公开(公告)号：DE69029559T2

公开(公告)日：1997-05-22

申请号：DE69029559

申请日：1990-10-30

Applicant: CANON KK

Inventor： IKEDA TAKESHI ,  SATO YUKOU

IPC: G03G9/097 ,  G03G9/113 ,  G03G15/08

Abstract: 1. A carrier for electrophotography comprises carrier core particles and a coating resin material. The surfaces of the carrier core particles are each coated with the coating resin material and the coating resin material comprises a resin and a quaternary ammonium salt represented by the following formula: wherein R1, R2, R3 and R4 each represent an alkyl group, an aryl group or an aralkyl group and R1, R2, R3 and R4 may be the same or different from each other; and A represents an organic anion, an isopolyacid ion or a heteropolyacid ion.

公开(公告)号：DE69029559D1

公开(公告)日：1997-02-13

申请号：DE69029559

申请日：1990-10-30

Applicant: CANON KK

Inventor： IKEDA TAKESHI ,  SATO YUKOU

IPC: G03G9/097 ,  G03G9/113 ,  G03G15/08

Abstract: 1. A carrier for electrophotography comprises carrier core particles and a coating resin material. The surfaces of the carrier core particles are each coated with the coating resin material and the coating resin material comprises a resin and a quaternary ammonium salt represented by the following formula: wherein R1, R2, R3 and R4 each represent an alkyl group, an aryl group or an aralkyl group and R1, R2, R3 and R4 may be the same or different from each other; and A represents an organic anion, an isopolyacid ion or a heteropolyacid ion.

公开(公告)号：GB2159970A

公开(公告)日：1985-12-11

申请号：GB8510433

申请日：1985-04-24

Applicant: CANON KK

Inventor： SUEMATSU KOSHI ,  IKEDA TAKESHI ,  YAMAMOTO ATSUKO ,  GOTO KOJI ,  IMAI EIICHI

IPC: G03G9/08 ,  G03G15/08 ,  G03G9/087 ,  G03G9/097 ,  G03G13/08

Abstract: A substantially nonmagnetic toner comprising a colorant and a binder comprising a homopolymer or copolymer having a ratio (Mw/Mn) of a weight-average molecular weight (Mw) of a number average molecular weight (Mn) of less than 5.0 is formed in a thin layer on a toner carrying member. The layer of toner is carried to a developing zone at which an image bearing member is disposed to face the toner carrying member with a clearance larger than the toner layer thickness and an electrostatic image on the image bearing member is developed with the thin layer of toner. The toner binder resin preferably comprises a copolymer of a vinyl monomer and an amonoacrylic monomer.

公开(公告)号：DE3438430A1

公开(公告)日：1985-05-02

申请号：DE3438430

申请日：1984-10-19

Applicant: CANON KK

Inventor： SUEMATSU KOSHI ,  TAKENOUCHI MASANORI ,  URAWA MOTOO ,  IKEDA TAKESHI

IPC: G03G15/08 ,  G03G9/08 ,  G03G13/08 ,  G03G15/20

Abstract: A method for developing electrostatic latent images formed on an electrostatic image bearing member, particularly by a thin and uniform layer of toner formed on a toner carrying member. In the method, good images can be stably obtained by controlling the packing density within the range of 0.1 to 0.6 g/cm3 with respect to the toner layer carried on the toner carrying member at the developing station.

公开(公告)号：HK1002877A1

公开(公告)日：1998-09-25

申请号：HK98102015

申请日：1998-03-11

Applicant: CANON KK

Inventor： BABA YOSHINOBU ,  SATO YUKO ,  TOKUNAGA YUZO ,  IKEDA TAKESHI ,  ITABASHI HITOSHI

IPC: G03G9/10 ,  G03G9/107 ,  G03G9/113 ,  G03G

Abstract: A magnetic coated carrier suitable for constituting a two-component type developer for use in electrophotography is composed of magnetic coated carrier particles comprising magnetic carrier core particles and a resinous surface coated layer coating the magnetic carrier core particles. The carrier is suitably constituted so as to satisfy the condition of: (a) the magnetic carrier core particles has a resistivity of at least 1x10 ohm.cm, and the magnetic coated carrier has a resistivity of at least 1x10 ohm.cm, (b) the magnetic coated carrier has a number-average particle size of 1- 100 mu m and has such a particle size distribution that particles having particle sizes of at most a half of the number-average particle size occupy an accumulative percentage of at most 20 % by number, (c) the magnetic coated carrier has a shape factor SF-1 of 100 - 130, (d) the magnetic coated carrier has a magnetization at 1 kilo-oersted of 40 - 250 emu/cm , and (e) the resinous surface coating layer comprises a coating resin composition which in turn comprises a straight silicone resin and a coupling agent. The straight silicone resin includes trifunctional silicon and difunctional silicon in an atomic ratio of 100:0 - 40:60.

公开(公告)号：HK75094A

公开(公告)日：1994-08-05

申请号：HK75094

申请日：1994-07-28

Applicant: CANON KK

Inventor： HYOSU YOSHIHIKO ,  IKEDA TAKESHI ,  KANDA HITOSHI ,  MORI HIROMI ,  KAWAKAMI HIROAKI ,  KOBAYASHI KUNIKO

IPC: G03G9/08 ,  G03G9/087 ,  C08F2/44

Abstract: A toner for developing electrostatic latent images is produced by a process comprising the steps of: a) stirring at least water, hardly water-soluble inorganic fine powder and a specific compound thereby to prepare an aqueous dispersion medium; b) adding a polymerizable monomer composition comprising at least a polymerizable monomer and a polymerization initiator to the aqueous dispersion medium; c) forming particles of the polymerizable monomer composition in the aqueous dispersion medium; d) subjecting the particles of the polymerizable monomer composition to suspension polymerization, thereby to produce toner particles; and e) removing the hardly water-soluble inorganic fine powder attached to the surfaces of the toner particles by an aqueous alkaline or acidic solution.

公开(公告)号：DE3886061T2

公开(公告)日：1994-05-11

申请号：DE3886061

申请日：1988-02-12

Applicant: CANON KK

Inventor： HYOSU YOSHIHIKO ,  IKEDA TAKESHI ,  KANDA HITOSHI ,  MORI HIROMI ,  KAWAKAMI HIROAKI ,  KOBAYASHI KUNIKO

IPC: G03G9/08 ,  G03G9/087 ,  C08F2/44

Abstract: A toner for developing electrostatic latent images is produced by a process comprising the steps of: a) stirring at least water, hardly water-soluble inorganic fine powder and a specific compound thereby to prepare an aqueous dispersion medium; b) adding a polymerizable monomer composition comprising at least a polymerizable monomer and a polymerization initiator to the aqueous dispersion medium; c) forming particles of the polymerizable monomer composition in the aqueous dispersion medium; d) subjecting the particles of the polymerizable monomer composition to suspension polymerization, thereby to produce toner particles; and e) removing the hardly water-soluble inorganic fine powder attached to the surfaces of the toner particles by an aqueous alkaline or acidic solution.

公开(公告)号：DE3886061D1

公开(公告)日：1994-01-20

申请号：DE3886061

申请日：1988-02-12

Applicant: CANON KK

Inventor： HYOSU YOSHIHIKO ,  IKEDA TAKESHI ,  KANDA HITOSHI ,  MORI HIROMI ,  KAWAKAMI HIROAKI ,  KOBAYASHI KUNIKO

IPC: G03G9/08 ,  G03G9/087 ,  C08F2/44

Abstract: A toner for developing electrostatic latent images is produced by a process comprising the steps of: a) stirring at least water, hardly water-soluble inorganic fine powder and a specific compound thereby to prepare an aqueous dispersion medium; b) adding a polymerizable monomer composition comprising at least a polymerizable monomer and a polymerization initiator to the aqueous dispersion medium; c) forming particles of the polymerizable monomer composition in the aqueous dispersion medium; d) subjecting the particles of the polymerizable monomer composition to suspension polymerization, thereby to produce toner particles; and e) removing the hardly water-soluble inorganic fine powder attached to the surfaces of the toner particles by an aqueous alkaline or acidic solution.

公开(公告)号：DE3585769D1

公开(公告)日：1992-05-07

申请号：DE3585769

申请日：1985-10-21

Applicant: CANON KK

Inventor： IKEDA TAKESHI ,  IMAI EIICHI ,  FUKUMOTO HIROSHI ,  TANAKA KATSUHIKO ,  SUEMATSU KOSHI ,  URAWA MOTOO ,  TAKENOUCHI MASANORI

IPC: G03G9/097 ,  G03G15/08 ,  G03G9/08

公开(公告)号：DE3584942D1

公开(公告)日：1992-01-30

申请号：DE3584942

申请日：1985-10-21

Applicant: CANON KK

Inventor： IKEDA TAKESHI ,  IMAI EIICHI ,  FUKUMOTO HIROSHI ,  TANAKA KATSUHIKO ,  SUEMATSU KOSHI ,  URAWA MOTOO ,  TAKENOUCHI MASANORI

IPC: G03G9/097 ,  G03G15/08 ,  G03G9/08

Abstract: A triboelectrically chargeable composition for use in development of electrostatic latent images. The composition contains a substituted guanidine compound having at least one substituent group. The substituted guanidine compound is preferably one represented by the formulawherein R 1 , R 2 , R 3 , R 4 and R 5 are the same or different groups including hydrogen atom, alkyl, cycloalkyl, alkenyl, aryl, aralkyl, alkaryl, and heterocyclic groups, of which a hydrogen atom may be further replaced by a substituent group, and at least one of R', R 2 , R 3 , R 4 and R 5 is a group other than hydrogen. The composition is embodied typically as a positively chargeable toner and also as a charge-imparting material for charging a toner.