Coloring agent composition and method for producing same

Patent metadata

Field	Value
Publication number	US-9630884-B2
Application number	US-201414912220-A
Country	US
Kind code	B2
Filing date	Sep 18, 2014
Priority date	Sep 30, 2013
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

Provided is a coloring agent composition to be added to a gypsum-containing raw material powder constituting a gypsum product and to be used for coloring the gypsum product, the coloring agent composition being a powder containing a pigment, calcined gypsum, and amorphous silica. A process for producing the coloring agent composition includes a first step of mixing a pigment, calcined gypsum, and amorphous silica to obtain a mixed powder. Use of the coloring agent composition makes it possible to easily produce gypsum products such as a powder and a hardened body that are excellent in colorability.

First claim

The invention claimed is:

1. A coloring agent composition to be added to a gypsum-containing raw material powder forming a gypsum product and to be used for coloring the gypsum product, the coloring agent composition consisting essentially of:
a pigment;
calcined gypsum; and
amorphous silica,
wherein the amorphous silica has a number average particle diameter in a range from 5 to 40 nm,
the calcined gypsum is a hemihydrate gypsum, β hemihydrate gypsum, or a mixture thereof, and
the coloring agent composition is in a powder form.

2. The coloring agent composition according to claim 1 , wherein a content of the amorphous silica is in a range from 0.01 to 1 part by mass relative to 1 part by mass of the pigment.

3. The coloring agent composition according to claim 1 , wherein a content of the calcined gypsum is in a range from 1 to 100 parts by mass relative to 1 part by mass of the pigment.

4. The coloring agent composition according to claim 1 ,
wherein the amorphous silica has a number average particle diameter in a range from 5 to 30 nm.

5. The coloring agent composition according to claim 1 ,
wherein the pigment, the calcined gypsum, and the amorphous silica have been co-pulverized.

6. A process for producing the coloring agent composition according to claim 1 , the process comprising:
a first step of mixing the pigment, the calcined gypsum, and the amorphous silica so as to form a mixed powder.

7. The process for producing the coloring agent composition according to claim 6 ,
wherein the pigment, the calcined gypsum, and the amorphous silica are pulverized concurrently with the mixing in the first step.

8. The process for producing the coloring agent composition according to claim 6 ,
further comprising a second step of pulverizing the mixed powder.

9. The process for producing the coloring agent composition according to claim 6 ,
wherein the calcined gypsum has a volume average particle diameter in a range from 20 to 200 μm.

10. A colored gypsum powder composition for forming the gypsum product comprising:
the coloring agent composition according to claim 1 ; and
the gypsum-containing raw material powder.

11. A process for producing a colored gypsum powder composition, comprising:
adding the coloring agent composition according to claim 1 to the gypsum-containing raw material powder.

12. A process for producing a gypsum product, comprising:
adding the coloring agent composition according to claim 1 to the gypsum-containing raw material powder so as to form a colored gypsum power composition;
forming a slurry of the colored gypsum power composition; and
forming the gypsum product from the slurry.

Assignees

• Yoshino Gypsum Co

Inventors

• Sugano Kenichi
• YOSHIKANE Masato
• MAMADA Emi

Classifications

• A61C13/34 Primary

  Making or working of models, e.g. preliminary castings, trial dentures; Dowel pins [4] · CPC title

• C04B40/0042 Primary

  Powdery mixtures · CPC title

• C04B18/146

  Silica fume · CPC title

• C04B2111/82

  Coloured materials · CPC title

• Y02W30/94

  Cross-Sectional Technologies · mapped topic