Finely-divided vinyl chloride-ethylene copolymers stabilized by protection colloids

US5124401A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Manfred Selig · Burghausen, DE
• Joachim Schulze · Soest, DE
• Peter Ball · Emmerting, DE
• Klaus Marquardt · Burghausen, DE
• Manfred Hannebaum · Burghausen, DE

Key dates

• Filing date: Jan 27, 1988
• Grant date: Jun 23, 1992
• Expiry date: Jan 27, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F214/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A finely-divided, monomodal protective-colloid stabilized aqueous dispersion of a copolymer of at least 75% by weight of units of vinyl chloride and ethylene and optionally copolymerized with up to 25% by weight of units of additional monomers unsaturated at the ethylene bond and having a solids content of 45 to 70% by weight, characterized in that the dispersions are not partially flocculated, the polymer has a mean particle size of 150 to 500 nm measured as mean weight in a disc centrifuge and a polydispersion index of not more than 1.8 and less than 50% of the polymer particles are larger than 1,000 nm and a process for the preparation thereof using a single step radical polymerization of vinyl chloride, ethylene and optionally additional monomers such as vinyl esters useful as dispersion powders, adhesives, binders and concrete additives.