Pigment composition for liquid toner
US6087434A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 14, 1998 |
| Grant date | Jul 11, 2000 |
| Priority date | — |
| Expiry date | Aug 14, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/122
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A pigment composition for liquid toner comprising a carbon black, a resin and non-aqueous solvent, the carbon black and the resin being dissolved and dispersed in the non-aqueous solvent, and any one of (1) carbon black having a grit content of not more than 10 ppm and an ash content of not more than 0.1% by weight, (2) such carbon black that a value obtained by dividing a total amount of oxygen calculated from a composition of volatile components in carbon black at 1,500.degree. C. by a specific surface area thereof, lies in the range of 0.20 to 0.40 mg/m.sup.2, and (3) such carbon black that when extracted with monochlorobenzene, the content of polynuclear aromatic hydrocarbons in the extract is not more than 30 ppm, being used as the carbon black. The composition is produced by kneading the pigment and the resin together, freeze-pulverizing the mixture and then dissolving and dispersing the resultant particles in the non-aqueous solvent. This pigment composition is useful for liquid toners capable of exhibiting a good image properties having a sufficient print density. It has no influence on human body even when inhaled or ingested.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.