US 12,441,905 B2
Coatings with improved adhesion
Kaliappa Ragunathan, Charlotte, NC (US)
Assigned to BASF SE, Ludwigshafen Am Rhein (DE)
Appl. No. 17/761,603
Filed by BASF SE, Ludwigshafen am Rhein (DE)
PCT Filed Sep. 16, 2020, PCT No. PCT/US2020/051122
§ 371(c)(1), (2) Date Mar. 18, 2022,
PCT Pub. No. WO2021/055512, PCT Pub. Date Mar. 25, 2021.
Claims priority of provisional application 62/903,342, filed on Sep. 20, 2019.
Prior Publication US 2022/0363938 A1, Nov. 17, 2022
Int. Cl. C09D 133/00 (2006.01); C09D 125/08 (2006.01); C09D 133/08 (2006.01); C09D 133/10 (2006.01)
CPC C09D 133/08 (2013.01) [C09D 125/08 (2013.01); C09D 133/10 (2013.01)] 18 Claims
 
1. A coating composition, comprising a plurality of polymer particles comprising a first copolymer derived from a first polymerization of a first monomer mixture in an amount from 95 to 80% by weight, based on the total weight of the first copolymer and the second copolymer and a second copolymer derived from a second polymerization of a second monomer mixture in an amount from 5-20% by weight, based on the total weight of the first copolymer and the second copolymer, the first monomer mixture comprising:
25 to 65% by weight tert-butyl acrylate, based on the total monomer weight in the first monomer mixture;
5 to 55% by weight n-butyl (meth)acrylate, based on the total monomer weight in the first monomer mixture; and
at least one ethylenically unsaturated acid in an amount from 0.1-5% by weight, based on the total monomer weight in the first monomer mixture;
wherein the first monomer mixture comprises a free radical chain transfer agent selected from tert-butyl mercaptan, mercaptoethanol, mercaptopropyltrimethoxysilane, tert-dodecyl mercaptan, 1,8-dimercapto-3,6-dioxaoctane, n-dodecyl mercaptan, n-octyl mercaptan, terpinolene, 2-ethylhexyl thioglycolate, iso-octyl mercapto propionate, α-methyl styrene dimer, cobalt complexes, and combinations thereof;
wherein the first monomer mixture comprises a free radical chain transfer agent in an amount of at least 0.25% by weight based on the total monomer weight in the first monomer mixture; and
wherein the second monomer mixture comprises tert-butyl acrylate, styrene, n-butyl (meth)acrylate, methyl methacrylate, or a combination thereof,
wherein the second monomer mixture comprises at least one ethylenically unsaturated acid on an amount from 0.2-5% by weight, based on the total monomer weight in the second monomer mixture.