Patent · US Expired

Process for the continuous production of microcapsules

US4761255A · kind A · utility

38Cited by

4References

4Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Manfred Dahm · Leverkusen, DE
Gert Jabs
Bernd Koglin · Bensberg, DE
Hildegard Schnoring · Wuppertal, DE

Key dates

Filing date	Apr 24, 1987
Grant date	Aug 2, 1988
Priority date	—
Expiry date	Apr 24, 2007

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2989
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A continuous process for the production of microcapsules having polymeric walls and a solid or liquid core which comprises mixing a polyisocyanate with the material to be encapsulated, reacting the resulting mixture, a polyamine, and an aqueous phase containing a dispersion aid, the reaction being initiated in a high-turbulence mixing zone to form an emulsion, and subsequently transferring the reaction product to a multiple-stage cascade of vessels, the temperature being increased from stage to stage and being kept constant during each stage.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.