Process for the production of microcapsules

US4428983A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Ulrich Nehen · Leverkusen, DE
• Manfred Hajek · Leverkusen, DE
• Norbert Weimann · Leverkusen, DE
• Manfred Dahm · Leverkusen, DE

Key dates

• Filing date: Oct 13, 1981
• Grant date: Jan 31, 1984
• Expiry date: Oct 13, 2001

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2989
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for encapsulating products in a polymer by interfacial polymerization, in which a stabilized dispersion of droplets of a first liquid which is to be encapsulated or a stabilized dispersion of solid particles which are to be encapsulated is formed in a continuous phase of a second liquid, and wherein one of the two capsule wall-forming reaction components is present in free form while the other of the two capsule wall-forming reaction components is present in reversibly blocked form, both reaction components are present in the first or second liquid without reacting with one another and the reaction component which is present in reversibly blocked form is deblocked by means of water present in the second or first liquid and then reacts with the reaction component present in free form to form a polymeric capsule wall, the droplets of the first liquid or the solid particles being encapsulated in small capsules consisting of polymeric material.