Patent · US Expired

Microcapsules and their preparation

US4299723A · kind A · utility

9Cited by

3References

4Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

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

Key dates

Filing date	Mar 10, 1980
Grant date	Nov 10, 1981
Priority date	—
Expiry date	Mar 10, 2000

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2985
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Microcapsules containing a color-former solution which is encapsulated in the form of a solution in an organic solvent in capsules of the polyaddition product of a diisocyanate corresponding to the following general formula: ##STR1## wherein n=3-6 and a diamine wherein a mixture of an alkyl naphthalene and an isoparaffin containing from 10 to 20 carbon atoms is used as the solvent for the color-former and the microcapsules are tempered for at least 2 hours at a temperature of from 60.degree. to 70.degree. C. after their formation.

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