| 摘要 |
PROBLEM TO BE SOLVED: To provide a coating agent which is suitably used for aqueous compositions and gives a coating being excellent in quick-drying properties and being flexible and excellent in water resistance.SOLUTION: A copolymer is provided which is obtained by polymerizing a hydrophilic acrylic monomer having a specific structure and a monomer selected from an acrylic ester monomer having a polymerizable carboxyl group and two acyl groups having a specific branched structure and an acrylic ester monomer having a polymerizable carboxyl group and two acyl groups having a specific branched structure. |
