Patent ID: 7820355

Claim:
A radiation sensitive resin composition which is capable of forming a positive pattern resin film which comprises (A) an alicyclic olefin resin soluble in an alkali, (B) an acid-generating agent, (C) a crosslinking agent and (D) a solvent, wherein the alicyclic resin soluble in an alkali is a ring-opening polymer having an acidic group which is obtained by ring-opening polymerization of a polymerizable monomer comprising an alicyclic olefin monomer having an acidic group in a presence of a catalyst comprising ruthenium, followed by hydrogenating an obtained polymer, wherein the catalyst comprising ruthenium is a catalyst comprising as a main component an organoruthenium compound in which a neutral electron-donating ligand is coordinated, wherein said crosslinking agent is a compound capable of forming a crosslinked structure between molecules of the crosslinking agent by heating, wherein the acidic group is a carboxyl group, and wherein the alicyclic olefin monomer having an acidic group is an alicyclic olefin monomer selected from the group consisting of 8-hydroxycarbonyltetracyclo[4.4.0.1 2,5 .1 7,10 ]dodeca-3-ene, 5-hydroxycarbonylbicyclo[2.2.1]hept-2-ene, 5,6-dihydroxycarbonylbicyclo-[2.2.1]hept-2-ene, 5-methyl-5-hydroxycarbonylbicyclo[2.2.1]hept-2-ene, 5-carboxymethyl-5-hydroxycarbonylbicyclo2.2.1]hept-2-ene, 8,9-di-hydroxycarbonyltetracyclo[4.4.0.1 2,5 .1 7,10 ]dodeca-3-ene, 8-methyl-8-hydroxycarbonyltetracyclo[4.4.0.1 2,5 .1 7,10 ]dodeca-3-ene, 8-methyl-8,9-dihydroxycarbonyltetracyclo[4.4.0.1 2,5 .1 7,10 ]dodeca-3-ene, 8-carboxy-methyl-8-hydroxycarbonyltetracyclo[4.4.0.1 2,5 .1 7,10 ]dodeca-3-ene, 11-hydroxycarbonylhexacyclo[6.6.1.1 3,6 .1 10,13 .0 2,7 .0 9,14 ]heptadeca-4-ene, 11,12-dihydroxycarbonylhexacyclo[6.6.1.1 3,6 .1 10,13 .0 2,7 .0 9,14 ]heptadeca-4-ene, 11-methyl-11-hydroxycarbonylhexacyclo heptadeca-4-ene and 11-carboxymethyl-11-hydroxycarbonylhexacyclo-[6.6.1.1 3,6 .1 10,13 .0 2,7 .0 9,14 ]heptadeca-4-ene.