Claims
- 1. A photosensitive material for electrophotography having an electrically conducting substrate and a photosensitive layer containing a charge-generating agent and a charge-transporting agent, wherein said charge-generating agent comprises (A) a P-type charge-generating pigment selected from the group consisting of X-type metal-free phthalocyanine, oxotitanyl phthalocyanine and metal-free naphthalocyanine and (B) an N-type charge-generating pigment wherein the P-type charge-generating pigment and the N-type charge generating pigment are present at a weight ratio of from 10:0.5 to 0.5:10; and at least part of said charge-generating agent is dispersed as aggregates in the photosensitive layer, said aggregates comprising a plurality of grains of the N-type charge-generating pigment gathered together and a plurality of grains of the P-type charge-generating pigment contacting the gathered together plurality of grains of the N-type charge-generating pigment, or a plurality of grains of the P-type charge-generating pigment gathered together and a plurality of grains of the N-type charge-generating pigment contacting the gathered together plurality of grains of the P-type charge-generating pigment.
- 2. A photosensitive material according to claim 1, wherein the N-type charge-generating pigment is selected from the group consisting of a perylene pigment, an azo pigment, a squarylium pigment, and a polycyclic quinone pigment.
- 3. A photosensitive material according to claim 1, wherein said aggregates have a grain size from 0.2 to 2 .mu.m.
- 4. A photosensitive material according to claim 1, wherein said photosensitive layer is a single dispersion photosensitive layer that contains the charge-generating agent and a charge-transporting agent.
- 5. A photosensitive material for electrophotography having an electrically conducting substrate and a photosensitive layer containing a charge-generating agent and a charge-transporting agent, wherein said charge-generating agent comprises (A) a P-type charge-generating pigment selected from the group consisting of X-type metal-free phthalocyanine, oxotitanyl phthalocyanine and metal-free naphthalocyanine, and (B) an N-type inorganic semiconductor or photoconductor; wherein at least part of said charge-generating agent is dispersed as aggregates in the photosensitive layer, said aggregates comprising a plurality of grains of the N-type inorganic semiconductor or photoconductor gathered together and a plurality of grains of the P-type charge-generating pigment contacting the gathered together plurality of grains of the N-type inorganic semiconductor or photoconductor or a plurality of grains of the P-type charge-generating pigment gathered together and a plurality of grains of the N-type inorganic semiconductor or photoconductor contacting the gathered together plurality of grains of the P-type charge-generating pigment.
- 6. The photosensitive material according to claim 5 where the weight ratio (A):(B) is in the range of from 10:1 to 1:40.
- 7. A photosensitive material according to claim 6 wherein the N-type inorganic semiconductor or photoconductor is a pigment selected from the group consisting of titanium dioxide, tin oxide, antimony-doped tin oxide, indium-doped tin oxide and zinc oxide.
- 8. The photosensitive material according to claim 5 where the weight ratio (A):(B) is in the range of from 2:1 to 6:40.
- 9. The photosensitive material according to claim 5 wherein the N-type inorganic semiconductor or photoconductor has a primary grain size of from 0.01 to 5 .mu.m.
- 10. A photosensitive material according to claim 5 wherein said aggregates have a grain size of from 0.2 to 2 .mu.m.
- 11. A photosensitive material according to claim 5 wherein said photosensitive layer is a single dispersion photosensitive layer that contains the charge-generating agent and the charge-transporting agent.
Priority Claims (2)
Number |
Date |
Country |
Kind |
5-159700 |
Jun 1993 |
JPX |
|
6-51522 |
Mar 1994 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 08/266,503, filed Jun. 27, 1994, which issued on Aug. 12, 1997, as U.S. Pat. No. 5,656,407.
US Referenced Citations (9)
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Entry |
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Continuations (1)
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Number |
Date |
Country |
Parent |
266503 |
Jun 1994 |
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