Polymerized titanium dioxide for ultraviolet coatings

Claim 1

A process for ultraviolet coating which comprises: a. forming an aqueous polymer emulsion of alpha beta ethylenically unsaturated vinyl polymerizable monomers utilizing a free radical initiator and up to about 20 percent, by weight, based on the solids content of the formed emulsion, of titanium dioxide; b. precipitating the resulting polymer emulsion utilizing an organic solvent having a boiling point of less than about 70° C.; c. removing water and solvent from the precipitate; d. mixing the dried precipitate with an ultraviolet curable binder in the precipitate to binder ratio, by weight, of about 2-1 to 1-5, wherein said binder contains about 40 to about 100 percent, by weight, of an alpha beta ethylenically unsaturated vinyl polymerizable compound containing at least two sites of alpha beta ethylenic unsaturation and up to about 60 percent, by weight, of an alpha beta ethylenically unsaturated vinyl polymerizable monomer containing no more than one site of alpha beta ethylenic unsaturation, and about 0.1 to about 15 percent, by weight, based upon the ultraviolet curable components, of an ultraviolet photoinitiator; e. applying a coating of the ultraviolet curable mixture; and f. subjecting the coating to ultraviolet light.