The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 09, 1999
Filed:
May. 08, 1998
George W Mauer, Brunswick Hills, OH (US);
Donaldson J Emch, Brighton, MI (US);
Roxalana L Martin, Pittsburgh, PA (US);
Edward R Coleridge, Lower Burrell, PA (US);
PPG Industries Ohio, Inc., Cleveland, OH (US);
Abstract
A method of applying a color-plus-clear composite coating to a substrate is provided comprising: applying to the substrate a colored film-forming composition to form a base coat and applying to the base coat a clear film-forming composition to form a transparent top coat over the base coat. Prior to application to the base coat, the clear film-forming composition is heated to a temperature and for a time sufficient to lower its viscosity such that the composition can be atomized and applied as a smooth continuous film. At a temperature of 20-25.degree. C., the clear film-forming composition has a high viscosity such that it cannot be atomized and applied as a smooth continuous film. The clear film-forming composition comprises (1) about 65 to about 85 percent by weight, based on the total weight of resin solids in the clear film-forming composition, of a hydroxyl functional acrylic polymer having a weight average molecular weight of about 5000 to about 25,000 as determined by gel permeation chromatography using a polystyrene standard, and having a glass transition temperature of at least about 10.degree. C.; and (2) about 15 to about 35 percent by weight, based on the total weight of resin solids in the clear film-forming composition, of an aminoplast crosslinking agent.