Optical film and its production method, polarizer and liquid crystal display device

摘要

An optical film having a core layer containing a (meth)acrylic resin having a lactone ring structure, and an outer layer containing a cellulose acetate with a thickness of from more than 3 μm to 20 μm on at least one side of the core layer is excellent in nonbrittleness and adhesiveness to a polarizing element.

主权项

1. An optical film having three layers consisting of:
a core layer containing a (meth)acrylic resin having a lactone ring structure and having a thickness of from 10 to 100 μm, wherein the lactone ring structure is represented by the following formula (1): wherein R1, R2 and R3 each independently represent a hydrogen atom, or an organic residue having from 1 to 20 carbon atoms; and two outer layers wherein each one outer layer is formed on both sides of the core layer, the outer layer containing a cellulose acetate and having a thickness of from more than 3 μm to 20 μm, wherein the cellulose acetate resin satisfies the following condition:
2.5≦TA2≦3.0 wherein TA2 means the degree of substitution with acyl group having 2 carbon atoms, and wherein the proportion of the total thickness of the outer layers to the total thickness of the film is from 2 to 20%.