Aqueous copolymer dispersions of water-soluble monomers with N-vinyl groups and hydrophobic monomers

US6107397A · kind A · utility

Assignee

• BASF SE

Inventors

• Rainer Blankenburg · Kornwestheim, DE
• Volker Schehlmann · Schifferstadt, DE
• Karl Kolter · Ludwigshafen am Rhein, DE

Key dates

• Filing date: Mar 17, 1998
• Grant date: Aug 22, 2000
• Expiry date: Mar 17, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F226/00
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

An aqueous copolymer dispersion is prepared by free-radical emulsion co-polymerization of a monomer mixture of PA1 i) from 10 to 70% by weight of at least one nonionic monomer A having a water-solubility of more than 60 g/l at 25.degree. C., and being selected from the group consisting of N-vinyllactams having from 6 to 8 carbon atoms, N-vinylformamide and N-methyl-N-vinylacetamide, PA1 ii) from 30 to 90% by weight of at least one monoethylenically unsaturated hydrophobic monomer B having a water-solubility of less than 60 g/l at 25.degree. C., and optionally further comprising PA1 iii) up to 5% by weight of at least one monoethylenically unsaturated monomer C which has at least one ionic and/or ionizable functional group, PA1 iv) up to 10% by weight of at least one monomer D which has at least 2 ethylenically unsaturated bonds, PA1 v) up to 20% by weight of at least one further monoethylenically unsaturated monomer E, which is different from the monomers A and C, and has a water-solubility of >60 g/l at 25.degree. C., in the presence of a water-soluble polymerization initiator in water or an aqueous solvent.