UV light treatment of clear coat to improve acid etch resistance

US5532027A · kind A · utility

Assignee

• E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

• J. David Nordstrom · Detroit, US
• Hisanori Omura · Clarkston, US
• Alan E. Smith · Dover, US
• David M. Thomson · Montréal, CA

Key dates

• Filing date: Dec 21, 1994
• Grant date: Jul 2, 1996
• Expiry date: Dec 21, 2014

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B05D3/065
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

An improved process which comprises applying a layer of a color coating composition to a substrate used for the exterior of a motor vehicle and then applying a layer of a clear coating composition to the color coating and curing the resulting clear coat/color coat layer; the improvement is the use of a clear coating composition containing a film forming binder of an acrylosilane polymer and exposing the clear coat layer after curing to an artificial source of UV light under ambient temperatures and atmospheric conditions in an amount sufficient to improve the resistance of the clear coat to water spotting and acid etching when exposed to natural weathering conditions.