Process for emulsion polymerization

US4859751A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Joachim Schulze · Soest, DE
• Klaus Adler · Rheda-Wiedenbrück, DE
• Manfred Selig · Burghausen, DE
• Peter Ball · Emmerting, DE
• Klaus Marquardt · Burghausen, DE
• Otmar Killermann · Simbach, DE
• Manfred Hannebaum · Burghausen, DE

Key dates

• Filing date: Oct 29, 1984
• Grant date: Aug 22, 1989
• Expiry date: Oct 29, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2327/06
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A novel process for the preparation of a readily dispersible, pourable dispersion powder comprising emulsion polymerizing in the presence of a free radial initiator a mixture of 1 to 50% by weight of ethylene and 99 to 50% by weight of an ethylenically unsaturated comonomer phase comprising at least one member of the group consisting of (a) 60 to 100% by weight of vinyl chloride, (b) 0 to 40% by weight of monoethylically unsaturated, oil-soluble monomers, (c) 0 to 10% by weight of monoethylenically unsaturated water-soluble monomers having functional groups and (d) 0 to 5% by weight of oil-soluble monomers that are monoethylenically unsaturated and have functional groups or are multiple ethylenically unsaturated and optionally a protective colloid and/or emulsifier at an ethylene pressure of 10 to 150 bar to obtain an aqueous dispersion of a vinyl chloride-ethyelene copolymer, optionally adding to the aqueous dispersion (e) 0 to 40% by weight, based on the VCE-polymer, of at least one water-soluble substance having a T.sub.g .gtoreq.60.degree. C., (f) 0 to 1% by weight, based on the VCE-polymer, of an antifoaming agent, and (g) 0 to 30% by weight, based on the total weight of polym…