Process for the coating of electrically conducting substrates, aqueous paint, epoxide-amine adduct and use of the epoxide-amine adduct as grinding resin in the production of pigment pastes

US5324404A · kind A · utility

Assignee

• Basf Lacke & Farben Aktiengesellschaft · DE

Inventors

• Gunther Ott · Hachenburg, DE
• Ulrich Heimann · Munster, DE
• Udo Reiter · Telgte, DE
• David J. Santure · Novi, US
• Thomas Brucken · Munster, DE
• Walter Jouck · Munster, DE

Key dates

• Filing date: Jul 28, 1992
• Grant date: Jun 28, 1994
• Expiry date: Jul 28, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D17/001
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

In order to increase the stone chip resistance of automobile finishes aqueous electrocoating paints are used which are produced by the use of a pigment paste which contains as grinding resin an at least partially protonated epoxide-amine adduct which is obtainable by reacting PA0 (A) a glycidyl ether of a polyphenol which contains on statistical average at least one epoxide group in the molecule, or a mixture of such glycidyl ethers, PA0 (B) a polyglycidyl ether of a polyol which contains on statistical average more than 1.0 epoxide groups in the molecule, or a mixture of such polyglycidyl ethers, and PA0 (C) a compound which contains a primary amino group in the molecule or a mixture of such compounds with each other in such a stoichiometric ratio that an epoxide-amine adduct is obtained in which on statistical average at least 2.0 primary amino groups of the component (C) are incorporated in a chain-extending function with the formation of tertiary amino groups and the resultant epoxide-amine addict is at least partially protonated.