Bismuth catalysts useful for curing of cataphoretic deposition coating materials
AssigneeHoechst Aktiengesellschaft
InventorsHartmut Foedde, Markus A. Schafheutle, Achim Voelker, Susanne Wehner, Klausjoerg Klein
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Abstract
Catalysts useful for the curing of, for example, cataphoretic deposition coating materials, including water-soluble bismuth compounds and an epoxy-amine adduct, the preparation of the bismuth compound involving acid being employed in a quantity such that there are less than 2 mol of dissociable protons per mole of bismuth.
Claims18
A composition which is useful as a catalyst for the curing of cataphoretic deposition coating materials, which comprises an epoxy-amine adduct, and a water-soluble bismuth compound,
- wherein the ratio of the number of bismuth atoms to the number of .beta.-hydroxy amine groups in the epoxy amine adduct is from 1:10 to 10:1, and
- wherein the composition is prepared by dissolving a basic bismuth compound in an aqueous acid, which acid is employed in a quantity such that there are between 0.1 mol and less than 2 mol of dissociable protons per mole of bismuth, and then adding thereto a reaction product of at least one epoxide and at least one organic amine as the epoxy-amine adduct,
- and wherein the composition is free of lead compounds and tin compounds.
A process for the preparation of a composition which comprises a bismuth compound and is useful as a catalyst for the curing of cataphoretic deposition coating materials, comprising:
- dissolving one or more basic bismuth compounds in an aqueous acid, and
- adding thereto a reaction product of at least one epoxide compound and at least one organic amine,
- wherein the acid is employed in a quantity such that between 0.1 and less than 2 mol of dissociable protons are present per mole of bismuth,
- whereby a composition comprising the bismuth compound and an epoxy amine adduct and free of lead compounds and tin compounds results.
A process for the preparation of a composition comprising:
- dissolving one or more basic bismuth compounds in an aqueous acid, and
- adding thereto a reaction product of at least one epoxide compound and at least one organic amine,
- wherein the acid is employed in a quantity such that between 0.1 and less than 2 mol of dissociable protons are present per mole of bismuth,
- thereby producing a composition comprising the bismuth compound and an epoxy amine adduct.
Dependencies are inferred from the claim text.