Microcapsule and micromatrix bodies and method for their formation

US4931362A · kind A · utility

Assignees

• F.Joh.Kwizda Gesellschaft m.b.H. · AT
• Th. Goldschmidt. AG · DE

Inventors

• Wilhelm Zsifkovits · Stockerau, AT
• Burghard Gruning · Essen, DE
• Hans-Joachim Kollmeier · Essen, DE
• Dietmar Schaefer · Hattingen, DE
• Christian Weitemeyer · Essen, DE

Key dates

• Filing date: Aug 18, 1988
• Grant date: Jun 5, 1990
• Expiry date: Aug 18, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2987
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

An organic phase which comprises a water-insoluble material to be encapsulated, a capsule-forming or matrix-forming monomer or prepolymer and, should this be desirable, a solvent, is dispersed in droplet form in an aqueous phase. The capsule-forming or matrix-forming monomer or prepolymer forms a sheath around the material to be encapsulated. As a capsule-forming or matrix-forming monomer, an organosilicon compound of the general formula ##STR1## is used, wherein R.sup.1 is a linear or branched, saturated or unsaturated, n-functional hydrocarbon moiety, which may be interrupted by groups containing oxygen, nitrogen or sulfur; R.sup.2 and R.sup.3 are the same or different and represent a hydrocarbon moiety with 1 to 6 carbon atoms or X; X is a hydroxyl group or a hydrolyzable group and n is a whole number greater than or equal to 1, with the proviso that, when n=1, R.sup.1 has at least 12 carbon atoms and R.sup.2 and R.sup.3 represent X or a prepolymer hereof. The method can be carried out easily and requires only one compound to form the capsules or micromatrix bodies. In the implementation of the method, no foam occurs and the method results in end products with an acceptable shel…