Ppg Industries Ohio, Inc.

James E Jones

Michael J Pawlik

Richard M Nugent, Jr

Ellor James Van Buskirk

Ralph C Gray

Dennis W Jones

Steven D Perrine

Randal L Campbell

Kathleen M Coldren

Ronald R Ambrose

David A Diehl

Ljiljana Maksimovic

Gerald W Gruber

Novel compositions comprising photoactive polymers comprising a dinitrobenzyl group in conjunction with a photoacid generator are disclosed. In one embodiment, the photoacid generator is a diazide and/or a sulfonyl aceto carbonyl compound. The photoacid generators are typically used in amounts of 10 weight percent or less. The compositions find particular application in storage stable, pH stable, and water stable positive photoresist compositions. Such compositions demonstrate reduced process time as compared with similar compositions lacking the photoacid generator. Methods for using these compositions are also disclosed.

Positive photoresist compositions having enhanced processing time

A curable coating composition is disclosed comprising a resinous binder comprising (a) a reaction product of an epoxy-containing polymer with a compound containing phosphorus acid groups, the reaction product having reactive functional groups, and (b) a curing agent having functional groups reactive with the functional groups of (a). An electroconductive pigment is dispersed in (a) such that the weight ratio of the electroconductive pigment to (a) plus (b) is within the range of 0.5 to 9.0:1. When the curable coating composition is deposited and cured on a metal substrate, the cured coating is weldable.

Curable, weldable coating compositions

Weldable coating of phosphated epoxy polymer, curing agent and electroconductive pigment

Methods for treating a photoresist by exposure to light from an electrodeless UV bulb are disclosed. The methods are applicable to both positive and negative photoresists. In the case of positive photoresists, use of electrodeless UV lamps significantly reduces the UV exposure time. Methods for making circuit boards and apparatus for making circuit boards are also disclosed.

Method of treating photoresists using electrodeless UV lamps

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Butler, PA, United States of America

James E Jones