Binder for coating compositions and its use

US4296006A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Volker Bugdahl · Hanau, DE
• Gerhard Morlock · Hanau, DE
• Werner Reidt · Hanau, DE
• Emil Kerschner · Rodenbach, DE

Key dates

• Filing date: Feb 19, 1980
• Grant date: Oct 20, 1981
• Expiry date: Feb 19, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D4/06
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

There is provided a binder for coating compositions based on a mixture of an unsaturated .beta.-hydroxy ester with copolymerizable monomers. The binder consists essentially of, on a total weight basis, (A) 25 to 60 weight percent of an unsaturated .beta.-hydroxy ester which is produced by reacting an epoxy resin based on bisphenol A and epichlorohydrin with a molecular weight between 800 and 3000 and an epoxide equivalent weight between 400 and 2500 with a mixture of PA1 (a) 74 to 64 mole percent of methacrylic acid and/or acrylic acid and PA1 (b) 26 to 36 mole percent of at least one saturated monocarboxylic acid having 8 to 20 carbon atoms or a mixture of at least one saturated monocarboxylic acid having 8 to 20 carbon atoms with up to 20 mole percent of an unsaturated monocarboxylic acid having 8 to 20 carbon atoms, and (B) 75 to 40 weight percent of a mixture based on the weight of component (B) of PA1 (a) 70 to 95 weight percent methyl methacrylate, PA1 (b) 30 to 5 weight percent of at least one monomer of the formula CH.sub.2 .dbd.CR.sub.1 --COOR.sub.2 where R.sub.1 is hydrogen or a methyl group and R.sub.2 is a straight chain alkyl group with 4 to 10 carbon atoms, a branched…