| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve, in the method of directly manufacturing printing ink by a method of solvent treatment of a dry-pulverized, ground material of a crude copper phthalocyanine or by treating with a varnish for printing ink or a solvent for printing ink, the following problems that are unsolved or left unsolved while the method of carrying out dry pulverization together with a resin is a very effective means in the above method: the problem wherein the primary particles of the pigment take needle-like shapes; the problem of a reddish hue; and the problem of fluidity/ink stiffening. <P>SOLUTION: The printing ink for offset is produced by adding a pigment derivative of a specific structural formula to a pigment composition produced by a manufacturing method of dry-pulverizing the crude copper phthalocyanine. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
