公开(公告)号：US10761439B2

公开(公告)日：2020-09-01

申请号：US15668759

申请日：2017-08-04

Applicant: KYOCERA Document Solutions Inc.

Inventor： Jun Azuma ,  Kensuke Okawa ,  Seiki Hasunuma ,  Tomofumi Shimizu

IPC: G03G5/06 ,  G03G5/05 ,  C08G63/185 ,  C08G63/193 ,  C08G63/189

Abstract: An electrophotographic photosensitive member includes a photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, and a binder resin. The binder resin contains a polyarylate resin represented by general formula (1). In general formula (1), r and s each represent an integer of at least 0 and no greater than 49 and t and u represents an integer of at least 1 and no greater than 50. Furthermore, r+s+t+u=100 and r+t=s+u. X and Y each represent, independently of one another, a divalent group represented by chemical formula (1-1), (1-2), (1-3), or (1-4).

公开(公告)号：US10295918B2

公开(公告)日：2019-05-21

申请号：US15667678

申请日：2017-08-03

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tomofumi Shimizu ,  Keiji Maruo ,  Jun Azuma

IPC: G03G5/05 ,  G03G5/06 ,  G03G15/00 ,  G03G21/18

Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single-layer photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin contains a polyarylate resin (1). The polyarylate resin is represented by general formula (1). The photosensitive layer has a scratch resistance depth of no greater than 0.50 μm. The photosensitive layer has a Vickers hardness of at least 17.0 HV.

公开(公告)号：US09964869B2

公开(公告)日：2018-05-08

申请号：US15345726

申请日：2016-11-08

Applicant: KYOCERA Document Solutions Inc.

Inventor： Kensuke Okawa ,  Hideki Okada ,  Jun Azuma ,  Fumio Sugai ,  Kensuke Kojima

IPC: G03G5/047 ,  G03G5/06 ,  C07C211/54 ,  C07C217/92 ,  G03G5/05

CPC classification number: G03G5/0612 ,  C07C211/54 ,  C07C217/92 ,  G03G5/0525 ,  G03G5/0567 ,  G03G5/0609 ,  G03G5/0614 ,  G03G5/0618 ,  G03G5/0672 ,  G03G5/0696

Abstract: A triarylamine derivative represented by general formula (1) below. In the general formula (1), R1, R2, R4, R5, R6, R7, R8, and R9 each represent, independently from one another, a hydrogen atom, an optionally substitute alkyl group having a carbon number of at least 1 and no greater than 6, an optionally substituted alkoxy group having a carbon number of at least 1 and no greater than 6, or an optionally substituted aryl group having a carbon number of at least 6 and no greater than 14, R3 represents an alkyl group having a carbon number of at least 1 and no greater than 4, X represents an alkylene group having a carbon number of at least 1 and no greater than 6 or an oxygen atom, and n represents an integer of 1 to 3.

公开(公告)号：US09939744B2

公开(公告)日：2018-04-10

申请号：US15254012

申请日：2016-09-01

Applicant: KYOCERA Document Solutions Inc.

Inventor： Jun Azuma ,  Kensuke Okawa ,  Junichiro Otsubo ,  Akihiko Ogata

IPC: G03G5/06 ,  G03G5/05 ,  G03G5/047

CPC classification number: G03G5/0546 ,  G03G5/047 ,  G03G5/0507 ,  G03G5/0614 ,  G03G5/0672

Abstract: A multi-layer electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer includes a charge generating layer and a charge transport layer. The charge generating layer contains a charge generating material. The charge transport layer contains a charge transport material, a binder resin, and silica particles. The charge transport layer is a monolayer. The charge transport layer is disposed as an outermost surface layer of the multi-layer electrophotographic photosensitive member. The silica particles have a content of at least 0.5 parts by mass and no greater than 15 parts by mass relative to 100 parts by mass of the binder resin. The binder resin includes a polyarylate resin. The polyarylate resin has a repeating unit represented by general formula (I) shown below. In general formula (I), R1-R3 and Y are defined as those described in the specification.

公开(公告)号：US09933712B2

公开(公告)日：2018-04-03

申请号：US15247373

申请日：2016-08-25

Applicant: KYOCERA Document Solutions Inc.

Inventor： Akihiko Ogata ,  Hideki Okada ,  Jun Azuma ,  Kensuke Okawa

IPC: G03G5/06 ,  G03G5/05 ,  G03G5/047

CPC classification number: G03G5/0614 ,  G03G5/047 ,  G03G5/0525 ,  G03G5/0564 ,  G03G5/0609 ,  G03G5/0672 ,  G03G5/0696

Abstract: A multi-layer electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer includes a charge generating layer and a charge transport layer. The charge generating layer contains a charge generating material. The charge transport layer contains a hole transport material and a binder resin. The charge generating material contains a titanyl phthalocyanine that exhibits a main peak at a Bragg angle (2θ±0.2°) of 27.2° in a CuKα characteristic X-ray diffraction spectrum. The hole transport material contains a triarylamine derivative represented by generic formula (1). The hole transport material has a mass ratio of at least 0.30 and no greater than 0.55 relative to the binder resin in the charge transport layer. In general formula (1), R1, R2, l, and m are the same as those defined in the specification.