Patent ID: 8399176

Claim:
A photosensitive resin composition comprising, as an alkali-soluble binder resin, a blend of a first binder resin and a second binder resin; wherein the first binder resin has a weight average molecular weight greater than or equal to 1,000 and less than 20,000, contains no unsaturated double bonds and contains repeating units of Formulae 1, 2 and 3: (wherein each R1 is independently a hydrogen atom or a methyl group, R2 is selected from the group consisting of C 1 -C 10 alkyl groups; C 1 -C 6 alkyl ester groups; phenyl groups substituted with one or more C 1 -C 3 alkyl groups; and phenyl groups substituted with one or more halogen atoms, and a is the number of monomeric units ranging from 10 to 30); (wherein each R1 is independently a hydrogen atom or a methyl group, R3 is selected from the group consisting of C 2 -C 6 alkylene ester groups substituted with one or more phenyl groups (in which each phenyl is optionally substituted with C 1 -C 3 alkyl, halogen or hydroxyl group); C 2 -C 8 alkylene ester groups; phenylene ester groups unsubstituted or substituted with a C 1 -C 3 alkyl group or a halogen atom; phenyl groups optionally substituted with C 1 -C 3 alkyl, halo or hydroxyl group; and C 1 -C 4 alkyl groups substituted with one or more phenyl groups, and b is the number of monomeric units ranging from 10 to 80); (wherein each R1 is independently a hydrogen atom or a methyl group, and R4 is a direct bond; or is selected from the group consisting of C 1 -C 10 alkylene groups; C 1 -C 6 alkylene groups substituted with one or more halogen atoms; and C 1 -C 6 alkylene groups substituted with one or more phenyl groups, and c is the number of monomeric units ranging from 10 to 40); and wherein the second binder resin has a weight average molecular weight greater than or equal to 20,000 and less than 80,000 and contains unsaturated double bonds as reactive groups.