C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
400/5472
C09D 133/10 (2006.01) C08G 59/40 (2006.01) C09D 5/38 (2006.01) C08L 61/20 (2006.01)
Patent
CA 1124430
- 39 - ABSTRACT OF THE DISCLOSURE A fast curing, high solids coating composition that is adapted for use as an automotive topcoat and which upon curing forms a hard, glossy, durable coating exhibiting excellent resistance to solvents and water. The coating compositions contains greater than about 60 percent by weight of nonvolatile solids and, exclusive of pigments, solvents and other nonreactive components, consists essentially of: (A) a film-forming copolymer selected from monofunctional copolymers bearing pendant epoxy functionality and bifunctional copolymers bearing hydroxy functionality and pendant epoxy functionality, said copolymers have a number average molecular weight (Mn) of between about 1500 and about 10,000 and a glass transition tempera- ture (Tg) of between about -25° and about 70°C.; (B) at least one organophosphate ester selected from certain mono- and diesters of phosphoric acid; (C) an amino resin crosslinking agent; and (D) optionally a hydroxy functional additive. The organophosphate ester is included in the composition in an amount sufficient to provide between about .67 and about 1.4 equivalents of acid functionality for each equivalent of pendant epoxy functionality of the copolymer of (A), and the amino resin crosslinking agent is included in the compo- sition in an amount sufficient to provide at least about 0.67 equivalents of nitrogen crosslinking functionality for each equivalent of hydroxy functionality included in the composition (i) as a hydroxyl group on said optional hydroxy functional additive, (ii) as a hydroxyl group on said film-forming copolymer or (iii) as a result of esteri- fication of the pendant epoxy functionality of said film- forming copolymer during curing of the composition.
317957
Chattha Mohinder S.
Siwiec Beckwith Elaine C.
Van Oene Henk
Ford Motor Company Of Canada Limited
Sim & Mcburney
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