Patent · US Expired

Bismaleimides comprising mesogenic groups

US6169186A · kind A · utility

3Cited by

3References

13Claims

0Family size

Assignee

Dainippon Ink and Chemicals, Inc. · JP

Inventors

Masaru Imai · Shibukawa, JP
Rainer B. Frings · Berlin, DE
Gerwald Grahe · Berlin, DE
Joji Kawamura · Adachi, JP
Naoki Obi · Tokyo, JP

Key dates

Filing date	Dec 27, 1999
Grant date	Jan 2, 2001
Priority date	—
Expiry date	Dec 27, 2019

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09K19/38
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

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, ##STR1## wherein A, X, M and R are as defined in the specification. The invention, moreover, relates to oligomeric liquid crystalline bismaleimides of general formula (II) ##STR2## wherein A, X, M and R are as defined above, n represents and 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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.