Microcapsules, the production and use thereof

US5596051A · kind A · utility

Assignee

• BASF SE

Inventors

• Ekkehard Jahns · Weinheim, DE
• Burkhardt Dames · Neuwied, DE

Key dates

• Filing date: Jun 24, 1994
• Grant date: Jan 21, 1997
• Expiry date: Jun 24, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2987
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Microcapsules which are composed of a core and of a shell of a polymer, the core containing at least one oil which can be emulsified in water, and which are obtainable by polymerization of oil-soluble monomer mixtures which contain PA0 (a) 1-100% by weight of acrylic anhydride, methacryic anhydride, itaconic anhydride, citraconic anhydride, dimethylmaleic anhydride, 4-vinylbenzoic anhydride, mixed carboxylic anhydrides, mixtures of the said anhydrides and/or more than 40% by weight of maleic anhydride, PA0 (b) 0-99% by weight of at least one monoethylenically unsaturated monomer which is different from the monomers of group (a), PA0 (c) 0-80% by weight of crosslinking monomers which have at least two monoethylenically unsaturated non-conjugated double bonds in the molecule, and PA0 (d) 0-20% by weight of water-soluble monoethylenically unsaturated monomers in the oil phase of a stable oil-in-water emulsion in the presence of polymerization initiators which form free radicals, where the temperature of the polymerizing reaction mixture may be continuously or periodically increased during the polymerization, a process for producing the microcapsules by polymerization of the abovementi…