Pigment composition production method

Patent metadata

Field	Value
Publication number	US-10538668-B2
Application number	US-201615767929-A
Country	US
Kind code	B2
Filing date	Oct 4, 2016
Priority date	Oct 13, 2015
Publication date	Jan 21, 2020
Grant date	Jan 21, 2020

Abstract

The present invention relates to [1] a process for producing a pigment composition, including the step of subjecting a raw material pigment composition containing C.I. Pigment Yellow 74, a specific by-product and water to heat treatment at a temperature of from 160 to 210° C.; and [2] a method of reducing a content of a by-product in a raw material pigment composition containing C.I. Pigment Yellow 74, the specific by-product and water, said method including the step of subjecting the raw material pigment composition to heat treatment at a temperature of from 160 to 210° C.

First claim

The invention claimed is:

1. A process for producing a pigment composition, comprising the step of subjecting a raw material pigment composition comprising C.I. Pigment Yellow 74, a compound (I) represented by the following formula (I-1) or (I-2) and water to heat treatment at a temperature of not lower than 160° C. and not higher than 210° C.:

2. The process for producing a pigment composition according to claim 1 , wherein a temperature used in the heat treatment is not lower than 165° C. and not higher than 210° C.

3. The process for producing a pigment composition according to claim 1 , wherein the heat treatment is conducted for a time of not less than 1 second and not more than 25 minutes.

4. The process for producing a pigment composition according to claim 1 , wherein the heat treatment is conducted for a time of not less than 5 seconds and not more than 25 minutes.

5. The process for producing a pigment composition according to claim 1 , wherein the time of the heat treatment is controlled such that a value of X represented by the following formula (1) is not less than 3×10 −4 and not more than 1:
X [−]=Decomposition rate constant k [l/s]×time t [s]  (1).

6. The process for producing a pigment composition according to claim 1 , wherein the time of the heat treatment is controlled such that a value of X represented by the following formula (1) is not less than 3×10 −3 and not more than 5×10 −1 :
X [−]=Decomposition rate constant k [l/s]×time t [s]  (1).

7. The process for producing a pigment composition according to claim 1 , wherein a content of the compound (I) in the pigment composition after the heat treatment is reduced to not more than 75% of a content of the compound (I) in the raw material pigment composition before the heat treatment.

8. The process for producing a pigment composition according to claim 1 , wherein a content of the compound (I) in the pigment composition after the heat treatment is reduced to not less than 5% and not more than 70% of a content of the compound (I) in the raw material pigment composition before the heat treatment.

9. The process for producing a pigment composition according to claim 1 , wherein the heat treatment is conducted using a double pipe heat exchanger or a multi-pipe heat exchanger.

10. The process for producing a pigment composition according to claim 1 , wherein the content of the compound (I) in the pigment composition after the heat treatment is not more than 650 mg/kg on the basis of a content of the C.I. Pigment Yellow 74 in the pigment composition after the heat treatment.

11. The process for producing a pigment composition according to claim 1 , wherein the content of the compound (I) in the pigment composition after the heat treatment is not less than 80 mg/kg and not more than 600 mg/kg on the basis of a content of the C.I. Pigment Yellow 74 in the pigment composition after the heat treatment.

12. The process for producing a pigment composition according to claim 1 , wherein a total content of the C.I. Pigment Yellow 74 and the compound (I) in the raw material pigment composition is not less than 0.1% by mass and not more than 30% by mass.

13. The process for producing a pigment composition according to claim 1 , wherein a total content of the C.I. Pigment Yellow 74 and the compound (I) in the raw material pigment composition is not less than 1% by mass and not more than 30% by mass.

14. The process for producing a pigment composition according to claim 1 , wherein the C.I. Pigment Yellow 74 is produced by a method of subjecting a diazotization product of m-nitro-o-anisidine to coupling reaction with acetoacetic-o-anisidide.

15. The process for producing a pigment composition according to claim 1 , wherein the raw material pigment composition is a raw material pigment composition (i) comprising the C.I. Pigment Yellow 74, which is obtained by subjecting a diazotization product of m-nitro-o-anisidine to coupling reaction with acetoacetic-o-anisidide, and water, a raw material pigment composition (ii) obtained by mixing the C.I. Pigment Yellow 74 with water, or a raw material pigment composition (iii) prepared by dispersing the C.I. Pigment Yellow 74 in water using a polymer dispersant.

16. The process for producing a pigment composition according to claim 15 , wherein the polymer dispersant is a synthetic polymer, and the synthetic polymer is in the form of a copolymer containing a constitutional unit derived from a hydrophobic group-containing monomer and a constitutional unit derived from a hydrophilic group-containing monomer.

17. The process for producing a pigment composition according to claim 1 , wherein in the case where the raw material pigment composition is the raw material pigment composition (iii), a content of the polymer dispersant in the raw material pigment composition is not less than 1% by mass and not more than 10% by mass.

18. The process for producing a pigment composition according to claim 1 , wherein a content of water in the raw material pigment composition is not less than 50% by mass and not more than 99% by mass.

19. The process for producing a pigment composition according to claim 1 , wherein a content of water in the raw material pigment composition is not less than 65% by mass and not more than 90% by mass.

20. The process for producing a pigment composition according to claim 1 , wherein the compound represented by the formula (I-1) is a compound represented by the following formula (I-1-1), and the compound represented by the formula (I-2) is a compound represented by the following formula (I-2-1):

21. A method of reducing a content of a compound (I) represented by the following formula (I-1) or (I-2) in a raw material pigment composition comprising C.I. Pigment Yellow 74, the compound (I) represented by the following formula (I-1) or (I-2) and water, said method comprising the step of subjecting the raw material pigment composition to heat treatment at a temperature of not lower than 160° C. and not higher than 210° C.:

Assignees

• Kao Corp

Inventors

• Abe Shuichi
• Oda Tsuyoshi
• Iwasaki Toshiya

Classifications

• C09B67/0091

  Process features in the making of dispersions, e.g. ultrasonics · CPC title

• C09B67/0046

  Mixtures of two or more azo dyes · CPC title

• C09B67/0009 Primary

  containing organic acid derivatives · CPC title

• C09B67/009

  polymeric dispersing agent · CPC title

• C09B67/0066

  Aqueous dispersions of pigments containing only dispersing agents · CPC title