公开(公告)号：US3798167A

公开(公告)日：1974-03-19

申请号：US3798167D

申请日：1971-01-28

Applicant: IBM

Inventor： KULKA W ,  MUNZEL H

IPC: G03G9/113 ,  G03G9/02 ,  G03G13/08

CPC classification number: G03G9/1134 ,  G03G9/1135 ,  G03G9/1137

Abstract: AN ELECTROPHOTOGRAPHIC DEVELOPMENT CARRIER COMPRISES CORE PARTICLES COATED WITH A FLUOROPOLYMER OR A MIXTURE OF A FLUOROPOLYMER AND A MODIFYING MATERIAL, WHEN UTILIZED WITH APPROPRIATE ELECTROSCOPIC TONER MATERIALS, THE CARRIER, WHICH IS COATED WITH THE MIXTURE OF THE FLUOROPOLYMER AND THE MODIFYING MATERIAL, IS EFFECTIVE IN PRODUCING A DESIRED POLARITY AND MAGNITUDE OF THE TRIBOELECTRIC CHARGE ON THE TONER PARTICLES, AND THE CARRIER, WHICH IS COATED WITH THE FLUOROPOLYMER, IS EFFECTIVE IN PRODUCING A TRIBOELECTRIC CHARGE OF A DESIRED MAGNITUDE ON THE TONER PARTICLES, CONTROL OF THE THE POLARITY AND MAGNITUDE OF THE TRIBOELECTRIC CHARGE CHARACTERISTIC OF THE THE CARRIER, WHICH HAS ITS PARTICLES COATED WITH THE MIXTURE OF THE FLUOROPOLYMER AND THE MODIFYING MATERIAL, IS OBTAINED BY HEATING THE COATED PARTICLES TO A SELECTED TEMPERATURE DEPENDING UPON THE DESIRED POLARITY AND MAGNITUDE AND THE PARTICULAR TONER WITH WHICH THE CARRIER IS USED, CONTROL OF THE MAGNITUDE OF THE TRIBOELECTRIC CHARGE CHARACTERISTIC OF THE CARRIER, WHICH IS COATED WITH THE FLUOROPOLYMER, IS OBTAINED BY CONTROLLING THE CURING CONDITIONS.