Microencapsulated particles and process for production thereof
US4828955A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1987 |
| Grant date | May 9, 1989 |
| Priority date | — |
| Expiry date | Oct 20, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2989
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Microencapsulated particles each consisting of a mother particle of a core substance and a coating layer of daughter particles formed on the surface of said mother particle, which are obtained by stirring mother particles of a core substance having a number average particle diameter of 1 to 200 .mu.m and either or both of daughter particles (1) of a coating layer-forming material having a number average particle diameter of 1/5 of less of that of the mother particles and fragile daughter particles (2) of a coating layer-forming material having a number average particle diameter of more than 1/5 of that of the mother particles but having a fragility index (Fr) as defined in the specification of 5 or more, at a high speed in an air stream. Said microencapsulated particles can be used in various application fields such as coatings, electronic components and electronograph. In the electronograph filed, in particular, the microencapsulated particles can effectively be used as a toner capable of providing an image of high resolution and good quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.