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1. 发明授权

US4840865A Liquid developer for electrostatic photography 失效
标题翻译：静电摄影用液体显影剂
公开(公告)号：US4840865A
公开(公告)日：1989-06-20
申请号：US946728
申请日：1986-12-29
申请人： Eiichi Kato , Shigeyuki Dan , Hiroshi Ishibashi , Kazuo Ishii , Hidefuji Sera
发明人： Eiichi Kato , Shigeyuki Dan , Hiroshi Ishibashi , Kazuo Ishii , Hidefuji Sera
IPC分类号： G03G9/12 , G03G9/13
CPC分类号： G03G9/13
摘要： A liquid developer for electrostatic photography is disclosed, comprising a non-aqueous solvent having electrical resistivity of not less than 10.sup.9 .OMEGA..cm and a dielectric constant of not more than 3.5 having dispersed therein at least a resin, wherein said resin is a copolymer resin obtained by subjecting a solution containing (A) at least one of monofunctional monomer which is soluble in said solvent but insolubilized upon polymerization and (B) at least one of monomers having at least two polar groups and/or polar linking groups represented by formula (I): ##STR1## wherein V, Y, R.sub.1, R.sub.2, X.sub.1, X.sub.2, a.sub.1, and a.sub.2 are defined in the specification, to a polymerization reaction in the presence of a resin which is soluble in said solvent and contains no graft group polymerizable with said monomers. The developer is excellent in dispersion stability, redispersibility and fixing properties and is capable of producing a master plate for offset printing having excellent ink sensitivity and printing durability.
摘要翻译：公开了一种用于静电摄影的液体显影剂，其包含电阻率不小于10 9欧姆·厘米，介电常数不大于3.5的非水溶剂，其中至少分散有树脂，其中所述树脂是共聚物树脂通过使含有（A）至少一种可溶于所述溶剂但不溶于聚合的单官能单体的溶液和（B）至少一种具有至少两个极性基团和/或由式（ I）：其中V，Y，R1，R2，X1，X2，a1和a2在本说明书中定义为在可溶于所述溶剂中的树脂存在下的聚合反应，并含有没有与所述单体可聚合的接枝基团。显影剂的分散稳定性，再分散性和定影性优异，能够制造具有优异的油墨敏感性和印刷耐久性的胶印用母板。

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