Bismaleimides comprising mesogenic groups and oligomeric liquid crystalline bismaleimides

摘要

The invention relates to bismaleimides comprising mesogenic groups which consist, corresponding to (I) , of two reactive terminal maleimide groups which are linked via linear or singly alkyl-substituted alkylene chains A, which are linked to an aromatic mesogen M via ester, amide or ether groups, <CHEM> wherein A independently represents an alkylene chain comprising 3 to 20 CH2 groups, wherein one C atom of each alkylene chain A can be chiral due to alkyl substitution, X independently represents -C(O)O-, -C(O)NH- or -O-, and M represents a mesogen consisting of at least two rings including an aromatic or a heterocyclic ring, which are linked para to each other by single bond, -CH2-CH2-, -CH=CH-, -C IDENTICAL C-, ester (-COO-), amide (CONH-), methylstilbene (-C(CH3=CH-), azomethine (-CH=N-), azine (-CH=N-N=CH-), azo (-N=N-) or azoxy (-N(O)=N-) groups, and which can be mono- or di-substituted by alkyl groups, wherein the terminal aromatic rings are each substituted in the para position to these linking groups by an O or NH group of X, and R independently represents an H atom, an alkyl group comprising 1 to 8 C atoms, a phenyl ring or a halogen atom. The invention, moreover, relates to oligomeric liquid crystalline bismaleimides of general formula (II) <CHEM> wherein A, X, M and R are as defined above, n represents an integer from 1 to 100 and B represents piperazinyl or a divalent radical which is derived from a primary or secondary para-substituted cyclic diamine, wherein B is bonded via the amino groups of the diamine. The invention also relates to methods of producing said bismaleimides.