Nissan Chemical Industries Limited

Kio Mizuno

Go Ono

Hideyuki Endo

Mariko Kurosaki

To provide a liquid crystal aligning agent which gives a coating film with good uniformity regardless of drying temperature after coating, and a liquid crystal alignment film having good coating film uniformity. A liquid crystal aligning agent comprising at least one polymer selected from a polyamic acid and a soluble polyimide, diethylene glycol diethyl ether, and dipropylene glycol monomethyl ether, and a liquid crystal alignment film obtained by printing this liquid crystal aligning agent by a flexographic printing method.

Aligning agent for liquid crystal and liquid-crystal alignment film obtained with the same

A liquid crystal alignment treating agent containing a polyamic acid which is represented by the following formula (I) and exhibits a reduced viscosity of from 0.05 to 5.0 dl/g (in N-methyl-2-pyrrolidone at 30&#xb0; C. at a concentration of 0.5 g/dl) or a polyimide obtained by cyclodehydration thereof: wherein Rrepresents a tetravalent organic group, at least 20 mol % of which has a fused alicyclic structure composed of two to five rings, and all of the carbonyl groups are directly bonded to the alicyclic structure and that any two carbonyl groups are not bonded to adjacent carbon atoms of the alicyclic structure; Ris a bivalent organic group, from 20 to 100 mol % of which has in the side-chain structure at least one structural unit selected from the group consisting of Clong-chain alkyl, Cfluoroalkyl, alicyclic structures and aromatic ring structures; and L is a positive integer.

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Chiba, Japan

Kio Mizuno