Pigment composition and aqueous pigment dispersion prepared therefrom
First Claim
1. A pigment composition in a powder form produced by dry-milling a pigment in the presence of a surfactant and a water-soluble resin, said surfactant and said water-soluble resin being contained in amounts of 1 to 20% by weight and 2 to 50% by weight respectively based on an amount of the pigment,wherein the surfactant has a property of improving the affinity of the pigment and the water-soluble resin,wherein the water-soluble resin has a property of coating and adhering to the surface of the pigment, andwherein the pigment has a property of being dry-millable.
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Abstract
The present invention provide a pigment composition and a method for producing same at low cost, which has the same or more excellent quality compared with those produced by a salt milling process which has been commonly used. The pigment composition is produced by dry-milling a pigment in the presence of a surfactant and a water-soluble resin, said surfactant and said water-soluble resin being contained in amounts of 1 to 20% by weight and 2 to 50% by weight respectively based on an amount of the pigment. The pigment composition according to the present invention is readily dispersed into an aqueous system to obtain an aqueous pigment dispersion.
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Citations
26 Claims
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1. A pigment composition in a powder form produced by dry-milling a pigment in the presence of a surfactant and a water-soluble resin, said surfactant and said water-soluble resin being contained in amounts of 1 to 20% by weight and 2 to 50% by weight respectively based on an amount of the pigment,
wherein the surfactant has a property of improving the affinity of the pigment and the water-soluble resin, wherein the water-soluble resin has a property of coating and adhering to the surface of the pigment, and wherein the pigment has a property of being dry-millable.
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13. A method for producing a pigment composition in a powder form, said method comprising the steps of:
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(a) dry-milling a pigment in the presence of a surfactant and a water-soluble resin to obtain a milled substance, the surfactant and the water-soluble resin being contained in amounts of 1 to 20% by weight and 2 to 50% by weight respectively based on an amount of said pigment, wherein the surfactant has a property ot improving the affinity of the pigment and the water-soluble resin, wherein the water-soluble resin has a property of coating and adhering to the surface of the pigment, and wherein the pigment has a property of being dry-millable; and (b) carrying, out the dry-milling in the presence of heat, and/or heating the milled substance after the dry-milling. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification