Patent ID: 8956732
Filing Date: 2015-02-17
Classification: B32B,C08G,C09J,H05K,Y10S,Y10T

Abstract:
1. A polyamide-imide resin obtained by a process comprising the step of reacting a diimide dicarboxylic acid with an aromatic diisocyanate, and further reacting therewith a further compound selected from the group consisting of phthalic acid, trimellitic acid, maleic acid, biphthalic acid, naphthalene dicarboxylic acid, aminonaphthalene acid, aminobenzoic acid, diaminonaphthalene, diaminobenzoic acid, phenyldiamine and derivatives thereof, wherein said diimide dicarboxylic acid contains 40 mol % or more of a compound represented by the following general formula (1), 20 mol % or more of a compound represented by the following general formula (2), and a compound produced by the reaction of an alicyclic diamine and a trimellitic anhydride, wherein n 1 is an integer of 1 to 100 in the formula (1), and R 1 and R 2 each independently represent a divalent organic group, R 3 and R 4 each independently represent a C 1-20 alkyl group or a C 6-18 aryl group, a plurality of R 3 and R 4 in the same molecule may be the same or different, and n 2 is an integer of 1 to 50 in the formula (2), wherein the polyamide-imide resin has at least one terminal functional group selected from the group consisting of a carboxyl group and an amino group, and wherein the polyamide-imide resin has a carboxylic acid equivalent of 3000 to 15000 g/eq or an amine equivalent of 3000 to 15000 g/eq.