	US 12,234,378 B2
	Tie-coat composition
Kevin John Reynolds, Gateshead (GB); Alison Louise Parry, Durham (GB); Robin Alexander Heath, Gateshead (GB); Graeme Dunford, South Shields (GB); and Clayton Price, Whitley Bay (GB)
Assigned to Akzo Nobel Coatings International B.V., Amsterdam (NL)
Appl. No. 17/259,283
Filed by Akzo Nobel Coatings International B.V., Arnhem (NL)
PCT Filed Jul. 10, 2019, PCT No. PCT/EP2019/068505 § 371(c)(1), (2) Date Jan. 11, 2021, PCT Pub. No. WO2020/011839, PCT Pub. Date Jan. 16, 2020.
Claims priority of application No. 18183408 (EP), filed on Jul. 13, 2018.
Prior Publication US 2021/0277256 A1, Sep. 9, 2021
Int. Cl. C09D 5/00 (2006.01); B05D 7/00 (2006.01); C08F 2/38 (2006.01); C08F 220/14 (2006.01); C08F 220/18 (2006.01); C08F 230/08 (2006.01); C08K 5/548 (2006.01); C09D 5/16 (2006.01); C09D 143/04 (2006.01); C09D 183/06 (2006.01); C09D 183/08 (2006.01)

CPC C09D 5/002 (2013.01) [B05D 7/542 (2013.01); C08F 2/38 (2013.01); C08F 220/14 (2013.01); C08F 220/1812 (2020.02); C08F 230/085 (2020.02); C08K 5/548 (2013.01); C09D 5/165 (2013.01); C09D 143/04 (2013.01); C09D 183/06 (2013.01); C09D 183/08 (2013.01); B05D 2420/01 (2013.01); B05D 2420/02 (2013.01)]

23 Claims

1. A substrate coated with a tie-coat layer and a topcoat layer, wherein; the tie-coat layer is deposited from a tie-coat composition comprising one or more binder polymers obtainable by copolymerizing a mixture of ethylenically unsaturated monomers, the one or more binder polymers comprising pendant curable alkoxysilyl functional groups of general formula (I)

—X-L-Si(R¹)_n(OR²)_(3-n) (I)

wherein:

L is a hydrocarbon linker group having 1 to 20 carbon atoms;

X is a heteroatom other than a sulphur atom;

n is 0, 1, or 2;

R¹is an alkyl radical with 1 to 20 carbon atoms; and

R²is an alkyl radical with 1 to 20 carbon atoms or an alkylalkoxy radical with 2 to 20 carbon atoms,

wherein in at least 5 mole % of the curable alkoxysilyl functional groups comprised in the one or more binder polymers, the hydrocarbon linker group L is a methyldiyl group (L1) and in at least 5 mole % of the curable alkoxysilyl functional groups comprised in the one or more binder polymers, the hydrocarbon linker group L is a hydrocarbon group having 2 to 20 carbon atoms (L2), and

wherein the tie-coat composition does not comprise a crosslinking agent; and

wherein the topcoat layer is deposited from a topcoat composition comprising a resin with condensable silane groups.