Liquid crystal film and laminated film for optical devices

Abstract

Provide a kind of liquid crystal thin film, it is characterized in that, even in the severe environment test such as high temperature test and dry-wet reciprocating test of high temperature and high humidity test, as the thin liquid crystal thin film that does not produce abnormal appearance such as crack in the liquid crystal alignment layer, is based on A liquid crystal film formed by laminating a layer of a cured acrylic resin layer / an orientation-immobilized liquid crystal substance layer / a cured acrylic resin layer in this order, and at least one cured acrylic resin layer has a glass transition temperature (Tg) of 50 Above 200°C and below 200°C.

Description

technical field [0001] The present invention relates to a laminated film for optical elements formed by laminating liquid crystal films and polarizing films used in various optical elements. Background technique [0002] In recent years, optical films used in liquid crystal display devices have been required to have higher durability in addition to excellent optical performance. In particular, liquid crystal display devices for portable devices such as mobile phones and for vehicles are required to pass strict environmental tests assuming various usage conditions. [0003] A film (film) comprising an alignment layer of a liquid crystal compound, especially a film comprising a liquid crystal material immobilized to a nematic structure, a twisted nematic structure or a nematic hybrid structure, used as a color for a liquid crystal display element Compensation, viewing angle compensation elements, and excellent performance as optically active optical elements, etc., contribute...

AI Technical Summary

Problems solved by technology

However, an optical film made of an alignment layer of a liquid crystal compound has a problem that, for example, it cannot follow the shrinkage of the polarizing plate in a long-term dry-wet reciprocating test (cycle test) in a high-temperature environment test and a high-temperature and high-humidity environment test. , appearance abnormalities such as cracks (cracks) or deformation are likely to occur on the liquid crystal alignment layer

In particular, when the alignment-fixed liquid crystal material layer is used for liquid crystal alignment at a temperature above the liquid crystal transition point and a polymer liquid crystal in a glass state at a temperature below the liquid crystal transition point, because the balance between the liquid crystal orientation and the liquid crystal orientation , so there are limitations in improving the mechanical strength of the liquid crystal material layer by increasing the molecular weight, etc.