Methods of making oligomers, coating compositions containing them, and coated articles

US8629231B2 · kind B2 · utility

Assignee

• BASF COATINGS GMBH · DE

Inventors

• Nicholas Caiozzo · St. Clair Shores, US
• Walter H. Ohrbom · Wixom, US
• David Cranfill · Brighton, US

Key dates

• Filing date: May 20, 2009
• Grant date: Jan 14, 2014
• Expiry date: May 15, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D175/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An oligomer is made by capping a uretdione compound of structurewith a compound (II) having an active hydrogen and a carbamate or cyclic carbonate group under conditions in which the isocyanate groups but not the uretdione group react. The product (III) is either reacted with a reactant having at least two active hydrogens under reaction conditions that cleave the uretdione ring, after which any cyclic carbonate groups may be converted to carbamate groups, or a product (III) having cyclic carbonate groups is reacted with ammonia or primary amine to provide uretdione with a hydroxy carbamate group that is then self-condensed under uretdione ring-opening conditions. A curable coating composition comprises the oligomer; a coated article is prepared by applying a layer of the curable coating composition and curing the applied layer.