公开(公告)号：US4681831A

公开(公告)日：1987-07-21

申请号：US880155

申请日：1986-06-30

申请人： James R. Larson ,  Torence J. Trout

发明人： James R. Larson ,  Torence J. Trout

IPC分类号： C08L101/00 ,  G03G9/13 ,  G03G9/12

CPC分类号： G03G9/131

摘要： A liquid electrostatic developer containing negatively chargeable resin particles with improved charging characteristics, said developer consisting essentially of(A) nonpolar liquid having a Kauri-butanol value of less than 30, present in a major amount,(B) nonpolar liquid soluble ionic or zwitterionic charge director compound, and(C) resin particles of a polymer containing at least one acidic constituent having a pKa less than 4.5, preferably 3.0, at 25.degree. C. in water and an acid number due to said acidic constituent of at least one. The average resin particle size by area is less than 10 .mu.m. Optionally a colorant and other additives or adjuvants are present. The liquid electrostatic developer is useful in copying making proofs including digital color proofs, lithographic printing plates, and resists.

摘要翻译： 含有具有改进的充电特性的带负电荷的树脂颗粒的液体静电显影剂，所述显影剂基本上由（A）贝壳杉脂丁醇值小于30的非极性液体以主要量存在，（B）非极性液体可溶性离子或两性离子 电荷导向剂化合物，和（C）含有至少一种酸性组分的聚合物的树脂颗粒，其中所述酸性组分在25℃下在水中的pKa小于4.5，优选为3.0，并且由于所述酸性成分至少为1的酸值。 平均树脂粒径按面积计小于10微米。 任选地，存在着色剂和其它添加剂或助剂。 液体静电显影剂可用于复印制作证明，包括数字彩色印版，平版印刷版和抗蚀剂。