Method for the production of a low-viscosity, water-soluble polymeric dispersion

US5480934A · kind A · utility

Assignee

• Roehm GmbH Chemische Fabrik · DE

Inventors

• Bernfried Messner · Greensboro, US
• Carl Joachim · Darmstadt, DE
• Gunter Schmitt · Darmstadt, DE
• Manfred Braum · Mainz, DE
• Peter Quis · Darmstadt, DE

Key dates

• Filing date: May 12, 1994
• Grant date: Jan 2, 1996
• Expiry date: May 12, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2300/10
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An aqueous, low-viscosity, water-soluble polymeric dispersion containing a polymer (A) is prepared by copolymerizing monomers: PA1 (a1) 99 to 70 weight % of at least one water-soluble monomer, PA1 (a2) 1 to 30 weight % of at least one hydrophobic monomer and, PA1 (a3) 0 to 20 weight % of at least one amphiphilic monomer, which monomers constitute 100 weight % of the polymers forming material which polymer (A) has an average molecular weight M.sub.W (mean weight) of at least 5.times.10.sup.5 Dalton, said process comprising: PA2 a first step i) of reacting said monomer ingredients in an aqueous dispersion in the presence of at least one polymeric dispersing agent (D) thereby preparing a dispersion of polymer (A); and a second step ii) of adding at least one polymeric dispersion agent (D), in an aqueous solution, to the dispersion.