Bleed alleviation using pH-sensitive dyes
US5181045A · kind A · utility
68Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1991 |
| Grant date | Jan 19, 1993 |
| Priority date | — |
| Expiry date | Sep 23, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M7/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Certain dyes become insoluble under specific and well-defined pH conditions. By forcing a dye to become insoluble on the page, migration of the dye is inhibited, thereby helping to reduce bleed between inks of different colors. The dye is forced out of solution from the ink by contact with another ink having the appropriate pH (either higher or lower than that of the first ink).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.