Fanal pigments of closed-ring dry toners containing indamine-and diphenylmethane dyestuffs
US4847177A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1988 |
| Grant date | Jul 11, 1989 |
| Priority date | — |
| Expiry date | Apr 12, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B69/06
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A dry toner for developing latent electrostatic images in electrostatic copying and printing processes contains, as charge-control substance, a pigment of the formula ##STR1## in which A.sup.- represents a silicomolybdate anion, PA0 R.sup.1 and R.sup.3 represent, independently of each other, hydrogen, alkyl or aralkyl, PA0 R.sup.2 and R.sup.4 represent, independently of each other, hydrogen, alkyl, aralkyl or aryl, or PA0 R.sup.1, R.sup.2, R.sup.3 and R.sup.4 represent, independently of each other, members of a five- or six-membered ring produced by linkage with the o-position of the benzene ring or PA0 R.sup.1 and R.sup.2 or R.sup.3 and R.sup.4 jointly represent members of a five- or six-membered ring, PA0 B represents oxygen, sulphur or N--R, PA0 R represents hydrogen, alkyl or aryl and PA0 D represents CH, C--CN or N, in which the two benzene rings may be fused with a further benzene ring and then NR.sup.3 R.sup.4 may also be replaced by hydrogen, and in which the cyclic and acyclic radicals and the benzene rings may be substituted by nonionic radicals usual in dyestuff chemistry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.