Process for the manufacture of copolymers having increased resistance against hydrolysis, the copolymers and their use

US4397968A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Herbert Eck · Burghausen, DE
• Klaus Adler · Rheda-Wiedenbrück, DE
• Manfred Hannebaum · Burghausen, DE
• Wilhelm Lechner · Burghausen, DE

Key dates

• Filing date: Dec 4, 1981
• Grant date: Aug 9, 1983
• Expiry date: Dec 4, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F20/12
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the production of an aqueous dispersion stabilized by a water-soluble polyvinyl alcohol and based on copolymers that comprise at least 60% by weight of monomer units selected from the group consisting of esters of acrylic acid, esters of methacrylic acid, styrene, and substituted styrene and mixtures thereof, consisting essentially of subjecting a stabilized dispersion of a monomer mixture containing at least 60% by weight of monomers selected from the group consisting of esters of acrylic acid, esters of methacrylic acid, styrene, substituted styrene and mixtures thereof, said dispersion being an aqueous dispersion stabilized by a water-soluble polyvinyl alcohol, to polymerization at a temperature in excess of 60.degree. C. in the presence of a free-radical-forming catalyst selected from the group consisting of (a) organic catalysts soluble in the monomers and also being at least partially water-soluble, optionally in combination with water-soluble reducing agents and (b) peroxosulfur catalysts, in such a manner that, during the entire duration of the reaction, said monomer mixture is supplied at such a rate by metering in the monomer mixture in the form of a previou…