• 专利标题:   Making a coating dispersion, used to make surface layer, comprises e.g. mixing graphene particles, fluorosilane coupling agent and first solvent, concentrating obtained first dispersion, and mixing it with fluoropolymer particle dispersion.
  • 专利号:   US2015093511-A1, JP2015071757-A, US9394421-B2, JP6448272-B2
  • 发明人:   ZHANG Q, QI Y, GARDNER S J, HU N
  • 专利权人:   XEROX CORP, XEROX CORP, XEROX CORP
  • 国际专利分类:   C08K003/04, C08K005/54, C09D127/12, C01B031/02, C09D133/00, C09D133/02, C09D169/00, C09D201/00, C09D007/12, B05D003/02, C08J003/215, C01B032/182, C09D007/61, C09D007/65
  • 专利详细信息:   US2015093511-A1 02 Apr 2015 C09D-127/12 201528 Pages: 8 English
  • 申请详细信息:   US2015093511-A1 US044190 02 Oct 2013
  • 优先权号:   US044190

▎ 摘  要

NOVELTY - Making (M1) coating dispersion, comprises: (a) mixing graphene particles, fluorosilane coupling agent and first solvent to produce first dispersion, where graphene particles are present at 0.1-0.8 wt.% of first dispersion; (b) concentrating first dispersion by removing first solvent to form concentrated dispersion, where graphene particles are present at 2-10 wt.% of the dispersion; (c) mixing concentrated dispersion with fluoropolymer particle dispersion comprising second solvent, surfactant and fluoropolymer particles; and (d) adding polymer binder in third solvent to second dispersion. USE - The method is useful for making a coating dispersion, which is useful: for manufacturing a surface layer (all claimed); and in a release layer of a fuser member. ADVANTAGE - The method provides uniform graphene particle/fluoropolymer particle dispersion, which is electrically conductive, thermally conductive and/or mechanically robust, exhibits improved stability, and provides void free coating. DETAILED DESCRIPTION - Making (M1) a coating dispersion, comprises: (a) mixing graphene particles, a fluorosilane coupling agent and a first solvent to produce a first dispersion, where the graphene particles are present at 0.1-0.8 wt.% of the first dispersion; (b) concentrating the first dispersion by removing the first solvent to produce a concentrated dispersion, where the graphene particles are present at 2-10 wt.% of the concentrated dispersion; (c) mixing the concentrated dispersion with a fluoropolymer particle dispersion comprising a second solvent, a surfactant and fluoropolymer particles, where the fluoropolymer particle dispersion has a solids content of 30-50 wt.% to form a second dispersion; and (d) adding a polymer binder in a third solvent to the second dispersion to form the coating dispersion, where the coating dispersion has a viscosity of 10-200 centipoise. An INDEPENDENT CLAIM is also included for manufacturing (M2) a surface layer, comprising: the step (a) as above per se; concentrating the first dispersion by removing the first solvent and the fluorosilane coupling agent to produce a concentrated dispersion, where the graphene particles are present at 2-10 wt.% of the concentrated dispersion; mixing the concentrated dispersion with a perfluoroalkoxy polymer resin (PFA) dispersion comprising the second solvent, the surfactant and PFA particles, where the PFA dispersion has a solids content of 30-50 wt.% to form a second dispersion; and the step (d) as above per se; providing a substrate; coating the coating dispersion on the substrate; and curing the coating dispersion.