Spray drying of microcapsule dispersions

US4489017A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Heinrich Alberts
• Manfred Dahm · Leverkusen, DE
• Gert Jabs
• Christian Wegner · Cologne, DE

Key dates

• Filing date: Jul 12, 1983
• Grant date: Dec 18, 1984
• Expiry date: Jul 12, 2003

Classification

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

Abstract

A process for spray drying aqueous suspensions of microcapsules having walls of polyurea which have been formed in known manner from polyisocyanate and polyamine by interface polyaddition, in which from 1 to 10 parts by weight, based on the microcapsules, of a water-soluble silicate and/or a water-soluble alkaline earth metal salt or hydroxide are added to the aqueous reaction mixture of polyisocyanate and polyamine.