申请人:SAKATA INX CORPORATION
公开号:EP0781820A2
公开(公告)日:1997-07-02
A pigment dispersion is disclosed which comprises a pigment, a pigment dispersant, and optionally a binder resin, wherein the pigment dispersion comprises as the pigment dispersion at least 0.2 parts by weight of a modified novolak resin (A) and/or a graft copolymer (B) relative to 100 parts by weight of the pigment, the modified novolak resin (A) and the graft copolymer (B) each having an aromatic ring and a ring structure given by ring opening of an epoxy group by a carboxyl group of a hydroxycarboxylic acid or a derivative thereof. An ink composition for offset printing containing the pigment dispersion is also disclosed.
本发明公开了一种颜料分散体,它由颜料、颜料分散剂和可选的粘结剂树脂组成,其中颜料分散体包括相对于 100 份颜料重量至少 0.2 重量份的改性酚醛树脂 (A) 和/或接枝共聚物 (B)(相对于 100 重量份的颜料),改性酚醛树脂 (A) 和接枝共聚物 (B) 各具有一个芳香环和一个环状结构,环氧基由羟基羧酸或其衍生物的羧基开环而成。此外,还公开了一种含有该颜料分散体的胶版印刷油墨组合物。