Toyo Ink Mfg. Co., Ltd.

Toyo Ink Manufacturing Company

Toshio Oshiba

Osamu Shiromaru

Takuya Kotani

Yusaku Ide

Yuusaku Ide

Yoshinori Kawashima

Takayoshi Ishigami

A process for the production of a &#x3b2; type copper phthalocyanine pigment, comprising dry-milling a crude copper phthalocyanine having a purity of 97 to 100% and a primary crystal diameter of 0.5 to 100 &#x3bc;m at a temperature of 180 to 50&#xb0; C., to prepare an &#x3b1;/&#x3b2; mixed crystal type copper phthalocyanine having an &#x3b1; ratio of 5 to 35%, and treating the dry-milled product with a water-miscible organic solvent, MePc&#x2014;(SONRRRR).&#x2003;&#x2003;(3)

Process for the production of &#x3b2; type copper phthalocyanine pigment and a use thereof

A process for the production of a &#x3b2; type copper phthalocyanine pigment having an average primary crystal diameter of 80&#xb1;40 nm and a primary crystal aspect ratio of 2.0&#xb1;1.0 and having a crystallite diameter of 22&#xb1;5 nm in the direction perpendicular to a monoclinic &#x3b2; (200) plane, a crystallite diameter of 27&#xb1;5 nm in the direction perpendicular to a &#x3b2; (001) plane and a crystallite diameter of 15&#xb1;5 nm in the direction perpendicular to a &#x3b2; (010) plane, which process comprises, dry-milling a crude copper phthalocyanine having a purity of 97 to 100% and a primary crystal diameter of 0.5 to 100 &#x3bc;m at 180 to 50&#xb0; C., to prepare an &#x3b1;/&#x3b2; mixed crystal type copper phthalocyanine having an a ratio of 5 to 35%, and treating the dry-milled product in a water-miscible organic solvent.

Process for the production of &#x3b2; type copper phthalocyanine pigment

Pigment yellow 74 and printing ink composition

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Tokyo, Japan

Toshio Oshiba