Patent ID: 11898003
Assignee: MITSUBISHI CHEMICAL CORPORATION
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  G | IPC C

Claim 0:
1. A polyester resin comprising:
a constitutional unit A derived from a carboxylic acid having a cyclic structure and containing 5 or more carboxyl groups;
a constitutional unit derived from a dicarboxylic acid; and
a constitutional unit derived from a polyhydric alcohol,
wherein
the constitutional unit A has a content of 0.01 parts by mole or more and 5 parts by mole or less with respect to 100 parts by mole of the constitutional unit derived from a dicarboxylic acid,
the carboxylic acid having a cyclic structure and containing 5 or more carboxyl groups is at least one selected from the group consisting of benzenepentacarboxylic acid, cyclohexanehexacarboxylic acid and mellitic acid,
the acid value of the polyester resin is 0.1 mgKOH/a or more and 0.8 mgKOH/a or less, and
the hydroxyl value of the polyester resin is 6 mgKOH/g or more and 27 mgKOH/g or less.