发明授权
- 专利标题: Toner aggregation process
- 专利标题(中): 调色剂聚合过程
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申请号: US158343申请日: 1993-11-29
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公开(公告)号: US5370964A公开(公告)日: 1994-12-06
- 发明人: Raj D. Patel , Grazyna E. Kmiecik-Lawrynowicz , Michael A. Hopper , Melvin D. Croucher , T. Hwee Ng , William J. Dale
- 申请人: Raj D. Patel , Grazyna E. Kmiecik-Lawrynowicz , Michael A. Hopper , Melvin D. Croucher , T. Hwee Ng , William J. Dale
- 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: G03G9/08
- IPC分类号: G03G9/08
摘要:
A process for the preparation of toner comprising:(i) preparing a pigment dispersion in water, which dispersion is comprised of pigment, an ionic surfactant, and an optional charge control agent;(ii) shearing the pigment dispersion with a polymeric latex comprised of resin, a counterionic surfactant with a charge polarity of opposite sign to that of said ionic surfactant, and which latex contains a nonionic surfactant thereby forming a homogeneous or a uniform blend;(iii) heating the above sheared homogeneous blend below about the glass transition temperature (Tg) of the resin to form electrostatically bound toner size aggregates;(iv) reshearing the above electrostatically bound toner aggregates (iii) to fragment or break down said toner aggregates of (iii) into smaller average diameter particle size;(v) heating the resulting formed sheared homogeneous blend (iv) comprised of resin, pigment particles, and the ionic, counterionic and nonionic surfactants in water below about the glass transition temperature (Tg) of the resin while continuously stirring at about 450 to about 800 revolutions per minute to form electrostatically bound toner size aggregates with a narrow particle size distribution;(vi) adding further ionic or nonionic surfactant in an amount of from about 0.1 to about 10 percent by weight of water to minimize further growth or enlargement of the particles in the coalescence step (vii); and(vii) heating the formed statically bound aggregated particles of (vi) about above the Tg of the resin to provide coalesced particles of toner(viii) separating said toner; and(ix) drying said toner.
公开/授权文献
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