Patent ID: 7648815

Claim:
A negative-type photosensitive polyimide composition comprising a photo radical initiator which generates free radical upon being irradiated with light or electron beam and a solvent-soluble polyimide which shows negative-type photosensitivity in the presence of said photo radical initiator, and wherein said solvent-soluble polyimide consists essentially of at least one aromatic diamine component selected from the group consisting of 4,4′-diaminodiphenyl ether, 3,4′-diaminodiphenyl ether, bis(4-phenoxy) 1,4-benzene, bis(3-phenoxy)1,4-benzene, bis(3-phenoxy) 1,3-benzene, 2,2-bis(4- aminophenyl)propane, 1,1,1,3,3,3-hexafluoro-2-bis(4-aminophenyl)propane, 4,4′-diaminodiphenylmethane, bis(4-aminophenoxy)4,4′-diphenyl, 2,2-bis {(4-aminophenoxy)phenyl}pronane, 2,2-bis {(4-aminophenoxy)phenyl }hexafluoropropane, 1,3-diaminobenzene, 1,4-diaminobenzene, 2,4-diaminotoluene, 3,3′-dimethyl-4,4′-diaminobiphenyl, 2,2′-bis(trifluoromethyl)benzidine, bis(4-aminophenoxy)-1,3-(2,2-dimethyl)propane and diaminosiloxane; and at least one aromatic acid component selected from the group consisting of 3,4,3′,4′-benzophenonetetracarboxylic dianhydride, 3,4,3′,4′-biphenyltetracarboxylic dianhydride, pyromellitic dianhydride, 2,3,3′,4′-biphenyl ether tetracarboxylic dianhydride, 1,2,5,6-naphthalenetetracarboxylic dianhydride, 2,3,5,6-pyridinetetracarboxylic dianhydride, 3,4,3′,4′-biphenylsulfonetetracarboxylic dianhydride, bicyclo(2,2,2)-oct-7-ene-2,3,5,6-tetracarboxylic dianhydride, 4,4′- {(2 and 2,2-trifluoro- 1-(trifluoromethyl)ethylidenel}bis( 1,2-benzenedicarboxylic dianhydride).