Patent ID: 7195849

Claim:
A positive photosensitive resin composition comprising: (a) at least one polybenzoxazole precursor polymer having structure I or II; wherein Ar 1 is selected from the group consisting of a tetravalent aromatic group, a tetravalent heterocyclic group, or mixtures thereof; Ar 2 is selected from the group consisting of a divalent aromatic, a divalent heterocyclic, a divalent alicyclic, or a divalent aliphatic group that may contain silicon or mixtures thereof; Ar 3 is selected from the group consisting of a divalent aromatic group or a divalent aliphatic group, a divalent heterocyclic group, or mixtures thereof; D is selected from the group consisting of one of the following moieties: wherein R is selected from the group consisting of H, halogen, a C 1 –C 4 alkyl group, a C 1 –C 4 alkoxy group, or a C 5 –C 7 cycloalkyl 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; (b) at least one photosensitive compound selected from the group consisting of compounds described by structures III–V, wherein R 1 , R 2 , R 4 , R 5 , R 6 and R 7 each independently are selected from the group consisting of a linear or branched C 1 –C 4 alkyl group, a phenyl or halide substituted C 1 –C 4 linear or branched alkyl group, a perfluorinated C 1 –C 4 linear or branched alkyl group, a C 5 –C 7 cycloalkyl group, a C 1 –C 4 alkyl or halide substituted C 5 –C 7 cycloalkyl group or alternatively R 1 and R 2 or any two of R 4 , R 5 , and R 6 may together form a 5–7 membered ring; each R 3 is independently selected from the group consisting of H, a linear or branched C 1 –C 4 alkyl group, a halide substituted C 1 –C 4 linear or branched alkyl group, a perfluorinated linear or branched C 1 –C 4 alkyl group, a C 5 –C 7 cycloalkyl group, a C 1 –C 4 alkyl or halide substituted C 5 –C 7 cycloalkyl group, an unsubstituted phenyl group or a phenyl or alkyl or halide substituted phenyl group; Q is selected from the group consisting of H or D with the proviso that at least one Q=D; D is as defined hereinbefore; a is an integer from 1 to 5; b and c are integers from 0 to 5 with the provisos (1) that for Structure III, if a=b=1 and both OQ are substituted para to the R 1 R 2 C substituent, then both R 1 and R 2 are not simultaneously methyl and (2) 1<=a+b<6; and the proviso that for Structure V, if a=b=c=1 and all OQ are para to the triphenyl methane carbon substituent, then at least one R 3 is not H; (c) at least one solvent; and (d) optionally an adhesion promoter.