Patent EP0272649A2 successfully refreshed from Google Patents.
EP0272649A2
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Spherical fine particulate pigment and process for preparing the same
Assignee: Kao Corp
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Filing: 1987-12-18
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Granted: —
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Expires: 2007-12-18
Abstract
Abstract A spherical fine particulate pigment in which pigment particles have a diameter of not more than 0.5 µ, and the surface thereof is treated by a surface active agent, is provided by reacting a water soluble dye and an insolubilizing agent therefor in a water-in-oil type emulsion aqueous phase which is prepared by using a nonionic surface active agent. The pigment has an excellent dispersing ability and outstanding tinting strength. It has a wide variety of uses in the field of cosmetics, paints, inks, or the like.
Inventors
- 👤 Takeo Imai
- 👤 Kazuko Iwano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 15:37
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/04; C09B; C09B69/00; C09B69/02; C09B69/06; C09B63/00; C09B63/005; C09B67/00; C09B67/0001; C09B67/0004
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
53 words
In a pigment which is a reaction product of a water soluble dye and an insolubilizing agent therefor, a spherical fine particulate pigment characterized in that the pigment particles are spherical in shape, have a diameter of not more than 0.5 µ, and the surface thereof is treated by a surface active agent.
Claim 2
Dependent Claim
53 words
In a pigment which is a reaction product of a water soluble dye and an insolubilizing agent therefor, a spherical fine particulate pigment characterized in that the pigment particles are spherical in shape, have a diameter of not more than 0.5 µ, and the surface thereof is treated by a surface active agent.
Claim 3
Dependent Claim
50 words
A spherical fine particulate pigment as claimed in Claim 1, wherein said water soluble dye is an acidic dye and said insolubilizing agent for said water soluble dye is a basic polyaluminum salt or a salt of a divalent metal selected from the group consisting of calcium, barium, and zirconium.
Claim 4
Dependent Claim
46 words
A spherical fine particulate pigment as claimed in Claim 1, wherein said water soluble dye is a basic dye and said insolubilizing agent for said water soluble dye is tannic acid or a complex acid selected from the group consisting of phosphomolybdic acid and phosphotungstic acid.
Claim 5
Dependent Claim
35 words
A spherical fine particulate pigment as claimed in Claim 1, wherein pigment particles with a particle diameter within ± 25% of an average particle diameter is contained in the amount of not less than 50%.
Claim 6
Dependent Claim
38 words
A process for preparing a spherical fine particulate pigment which comprises reacting a water soluble dye and an insolubilizing agent therefor in a water-in-oil type emulsion aqueous phase which is prepared by using a nonionic surface active agent.
Claim 7
Dependent Claim
38 words
A process for preparing a spherical fine particulate pigment which comprises reacting a water soluble dye and an insolubilizing agent therefor in a water-in-oil type emulsion aqueous phase which is prepared by using a nonionic surface active agent.
References Cited (Backward Citations)
No citation records indexed.
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