US 12,240,995 B2
Aqueous coating composition, substrate coated with such composition, process for controlling aquatic biofouling using such coating composition
James Ferguson, West Boldon (GB); and Alistair Andrew Finnie, Whitley Bay (GB)
Assigned to Akzo Nobel Coatings International B.V., Amsterdam (NL)
Appl. No. 17/600,664
Filed by Akzo Nobel Coatings International B.V., Amsterdam (NL)
PCT Filed Mar. 30, 2020, PCT No. PCT/EP2020/058958
§ 371(c)(1), (2) Date Oct. 1, 2021,
PCT Pub. No. WO2020/201213, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 19166827 (EP), filed on Apr. 2, 2019.
Prior Publication US 2022/0177712 A1, Jun. 9, 2022
Int. Cl. C09D 5/16 (2006.01); B32B 27/30 (2006.01); C08F 220/28 (2006.01); C09D 5/00 (2006.01); C09D 7/20 (2018.01); C09D 133/14 (2006.01); C09D 163/00 (2006.01)
CPC C09D 5/1668 (2013.01) [C08F 220/286 (2020.02); C09D 5/002 (2013.01); C09D 7/20 (2018.01); C09D 133/14 (2013.01); C09D 163/00 (2013.01); C08F 2800/20 (2013.01)] 17 Claims
 
1. An aqueous coating composition comprising an acrylic polymer dissolved in a liquid phase comprising water and a water-miscible solvent, wherein the coating composition comprises at least 50 wt % water, and wherein the acrylic polymer is a film-forming polymer obtained by free radical polymerization of a monomer mixture comprising:
in the range of from 30 to 70 wt % of a poly(ethyleneglycol) (meth)acrylic monomer a. of general formula (I):

OG Complex Work Unit Chemistry
wherein:
R1 is an H atom or a methyl radical;
A is an O atom or a NH radical;
R2 is a H atom, an alkyl radical with 1 to 6 carbon atoms or a phenyl radical; and
n is an integer in the range of from 2 to 100;
in the range of from 2 to 20 wt % of an alkoxysilyl or alkoxyalkylsilyl functional (meth)acrylic monomer b. of general formula (II):
CH2═CR1—CO-A-Ra—[X—Ra]k—Si(R3)(3-n)(OR4)n  (II)
wherein:
R1 is an H atom or a methyl radical;
A is an O atom or a NH radical;
Ra—[X—Ra]k is a group having from 1 to 20 carbon atoms, in which;
each Ra is independently selected from (i) aliphatic hydrocarbon groups, and (ii) aromatic hydrocarbon groups optionally having one or two substituents selected from (i) above; wherein each of the aliphatic hydrocarbon and aromatic hydrocarbon groups in (i) or (ii) above can optionally be substituted with one or more substituents selected from —C1-3 alkyl, —N(Rb)2, and —ORb;
each Rb is independently selected from H and C1-3 alkyl;
X is selected from A, —C(O)O—, —OC(O)—, —C(O)NRb— and —NRbC(O)—;
k is a whole number in the range of from 0 to 3;
n is 1, 2, or 3, preferably is 2 or 3;
R3 and R4 are, independently, an alkyl or an alkoxyalkyl radical with 1 to 6 carbon atoms; and
in the range of from 10 to 68 wt % of a hydrophobic ethylenically unsaturated monomer c. selected from the group consisting of styrene, alkylated styrene, and a (meth)acrylic monomer of general formula (III):
CH2═CR1—CO-A-R5  (III)
wherein:
R1 is an H atom or a methyl radical;
A is an O atom or a NH radical; and
R5 is a hydrocarbon radical with 1 to 18 carbon atoms.
 
14. A substrate coated with a multi-layer coating system comprising:
optionally a primer layer applied to the substrate and deposited from a primer coating composition;
a tie-coat layer applied to the substrate or to the optional primer layer, deposited from a tie-coat composition comprising a binder polymer with curable alkoxysilyl or alkoxyalkylsilyl functional groups dissolved in an organic solvent and comprising less than 10 wt % of water, the tie-coat composition further comprising a silanol condensation catalyst; and
a topcoat layer applied to the tie-coat layer, the topcoat layer deposited from a coating composition according to claim 1.
 
15. A substrate according to claim 14, wherein the binder polymer in the tie-coat composition is a poly(meth)acrylate with curable alkoxysilyl or alkoxyalkylsilyl functional groups.