Bleed alleviation using pH-sensitive agents
US5320668A · kind A · utility
68Cited by
5References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1993 |
| Grant date | Jun 14, 1994 |
| Priority date | — |
| Expiry date | Jan 19, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/0017
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Certain colorants become insoluble under specific and well-defined pH conditions. By forcing a colorant to become insoluble on the page, migration of the colorant is inhibited, thereby helping to reduce bleed between inks of different colors. The colorant 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). In particular, an ink containing a colorant comprising a pigment in combination with a pH sensitive dispersant is used in conjunction with an ink of the appropriate pH.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.