| 摘要 |
<p>An alkyldiamine having excellent polymerization reactivity, a polyimide comprising it as a constituting element, and a liquid crystal alignment film excellent in uniformity of liquid crystal alignment, are presented. Namely, the present invention relates to a diaminobenzene derivative represented by the following general formula (1) and to a polyimide obtained by reacting a diamine containing at least 1 mol% of the diaminobenzene derivative represented by the general formula (1), 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 d l /g (in N-methylpyrrolidone at a temperature of 30 DEG C, concentration: 0.5 g/d l ) and ring-closing it, and having a repeating unit represented by the general formula (2). Further, the present invention relates to a liquid crystal alignment film containing at least 1 mol% of the above repeating unit. <CHEM> <CHEM> (in the formula (1), each of X and P which are independent of each other, is a single bond or a bivalent organic group selected from -O-, -COO-, -OCO-, -CONH- and -NHCO-, Q is a C1-22 straight chain alkyl group or straight chain fluoroalkyl group, 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, and in the formula (2), A is a tetravalent organic group constituting a tetracarboxylic acid, and B is a bivalent organic group constituting a diamine).</p> |
