US3884824A - Method and composition of mixed baso' 4 'and srso' 4 'for polishing a photoconductor surface - Google Patents

Method and composition of mixed baso' 4 'and srso' 4 'for polishing a photoconductor surface Download PDF

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Publication number
US3884824A
US3884824A US326561A US32656173A US3884824A US 3884824 A US3884824 A US 3884824A US 326561 A US326561 A US 326561A US 32656173 A US32656173 A US 32656173A US 3884824 A US3884824 A US 3884824A
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US
United States
Prior art keywords
polishing
srso
baso
sulfate
photoconductor
Prior art date
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Expired - Lifetime
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US326561A
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English (en)
Inventor
Kazunori Matsuo
Kohji Suzuki
Katutsohi Endo
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Ricoh Co Ltd
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Ricoh Co Ltd
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Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
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Publication of US3884824A publication Critical patent/US3884824A/en
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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/005—Materials for treating the recording members, e.g. for cleaning, reactivating, polishing

Definitions

  • amorphous selenium is preferably used as a photoconductor.
  • a layer of amorphous selenium constitutes a photoconductive layer for xerographic plates.
  • the layer of amorphous selenium is formed on a conductive substrate such as a copper or aluminium plate by vacuum evaporation.
  • the xerographic process consists of the steps of:
  • the toners are powders generally made of a mixture of carbon black and synthetic resin such as a styrenebutadiene copolymer. Accordingly, the synthetic resin is melted by fusing to affix the toners to the paper sheet. All of this is well known to those skilled in the art.
  • a DC. voltage of 6kV (or kV) is applied in the corona discharge and generally, an acceptance potential of about 750V (or about 700V) is obtained.
  • the acceptance potential which may be obtained is reduced to the extent of about 660V (or 600V) by repeatedly using the photoconductive layer, for example, 10 thousands times. This reduction of the acceptance potential is caused by the following factors:
  • solvents by which a toner film formed on the surface of the photoconductor is removed are also known.
  • One such solvent is isopropyl alcohol.
  • the present invention relates to polishing materials and methods for polishing the surface of amorphous selenium photoconductors.
  • Photoconductive layers used in this invention may be prepared as follows: the photoconductive'layer i.e. an amorphous selenium layer is formed on a conductive support (for example, an aluminum drum having a diameter of 17cm) by depositing a thin layer (about 50p. thick) of selenium by vacuum evaporation.
  • a conductive support for example, an aluminum drum having a diameter of 17cm
  • the dark resistivity of a selenium layer thus formed is lOQ.cm.
  • Toners used in this invention may be made as follows: a mixture of one part by weight of carbon black and ten parts by weight of butadiene-styrene copolymer is heated to a temperature of about 200C. After cooling, the mixture is finely divided to powders having a particle size of from lg. to 20a.
  • xerographic copying process comprising (1) charging by corona discharge of +6kV or +5kV, (2) image-wise exposure to light, (3) development, and (4) transferring was repeated about ten to twenty thousands times.
  • the deteriorated photoconductive layer thus obtained was polished with absorbent cotton holding each of the polishing materials mentioned below having particle size of 0.1;1. to 30/.L.
  • the polishing ability of each of the polishing materials was compared and evaluated, and it was found that strontium sulfate and barium sulfate are most effective.
  • the polishing materials are as follows: calcium carbonate (CaCO cerium oxide (Ce O Zirconium oxide (ZrO magnesium oxide (MgO), titanium oxide (TiO silicon oxide (SiO chromium oxide (Cr O aluminum silicate Al SiO magnesium silicate (Mg SiO calcium silicate (Ca SiO aluminum sulfate (Al (SO.,) calcium sulfate (CaSO strontium sulfate (SrSO barium sulfate (BaSO magnesium sulfate (MgSO zinc sulfide (ZnS), 'Zinc chloride (ZnC1 and kieselguhr.
  • SrSO or BaSO solely may be used individually as a polishing materials, but a mixture of SrSO and BaSO, in the ratio of 15:1 to 1:15 (by weight) is more effective. However, a suspension of said mixture in methyl alcohol, ethyl alcohol, propyl alcohol or isopropyl alcohol is most effective and efficient.
  • polishing material of the present invention is' used in the manner as illustrated below:
  • Polishing materials No. l No. 6 were prepared from the following ingredients:
  • the toner powders can easily be 10 1 N 6 a recovered acceptance potential bremoved y W p the Surface with soft Cotton, and tained by corona discharge was measured, and apthen the surface may be wiped with absorbent cotton pearance f the Surface was observed holding p py alcohol, 1f dislred-
  • the data and the results are shown in the table below:
  • EXAMPLE 2 An amorphous selenium photoconductor was allowed to stand for 6 months in the air.
  • the initial acceptance potential and reduced acceptance potential (after 6 months) obtained were respectively 750V and 650V by corona discharge of 6kV. After the deteriorated surface of photoconductor was polished with polishing materials No. 3, No. 4 and N0. 5 of Example 1, a recovered acceptance potential was measured.
  • the polishing materials No. 3, No. 4 and No. 5 gave respectively recovered acceptance potentials of 740V, 750V and 720V.
  • the polishing material of this invention may also be used in polishing photoconductive surfaces consisting of amorphous selenium containing a small amount of other elements such as tellurium, arsenic, sulfur or thallium.
  • Method for polishing a surface of photoconductor consisting essentially of amorphous selenium with polishing material, said polishing material comprising a mixture of strontium sulfate and barium sulfate.
  • amorphous selenium comprising a mixture of strontium sulfate and barium sulfate in the ratio of from 15:1 to 1:15 parts by weight, the particle size of the strontium sulfate and barium sulfate being from 0.1 p. to 30 u. v 5.
  • Polishing material of claim 4 suspended in an alkanol containing from 1 to 3 carbon atoms.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
US326561A 1972-02-17 1973-01-24 Method and composition of mixed baso' 4 'and srso' 4 'for polishing a photoconductor surface Expired - Lifetime US3884824A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47016724A JPS5133732B2 (enrdf_load_stackoverflow) 1972-02-17 1972-02-17

Publications (1)

Publication Number Publication Date
US3884824A true US3884824A (en) 1975-05-20

Family

ID=11924197

Family Applications (1)

Application Number Title Priority Date Filing Date
US326561A Expired - Lifetime US3884824A (en) 1972-02-17 1973-01-24 Method and composition of mixed baso' 4 'and srso' 4 'for polishing a photoconductor surface

Country Status (5)

Country Link
US (1) US3884824A (enrdf_load_stackoverflow)
JP (1) JPS5133732B2 (enrdf_load_stackoverflow)
CA (1) CA980954A (enrdf_load_stackoverflow)
FR (1) FR2172129B1 (enrdf_load_stackoverflow)
GB (2) GB1418102A (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5278438U (enrdf_load_stackoverflow) * 1975-12-09 1977-06-11
JPS5753762A (en) * 1980-09-18 1982-03-30 Ricoh Co Ltd Electrostatic photographic method
US4764448A (en) * 1985-04-05 1988-08-16 Mitsubishi Chemical Industries, Ltd. Amorphous silicon hydride photoreceptors for electrophotography, process for the preparation thereof, and method of use
US20020115386A1 (en) * 2000-05-25 2002-08-22 Takashi Iijima Method of grinding optical fiber connector

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2503744A (en) * 1947-08-12 1950-04-11 Great Lakes Carbon Corp Method and agent for preventing linting in the dry cleaning of fabrics
US2739129A (en) * 1948-10-02 1956-03-20 Henkel & Cie Gmbh Cleaning composition
US3702303A (en) * 1970-09-15 1972-11-07 Xerox Corp Cleaning of photoconductive insulating surfaces

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2503744A (en) * 1947-08-12 1950-04-11 Great Lakes Carbon Corp Method and agent for preventing linting in the dry cleaning of fabrics
US2739129A (en) * 1948-10-02 1956-03-20 Henkel & Cie Gmbh Cleaning composition
US3702303A (en) * 1970-09-15 1972-11-07 Xerox Corp Cleaning of photoconductive insulating surfaces

Also Published As

Publication number Publication date
DE2307743A1 (de) 1973-08-30
FR2172129A1 (enrdf_load_stackoverflow) 1973-09-28
GB1418103A (en) 1975-12-17
GB1418102A (en) 1975-12-17
CA980954A (en) 1976-01-06
JPS5133732B2 (enrdf_load_stackoverflow) 1976-09-21
FR2172129B1 (enrdf_load_stackoverflow) 1976-05-14
JPS4885236A (enrdf_load_stackoverflow) 1973-11-12
DE2307743B2 (de) 1977-01-27

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