Manufacture of shear-resistant aqueous copolymer emulsions

US4051093A · kind A · utility

Assignee

• BASF SE

Inventors

• Kurt Wendel
• Fritz Reichel · Hirschberg, DE
• Christof Taubitz · Monsheim, DE

Key dates

• Filing date: Oct 29, 1975
• Grant date: Sep 27, 1977
• Expiry date: Oct 29, 1995

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H17/455
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Shear-resistant aqueous copolymer emulsions which can be used for sizing paper are manufactured by first copolymerizing, in the aqueous phase of an aqueous emulsion, using conventional polymerization initiators which form free radicals, (A) from 0.5 to 15 per cent by weight of monomers containing a polymerizable C.dbd.C bond and at least one carboxyl and/or sulfonic acid or phosphate or phosphite group with (B) from 5 to 30 per cent by weight of monomers containing a C.dbd.C bond and a tertiary or quaternary amino group, or a nitrogen-containing heterocyclic group, and then adding, while continuing the copolymerization, (C) from 0 to 94.5 per cent by weight of styrene and/or acrylonitrile and (D) from 0 to 94.5 per cent by weight of acrylic or methacrylic acid esters of alkanols of 1 to 8 carbon atoms as well as (E) from 0 to 30 per cent by weight of further olefinically unsaturated monomers, and completing the polymerization, the pH during the polymerization being less than 7 and the amount of monomers (C) and (D) together being at least 25 per cent by weight.