Scratch resistant curable coating composition
OwnerThomas Stauntoninventor
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Abstract
This invention relates to a curable composition comprising a solvent solution of a mixture comprising: (i) at least one hydroxy-functional acrylic polymer; and (ii) optionally, at least one low molecular weight polyol reactive diluent; (iii) at least one polyisocyanate; (iv) an amino-functional silane; (v) a metal catalyst, such as a tin compound, for accelerating the isocyanate/hydroxyl reaction; and (vi) a low boiling acid.
Claims23
A curable composition comprising a solvent solution of a mixture comprising:
- (i) at least one hydroxy-functional acrylic polymer;
- and
- (ii) at least one low molecular weight polyol reactive diluent;
- (iii) at least one polyisocyanate;
- (iv) an amino-funcational silane;
- (v) a metal catalyst for accelerating the isocyanate/hydroxyl reaction;
- and
- (vi) an acid having a boiling point below about 200° C.
A curable composition comprising (on a weight solids basis of the vehicle solids):
- (i) about 20% to about 70% parts of a hydroxy functional acrylic polymer having a number average molecular weight less than about 3,000;
- (ii) about 2% to about 30% of a low molecular weight polyol reactive diluent;
- (iii) about 10% to about 55% of a polyisocyanate;
- (iv) about 1% to about 50% of an amino-funcational silane;
- (v) at least about 0.01% of a tin catalyst compound;
- and
- (vi) about 0.1 to about 3.0% of a low boiling acid.
In a substrate coated with a multi-layer decorative and/or protective coating which comprises:
- (a) a basecoat comprising a pigmented film-forming polymer;
- and
- (b) a transparent clearcoat comprising a film-forming polymer applied to the surface of the basecoat composition;
- wherein the clearcoat is a curable composition comprising:
- (i) at least one hydroxy-functional acrylic polymer;
- (ii) at least one low molecular weight polyol reactive diluent;
- (iii) at least one polyisocyanate;
- (iv) an amino-functional silane;
- (v) a metal catalyst for accelerating the isocyanate/hydroxyl reaction;
- and
- (vi) an acid having a boiling point below about 200° C.
Dependencies are inferred from the claim text.