Patent ID: 6740371
Filing Date: 2004-05-25
Classification: C07C,C08G,C09K,G02F,Y10T

Abstract:
A liquid crystal alignment film containing a polyimide obtained by reacting a diamine containing at least 1 mol % of a diaminobenzene derivative represented by the general formula (1): &Parenopenst;wherein each of X and P which are independent of each other, is a single bond or a bivalent organic group selected from â€”Oâ€”, â€”COOâ€”, â€”OCOâ€”, â€”CONHâ€” and â€”NHCOâ€”, Q is a C1-22 straight chain alkyl group or straight chain fluoroalkyl group with the proviso that when X is oxygen, P cannot be a single bond, a is an integer of from 1 to 4 and represents the number of substituents, R is a substituent selected from fluorine, a methyl group and a trifluoromethyl group, and b is an integer of from 0 to 4 and represents the number of substituents&Parenclosest;, with at least one compound selected from a tetracarboxylic dianhydride and its derivatives, to obtain a polyimide precursor having a reduced viscosity of from 0.05 to 5.0 dl/g &Parenopenst;in N-methylpyrrolidone at a temperature of 30Â° C., concentration: 0.5 g/dl&Parenclosest; and ring-closing it, and having a repeating unit represented by the general formula (2): &Parenopenst;wherein A is a tetravalent organic group constituting a tetracarboxylic acid, and B is a bivalent organic group constituting a diamine&Parenclosest;.