Carrier compositions

Claim 2

An electrostatographic developer mixture as defined in claim 1 wherein said unsaturated polyester resin is derived from the allyl esters of unsaturated organic acids or anhydrides.

Claim 3

In an electrostatographic imaging process comprising the steps of forming an electrostatic latent image on a surface and developing said electrostatic latent image by contacting said latent image with an electrostatostatographic developer mixture comprising finely-divided toner particles electrostatically clinging to the surface of free-flowing carrier particles, said carrier particles comprising a core having a diameter between about 50 microns to about 600 microns wherein the improvement comprises coating said core with a first substantially continuous uniform layer comprising an at least partially cured hydrolyzed ambifunctional silane, silanol or siloxane, and a second substantially continuous uniform over-layer comprising an unsaturated polyester resin, said over-layer being capable of triboelectrifying the toner particles, said core material being capable of reacting with the first layer and of forming a bond therewith, and said first layer chemically coupling said second layer to said core upon curing, whereby at least a portion of said finely-divided toner particles are attracted to and held on said surface in conformance to said electrostatic latent image.

Claim 4

An electrostatographic imaging process as defined in claim 4 wherein said first layer comprises the at least partially cured hydrolyzed product of an ambifunctional organosilane, silanol, or siloxane containing from 1 to 3 hydrolyzable groups attached to the silicon atom and at least one functional organic group attached to said silicon atom.

Claim 5

An electrostatographic imaging process as defined in claim 4 wherein said unsaturated polyester resin is derived from the allyl esters of unsaturated organic acids or anhydrides.