Printer ink composition and printing medium using the same
US5279655A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1992 |
| Grant date | Jan 18, 1994 |
| Priority date | — |
| Expiry date | Apr 24, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A printer ink composition containing a triphenylmethane dye or a lake pigment derived therefrom as a coloring agent, including as the coloring agent a triphenylmethane dye having general formula (I): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are independently hydrogen atom, an alkyl group, an aralkyl group or an aryl group, R.sup.5 is an aryl group, X.sup.- is a counter ion, and ring A or ring B may be substituted by one or more substituents, provided that at least one group among R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is not methyl and in the case that R.sup.5 is p-dimethylaminophenyl, at least one of R.sup.1 and R.sup.2 and at least one of R.sup.3 and R.sup.4 are not methyl; or a lake pigment derived therefrom, in order to prevent the formation of Michler's ketone. The ink composition is used for printing media for printer such as fabric ink ribbon, ink roll, ink-retaining element, thermal transfer ink ribbon, and pressure-sensitive transfer ink ribbon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.