--Ph--R 3 , --Ph--COO--Ph--R 3 , --O--Ph--OCO--Ph--R 3 , --Ph--Ph--COO--Ph--R 3 , --O--Ph--Ph--COO--Ph--R 3 , --Ph--COO--Ph--Ph--R 3 , --O--Ph--COO--Ph--Ph--R 3 , --Ph--Ph--OCO--Ph--R 3 , --O--Ph--OCO--Ph--Ph--R 3 , --Ph--OCO--Ph--Ph--R 3 or --O--Ph--OCO--Ph--Ph--R 3 etc., (wherein R 3 represents hydrogen atom, (C 1 -C 18 ) alkyl group, (C 1 -C 18 ) alkoxy group, halogen atom, nitro group or cyano group and n represents an integer of 0 to 18)].

Claim 5

A substrate with a liquid crystal polymeric thin film according to claim 3, wherein the liquid crystal polymeric film comprises a polyester.

Claim 6

A substrate with a liquid crystal polymeric thin film according to claim 4, wherein the polyester has the following structural unit: --O--Ar.sup.1 --CO-- --O--Ar.sup.2 CO-- --O--Ar.sup.1 --O-- --CO--Ar.sup.2 CO-- --O--Ar.sup.2 --O-- --CL--Ar.sup.1 CO-- wherein Ar 2 represents ##STR39## (wherein Y represents hydrogen atom, halogen atom, (C 1 -C 4 ) alkyl group, (C 1 -C 4 ) alkoxy group or phenyl group and k is 0, 1 or 2), ##STR40## (wherein n is an integer of 2 to 12), ##STR41## Ar 2 represents ##STR42## (wherein Z represents hydrogen atom, halogen atom, (C 1 -C 4 ) alkyl group, (C 1 -C 4 ) alkoxy group or phenyl group and l represents 0, 1 or 2), ##STR43##

Claim 7

A substrate a with liquid crystal polymeric thin film according to claim 5, wherein the polyester contains o-substituted aromatic unit.

Claim 8

A substrate with a liquid crystal polymeric thin film according to claim 5, wherein the polyester containing the o-substituted aromatic unit comprises the following structural units: ##STR44##

Claim 11

A manufacturing method according to claim 8, wherein the heat-treatment in the step (b) is carried out at a temperature from 100° to 350° C.

Claim 12

A manufacturing method according to claim 8, wherein the heat-treatment in the step (e) is carried out at a temperature from 50° to 300° C.