| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve problems that a method for dry pulverization together with a resin does not solve problems of forming primary particles of a pigment into a needle-like shape and problems of a reddish hue and fluidity/ink stiffening remain unsolved though the method for dry pulverization together with the resin is an extremely effective means in a method for treating a ground material of a dry pulverized crude copper phthalocyanine with a solvent or a method for directly producing a printing ink by carrying out a treatment in a varnish for the printing ink or a solvent for the printing ink. <P>SOLUTION: The printing ink for offset is produced as follows. A phthalocyanine derivative of a specific structural formula is added to a pigment composition produced by the method for production comprising dry pulverizing the crude copper phthalocyanine. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
