Water-dispersible hybrid polymer
AssigneeAkzo Nobel N.V.
InventorsRoelof Buter, Andreas H. J. Roelofs
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Abstract
A water-dispersible hybrid polymer comprises an ethylenically unsaturated polyurethane (core) onto which an addition polymer chain (shell) has been provided by polymerization, with the unsaturation of the polyurethane being achieved by the incorporation therein of dimethyl-m-isopropenyl benzyl isocyanate, and the acid number of the shell polymer being in the range of 30 to 120 (mg KOH/g). Aqueous dispersions of these hybrid polymers are pre-eminently suitable for use in aqueous coating compositions of the so-called clear coat type, particularly when stringent demands are imposed with regard to the acid resistance of the topcoats applied using these compositions.
Claims19
A water-dispersible hybrid polymer comprising an ethylenically unsaturated polyurethane (core) onto which an addition polymer chain (shell) has been covalently bonded by means of copolymerization with the ethylenically unsaturated bond of the polyurethane, wherein the unsaturation of the polyurethane has been achieved by the incorporation therein of dimethyl-m-isopropenylbenzylisocyanate, and the acid number of the shell polymer is in the range of 30 to 120 (mg/KOH/g).
Dependencies are inferred from the claim text.