Patent ID: 6991834
Filing Date: 2006-01-31
Classification: C08G,C09K,G02F,Y10T

Abstract:
1. Polymers selected from the group consisting of polyimides, polyamic acids and esters thereof, characterized in that they comprise identical or different repeat units selected from one or more of the formula wherein B is hydrogen or a monovalent organic group derived from an alcohol after formal removal of the hydroxyl group, M is a tetravalent organic radical of a tetracarboxylic acid anhydride after formal removal of the two —CO—O—CO— groups, the four valencies of which are distributed between four different carbon atoms of the radical; A is a trivalent unsubstituted or optionally fluoro-, chloro-, cyano-, alkyl-, alkoxy-, fluoroalkyl- or fluoroalkoxy-substituted aromatic or alicyclic radical; Y is selected from the group of C 3 –C 22 linear and branched hydrocarbon and partially fluorinated hydrocarbon chains, optionally substituted by one to two heteroatoms selected from the group consisting of N, S, O and having one to four carbon—carbon double bonds.