METHOD FOR MANUFACTURING CUTTLEFISH INK PIGMENT PARTICLE, AND ORGANIC PIGMENT OR DYE, AND TONER FOR COPYING MACHINE, AQUEOUS INK, OILY INK OR HAIR DYE USING THE SAME

摘要

PPROBLEM TO BE SOLVED: To provide fine cuttlefish ink pigment particles containing a black or dark brown melanin pigment, which are useful for a toner for a copying machine, an aqueous ink, an oily ink or a hair dye source material. PSOLUTION: The method for manufacturing cuttlefish ink pigment particles is characterized in that: after an ink sac of cuttlefish is dried, pulverized and cleaned, cuttlefish ink is subjected to a first enzymatic reaction by using a protease under the conditions of the enzyme concentration in a range from 0.1 to 1% with respect to the dry weight of the cuttlefish ink and of a pH range from 7 to 10, the ink is purified with an ultrafiltration membrane of 1,000 kDa to remove impurities; the purified cuttlefish ink is subjected to a second enzymatic reaction under concentration and pH conditions increased than in the first enzymatic reaction, in a range from 5 to 20% with respect to the dry weight of the ink and in a pH range from 9 to 11, and the ink is filtered through an ultrafiltration membrane of 1,000 kDa to produce monodisperse particles having a normal distribution having the center in a range of 145 to 486 nm. PCOPYRIGHT: (C)2009,JPO&INPIT