Substrate with a liquid crystal polymeric thin film and method for manufacturing the same
AssigneesRicoh Company, Ltd., Nippon Oil Co., Ltd.
InventorsYasuyuki Takiguchi, Akihiko Kanemoto, Shigeki Iida, Takehiro Toyooka
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Abstract
Disclosed herein is 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.degree. C. obtained by cyclizing a polyamic acid or its derivative coated on said substrate and applying a rubbing treatment.
Claims10
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.degree. C. obtained by cyclizing a polyamic acid or its derivative coated on said substrate and applying a rubbing treatment.
A method of manufacturing a substrate with a liquid crystal polymeric thin film, which comprises
- (a) coating a solution comprising polyamic acid or its derivative as the essential ingredient on the substrate,
- (b) cyclizing the polyamic acid or its derivatives by heating-treatment, thereby forming a polyimide coating film having a glass transition point of higher than 300.degree. C.,
- (c) applying a rubbing treatment to said polyimide film,
- (d) coating a solution of a thermotropic liquid crystal polymer on the polyimide coating film subjected to rubbing treatment, and
- (e) evaporating the solvent to form a coating film of a liquid crystal polymer, maintaining at a temperature higher thin the glass transition point thereof and subsequently, cooling it to a temperature lower than the glass transition point.
Dependencies are inferred from the claim text.