SPHERICAL GRANULE OF WATER-SOLUBLE AZO COMPOUND AND METHOD FOR PRODUCING THE SAME

Japanese Patent JP3510663

B2

PURPOSE: To provide a method for producing the spherical granules of a water-soluble azo compound, capable of safely obtaining the spherical water-soluble azo compound substantially not generating dust.
CONSTITUTION: A method for producing the spherical granules of a water-soluble azo compound comprises dispersing a water-soluble azo compound in 1-100 times weight, preferably 1.5-20 times weight of a water-insoluble solvent, dropping a hydrophilic solvent capable of dissolving the water-soluble azo compound in an amount capable of partially dissolving the water-soluble azo compound (preferably in an amount of 3-20wt.% based on the water-soluble azo compound) for granulating the dispersed water-soluble azo compound in the solution, filtering the obtained spherical granule suspension for separating only the spherical granules, and subsequently drying the separated granules. The method can especially be applied to an azo compound of formula I [R1, R2 are alkyl, cycloalkyl; Z is a group of formula II or III (R3 is H, alkyl, allyl, phenyl which can be substituted; R4 is R3 excluding allyl; R5 is alkylene which can be substituted; R6 is H, hydroxyalkyl; X is Cl, Br, CH3COO)] or a group of formula IV [A is alkylene which can be substituted; R7 is alkyl; Y is alkali metal, alkaline earth metal (2Y), NH4].

Amou, Hideo
Kagomoto, Seiya
Goto, Akihiko

JP4770994A

March 29, 2004

February 21, 1994

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OTSUKA CHEM CO LTD

B01J2/00; C07C245/02; C07C255/65; C07C257/14; C07C257/16; C07D229/00; C09B67/00; C07D247/00; (IPC1-7): C07C245/02; C07C255/65; C07C257/14; C07C257/16; C07D229/00; C07D247/00

田村 巌

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