US5087540A
Expired / Lapsed
US
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Phthalocyanine photosensitive materials for electrophotography and processes for making the same
Assignee: Panasonic Holdings Corp
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Filing: 1990-07-12
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Granted: 1992-02-11
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Expires: 2010-07-12
Abstract
Abstract Photosensitive materials of the positive charging type which are useful in electrophotography are described. The material comprises a conductive support of any desired form and a photoconductive layer formed on the support. The photoconductive layer is made of X-type and/or τ-type phthalocyanine compound dispersed in a binder resin. The compound is dispersed partly in a molecular state and partly in a particulate state in the resin. To make such a dispersion, the compound is agitated in a solvent along with the binder resin until charge transportability and charge generating ability are developed in the resultant photoconductive layer. Fundamentally, single-layer photosensitive materials with good photosensitive characteristics and a high heat resistance can be obtained.
Inventors
- 👤 Mutsuaki Murakami
- 👤 Sohji Tsuchiya
- 👤 Atsushi Omote
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:23
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0525; G03G5/06; G03G5/0664; G03G5/0696
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
110 words
A photosensitive material for electrophotography which is adapted for positive charging and which comprises a conductive support and an organic photoconductive layer formed on the conductive support and formed from a mixture of the least one compound selected from the group consisting of X-type metal-free phthalocyanine and τ-type metal-free phthalocyanine and a binder resin which has been mixed in a solvent system for both the at least one compound and the binder resin such that said at least one compound is dispersed in said binder resin partly in a molecular state and partly in a particulate state and until said photoconductive layer exhibits both charge transportability and charge generating ability.
Claim 2
Dependent Claim
110 words
A photosensitive material for electrophotography which is adapted for positive charging and which comprises a conductive support and an organic photoconductive layer formed on the conductive support and formed from a mixture of the least one compound selected from the group consisting of X-type metal-free phthalocyanine and τ-type metal-free phthalocyanine and a binder resin which has been mixed in a solvent system for both the at least one compound and the binder resin such that said at least one compound is dispersed in said binder resin partly in a molecular state and partly in a particulate state and until said photoconductive layer exhibits both charge transportability and charge generating ability.
Claim 3
Dependent Claim
29 words
A photosensitive material according to claim 1, wherein said at least one compound is used at a mixing ratio by weight, to the binder resin, of 2:1 to 1:10.
Claim 4
Dependent Claim
17 words
A photosensitive material according to claim 1, wherein said at least one compound is X-type metal-free phthalocyanine.
Claim 5
Dependent Claim
17 words
A photosensitive material according to claim 1, wherein said at least one compound is τ-type metal-free phthalocyanine.
Claim 6
Dependent Claim
24 words
A photosensitive material according to claim 1, wherein said at least one compound is a mixture of X-type metal-free phthalocyanine and τ-type metal-free phthalocyanine.
Claim 7
Dependent Claim
73 words
A photosensitive material according to claim 1, wherein said at least one compound is X-type metal-free phthalocyanine compound which present in the photoconductive layer in such a way that a ratio of an X-ray diffraction intensity from a crystal plane with a lattice spacing of about 11.8 angstroms and an X-ray diffraction intensity from a crystal plane with a lattice spacing of about 9.8 angstroms is in the range of 1:1 to 1:0.1.
Claim 8
Dependent Claim
76 words
A photosensitive material according to claim 1, wherein said at least one charge generating compound is a τ-type phthalocyanine compound which is present in the photoconductive layer in such a way that a ratio of an X-ray diffraction intensity from a crystal plane with a lattice spacing of about 11.8 angstroms and an X-ray diffraction intensity from a crystal plane with a lattice spacing of about 9.8 angstroms is in the range of 1:1 to 1:0.1.
Claim 9
Dependent Claim
35 words
A photosensitive material according to claim 1, wherein said binder resin is a resin capable of being dissolved in a solvent which is able to at least partially dissolve the at least one phthalocyanine compound.
Claim 10
Dependent Claim
63 words
A photosensitive material according to claim 8, wherein said binder resin is a member selected from the group consisting of polyesters, polyvinyl acetate, polyvinyl chloride, polyvinylidene chloride, polycarbonates, polyvinyl butyral, polyvinyl acetoacetals, polyvinyl formal, polyacrylonitrile, polymethyl methacrylate, polyacrylates, copolymers of monomers for the above-defined polymers, poly(vinyl chloride/vinyl acetate/vinyl alcohol), poly(vinyl chloride/vinyl acetate/maleic acid, poly(ethylene/vinyl acetate), poly(vinyl chloride/vinylidene chloride), cellulose derivatives and mixtures thereof.
Claim 11
Dependent Claim
15 words
A photosensitive material according to claim 8, wherein said binder resin is methylphenylsiloxane or dimethylsiloxane.
Claim 12
Dependent Claim
17 words
A photosensitive material according to claim 8, wherein said binder resin is a methylphenylsiloxane or dimethylsiloxane-modified polymer.
Claim 13
Dependent Claim
31 words
A photosensitive material according to claim 11, wherein the polymer modified with the siloxane is an alkyd resin, an acrylic resin, a carbonate resin, a polyester resin or a polyimide resin.
Claim 14
Dependent Claim
22 words
A photosensitive material according to claim 8, wherein said binder resin is a mixture of methylphenylsiloxane or dimethylsiloxane and an organic polymer.
Claim 15
Dependent Claim
28 words
A photosensitive material according to claim 13, wherein said organic polymer is an alkyd resin, an acrylic resin, a carbonate resin, a polyester resin or a polyimide resin.
Claim 16
Dependent Claim
21 words
A photosensitive material according to claim 1, wherein said binder resin is a cured product of a heat or light-curable resin.
Claim 17
Dependent Claim
33 words
A photosensitive material according to claim 15, wherein said heat or light-curable resin is a polymer or copolymer of acrylates and/or methacrylates having a vinyl group or an epoxy group at side chains.
Claim 18
Dependent Claim
24 words
A photosensitive material according to claim 15, wherein said heat or light-curable resin is a polystyrene having a chalcone structure at side chains thereof.
Claim 19
Dependent Claim
15 words
A photosensitive material according to claim 1, wherein said photoconductive layer is a smoothed surface.
Claim 20
Dependent Claim
18 words
A photosensitive material according to claim 18, wherein said smoothed surface is formed by rolling the photoconductive layer.
Claim 21
Dependent Claim
90 words
A photosensitive material according to claim 19, wherein said smoothed surface is formed by mixing the at least one compound and the binder resin in a mixture of two solvents therefor having different boiling points, applying the mixture on the conductive support, heating the applied mixture to form the photoconductive layer on the support under so that a lower boiling solvent is mainly removed by the heating while leaving most of a higher boiling solvent, rolling the photoconductive layer, and drying the rolled layer to remove the higher boiling solvent.
Claim 22
Dependent Claim
29 words
A photosensitive material according to claim 1, wherein said photoconductive layer further comprises a charge generating compound other than the phthalocyanine used, which is dispersed in the binder resin.
Claim 23
Dependent Claim
39 words
A photosensitive material according to claim 1, further comprising a layer of a charge generating compound provided between said photoconductive layer and said conductive support, said charge generating compound being dispersed in a resin binder in a particulate form.
Claim 24
Dependent Claim
15 words
A photosensitive material according to claim 22, wherein said charge generating compound is a phthalocyanine.
Claim 25
Dependent Claim
43 words
A photosensitive material according to claim 22, wherein said charge generating compound is a compound selected from the group consisting of metal-free phthalocyanine compounds, metalo-phthalocyanine compounds, perylene compounds, thiapyrilium compounds, anthanthrone compounds, squalilium compounds, cyanine compounds, bisazo compounds, trisazo compounds and azulenium compounds.
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