Compositions and process for treating metal substrates
First Claim
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1. A composition for passivating metal substrates, which is substantially free of chromium and which comprises:
- a) a Group IIIB or IVB metal or metal compound; and
b) from 100 to 5000 ppm of a reaction product of an epoxy group-containing polymer or oligomer with a mixture of a hydroxy functional acid and a dialkanolamine.
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Abstract
A composition for passivating a metal substrate is provided. The composition is prepared by mixing together:
a) Group IIIB or IVB metal compound; and
b) a reaction product of an epoxy group-containing polymer or oligomer, a hydroxy functional acid and a dialkanolamine. The compositions, which are substantially free of chrome, are used to treat metal substrates prior to the application of a protective or decorative coating.
56 Citations
29 Claims
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1. A composition for passivating metal substrates, which is substantially free of chromium and which comprises:
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a) a Group IIIB or IVB metal or metal compound; and
b) from 100 to 5000 ppm of a reaction product of an epoxy group-containing polymer or oligomer with a mixture of a hydroxy functional acid and a dialkanolamine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
a) after contacting the metal substrate with the composition, electrodepositing a coating on the substrate.
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27. The process of claim 13 further comprising the step of:
a) after contacting the metal substrate with the composition, applying by non-electrophoretic means a primer coating to the substrate.
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28. The process of claim 27 in which the primer coating is a zinc-rich primer coating.
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29. The process of claim 13 further comprising the step of:
a) after contacting the metal substrate with the composition, applying a powder coating composition to the substrate.
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11. A composition for passivating metal substrates, which is substantially free of chromium and which is prepared by mixing together:
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a) a zirconium compound; and
b) a reaction product of a polyglycidyl ether of a polyhydric phenol, dimethylolpropionic acid and a dialkanolamine. - View Dependent Claims (12)
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Specification