Patent ID: 8496849

Claim:
A liquid crystal aligning agent comprising a liquid crystal aligning polyorganosiloxane obtained by reacting at least one reactive polyorganosiloxane selected from the group consisting of a polyorganosiloxane having a recurring unit represented by the formula (S-1), a hydrolysate thereof and a condensate of the hydrolysate, wherein X 1 is a group having an epoxy group, and Y 1 is a hydroxyl group, alkyl group having 1 to 20 carbon atoms, alkoxyl group having 1 to 10 carbon atoms or aryl group having 6 to 20 carbon atoms, with a reactive compound including at least one compound represented by the formula (1): wherein A 1 is an alkyl group having 1 to 20 carbon atoms, cycloalkyl group having 5 to 10 carbon atoms which may optionally be substituted by an alkyl group or alkoxyl group having 1 to 20 carbon atoms, or hydrocarbon group having 17 to 51 carbon atoms and a steroid skeleton, L 0 is a single bond, *—O—, *—COO— or *—OCO—, wherein the bond marked with * is bonded to A 1 , and L 1 is a single bond, phenylene group, biphenylene group, cyclohexylene group, bicyclohexylene group or group represented by the formula (L 1 -1) or (L 1 -2): wherein the bond marked with * is bonded to Z, and Z is a carboxyl group, with the proviso that when L 1 is a single bond, L 0 is a single bond, and X 1 in the formula (S-1) and Z in the formula (1) are monovalent organic groups which may optionally be reacted with each other to form a bond group, wherein the reactive polyorganosiloxane has a X 1 group content of 0.0001 to 0.02 mole/g and a weight average molecular weight in terms of polystyrene measured by gel permeation chromatography of 200 to 100,000.