Dry type toner improvement with lubricant

• US 5,437,955 A
• Filed: 06/03/1994
• Issued: 08/01/1995
• Est. Priority Date: 07/17/1992
• Status: Expired due to Fees

• Current Assignee: Steven Bruce Michlin
• Original Assignee: Steven Bruce Michlin
• Inventors: Michlin, Steven B.
• Primary Examiner(s): RODEE, CHRISTOPHER D
• Application Number:
  US08/253,410
• Time in Patent Office: 424 Days
• Field of Search: 430/110, 430/106
• US Class Current: 430/108.4
• CPC Class Codes: C10M 103/00 Lubricating compositions characterised by the base-material being an inorganic material containing more than 10% water C10M173/00
• CPC Class Codes: C10M 129/40 monocarboxylic
• CPC Class Codes: C10M 169/04 Mixtures of base-materials and additives
• CPC Class Codes: C10M 2201/003 used as base material
• CPC Class Codes: C10M 2201/0403 used as base material
• CPC Class Codes: C10M 2201/0433 used as base material
• CPC Class Codes: C10M 2201/102 Silicates
• CPC Class Codes: C10M 2201/14 inorganic compounds surface treated with organic compounds
• CPC Class Codes: C10M 2207/125 having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
• CPC Class Codes: C10M 2207/126 monocarboxylic
• CPC Class Codes: C10M 2207/129 having hydrocarbon chains of thirty or more carbon atoms
• CPC Class Codes: C10N 2010/04 Groups 2 or 12
• CPC Class Codes: C10N 2040/00 Specified use or application for which the lubricating composition is intended
• CPC Class Codes: C10N 2040/30 Refrigerators lubricants or compressors lubricants
• CPC Class Codes: C10N 2040/32 Wires, ropes or cables lubricants
• CPC Class Codes: C10N 2040/34 Lubricating-sealants
• CPC Class Codes: C10N 2040/36 Release agents or mold release agents
• CPC Class Codes: C10N 2040/38 Conveyors or chain belts
• CPC Class Codes: C10N 2040/40 Generators or electric motors in oil or gas winning field
• CPC Class Codes: C10N 2040/42 Flashing oils or marking oils
• CPC Class Codes: C10N 2040/44 : Super vacuum or supercritical use
• CPC Class Codes: C10N 2040/50 : Medical uses
• CPC Class Codes: G03G 21/00 : Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
• CPC Class Codes: G03G 21/0005 : for removing solid developer or debris from the electrographic recording medium

Abstract

A dry toner composition for electrophotography includes a binder resin, a coloring agent and a mica-group mineral. The mica-group mineral provides the toner composition with lubricity and better flow capabilities. The mica-group mineral is wet-ground and may be coated with calcium stearate to reduce static electricity generated during operation of the printer, copier, or facsimile machine. The mica-group mineral and calcium stearate blend comprises ninety percent by weight or more of the mica-group mineral and ten percent by weight or less of the calcium stearate. The mica-group mineral or the mica-group mineral coated with calcium stearate makes up about zero-point-one to around fifteen percent by weight of the toner composition. The lubricant and flow agent formed by the mica-group mineral with or without the calcium stearate may be mixed into conventional dry toner as a post-additive. A mica-group mineral would be wet-ground to a very small particle size -for use in toners requiring smaller particle size and lower melting points for high speed printing operations.

Claims

1. A dry toner for electrophotography comprising a binder resin, a coloring agent, a mica-group mineral and calcium stearate, said mica-group mineral being coated with said calcium stearate to form a composition of ninety percent by weight or more of said mica-group mineral and ten percent by weight or less of said calcium stearate.

2. A dry toner as in claim 1 wherein said composition makes up zero-point-one to about fifteen percent by weight of said dry toner.

3. A dry toner as in claim 2 wherein said mica-group mineral has been wet-ground.

4. A dry toner as in claim 1 wherein said mica-group mineral has been wet-ground.

5. A dry toner as in claim 1 wherein said binder resin and said coloring agent have a particle size of one to five microns.

6. A dry toner as in claim 5 wherein said mica-group mineral has a particle size of about twelve microns.