| 摘要 |
PCT No. PCT/JP97/00275 Sec. 371 Date Oct. 6, 1997 Sec. 102(e) Date Oct. 6, 1997 PCT Filed Feb. 5, 1997 PCT Pub. No. WO97/28224 PCT Pub. Date Jul. 8, 1997High quality beta -form copper phthalocyanine pigment printing ink is produced by the present method, this method reducing the large amount of time and labor required in the process of pigmentation of crude copper phthalocyanine and production of the pigment printing ink. To this end, the production method of printing ink according to the present invention is characterized by adding to crude copper phthalocyanine, 20-80 weight % of printing ink resin based on the amount of the crude copper phthalocyanine, dry-milling the mixture at 80-170 DEG C., and heating the ground material in printing ink solvent. The printing ink obtained contains copper phthalocyanine particles of beta -form crystals with an aspect ratio of 1-2.
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