Bismaleimides and oligomers containing mesogenic groups liquid-crystalline bismaleimides

摘要

PROBLEM TO BE SOLVED: To obtain a mesogenic group-containing bismaleimide having two reactive terminal maleimide groups, containing a cross-linkable mesogenic group, and useful as a cross-linking agent for liquid crystals. ;SOLUTION: A compound of formula I (A is a 3-20C alkylene chain or the like; M is a mesogen comprising at least two rings which are bound to each other at the para-positions through a single bond, a C≡C bond, an ester bond, an amide bond or the like; R is H, a 1-8C alkyl, phenyl or a halogen). For example, a compound of formula II. The compound of formula I wherein X is C(O)0 or C(O)NH is obtained by converting a compound of formula III into the corresponding acid chloride, and then reacting two equivalents of the corresponding acid chloride with a compound of the formula: HO-M-OH or H2N-M- NH2 at a temp. of 0-70°C in a proper solvent, if desired, in the presence of a catalyst and/or an acid receptor.;COPYRIGHT: (C)2000,JPO