Patent ID: 8512465
Filing Date: 2013-08-20
Classification: C09D

Abstract:
1. A method for improving adhesion of a solid paint film to a substrate, wherein said substrate comprises an aged organic coating, comprising adding an additive to a paint, wherein the additive comprises copolymers comprising: (A) 15 to 40 wt % of at least one ethylenically unsaturated N-vinyl lactam monomer, with the exception of vinylpyrrolidone; (B) optionally 2 to 10 wt % of at least one ethylenically unsaturated macromonomer with a number average molecular weight (Mn) molecular weight of 200 to 5,000 and having a single ethylenically unsaturated end group; and (C) 10 to 80% wt % of at least one polymerisable imidazole derivative; wherein components (A), (B) when present, and (C), along with other monomeric components, make up 100 wt %; wherein the fraction of the additive in the paint is 0.05% to 5% by weight, based on the total weight of the paint including the additive; and coating the substrate comprising an aged organic coating with the paint and forming a solid paint film on the substrate.