Aqueous polymer dispersions having a long shelf life

US4952623A · kind A · utility

Assignee

• BASF SE

Inventors

• Gerhard Auchter · Bad Dürkheim, DE
• Thomas Schwerzel · Meckenheim, DE
• Rainer Blum · Ludwigshafen, DE
• Gerhard Neubert · Battenberg, DE
• Eckehardt Wistuba · Bad Dürkheim, DE
• Rolf Osterloh · Lechenich, DE

Key dates

• Filing date: Jun 23, 1988
• Grant date: Aug 28, 1990
• Expiry date: Jun 23, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L33/064
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Aqueous polymer dispersions which have a long shelf life are obtainable by dispersing a mixture of 15-50% by weight of a copolymer (A) of PA0 (I) 1.5-15% by weight of copolymerizable compounds of 3 to 10 carbon atoms which contain a carboxyl or carboxylic anhydride group, PA0 (II) 30-98.5% by weight of C.sub.1 -C.sub.20 -alkyl acrylates or methacrylates, PA0 (III) 0-60% by weight of vinylaromatics, PA0 (IV) 0-20% by weight of copolymerizable carbonyl compounds and PA0 (V) 0-20% by weight of further copolymerizable organic compounds not stated under (I) to (IV) and PA0 50-85% by weight of a copolymer (B) of PA0 40-100% by weight of the monomers (II) and PA0 0-60% by weight of the monomers (III) to (V), PA0 with the proviso that the copolymers (A) and (B) together contain, as components, up to 65% by weight of alkyl (meth)acrylates (II) whose homopolymers have glass transition temperatures of less than 0.degree. C., and that one or both of the copolymers (A) and (B) contain the monomers (IV) as components, PA0 in water with the addition of ammonia and a polyhydrazide (C), and the said dispersions are used for the preparation of finishes and coatings.