US 10,889,733 B2
Coating composition for forming scratch-resistant layer having high strength for automobile exterior and method for coating automobile exterior using the same
Jae Beom Ahn, Anyang-si (KR); Young Hoon Choi, Cheonan-si (KR); Dae Geun Oh, Cheonan-si (KR); Sung Do Kim, Cheonan-si (KR); and Si Hyun Jeong, Asan-si (KR)
Assigned to NOROO BEE Chemical Co., Ltd., Cheonan-Si (KR)
Filed by NOROO BEE Chemical Co., Ltd., Cheonan-Si (KR)
Filed on Nov. 29, 2018, as Appl. No. 16/204,025.
Claims priority of application No. 10-2017-0170743 (KR), filed on Dec. 12, 2017.
Prior Publication US 2019/0177569 A1, Jun. 13, 2019
Int. Cl. C09D 133/14 (2006.01); C08G 18/62 (2006.01); C09D 133/10 (2006.01); C09D 7/63 (2018.01); C09D 5/00 (2006.01); C09D 133/06 (2006.01); C08G 18/40 (2006.01); C09D 175/06 (2006.01); C08L 33/08 (2006.01); C08L 67/04 (2006.01); C08K 5/29 (2006.01); C08G 63/91 (2006.01)
CPC C09D 133/10 (2013.01) [C08G 18/4063 (2013.01); C08G 18/6229 (2013.01); C08G 18/6233 (2013.01); C09D 5/00 (2013.01); C09D 7/63 (2018.01); C09D 133/066 (2013.01); C09D 175/06 (2013.01); C08G 63/912 (2013.01); C08K 5/29 (2013.01); C08L 33/08 (2013.01); C08L 67/04 (2013.01)] 12 Claims
 
1. A coating composition for forming a scratch-resistant layer having a high strength for automobile exterior, comprising:
5 wt % to 20 wt % of a caprolactone-modified hyperbranched polyester polyol, the caprolactone-modified hyperbranched polyester polyol obtained from polyhydric alcohol including caprolactone triol;
30 wt % to 50 wt % of a first acrylic resin, the first acrylic resin having a hydroxyl group;
15 wt % to 25 wt % of a second acrylic resin, the second acrylic resin having a hydroxyl group and having a glass transition temperature higher than that of the first acrylic resin; and
20 wt % to 40 wt % of a solvent,
wherein the first acrylic resin has a solid content of 60% to 70%, a weight average molecular weight of 5,000 to 12,000, and a glass transition temperature of 10° C. to 20° C.