Ppg Industries, Inc.

Wayne H Tyger

Samuel Porter, Jr

Suryya K Das

Ronald R Ambrose

James B O'Dwyer

B Keith Johnston

Byron K Johnston

David P Zielinski

Raymond F Cornuet, Jr

A method for increasing the resistance of a coating such as a color/clear composite coating to water spotting and acid etching is disclosed. The method involves exposing the coated substrate to ultraviolet radiation after heat curing of the coating.

Method for improving resistance to water spotting and acid etching of

Hydroxyl-containing polymers prepared by reaction of a polymerizable alpha, beta-ethylenically unsaturated carboxylic acid and an epoxy compound containing greater than 5 carbon atoms are disclosed. The polymer is prepared by free radical organic solution polymerization techniques. Synthesis of the polymers by this technique assures multiple hydroxyl functionality in all polymer chains thereby providing good cure response. The polymers are useful as binders in high solids coating compositions. When used with appropriate curing agents, the resultant coatings have good hardness, high gloss and distinctness of image, have good solvent and humidity resistance and are very resistant to acid etching.

Polymers prepared by polymerizing alpha, beta-ethylenically unsaturated

A high solids coating composition having a total solids content of at least 40 percent contains as a film former a urethane vehicle having a hydroxyl value of at least about 50 and a number average molecular weight of no more than 4,000 which is prepared from reactants containing a hydroxyl functional polyether or polyester or mixtures thereof of a molecular weight less than 1,000 and average functionality not exceeding 3 and at least 10 weight percent based on the total weight of hydroxyl functional polyether or polyester or mixtures thereof and polyisocyanate of a polyisocyanate having isocyanate groups separated by one or more hydrophobic moieties, each moiety containing at least 12 consecutive carbon atoms in a continuous chain; and an aminoplast crosslinking agent.

Urethane component for high solids coating compositions

Hydroxyl-containing polymers prepared by reaction of a polymerizable alpha, beta-ethylenically unsaturated carboxylic acid and an epoxy compound containing greater than 5 carbon atoms are disclosed. The polymer is prepared by free radical organic solution polymerization techniques. Synthesis of the polymers by this technique assures multiple hydroxyl functionality in all polymer chains thereby providing good cure response. The polymers are useful as binders in high solids coating compositions. When used with appropriate curing agents, the resultant coatings have good hardness, high gloss and distinctness of image, have good solvent and humidity resistance and are very resistant to acid etching. Preferred reactants are:

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New Kensington, PA, United States of America

Wayne H Tyger