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Title:
PRODUCTION OF CONDENSED DISAZO PIGMENT, INK JET RECORDING LIQUID USING PIGMENT PRODUCED THEREBY, AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JPH11279428
Kind Code:
A
Abstract:

To provide a method for producing a condensed disazo pigment excellent in light resistance and dispersibility, and capable of providing an ink jet-recording liquid capable of providing a printed product excellent in water resistance, the light resistance and transparency by kneading a specific compound, a water-soluble inorganic salt and a water-soluble solvent, and forming the kneaded material into a minute product.

(A) A compound of the formula (R is methyl or chlorine; A is methyl or H; B is trifluoromethyl or chlorine; D is H, methyl or p-chlorophenoxy) is kneaded with (B) a water-soluble inorganic salt (e.g. sodium chloride) and (C) a water-soluble solvent (e.g. diethylene glycol), and the kneaded product is formed into a minute product to provide the objective pigment, preferably having 60-200 m2/g specific surface area, 5-150 nm average primary particle diameter and an average ratio of the length to the width regulated so as to be (1:1)-(5:1) in the method for producing the condensed disazo pigment. The amount of the used component B is preferably 2-20 times, more preferably 3-10 times as much as the amount of the component C expressed in terms of weight. The amount of the used component C is 0.5-10 times as much as that of the component A.


Inventors:
UENO YOSHICHIKA
TOYODA ICHIRO
Application Number:
JP6488898A
Publication Date:
October 12, 1999
Filing Date:
March 16, 1998
Export Citation:
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Assignee:
TOYO INK MFG CO
International Classes:
C09B67/20; B41M5/00; C09B67/00; C09D11/00; C09D11/322; C09D11/326; C09D11/38; (IPC1-7): C09B67/20; B41M5/00; C09D11/00