Ppg Industries, Inc.

Robert J Sirkoch

Ken W Niederst

Paul P Greigger

Alan B Weissberg

Ernest A Hahn

Kenneth W Niederst

Calvin C Henning

Disclosed is a method of coating the metal side of a mirror by applying to a reflective layer of metal adhered to a transparent glass sheet one or more adherent protective layers wherein the outermost protective layer is a cured coating formed from a liquid coating composition which is curable by exposure to ultraviolet light (UV). The UV curable liquid coating composition has a high degree of resistance to shrinkage upon curing.

Method for improving durability of mirrors utilizing radiation curable

Compositions of the invention comprise a radiation sensitive compound having ethylenic unsaturation and at least one moiety selected from the group consisting of a urea moiety, a urethane moiety and mixtures thereof, a radiation insensitive compound having a number average molecular weight of at least about 400 comprising at least about 40 percent, by weight, based on the weight of the radiation insensitive compound, of aromatic ring moieties and having a hydroxyl equivalent weight of between about 200 and 1500 and a crosslinking agent reactive with the hydroxyl groups present in said radiation insensitive compound, said crosslinking agent being selected from the group consisting of an aminoplast resin, a blocked isocyanate and mixtures thereof. The composition is capable of being cured using heat and either ultraviolet light or ionizing radiation. A process for applying and curing the composition of the invention on a substrate is also disclosed.

Primer composition

A composition comprising a vinyl resin and a mixture of acrylic compounds each having the formula: ##SPC1## Wherein n is from 0 to 10, or a mixture of acrylic compounds each having the formula: ##SPC2## Wherein n is from 0 to 10, may be coated on to a metal substrate and subjected to ionizing irradiation and used as a primer coating for numerous radiation-sensitive topcoats.

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Pittsburgh, PA, United States of America

Robert J Sirkoch