Microcapsules, printing inks and their production
US4729792A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 22, 1986 |
| Grant date | Mar 8, 1988 |
| Priority date | — |
| Expiry date | May 22, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2985
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Microcapsules having hard, thick walls are formed by dispersing an oily solution containing a crosslinking agent in an aqueous solution, and forming a polysalt in the aqueous solution, the polysalt including a high molecular weight polyanion and a polycationic polyamine having a functionality of at least three. The polyanion is preferably casein. If the surface of the microcapsules formed in the aqueous solution is lipophilized, the microcapsules easily separate from the solution by filtration. By use of a suitable wetting agent, the filter cake can be used in place of the pigment in any conventional printing ink. The microcapsules may be used in carbonless copy paper technology.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.