US 11,898,003 B2
Polyester resin, coating agent, adhesive, resin composition, ink, and method for producing polyester resin
Yuka Tachibana, Tokyo (JP); Tadahiro Ozawa, Tokyo (JP); and Asako Kaneko, Tokyo (JP)
Assigned to Mitsubishi Chemical Corporation, Tokyo (JP)
Filed by Mitsubishi Chemical Corporation, Tokyo (JP)
Filed on May 13, 2021, as Appl. No. 17/319,324.
Application 17/319,324 is a continuation of application No. PCT/JP2019/044113, filed on Nov. 11, 2019.
Claims priority of application No. 2018-224336 (JP), filed on Nov. 30, 2018.
Prior Publication US 2021/0261726 A1, Aug. 26, 2021
Int. Cl. C08G 63/137 (2006.01); C08G 63/127 (2006.01); C08G 63/183 (2006.01); C08G 63/83 (2006.01); C08G 63/85 (2006.01); C08G 63/87 (2006.01); C09D 11/104 (2014.01)
CPC C08G 63/137 (2013.01) [C08G 63/127 (2013.01); C08G 63/183 (2013.01); C08G 63/83 (2013.01); C08G 63/85 (2013.01); C08G 63/87 (2013.01); C09D 11/104 (2013.01); C08G 2150/00 (2013.01); C08G 2170/00 (2013.01)] 9 Claims
 
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.