Process for the preparation of biologically degradable aqueous dispersions

US5750617A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Herbert Eck · Burghausen, DE
• Gerald Fleischmann · Emmerting, DE
• Konrad Alfons Wierer · Sengkofen, DE

Key dates

• Filing date: Aug 5, 1996
• Grant date: May 12, 1998
• Expiry date: Aug 5, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J3/18
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Biologically degradable aqueous dispersions of vinyl ester polymers are provided which have a solids content of 20 to 70% by weight, based on the total weight of the dispersions, and have been prepared by free radical polymerization by the emulsion polymerization process, wherein, in the presence of 10 to 50% by weight, based on the monomer phase, of biologically degradable plasticizer and 0.5 to 15.0% by weight, based on the monomer phase, of biologically degradable emulsifier and/or biologically degradable protective colloid, a monomer phase comprising PA1 a) 50 to 100 parts by weight of one or more vinyl esters from the group comprising vinyl esters of unbranched or branched alkylcarboxylic acids having 1 to 15 C atoms, PA1 b) 0 to 30 parts by weight of ethylene and/or an ester of (meth)acrylic acid or ethylenically unsaturated dicarboxylic acids from alcohols having 1 to 10 atoms and PA1 c) 0 to 20 parts by weight of other mono- or poly-ethylenically unsaturated compounds, is polymerized.