公开(公告)号：BR7200454D0

公开(公告)日：1973-09-27

申请号：BR45472

申请日：1972-01-28

Applicant: IBM

Inventor： KREKLA W ,  MUNZEL H

IPC: G03G9/113

Abstract: 1373000 Electrostatographic carriers INTERNATIONAL BUSINESS MACHINES CORP 29 Dec 1971 [28 Jan 1971] 16972/74 Divided out of 1372998 Heading G2H [Also in Division B2] A coating of polytetrafluorethylene on electrostatographic carrier particles is cured by heating (e.g. to 780‹F) after which quenching is effected in water. The polytetrafluorethylene coating composition may contain a surface active agent, water and toluene. It may be applied by dipping, spraying, tumbling or fluidized bed treatment. The coating thickness may be 1-20Á. The carrier core material may be sand, glass or metal beads, or ferromagnetic material. It may have a particle size of 50-1,000Á.