Tie-coat composition

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;
• R1 is an alkyl radical with 1 to 20 carbon atoms;
• and
• R2 is 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.