US 11,884,837 B2
Scratch and mar resistant automotive coatings
Kevin Michael Turley, Southfield, MI (US); Paragkumar Thanki, Mangalore (IN); Gajanan Joshi, Pune (IN); Prasad am Ramanna, Mangalore (IN); Donald H Campbell, Southfield, MI (US); and Bharathi Rajan, Urwa Chilimbi (IN)
Assigned to BASF COATINGS GMBH, Muenster (DE)
Appl. No. 16/769,713
Filed by BASF Coatings GmbH, Münster (DE)
PCT Filed Dec. 7, 2018, PCT No. PCT/EP2018/083989
§ 371(c)(1), (2) Date Jun. 4, 2020,
PCT Pub. No. WO2019/110808, PCT Pub. Date Jun. 13, 2019.
Claims priority of application No. 17205833 (EP), filed on Dec. 7, 2017.
Prior Publication US 2021/0371697 A1, Dec. 2, 2021
Int. Cl. B05D 1/36 (2006.01); B32B 15/092 (2006.01); B32B 27/38 (2006.01); C09D 133/02 (2006.01); C09D 163/00 (2006.01); C09D 167/00 (2006.01); C09D 133/06 (2006.01)
CPC C09D 167/00 (2013.01) [C09D 133/068 (2013.01)] 15 Claims
 
14. A method to coat a substrate, comprising:
i) preparing a 2K coating composition by combining and mixing an epoxy component (A), comprising:
an epoxy resin, wherein the epoxy resin is an acrylic resin having an epoxy group in a side chain;
a solvent;
at least one compound of formula (I):
[(ER)x(R′O)y(HO)z(R″)t(SiO(4-x-y-z-t))]m  (I)
wherein
ER is an alkyl group substituted with an epoxide group or a cycloalkyl group substituted with an epoxide group,
R′ is an alkyl group of 1 to 6 carbon atoms,
R″ is an alkyl group of 1 to 20 carbon atoms which may be linear, branched or cyclic,
x is a number from 0 to 2,
y is a number from 0 to 4,
z is a number from 0 to 3,
t is a number from 0 to 2,
at least one of x and y is greater than 0,
x+y+z+t=4, and
m is =1, and/or oligomer or polymer compounds of the compound of formula (I), wherein partial hydrolysis and condensation provides structures containing epoxy side chains (ER), said structures containing up to 5000 monomeric units m; and
optionally, at least one additive; and
an acid resin component (B), comprising:
a carboxylic acid resin including carboxylic acid groups;
a solvent;
optionally, at least one catalyst; and
optionally, at least one additive;
ii) applying the 2K coating composition to the substrate; and
iii) drying and curing the applied composition on the substrate.
 
15. The method according to claim 14, wherein
the 2K coating composition is applied onto a wet basecoat composition and the basecoat composition and 2K coating composition are simultaneously dried and cured.