Method for the production of a dispersion of colorless chromogenic material
US4668291A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1983 |
| Grant date | May 26, 1987 |
| Priority date | — |
| Expiry date | Jul 22, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/30
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In the method for the production of a dispersion of colorless chromogenic material useful for the production of a heat-sensitive record material, a colorless chromogenic material and a heat fusible material are admixed together and heated to form a co-melt, the co-melt is dispersed in hot water having a temperature higher than the solidifying point of the co-melt to form an emulsion without causing solidification of the co-melt, and then the emulsion thus obtained is further dispersed in a water having a temperature lower than the solidification point of the co-melt to form a dispersion in which solid particles of the co-melt are dispersed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.