Patent ID: 8841062

Claim:
A positive working photosensitive composition comprising: a. at least one photoacid generator; b. at least one polymer, comprising one or more (meth)acrylate repeat units and further comprising one or more repeat units with at least one acid cleavable group having formula (5), wherein R 8 -R 12 are, independently, —H, F or —CH 3 , A is a linear or branched C 1 -C 10 alkylene group, B is a C 1 -C 12 alkyl or alicyclic group, D is a linking group that may be a chemical bond, a carboxylate group, wherein the carbonyl carbon is bonded to the polymer backbone, or a —COOCH 2 — group, wherein the carbonyl carbon is bonded to the polymer backbone, Ar is a substituted or unsubstituted aromatic group or heteroaromatic group, E is a linear or branched C 2 -C 10 alkylene group, G is an acid cleavable group, and further where v is 0-10 mole %, w is 0 mole %-20 mole %, x is 14 mole %-80 mole %, y is 0 mole %-40 mole % and z is 20 mole %-50 mole %; c. at least one heterocyclic thiol compound comprising a ring structure chosen from the general formulas: or tautomers thereof, wherein the ring structure is a single ring structure having 4-8 atoms, or a multi ring structure having 5-20 atoms, and wherein the single ring structure or the multi ring structure is chosen from the group consisting of an-aromatic ring, a non aromatic ring, and a heteroaromatic ring, and wherein X is coupled into the ring by a single bond and is chosen from the group consisting of CR 1 R 2 , O, S, Se, Te, and NR 3 , or X is coupled into the ring by a double bond and is chosen from CR 1 or N, and Y is chosen from CR 1 or N, and wherein R 1 , R 2 , and R 3 are independently selected from a group consisting of H, a substituted alkyl group having 1-8 carbon atoms, unsubstituted alkyl group having 1-8 carbon atoms, a substituted alkenyl group having 1-8 carbon atoms, unsubstituted alkenyl group having 1-8 carbon atoms, a substituted alkynyl group having 1-8 carbon atoms, unsubstituted alkynyl group having 1-8 carbon atoms, a substituted aromatic group having 1-20 carbon atoms, a substituted heteroaromatic group having 1-20 carbon atoms, unsubstituted aromatic group having 1-20 carbon atoms and unsubstituted heteroaromatic group having 1-20 carbon atoms and further wherein the ring structures of the heterocyclic thiol compound may be unsubstituted or substituted with substituents chosen from the group consisting of saturated hydrocarbon groups, unsaturated hydrocarbon groups, aromatic rings, aliphatic alcohols, aromatic alcohols, heteroaromatic alcohols, amines, amides, imides carboxylic acids, esters, ethers, and halides.