POLYESTER RESIN, PHOTOCURABLE-HEAT CURABLE RESIN COMPOSITION, PHOTOCURABLE-HEAT CURABLE LAYER, INK, ADHESIVE AND PRINTED CIRCUIT BOARD

摘要

PROBLEM TO BE SOLVED: To provide a polyester resin having a hard segment, a soft segment and a carboxyl group based on an acid dianhydride in a main chain and further containing phosphorus atoms in the main chain or in a side chain.

SOLUTION: The polyester resin includes a hard segment based on an ester link-containing diol oligomer having at least two ester links and hydroxyl groups at both ends and having a glass transition temperature of >0°C and a number average molecular weight of 800-4,000, and a soft segment based on an ester link-containing diol oligomer having at least two ester links and hydroxyl groups at both ends and having a glass transition temperature of ≤0°C and a number average molecular weight of 800-4,000, and the polyester resin contains 0.5-7 wt.% of phosphorus atoms.

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