Process for the preparation of water dilutable binders for cationic electrocoating finishes using monofunctionally modified polyepoxides

US5003025A · kind A · utility

Assignee

• Basf Lacke & Farben Aktiengesellschaft · DE

Inventors

• Arnold Dobbelstein · Cologne, DE
• Michael Geist · Munster, DE
• Gunther Ott · Hachenburg, DE
• Georg Schon · Everswinkel, DE

Key dates

• Filing date: Dec 20, 1989
• Grant date: Mar 26, 1991
• Expiry date: Dec 20, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G59/1433
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to water-dilutable binders for cationic electrocoating finishes. For the preparation of the binders, a di-epoxide compound, together with at least one mono-epoxide compound if desired, is converted by a polyaddition, carried out at 100.degree. to 195.degree. C. and initiated by a monofunctionally reacting initiator carrying either an alcoholic OH group, a phenolic OH group or an SH group, to form an epoxy resin which then subsequently is modified with PA0 (A) primary and/or secondary amines or their salts and/or the salt of a tertiary amine, a sulfide/acid mixture or a phosphine/acid mixture and with, if desired, PA0 (B) a polyfunctional alcohol, a polycarboxylic acid, a polysulfide or a polyphenol.