Patent ID: 8188183

Claim:
An autoxidisable coating composition comprising a liquid dispersion medium and a binder wherein the binder comprises an unsaturated copolymer which is produced by i) reacting at least one unsaturated fatty acid drying oil component and an ethylenically unsaturated monomer, wherein the unsaturated fatty acid reacts with an oxirane group on said ethylenically unsaturated monomer to yield a first reaction product and ii) subsequently reacting said first reaction product with one or more monomers copolymerisable with the product of said first reaction and selected from the group consisting of acrylic acid esters, methacrylic acid esters, acrylic acid, methacrylic acid, acrylic acid esters of aliphatic alcohols, acrylic acid esters or aromatic alcohols, methacrylic acid esters of aliphatic alcohols, methacrylic acid esters of aromatic alcohols, styrene, substituted styrenes, vinyl carboxylate esters, and vinyl carboxylate olefins selected from ethylene, propylene or butene-1 and styrene or its homologues and wherein at least 15% by weight of the binder is present as microgel, which is the result of the two reaction steps and which is insoluble in tetrahydrofuran.