Pigment composition and aqueous pigment dispersion product using the same

• US 6,379,451 B1
• Filed: 04/04/2000
• Issued: 04/30/2002
• Est. Priority Date: 04/05/1999
• Status: Expired due to Fees

• Current Assignee: TOYO Ink Manufacturing Company Limited
• Original Assignee: TOYO Ink Manufacturing Company Limited
• Inventors: Kitamura, Kenji, Chiba, Ataru
• Primary Examiner(s): GREEN, ANTHONY J
• Application Number:
  US09/542,906
• Time in Patent Office: 756 Days
• Field of Search: 106/412, 106/413, 106/493, 106/494, 106/495, 106/496, 106/497, 106/498, 106/499
• US Class Current: 106/413
• CPC Class Codes: C09B 67/006 Preparation of organic pigments
• CPC Class Codes: C09B 67/0085 Non common dispersing agents

Abstract

There are disclosed a pigment composition comprising a dry-milled pigment, a water-soluble resin, and a nonionic surfactant composed of a compound having an acetylenic linkage; and a method for producing a pigment composition, comprising dry-milling a pigment containing coarse particles in the presence of a water-soluble resin and a nonionic surfactant composed of a compound having an acetylenic linkage. The production method is also possible in the form of comprising (a) dry-milling a pigment containing coarse particles in the presence of a nonionic surfactant composed of a compound having an acetylenic linkage thereby obtaining an intermediate milled product, and (b) further dry-milling a mixture of the intermediate milled product and a water-soluble resin. For producing an aqueous pigment dispersion product, there is also disclosed herein a method comprising the steps of (a) dry-milling a pigment containing coarse particles in the presence of a water-soluble resin thereby obtaining a milled product, and (b) dispersing the milled product in water in the presence of a nonionic surfactant composed of a compound having an acetylenic linkage.

Claims

1. A pigment composition comprising a dry-milled pigment, a water-soluble resin, and a nonionic surfactant composed of a compound having an acetylenic linkage, wherein the water-soluble resin is an acrylic resin, the dry-milled pigment is composed of a condensed polycyclic compound, and the nonionic surfactant is an acetylene glycol compound, and further wherein the water-soluble resin is in an amount of 2 to 50% by weight and the nonionic surfactant is in an amount of 1 to 20% by weight based on an amount of the dry-milled pigment.

2. The pigment composition according to claim 1, wherein the water-soluble resin is water-soluble in the presence of an alkali.

3. The pigment composition according to claim 1, wherein the dry-milled pigment is phthalocyanine pigment.

4. The pigment composition according to claim 1, wherein the acetylene glycol compound is 2,4,7,9-tetramethyl-5-decyne-4,7-diol or an ethylene oxide adduct thereof.

5. The pigment composition according to claim 1, wherein the dry-milled pigment is composed of pigment particles having surfaces coated with the water-soluble resin.

6. An aqueous pigment dispersion product wherein the pigment composition according to claim 1 is dispersed in water.

7. A method for producing a pigment composition, comprising dry-milling a pigment containing coarse particles in the presence of a water-soluble resin and a nonionic surfactant composed of a compound having an acetylenic linkage, wherein the water-soluble resin is an acrylic resin, the pigment is composed of a condensed polycyclic compound, and the nonionic surfactant is an acetylene glycol compound, and further wherein the water-soluble resin is in an amount of 2 to 50% by weight and the nonionic surfactant is in an amount of 1 to 20% by weight based on an amount of the pigment.

8. The method according to claim 7, wherein the pigment is a crude pigment.

9. A method for producing a pigment composition, said method comprising the steps of:

(a) dry-milling a pigment containing coarse particles in the presence of a nonionic surfactant composed of a compound having an acetylenic linkage thereby obtaining an intermediate milled product, and

(b) further dry-milling a mixture of the intermediate milled product and a water-soluble resin,

wherein the water-soluble resin is an acrylic resin, the pigment is composed of a condensed polycyclic compound, and the nonionic surfactant is an acetylene glycol compound, and further wherein the water-soluble resin is in an amount of 2 to 50% by weight and the nonionic surfactant is in an amount of 1 to 20% by weight based on an amount of the pigment.

10. The method according to claim 9, wherein the pigment is a crude pigment.

11. A method for producing an aqueous pigment dispersion product, said method comprising the steps of:

(a) dry-milling a pigment containing coarse particles in the presence of a water-soluble resin thereby obtaining a milled product, and

(b) dispersing the milled product in water in the presence of a nonionic surfactant composed of a compound having an acetylenic linkage,

wherein the water-soluble resin is an acrylic resin, the pigment is composed of a condensed polycyclic compound, and the nonionic surfactant is an acetylene glycol compound, and further wherein the water-soluble resin is in an amount of 2 to 50% by weight and the nonionic surfactant is in an amount of 1 to 20% by weight based on an amount of the pigment.

12. The method according to claim 11, wherein the pigment is a crude pigment.

13. The method according to claim 11, wherein the water-soluble resin is water-soluble in the presence of an alkali.

14. The method according to claim 11 wherein the acetylene glycol compound is 2,4,7,9-tetramethyl-5-decyne-4,7-diol or an ethylene oxide adduct thereof.