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US 5,288,573 AGranted
Photoconductive elements which are sensitive to near-infrared radiation
AssigneeEastman Kodak Company
InventorsYann Hung, William Mey, Ralph H. Young
Life of this patent
Estimating the term…
Abstract
Photoconductive elements which have high sensitivity to radiation in the near-infrared region of the electromagnetic spectrum comprise a conductive support, a charge generation material which includes a near-infrared-sensitive organic pigment and, electrically contiguous with the charge generation material, an aggregate photoconductive material. A preferred embodiment is bimodal.
Claims26
An electrophotographic element which comprises:
- (a) an electrically conductive support,
- (b) a charge generation material comprising a near-infrared-sensitive organic pigment,
- (c) an aggregate photoconductive material comprising a continuous, electrically insulating polymer phase and heterogeneously dispersed therein a co-crystalline complex of (i) at least one polymer having an alkylidene diarylene group in a recurring unit and (ii) at least one pyrylium dye salt, said organic pigment being admixed in a layer with said aggregate photoconductive material or being present in a separate layer in contact with a layer containing said aggregate photoconductive material, said separate layer having a thickness in the range from about 0.05 .mu.m to 6.0 .mu.m.
A multiactive electrophotographic element which comprises:
- (a) an electrically conductive support,
- (b) a charge generation layer containing a near-infrared-sensitive organic pigment,
- (c) a charge transport layer and,
- (d) an aggregate photoconductive material comprising a continuous, electrically insulating polymer phase and heterogeneously dispersed therein a co-crystalline complex of (i) at least one polymer having an alkylidene diarylene group in a recurring unit and (ii) at least one pyrylium dye salt, said organic pigment being admixed in a layer with said aggregate photoconductive material or being present in a separate layer in contact with a layer containing said aggregate photoconductive material, said separate layer having a thickness in the range from about 0.05 .mu.m to 6.0 .mu.m.
1 more element
A bimodal electrophotographic element comprising
- (a) an electrically conductive support,
- (b) a charge generation layer containing an organic pigment which absorbs radiation in the wavelength range from 700 to 900 nm, said charge generation layer having a thickness in the range from about 0.05 .mu.m to 6.0 .mu.m, and
- (c) electrically contiguous with said charge generation layer a charge transport layer which contains an organic charge transport material and an aggregate photoconductive material comprising a continuous, electrically insulating polymer phase and heterogeneously dispersed therein a co-crystalline complex of (i) at least one polymer having an alkylidene diarylene group in a recurring unit and (ii) at least one pyrylium dye salt.
A method of electrophotographic imaging utilizing near-infrared radiation, comprising the steps of:
- (a) charging the surface of an electrophotographic element, said element comprising:
- an electrically conductive support,
- a charge generation material comprising a near-infrared-sensitive organic pigment, and
- an aggregate photographic material comprising a continuous, electrically insulating polymer phase and heterogeneously dispersed therein a co-crystalline complex of (i) at least one polymer having an alkylidene diarylene group in a recurring unit and (ii) at least one pyrylium dye salt, said organic pigment being admixed in a layer with said aggregate photoconductive material or being present in a separate layer in contact with a layer containing said aggregate photoconductive material, said separate layer having a thickness in the range from about 0.05 .mu.m to 6.0 .mu.m,
- (b) exposing said element to actinic radiation, including near-infrared radiation, to form an electrostatic latent image,
- (c) developing the charged and exposed element by applying charged toner particles to said element to produce a toned image.
3 more elements
Dependencies are inferred from the claim text.