Coating agent for electrophotographic carrier and carrier coated

Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...

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430110, G03G 900

Patent

active

053689690

ABSTRACT:
The present invention provides a coating agent for an electrophotographic carrier comprising as a major component a copolymer of at least one monomer selected from the organopolysiloxanes represented by the following general formulas 1, 2, and 3 with other polymerizable monomer: ##STR1## wherein the general formulas 1, 2, and 3, R.sup.1 is hydrogen atom or methyl group; R.sup.2 is C.sub.1 -C.sub.10 alkyl or phenyl group; R.sup.3 is R.sup.2 or CH.sub.2 .dbd.C(R.sup.1)COOC.sub.3 H.sub.6 ; n, p, and q are defined as n.gtoreq.3, p.gtoreq.0, q.gtoreq.3, and p<q; and r is an integer of 2-20.
The coating agent for an electrophotographic carrier resists the formation of wear, peeling, cracks, and the like, which can also prevent the spent condition from occurring and thus, permits use over a long period of time; and it provides a long-life electrophotographic carrier in which the carrier charge characteristics exhibit low temperature dependency.

REFERENCES:
patent: 4277595 (1981-07-01), Deichert et al.
patent: 4977054 (1990-12-01), Honjo et al.

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