Patent ID: 7101652
Filing Date: 2006-09-05
Classification: C08G,C08L,G03F

Abstract:
1. A polybenzoxazole precursor polymer with Structure I wherein Ar 1 is selected from the group consisting of a tetravalent aromatic group, a tetravalent heterocyclic group and mixtures thereof; Ar 2 is selected from the group consisting of a divalent aromatic, a divalent heterocyclic, a divalent alicyclic and a divalent aliphatic group that may contain silicon; Ar 3 is selected from the group consisting of a divalent aromatic group, a divalent aliphatic group, a divalent heterocyclic group and mixtures thereof; Ar 4 is selected from the group consisting of Ar 1 (OH) 2 and Ar 2 , x is from about 10 to about 1000; y is from 0 to about 900; D is selected from the group consisting of one of the following moieties IIa–IIe: wherein, R is selected from the group consisting of H, a C 1 –C 4 alkyl group, a C 1 –C 4 alkoxy group and a cyclohexyl group, k 1 can be any positive value of up to about 0.5, k 2 can be any value from about 1.5 to about 2 with the proviso that (k 1 +k 2 )=2, x is from about 10 to about 1000; y is from about 0 to about 900; G is an organic group having a carbonyl, carbonyloxy or sulfonyl group attached directly to the terminal NH of the polymer.