Aqueous polymer dispersions having a long shelf life

US4931494A · kind A · utility

Assignee

• BASF SE

Inventors

• Gerhard Auchter · Bad Dürkheim, DE
• Thomas Schwerzel · Meckenheim, DE
• Rolf Osterloh · Lechenich, DE
• Gerhard Neubert · Battenberg, DE
• Peter Pfoehler · Speyer, DE
• Wolfgang Druschke
• Helmut Jaeger · Worms, DE

Key dates

• Filing date: Jun 23, 1988
• Grant date: Jun 5, 1990
• Expiry date: Jun 23, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2666/28
• 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 from 15 to 70% by weight of a copolymer (A) of PA0 (I) from 1.5 to 15% by weight of copolymerizable compounds of 3 to 10 carbon atoms which contain a carboxyl or carboxylic anhydride group, PA0 (II) from 65 to 98.5% by weight of C.sub.1 -C.sub.20 -alkyl acrylates or methacrylates, PA0 (III) from 0 to 20% by weight of vinylaromatics, PA0 (IV) from 0 to 20% by weight of copolymerizable carbonyl compounds and PA0 (V) from 0 to 10% by weight of further copolymerizable organic compounds not stated under (I) to (IV), and from 30to 85% by weight of a copolymer (B) of from 60 to 100% by weight of the monomers (II) and from 0 to 40% by weight of the monomers (III) to (V), with the proviso that the copolymers (A) and (B) together contain, as components, more than 65% by weight of alkyl (meth)acrylates (II) whose homopolymers have glass transition temperatures of less than 0.degree. C., and that one or more of the copolymers (A) and (B) contain the monomers (IV) as components, in water with the addition of ammonia and a polyhydrazide (C), and the said dispersions are used as pressure sensitive a…