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    • 49. 发明授权
    • Liquid developer compositions with multiple block copolymers
    • 具有多嵌段共聚物的液体显影剂组合物
    • US5525450A
    • 1996-06-11
    • US522908
    • 1995-09-01
    • John W. SpiewakJames R. LarsonScott D. Chamberlain
    • John W. SpiewakJames R. LarsonScott D. Chamberlain
    • G03G9/13G03G9/135
    • G03G9/133
    • A liquid developer comprised of a nonpolar liquid, thermoplastic resin particles, a charge adjuvant, pigment, and a charge director selected from the group consisting of the triblock polymers BAA', BA'A, and ABA' wherein A, A' and B represent polymer segments or blocks, the polar A block repeat units contain an alkylated or protonated ammonium charged site and the polar A' block repeat units contain an acid group of a pKa equal to or less than about 7.0, and wherein the nonpolar B block repeat units contain aliphatic hydrocarbon solubilizing groups; and wherein the A and A' block number average molecular weights range from about 200 to 120,000, and the B block number average molecular weights range from about 2,000 to 190,000; and the total number average molecular weight of said charge director is from about 2,400 to about 300,000, and the ratio of M.sub.w to M.sub.n for said charge director is 1 to 5.
    • 包含非极性液体,热塑性树脂颗粒,电荷佐剂,颜料和电荷引导剂的液体显影剂,其选自三嵌段聚合物BAA',BA'A和ABA',其中A,A'和B表示 聚合物链段或嵌段,极性A嵌段重复单元含有烷基化或质子化的铵充电位点,极性A'嵌段重复单元含有pKa等于或小于约7.0的酸基,其中非极性B嵌段重复单元 含有脂族烃增溶基团; 并且其中A和A'嵌段数均分子量为约200至120,000,B嵌段数均分子量为约2,000至190,000; 并且所述电荷导向剂的总数均分子量为约2,400至约300,000,并且所述电荷导向剂的Mw与Mn的比为1至5。