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

US6750274B2 · 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: May 16, 2001
• Grant date: Jun 15, 2004
• Expiry date: Oct 28, 2021

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.