Patent ID: 7105211

Claim:
A liquid crystal alignment treating agent for optical alignment treatment, comprising a resin component dissolved in an organic solvent, wherein the resin component comprises: (i) a polyimide precursor having a weight average molecular weight (Mw) from 2,000 to 500,000 and having repeating units represented by the formula (I): (wherein R 1 represents a tetravalent organic group constituting a tetracarboxylic acid, R 2 represents a bivalent organic group constituting a diamine, and n represents a positive integer) or a polyimide obtained by cyclodehydration of the polyimide precursor; and (ii) an acryl polymer having a weight average molecular weight from 1,000 to 1,000,000 and having repeating units represented by the formula (III): (wherein R 3 and R 5 each independently represents a hydrogen atom, a methyl group or a halogen atom, R 4 represents an alkyl group having at least 8 carbon atoms, R 6 represents an organic group having an epoxy group, and k and j each represents a positive integer), and the acryl polymer having the repeating units represented by the formula (III) is from 0.01 to 30 wt% based on the whole resin component.