Charge roller
AssigneeHewlett-Packard Development Company, L.P.
InventorsYi Feng, Stanley J. Kozmiski, Shao-Wei Li
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Abstract
The present disclosure discloses a charge roller (1) particularly but not exclusively for charging a photoconductor in a liquid electro-photograph (LEP) image-forming apparatus. The charge roller includes a cured composition of an epichlorohydrin/ethylene oxide/allyl glycidyl ether terpolymer, a lithium salt and carbon black.
Claims19
A charge roller comprising a rubber, said rubber being obtainable by curing a composition comprising:
- a terpolymer of epichlorohydrin/ethylene oxide/allyl glycidyl ether,
- a lithium salt, and
- carbon black,
- wherein said rubber has an impedance at 8 KHz comprised between 10 and 20 KΩ and a DC resistance comprised between 30 and 50 KΩ when both impedance and resistance are measured by using an electrode of 323 mm long and 2 mm wide and an electrical source of 100V, in a rubber stabilized at 50% relative humidity and 23° C.
A charge roller comprising a rubber, said rubber being obtainable by curing a composition comprising:
- a terpolymer of epichlorohydrin/ethylene oxide/allyl glycidyl ether which has:
- an epichlorohydrin content which results in a terpolymer chlorine content comprised between about 18 and 20% by weight over the weight of the terpolymer, an allyl glycidyl ether content comprised between about 6.2 and 8.2% by weight over the weight of the terpolymer, the balance being ethylene oxide, and
- a Mooney viscosity comprised between about 40 and 54 when expressed as ML (1′+4′) and measured using ASTM D-1646 method
- lithium(bis)trifluoromethanesulfonimide, and
- carbon black,
- wherein the amount of lithium(bis)trifluoromethanesulfonimide in the composition is comprised between 1 and 4 expressed as weight parts per 100 weight parts of said terpolymer and wherein the amount of carbon black in the composition is comprised between 1 and 4 expressed as weight parts per 100 weight parts of said terpolymer.
Use of a combination of carbon black and a lithium salt as conductive agent in an epichlorohydrin/ethylene oxide/allyl glycidyl ether terpolymer-containing rubber.
Dependencies are inferred from the claim text.