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1. 发明授权

US06531256B1 Process for making particulate compositions 有权
标题翻译：制备颗粒组合物的方法
公开(公告)号：US06531256B1
公开(公告)日：2003-03-11
申请号：US09423052
申请日：2000-01-10
申请人： Alison Dawn Bedells , Daniel Patrick Morris , Kumar Abhinava , Martin Russell Edwards , William Malcolm Logan Wood
发明人： Alison Dawn Bedells , Daniel Patrick Morris , Kumar Abhinava , Martin Russell Edwards , William Malcolm Logan Wood
IPC分类号： C08J3215
CPC分类号： C08J3/215 , G03G9/0804 , G03G9/0806
摘要： There is described a process for producing a particulate composition comprising the steps of: (a) forming a first dispersion comprising first particles stabilised in a first fluid by a first species in an initial state, the first species changeable between the initial state and a further state, where the initial state provides (directly or indirectly) more stability to the particles within the dispersion than the further state; (b) optionally the step of forming a second dispersion comprising second particles stabilised in a second fluid, miscible with the first fluid, by a second species in the, or another, initial state, the second species also changeable between the, or another ,initial state and the, or another, further state, where said initial state provides (directly or indirectly) more stability to the particles within the dispersion than said further state; (c) after the optional step of mixing the first and second dispersions together if the second dispersion was formed in step b), changing the state(s) of the first and/or optionally second species from the initial state(s) to the further state(s) substantially to induce association between the dispersed particles to form clusters; and (d) binding together the particles within the clusters. A preferred embodiment of the process comprises mixing together two aqueous dispersions of particles (e.g. pigment particles with particles of latex polymer formed by emulsion polymerisation). The dispersions are stabilised by ionic surfactants of same sign charge. Association of the particles into clusters is induced by adjusting pH to selectively protonate or deprotonate the surfactants. The clusters are grown by aggregation into loose matrices which are fused together to form particles which can be used in electroreprographic toners.
摘要翻译：描述了一种制备颗粒组合物的方法，其包括以下步骤：（a）在初始状态下，由第一种类形成第一分散体，该第一分散体包含在第一流体中被稳定在第一流体中的第一颗粒，第一种可在初始状态和另一种之间变化状态，其中所述初始状态提供（直接或间接）对所述分散体内的颗粒比所述另外的状态更多的稳定性;（b）任选地形成包含稳定在第二流体中的第二分散体的第二分散体的步骤，所述第二分散体可与所述第一流体混溶在第一种状态下，第二种在初始状态或另一种初始状态之间也可以变化，或者在另一状态下，或另一种进一步的状态，其中所述初始状态（直接地或间接地）提供在所述分散体内的颗粒比所述另外的状态;（c）如果第二分散体在步骤中形成的任选步骤将第一和第二分散体混合在一起 b），将第一种和/或任选的第二种类的状态从初始状态改变到另一种状态，以基本上引起分散的颗粒之间的缔合以形成簇; 该方法的优选实施方案包括将两种颗粒水分散体（例如颜料颗粒与通过乳液聚合形成的胶乳聚合物颗粒）混合在一起。分散体由相同符号电荷的离子表面活性剂稳定。通过调节pH来选择性地使表面活性剂质子化或去质子化，从而诱导颗粒与簇的结合。这些簇通过聚集生长成松散的基质，其被熔合在一起以形成可用于电解调色剂中的颗粒。

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