SILICON-CONTAINING LIQUID CRYSTAL ALIGNING AGENT, LIQUID CRYSTAL ALIGNMENT FILM AND THEIR PRODUCTION METHODS

摘要

Disclosed is a silicon-containing liquid crystal aligning agent which enables to produce a liquid crystal alignment film having good liquid crystal alignment and high voltage holding ratio during device operation at a low frequency under high temperature conditions. Also disclosed is a method for producing such a silicon-containing liquid crystal aligning agent. Specifically disclosed is a liquid crystal aligning agent characterized by containing the following polysiloxane (A) and polysiloxane (B). Polysiloxane (A): a polysiloxane obtained by polycondensing an alkoxysilane containing an alkoxysilane represented by the following formula (1). R¹Si(OR²)₃ (1) (In the formula, R¹ represents an organic group having 8-30 carbon atoms, and R² represents a hydrocarbon group having 1-5 carbon atoms.) Polysiloxane (B): a polysiloxane obtained by polycondensing an alkoxysilane containing a tetraalkoxysilane represented by the following formula (2). Si(OR³)₄ (2) (In the formula, R³ represents a hydrocarbon group having 1-5 carbon atoms.)