Imperial Chemical Patents Low VOC Coatings

March 1, 2013

U.S. 8,188,183 B2
Imperial Chemical Industries has been granted a patent for an autoxidisable coating comprised of a liquid dispersion medium and a binder wherein the binder is comprised of an unsaturated copolymer which is produced by reacting at least one unsaturated fatty acid drying oil component and an ethylenically unsaturated monomer,  the unsaturated fatty acid reacts with an oxirane group on the ethylenically unsaturated monomer to yield a first reaction product and subsequently reacting the first reaction product with one or more monomers copolymerizable with the product of the 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 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.