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US 4,139,510 AGranted
Process for preparing cathodically depositable coating compositions
AssigneeCelanese Polymer Specialties Company
InventorTerry L. Anderson
Life of this patent
Estimating the term…
Abstract
Polyepoxide resins are adducted with polyamines using an excess of the amine. After the adducting reaction is completed, the excess unreacted polyamine is removed. The adduct is then reacted with a monoepoxide or a monocarboxylic acid. When salted with an acid, the resinous adducts are water soluble or water dispersible. The resin solutions or dispersions are particularly useful in cathodic electrodeposition processes for prime coating metal objects.
Claims10
A process for preparing a resinous composition which comprises
- (A) adducting
- a) a polyepoxide resin derived from a dihydric phenol and an epihalohydrin, said polyepoxide resin having a 1,2-epoxide equivalent weight of about 400 to about 4000, with
- b) a polyamine having at least 2 amine nitrogen atoms per molecule, at least 3 amine hydrogen atom per molecule and no other groups reactive with epoxide groups;
- and
- wherein at least 1.5 mols of (b) are present for each epoxide equivalent of (a) and wherein the reaction is continued until all of the epoxide groups have reacted with amine groups;
- (B) removing by distillation the unreacted polyalkylene polyamine;
- and
- (C) reacting at a temperature of about 300.degree. F. to aout 500.degree. F. the so formed adduct with a monocarboxylic acid which contains one carboxylic acid group and no other groups reactive with amine groups, said monocarboxylic acid having about 8 to 24 carbon atoms per molecule
- wherein about 2 to about 6 mols of (C) are reacted per each mol of (A) and wherein said resinous composition has a weight per active nitrogen of about 200 to about 600.
6 more elements
Dependencies are inferred from the claim text.