US 12,436,483 B2
Endless belt, belt unit, and image forming apparatus
Makoto Ochiai, Kanagawa (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed on Jun. 5, 2022, as Appl. No. 17/832,668.
Claims priority of application No. 2021-192551 (JP), filed on Nov. 26, 2021.
Prior Publication US 2023/0168610 A1, Jun. 1, 2023
Int. Cl. G03G 15/16 (2006.01); C08L 19/00 (2006.01)
CPC G03G 15/162 (2013.01) [C08L 19/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An endless belt comprising:
a base material layer containing a polymer material and conductive particles,
the polymer material contains at least one of chloroprene rubber or epichlorohydrin rubber, and the conductive particles contain carbon black,
a content of carbon black is 5 parts by mass or more and 40 parts by mass or less with respect to 100 parts by mass of the polymer material,
wherein in dynamic viscoelasticity measurement at a temperature of 35° C., a value of loss tangent of the base material layer at a measurement frequency in a range from 0.1 Hz to 10 Hz is smaller than a value of loss tangent of the base material layer at a measurement frequency in a range from 10 Hz to 100 Hz, and
tensile stress when the base material layer is stretched by 5% at a temperature of 24° C. is 7 MPa or more, and when the base material layer is stretched by 5% at a temperature of 24° C. and held for a period of 10 minutes, a maximum value TSmax and a minimum value TSmin of the tensile stress of the base material layer during the period satisfy a relationship of {(TSmax−TSmin)/TSmax×100}≤15.