Back to results
US 11,029,618 B2Granted
Carrier, electrophotographic developer and production method of carrier
AssigneePowdertech Co., Ltd.
InventorsAya Sakuta, Makoto Ishikawa, Hiroki Sawamoto, Tetsuya Uemura
Life of this patent
Estimating the term…
Abstract
There is provided a carrier including a magnetic core material having a surface coated with a surfactant-containing resin mixture of an elemental fluorine-containing resin and a polyimide resin. The carrier has an elution amount of an eluted material into water in an elution test ranging from 180 ppm to 3,500 ppm.
Claims17
A carrier comprising:
- (i) a magnetic core material having a surface;
- and
- (ii) a resin coat layer coating the core material surface, wherein the resin coat layer comprises a mixture of:
- (a) an elemental fluorine-containing resin;
- (b) a polyimide (PI) resin having an imide bond in the main chain;
- and
- (c) a surfactant;
- wherein:
- the surfactant has an elution amount of from 180 ppm to 3,500 ppm, remaining in water in an elution test comprising mixing the carrier into the water, filtering the carrier from the water, and measuring a weight of eluted material remaining after being removed from the water and dried, and
- a mass ratio of the polyimide (PI) resin to the elemental fluorine-containing resin in the resin coat layer of 1/10 or more.
7 more elements
Dependencies are inferred from the claim text.