| 摘要 |
The present invention provides a urethane resin composition containing a urethane resin (A) having polymerizable unsaturated groups and an aqueous medium (B). The urethane resin (A) is obtained by reacting a polyol (a1) with a polyisocyanate (a2). The polyol (a1) contains an alkylenediol (a1-1) having two or more polymerizable unsaturated groups or an oxyalkylenediol (a1-2) having two or more polymerizable unsaturated groups. The alkylenediol (a1-1) is represented by general formula (1):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒHO-R 1 -OH€ƒ€ƒ€ƒ€ƒ€ƒ(1)
(where R 1 is a linear alkylene group of one to nine carbon atoms having two or more atomic groups containing a polymerizable unsaturated group in side chains thereof). The oxyalkylenediol (a1-2) is represented by general formula (2) :
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒHO-R 1 O-R 2 -OR 3 -OH€ƒ€ƒ€ƒ€ƒ€ƒ(2)
(where R 1 and R 3 are ethylene groups having a total of two or more atomic groups containing a polymerizable unsaturated group in side chains thereof, and R 2 is an alkylene group of one to five carbon atoms). This urethane resin composition can form a coating with good elongation and flexibility and high hardness. |
