US 12,339,618 B2
Polyarylate resin and electrophotographic photosensitive member
Jun Azuma, Osaka (JP); Keiji Maruo, Osaka (JP); and Kenji Kitaguchi, Osaka (JP)
Assigned to KYOCERA Document Solutions Inc., Osaka (JP)
Filed by KYOCERA Document Solutions Inc., Osaka (JP)
Filed on Mar. 25, 2022, as Appl. No. 17/705,063.
Claims priority of application No. 2021-065334 (JP), filed on Apr. 7, 2021.
Prior Publication US 2022/0342326 A1, Oct. 27, 2022
Int. Cl. G03G 5/05 (2006.01); C08G 63/672 (2006.01); G03G 5/06 (2006.01)
CPC G03G 5/0567 (2013.01) [C08G 63/672 (2013.01); G03G 5/06145 (2020.05)] 12 Claims
OG exemplary drawing
 
1. A polyarylate resin comprising
repeating units represented by formulas (1), (2), (3), and (4), wherein
a third percentage is greater than 0% and less than 50%, the third percentage being a percentage of the number of repeats of the repeating unit represented by the formula (3) relative to a total of the number of repeats of the repeating unit represented by the formula (1) and the number of repeats of the repeating unit represented by the formula (3), and
a fourth percentage is at least 35% and less than 70%, the fourth percentage being a percentage of the number of repeats of the repeating unit represented by the formula (4) relative to a total of the number of repeats of the repeating unit represented by the formula (2) and the number of repeats of the repeating unit represented by the formula (4),

OG Complex Work Unit Chemistry
where in the formula (1),
R1 and R2 each represent a methyl group and X represents a divalent group represented by formula (X1), or
R1 and R2 each represent a hydrogen atom and X represents a divalent group represented by formula (X2),

OG Complex Work Unit Chemistry
where in the formulas (X1) and (X2), * represents a bond, and
wherein
a first percentage differs from a second percentage and the fourth percentage,
the third percentage differs from the second percentage and the fourth percentage,
the first percentage is a percentage of the number of repeats of the repeating unit represented by the formula (1) relative to the total of the number of repeats of the repeating unit represented by the formula (1) and the number of repeats of the repeating unit represented by the formula (3), and
the second percentage is a percentage of the number of repeats of the repeating unit represented by the formula (2) relative to the total of the number of repeats of the repeating unit represented by the formula (2) and the number of repeats of the repeating unit represented by the formula (4).