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US 4,001,155 AGranted
Paint binders of Mannich bases and epoxy resins
AssigneeBASF SE
InventorsFirtz Erdmann Kempter, Guenther Sabelus, Herbert Spoor
Life of this patent
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Abstract
Paint binders substantially free from epoxide groups and manufactured by reacting A. Mannich bases of A.sub.1. condensed phenols, A.sub.2. a secondary amine bearing at least 1 hydroxyalkyl group and A.sub.3. formaldehyde with B. at least one epoxy resin. These binders are suitable, in the acid-protonized form, for use in cathodic immersion electrocoating of electrically conductive surfaces.
Claims3
An aqueous paint binder for the cathodic electrocoating of electrically conductive metal surfaces, comprising a substantially epoxide group-free reaction product of
- a. Mannich bases of
- a.sub.1. ##SPC4##
- wherein X is a straight-chain or branched-chain divalent aliphatic radical of from 1 to 3 carbon atoms or is >SO.sub.2,>SO or --O--
- a.sub.2. at least one secondary mono amine containing at least one hydroxyalkyl group, or a mixture of said secondary amine with one other secondary or primary mono amine, and
- a.sub.3. formaldehyde or a formaldehyde-donating compound, with
- b. at least one epoxide resin containing 1,2 epoxide groups, the components (a) and (b) being combined in such quantities that from 0.6 to 1.3 epoxide groups of component (b) are present for each molecule of component (a.sub.1).
3 more elements
Dependencies are inferred from the claim text.