Coated developer carrier for electrophotography

Claim 2

A developer carrier for electrophotography comprising a plurality of core particles, said particles coated with a layer comprising a resin and a surface active agent incorporated therein, said agent containing at least one carbon-fluorine bond and having at least one functional group having an affinity for said resin.

Claim 3

A developer carrier according to claim 1 wherein the functional group is selected from the group consisting of --COOR, --OR, --NCO, --N(R) 2 , --N + (R) 3 , --CON(R) 2 , --SR, --OSO 3 R and --SO 3 R (wherein R represents a hydrogen, an alkyl group, an aryl group, an aralkyl group, an alkaryl group, a heterocyclic ring, an alkenyl group or salt of derivative of these group).

Claim 4

A developer carrier according to claim 2 wherein the surface active agent represented by the following general formula [I], [II], [III], [IV] or [V]: ##STR8## wherein R 1 and R 4 represent an alkyl group, an aralkyl group, an aryl group, a heterocyclic ring or a group derived therefrom, and at least one of R 1 and R 4 represent said group or ring, of which the whole or a part of a hydrogen has been substituted by a fluorine; R 2 , R 3 , R 6 and R 7 each represent a lower alkyl group; R 5 represents a divalent group; (X) - and (Y) - each represent an anion; and m and n each represent 0 or 1. ##STR9## wherein R 8 represents a group having at least 3 carbon atoms and at least 3 fluorine atoms attached to the carbon atoms; A represents a divelent atom or a divalent group; R 9 represents a divalent hydrocarbon group; R 10 , R 11 and R 12 represent individually an alkyl group having 1-6 carbon atoms, an aryl group or an aralkyl group; and (X) - represents an anion; and R 10 and R 12 , or R 10 , R 11 and R 12 can be form a 5- or 6-membered nitrogen-containing heterocylic ring together with nitrogen.

Claim 5

A developer carrier according to claim 3 wherein the divalent group for R 5 represents an alkylene group, an arylene group, an alkenylene group, an alkyleneoxyalkylene group, a polyoxyalkylene group or a divalent group combined with at least one of an alkylene group and at least one of an arylene group.

Claim 6

A developer carrier according to claim 3 wherein the divalent atom or the divalent group for A represents --O--, --S--, --NR'--, --SO 2 NR'--, --CONR'--, --NR'SO 2 --, --NR'CO--, --SO 3 --, --OSO 3 --, --CO--, --COO-- or --OCO-- (wherein R' represents an alkyl group or an aryl group).

Claim 7

A developer carrier according to claim 3 wherein the divalent hydrocarbon group for R 9 represents an alkylene group, an alkenylene group, an arylene group, an aralkylene group, an alkarylene group, an oxyalkyrene group, an oxyarylene group or a polyoxyalkyrene group.

Claim 8

A developer carrier according to claim 1 wherein the number of the carbon-fluorine bonds in the surface active agent is 1-40.

Claim 9

A developer carrier according to claim 1 wherein the proportion of the surface active agent to the resin contained in the coating layer is 0.1-60 weight %.

Claim 10

A developer carrier according to claim 1 wherein a thickness of the coating layer is 0.1-30 microns.

Claim 11

A developer carrier according to claim 9 wherein a thickness of the coating layer is 0.2-20 microns.

Claim 12

A developer carrier according to claim 1 wherein the resin is selected from the group consisting of an acrylic resins, a styrene resins, an epoxy resins, a urethane resins, a polyamide resins, a polyester resins, an acetal resins, a polycarbonate resins, a phenol resins, an olefine resins, a cellulose resins, a vinyl ester resins, a halogenated vinyl resins, a vinyl chloride-vinyl acetate resins, a halogenated rubbers, a polyolefins and blend resin thereof.

Claim 13

A developer carrier according to claim 1 wherein the core particle of the carrier is coated through an intermediate layer comprising of a resin with the coating layer.

Claim 14

A developer for electrophotography comprising a developer carrier and a toner, said developer carrier comprising a core particle of the carrier is coated with a coating layer comprising a resin and a surface active agent containing a carbon-fluorine bond, and said surface active agent have been incorporated into said resin.

Claim 15

A developer for electrophotography comprising a developer carrier and a toner, said developer carrier comprising a core particle of the carrier is coated with a coating layer comprising a resin and a surface active agent containing a carbon-fluorine bond, and said surface active agent have been incorporated into said resin.

Claim 16

A process for the preparation of a developer carrier for electrophotography having a plurality of core particles, said process comprising coating a layer on the surface of said particles by applying a solution comprising a resin and a surface active agent, said agent containing at least one carbonfluorine bond and having at least one functional group having an affinity for said resin.

Claim 17

A process for the preparation of a developer carrier for electrophotography having a plurality of core particles, said process comprising coating a layer on the surface of said particles by applying a solution comprising a resin and a surface active agent, said agent containing at least one carbonfluorine bond and having at least one functional group having an affinity for said resin.

Claim 18

A process according to claim 14 further comprising applying said solution to said surface, then drying said solution by evaporating the solvent forming said solution whereby a higher density of said agent is obtained at the outer surface of the layer than at the inner surface thereof.