Durable carrier coating compositions comprising polysulfone

A carrier particle for electrostatographic developer mixtures, said carrier particle having an average diameter from between about 1 micron and about 1,000 microns, said carrier particle comprising a core having an outer coating, said outer coating comprising a polysulfone having the generic structure:

• ##STR3## where n may be any integer between 50 and 80.

A carrier particle for electrostatographic developer mixtures, said carrier particle having an average diameter from between about 1 micron and about 1,000 microns, said carrier particle comprising a core having an outer coating, said outer coating comprising a polyarylsulfone having the generic structure:

• ##STR4## where X may be any integer between 50 and 80.

A carrier particle for electrostatographic developer mixtures, said carrier particle having an average diameter from between about 1 micron and about 1,000 microns, said carrier particle comprising a metallic core having an outer coating, said outer coating comprising a substituted polysulfone wherein the substituent groups are selected from alkyl, halogen, alkoxy, acetoxy and amino groups.

A carrier particle for electrostatographic developer mixtures, said carrier particle having an average diameter from between about 1 micron and about 1,000 microns, said carrier particle comprising a core having an outer coating, said outer coating comprising a block copolymer consisting of polysulfone-siloxane.

A carrier particle for electrostatographic developer mixtures, said carrier particle having an average diameter from between about 1 micron and about 1,000 microns, said carrier particle comprising a core having an outer coating, said outer coating comprising a mixture of polysulfone and polymeric materials selected from the group consisting of polycarbonates, polyacrylates, polymethacrylates, polyacetates, and polyphenyl ethers.

A carrier particle for electrostatographic developer mixtures, said carrier particle having an average diameter from between about 1 micron and about 1,000 microns, said carrier particle comprising a metallic core having an outer coating, said outer coating comprising a polysulfone wherein said polysulfone has a tensile strength of between about 10,200 and about 13,000 psi at about 75.degree. F., a tensile elongation of between about 13 and about 100 percent, a flexural strength of between about 15,400 and about 17,000 psi, a Rockwell hardness of between about M-100 and about M-110, and a dielectric constant (60 Hz) of between about 3.14 and about 3.94 at about 75.degree. F.

A carrier particle for electrostatographic developer mixtures, said carrier particle having an average diameter from between about 1 micron and about 1,000 microns, said carrier particle comprising a metallic core having an outer coating present in an amount of from between about 0.5 micron and about 10 microns in thickness, said outer coating comprising a polysulfone.

An electrostatographic developer mixture comprising finely-divided toner particles electrostatically clinging to the surface of carrier particles having an average diameter from between about 1 micron and about 1,000 microns, said carrier particles comprising a core having an outer coating, said outer coating comprising a polysulfone.

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 having an average diameter from between about 1 micron and about 1,000 microns, said carrier particles comprising a core having an outer coating, said outer coating comprising a polysulfone, 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.