Encapsulation by entrapment

US4277364A · kind A · utility

Assignee

• The United States of America, as represented by the Secretary of Agriculture · US

Inventors

• Baruch S. Shasha · Peoria, US
• William M. Doane · Morton, US
• Charles R. Russell · Peoria, US

Key dates

• Filing date: Oct 19, 1976
• Grant date: Jul 7, 1981
• Expiry date: Oct 19, 1996

Classification

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

Abstract

Water-soluble and water-insoluble solid and liquid core materials are encapsulated by the same method. Core materials are simply entrapped in a matrix of water-insoluble polyhydroxy polymers which are insolubilized from their corresponding water-soluble xanthates in the presence of the core materials. Encapsulation of biologically active compositions provides a shield against hostile environments, improves safety in handling, and slows the release of such compounds to the surrounding medium. Highly volatile liquids are protected against losses by evaporation. Encapsulation also provides protection against decomposition from exposure to ultraviolet light.