发明授权
- 专利标题: Toner aggregation and coalescence processes
- 专利标题(中): 调色剂聚集和聚结过程
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申请号: US83157申请日: 1993-06-25
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公开(公告)号: US5403693A公开(公告)日: 1995-04-04
- 发明人: Raj D. Patel , Grazyna E. Kmiecik-Lawrynowicz , Michael A. Hopper
- 申请人: Raj D. Patel , Grazyna E. Kmiecik-Lawrynowicz , Michael A. Hopper
- 申请人地址: CT Stamford
- 专利权人: Xerox Corporation
- 当前专利权人: Xerox Corporation
- 当前专利权人地址: CT Stamford
- 主分类号: G03G9/087
- IPC分类号: G03G9/087 ; G03G9/08 ; G03G9/09 ; G03G9/097
摘要:
A process for the preparation of toner compositions with controlled particle size comprising:(i) preparing a pigment dispersion in water, which dispersion is comprised of a pigment, an ionic surfactant in amounts of from about 0.5 to about 10 percent by weight of water, and an optional charge control agent;(ii) shearing the pigment dispersion with a latex mixture comprised of a counterionic surfactant with a charge polarity of opposite sign to that of said ionic surfactant, a nonionic surfactant, and resin particles, thereby causing a flocculation or heterocoagulation of the formed particles of pigment, resin, and charge control agent;(iii) stirring the resulting sheared viscous mixture of (ii) at from about 300 to about 1,000 revolutions per minute to form electrostatically bound substantially stable toner size aggregates with a narrow particle size distribution;(iv) reducing the stirring speed in (iii) to from about 100 to about 600 revolutions per minute, and subsequently adding further anionic or nonionic surfactant in the range of from about 0.1 to about 10 percent by weight of water to control, prevent, or minimize further growth or enlargement of the particles in the coalescence step (iii); and(v) heating and coalescing from about 5 to about 50.degree. C. above about the resin glass transition temperature, Tg, which resin Tg is from between about 45.degree. C. to about 90.degree. C. and preferably from between about 50.degree. C. and about 80.degree. C. the statically bound aggregated particles to form said toner composition comprised of resin, pigment and optional charge control agent.
公开/授权文献
- USD423057S Ring toss game 公开/授权日:2000-04-18
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