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CN1869824A - Organic photoreceptor, process cartridge, image forming method, and image forming apparatus - Google Patents

Organic photoreceptor, process cartridge, image forming method, and image forming apparatus Download PDF

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Publication number
CN1869824A
CN1869824A CN 200610071474 CN200610071474A CN1869824A CN 1869824 A CN1869824 A CN 1869824A CN 200610071474 CN200610071474 CN 200610071474 CN 200610071474 A CN200610071474 A CN 200610071474A CN 1869824 A CN1869824 A CN 1869824A
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organophotoreceptor
image
composition
photoreceptor
mentioned
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Inventor
早田裕文
浅野真生
志田和久
小仓都宏
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Konica Minolta Inc
Konica Minolta Business Technologies Inc
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Konica Minolta Inc
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Abstract

Disclosed is an organic photoreceptor possessing a photosensitive layer having a surface layer, provided on a conductive support, wherein the surface layer of the organic photoreceptor contains a block copolymer composed of a matrix component and a low surface energy component, and possesses a sea/island structure having domains formed by aggregating the low surface energy component in the block copolymer, and also disclosed are a process cartridge, an image forming method and an image forming apparatus, employing the foregoing organic photoreceptor.

Description

Organophotoreceptor, handle box, image forming method and image processing system
Technical field
The Organophotoreceptor that uses during the image that the present invention relates to the electrofax mode forms and adopt handle box, image forming method and the image processing system of this Organophotoreceptor, in more detail, Organophotoreceptor that uses during the image that relates to the electrofax mode of using in duplicating machine and printer field forms and handle box, image forming method and the image processing system that adopts this Organophotoreceptor.
Background technology
In recent years, in print field and colored printing field, used the duplicating machine of electrofax mode or the chance of printer increasing.In this print field or colored printing field, require the digital monochrome image of high image quality or the tendency of coloured image increasing.At this requirement, the someone proposes to adopt the exposing light beam that reduces exposure light source and forms the scheme (patent documentation 1) of high meticulous digital picture.Yet present situation is, reduces exposing light beam such as this semiconductor laser and stop down, even form a some sub-image by fine and closely woven some exposure on Organophotoreceptor, but the electrophotographic image that finally obtains still can not reach sufficient high image quality.
As one of its reason, can enumerate, adopt semiconductor laser etc., even on Organophotoreceptor, form fine and closely woven some sub-image, as toner image, still can not correctly reproduce with this sub-image.Promptly, the character of surface of Organophotoreceptor lacks the homogeneity in small unit, the point sub-image that is formed by semiconductor laser etc. is as reproducing than the little toner image of the size of sub-image, or the bigger toner image of conduct reproduces, can not form small and uniform toner image, or, be easy to generate problems such as transfer printing blank (only claiming blank later on) and image color reduction in fully transfer printing (transfer materials such as paper or intermediate transfer body etc.) on offset medium of the toner image that forms on the Organophotoreceptor.
As the method for improving the Organophotoreceptor character of surface, the someone proposes the organic photo surface and contains the Organophotoreceptor of fluorine resin particulate (patent documentation 2).These Organophotoreceptors that contain the fluorine resin particulate have the toner of preventing membranization etc., the characteristic that is difficult to contaminated surface, but be difficult to the fluorine resin particulate is disperseed with fine dimension in adhesive resin, the fluorine resin particulate separates with microstage with adhesive resin, and the result is easy to generate image blurring (ボ ケ).Also have, the superficial layer wear-resistant property of fluorine resin particulate is insufficient, and superficial layer is abraded easily, therefore, produces problems such as scratch are taken place medium tone (Ha one Off ト one Application) image easily.
[patent documentation 1] spy opens the 2001-255685 communique
[patent documentation 2] spy opens flat 8-328287 communique
The present invention makes in order to address the above problem a little.The purpose of this invention is to provide a kind of some sub-image that will adopt on the Organophotoreceptor that image exposure light source such as semiconductor laser forms, on Organophotoreceptor, reproduce, and the toner image of this reproduction verily is transferred to Organophotoreceptor on the offset medium as high fine and closely woven toner image.In addition, provide a kind of spatter property to improve, toner image on the Organophotoreceptor improves to the transfer printing of offset medium, can prevent the deterioration of blank generation or dot image, and the improved Organophotoreceptor of the spatter property of superficial layer, and provide handle box, image forming method and the image processing system that adopts this Organophotoreceptor.
Summary of the invention
Organophotoreceptor of the present invention, it is characterized in that, on the electric conductivity support, have in the Organophotoreceptor of photographic layer, the superficial layer of Organophotoreceptor comprises the segmented copolymer of have the matrix composition (A composition) and low-surface-energy composition (B composition), and the low-surface-energy composition that has in this segmented copolymer gathers the island structure that forms microcell.
Description of drawings
Fig. 1 is the skeleton diagram that has made up the function of image processing system of the present invention.
Fig. 2 is the sectional structure chart that forms device by the coloured image of one embodiment of this invention.
Fig. 3 is the section of structure that adopts the coloured image formation device of Organophotoreceptor of the present invention.
Embodiment
The inventor is to found that the problems referred to above point is inquired into repeatedly, for the some sub-image on the Organophotoreceptor that image exposure light sources such as adopting semiconductor laser is formed forms high fine and closely woven toner image, and, verily be transferred on the offset medium form the fine and closely woven toner image of this height from Organophotoreceptor, obtain final toner image, the technology that must develop is to make the character of surface of Organophotoreceptor can become uniform low-surface-energy state with small unit, and the good superficial layer technology of spatter property, finished the present invention based on this discovery.
Organophotoreceptor of the present invention, it is characterized in that, on the electric conductivity support, have in the Organophotoreceptor of photographic layer, the superficial layer of Organophotoreceptor comprises the segmented copolymer with matrix composition and low-surface-energy composition, and has that low-surface-energy composition in this segmented copolymer gathers and the island structure that forms microcell.
Organophotoreceptor of the present invention is by having above-mentioned formation, the point sub-image of formation such as employing semiconductor laser can be formed high fine and closely woven dot image, and, toner is good from the transfer printing of photoreceptor on offset medium, can prevent blank and dot image deterioration, the electrophotographic image that provides spatter property to improve.
Organophotoreceptor of the present invention, as the adhesive resin of superficial layer, employing be to have the block that constitutes the matrix composition and gather and form the segmented copolymer of two compositions of block of the low-surface-energy composition of microcell.
Here, low-surface-energy composition in the so-called segmented copolymer gathers and forms microcell, matrix compositions such as styrene acrylic resin in the expression segmented copolymer or polycarbonate form matrix (sea region of island structure), in the matrix that forms by the matrix composition, the polysiloxane of low-surface-energy composition etc. gathers, form microcell, this microcell is dispersed in the structure in this superficial layer.
So-called low-surface-energy composition, it is the composition that can form the low-surface-energy state, only the film of making of the low-surface-energy composition is compared the contact angle of pure water (20 ℃) with the film that only forms with the matrix composition the contact angle of pure water (20 ℃), show higher characteristic, this contact angle be more than 1 ° or 1 ° high value be preferred.
The measurement of contact angle method of Organophotoreceptor has been done record here.
The deviation measuring of contact angle and contact angle
The contact angle of photosensitive surface adopts full-automatic contact angle meter (the special type of CA-W type ロ one Le, consonance interface science society makes) to the contact angle of pure water, measures under 23 ℃, 50%RH environment.Be the variation of having both the measured value that measured value causes because of evaporation of water and the stability of mensuration, drip from water droplet and measured with interior termination in back 5 seconds to 30 seconds.Measure θ/2 methods that adopt.The contact angle value does not change in common water droplet weight range, but in the occasion of photoconductor drum, and from for be the direction detection at right angle axially, for ignoring bulging relatively curvature deviation, dripping quantity is set in 70 μ l.
Mensuration is to carry out in the moment as described below, promptly, the photoreceptor at initial stage when being added in the photoreceptor layers, when supplying with coating from the outside in addition, photoreceptor forms middle break-in at image, fully gives the moment (image that repeats at least more than 1000 or 1000 forms the back) of surface energy depressant at photosensitive surface.Measure the place and be central portion for cylindric photoreceptor, from 3 places of left and right end portions 5cm position, respectively at 4 per 90 ° places of circumferencial direction, totally 12 places measure, its mean value is as contact angle of the present invention, be offset this mean value maximum on the occasion of or negative value as deviate.
In addition, as the component of polymer that forms above-mentioned matrix composition, can adopt polystyrene composition, polystyrene acrylic component, polycarbonate composition, polyester composition, polyarylate composition, polyurethane to become to grade generally component of polymer that adhesive resin as Organophotoreceptor uses.Wherein, polystyrene acrylic component and polycarbonate composition are preferred.
The condensate composition of these matrix compositions does not get final product so long as do not contain the low-surface-energy composition, both can be block polymer, can be graft polymer yet, perhaps, can also contain crosslinked composition in this composition.
On the other hand, as the low-surface-energy composition, polysiloxane composition, fluorinated alkyl component of polymer, higher fatty acid alkyl etc. are preferred, and wherein, the polysiloxane composition most preferably.As the polysiloxane composition, for example, can enumerate dimethyl polysiloxane, hydrogenated methyl polysiloxane, phenyl methyl polysiloxane etc.As the fluorinated alkyl component of polymer, can enumerate the material that contains the perfluoroalkyl composition.As higher fatty acid alkyl composition, can enumerate caproic acid, sad, capric acid, lauric acid, palmitic acid (acid of ミ ス チ Application), hexadecanoic acid, stearic acid, behenic acid etc.
In addition, the low-surface-energy composition, employing is preferred at the composition of a terminal combination of segmented copolymer only.
The low-surface-energy composition, by only adopting composition in a terminal combination of segmented copolymer, can form high fine and closely woven dot image to the some sub-image of formation such as employing semiconductor laser, and toner is good to the transfer printing of offset medium from photoreceptor, prevent the deterioration of blank and dot image, thus the electrophotographic image that provides spatter property to improve more.
Also have, as following graft polymer (GP1), the polysiloxane of low-surface-energy composition a plurality of (more than 3 or 3) combination has the polymkeric substance of comb shape polysiloxane group, is difficult to form microcell at superficial layer.
As the synthetic method of adhesive resin, can enumerate known synthetic method with matrix composition and low-surface-energy composition.Promptly, example as free radical polymerization, can adopt the following dimethyl silicone polymer that contains azo group to make initiating agent, monomer component such as acrylate and styrene is dissolved in the solvent with this initiating agent, by free radical polymerization, can obtain the A-B copolymerization block polymer (only combining the A-B copolymerization block polymer of dimethyl silicone polymer) of polystyrene-acrylic acid block and dimethyl silicone polymer at an end.
[changing 1]
The above-mentioned dimethyl silicone polymer that contains azo group can be buied 2 kinds in market: VSP0501 (number-average molecular weight 5000 of polysiloxane) and VSP1001 (number-average molecular weight 10000 of polysiloxane) (making by Wako Pure Chemicals Ind Ltd).
Also have, synthetic method with the block polymer of condensation type polymers such as polycarbonate, also can adopt the synthetic method of known block copolymerization, can obtain being suitable for the A-B copolymerization block polymer (only combining the A-B or the B-A-B type copolymerization block polymer of dimethyl silicone polymer) of polycarbonate block of the present invention and dimethyl silicone polymer thus at an end or two ends.
Promptly; adopt 2; the aqueous slkali of bisphenol compounds such as two (the 4-hydroxy-3-methyl phenyl) propane of 2-; make the dichloromethane solution of polycarbonate oligomer by phosgenation; the dichloromethane solution of this polycarbonate oligomer mixes with 2-benzoyl-5-(3-dimethyl silicone polymer propoxyl group) phenol and antioxidant 4-tert-butyl phenol (PTBP); add NaOH etc. again, be formed in the segmented copolymer that the polycarbonate end has dimethyl silicone polymer.
By above-mentioned synthetic method, can obtain having the matrix composition that the present invention relates to and the segmented copolymer of low-surface-energy composition, enumerate the example of the segmented copolymer of preferred employing of the present invention below particularly.
[table 1]
The matrix composition The low-surface-energy composition Total molecular weight (Mn) The molecular weight of low-surface-energy composition (Mn) The mass ratio of low-surface-energy composition (%)
Block 1 St-MMA (6.5/3.5) copolymerization Dimethyl polysiloxane 18500 5000 3
Block 2 St-MMA (6.5/3.5) copolymerization Dimethyl polysiloxane 18500 5000 15
Block 3 St-MMA (6.5/3.5) copolymerization Dimethyl polysiloxane 18500 5000 35
Block 4 St-MA (6.5/3.5) copolymerization Dimethyl hydrogenation polysiloxane 18500 10000 20
Block 5 Polycarbonate (DM) Dimethyl polysiloxane 18500 5000 15
Block 6 Polycarbonate (Z) Dimethyl polysiloxane 18500 5000 25
Block 7 Polycarbonate (DM-Z) Dimethyl polysiloxane 18500 10000 15
Block 8 St-MMA (6.5/3.5) copolymerization The phenyl methyl polysiloxane 15000 10000 35
Block 9 St-MMA (6.5/3.5) copolymerization Perfluoroalkyl 14000 2000 25
Block 10 Polycarbonate (Z) Perfluoroalkyl 18000 2000 30
Block 11 St-MMA (6.5/3.5) copolymerization Hard ester acid 14000 283 15
Block 12 Polycarbonate (Z) Hard ester acid 14000 283 20
Block 13 St-MMA (6.5/3.5) copolymerization Behenic acid 14000 340 15
Block 14 Polycarbonate (Z) Behenic acid 18000 340 20
St is a styrene in the table 1, and MMA is a methyl methacrylate, and MA is a methyl acrylate.
Polycarbonate in the table 1 (DM), polycarbonate (Z) and polycarbonate (DM-Z) expression have the polycarbonate of following array structure.
[changing 2]
Polycarbonate (DM)
Figure A20061007147400091
Polycarbonate (Z)
Figure A20061007147400101
Polycarbonate (DM-Z)
Figure A20061007147400102
In the table 1, the mass ratio of so-called low-surface-energy composition (%), expression low-surface-energy composition is with respect to the mass ratio of segmented copolymer all-mass.
Also have, the block 1~4 and 11~14 in the table 1, all be the low-surface-energy composition only at the segmented copolymer of a terminal combination, block 5~10 can be confirmed to be the two kinds of compositions (employing NMR carries out data parsing) at an end and two ends.
The structure that the superficial layer that the present invention relates to has is, above-mentioned low-surface-energy composition gathers in the superficial layer forming process, forms the microcell of the number average primary particle size of 1~100nm, is dispersed in by styrene acrylic resin to become to grade in the matrix that forms.The diameter of this microcell, preferred number average primary particle size is 1~100nm.When less than 1nm, the improving effect and can not keep for a long time of contact angle, the effect of improving on surface descends easily.Also have, when greater than 100nm, under trickle state, superficial layer can not be formed the low-surface-energy state, toner image partly becomes insufficient from Organophotoreceptor to the transfer printing of offset medium, is easy to generate blank.In addition, when site diameter during greater than 100nm, image blurring or abrasive generation appears on the medium tone image easily.
The block polymer of A-B composition of the present invention, the little person of molecular weight of the molecular weight ratio A composition of B composition is preferred.It is 0.5 ten thousand~300,000 that the degree of polymerization of A composition is converted into number-average molecular weight, and the number-average molecular weight of B composition is 200~20000th, preferred, 500~15000th, and preferred.
The A composition of A-B that the present invention relates to or B-A-B type segmented copolymer and the number-average molecular weight of B composition are calculated by the molecular weight distribution determination that adopts GPC to measure.
,, add THF1ml here, at room temperature stir, make abundant dissolving with magnetic stirrer to measuring sample 0.5~5.0mg (that concrete is 1mg) as the assay method of measuring the molecular resin amount with GPC.Then, handle the back with the film filter of aperture 0.45~0.50 μ m and inject GPC.
As the condition determination of GPC, 40 ℃ make post stable after, flow into THF with the flow velocity of per minute 1ml, inject the about 100 μ l of 1mg/ml concentration sample and measure.Post, it is preferred being used in combination commercially available polystyrene shell post.For example, can enumerate, the Shodex GPC KF-801 that clear and electrician society makes, 802,803,804,805,806,807 combination, or eastern ソ one society TSKgelG1000H, the G2000H, G3000H, G4000H, G5000H, G6000H, the G7000H that make, the combination of TSK guard column etc.In addition, as detecting device, can adopt RI-detector (IR detecting device) or UV detecting device.The molecular weight determination of sample adopts the inspection amount line of being made by monodispersed polystyrene standard particle to calculate the molecular weight distribution that sample has.Make the polystyrene of usefulness as inspection amount line, adopt at about 10 and get final product.
Below, the structure of Organophotoreceptor of the present invention is illustrated.
Adopt the block polymer of above-mentioned A-B composition, form superficial layer, in order to form the microcell of the number average primary particle size that has gathered B composition 1~100nm on this superficial layer, the B components in proportions that adopts the block polymer of A-B composition is that the segmented copolymer of 5.1 quality %~45 quality % is preferred.When being lower than 5.1 quality %, being difficult to form the domain structure that gathers the B composition, and during greater than the ratio of 45 quality %, being difficult to produce continuous basal body structure (extra large structure), the easy variation of the mar proof of superficial layer.
In addition, the component of polymer such as polysiloxane of B composition, repetitive structure be about 10~1000 be preferred than the low polymerization degree person.When the polymer architecture of B composition was excessive, the B composition was difficult to cohesion, and domain structure is difficult to produce.
Also have, in order to form superficial layer, the choice of Solvent of dissolving above-mentioned A-B block polymer also is important.That is, selecting the matrix composition to above-mentioned block polymer is the solvent of good solvent (solvent of excellent dissolution matrix composition), and the coating solvent that is used for superficial layer is preferred.For example, it is preferred using tetrahydrofuran, toluene equal solvent.
By under this condition, forming superficial layer, can be formed on the superficial layer that forms the domain structure of B composition in the basal body structure (sea) that the adhesive ingredients by the A composition constitutes.
The number average primary particle size of the microcell that the present invention relates to, for the section infiltration type electron microscope observation that cuts off with microtome in the vertical direction of superficial layer, be amplified to 100000 times, select 100 particles to observe (as required arbitrarily as primary particle, the photography of taking a picture), by image analysis, rein in several mean diameters of (Off ェ レ) diameter as expense and measured.
In addition, microcell density is also observed by same expansion, measures the microcell number that exists in 100nm * 100nm section.
The microcell density of the superficial layer that the present invention relates to is to 10000nm 2Basal area, 2~10000 microcells that distribute are preferred.By having microcell with this density, can remain on the low-surface-energy state to photosensitive surface, can prevent toner membranization from the teeth outwards, improve toner image from the transfer printing of photoreceptor to offset medium, can prevent image deflects such as hollow.
In addition, the layer structure beyond the above-mentioned superficial layer is described as follows.
As Organophotoreceptor of the present invention, preferred Organophotoreceptor.The so-called Organophotoreceptor here, the Organophotoreceptor that refers at least a kind of function in the requisite electric charge generation function and charge transport function in the structure that has Organophotoreceptor in organic compound and constitute, the photoreceptor that is made of known organic charge generation material or organic charge transportation of substances, the electric charge generation function that is made of polymer complex compound and the known Organophotoreceptors such as photoreceptor of charge transport function are all included.
The structure of the photoreceptor that the present invention relates to, so long as have the getting final product of superficial layer of the island structure of the microcell that has formed the 1~100nm number average primary particle size that the low-surface-energy composition in the adhesive resin gathers, and be not particularly limited, for example, can enumerate down array structure:
1) on the electric conductivity support, stacks gradually charge generating layer and charge transport layer structure as photographic layer;
2) on the electric conductivity support, stack gradually charge generating layer, the 1st charge transport layer and the 2nd charge transport layer structure as photographic layer;
3) formation contains the structure of the individual layer of charge transport material and electric charge generating material as photographic layer on the electric conductivity support;
4) on the electric conductivity support, stack gradually charge transport layer and charge generating layer structure as photographic layer;
5) above-mentioned 1)~4) the photographic layer of photoreceptor on form the structure of sealer again.
Photoreceptor can have above-mentioned any structure.The superficial layer of so-called photoreceptor; it is the layer that photoreceptor contacts with air interface; this photographic layer is a superficial layer when only forming the photographic layer of single-layer type on the electric conductivity support, on the electric conductivity support single-layer type or stacked photographic layer and sealer when stacked sealer be superficial layer.In the present invention, adopt above-mentioned 2) structure be most preferred.Also have, when the photoreceptor that the present invention relates to has any structure, on the electric conductivity support, form photographic layer earlier, form substrate layer again and also can.
The charge transport layer that the present invention relates to, refer to and have the charge carrier that takes place at charge generating layer by the light exposure, be delivered to the layer of the lip-deep function of Organophotoreceptor, the concrete detection of this charge transport function can be stacked and detect the light conduction and confirmed on the electric conductivity support by charge generating layer and charge transport layer.
Below with most preferably use among the present invention above-mentioned 2) layer structure be example, the structure of concrete photoreceptor is described.
The electric conductivity support
As the electric conductivity support that uses in the photoreceptor that the present invention relates to, can adopt sheet or electric conductivity support cylindraceous.
The electric conductivity support cylindraceous that the present invention relates to means by rotation and can form the necessary cylindric support of image on annular tape loop, and cylindricity is that 5~40 μ m are preferred, and 7~30 μ m are preferred.
So-called cylindricity according to JIS standard (B0621-1984), that is, is used when clamping cylindrical base member by 2 coaxial geometric cylinders, and 2 coaxial cylinders become the difference of the radius of minimum position at interval and represent that in the present invention, the difference of this radius is represented with μ m.The assay method of cylindricity, to these 4 of trisection points between 2 points, central part, two ends and the central part of the two ends 10mm of cylindrical substrate totally 7 out of roundness measure and obtain.Analyzer adopts the omnipotent roller of noncontact directly to measure machine ((strain) ミ ッ ト ヨ manufacturing) and measures.
As the material of electric conductivity support, can adopt metal drum such as aluminium, nickel, or evaporation the plastics drum of aluminium, tin oxide, indium oxide etc., or be coated with the paper plastics drum of conductive material.As the electric conductivity support, be 10 than resistance under the preferred normal temperature 3Ω cm or 10 3Below the Ω cm.
The electric conductivity support that uses among the present invention also can adopt formation its surface to be carried out the material of the corrosion protection pellumina of sealing of hole processing.The corrosion protection alumina treatment for example carry out in acid baths such as chromic acid, sulfuric acid, oxalic acid, phosphoric acid, boric acid, sulfaminic acid usually, but the anodized in sulfuric acid can obtain optimal result.When in sulfuric acid, carrying out anodized, be that 100~200g/l, aluminium ion concentration are 1~10g/l, about 20 ℃ of liquid temperature, to apply under the condition of the about 20V of voltage be preferred at sulfuric acid concentration, but be not limited to this.In addition, the average film thickness of anodic oxidation coating is generally 20 μ m or below the 20 μ m, special preferred 10 μ m or below the 10 μ m.
The middle layer
In the present invention, between electric conductivity support and photographic layer, the middle layer with function of shielding can also be set.
In the present invention, in order to improve the cohesive between electric conductivity support and the above-mentioned photographic layer, or prevent from middle layer (comprising basalis) to be set between this support and above-mentioned photographic layer from this support iunjected charge.As the material in this middle layer, can enumerate polyamide, vestolit, vinyl acetate resin, and contain the copolymer resin more than 2 or 2 in the repetitive of these resins.Use and the little resin of the increase of residual electric potential as being accompanied by in these basalis resins repeatedly, polyamide is preferred.Also have, the thickness that adopts the middle layer of these resins is that 0.01~0.5 μ m is preferred.
In addition, the middle layer that the curable metal-resin of heat curing is carried out organometallicss such as silane coupling agent, titanium coupling agent in employing can be enumerated in preferred middle layer of using among the present invention.Adopting the thickness in the middle layer of curable metal-resin is that 0.1~2 μ m is preferred.
In addition, preferred middle layer of using among the present invention can be enumerated inorganic particulate and is dispersed in middle layer in the adhesive resin.The number average particle diameter of inorganic particulate is that 0.01~1 μ m is preferred.The middle layer of particularly surface treated N type semiconduction microparticulate in bonding agent is preferred.For example, can enumerate adopt silica alumina handle and silane compound to carry out the surface-treated number average particle diameter be that the titanium dioxide of 0.01~1 μ m is dispersed in the middle layer in the polyamide.The thickness in this middle layer is that 1~20 μ m is preferred.Number average particle diameter is by the infiltration type electron microscope observation, be amplified to 100000 times, select 100 particles to observe (photography of taking a picture as required) arbitrarily as primary particle, by image analysis, rein in the number mean diameter of (Off ェ レ) diameter as expense and measured.
So-called N type semiconduction particulate, expression has with the particulate of conductive carrier as the character of electronics.That is, so-called with the character of conductive carrier as electronics, be meant and effectively hinder from the hole of matrix and inject by this N type semiconduction particulate is included in the insulativity bonding agent, in addition, for the character that does not show block from the electronics of photographic layer.
Here the method for discrimination to N type semiconduction particle is illustrated.
(adopt the dispersion liquid of dispersed particle 50 quality % in the adhesive resin that is constituting the middle layer, form the middle layer) in the middle layer that forms thickness 5 μ m on the electric conductivity support.Make the charged one-tenth negative polarity in this middle layer, estimate light-decay characteristic.In addition, make charged one-tenth positive polarity, estimate light-decay characteristic equally.
When so-called N type semiconduction particle, the light-decay characteristic when being meant in the above-mentioned evaluation charged one-tenth negative polarity light-decay characteristic during than charged one-tenth positive polarity was big, the particle that is dispersed in the middle layer was called as N type semiconduction particle.
Above-mentioned N type semiconduction particulate can be enumerated titanium dioxide (TiO particularly 2), zinc paste (ZnO), tin oxide (SnO 2) wait particulate, in the present invention, adopt titanium dioxide preferred especially.
The N type that uses among the present invention is partly led the mean grain size of particulate, and the number average primary particle size is that the scope of 10nm~500nm is preferred, more preferably 10nm~200nm, special preferred 15nm~50nm.
Adopting number average primary particle size value is the middle layer of the N type semiconduction particulate of above-mentioned scope, and it is fine and close that the dispersion in layer can reach, and has sufficient potential stability and prevents the function that black border (Port チ) takes place.
The number average primary particle size of above-mentioned N type semiconduction particulate, when for example being titanium dioxide, by the infiltration type electron microscope observation, be amplified to 10000 times, select 100 particles to observe arbitrarily as primary particle, by image analysis, rein in several mean diameters of (Off ェ レ) diameter as expense and measured.
The shape of the N type semiconduction particulate that the present invention uses, dendroid, needle-like and shape such as granular are arranged, the N type semiconduction particulate of this shape, for example, when adopting Titanium particles, as crystal type, can enumerate Detitanium-ore-type, rutile-type and armorphous etc., any crystal type particle all can adopt, and in addition, the crystal type more than 2 kinds or 2 kinds mixes to use also can.Wherein, rutile-type is most preferred.
One of hydrophobization surface treatment that N type semiconduction particulate is carried out is that it is carried out repeatedly surface treatment, and this repeatedly in the surface treatment last surface treatment be to carry out surface treatment with reactive organo-silicon compound.In addition, to handle be the surface treatment more than at least a kind or a kind that is selected from aluminium oxide, silicon dioxide and the zirconia at least one subsurface in surface treatment repeatedly, and it is preferred carrying out surface treatment with reactive organo-silicon compound at last.
Also have, so-called alumina treatment, silica-treated and zirconia are handled, be meant at N type semiconduction microparticle surfaces and separate out aluminium oxide, silicon dioxide and zirconic processing, the aluminium oxide of separating out in these surfaces, monox and zirconia also comprise aluminium oxide, monox and zirconic hydrate.In addition, the surface treatment of so-called reactive organo-silicon compound is meant and adopts reactive organo-silicon compound in the treating fluid.
Therefore, surface treatment by N type semiconduction particulates such as Titanium particles is carried out more than 2 times or 2 times at least, N type semiconduction microparticle surfaces can carry out equably, and the surface coats (processing), when this surface-treated N type semiconduction particulate is used as the middle layer, can obtain the favorable dispersibility of the N type semiconduction particulate of the Titanium particles etc. in the middle layer, and the good photoreceptor of image deflects such as black border does not take place.
Photographic layer
The photographic layer structure of Organophotoreceptor of the present invention is to have the photographic layer that contains electric charge generation material and charge transport material on conductive base at least.This photographic layer, also can constitute by the photographic layer that electric charge generation material and charge transport material are present in one deck, but more preferably on the electric conductivity support, the stepped construction that contains the charge generating layer (CGL) of electric charge generation material and contain the charge transport layer (CTL) of charge transport material is preferred.Layer structure with this stepped construction is that the center illustrates Organophotoreceptor of the present invention below.
Charge generating layer
Charge generating layer: in charge generating layer, contain electric charge generation material (CGM).As other material, as required, can also contain adhesive resin and other adjuvants.
As electric charge generation material (CGM), can adopt known electric charge generation material (CGM).For example, can adopt phthalocyanine color, AZO pigments, perylene dye, Azulene pigment etc.Wherein, be accompanied by the increase of using residual electric potential repeatedly and can reach minimum CGM, be the CGM that has in the three-dimensional current potential structure of the stable coherent structure of a plurality of intermolecular formation, the concrete CGM that can enumerate phthalocyanine color, perylene dye with specific crystalline texture.For example, at 27.2 ° of phthalocyanines of locating to have maximum peak, same 2 θ are accompanied by and use deterioration hardly repeatedly at the CGM of 12.4 ° of Ben that locate to have maximum peak and Mi Zuo perylene etc. to Bragg angle 2 θ of Cu-K α line, and it is minimum that the increase of residual electric potential can reach.
When charge generating layer adopts bonding agent as the dispersion medium of CGM,, can adopt known resin as bonding agent.As most preferred resin, can enumerate vinyl-formal resin, polyvinyl butyral resin, silicone resin, silicone modified polyvinyl butyral resin, phenoxy resin etc.The ratio of adhesive resin and electric charge generation material is that 20~600 mass parts are preferred with respect to adhesive resin 100 mass parts.By adopting these resins, be accompanied by repeatedly and use, it is minimum that the increase of residual electric potential can reach.The thickness of charge generating layer is that 0.01 μ m~2 μ m are preferred.
Charge transport layer
As mentioned above, in the present invention, charge transport layer is made of a plurality of charge transport layers, and it is preferred that the charge transport layer of the superiors adopts the formation of surface layer structure of the present invention.
Charge transport layer contains charge transport material (CTM) and disperses CTM and the adhesive resin of film forming.As other material, can contain adjuvants such as antioxidant as required.
As charge transport material (CTM), it is preferred adopting known positive hole conveying property (P type) charge transport material (CTM).For example, can adopt triphenylamine derivative, hydrazone compound, compound of styryl, benzidine compound, adiene cpd etc.These charge transport materials are dissolved in usually in the suitable adhesive resin and carry out the formation of layer.Particularly, it is preferred adopting the charge transport material of the optical maser wavelength that does not absorb image exposure.
As the adhesive resin that uses in the charge transport layer (CTL), adopt any resin in thermoplastic resin, the heat-curing resin all to have no relations.For example, can adopt polystyrene, acryl resin, methacrylic resin, vestolit, vinyl acetate resin, polyvinyl butyral resin, epoxy resin, urethane resin, phenolics, vibrin, alkyd resin, polycarbonate resin, silicone resin, melamine resin and contain the copolymer resin more than 2 or 2 in the repeat unit structure of these resins.Or, macromolecule organic semiconductors such as these insulative resins and poly-N-vinyl carbazole.Wherein, the polycarbonate resin that water-intake rate is little, CTM is dispersed, the electrofax characteristic is good is most preferred.
The ratio of adhesive resin and charge transport material is that 50~200 mass parts are preferred with respect to adhesive resin 100 mass parts.In addition, the total thickness of charge transport layer is preferred at 20 μ m or below the 20 μ m, and 10~16 μ m are preferred.When this thickness during greater than 20 μ m, the absorption of the laser in the charge transport layer or scattering strengthen, and distinctiveness takes place easily reduce, and residual electric potential increases.
Also have, it is preferred containing antioxidant in the superficial layer that the present invention relates to.Low-surface-energy composition in the segmented copolymer gathers and forms in the superficial layer of island structure of microcell and has antioxidant, can prevent the deterioration of superficial layer, can prevent the deterioration of transferring properties or the deterioration of spatter property.So-called antioxidant, the autoxidation material that its representative substances exists in the Organophotoreceptor or organic photo surface, the material that under conditions such as light, heat, discharge, has the character of the effect that can prevent or suppress oxygen.Representational, can enumerate the following compounds group:
[changing 3]
[changing 4]
Figure A20061007147400182
Figure A20061007147400191
[changing 5]
Figure A20061007147400192
Figure A20061007147400201
[changing 6]
As the middle layer, charge generating layer, the solvent or the spreading agent that use during layer such as charge transport layer forms, can enumerate n-butylamine, diethylamine, ethylenediamine, isopropanolamine, triethanolamine, triethylenediamine, N, dinethylformamide, acetone, MEK, methyl isopropyl ketone, cyclohexanone, benzene, toluene, dimethylbenzene, chloroform, methylene chloride, 1, the 2-ethylene dichloride, 1, the 2-propylene dichloride, 1,1, the 2-trichloroethanes, 1,1, the 1-trichloroethanes, triclene, tetrachloroethane, tetrahydrofuran, two oxa-s, penta ring, two  alkane, methyl alcohol, ethanol, butanols, isopropyl alcohol, ethyl acetate, butyl acetate, dimethyl sulfoxide (DMSO), methyl cellosolve etc.The present invention is not limited to these, adopts methylene chloride, 1, and 2-ethylene dichloride, MEK etc. are preferred.In addition, these solvents can use separately, or use as mixed solvent more than 2 kinds or 2 kinds.
The image processing system of the Organophotoreceptor that employing be the present invention relates to is illustrated below.
Image processing system 1 shown in Fig. 1 is the image processing system with digital form, by image reading unit A, image processing part B, image forming part C, constitute as the transfer paper transport unit D of transfer paper conveyer.
On the top of image reading unit A, the automatic manuscript handling device of automatic transmission original copy is set, the original copy of mounting on the original copy mounting table 11 is carried out image and reads at 1 position 13a that reads that open to separate transmits by original copy transfer roller 12.Original copy is read the original copy of finishing, drain on the original copy row paper ware 14 with manuscript handling device 12.
On the other hand, the original image when on platen glass 13, placing, the speed v of the 1st reflecting unit 15 that is made of illuminating lamp that constitutes scanning optics and the 1st reflective mirror produces reads action; And, mobile the reading that equidirectional speed v/2 by the 2nd reflecting unit 16 that constitutes for the 2nd reflective mirror that is positioned at V word shape and the 3rd reflective mirror produce.
The image that reads is by projecting lens 17, imaging on as the sensitive surface of the imaging apparatus CCD of line sensor.The wire optical imagery of imaging on imaging apparatus CCD carries out light-to-current inversion successively and becomes A/D conversion in the electric signal (luminance signal), after image processing part B implements concentration conversion, filtration treatment etc. and handles, view data placeholder record in storer.
At image forming part C, as image formation unit, respectively successively by the action arranged in order: as the drum type photoreceptor 21 of image-carrier; Make the charged Charging system (charged operation) 22 of this photoreceptor 21 in its periphery setting; In order to detect the potential detection device 220 of charged photosensitive surface current potential; Developing apparatus (developing procedure) 23; Transfer printing conveyor-belt apparatus 45 as transfer device (transfer printing process); The cleaning device of above-mentioned photoreceptor 21 (cleaning process) 26 and as the PCL (preliminary filling electric light) 27 of optical discharge apparatus (light remove electrician's preface).In addition, be provided for measuring the reflection density pick-up unit 222 of the reflection density of sticking patch (the パ ッ チ) image that develops on the photoreceptor 21 in the downstream of developing apparatus 23.Photoreceptor 21 is used the Organophotoreceptor that the present invention relates to, make in illustrated clockwise driven in rotation.
To the photoreceptor 21 of rotation make by Charging system 22 equally charged after, by exposure optical system, carry out image exposure based on the picture signal of taking out from the storer of image processing part B as image exposing apparatus (image exposure operation) 30.Exposure optical system as the image exposing apparatus 30 of writing station, with not shown laser diode as illuminating source, through the rotation polygon reflective mirror 31, f θ lens 34, cylindrical lens 35, make the light path bending carry out main sweep by reflective mirror 32, carrying out image exposure facing in the Ao position of photoreceptor 21, by rotation (subscan) the formation electrostatic latent image of photoreceptor 21.In one of the present embodiment example, literal portion is exposed, form electrostatic latent image.
In image processing system of the present invention, when on photoreceptor, forming electrostatic latent image, adopt semiconductor laser or light emitting diode as the image exposure light source.Adopt these image exposure light sources, the exposure station of the main scanning direction that writes directly is contracted to 10~80 μ m, by in the enterprising line number word exposure of Organophotoreceptor, can obtain the high-resolution electrophotographic image of 400dpi (dpi: every 2.54cm counts)~2500dpi.
So-called above-mentioned exposure station footpath is meant the 1/e of this exposing light beam intensity along peak intensity 2Or 1/e 2The exposing light beam length of the main scanning direction in above zone (Ld: measure) at the length maximum position.
As the light beam that uses, the scanning optics of employing semiconductor laser and the scanistor of LED etc. are arranged, about light intensity distributions, Gaussian distribution and Lorentz distribution etc. are arranged, the 1/e of each peak intensity 2Or 1/e 2Above zone is as the exposure station footpath that the present invention relates to.
Electrostatic latent image on the photoreceptor 21 carries out discharged-area development by developing apparatus 23, forms visible toner image on photoreceptor 21 surfaces.In image forming method of the present invention, the developer that uses in this developing apparatus, it is preferred adopting polymerization toner.The polymerization toner of shape and even particle size distribution and Organophotoreceptor and the usefulness that the present invention relates to, can obtain distinctiveness good electron photographic image more whereby.
At transfer paper transport unit D, be provided as the paper feeding unit 41 (A) of the transfer paper storing unit of the transfer paper P that below image formation unit, deposits different size, 41 (B), 41 (C), in addition, the manual paper feeding unit 42 that carries out manual paper feeding is set in the side, the transfer paper P that selects from these any device, by guide roller 43 along transfer path 40 paper feedings, for inclination and skew to the transfer paper P that provides are revised, stop after roller 44 temporarily stops transfer paper P by paper feeding and to carry out paper feeding again, for transfer path 40, transfer printing preliminary roller 43a, feeding path 46 and enter guide plate 47 and lead, the toner image on photoreceptor 21 is at transfer position B oTransfer printing is carried out in transfer printing travelling belt 454 tops that are sent to transfer printing conveyor-belt apparatus 45 by the transfer printing utmost point 24 and the separation utmost point 25 limit mountings on transfer paper P, this transfer paper P from 21 separation of photoreceptor, is sent to fixing device 50 by transfer printing conveyor-belt apparatus 45 by disengaging pawl unit 250.
Fixing device 50 has fixing roller 51 and backer roll 52, passes through between fixing roller 51 and the backer roll 52 by making transfer paper P, and by heating, pressurizeing, so that toner fixing.The transfer paper P that toner image is finished drains on the discharge tray 64.
Illustrated above at the transfer paper single face and carried out the state that image forms, but when double-sided copying, switched row's paper switching member 170 that open transfer paper guide part 177, transfer paper P transmits along dotted line haircut direction.
In addition, by transmitting machinery 178 transfer paper P is sent to the below, by transfer paper counter-rotating portion 179, makes it to enter zigzaggery, the rearward end of transfer paper P becomes leading section, is sent to double-sided copying with in the paper feeding unit 130.
Transfer paper P moves in the paper feeding direction by being arranged on double-sided copying with the transmission guide rail 131 on the paper feeding unit 130, provides transfer paper P once more by feed roll 132, and transfer paper P is directed at transfer path 40.
In addition, as mentioned above, transfer paper P is transmitted in photoreceptor 21 directions, at the back side of transfer paper P transfer printing toner image, with draining into discharge tray 64 after fixing device 50 photographic fixing.
As image processing system of the present invention is inscapes such as above-mentioned photoreceptor, developer, clearer are combined into one as handle box and constitute, and also can be the structure of freely loading and unloading with this unit to device body.In addition, support to be one with at least 1 in charged device, image exposure device, developer, transfer printing or separation vessel and the clearer with photoreceptor, form handle box, as to device body being the single unit that freely loads and unloads, also can adopt the guide piece of track etc. of device body and the structure of free installing/dismounting.
Fig. 2 is the section pie graph that the coloured image of expression one embodiment of this invention forms device.
This coloured image forms device and is known as tandem type coloured image formation device, by 4 groups of image forming parts (image formation unit) 10Y, 10M, 10C, 10Bk; Ring-band shape intermediate transfer body unit 7; Constitute for paper transporting apparatus 21 and fixing device 24.At the top of the body A of image processing system configuration original image reading device SC.
Form the image forming part 10Y of yellow image, have: Charging system (charged operation) 2Y of configuration around as the drum type photoreceptor 1Y of the 1st image-carrier; Exposure device (exposure process) 3Y; Developing apparatus (developing procedure) 4Y; Primary transfer roller 5Y as primary transfer device (primary transfer operation); Cleaning device 6Y.Form the image forming part 10M of magenta color image, have: as drum type photoreceptor 1M, the Charging system 2M of the 1st image-carrier; Exposure device 3M; Developing apparatus 4M; Primary transfer roller 5M as the primary transfer device; Cleaning device 6M.Form the image forming part 10C of blue image, have: as drum type photoreceptor 1C, the Charging system 2C of the 1st image-carrier; Exposure device 3C; Developing apparatus 4C; Primary transfer roller 5C as the primary transfer device; Cleaning device 6C.Form the image forming part 10Bk of black image, have: as drum type photoreceptor 1Bk, the Charging system 2Bk of the 1st image-carrier; Exposure device 3Bk; Developing apparatus 4Bk; Primary transfer roller 5Bk as the primary transfer device; Cleaning device 6Bk.
Above-mentioned 4 groups of image formation unit 10Y, 10M, 10C, 10Bk are the center with photoconductor drum 1Y, 1M, 1C, 1Bk, by Charging system 2Y, 2M, 2C, the 2Bk of rotation; Image exposing apparatus 3Y, 3M, 3C, 3Bk; Developing apparatus 4Y, 4M, 4C, the 4Bk of rotation, and cleaning device 5Y, 5M that photoconductor drum 1Y, 1M, 1C, 1Bk are cleaned, 5C, 5Bk formation.
Above-mentioned image formation unit 10Y, 10M, 10C, 10Bk, the color difference of the toner image that forms respectively on photoreceptor 1Y, 1M, 1C, 1Bk only, and structure is identical is so be that example is described in detail with image formation unit 10Y.
Image formation unit 10Y is as disposing Charging system 2Y (below abbreviation Charging system 2Y or charged device 2Y) around the photoconductor drum 1Y of image forming; Exposure device 3Y; Developing apparatus 4Y; Cleaning device 5Y (following abbreviation cleaning device 5Y, or cleaning balde 5Y) forms yellow (Y) toner image on photoconductor drum 1Y.In addition, in the present embodiment, among this image formation unit 10Y, photoconductor drum 1Y, Charging system 2Y, developing apparatus 4Y, cleaning device 5Y are provided with becoming one at least.
Charging system 2Y is the device that photoconductor drum 1Y is given same current potential, and in the present embodiment, photoconductor drum 1Y adopts the charged device 2Y of corona discharge type.
Image exposing apparatus 3Y, it is to give by charged device 2Y on the photoconductor drum 1Y of same current potential, expose based on picture signal (yellow), formation is corresponding to the device of the electrostatic latent image of yellow image, as this exposure device 3Y, can adopt photoconductor drum 1Y axially by with the LED of array-like configuration light-emitting component and image-forming component (trade name: the exposure device of Gou Chenging セ Le Off オ ッ Network レ Application ズ), or employing laser optical system etc.
Ring-band shape intermediate transfer body unit 7, it has with a plurality of rollers reels, and as the ring-band shape intermediate transfer body 70 of the 2nd image-carrier of the semiconduction ring-band shape of rotatably supporting.
By each color image that image formation unit 10Y, 10M, 10C, 10Bk form, by primary transfer roller 5Y, 5M, 5C, the 5Bk as the primary transfer device, transfer printing successively on the ring-band shape intermediate transfer body 70 of rotation forms synthetic coloured image.The transfer materials P that in giving carton 20, deposits as transfer materials (load the support of final image of photographic fixing: for example common paper, slide etc.), by paper feeding device 21 paper feedings, pass through a plurality of intermediate calender rolls 22A, 22B, 22C, 22D, stop roller 23, be sent on the secondary transfer roller 5b as the secondary transfer printing device, secondary transfer printing on transfer materials P, whole transfer of color images once.Transfer printing the transfer materials P of coloured image, carry out photographic fixing by fixing device 24 and handle, efflux on the paper pallet 26 with the exit roller 25 clamping machines of being placed on.The transfer printing support unification of the toner image that forms is called offset medium here, on photoreceptors such as intermediate transfer body or transfer materials.
On the other hand, by the secondary transfer roller 5b as the secondary transfer printing device, after transfer of color images on the transfer materials P, the ring-band shape intermediate transfer body 70 of flex apart transfer materials P is removed residual toner by cleaning device 6b.
Primary transfer roller 5Bk always contacted with photoreceptor 1Bk during image formed and handles.Other primary transfer roller 5Y, 5M, 5C only when coloured image forms respectively with corresponding photoreceptor 1Y, 1M, 1C contact.
Secondary transfer roller 5b when only carrying out secondary transfer printing by transfer materials P here, contacts with ring-band shape intermediate transfer body 70.
In addition, can pull out basket 8 from device body A by supporting track 82L, 82R.
Basket 8 is made of image forming part 10Y, 10M, 10C, 10Bk and ring-band shape intermediate transfer body unit 7.
Image forming part 10Y, 10M, 10C, 10Bk dispose in the vertical direction file.At the diagram left side side of photoreceptor 1Y, 1M, 1C, 1Bk configuration ring-band shape intermediate transfer body unit 7.Ring-band shape intermediate transfer body unit 7 is made of take up roll 71,72,73,74 and rotatable ring-band shape intermediate transfer body 70, primary transfer roller 5Y, 5M, 5C, 5Bk and cleaning device 6b.
Following Fig. 3 is the formation sectional drawing that adopts the coloured image formation device (duplicating machine or the laser beam printer that have Charging system, exposure device, a plurality of developing apparatus, transfer device, cleaning device and intermediate transfer body at least at the periphery of Organophotoreceptor) of Organophotoreceptor of the present invention.Ring-band shape intermediate transfer body 70 uses the elastic body of moderate impedance.
The 1st, the rotation drum type photoreceptor as image forming uses repeatedly rotates driving in the counter clockwise direction that arrow is represented with predetermined circumference speed.
Photoreceptor 1 passes through Charging system (charged operation) 2 in rotary course, polarity current potential with regulation carries out the same charged processing, then, the image exposure that the light of the scan exposure that the laser beam of being modulated corresponding to the time series electricity digital pixel signal of image information by not shown image exposing apparatus (image exposure operation) 3 by acceptance produces etc. carries out forms the electrostatic latent image corresponding to yellow (Y) the color component image (colouring information) of purpose coloured image.
Secondly, this electrostatic latent image passes through yellow (Y) developing apparatus: developing procedure (yellow developer) 4Y, developed by the Yellow toner as the 1st look.At this moment, the the 2nd~the 4th developing apparatus (magenta developer, blue developer, black toner developer) 4M, 4C, 4Bk become out-of-operation state, do not act on the photoreceptor 1, the yellow toner image of above-mentioned the 1st look is not subjected to the influence of above-mentioned the 2nd~the 4th developer.
Intermediate transfer body 70 draws by roller 79a, 79b, 79c, 79d, 79e and establishes, in the clockwise direction, and to drive with the same peripheral speed rotation of photoreceptor 1.
Form and carry the yellow toner image that is held in above-mentioned the 1st look on the photoreceptor 1, in the process of the clamping part that passes through photoreceptor 1 and intermediate transfer body 70, the electric field that forms by the primary transfer bias voltage that applies to intermediate transfer body 70 from primary transfer roller 5a carries out intermediate transfer (primary transfer) successively at the outer peripheral face of intermediate transfer body 70.
The surface of the photoreceptor 1 that stops corresponding to the transfer printing of the yellow toner image of the 1st look of intermediate transfer body 70 is with cleaning device 6a cleaning.
Below, equally the overlapping transfer printing on intermediate transfer body 70 successively of the black toner image of the blue toner image of the pinkish red toner image of the 2nd look, the 3rd look, the 4th look, can form overlapping color toner image corresponding to the purpose coloured image.
By 2 transfer roll 5b, parallel corresponding to 2 transfer printing subtend roller 79b with bearing, in the state configuration of lower face leaving of intermediate transfer body 70.
Is reversed polarity from photoreceptor 1 to the toner image that is used for the 1st~the 4th look of the intermediate transfer body 70 primary transfer bias voltage and the toner of overlapping transfer printing successively, applies from grid bias power supply.This applies voltage, for example be+100V~+ scope of 2kV.
To the primary transfer operation of the toner image of the 1st of intermediate transfer body 70~the 3rd look, 2 transfer roll 5b and intermediate transfer body cleaning device 6b also separate with intermediate transfer body 70 from photoreceptor 1.
As the transfer printing on transfer materials P at the 2nd image-carrier of the overlapping color toner image of transfer printing on the banded intermediate transfer body 70, when 2 times transfer roll 5b contacts with the band of intermediate transfer body 70, stop roller 23 from a pair of paper feeding, by the transfer paper guide, being with of intermediate transfer body 70, transmit transfer materials P to the holder that contacts with 2 transfer roll 5b with official hour.2 transfer bias, be applied to 2 transfer roll 5b from grid bias power supply on.By these 2 transfer bias, from middle transfer article 70 to as the overlapping color toner image of the transfer materials P transfer printing of the 2nd image-carrier (2 transfer printings).The transfer materials P that stands the toner image transfer printing is imported to fixing device 24 and carries out heat fixer.
Image forming method of the present invention, generally be suitable for electrophotographic copier, laser printer, LED printer and the liquid crystal electro-photography apparatus such as fast gate-type printer that expose to the sun, in addition, also extensively adopt in the devices such as the display of applying electronic camera technique, record, light printing, plate-making and facsimile recorder.
[embodiment]
Enumerate embodiment below and explain the present invention, but the solution of the present invention is not limited to these.Also has " part " expression " mass parts " hereinafter.
The making of photoreceptor 1
Make the photoreceptor 1 of following manner.
Cut is carried out on the surface of cylindrical shape aluminum support, prepare the electric conductivity support of 10 surfaceness Rz=1.5 (μ m).
(middle layer)
Following middle layer dispersion liquid, be diluted to 2 times with same mixed solvent, leave standstill and filter after a night (filtrator: Japanese Port one Le society makes リ ジ メ ッ シ ュ 5 μ m filtrators), make the middle layer coating fluid.
Following ingredients is mixed, and as dispersion machine, batch (-type) carries out disperseing in 10 hours, makes the middle layer dispersion liquid with sand mill:
1 part of polyamide CM8000 (DongレShe manufacturing)
Inorganic particulate: 3 parts of titanium dioxide (number average primary particle size 35nm, the titanium dioxide that silica alumina is handled and the hydrogenated methyl polysiloxane was handled)
10 parts of methyl alcohol
Adopt above-mentioned coating fluid on above-mentioned support, to be coated with, and to make dry film thickness be 1.0 μ m.
(charge generating layer: CGL)
Titanyl phthalocyanine pigment (locating at the Bragg angle of the characteristic X-ray diffraction spectrum of Cu-K α (2 θ+0.2 °)) at least at 27.3 ° of titanyl phthalocyanine pigment with maximum diffraction peak
24 parts
Polyvinyl butyral resin " ェ ス レ Star Network BL-1 " (ponding chemistry society makes)
12 parts
Mix above-mentioned composition for 300 parts 2-butanone/cyclohexanone=4/1 (v/v), disperses preparation charge generating layer coating fluid with sand mill.Be coated with this coating fluid with the dip coated method, forming dry film thickness on above-mentioned middle layer is the charge generating layer of 0.5 μ m.
(charge transport layer 1 (CTL1))
The charge transport material (4,4 '-dimethyl-4 "-(α-styryl phenyl base) triphenylamine)
225 parts
300 parts of polycarbonate (Z300, the ガ ス of Mitsubishi chemistry society makes)
6 parts in antioxidant (the compd A O2-1 that enumerates)
2000 parts of methylene chloride
1 part of silicone oil (KF-54, chemistry society of SHIN-ETSU HANTOTAI makes)
They are mixed, dissolve, preparation charge transport layer coating fluid 1.On above-mentioned charge generating layer, be coated with this coating fluid with the dip coated method,, form the charge transport layer 1 of dry film thickness 18.0 μ m in 110 ℃ of dryings 70 minutes.
(charge transport layer 2 (CTL2))
The charge transport material (4,4 '-dimethyl-4 "-(α-styryl phenyl base) triphenylamine)
150 parts
Bonding agent: (segmented copolymer of above-mentioned block 1) 300 parts
12 parts in antioxidant (the compd A O2-1 that enumerates)
THF: 1200 parts of tetrahydrofurans
4 parts of silicone oil (chemistry society of KF-54 SHIN-ETSU HANTOTAI makes)
They are mixed, dissolve, preparation charge transport layer coating fluid 2.On above-mentioned charge transport layer 1, be coated with this coating fluid with circular sliding rebound type coating machine,, form the charge transport layer 2 of dry film thickness 2.0 μ m, make photoreceptor 1 in 110 ℃ of dryings 70 minutes.
The making of photoreceptor 2~14
Remove in the making of photoreceptor 1, the bonding agent kind of charge transport layer 2 (CTL2) is pressed outside table 2 change, operate equally, make photoreceptor 2~14 with photoreceptor 1.
The making of photoreceptor 15
Except the block 1 of the charge transport layer 2 that replaces photoreceptor 1 with following graft copolymer (GP1), other are operated equally, make photoreceptor 15.
[changing 7] graft polymer (GP1)
Figure A20061007147400291
The making of photoreceptor 16
Except using polycarbonate (Z) (Z-300, ガ ス chemical company of Mitsubishi makes) and dimethyl polysiloxane (KF-96, the manufacturing of chemical company of SHIN-ETSU HANTOTAI) beyond the block 1 of the charge transport layer 2 of (potpourri of 100 to 3 mass ratio) replacement photoreceptor 1, other and photoreceptor 1 are similarly made photoreceptor 16.
The measurement result of the site diameter of these photoreceptors 1~16 and microcell density is as shown in table 2.
[table 2]
Photoreceptor No. The bonding agent of CTL2 Site diameter (nm) Microcell density (per 1 * 10 4nm 2)
1 Block 1 5 9
2 Block 2 15 15
3 Block 3 30 20
4 Block 4 35 13
5 Block 5 15 14
6 Block 6 32 18
7 Block 7 30 12
8 Block 8 80 17
9 Block 9 60 13
10 Block 10 100 10
11 Block 11 0.8 125
12 Block 12 0.9 230
13 Block 13 0.8 200
14 Block 14 0.5 190
15 GP1 Do not form microcell Do not form microcell
16 The potpourri of polycarbonate and polysiloxane Do not form microcell Do not form microcell
In addition, contain the A-B segmented copolymer in each superficial layer that photoreceptor 1~14 uses, confirm by IR (infrared ray) spectral analysis.
" estimating 1 "
(real seal is estimated)
Above-mentioned photoreceptor is installed in commercially available full color compounding machine (Off Le カ ラ Yi Complex He Machine) 8050 (manufacturings of コ ニ カ ミ ノ Le PVC ジ ネ ス テ Network ノ ロ ジ one ズ (strain) society) that have Fig. 2 formation substantially, carries out the coloured image evaluation.
Appreciation condition
The linear speed of photoreceptor: 220mm/ second
" picture appraisal "
Various photoreceptors are installed on above-mentioned full color compounding machine (Off Le カ テ Yi Complex He Machine) 8050, in hot and humid (30 ℃, 80%RH) under the environment, carry out 10,000 with A4 paper and have character image, (ベ) image, the black duplicating of original image such as image, medium tone image on the spot in vain on the spot, take out copy image during beginning and during every duplicating 1 thousand sheets, carry out the following map evaluation.
Other conditions that image forms
Processing speed: 220mm/ second
Developer: adopt the tow-component developer (Y, M, C, Bk) that contains carrier and toner
The cleaning device of photoreceptor: the cleaning balde of caoutchouc elasticity is in (line loading: use under the contact conditions 18 (N/m)).
The cleaning device of intermediate transfer body: the cleaning balde that adopts caoutchouc elasticity.
The repeatability of the toner image on the photoreceptor (estimating) with the blue toner image.
Toner image on the photoreceptor is transferred on the transparent adhesive sheet and estimates.
◎: blank generation is considerably less, and dot image can clearly be reproduced (well)
Zero: little blank takes place, and dot image can be reproduced (can be practical)
*: blank generation is many, the shape of dot image break (can not be practical)
The repeatability of the toner image on the intermediate transfer body (estimating) with the blue toner image.
Toner image on the intermediate transfer body is transferred on the transparent adhesive sheet and estimates by this transferred image.
Zero: blank generation is considerably less, and dot image can clearly be reproduced (well)
△: little blank takes place, but dot image can be reproduced (can be practical)
*: blank generation is many, the shape of dot image break (can not be practical)
(spatter property)
After the above-mentioned evaluation, do not change cleaning doctor, only the line loading of the cleaning doctor of contact photoreceptor is changed to 9 (N/m) from 18 (N/m), carry out 10,000 duplicating more continuously, estimate spatter property.
◎:, do not have toner to release the bad generations (well) of spatter property such as (The り pull out け) fully by 10,000 printings
Zero: by 10,000 printings, the cleaning condition of poor that takes place that toner releases etc. and disperse, but on photoreceptor, do not see the toner membranization, no problem in the practicality (no problem in the practicality)
*: in 10,000 printings, it is bad that cleaning takes place (more than 2 or 2) continuously, or toner membranization on the photoreceptor (problem is arranged in the practicality)
Measurement of contact angle
To the contact angle of these photoreceptors 1~16, before and after above-mentioned 10,000 duplicate to be estimated (during beginning (St) and when finishing (End)) measure, the results are shown in table 3.Contact angle adopts said method to measure.
Evaluation result is shown in following table 3.
[table 3]
Contact angle (°) The repeatability of the toner image on the photoreceptor The repeatability of the sharp image of the toning on the intermediate transfer body Spatter property
St End
Photoreceptor 1 104 103
Photoreceptor 2 104 103
Photoreceptor 3 105 102
Photoreceptor 4 104 103
Photoreceptor 5 104 103
Photoreceptor 6 104 103
Photoreceptor 7 105 103
Photoreceptor 8 95 92
Photoreceptor 9 103 95
Photoreceptor 10 100 96
Photoreceptor 11 92 89
Photoreceptor 12 93 88
Photoreceptor 13 94 90
Photoreceptor 14 94 89
Photoreceptor 15 104 85 × ×
Photoreceptor 16 98 84 × ×
As known from Table 3, low-surface-energy composition in the adhesive resin forms the microcell that gathers, repeatability, the repeatability of the toner image on the intermediate transfer body and whole evaluations of spatter property with the toner image on the Organophotoreceptor of the present invention of superficial layer of island structure, all obtain good result, and in contrast, the photoreceptor that does not have the microcell that the low-surface-energy composition gathers at superficial layer produces many blank, the repeatability of the toner image on the intermediate transfer body worsens, and spatter property is also poor.
" estimating 2 "
Adopt photoreceptor No.3 and the No.15 shown in the table 4, be installed on commercially available chromatic printing machine magicolor2300 (manufacturing of コ ニ カ ミ ノ Le PVC ジ ネ ス テ Network ノ ロ ジ one ズ (strain) society) transformation apparatus of the formation that has Fig. 3 basically, estimate and estimate 1 same assessment item.
The results are shown in table 4.
[table 4]
Contact angle (°) The repeatability of the toner image on the photoreceptor The repeatability of the toner image on the intermediate transfer body Spatter property
Initial stage After duplicating 5 thousand sheets
Photoreceptor 3 105 103
Photoreceptor 15 104 85 × ×
As known from Table 4, the coloured image that adopts Organophotoreceptor No.3 of the present invention to make, the repeatability of the toner image on the repeatability of the toner image on the photoreceptor, the intermediate transfer body and spatter property whole all obtain good result.On the other hand, the coloured image that adopts Organophotoreceptor No.15 to make, the repeatability and the spatter property of the toner image on the intermediate transfer body are poor.
By adopting above-mentioned photoreceptor 1~14 or adopting their handle box, image forming method, image processing system, provide a kind of some sub-image that adopts semiconductor laser to form that makes to form high fine and closely woven dot image, and, toner is good to the transfer printing of offset medium from photoreceptor, can prevent the deterioration of blank and dot image, improve the electrophotographic image of spatter property.

Claims (10)

1. Organophotoreceptor, it is characterized in that, on the electric conductivity support, have in the Organophotoreceptor of photographic layer, the superficial layer of Organophotoreceptor comprises the segmented copolymer of have the matrix composition (A composition) and low-surface-energy composition (B composition), and has that low-surface-energy composition in this segmented copolymer gathers and the island structure that formed microcell.
2. according to the Organophotoreceptor described in the claim 1, wherein, the number average primary particle size of above-mentioned microcell is 1~100nm.
3. according to the Organophotoreceptor described in the claim 2, wherein, above-mentioned low-surface-energy composition is a polysiloxane.
4. according to the Organophotoreceptor described in the claim 1, wherein, the microcell density of above-mentioned superficial layer is per 1 * 10 4Nm 2It is 1~10000.
5. according to the Organophotoreceptor described in the claim 1, wherein, above-mentioned A composition is the copolymer in cinnamic acrylic ester composition.
6. according to the Organophotoreceptor described in the claim 1, wherein, above-mentioned segmented copolymer is the A-B segmented copolymer that an one end has low-surface-energy composition (B composition).
7. a handle box is characterized in that, this handle box is the handle box that is used for image processing system, and described image processing system has: Organophotoreceptor and make the charged Charging system of this Organophotoreceptor; The sub-image that forms electrostatic latent image on charged Organophotoreceptor forms device; Make this latent electrostatic image developing become the developing apparatus of toner image; The toner image of this development is transferred to transfer device on the offset medium from Organophotoreceptor; The cleaning device of after residual electric charge is removed on Organophotoreceptor after the toner image transfer printing neutralizer and this transfer printing, the toner that remains on the Organophotoreceptor being removed, wherein, the superficial layer of Organophotoreceptor comprises and has the segmented copolymer that contains matrix composition (A composition) and low-surface-energy composition (B composition), and the low-surface-energy composition that has in this segmented copolymer gathers, and the Organophotoreceptor of the island structure of formation microcell, and Charging system, sub-image forms device, developing apparatus, offset medium, at least a kind of device support in neutralizer and the cleaning device is an integral body, and can load and unload on the body that is installed in image processing system freely.
8. according to the handle box described in the claim 7, wherein, above-mentioned photoreceptor is any photoreceptor described in the claim 1~6.
9. an image processing system is characterized in that, this image processing system has: Organophotoreceptor and make the charged Charging system of this Organophotoreceptor; The sub-image that forms electrostatic latent image on charged Organophotoreceptor forms device; Making this latent electrostatic image developing is the developing apparatus of toner image; The cleaning device of residual toner on the Organophotoreceptor after the toner image of this development is transferred to offset medium on the offset medium, removes the neutralizer of the electric charge on the Organophotoreceptor after this transfer printing and removes transfer printing from Organophotoreceptor, wherein, use the superficial layer of Organophotoreceptor to comprise to have the matrix composition segmented copolymer of (A composition) and low-surface-energy composition (B composition), and the low-surface-energy composition that has in this segmented copolymer gathers, and has formed the Organophotoreceptor of the island structure of microcell.
10. according to the image processing system described in the claim 9, above-mentioned photoreceptor is any one described photoreceptor in the claim 1~6.
CN 200610071474 2005-05-25 2006-03-24 Organic photoreceptor, process cartridge, image forming method, and image forming apparatus Pending CN1869824A (en)

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