公开(公告)号：US10942482B2

公开(公告)日：2021-03-09

申请号：US16923119

申请日：2020-07-08

Applicant: Sumitomo Riko Company Limited

Inventor： Shimpei Miyagawa ,  Yoshihiro Saito

IPC: G03G21/10 ,  G03G21/00 ,  C08G18/02 ,  C08G18/80 ,  C09D175/06

Abstract: A method for manufacturing a blade for electrophotographic devices and a blade for electrophotographic devices are provided. The method includes: an impregnation step of impregnating, from the surface of at least a part of a blade-shaped substrate containing urethane rubber, with a blocked isocyanate in which an isocyanate group is blocked with a blocking agent, wherein the part includes a portion that comes into contact with a mating member; and a curing step of dissociating the blocking agent from the blocked isocyanate impregnated into the substrate in the impregnation step, and then curing the released isocyanate in the substrate to form a cured portion in at least the part of the substrate including the portion that comes into contact with the mating member. In the method, the isocyanate released from the blocked isocyanate includes an aromatic isocyanate.

公开(公告)号：US10444655B2

公开(公告)日：2019-10-15

申请号：US16383677

申请日：2019-04-15

Applicant: Sumitomo Riko Company Limited

Inventor： Yoshihiro Saito ,  Yasuhide Watanabe ,  Shigeki Kanda

IPC: G03G15/02 ,  H01B1/20 ,  G03G15/08 ,  F16C13/00

Abstract: The disclosure provides a charging roll for excellent image quality electrophotographic equipment. This charging roll for electrophotographic equipment is provided with a shaft body, an elastic body layer formed on the outer periphery of the shaft body, and a surface layer formed on the outer periphery of the elastic body layer, wherein the surface layer contains a modifier having polyamide and a hydroxyl group, and has a Bénard cell with a height of 0.1 to 1.0 μm on the surface thereof. A fluorine-based modifier having a hydroxyl group, a silicone-based modifier having a hydroxyl group, and an acrylic modifier having a hydroxyl group can be cited as examples of the modifier having the hydroxyl group.

公开(公告)号：US20250147446A1

公开(公告)日：2025-05-08

申请号：US19014233

申请日：2025-01-09

Applicant: Sumitomo Riko Company Limited

Inventor： Yoshihiro Saito ,  Junichiro Suenaga ,  Manami Murai

IPC: G03G15/02

Abstract: In a charging roll, at least one groove extending in a direction within ±46° relative to a circumferential direction is regularly formed in an axial direction on an outer peripheral surface of an elastic body layer. The groove has a width of 4 to 30 μm and a depth of 2 to 12 μm. A planar part being a portion of the outer peripheral surface of the elastic body layer other than the groove has a width of 4 to 30 μm. A specific relationship is present between an angle of the direction in which the groove extends relative to the circumferential direction and a ratio of the width of the groove to the width of the planar part. The surface layer includes a binder polymer and roughness forming particles. The roughness forming particles are respectively arranged on the planar part and the groove.

公开(公告)号：US12013650B2

公开(公告)日：2024-06-18

申请号：US18330337

申请日：2023-06-06

Applicant: Sumitomo Riko Company Limited

Inventor： Yoshihiro Saito ,  Hiroshi Ukai ,  Masanori Ishida

IPC: G03G15/02

CPC classification number: G03G15/0233

Abstract: In a charging roll, grooves regularly defining spirals are formed on an elastic body layer, with a groove width of 4 μm to 280 μm and a groove depth of 2 μm to 30 μm. On an outer peripheral surface of the elastic body layer, an area ratio between an area of a bottom surface of the groove and an area of a plane part is 0.3 to 2.4. The surface layer includes a binder polymer and a roughness forming particle. The roughness forming particle is arranged on the plane part and the groove. A surface roughness of the surface layer on the groove is 2 μm to 16 μm. A surface roughness of the entire surface layer is 5 μm to 26 μm. A thickness of the binder polymer covering the roughness forming particle on the groove is greater than that on the plane part.

公开(公告)号：US11215937B2

公开(公告)日：2022-01-04

申请号：US17226057

申请日：2021-04-08

Applicant: Sumitomo Riko Company Limited

Inventor： Kenta Nakazato ,  Shimpei Miyagawa ,  Takeru Horiuchi ,  Naoki Akira ,  Takenori Saito ,  Yoshihiro Saito

IPC: G03G15/02 ,  C09D109/00 ,  C09D109/02 ,  F16C13/00 ,  G03G15/08

Abstract: An elastic body layer is composed of a conductive rubber composition containing an isoprene rubber, a rubber other than the isoprene rubber, and carbon black. The elastic body layer is phase-separated into a first rubber phase containing the isoprene rubber and a second rubber phase containing the rubber other than the isoprene rubber; in the range of a 5 μm×5 μm square of an arbitrary cross section of the elastic body layer, the area ratio of the first rubber phase is within a range of 10 to 90%. The resistance value of the elastic body layer is within a range of 1.0×103 to 1.0×106Ω. A surface layer contains an electronic conductive agent and a crosslinked body of at least one polyurethane resin of an ether polyurethane resin and a carbonate polyurethane resin, and the glass transition point of the surface layer is within a range of −10 to −70° C.

公开(公告)号：US10859938B2

公开(公告)日：2020-12-08

申请号：US16676401

申请日：2019-11-06

Applicant: Sumitomo Riko Company Limited

Inventor： Yoshihiro Saito ,  Takeru Horiuchi ,  Shinkichi Kashihara

IPC: G03G15/02 ,  G03G15/20

Abstract: The present disclosure provides a charging member for electrophotographic equipment capable of providing constant and excellent uniform chargeability over a long period of time from low-temperature and low-humidity through high-temperature and high-humidity environments, while suppressing bleeding. A charging member for electrophotographic equipment includes an elastic layer and a surface layer formed around the elastic layer. The elastic layer includes the following (a) through (c): (a) an ion conducting agent that is solid at room temperature; (b) an ion conducting agent that is liquid at room temperature; and (c) an electron conducting agent with an average grain diameter of 25 to 90 nm and a DBP absorption of 152 ml/100 g or below.

公开(公告)号：US20180136577A1

公开(公告)日：2018-05-17

申请号：US15846876

申请日：2017-12-19

Applicant: Sumitomo Riko Company Limited

Inventor： Yoshihiro Saito ,  Takanori Ito ,  Masanori Ishida

IPC: G03G15/02

CPC classification number: G03G15/0216 ,  G03G15/0233

Abstract: To provide a charging roll for an electrophotographic apparatus capable of preventing image defects such as horizontal streaks and unevenness by particles added to a surface layer, and preventing the particles from falling off from the surface layer also during the endurance time.A charging roll 10 includes a shaft body 12, an elastic body layer 14 provided on the outer periphery of the shaft body 12, and a surface layer 16 provided on the outer periphery of the elastic body layer 14, wherein the surface layer contains (a) a binder, (b) particles having an average particle diameter of 10 to 120 micrometers, and (c) a polyphenol.

公开(公告)号：US11194266B2

公开(公告)日：2021-12-07

申请号：US17225108

申请日：2021-04-08

Applicant: Sumitomo Riko Company Limited

Inventor： Tatsuya Kibayashi ,  Yoshihiro Saito

IPC: G03G15/08

Abstract: Provided are a developing roll for an electrophotographic device and a method for manufacturing a developing roll for an electrophotographic device, with which toner fusion and toner filming are suppressed. A developing roll for an electrophotographic device includes a shaft body and an elastic body layer formed on an outer circumference of the shaft body. The surface of the elastic body layer has a plurality of large protruding parts having a width of 3.0 to 12 μm and a height of 3.0 to 12 μm, and the side surface of the large protruding part 16 has a plurality of small protruding parts which form convex-concavity having a ten-point average roughness Rz of 2.0 to 4.0 μm.

公开(公告)号：US11106151B2

公开(公告)日：2021-08-31

申请号：US17165968

申请日：2021-02-03

Applicant: Sumitomo Riko Company Limited

Inventor： Yoshihiro Saito ,  Hiroshi Ukai

IPC: G03G15/02

Abstract: In a charging roll for electrophotographic equipment, an outer surface layer of an elastic layer includes a binder resin, large-diameter particles having an average particle diameter of 15-50 μm, and small-diameter particles having an average particle diameter of 3-15 μm, a difference in average particle diameter between the large-diameter particles and the small-diameter particles is 10-35 μm, the small-diameter particles are arranged in one layer in the surface layer, the average distance between the small-diameter particles is not more than 1.2 times the average particle diameter of the small-diameter particles, the thickness a of the binder resin covering the large-diameter particles is within the range of 1.5-3.5 μm, the thickness b of the binder resin covering the small-diameter particles is 3.0-6.0 μm, and the thickness b is larger than the thickness a.

公开(公告)号：US12105436B2

公开(公告)日：2024-10-01

申请号：US18348336

申请日：2023-07-06

Applicant: Sumitomo Riko Company Limited

Inventor： Yoshihiro Saito ,  Shimpei Miyagawa

IPC: G03G15/02

CPC classification number: G03G15/0233

Abstract: A charging roll includes a shaft body, an elastic body layer formed on an outer circumferential surface of the shaft body, and a surface layer formed on an outer circumferential surface of the elastic body layer. The elastic body layer includes silicone rubber. A plurality of large protruding parts having a width of 13-48 μm and a height of 5-13 μm are provided on the outer circumferential surface of the elastic body layer, and a plurality of small protruding parts forming unevenness having a ten-point average roughness Rz of 1.0-6.0 μm are provided on the surface of the large protruding parts. The surface layer contains a urethane polymer, and the elongation at breakage of the surface layer is 285-525%.