Production of microcapsules having walls of polyaddition products of water-insoluble polyamines with water-soluble polyisocyanate adducts

US4517141A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Manfred Dahm · Leverkusen, DE
• Norbert Weimann · Leverkusen, DE
• Ulrich Nehen · Leverkusen, DE
• Hanns P. Muller · Leverkusen, DE
• Gert Jabs
• Albert Awater · Odenthal, DE
• James-Michael Barnes · Breitscheid, DE

Key dates

• Filing date: Jun 21, 1983
• Grant date: May 14, 1985
• Expiry date: Jun 21, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2989
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Microcapsules having a hydrophobic core material and capsule walls formed by the reaction of water-insoluble polyamines with water-soluble bisulphite adducts of polyisocyanates, a process for the production thereof which is characterized in that a mixture of a hydrophobic core material and water-insoluble polyamines is emulsified in water or in an aqueous protective colloid solution to the required particle size, water-soluble bisulphite adducts of polyisocyanates in the form of powders or aqueous solutions are added and the mixture is left to react to completion at temperatures of from 1.degree. to 140.degree. C., and applications thereof.