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公开(公告)号：US10859935B2
公开(公告)日：2020-12-08
申请号：US16550452
申请日：2019-08-26
发明人： Takeshi Ohtsu , Tadashi Fukuda , Mikihiro Akasaki , Akinori Miyamoto , Kota Mori , Masami Hano , Takashi Kase , Daisuke Tsujimoto , Ryuichiro Matsuo , Kazuto Hosoi , Yoshihiro Ogawa
摘要： A toner includes toner particle containing at least a strontium titanate particle on the surface of the toner particle, and the toner is a water-washed toner from which strontium titanate particle desorbable by water washing are removed by water washing. The water-washed toner contains the strontium titanate particle having a number average particle diameter of primary particle (D1) of 10 nm or more and 150 nm or less, and when the distribution of an Sr element in the water-washed toner in the depth direction is determined, (i) the Sr element abundance on the outermost surface x satisfying 0.00
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2.发明申请公开(公告)号：US20200103777A1
公开(公告)日：2020-04-02
申请号：US16571427
申请日：2019-09-16
摘要： A magnetic carrier comprising a magnetic carrier core and a resin coating layer formed on the surface of the magnetic carrier core, wherein the resin coating layer includes a polymer having a structure represented by the following formula (1), and a content ratio of the structure represented by the formula (1) is from 5% by mass to 95% by mass based on a resin component of the resin coating layer, wherein, R1 is H or CH3, and X is a structure represented by the following formula (2): —(CmH2m)—R2—(CnH2n)—OH (2) wherein, R2 is a hydrocarbon group being a cyclic structure having 4 to 8 carbon atoms, and m and n are integers of 0 to 4.
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公开(公告)号：US10423090B2
公开(公告)日：2019-09-24
申请号：US16203864
申请日：2018-11-29
发明人： Takeshi Ohtsu , Yosuke Iwasaki , Wakiko Katsumata , Koh Ishigami , Masaharu Miura , Kentaro Kamae , Kenta Mitsuiki , Ryuichiro Matsuo , Yuichi Mizo
摘要： Provided is a magenta toner having a magenta toner particle containing a binder resin, a colorant, a wax, a wax dispersant, and a crystalline polyester, wherein the wax dispersant is a graft polymer in which a styrene acrylic resin is grafted to a hydrocarbon compound, and the styrene acrylic resin has a monomer unit having a saturated alicyclic group, the colorant contains C.I. Pigment Red 32, and when observing a cross-section of the magenta toner particle using a transmission electron microscope (TEM), crystals of the crystalline polyester are dispersed in the cross-section, and the number average value of maximum lengths of the crystals is 50 nm or less.
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公开(公告)号：US09969834B2
公开(公告)日：2018-05-15
申请号：US15244439
申请日：2016-08-23
发明人： Takeshi Ohtsu , Kentaro Kamae , Ryuichiro Matsuo , Yosuke Iwasaki , Wakiko Katsumata , Masaharu Miura , Koh Ishigami , Yuichi Mizo , Kenta Mitsuiki
IPC分类号： G03G9/087 , C08F255/02 , G03G9/08
CPC分类号： C08F255/02 , G03G9/0806 , G03G9/081 , G03G9/0821 , G03G9/08755 , G03G9/08782 , G03G9/08786
摘要： A wax dispersant for a toner including a polymer obtained by graft polymerization of a styrene-acrylic resin onto a hydrocarbon compound, wherein the styrene-acrylic resin has a structural segment derived from a saturated alicyclic compound, and a toner including a toner particle that contains a binder resin, a wax, and a polymer obtained by graft polymerization of a styrene-acrylic resin onto a hydrocarbon compound, wherein the styrene-acrylic resin has a structural segment derived from a saturated alicyclic compound.
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公开(公告)号：US20170242355A1
公开(公告)日：2017-08-24
申请号：US15431821
申请日：2017-02-14
发明人： Koh Ishigami , Takeshi Ohtsu , Kentaro Kamae , Ryuichiro Matsuo , Yosuke Iwasaki , Wakiko Katsumata , Kenta Mitsuiki , Masaharu Miura , Yuichi Mizo
IPC分类号： G03G9/08
CPC分类号： G03G9/0806 , G03G9/08 , G03G9/0802 , G03G9/081 , G03G9/08711 , G03G9/08755 , G03G9/08782 , G03G9/08795 , G03G9/08797
摘要： A toner having a toner particle that is produced through a step of melt-kneading a resin composition containing a binder resin, a colorant, a hydrocarbon wax, and a wax dispersing agent, cooling the obtained kneaded material, pulverizing the obtained cooled material, and heat treating the resulting resin particles, wherein the wax dispersing agent is a polymer provided by graft polymerizing a styrene-acrylic polymer onto a polypropylene, the styrene-acrylic polymer is a polymer having a monomer unit derived from a cycloalkyl (meth)acrylate, and specific relationships are satisfied where Mp(p) is the melting point (° C.) of the polypropylene and Mp(w) is the melting point (° C.) of the hydrocarbon wax.
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6.发明授权公开(公告)号：US10852653B2
公开(公告)日：2020-12-01
申请号：US16548382
申请日：2019-08-22
摘要： A magnetic carrier includes a magnetic carrier particle including a magnetic carrier core particle having an amino group on a surface thereof and a resin covering layer disposed on the surface of the magnetic carrier core particle, in which the resin covering layer contains a vinyl-based copolymer and a trialkoxyalkylsilane.
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公开(公告)号：US20200073266A1
公开(公告)日：2020-03-05
申请号：US16550452
申请日：2019-08-26
发明人： Takeshi Ohtsu , Tadashi Fukuda , Mikihiro Akasaki , Akinori Miyamoto , Kota Mori , Masami Hano , Takashi Kase , Daisuke Tsujimoto , Ryuichiro Matsuo , Kazuto Hosoi , Yoshihiro Ogawa
摘要： A toner includes toner particle containing at least a strontium titanate particle on the surface of the toner particle, and the toner is a water-washed toner from which strontium titanate particle desorbable by water washing are removed by water washing. The water-washed toner contains the strontium titanate particle having a number average particle diameter of primary particle (D1) of 10 nm or more and 150 nm or less, and when the distribution of an Sr element in the water-washed toner in the depth direction is determined, (i) the Sr element abundance on the outermost surface x satisfying 0.00
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8.发明申请公开(公告)号：US20200050123A1
公开(公告)日：2020-02-13
申请号：US16526501
申请日：2019-07-30
摘要： A magnetic carrier including a magnetic carrier particle having a magnetic carrier core and a resin coating layer formed on a surface of the magnetic carrier core, wherein the resin coating layer includes a resin component including a resin A and a resin B, the resin A is a copolymer of monomers including (a) a (meth)acrylic acid ester monomer having an alicyclic hydrocarbon group and (b) a specific macromonomer, the resin B is a copolymer of monomers including (c) a styrene-based monomer and (d) a specific (meth)acrylic acid ester monomer, and based on the resin components of the resin coating layer, the amount of the resin A is from 20% by mass to 99% by mass, and the amount of the resin B is from 1% by mass to 80% by mass.
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公开(公告)号：US20190171123A1
公开(公告)日：2019-06-06
申请号：US16203864
申请日：2018-11-29
发明人： Takeshi Ohtsu , Yosuke Iwasaki , Wakiko Katsumata , Koh Ishigami , Masaharu Miura , Kentaro Kamae , Kenta Mitsuiki , Ryuichiro Matsuo , Yuichi Mizo
CPC分类号： G03G9/091 , G03G9/0819 , G03G9/08735 , G03G9/08755 , G03G9/08782 , G03G9/08786 , G03G9/08797
摘要： Provided is a magenta toner having a magenta toner particle containing a binder resin, a colorant, a wax, a wax dispersant, and a crystalline polyester, wherein the wax dispersant is a graft polymer in which a styrene acrylic resin is grafted to a hydrocarbon compound, and the styrene acrylic resin has a monomer unit having a saturated alicyclic group, the colorant contains C.I. Pigment Red 32, and when observing a cross-section of the magenta toner particle using a transmission electron microscope (TEM), crystals of the crystalline polyester are dispersed in the cross-section, and the number average value of maximum lengths of the crystals is 50 nm or less.
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公开(公告)号：US10216108B2
公开(公告)日：2019-02-26
申请号：US15673672
申请日：2017-08-10
发明人： Yosuke Iwasaki , Takeshi Ohtsu , Kentaro Kamae , Ryuichiro Matsuo , Wakiko Katsumata , Kenta Mitsuiki , Masaharu Miura , Koh Ishigami , Yuichi Mizo
IPC分类号： G03G9/08 , G03G9/087 , C08F255/02 , G03G9/09
摘要： A toner production method including: a melt-kneading step of melt-kneading a resin composition including a binder resin, a colorant, a wax, and a wax dispersant to obtain a melt-kneaded product; and a pulverizing step of pulverizing the melt-kneaded product. Where the temperature of the melt-kneaded product at the end of the melt-kneading step is Tk (° C.), and the softening point of the wax dispersant is Tm (° C.), the relationship of −18≤[Tk−Tm]≤10 is satisfied. The wax dispersant is a polymer in which a styrene acrylic polymer is graft-polymerized to a polyolefin. The styrene acrylic polymer has a monomer unit derived from α-methylstyrene and a monomer unit derived from a cycloalkyl (meth)acrylate.
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