Patent ID: 7056641

Claim:
A positive photosensitive resin composition comprising: (a) at least one polybenzoxazole precursor polymer having the 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, or a divalent aliphatic group that may contain silicon, and mixtures thereof; Ar 3 is selected from the group consisting of a divalent aromatic group, a divalent aliphatic group, a divalent heterocyclic group, and mixtures thereof; x is from about 10 to about 1000; y is 0 to about 900; and wherein in the precursor polymers (I) and (II) x+y is less than about 1000, and wherein the ratio of the amount of precursor polymer (I) to precursor polymer (II) is from about 35:65 to about 65:35; (b) at least one polybenzoxazole precursor polymer having the structure (II) wherein Ar 1 , Ar 2 , Ar 3 , x and y are as previously defined; D is selected from the group consisting of one of the following moieties: wherein R is selected from the group consisting of H, a halogen, a C 1 –C 4 alkyl group, a C 1 C 4 alkoxy group, and 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 2 with the proviso that (k 1 +k 2 )=2, (c) at least one photosensitive agent; and (d) at least one solvent.