公开(公告)号：GB2123443A

公开(公告)日：1984-02-01

申请号：GB8318251

申请日：1983-07-06

Applicant: XEROX CORP

Inventor： CREATURA JOHN A ,  DICKERSON CHARLES G ,  STRELLA STEPHEN A

IPC: G03G9/10 ,  B22F1/00 ,  C23C8/18 ,  G03G9/107 ,  G03G9/113 ,  C23F7/02

Abstract: This invention is directed to an improved process for treating steel carrier core surfaces which comprises providing a steel carrier core composition, oxidizing in the air stream the surface of the carrier core at a temperature of from about 500 degrees Fahrenheit to about 1,000 degrees Fahrenheit, adding water to the air stream prior to accomplishing the oxidation reaction, at a partial pressure of water in excess of 20 millimeters of mercury, thereby resulting in carrier cores having a resistance of from about 105 ohm-cm to about 1012 ohm-cm.

公开(公告)号：JPH1115207A

公开(公告)日：1999-01-22

申请号：JP17404198

申请日：1998-06-05

Applicant: XEROX CORP

Inventor： CREATURA JOHN A ,  K DEREK HENDERSON ,  BERNARD A KELLY

IPC: G03G9/113

Abstract: PROBLEM TO BE SOLVED: To efficiently obtain resin coated carrier core particles at a low cost in the form of low porosity mechanically strong coated fine particles while using high porosity brittle core particles by blending 1st coated fine particles with a 2nd coating resin or resin Mixture and heating the blend to prepare 2nd coated fine particles or fine particles coated twice. SOLUTION: Core particles are blended with a 1st coating resin or resin mixture to prepare a 1st blend and the 1st blend is heated to prepare 1st coated particles. The 1st coated particles are blended with a 2nd coating resin or resin mixture to prepare a 2nd blend and the 2nd blend is heated to prepare 2nd coated particles or particles coated twice. The 1st coating resin is, e.g. a crosslinkable thermosetting resin such as polyurethane, polyester or a mixture of them. The 2nd coating resin is a polymer capable of imparting mechanical stability so as to make the core particles mechanically strong or a mixture of such polymers.

公开(公告)号：JPH10207127A

公开(公告)日：1998-08-07

申请号：JP620598

申请日：1998-01-16

Applicant: XEROX CORP

Inventor： SILENCE SCOTT M ,  CREATURA JOHN A ,  HSIEH BING R ,  ZIOLO RONALD F ,  ELLIS RICHARD W

IPC: G03G9/113

Abstract: PROBLEM TO BE SOLVED: To obtain a developer compsn. contg. carrier particles having almost uniform electric conductivity and a quantity of triboelectric charges in a wide range by coating cores with a mixture of a 1st polymer contg. an electrically conductive component with a 2nd polymer contg. copper iodide. SOLUTION: This developer compsn. contains carrier particles with coating layers of a polymer mixture on the cores. The mixture consists of a 1st polymer contg. a dispersed electrically conductive component such as carbon black and a 2nd polymer contg. dispersed copper iodide, especially cuprous iodide. The carrier has high electric conductivity in the wide range of about 10 -10 Ω/cm and a quantity of triboelectric charges in the wide range of about -30 to +30μC/g. The carrier particles hawing the constitution of polymer and conductive coating attains wide carrier electric conductivity and triboelectric charge. The carrier can be adapted to a printer, etc.