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US 6,146,703 AGranted
Method of Producing High Solids Coating Composition and Coatings Resulting Therefrom
AssigneeE. I. Du Pont de Nemours and Company
InventorsRobert J. Barsotti, Jeffery W. Johnson
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Abstract
A method for producing coating composition exhibiting sprayability at low VOC and excellent performance characteristics as a coating is disclosed. The composition is based on low molecular weight anhydride resin having pendant non-cyclic anhydride moieties and epoxy resin. The composition includes an active catalyst for controlling the volatility of the coating during cure. The composition also includes a surface tension reducing agent that wets the surface during coating application.
Claims5
A method of producing a coating on a substrate, said method comprising:
- applying on said substrate said coating from a heat-curable composition in an organic solvent, said composition comprising:
- an anhydride resin having a weight average molecular weight less than about 2000 that contains a central moiety and an average of at least three pendant, terminal, noncyclic anhydride moieties bonded to each central moiety,
- an oligomer having epoxy functionality of at least 2 and a weight average molecular weight less than about 1500, and
- 0.01 percent to 5 percent by weight based on the weight of said anhydride resin and said oligomer of a surface tension reducing agent for maintaining the surface tension during said application step below about 32 dynes/cm.sup.2 ;
- and
- curing said coating wherein said coating composition includes a functional amount of at least one tertiary amine catalyst sufficient to control the amount of volatiles produced during said cure step at a weight ratio of actual to theoretical solids of above about 95 percent.
3 more elements
Dependencies are inferred from the claim text.