POLYIMIDE PRECURSOR AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To obtain a polyimide precursor imparted low-temperature curability and high adhesivity to substrate by a easy method by making the precursor include an aliphatic or alicyclic ether linkage in at least a part of the main chain. SOLUTION: This precursor is obtained by including an aliphatic or alicyclic ether linkage in at least a part of the main chain. This precursor pref. includes a polyamic acid structural unit of the formula (R1 is a polycarboxylic acid residue; R2 is a polyvalent amine residue having aliphatic or alicyclic ether linkages; (n) is 0-4), being pref. a polyamic acid which is prepared by reaction between (A) tetracarboxylic acid dianhydride(s) with pref. at least part thereof being 4,4'-oxy-diphthalic acid dianhydride or the like and (B) a diamine component with at least part thereof being an ether linkage-contg. aliphatic or alicyclic diamine in (C) a polar solvent (e.g. N-methyl-2-pyrrolidone).