Patent ID: 8703901

Claim:
A method for preparing the reactive transparent polyimide precursor having the structure in the following Chemical Formula 1: wherein X is a tetra-valent organic group derived from alicyclic tetracarboxylic acid dianhydrides having 3 to 30 carbon atoms; Y is a di-valent organic group derived from one or more diamines selected from the group consisting of diamines having the general formulae represented by the following Chemical Formulae 7 to 9: where Z is one of an ester, amide, imide, ether, and a carbonyl group; R 3 , R 4 and R 5 are independent of each other a hydrogen atom or alkyl or aryl groups having 1 to 20 carbon atoms; and n is an integer between 1 to 20; and R 1 and R 2 are independently each other hydrogen atom, or organic group having 1 to 20 carbon atoms including one or more ethylenically unsaturated bond(s), provided that they are not hydrogen atom at the same time, the method comprising the steps of: preparing transparent linear polyamic acid (A) from (a-1) one or more of tetracarboxlic acid dianhydrides selected from alicyclic tetracarboxylic acid dianhydrides having 3 to 30 carbon atoms, and (a-2) one or more diamines selected from the group consisting of diamines having the general formulae represented by the above Chemical Formulae 7 to 9; and esterifying the transparent linear polyamic acid (A) thus obtained with an ethylenically unsaturated compound (B) containing an epoxy group in the same molecule.