Carrier bead coating compositions

Claim 2

A carrier particle for electrostatographic developer mixtures comprising a core having an average diameter of from between about 30 microns and about 1,000 microns surrounded by a thin outer layer, said outer layer comprising a copolymer of vinyl pyridine and organosilicon wherein said organosilicon is selected from the group consisting of organosilanes, silanols and siloxanes having from 1 to 3 hydrolyzable groups and an organic group attached directly to a silicon atom containing an unsaturated carbon-to-carbon linkage.

Claim 3

A carrier particle for electrostatographic developer mixtures in accordance with claim 1 wherein said vinyl pyridine is selected from the group consisting of 2-vinyl pyridine, 4-vinyl pyridine, and 5-vinyl-2-methyl pyridine.

Claim 4

A carrier particle for electrostatographic developer mixtures in accordance with claim 1 wherein said organosilicon is gamma-methacryloxypropyltrimethoxy silane.

Claim 5

A carrier particle for electrostatographic developer mixtures in accordance with claim 1 wherein said copolymer is a terpolymer including a second vinyl monomer.

Claim 6

A carrier particle for electrostatographic developer mixtures in accordance with claim 4 wherein said second vinyl monomer is selected from the group consisting of styrene, alkyl acrylates, alkyl methacrylates, and esters thereof.

Claim 7

A carrier particle for electrostatographic developer mixtures in accordance with claim 4 wherein said second vinyl monomer is present in an amount of from between about 5 and about 25 parts by weight based on the weight of said terpolymer.

Claim 8

A carrier particle for electrostatographic developer mixtures in accordance with claim 1 wherein said copolymer comprises from between about 50 and about 98 parts by weight of said vinyl pyridine and from between about 2 and about 50 parts by weight of said organosilicon based on the weight of said copolymer.

Claim 9

A carrier particle for electrostatographic developer mixtures in accordance with claim 1 wherein said copolymer comprises from between about 85 and about 98 parts by weight of said vinyl pyridine and from between about 2 and about 15 parts by weight of said organosilicon based on the weight of said copolymer.

Claim 10

A carrier particle for electrostatographic developer mixtures in accordance with claim 1 wherein said copolymer comprises from between about 95 and about 98 parts by weight of said vinyl pyridine and from between about 2 and about 5 parts by weight of said organosilicon based on the weight of said copolymer.

Claim 11

A carrier particle for electrostatographic developer mixtures in accordance with claim 1 wherein said outer layer comprises from about 0.1 to about 2.0 percent by weight based on the weight of said carrier particle.

Claim 12

An electrostatographic developer mixture comprising finely-divided toner particles electrostatically clinging to the surface of carrier particles, said carrier particles comprising a core having an average diameter of from between about 30 microns and about 1,000 microns surrounded by a thin outer layer, said outer layer comprising a copolymer of vinyl pyridine and organosilicon wherein said organosilicon is selected from the group consisting of organosilanes, silanols and siloxanes having from 1 to 3 hydrolyzable groups and an organic group attached directly to a silicon atom containing an unsaturated carbon-to-carbon linkage.

Claim 13

An electrostatographic developer mixture comprising finely-divided toner particles electrostatically clinging to the surface of carrier particles, said carrier particles comprising a core having an average diameter of from between about 30 microns and about 1,000 microns surrounded by a thin outer layer, said outer layer comprising a copolymer of vinyl pyridine and organosilicon wherein said organosilicon is selected from the group consisting of organosilanes, silanols and siloxanes having from 1 to 3 hydrolyzable groups and an organic group attached directly to a silicon atom containing an unsaturated carbon-to-carbon linkage.

Claim 14

An electrostatographic imaging process comprising the steps of providing an electrostatographic imaging member having a recording surface, forming an electrostatic latent image on said recording surface, and contacting said electrostatic latent image with a developer mixture comprising finely-divided toner particles electrostatically clinging to the surface of carrier particles, said carrier particles comprising a core having an average diameter of from between about 30 microns and about 1,000 microns surrounded by a thin outer layer, said outer layer comprising a copolymer of vinyl pyridine and organosilicon wherein said organosilicon is selected from the group consisting of organosilanes, silanols and siloxanes having from 1 to 3 hydrolyzable groups and an organic group attached directly to a silicon atom containing an unsaturated carbon-to-carbon linkage, whereby at least a portion of said finely-divided toner particles are attracted to and deposited on said recording surface in conformance with said electrostatic latent image.

Claim 15

An electrostatographic imaging process comprising the steps of providing an electrostatographic imaging member having a recording surface, forming an electrostatic latent image on said recording surface, and contacting said electrostatic latent image with a developer mixture comprising finely-divided toner particles electrostatically clinging to the surface of carrier particles, said carrier particles comprising a core having an average diameter of from between about 30 microns and about 1,000 microns surrounded by a thin outer layer, said outer layer comprising a copolymer of vinyl pyridine and organosilicon wherein said organosilicon is selected from the group consisting of organosilanes, silanols and siloxanes having from 1 to 3 hydrolyzable groups and an organic group attached directly to a silicon atom containing an unsaturated carbon-to-carbon linkage, whereby at least a portion of said finely-divided toner particles are attracted to and deposited on said recording surface in conformance with said electrostatic latent image.