Coated carrier particles for electrostatographic development

Claim 2

A CARRIER PARTICLE FOR ELECTROSTATOGRAPHIC DEVELOPER MIXTURE COMPRISING A PARTICULATE CORE SURROUNDED BY A THIN OUTER LAYER, SAID THIN OUTER LAYER COMPRISING FROM ABOUT 1 TO ABOUT 20 MICRONS IN THICKNESS OF A BLEND OF A POLYPHENYLENE OXIDE RESIN AND A SOLID TERPOLYMER OF (1) FROM ABOUT 5 TO ABOUT 94.5 PERCENT, BY WEIGHT OF AN UNSATURATED SILICON FREE ORGANIC COMPOUND (2) FROM ABOUT 94.5 TO ABOUT 5 PERCENT, BY WEIGHT OF AN UNSTURATED SILICON FREE ORGANIC COMPOUND DIFFERENT FROM THE COMPOUND OF (1) AND (3) FROM ABOUT 0.5 TO ABOUT 50 PERCENT, BY WEIGHT OF A POLYMERIZABLE ORGANOSILICON COMPOUND SELECTED FROM THE GROUP CONSISTING OF SILANES, SILANOLS, AND SILOXANES HAVING FROM ONE TO THREE HYDROLYZABLE GROUPS AND AN ORGANIC GROUP ATTACHED DIRECTLY TO A SILICON ATOM CONTAINING LESS THAN 8 CARBON ATOMS AND AN UNSATURATED CARBON TO CARBON LINKAGE, THE WEIGHT RATIO OF SAID POLYPHENYLENE OXIDE TO SAID TERPOLYMER BEING FROM ABOUT 90:10 TO ABOUT 25:75

Claim 3

A carrier particle for electrostatographic developer mixtures comprising a particulate core surrounded by a thin outer layer, said thin outer layer comprising from about 1 to about 20 microns in thickness of a blend of a polyphenylene oxide resin and a solid terpolymer of (1) from about 5 to about 94.5 percent, by weight, of a styrene composition, (2) from about 94.5 to about 5 percent, by weight, of a composition selected from the group consisting of acrylate and methacrylate esters and (3) from about 0.5 to about 50 percent, by weight, of a polymerizable organosilicon composition selected from the group consisting of organosilanes, silanols, and siloxanes having from one to three hydrolyzable groups and an organic group attached directly to a silicon atom containing less than 8 carbon atoms and an unsaturated carbon to carbon linkage, the weight ratio of said polyphenylene oxide to said terpolymer being from about 90:10 to about 25:75.

Claim 4

A carrier particle for electrostatographic developer mixtures comprising a particulate core surrounded by a thin outer layer, said thin outer layer comprising from about 1 to about 20 microns in thickness of a blend of a polyphenylene oxide resin and a solid terpolymer of (1) from about 5 to about 94.5 percent, by weight, of a styrene composition, (2) from about 94.5 to about 5 percent, by weight, of a composition selected from the group consisting of acrylate and methacrylate esters and (3) from about 0.5 to about 50 percent, by weight, of a polymerizable organosilicon composition selected from the group consisting of organosilanes, silanols, and siloxanes having from one to three hydrolyzable groups and an organic group attached directly to a silicon atom containing less than 8 carbon atoms and an unsaturated carbon to carbon linkage, the weight ratio of said polyphenylene oxide to said terpolymer being from about 90:10 to about 25:75.

Claim 5

A carrier particle for electrostatographic developer mixtures comprising a particulate core surrounded by a thin outer layer, said thin outer layer comprising from about 1 to about 20 microns in thickness of a blend of a solid polyphenylene oxide resin and a solid linear addition terpolymer of (1) from about 5 to about 94.5 percent, by weight, of a styrene composition, (2) from about 94.5 to about 5 percent, by weight, of a methacrylate composition selected from the group consisting of methyl, ethyl, propyl, and butyl methacrylate and (3) from about 0.5 to about 50 percent, by weight, of a polymerizable organosilicon composition selected from the group consisting of silanes, silanols and siloxanes having from 1 to 3 hydrolyzable groups and an organic group attached directly to a silicon atom containing less than 6 carbon atoms and an unsaturated carbon to carbon linkage, the weight ratio of said polyphenylene oxide to said terpolymer being from about 90:10 to about 25:75, said carrier particle having a diameter of from about 40 to about 600 microns.

Claim 6

A carrier particle for electrostatographic developer mixtures comprising a particulate core surrounded by a thin outer layer, said thin outer layer comprising from about 1 to about 20 microns in thickness of a blend of a solid polyphenylene oxide resin and a solid linear addition terpolymer of (1) from about 5 to about 94.5 percent, by weight, of a styrene composition, (2) from about 94.5 to about 5 percent, by weight, of a methacrylate composition selected from the group consisting of methyl, ethyl, propyl, and butyl methacrylate and (3) from about 0.5 to about 50 percent, by weight, of a polymerizable organosilicon composition selected from the group consisting of silanes, silanols and siloxanes having from 1 to 3 hydrolyzable groups and an organic group attached directly to a silicon atom containing less than 6 carbon atoms and an unsaturated carbon to carbon linkage, the weight ratio of said polyphenylene oxide to said terpolymer being from about 90:10 to about 25:75, said carrier particle having a diameter of from about 40 to about 600 microns.