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US 8,522,438 B2Granted
Developer rolls having a tuned resistivity method for making
AssigneeLexmark International, Inc.
InventorsBhaskar Gopalanarayanan, Kelly Ann Killeen, Johnny Dale Massie, II, Ronald Lloyd Roe, James Joseph Semler
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Abstract
A method for making a developer roll by molding a metal shaft with a conductive or semi-conductive soft rubber forming a rubber core and a coating deposited on the soft rubber core wherein the coating has a conductive agent. The outer surface of the soft rubber core is modified to form an —OH rich surface layer before the coating is deposited onto the outer surface of the rubber core to chemically bond therein.
Claims12
A method for making a developer roll having a tuned resistivity, comprising:
- molding a metal shaft with a conductive or semi-conductive soft rubber to form a rubber core;
- modifying an outside surface of the rubber core to form an —OH rich surface layer;
- coating the modified rubber core with a polyurethane prepolymer and a conductive additive;
- and
- adhering the coating to the outside surface of the rubber core by chemically bonding an isocyanate portion of the polyurethane prepolymer with the —OH rich surface layer.
2 more elements
Dependencies are inferred from the claim text.