Developing member including elastic member containing cured product of addition-curing silicone rubber mixture, processing cartridge including the developing member, and electrophotographic apparatus including the developing member
A developing roller includes: a mandrel; an elastic layer provided for an outer periphery of the mandrel, the elastic layer including an addition-curing silicone rubber; and a surface layer provided for an outer periphery of the elastic layer, in which: the elastic layer includes a compound represented by the following formula (1); when the content of such a compound that n in the formula (1) represents an integer of 3 to 12 in the elastic layer is represented by P1, and the content of such a compound that n in the formula (1) represents an integer of 13 to 20 in the elastic layer is represented by P2, P1+P2 is 5,000 ppm by mass to 12,000 ppm by mass; and P1 is 1,500 ppm by mass to 6,000 ppm by mass (In the formula (1), n represents an integer of 3 to 20):
1. A developing member, comprising:
a substrate;
an elastic layer provided on the substrate, the elastic layer comprising a cured product of an addition-curing silicone rubber mixture; and
a surface layer provided on the elastic layer,
wherein:
the elastic layer comprises a compound represented by the following formula (1):
in the formula (1), n represents an integer of 3 or more and 20 or less, and wherein:
when
a content of the compound in which n represents an integer of 3 or more and 12 or less in the elastic layer is represented by P1 ppm by mass, and
a content of the compound in which n represents an integer of 13 or more and 20 or less in the elastic layer is represented by P2 ppm by mass,
P1+P2 is 5,000 ppm by mass or more and 12,000 ppm by mass or less; and
P1 is 1,500 ppm by mass or more and 6,000 ppm by mass or less.
2. The developing member according to claim 1 , wherein the P1+P2 is 6,000 ppm by mass or more and 11,000 ppm by mass or less.
3. The developing member according to claim 2 , wherein the P1+P2 is 7,000 ppm by mass or more and 10,000 ppm by mass or less.
4. The developing member according to claim 1 , wherein the P1 is 2,000 ppm by mass or more and 5,500 ppm by mass or less.
5. The developing member according to claim 4 , wherein the P1 is 2,500 ppm by mass or more and 5,000 ppm by mass or less.
6. The developing member according to claim 1 , wherein the addition-curing silicone rubber mixture comprises the following component (A), component (B), and component (C):
(A) an organopolysiloxane having, in a molecule thereof, at least two alkenyl groups bonded to a silicon atom;
(B) an organopolysiloxane having, in a molecule thereof, at least three hydrogen atoms bonded to a silicon atom; and
(C) a platinum-based catalyst.
7. The developing member according to claim 6 , wherein the component (A) has a weight-average molecular weight of 20,000 or more and 200,000 or less.
8. The developing member according to claim 1 , wherein the elastic layer comprises an inorganic filler at a ratio of 0.1 mass % or more and 24 mass % or less.
9. A process cartridge, comprising:
a toner;
a toner container storing the toner; and
a developing member for carrying the toner in the toner container on a surface thereof and conveying the toner to a developing region,
the process cartridge being constituted to be attachable to and detachable from a main body of an electrophotographic apparatus,
wherein the developing member comprises the developing member according to claim 1 .
10. An electrophotographic apparatus, comprising:
a toner;
a toner container storing the toner; and
a developing member for carrying the toner in the toner container on a surface thereof and conveying the toner to a developing region,
wherein the developing member comprises the developing member according to claim 1 .