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    SPHERICAL PARTICLES COMPRISING CARBON NANOMATERIAL-GRAFT-POLYURETHANE AND METHODS OF PRODUCTION AND USES THEREOF
    22.
    发明申请
    SPHERICAL PARTICLES COMPRISING CARBON NANOMATERIAL-GRAFT-POLYURETHANE AND METHODS OF PRODUCTION AND USES THEREOF 有权

    公开(公告)号：US20220363800A1

    公开(公告)日：2022-11-17

    申请号：US17321877

    申请日：2021-05-17

    Applicant: Xerox Corporation

    Inventor： Robert Claridge ,  Valerie M. Farrugia ,  Shivanthi Easwari Sriskandha

    IPC: C08F292/00 ,  C08L75/08

    Abstract: A nonlimiting example method of forming highly spherical carbon nanomaterial-graft-polyurethane (CNM-g-polyurethane) particles may comprising: mixing a mixture comprising: (a) carbon nanomaterial-graft-polyurethane (CNM-g-polyurethane), wherein the CNM-g-polyurethane particles comprises: a polyurethane grafted to a carbon nanomaterial, (b) a carrier fluid that is immiscible with the polyurethane of the CNM-g-polyurethane, optionally (c) a thermoplastic polymer not grafted to a CNM, and optionally (d) an emulsion stabilizer at a temperature greater than a melting point or softening temperature of the polyurethane of the CNM-g-polyurethane and the thermoplastic polymer, when included, and at a shear rate sufficiently high to disperse the CNM-g-polyurethane in the carrier fluid; cooling the mixture to below the melting point or softening temperature to form CNM-g-polyurethane particles; and separating the CNM-g-polyurethane particles from the carrier fluid.

    THERMOPLASTIC PARTICULATES COMPRISING A CARBOXYLIC ACID-BASED SINTERING AID AND ADDITIVE MANUFACTURING THEREWITH
    23.
    发明申请
    THERMOPLASTIC PARTICULATES COMPRISING A CARBOXYLIC ACID-BASED SINTERING AID AND ADDITIVE MANUFACTURING THEREWITH 有权

    公开(公告)号：US20220118693A1

    公开(公告)日：2022-04-21

    申请号：US17071255

    申请日：2020-10-15

    Applicant: Xerox Corporation

    Inventor： Robert Claridge ,  Cristina Resetco ,  Richard Philip Nelson Veregin

    IPC: B29C64/153 ,  B33Y10/00 ,  B33Y80/00 ,  B29B9/12 ,  B29C64/314

    Abstract: Additive manufacturing processes featuring consolidation of thermoplastic particulates may form printed objects in a range of shapes. Nanoparticles disposed upon the outer surface of the thermoplastic particulates may improve flow performance of the thermoplastic particulates during additive manufacturing, but may lead to excessive porosity following consolidation. Excessive porosity may be detrimental for performance applications requiring high mechanical strength. A carboxylic acid-based sintering aid, particularly a metal carboxylate, may decrease porosity of consolidated parts following sintering without substantially increasing blocking in a powder bed. Particulate compositions suitable for additive manufacturing may comprise: a plurality of thermoplastic particulates comprising a carboxylic acid-based sintering aid admixed with a thermoplastic polymer, and a plurality of nanoparticles disposed upon an outer surface of the thermoplastic particulates.

    Thermoplastic Polymer Particles and Methods of Production and Uses Thereof
    25.
    发明申请
    Thermoplastic Polymer Particles and Methods of Production and Uses Thereof 有权

    公开(公告)号：US20210070993A1

    公开(公告)日：2021-03-11

    申请号：US16946622

    申请日：2020-06-30

    Applicant: Xerox Corporation

    Inventor： Valerie M. Farrugia ,  Cristina Resetco ,  Michael S. Hawkins ,  Shivanthi Easwari Sriskandha ,  Robert Claridge ,  Carolyn Patricia Moorlag

    IPC: C08L77/06 ,  C08L83/04 ,  C08L75/08 ,  C08L67/03 ,  C08L23/12

    Abstract: Thermoplastic polymer particles can be produced that comprise a thermoplastic polymer and an emulsion stabilizer (e.g., nanoparticles and/or surfactant) associated with an outer surface of the particles. The nanoparticles may be embedded in the outer surface of the particles. Melt emulsification can be used to produce said particles. For example, a method may include: mixing a mixture comprising a thermoplastic polymer, an carrier fluid that is immiscible with the thermoplastic polymer, and the emulsion stabilizer at a temperature greater than a melting point or softening temperature of the thermoplastic polymer and at a shear rate sufficiently high to disperse the thermoplastic polymer in the carrier fluid; cooling the mixture to below the melting point or softening temperature of the thermoplastic polymer to form the thermoplastic polymer particles; and separating the thermoplastic polymer particles from the carrier fluid.

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