An electrostatic developer mixture with a coated carrier

Claim 2

AN ELECTROSTOGRAPHIC DEVELOPER MIXTURE COMPRISING FINELY DIVIDED TONER PARTICLES ELECTOSTATICALLY CLINGING TO THE SURFACE OF CARRIER PARTICLES, SAID CARRIER PARTICLES COMPRISING PARTICULATE CORES SURROUNDED BY A THIN OUTER LAYER, SAID THIN OUTER LAYER COMPRISING FROM ABOUT 1 TO ABOUT 20 MICRONS IN THICKNESS OF A BLEND OF POLYPHENYLENE OXIDE RESIN AND A SOLID TERPOLYMER OF (1) FROM ABOUT 5 TO ABOUT 94.5% BY WEIGHT OF AN UNSATURATED SILICON FREE ORGANIC COMPOUND (2) FROM ABOUT 94.5 TO ABOUT 5% BY WEIGHT OF AN UNSATURATED SILICON FREE ORGANIC COMPOUND DIFFERENT FROM THE COMPOUND OF (1) AND (3) FROM ABOUT 0.5 TO ABOUT 50% 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 UNSATRATED CARBON TO CARBON LINKAGE, THE WEIGHT RATIO OF SAID POLYPROPYLENE OXIDE TO SAID TERPOLYMER BEING FROM ABOUT 90:10 TO ABOUT 25:75.

Claim 3

An electrostatographic developer mixture comprising finely divided toner particles electrostatically clinging to the surface of carrier particles, said carrier particles comprising particulate cores 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%, by weight, of a styrene composition, (2) from about 94.5 to about 5%, by weight, of a composition selected from the group consisting of acrylate and methacrylate esters and (3) from about 0.5 to about 50%, 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 eight 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

An electrostatographic developer mixture comprising finely divided toner particles electrostatically clinging to the surface of carrier particles, said carrier particles comprising particulate cores 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%, by weight, of a styrene composition, (2) from about 94.5 to about 5%, by weight, of a composition selected from the group consisting of acrylate and methacrylate esters and (3) from about 0.5 to about 50%, 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 eight 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

An electrostatographic developer mixture comprising finely divided toner particles electrostatically clinging to the surface of carrier particles, said carrier particles comprising particulate cores 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%, by weight, of a styrene composition, (2) from about 94.5 to about 5%, 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%, by weight, of a polymerizable organosilicon composition 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 six 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 particles having a diameter of from about 40 to about 600 microns.

Claim 6

An electrostatographic developer mixture comprising finely divided toner particles electrostatically clinging to the surface of carrier particles, said carrier particles comprising particulate cores 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%, by weight, of a styrene composition, (2) from about 94.5 to about 5%, 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%, by weight, of a polymerizable organosilicon composition 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 six 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 particles having a diameter of from about 40 to about 600 microns.