US 2009/0270239 A1 · Black Complex Oxide Particles, Process for Producing the Same, Black Pastes, and Black Matrixes

Abstract

The complex oxide particles of the present invention have a black hue, and contains 35 to 70% by weight of cobalt and 5 to 40% by weight of manganese. The molar ratio of cobalt to manganese Co/Mn is 0.5 to 14. The average particle diameter of primary particles is 0.05 to 0.3 μm. The particles have a shape of octahedral form. The particles are produced preferably through wet oxidation. No firing process is performed. The particles contain substantially no metal elements other than cobalt and manganese. The complex oxide particles of the present invention are suitably used as a black pigment for coating material, ink, toner, and rubbers or plastics.

Claims12

Dependent claims

Black complex oxide particles comprising 35 to 70% by weight of cobalt and 5 to 40% by weight of manganese, having a cobalt to manganese molar ratio Co/Mn of 0.5 to 14, a particle diameter of 0.05 to 0.3 μm averaged for the number of primary particles observed with a scanning electron microscope, and a shape of octahedral form.

Dependencies are inferred from the claim text.

Facts

Application

11/887,557Filed 27 Mar 2006

Priority

JP 2005-1061241 Apr 2005

Published

29 Oct 2009

Term ends

Not estimatedThe source records don’t support an estimate.

Classification27 codes

C09C 1/0009
Treatment of specific inorganic materials other than fibrous fillers ; Preparation of carbon black: pigments for ceramics
C09C 1/00
Treatment of specific inorganic materials other than fibrous fillers
C09D 7/61
Non-macromolecular: inorganic
C09D 7/67
Characterised by particle size: particle size smaller than 100 nm

Black Complex Oxide Particles, Process for Producing the Same, Black Pastes, and Black Matrixes

Life of this patent

Black Complex Oxide Particles, Process for Producing the Same, Black Pastes, and Black Matrixes

Life of this patent

Abstract

Claims12