Process for the microencapsulation of water-emulsifiable non-thermoplastic substances

US5641535A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Herbert Eck · Burghausen, DE
• Heinrich Hopf · Burghausen, DE
• Gerald Fleischmann · Emmerting, DE
• Ernst Innertsberger · Burghausen, DE
• Jakob Schmidlkofer · Schweich, DE

Key dates

• Filing date: Feb 26, 1992
• Grant date: Jun 24, 1997
• Expiry date: Feb 26, 2012

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J13/043
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the preparation of microencapsulated flakes or powders by drying aqueous mixtures containing (a) one or more water-emulsifiable, non-thermoplastic compounds which have a higher boiling point than water and (b) at least one water-soluble, film-forming polymer, in which the content of component (a) is up to about 95% by weight, based on the dry weight of components (a) and (b), with the proviso that the water-soluble, film-forming polymer has a flocculation point of from 20.degree. to 98.degree. C. or the flocculation point is adjusted to from 20.degree. to 98.degree. C. with the aid of additives, and drying is carried out by thin-layer drying in a temperature range above the flocculation point.