POLYBENZOXAZOLE RESIN, AND PRECURSOR RESIN THEREOF

摘要

Provided are a polybenzoxazole precursor resin in which the amount of ionic impurities contained therein is reduced and which is useful when used for electric and electronic components, and a polybenzoxazole resin which is obtained by the cyclic dehydration of the aforementioned precursor resin. The polybenzoxazole precursor resin is obtained by the polymerization reaction between a dicarboxylic acid triazine-activated ester represented by formula (A) and a bis aminophenol compound, has a weight average molecular weight in the range of 10,000-1,000,000, and contains no more than 10ppm of ionic impurities. (In formula (A), R1 represents a divalent aromatic residue containing at least one element selected from O, N, S, F and Si in the structure thereof, or a C1-12 divalent organic group. R2 represents a C1-4 alkyl group, or a C6-8 aromatic residue.)