Curable, weldable coating compositions

US6984674B2 · kind B2 · utility

Assignee

• PPG Industries Ohio, Inc. · US

Inventors

• Ralph C. Gray · Butler, US
• Ellor James Van Buskirk · Wexford, US
• Michael J. Pawlik · Glenshaw, US
• Richard M. Nugent, Jr. · Washington, US
• Dennis W. Jones · Glenshaw, US
• Kathleen M. Coldren · Leechburg, US
• Steven D. Perrine · Washington, US
• James E. Jones · Lower Burrell, US

Key dates

• Filing date: Mar 18, 2004
• Grant date: Jan 10, 2006
• Expiry date: Mar 18, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D163/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

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.