Chip- and abrasion-resistant polyurethane coating composition having improved adhesion
AssigneeMinnesota Mining and Manufacturing Company
InventorHans T. Oien
Life of this patent
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Abstract
The invention is a coating composition which includes fully reacted, solvent-soluble polyurethane, an adhesion-promoting amount of vinyl chloride-vinyl ester copolymer, and a solvent for the polyurethane and the copolymer to make the composition coatable. A method of coating is also provided comprising applying to a surface the coating composition and permitting the coating composition to dry. The invention further provides a surface coated with the dry coating composition.
Claims9
A composition capable upon drying by solvent evaporation of providing a clear chip- and abrasion-resistant coating having improved adhesion to acrylic surfaces, said composition comprising:
- (a) fully reacted solvent-soluble polyurethane derived from an aliphatic diisocyanate;
- (b) an adhesion-promoting amount of vinyl chloride-vinyl ester copolymer;
- and
- (c) solvent for said polyurethane and said copolymer to make said composition coatable
- wherein said adhesion-promoting amount of said vinyl chloride-vinyl ester copolymer comprises from about 5 to about 30 parts by weight based on 100 parts of the composition on a dry solvent-free basis.
An acrylic surface coated with a clear coating comprising fully reacted, solvent-soluble aliphatic polyurethane and an adhesion-promoting amount of vinyl chloride-vinyl ester copolymer wherein said adhesion-promoting amount of said vinyl chloride-vinyl ester copolymer comprises from about 5 to about 30 parts by weight based on 100 parts of the composition on a dry solvent-free basis.
Dependencies are inferred from the claim text.