Microcapsules with a polymeric capsule wall

US5232780A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Oskar Nuyken · Munich, DE
• Brigitte Voit · Munich, DE
• Jochen Dauth · Burghausen, DE

Key dates

• Filing date: Dec 18, 1991
• Grant date: Aug 3, 1993
• Expiry date: Dec 18, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2985
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

In microcapsules with a polymeric capsule wall, the polymer of the capsule wall comprises thermolabile predetermined breaking points in the form of hexamethylenetetramine or acetaldehyde ammonia derivatives in order to facilitate release of the capsule contents (various active substances, such as example, dyes, medicaments, developers, curing agents, flameproofing agents) in a specific manner by exposure to heat.