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US 5,718,746 AGranted
Process of producing aqueous pigment ink
AssigneeOrient Chemical Industries, Ltd.
InventorsToshiyuki Nagasawa, Tetsuji Kihara, Sohko Itoh
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Abstract
The present invention provides a process for producing aqueous pigment ink which forms a black matrix having high optical density, excellent flatness of a film and low conductivity, and imparts high resolution power to a color filter. The process comprises the steps of: finely dispersing a carbon black having an oil absorptivity of not more than 100 ml/100 g in an aqueous medium; and oxidizing the carbon black by using a hypohalite.
Claims11
A process for producing aqueous pigment ink, comprising the steps of:
- finely dispersing a carbon black having an oil absorptivity of not more than 100 ml/100 g in an aqueous medium;
- and
- oxidizing the carbon black by using hypohalite.
Dependencies are inferred from the claim text.