SE370711

1307585 Cathodically depositable resin product BADISCHE ANILIN & SODA-FABRIK A G 18 June 1970 [19 June 1969] 29554/70 Heading C7B [Also in Division C3] A cathodically depositable coating material comprises a condensation product obtained by the reaction of (a) 40-75 wt. per cent of the reaction product of an epoxy resin with a secondary amine in a ratio of one epoxy group per 0À5-1 amine N atom, with (b) 10-30 wt. per cent of a mixture of a C 7-24 monocarboxylic acid and an adduct or polymer containing at least 2 COOH groups, and reaction of the product with (c) 5-40 wt. per cent of a phenolic or aminoplast resin, which may be etherified with an alcohol, the condensation product being at least partly in the form of a salt of a water-soluble carboxylic acid. Suitable starting materials are (a) epoxy resins from epichlorhydrin or dihalohydrins and glycols, diphenols and bisphenols, and polyols; dialkanolamines and cyclic secondary amines; (b) fatty acids and resin acids; adducts of unsaturated acids; and fatty acids or polybutadienes, acid alkyd resins and addition copolymers of unsaturated acids; and (c) melamine and phenol formaldehyde resins; many are listed. In Examples a bisphenol A/epichlorhydrin resin of epoxy number 0À20-0À225 and hydroxy number 0À32 is stirred with diethanolamine at 100‹C.; then dehydroricinoleic acid or tall oil acids are added at 180‹C., then an acrylic acid/acrylate/acrylamide/ isolinseed oil copolymer or a maleinized linseed oil or a styrene/butadiene/monobutyl maleate/tall oil copolymer; then aqueous resol resin or a butanol solution of the iso or n-butyl ether of hexamethylolmelamine is added at 100‹C; the product resin is mixed with acetic acid and diluted to 10% solids; red iron oxide pigment may be added. The solutions are used for cathodic coating of a deep-drawing metal sheet. Voltages from 70 to 350 volts are specified for the deposition. The coating may be baked at 140 to 200‹C.