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Mechanically-viable-developer-materials

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Mechanically viable developer materials

Details

Inventors: Mincer, Joseph L.; Pochan, John M.;
Assignee: Xerox Corporation (Stamford, CT)
Primary Examiner: Hoffman; James R.
Assistant Examiner:
Attorney, Agent or Firm:

Improved electrostatographic developer mixtures comprising finely-divided toner particles electrostatically clinging to the surface of carrier particles wherein the carrier particles comprise a core having an outer layer thereon of poly(2-vinyl-pyridine) mixed with polyurethane. The use of said developer mixtures for the development of electrostatic latent images is also described.

DETAILED DESCRIPTION What is claimed is: 1.
A carrier particle for electrostatographic developer mixtures, said carrier particle having an average particle diameter from between about 30 microns and about 1,000 microns, said carrier particle comprising a core having an outer coating, said outer coating comprising a mixture of poly(2-vinyl-pyridine) and polyurethane.
2.
A carrier particle for electrostatographic developer mixtures in accordance with claim 1 wherein said outer coating comprises from between about 90 percent and about 10 percent by weight of polyurethane and from between about 10 percent and about 90 percent by weight of poly(2-vinyl-pyridine), based on the weight of said outer coating.
3.
A carrier particle for electrostatographic developer mixtures in accordance with claim 1 wherein said outer coating comprises from between about 70 percent and about 30 percent by weight of polyurethane and from between about 30 percent and about 70 percent by weight of poly(2-vinyl-pyridine), based on the weight of said outer coating.
4.
A carrier particle for electrostatographic developer mixtures in accordance with claim 1 wherein said outer coating comprises from between about 60 percent and about 40 percent by weight of polyurethane and from between about 40 percent and about 60 percent by weight of poly(2-vinyl-pyridine), based on the weight of said outer coating.
5.
A carrier particle for electrostatographic developer mixtures in accordance with claim 1 wherein said polyurethane has a tensile strength of between 5300 psi and about 5700 psi, a tensile modulus of between about 700 psi and about 1700 psi, elongation of between about 300 percent and about 500 percent, and a tear strength of between about 300 pounds and about 400 pounds.
6.
A carrier particle for electrostatographic developer mixtures in accordance with claim 1 wherein said polyurethane has a molecular weight of less than about 50,000.
7.
A carrier particles for electrostatographic developer mixtures in accordance with claim 1 wherein said outer coating comprises from about 0

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