Classifications

• • 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
  • G03G5/02—Charge-receiving layers
  • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
  • G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
  • G03G5/0601—Acyclic or carbocyclic compounds
  • G03G5/062—Acyclic or carbocyclic compounds containing non-metal elements other than hydrogen, halogen, oxygen or nitrogen
• • 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
  • G03G5/02—Charge-receiving layers
  • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
  • G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
  • G03G5/0601—Acyclic or carbocyclic compounds
  • G03G5/0612—Acyclic or carbocyclic compounds containing nitrogen
• • 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
  • G03G5/02—Charge-receiving layers
  • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
  • G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
  • G03G5/0601—Acyclic or carbocyclic compounds
  • G03G5/0612—Acyclic or carbocyclic compounds containing nitrogen
  • G03G5/0614—Amines
  • G03G5/06142—Amines arylamine
• • 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
  • G03G5/02—Charge-receiving layers
  • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
  • G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
  • G03G5/0601—Acyclic or carbocyclic compounds
  • G03G5/0612—Acyclic or carbocyclic compounds containing nitrogen
  • G03G5/0614—Amines
  • G03G5/06142—Amines arylamine
  • G03G5/06144—Amines arylamine diamine

Definitions

• R is selected from the group consisting of hydrogen, alkyl, alkaryl and aryl; and n is selected from Oand 1.
• This invention relates to the optical sensitization of photoconductive materials and to methods of increasing the effectiveness of optical sensitizing dyes in photoconductive compositions useful injmage recording.
• this'invention relates to additives which may be incorporated into photoconductive zinc oxide systems with optical sensitizers to produce a supersensitizing effect.
• Photoconductive copysheets used in electrolytic electrophotography such as those described in US. Patent'Nos. 3,010,883 and 3,010,884, are desirably sensitized to improve and extend their spectral response and efficiency.
• electrostatic printing such as described in U.S. Patent Nos. 3,052,539 and 3,052,540
• the photoconductive sheets or coatings can also be dye sensitized. Because of the desirability of obtaining a white sheet color, the concentration of sensitizing dye is nor- .mallymaintained at minimum levels consistent with im 'proved spectral response.
• supersensitization may be considered as the increase in sensitivity which is obtained by the addition of certain materials, not necessarily sensitizers per se, to a sensitized system and which is not the result of a mere additive effect.
• supersensitization may be considered to be an exception to the general rule that the admixture of sensitizing dyes tends to reduce the overall sensitivity below that level provided by the respective components used individually.
• Another object of this invention is to provide increased speed of response in a photoconductive zinc oxide copysheet without objectionable sheet coloration.
• Still another object of this invention is to provide photoconductive copysheets suitable for use in electrolytic electrophotography having increased speed and sensitivity Without substantial increase in overall dark conductivity.
• a dye sensitized photoconductive layer of a photoconductive copysheet an organic compound which is a complexing agent for zinc ion and which contains the radical form a 5 or 6 membered heterocyclic ring (e.g. morpholino, piperidino, piperazino, etc, and Y is where R is hydrogen, alkyl, alkaryl or aryl (including the substituted derivatives thereof) and n is 0 or 1.
• an organic compound which is a complexing agent for zinc ion and which contains the radical form a 5 or 6 membered heterocyclic ring (e.g. morpholino, piperidino, piperazino, etc, and Y is where R is hydrogen, alkyl, alkaryl or aryl (including the substituted derivatives thereof) and n is 0 or 1.
• N,N-dimethylaniline have essentially no supersensitizing value when used in conjunction with inorganic photoconductive materials (e.g., zinc oxide, cadmium sulfide, indium oxide, etc), particularly as compared to the highly eifective ring substituted anilines such as p-dimethylaminobenzaldehyde and p-dimethylaminobenzoic acid.
• the s-upersensitizers of this invention may generally be used in amounts ranging from about 0.000l% to about 1.5% by weight of the photoconductive material, preferably from 0.0001% to about 1.5% by weight.
• the preferred supersensitizers are not optical sensitizers per se for photoconductive zinc oxide.
• a dispersion is prepared by ball milling for several hours a mixture of 2867 grams of powdered zinc oxide (U.S.P. 12), 2821 grams of toluene, milliliters of methanol and 2026 grams of a 30 weight percent solution of styrene-butadiene copolymer (30/70 mol ratio respectively) in toluene.
• the test compound is dissolved in a suitable solvent, e.g. methanol, to make a 2 weight percent solution, and 3.1 cubic centimeters of the resulting solution is added to 200 grams of the dispersion. After thorough mixing the sample is allowed to stand at room conditions for about 24 hours.
• a 3.5 milliliter quantity of the following sensitizing dye mixture is then added 'before coating:
• optical sensitizing dyes eig. cyanines, xanthenes, merocyanines, diand tri-phenyl methanes
• cyanines, xanthenes, merocyanines, diand tri-phenyl methanes can be used, since the supersensitizers of this invention have not been paper laminate, to provide a dry coating thickness of about 0.7 mil.
• the coated substrate is then exposed with a standard light spectrogram source through a calibrated step wedge or a continuous grey wedge. and electroiytically developed in a known manner.
• a control sample in which the test compound is omitted is prepared, exposed and electrolytically developed with the same procedure and under the same conditions. Visual examination and comparison of the developed samples will indicate whether the test compound performs, a supersensitizin'g function in the photoconductive layer.
• the amount of optical dye sensitizers included in the photoconductive layer along with the organic binder and photoconductor powder can be reduced, thereby improving sheet color.
• Essentially white or otf-white copysheets are most desired in electrolytic electrophotography.
• photoconductive material of r a supersensitizer in said layer comprising a organic compound which is a complexing agent for zinc ion and which contains the radical where R and R tare selected from the group consisting of hydrogen, alkyl, alkaryl, and atoms necessary to form a heterocyclic ring having from 5 to 6 members;
• Y is a radical selected from the group consisting of where R is selected from the group consisting of hydrogen, alkyl, alkaryl and aryl; and n is selected from and 1.
• a light sensitive recording element having an optically sensitized photoconductive zinc oxide layer and being suitable for use in electrolytic electrophotography, the improvement which comprises from about 0.0001% to about 1.5% by weight of zinc oxide of a supersensitizer in said layer comprising an organic compound which is a complexing agent for zinc ion and which contains the radical Ra Y- where R and R are selected from the group consisting of hydrogen, alkyl, alkaryl, and atoms necessary to form a heterocyclic ring having from 5 to 6 members; Y is a radical selected from the group consisting of s II c.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Photoreceptors In Electrophotography (AREA)
• Indole Compounds (AREA)

Priority Applications (3)

Applications Claiming Priority (1)

Publications (1)

Family

ID=23352145

Family Applications (1)

Country Status (3)

Cited By (5)

Citations (4)

• 1964
  • 1964-02-14 US US344811A patent/US3352670A/en not_active Expired - Lifetime
• 1965
  • 1965-01-21 GB GB2811/65A patent/GB1087273A/en not_active Expired
  • 1965-02-12 DE DE19651497177 patent/DE1497177A1/de active Pending

Patent Citations (4)

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