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US 8,702,943 B2Granted
Electrocoat composition and process replacing phosphate pretreatment
AssigneeBASF Coatings GmbH
InventorsTimothy S December, Abdellatif Chouai, Cynthia A Stants
Life of this patent
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Abstract
An aqueous electrodeposition coating composition comprising a cathodically electrodepositable binder, the binder comprising a phosphorylated resin and a carboxyl group separated by from 2 to 4 carbons from an ester group, provides corrosion protection equivalent to that obtained by the conventional phosphate pretreatment-electrodeposition coating process.
Claims22
An aqueous coating composition comprising a binder, the binder comprising
- (a) a phosphorylated resin,
- (b) a crosslinker for the phosphorylated resin,
- (c) optionally a second, amine-functional resin reactive with the crosslinker, wherein the second, amine-functional resin does not include phosphorous-containing groups,
- wherein the phosphorylated resin or the crosslinker comprises, or the second amine-functional resin is included and comprises, a carboxyl group separated by from 2 to 4 carbons from an ester group, wherein the carboxyl group separated by from two to four carbons from an ester group has a structure
- in which n is 2, 3, or 4 and each of R and R1 is independently selected from H and hydrocarbyl groups having one to four carbon atoms.
2 more elements
Dependencies are inferred from the claim text.