Process for the preparation of aqueous epoxy resin dispersions

US5236974A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Hans-Dieter Dreischhoff · Wiesbaden, DE
• Joerg-Peter Geisler · Ingelheim am Rhein, DE
• Claus Godau · Kiedrich, DE
• Michael Hoenel · Wiesbaden, DE

Key dates

• Filing date: Aug 26, 1992
• Grant date: Aug 17, 1993
• Expiry date: Aug 26, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2363/00
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for the preparation of aqueous epoxy resin dispersions comprising PA0 (1) 20 to 75% by weight, based on the total dispersion, of an epoxy resin constituting a condensation product of PA1 a) epoxy compounds having at least one epoxy group per molecule and an epoxide equivalent weight of 90 to 3000 g/mol, and PA1 b) aromatic polyols; PA0 (2) 3 to 20% by weight, based on the total dispersion, of an emulsifier comprising PA1 a) a condensation product of an aliphatic polyol and an epoxy compound having at least two epoxy groups per molecule and an epoxide equivalent weight of 90 to 3000 g/mol, the equivalent ratio of the OH groups to the epoxy groups being 1:0.85 to 1:1.5 and the epoxide equivalent weight of this condensation product being between 5000 and 400,000 g/mol, PA1 b) an organic solvent, and PA1 c) water; PA0 (3) up to 10% by weight, based on the total dispersion, of organic solvents; and PA0 (4) water in an amount to make up to 100% by weight, which comprises stirring the epoxy resin (1) firstly with the emulsifier (2) and, if appropriate, organic solvents corresponding to (3), and then with water.