Patent ID: 7374861

Claim:
A negative photoresist composition comprising the following components dissolved in a solvent: a) a polyimide having the following chemical structure (I); b) an unsaturated vinyl monomer that contains a tertiary amino group; and c) a photoinitiator, wherein an amount of the photoinitiator c) is 0.1-30% based on the weigh of the solid content of the polyimide (I), an amount of the monomer b) is 70-130% of moles of carboxyl group contained in the polyimide (I), wherein Ar 1 is a tetra-valent radical; Ar 2 is a bivalent radical; Ar 3 is a bivalent radical that contains a carboxyl group; Ar 4 is a bivalent radical that contains —CH 2 —C(OH)H—CH 2 —O—C(O)—C(R)═CH; in which R is H or a methyl group; m+n+o=1,0.1≦n+o≦0.6, and n:o=9:1˜4:6.