Monolayer type photoconductor and image forming device

摘要

Provided is a monolayer type photoconductor superior in sensitivity characteristics that allows reliable production by easy confirmation of the sensitivity characteristics, and an image forming device using such a monolayer type photoconductor. A monolayer type photoconductor including a base body and a single photo sensitive layer formed on the base body, the single photo sensitive layer containing a charge generating agent, a hole transfer agent, an electron transfer agent and a binding resin, wherein a maximum absorption wavelength (λmax) of the photo sensitive layer is set to a value of below 850 nm and an absorbance (A850) of light at a wavelength of 850 nm per unit thickness of the photo sensitive layer is set to a value of 0.05 μm−1 or less.

主权项

1. A monolayer type photoconductor, comprising a base body and a single photo sensitive layer formed on the base body, the single photo sensitive layer containing a charge generating agent, a hole transfer agent, an electron transfer agent and a binding resin,
wherein the maximum absorption wavelength (λmax) of the photo sensitive layer is below 850 nm and an absorbance (A850) of light at a wavelength of 850 nm per unit thickness of the photo sensitive layer is 0.05 μm−1 or less, wherein the maximum absorption wavelength (λmax) of the photo sensitive layer and the absorbance (A850) of light at a wavelength of 850 nm per unit thickness of the photo sensitive layer satisfy the following relationship formula (1′):
17≦λmax/A850(1×10−12 m2)≦19.5  (1′)wherein the charge generating agent is a titanyl phthalocyanine crystal having maximum peaks at Bragg angles 2θ of 9.5°±0.2° and 27.2°±0.2°, in a CuKα X-ray diffraction spectrum,
wherein the titanyl phthalocyanine crystal has two peaks in a range of 50 to 400° C. by differential scanning calorimetry, with one peak due to vaporization of adsorbed water in the range of 50 to 270° C., and one peak in the range of 270 to 400° C., and wherein the titanyl phthalocyanine crystal having an absorbance of light at a wavelength of 400 nm, as determined as a solution obtained by suspending 1.25 parts by weight of the titanyl phthalocyanine crystal in 100 parts by weight of a mixed solvent of methanol and N,N-dimethylformamide (methanol:N,N-dimethylformamide=1:1 (by weight)) and filtering the suspension, in the range of 0.01 to 0.08 is used as the titanyl phthalocyanine crystal, and
the titanylphthalocyanine crystal is prepared in a production method including the steps of:
a) dissolving a crude titanyl phthalocyanine crystal in an acid to obtain a titanyl phthalocyanine solution;(b) adding the titanyl phthalocyanine solution dropwise into a poor solvent to obtain a wet cake;(c) washing the wet cake with an alcohol having 1 to 4 carbon atoms in a pigmentation treatment; and(d) heating and agitating the washed wet cake in a nonaqueous solvent to obtain the titanyl phthalocyanine crystal.