Preparation of stable water-in-oil emulsions of hydrolyzed polymers of N-vinylamides and their use

US5008321A · kind A · utility

Assignee

• BASF SE

Inventors

• Heinrich Hartmann · Schifferstadt, DE
• Walter Denzinger · Speyer, DE
• Michael Kroener · Mannheim, DE
• Norbert Sendhoff · Havelsee, DE
• Enrique Freudenberg · Schifferstadt, DE

Key dates

• Filing date: Nov 20, 1989
• Grant date: Apr 16, 1991
• Expiry date: Nov 20, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2810/50
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Stable water-in-oil emulsions of hydrolyzed polymers of N-vinylamides of the formula ##STR1## where R and R.sup.1 are each H or C.sub.1 -C.sub.6 -alkyl are prepared by polymerization of a compound of the formula I alone or as a mixture with other monoethylenically unsaturated monomers, in the form of a water-in-oil emulsion, to give a water-in-oil polymer emulsion, and subsequent hydrolysis of the polymer, by a process in which hydrolysis of the polymer in the form of the water-in-oil polymer emulsion is carried out in the presence of an acid or base and of from 1 to 30% by weight, based on the polymer, of an emulsifier which is obtainable by PA1 (A) reacting a C.sub.10 -C.sub.22 -fatty alcohol with epichlorohydrin in a molar ratio of from 1:0.5 to 1:1.5 to give a glycidyl ether, PA1 (B) reacting the glycidyl ether with (1) a saturated C.sub.2 -C.sub.6 -alcohol containing from 2 to 6 OH groups or (2) its monoether with a C.sub.10 -C.sub.22 -fatty alcohol, in a molar ratio of glycidyl ether to (1) or (2) of from 1:0.5 to 1:6, in the presence of an acid or base, and PA1 (C) alkoxylating the reaction product from (B) with one or more C.sub.2 -C.sub.4 -alkylene oxides in a molar ratio …