Patent ID: 9470930
Filing Date: 2016-10-18
CPC Classification: B32B,C08G,C09D,C09K,G02F

Claim Text:
1. A liquid crystal display device comprising a substrate, a liquid crystal layer, and an orientation film placed between the substrate and the liquid crystal layer, wherein the orientation film comprises a polyimide formed from a polyimide precursor having at least a first component and a second component, and in the polyimide precursor, when an octanol-water partition coefficient is defined as log P and the difference in log P between the first component and the second component having most distant log Ps are defined as Δ log P, the relational expression 1.20<Δ log P<2.50 is satisfied, wherein the polyimide precursor contains a polyamide acid ester and a polyamide acid, the first component and the second component includes a structure represented by the following chemical formula (1), X represents a hydrogen atom or an alkyl group, Y represents a divalent organic group, and Z represents a tetravalent organic group, and the first component contains the following chemical formula (Z4) as the Z of the chemical formula (1)