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    2.
    发明专利
    未知

    公开(公告)号：DE602006003362D1

    公开(公告)日：2008-12-11

    申请号：DE602006003362

    申请日：2006-03-24

    Applicant: XEROX CORP

    Inventor： FARRUGIA VALERIE M ,  CHEN ALLAN K ,  NOSELLA KIMBERLY D ,  PATEL RAJ D ,  NG T HWEE

    IPC: G03G9/08 ,  G03G9/087

    Abstract: A method of making particles suitable for use as toners includes forming a mixture of sulfonated polyester resin, a colorant dispersion and optionally a wax dispersion, homogenizing the mixture, adding a coagulant to the mixture to aggregate the mixture to form aggregated particles, and coalescing the aggregated particles to form coalesced particles. In the method, when a predetermined average particle size is achieved during the aggregation and/or coalescing step, a complexing agent that complexes with ions of the coagulant is added in an amount effective to substantially halt any further particle growth. The complexing agent is believed to halt further growth by complexing with free coagulant ions still in the solution.

    PROCESS FOR PREPARING COPOLYMERS
    6.
    发明专利
    PROCESS FOR PREPARING COPOLYMERS 未知

    公开(公告)号：CA2063473C

    公开(公告)日：1998-09-22

    申请号：CA2063473

    申请日：1992-03-19

    Applicant: XEROX CORP

    Inventor： KOVACS GREGORY J ,  TAM MAN C ,  NG T HWEE ,  MAHABADI HADI K ,  PETERS ERIC M ,  LOUTFY RAFIK O

    IPC: C08F2/00 ,  C08F2/06 ,  C08F2/18 ,  C08F4/38 ,  G03G17/10

    Abstract: Disclosed is a process for preparing copolymers which comprises, in the order stated: (1) adding monomers containing unsaturated carbon-to-carbon bonds, a first polymerization initiator, a second polymerizatio n initiator, and a solvent to a reaction vessel; (2) purging the resulting solution with an inert gas; (3) sealing the reaction vessel and pressurizing it by addition of an inert gas to a pressure of from about 20 to about 600 kilopascals over ambient atmospheric pressure; (4) maintaining the temperature within the pressurized reaction vessel at a temperature of from about 50 to about 100.degree.C for a period of from about 60 to about 300 minutes; (5) thereafter maintaining the temperature within the pressurized reaction vessel at a temperature of from about 80 to about 115.degree.C for a period of from about 30 to about 300 minutes, wherein the temperature in step (5) is higher than the temperature in step (4); and (6) subsequently maintaining the temperature within the pressurized reaction vessel at a temperature of from about 115 to about 160.degree.C for a period of from about 30 to about 180 minutes, wherein the temperature in step (6) is higher than the temperature in step (5). Polymers prepared according to the process of the present invention can be particularly useful in migration imaging members.

    CONTROL OF PARTICLE GROWTH WITH COMPLEXING AGENTS
    8.
    发明专利
    CONTROL OF PARTICLE GROWTH WITH COMPLEXING AGENTS 未知

    公开(公告)号：CA2541055C

    公开(公告)日：2009-12-22

    申请号：CA2541055

    申请日：2006-03-24

    Applicant: XEROX CORP

    Inventor： NOSELLA KIMBERLY D ,  PATEL RAJ D ,  FARRUGIA VALERIE M ,  CHEN ALLAN K ,  NG T HWEE

    IPC: G03G9/08

    Abstract: A method of making particles suitable for use as toners includes forming a mixture of sulfonated polyester resin, a colorant dispersion and optionally a wax dispersion, homogenizing the mixture, adding a coagulant to the mixture to aggregate the mixture to form aggregated particles, and coalescing the aggregated particles to form coalesced particles. In the method, when a predetermined average particle size is achieved during th e aggregation and/or coalescing step, a complexing agent that complexes with ions of the coagulant is added in an amount effective to substantially halt any further particle growth. Th e complexing agent is believed to halt further growth by complexing with free coagulant ions still in the solution.

    CONTROL OF PARTICLE GROWTH WITH COMPLEXING AGENTS
    9.
    发明专利
    CONTROL OF PARTICLE GROWTH WITH COMPLEXING AGENTS 未知

    公开(公告)号：CA2541055A1

    公开(公告)日：2006-09-30

    申请号：CA2541055

    申请日：2006-03-24

    Applicant: XEROX CORP

    Inventor： PATEL RAJ D ,  NG T HWEE ,  CHEN ALLAN K ,  NOSELLA KIMBERLY D ,  FARRUGIA VALERIE M

    IPC: G03G9/08

    Abstract: A method of making particles suitable for use as toners includes forming a mixture of sulfonated polyester resin, a colorant dispersion and optionally a wax dispersion, homogenizing the mixture, adding a coagulant to the mixture to aggregate the mixture to form aggregated particles, and coalescing the aggregated particles to form coalesced particles. In the method, when a predetermined average particle size is achieved during th e aggregation and/or coalescing step, a complexing agent that complexes with ions of the coagulant is added in an amount effective to substantially halt any further particle growth. Th e complexing agent is believed to halt further growth by complexing with free coagulant ions still in the solution.

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