	US 12,227,666 B2
	2K clearcoat composition, its preparation and use thereof
Yang Zhang, Shanghai (CN); Ji Ming Wang, Shanghai (CN); Lei He, Shanghai (CN); Christian Gerhard Schaefer, Shanghai (CN); Wen Mei Liu, Shanghai (CN); Ranjit Salvi, Shanghai (CN); and Stefan Hirsemann, Shanghai (CN)
Assigned to BASF COATINGS GMBH, Muenster (DE)
Appl. No. 17/623,504
Filed by BASF Coatings GmbH, Münster (DE)
PCT Filed Jun. 22, 2020, PCT No. PCT/EP2020/067286 § 371(c)(1), (2) Date Dec. 28, 2021, PCT Pub. No. WO2021/001187, PCT Pub. Date Jan. 7, 2021.
Claims priority of application No. PCT/CN2019/094430 (WO), filed on Jul. 2, 2019.
Prior Publication US 2022/0372326 A1, Nov. 24, 2022
Int. Cl. C09D 5/00 (2006.01); B05D 1/36 (2006.01); B05D 1/38 (2006.01); B32B 27/30 (2006.01); B32B 27/36 (2006.01); C07F 7/08 (2006.01); C07F 7/18 (2006.01); C09D 7/20 (2018.01); C09D 7/63 (2018.01); C09D 7/65 (2018.01); C09D 133/06 (2006.01); C09D 133/08 (2006.01); C09D 133/10 (2006.01); C09D 133/12 (2006.01); C09D 133/14 (2006.01); C09D 167/00 (2006.01); B32B 15/082 (2006.01); B32B 15/09 (2006.01)

CPC C09D 167/00 (2013.01) [C07F 7/0812 (2013.01); C07F 7/1804 (2013.01); C09D 7/63 (2018.01); C09D 7/65 (2018.01); C09D 133/14 (2013.01)]

23 Claims

1. A 2K clearcoat composition comprising a component I and a component II:

said component I comprising a), b), c) and d):

a) at least one resin having carboxylic acid groups with an acid value of 50 to 400 mg KOH/g,

b) at least one resin having hydroxyl functional groups with a hydroxyl value of 10 to 800 mg KOH/g,

c) at least one catalyst, and

d) at least one solvent; and

said component II comprising e) and f):

e) at least one of e1) an epoxy-functional alkoxysilane of formula I, e2) an epoxy-functional alkoxysilane of formula II, e3) a copolymer formed from the epoxy-functional alkoxysilane of formula I, and e4) a copolymer formed from the epoxy-functional alkoxysilane of formula II; and

f) at least one crosslinker reactive to hydroxyl groups;

wherein copolymers e3) and e4) have at least one backbone selected from the group consisting of poly(meth) acrylate, polyester, polyurethane, polyether and polyolefin, and wherein copolymers e3) and e4) have at least two epoxy groups present as end groups and/or side groups and at least two alkoxysilane groups present as end groups and/or side groups:

wherein R₁is independently a hydrogen or alkyl group having C1-C6, R₂is a hydroxy or alkyl group having C1-C6 or alkoxy group having C1-C6, R₃is at least one selected from the group consisting of alkylene, cycloalkylene, heterocyclic, arylene, alkoxylene, aralkylene, alkenylene, cycloalkylene and polymer moiety, R₄is independently a hydrogen or alkyl group having C1-C6, R₈is independently a hydrogen or alkoxyl group having C1-C6 and at least one is alkoxyl group, n is an integer number 0 or 1 and m is an integer number from 0 to 5.

20. The 2K clearcoat composition according to claim 1, wherein the weight ratio of component I and component II is from 1 to 5.