Patent ID: 8232366

Claim:
A reactive transparent polyimide precursor having the structure in the following Chemical Formula 1: where X is a tetra-valent organic group derived from alycyclic tetracarboxylic acid dianhydrides having 3 to 30 carbon atoms; Y is a di-valent organic group derived from aliphatic, alicyclic, or non-conjugated aromatic diamines which have 3-30 carbon atoms and side chains, wherein the side chains have one or more ethylenically unsaturated bonds capable of being crosslinked by a radical; and R 1 and R 2 are, independent of each other, a hydrogen atom or an organic group having 1 to 20 carbon atoms including one or more ethylenically unsaturated bond(s), provided that R 1 and R 2 are not hydrogen atoms at the same time, wherein the acid value of said reactive transparent polyimide precursor is within a range of 30 to 200 mg KOH/g, and said reactive transparent polyimide precursor is a negative type photosensitive precursor, wherein R 1 and R 2 including one or more ethylenically unsaturated bond(s) are derived from one or more compounds selected from the group consisting of allyl glycidyl ether, glycidyl acrylate, glycidyl methacrylate, 3,4-epoxycyclohexylmethyl acrylate, 3,4-epoxycyclohexylmethyl methacrylate, glycidyl 5-norbornene-2-carboxylate (a mixture of endo and exo forms), glycidyl 5-norbornene-2-methyl-2-carboxylate (a mixture of endo and exo forms), 1,2-epoxy-5-hexene, and 1,2-epoxy-9-decene.