Mar-resistant oligomeric-based coatings
AssigneeE. I. Du Pont de Nemours and Company
InventorsRobert John Barsotti, Isidor Hazan, Bruce Lyle Neff
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Abstract
A curable coating composition comprising functionalized oligomer components i and ii which cross-link at cure to form a three-dimensional network having chains of substantially uniform, controllable molecular weight between cross-links; oligomers i and ii having weight average molecular weights not exceeding about 3,000, a polydispersity for (i) not exceeding about 1.5, and functionalities that react with one another to cross-link i and ii at cure to yield coatings with an excellent balance of hardness and mar resistance.
Claims1
A substrate coated with a curable coating composition of a binder in an organic solvent, the composition having a volatile organic content not exceeding 0.4 kilograms per liter, consisting essentially of:
- i) a binder selected from a linear or branched cycloaliphatic moiety-containing oligomer or blend of said oligomers with a weight average molecular weight not exceeding 3,000, a polydispersity not exceeding 1.5 and functionality A or A plus B;
- and
- ii) an oligomeric crosslinker or blend of said crosslinkers with a weight average molecular weight not exceeding 3,000 and functionality C;
- components i and ii reacting at cure to form a three-dimensional network having chains of substantially uniform, controllable molecular weight between crosslinks;
- wherein:
- said functionalities in components i and ii are selected from the group consisting of:
- A is hydroxyl and C is isocyanate;
- A is epoxy and C is isocyanate;
- A is hydroxyl and C is melamine;
- A is aldimine or ketimine, B is optionally hydroxyl, and C is isocyanate;
- A is epoxy, B is hydroxyl and C is isocyanate;
- and A is silane, B is hydroxyl and C is melamine.
Dependencies are inferred from the claim text.