JP4642446B2 - Pattern forming method for conductive roller - Google Patents

Description

  The present invention relates to a technique for manufacturing a conductive roller used in an electrophotographic apparatus such as a copying machine or a printer, or an image forming apparatus such as an electrostatic recording apparatus. In particular, the surface quality of these conductive rollers is improved. Therefore, the present invention relates to a pattern forming method for a conductive roller in which a coating layer is formed by applying a paint to the surface of a base portion.

  In an electrophotographic image forming apparatus such as a copying machine or a printer, as a developing method for visualizing a latent image by supplying toner to a photosensitive drum or the like holding a latent image and attaching the toner to the latent image on the photosensitive drum. A pressure development method is known. In the pressure development method, for example, after the photosensitive drum is charged to a constant potential, an electrostatic latent image is formed on the photosensitive drum by an exposure machine, and a developing roller carrying toner is further attached to the electrostatic latent image. Development is performed such that the toner adheres to the latent image on the photosensitive drum. There has also been proposed a non-contact developing method in which a certain gap is provided between the photosensitive drum and the developing roller and toner is electrically ejected in the gap for development.

  In addition, the corona discharge method has been conventionally used for charging the photosensitive drum. However, in the corona discharge method, it is necessary to apply a high voltage of 6 to 10 kV, which is not preferable from the viewpoint of safety confirmation of the apparatus. Furthermore, since harmful substances such as ozone are generated during corona discharge, it is not preferable from the viewpoint of the environment. On the other hand, a contact charging method for charging the photosensitive drum has been proposed.

  Since the developing roller in the pressure development method and the charging roller in the contact charging method must rotate while securely holding the state in close contact with the photosensitive drum, also in the developing roller in the non-contact development method, In order to reduce the stress on the toner, silicone rubber, acrylonitrile-butadiene rubber (NBR), ethylene-propylene-diene rubber (EPDM), epichlorohydrin rubber (ECO) are provided on the outer periphery of the shaft made of a highly conductive material such as metal. In this structure, a semiconductive elastic body in which carbon black or metal powder is dispersed in an elastomer such as polyurethane and a semiconductive elastic layer made of a foam obtained by foaming these are formed. In addition, a resin coating layer may be further formed on the surface of the elastic layer for the purpose of controlling chargeability and adhesion to the toner and preventing contamination of the photosensitive drum by the elastic layer.

  Further, in addition to the developing roller and the charging roller, a toner supply roller for supplying toner to the developing roller, a transfer roller for transferring the toner adhering to the latent image of the photosensitive drum to the recording medium, and on the photosensitive drum after the transfer A conductive roller having a structure in which a semiconductive elastic layer is formed on the outer periphery of the shaft as described above, and a resin coating layer is further formed on the surface of the elastic layer, such as a cleaning roller for removing toner remaining on the surface Is used.

Conventionally, a conductive roller incorporated in an electrophotographic apparatus has been provided with minute irregularities on the surface in order to improve its charging performance and toner conveyance performance. In order to give irregularities to the surface of the conductive roller, surface roughness was formed by adding fine particles to the resin coating layer or polishing the surface of the resin coating layer (for example, Patent Document 1 and 2).
JP 2004-191561 A JP 2000-206783 A

  However, as disclosed in the above-mentioned patent document, when irregularities are formed on the surface of the conductive roller by adding fine particles to the resin coating layer, it is difficult to uniformly disperse the fine particles in the resin of the resin coating layer. It was. Therefore, as a means for forming the surface roughness without adding fine particles, a polishing means is provided on the surface, but since this is performed in a separate process, the number of processes tends to increase and become complicated. there were.

  Therefore, the present invention solves the problems in the conventional coating method of the conductive roller, makes the coating layer surface roughness of the conductive roller appropriate by a simple method, and transports the toner and charges. It is an object of the present invention to provide a pattern forming method for a conductive roller that can properly perform the above.

For this reason, the present invention presses a roller having a pattern made of fine irregularities on the surface of a conductive roller layer on which the coating is applied to the surface of the base portion to form an uncured coating layer layer. A pattern forming method for a conductive roller for forming a pattern, wherein the rotation shafts of the roller having the pattern and the conductive roller are arranged so as to intersect each other, and these are relatively moved in the axial direction of the conductive roller, the pattern is formed, characterized in Rukoto. Further, the present invention is characterized in that the surface of the coating layer of the conductive roller after the pattern formation is irradiated with ultraviolet rays or electron beams, and these are used as means for solving the problems.

According to the present invention, a roller having a pattern composed of fine irregularities is pressed against the surface of the coating layer on the surface of the conductive roller on which the coating is applied to the surface of the base portion to form an uncured coating layer. A pattern forming method for a conductive roller for forming a pattern, wherein the rotation shafts of the roller having the pattern and the conductive roller are arranged so as to intersect each other, and these are relatively moved in the axial direction of the conductive roller, the Rukoto the pattern is formed, a relatively smooth formed conductive roller coating composed of a resin is applied, is easily engraved pattern consisting of fine irregularities, moderate surface roughness As a result, optimization of the surface shape optimizes the amount of toner transport and charge, and is expected to improve the final output image quality. In addition, even with a roller having a small area pattern, the pattern can be engraved in a large area portion of the entire coating film layer of the conductive roller, so that the size of the roller having the uneven pattern can be reduced.

In addition , when the surface of the coating film layer of the conductive roller after the pattern formation is irradiated with ultraviolet rays or electron beams, the pattern appropriately engraved by the roller having an uneven pattern is fixed on the surface of the coating film layer for a long time. -It can be cured to maintain the toner transport amount and charge amount in an optimum state over a long period of time.

Hereinafter, a pattern forming method for a conductive roller according to the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment of a pattern forming method for a conductive roller according to the present invention. FIG. 1 (A) is a plan view of a state where a conductive roller is pressed by a concavo-convex forming roller, and FIG. 1A is a cross-sectional view taken along the line AA, FIG. 2 is a perspective view showing a second embodiment of the pattern forming method of the conductive roller of the present invention, and FIG. 3 is an enlarged view showing each example of the pattern of the unevenness forming roller. 4 and 4 are perspective views of each example of the conductive roller. As shown in FIG. 1, the basic structure of the conductive roller pattern forming method of the present invention is that of a conductive roller 1 in which a coating is applied to the surface of a base portion to form an uncured coating layer 4. A method of forming a pattern by pressing a roller 11 having a pattern of fine irregularities on the surface thereof against the surface of the coating film layer 4 to form a pattern, comprising the roller 11 having the pattern and the conductive roller 1. rotary shaft is arranged to cross, by which they are relatively moved in the axial direction of the conductive roller 1, wherein the pattern is formed, characterized in Rukoto. The pattern pressed on the conductive roller 1 is indicated by 1b.

  The first embodiment will be described below. FIG. 4 shows each example used as a conductive roller. These conductive rollers 1 and 2 require a certain degree of appropriate surface roughness. FIG. 4A shows an example of the elastic roller 1 in which an elastic base portion 5 is covered around a shaft 6 made of a hard solid rod-shaped body made of metal or synthetic resin. A coating film 4 is further coated around the base portion 5. FIG. 4B shows an example of a pipe-type roller 2 in which a thin elastic base portion 5 is coated around a pipe shaft 7 made of a hard tubular body made of metal or synthetic resin. A coating film 4 is further coated around the base portion 5.

  The elastic roller 1 in the conductive roller will be described as an example. Although not shown in the figure, the conductive elastic roller 1 that is the object to be coated is traversed in the axial direction while being rotated by a roller drive motor, and the surface of the base portion is coated by the coating roll of the roll coater. A layer is formed. If the traverse coating method is used in which the object to be coated and the coating roll move relative to each other in the axial direction of the object to be coated, the conductive material can be made conductive by the ring coater method, die coater method, spray coater method, etc. in addition to the roll coater method. Sex roller can be painted. Then, the process of pressing the concavo-convex forming roller 11 in a state where the coating layer is uncured is continuously performed.

  The axis of the concavo-convex forming roller 11 and the axis of the elastic roller 1 are arranged to intersect each other at a predetermined angle θ (θ can be changed), and are engraved on the surface of the concavo-convex forming roller 11 by surface contact between both rollers. The fine uneven pattern 11 b is pressed against the surface of the coating film layer 4 of the elastic roller 1 to form a fine uneven pattern 1 b on the surface of the coating film layer 4. If the angle θ is reduced, the pattern width can be increased. If allowed by design, the elastic roller 1 side may be configured to rotate only, disabling traverse movement, and the concavo-convex forming roller 11 side being configured to be traversable. As shown in FIG. 1B, which is a cross section taken along the line AA of FIG. 1A, the pressing device 10 is provided with a concavo-convex forming roller 11 pivotally supported in a frame body 12, A roll drive motor 14 that rotationally drives the roller 11 is provided.

  The pattern 11 b is formed by pressing on the peripheral surface of the coating film layer 4 of the conductive roller 1 by relative rotation between the conductive roller 1 and the concavo-convex forming roller 11 arranged so that the rotation axes intersect. At this time, unlike the above-described coating, the unevenness forming roller 11 has elasticity so that the engraving of the pattern 11b can be performed effectively, and the coating film layer 4 of the conductive roller 1 and the unevenness forming roller. 11 is configured to allow surface contact.

  Then, the unevenness forming roller 11 and the conductive roller 1 are relatively moved in the axial direction of the conductive roller 1 (in the illustrated example, the conductive roller 1 is traversed in the axial direction as indicated by an arrow A). Thus, the pattern 11 b is engraved on the entire area of the coating film layer 4 of the conductive roller 1. In the present embodiment, the pattern 11b can be formed on the large area of the entire area of the coating film layer 4 of the conductive roller 1 even with the small area pattern 11b engraved on the unevenness forming roller 11. The size of the roller 11 can be small. In addition, when the width | variety of the uneven | corrugated formation roller 11 is large, it is not necessary to carry out the traverse relative movement of the uneven | corrugated formation roller 11 and the electroconductive roll 1.

  In the present invention, the surface of the coating layer 4 of the conductive roller 1 on which the pattern 1b is pressed is further irradiated with UV or EB by ultraviolet (UV) irradiation means or electron beam (EB) irradiation means 18. Is. The pattern 1b appropriately engraved by the unevenness forming roller 11 can be fixed and cured on the surface of the coating layer 4 over a long period of time, and the toner transport amount and the charge amount can be maintained in an optimal state over a long period of time. Although the UV irradiation or the like may be performed by retracting the press apparatus 10 on which the unevenness forming roller 11 is installed, the UV irradiation means or the EB irradiation means 18 is provided side by side with the press apparatus 10 as in the illustrated example. These irradiations may be carried out simultaneously following the press. By such UV irradiation or EB irradiation, the press 1b is cured and fixed together with the paint uniformly and effectively without using a special solvent or the like for fixing the pressed pattern, so that an appropriate surface roughness can be obtained. Hold and improve quality.

  With the above configuration, an appropriate surface roughness can be imparted to the surface of the coating film layer 4 of the conductive roller 1 by a simple method called pressing, and the toner transport amount and the charge amount are optimized and output. The image quality can be improved. In addition, it is possible to optimize the surface shape by exchanging the pattern formed on the concave / convex forming roller, and to finely control the toner conveyance amount and the charge amount.

  FIG. 2 is a perspective view showing a second embodiment of the conductive roller pattern forming method of the present invention. In the present embodiment, the pattern 11b is pressed by a concavo-convex forming roller 11 having substantially the same shape as the conductive roller 1. The conductive roller 1 on which the coating film layer 4 is formed by an appropriate coating method such as the roll coater method, the die coater method, the spray coater method, or the ring coater method described above, and the length and diameter in the axial direction of the conductive roller 1 Are arranged in parallel with the concave-convex forming roller 11 formed substantially the same. A pattern 11 b is provided on the surface of the unevenness forming roller 11. In this embodiment, the pattern 1 b is pressed on the surface of the coating layer 4 of the conductive roller 1 that contacts the concavo-convex forming roller 11 by one rotation of the concavo-convex forming roller 11 on which the pattern 11 b is formed. Also in this embodiment, UV irradiation or the like is performed after pressing.

  FIG. 3 is an enlarged view showing each example of the pattern of the unevenness forming roller. Various examples of the pattern 11b formed on the surface of the unevenness forming roller 11 can be given. In addition to the basic hatching of the embodiment, (a) lattice type, (b) pyramid type, (c) diagonal line type, (d) turtle shell type, (e) TF type, etc. are adopted. obtain.

  The elastic layer of the conductive roller of the present invention includes an elastomer and a conductive agent, and includes other components such as a filler as necessary. Examples of the elastomer used for the elastic layer include silicone rubber, ethylene-propylene-diene rubber (EPDM), acrylonitrile-butadiene rubber (NBR), natural rubber, styrene-butadiene rubber (SBR), butyl rubber, chloroprene rubber, acrylic rubber, Examples include chlorohydrin rubber (ECO), ethylene-vinyl acetate copolymer (EVA), polyurethane, and mixtures thereof. Among these, silicone rubber, EPDM, ECO, and polyurethane are preferable. In the elastic layer, the elastomer may be used as a foam by chemically foaming the elastomer using a foaming agent, or mechanically entraining and foaming air like a polyurethane foam.

  The shaft and the elastic layer may be integrated using a reaction injection molding method (RIM molding method). That is, two types of liquids constituting the raw material component of the elastic layer can be mixed and injected into a cylindrical mold and reacted and cured to integrate the shaft and the elastic layer. Thereby, the time required from injection of raw materials to demolding can be shortened, and the production cost can be greatly reduced.

  When silicone rubber is used for the elastic layer, the silicone rubber may be general millable silicone rubber (HCR) or liquid silicone rubber (LSR). In addition, when using liquid silicone rubber, it is preferable to form an elastic layer by liquid injection molding (LIM: Liquid injection Molding). The above liquid silicone rubber contains vinyl group-containing polyorganosiloxane, organohydrogenpolysiloxane, reinforcing filler such as silica, conductive agent, platinum catalyst, reaction inhibitor, silicone oil, and other various additives. After being mixed and injected into a mold having a predetermined shape, it is molded by heat curing.

（式１中、Ｒ¹ は、それぞれ独立して一価の炭化水素基であり、ｎは１００〜１００００の整数である）で表される化合物が好ましい。ここで、Ｒ¹ における一価の炭化水素基としては、メチル基、エチル基、プロピル基、ブチル基およびペンチル基等のアルキル基、ビニル基およびアリル基等のアルケニル基、シクロヘキシル基等のシクロアルキル基、フェニル基等のアリール基、ベンジル等のアラルキル基等が挙げられる。 The vinyl group-containing polyorganosiloxane has two or more reactive groups in the molecule, and examples of the reactive groups include alkenyl groups and hydroxyl groups. As the vinyl group-containing polyorganosiloxane, the following formula 1

(In formula 1, each R ¹ is independently a monovalent hydrocarbon group, and n is an integer of 100 to 10,000). Here, as the monovalent hydrocarbon group in R ¹ , an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group and a pentyl group, an alkenyl group such as a vinyl group and an allyl group, and a cycloalkyl group such as a cyclohexyl group Group, an aryl group such as a phenyl group, and an aralkyl group such as benzyl.

（式２中、Ｒ² は、それぞれ独立して水素または一価の炭化水素基であり、ｍは１０〜１０００の整数である）で表され、分子中に２個以上の珪素−水素結合を有する化合物が好ましい。ここで、Ｒ² おける一価の炭化水素基としては、メチル基、エチル基、プロピル基、ブチル基およびペンチル基等のアルキル基、ビニル基およびアリル基等のアルケニル基、シクロヘキシル基等のシクロアルキル基、フェニル基等のアリール基、ベンジル等のアラルキル基等が挙げられる。 Moreover, as said organohydrogen polysiloxane, following formula 2 is shown.

(In Formula 2, each R ² is independently hydrogen or a monovalent hydrocarbon group, m is an integer of 10 to 1000), and two or more silicon-hydrogen bonds are formed in the molecule. The compound which has is preferable. Here, examples of the monovalent hydrocarbon group in R ² include alkyl groups such as methyl group, ethyl group, propyl group, butyl group and pentyl group, alkenyl groups such as vinyl group and allyl group, and cycloalkyl groups such as cyclohexyl group. Group, an aryl group such as a phenyl group, and an aralkyl group such as benzyl.

  Moreover, as a electrically conductive agent contained in liquid silicone rubber, the electrically conductive agent generally used for the elastic layer mentioned later can be used. Examples of the platinum-based catalyst include platinous chloride, chloroplatinic acid, alcohol-modified platinum chloride, and the like, and examples of the reaction inhibitor include methylvinylcyclotetrasiloxane, acetylene alcohols, siloxane-modified acetylene alcohol, and hydroperoxide. Can be mentioned.

  Examples of the conductive agent used for the elastic layer include an electronic conductive agent and an ionic conductive agent. Electronic conductive agents include conductive carbon such as ketjen black and acetylene black, carbon black for rubber such as SAF, ISAF, HAF, FEF, GPF, SRF, FT and MT, and carbon black for color subjected to oxidation treatment. , Pyrolytic carbon black, natural graphite, artificial graphite, antimony-doped tin oxide, ITO, tin oxide, titanium oxide, zinc oxide and other metal compounds, nickel, copper, silver, germanium and other metals, polyaniline, polyvinyl, polyacetylene, etc. And conductive whiskers such as carbon whisker, graphite whisker, titanium carbide whisker, conductive potassium titanate whisker, conductive barium titanate whisker, conductive titanium oxide whisker, and conductive zinc oxide whisker. The blending amount of the electronic conductive agent is preferably in the range of 1 to 50 parts by mass, more preferably in the range of 5 to 40 parts by mass with respect to 100 parts by mass of the elastomer.

  Examples of the ionic conductive agent include tetraethylammonium, tetrabutylammonium, dodecyltrimethylammonium, hexadecyltrimethylammonium, benzyltrimethylammonium, denatured fatty acid dimethylethylammonium, and other perchlorates, chlorates, hydrochlorides, bromates Of ammonium salts such as salt, iodate, borofluoride, sulfate, ethyl sulfate, carboxylate and sulfonate, alkali metals such as lithium, sodium, potassium, calcium and magnesium, alkaline earth metals Examples include perchlorate, chlorate, hydrochloride, bromate, iodate, borofluoride, sulfate, trifluoromethyl sulfate, and sulfonate. The compounding amount of the ionic conductive agent is preferably in the range of 0.01 to 10 parts by mass, more preferably in the range of 0.05 to 5 parts by mass with respect to 100 parts by mass of the elastomer. The said electrically conductive agent may be used individually by 1 type, may be used in combination of 2 or more type, and may combine an electronic conductive agent and an ionic conductive agent.

The elastic layer preferably has a resistance value of 10 ³ to 10 ¹⁰ Ωcm, preferably 10 ⁴ to 10 ⁸ Ωcm, depending on the blending of the conductive agent. If the resistance value of the elastic layer is less than 10 ³ Ωcm, the charge may leak to the photosensitive drum or the like, or the conductive roller itself may be broken by voltage, and if it exceeds 10 ¹⁰ Ωcm, the ground cover tends to occur.

  The elastic layer may contain a crosslinking agent such as an organic peroxide and a vulcanizing agent such as sulfur in order to make the elastomer into a rubbery material as necessary. You may contain an acceleration | stimulation adjuvant, a vulcanization retarder, etc. The elastic layer further comprises a rubber compounding agent such as a filler, a peptizer, a foaming agent, a plasticizer, a softener, a tackifier, an anti-tacking agent, a separating agent, a release agent, an extender, and a colorant. It may contain.

  In addition, when the elastic layer is formed using polyurethane or EPDM as a base material, various charge control agents such as nigrosine, triaminophenylmethane, and cationic dyes, silicone resin, and silicone rubber are used to control the toner charge amount on the surface. Fine powders such as nylon may be added. Here, the addition amount of the charge control agent is preferably in the range of 1 to 5 parts by mass with respect to 100 parts by mass of the polyurethane or EPDM, and the addition amount of the fine powder is 1 to 100 parts by mass of the polyurethane or EPDM. A range of 10 parts by weight is preferred.

  The hardness of the elastic layer is not particularly limited, but is preferably 80 degrees or less in terms of Asker C hardness, and more preferably 20 to 70 degrees. When the Asker C hardness of the elastic layer exceeds 80, the contact area between the conductive roller and the photosensitive drum becomes small, and there is a possibility that good development cannot be performed. Also, when the conductive roller is used as a developing roller In addition, the toner is damaged, and the toner adheres to the photosensitive drum or the stratified blade. On the other hand, if the elastic layer is too low, when a conductive roller is used as the developing roller, the frictional force with the photosensitive drum or the stratified blade increases, and there is a possibility that image deficiency such as jitter may occur. Since the elastic layer is used in contact with a photosensitive drum, a stratified blade, etc., even when the hardness is set to a low hardness, it is preferable to reduce the compression set as much as possible, specifically 20% or less. It is preferable that

  As described above, by applying ultraviolet (EV) irradiation or electron beam (EB) irradiation to the surface of the conductive roller 1 or the like after coating and pressing, the coating layer 4 and the pattern 11b can be dried and cured appropriately and quickly. In order to fix, it is necessary to make the coating material from an ultraviolet curable resin or an electron beam curable resin.

  For the resin coating layer of the present invention, ultraviolet rays or electron beam curable resins and / or compounds are preferably used, but may contain non-ultraviolet rays or non-electron beam curable resins. The coating liquid preferably contains a reactive diluent, a conductive agent, a photopolymerization initiator, and a photopolymerization accelerator, and may contain other known additives as required, and does not contain a solvent. Is preferred.

  Examples of the ultraviolet or electron beam curable resin used for the resin coating layer include polyester resin, polyether resin, fluorine resin, epoxy resin, amino resin, polyamide resin, acrylic resin, acrylic urethane resin, urethane resin, alkyd resin, and phenol resin. Melamine resin, urea resin, silicone resin, polyvinyl butyral resin, vinyl ether resin, vinyl ester resin, and modified resins having a specific functional group introduced into these resins. You may mix and use a seed | species or more. Moreover, it is preferable to introduce a crosslinked structure into the resin coating layer in order to improve the mechanical strength and the circulation resistance.

  The ultraviolet ray or electron beam curable resin is a resin and / or compound polymerizable by ultraviolet ray or electron beam, preferably a resin and / or compound having a carbon-carbon double bond polymerizable by ultraviolet ray or electron beam. Or it hardens | cures by electron beam irradiation. The resin and / or compound that can be polymerized by ultraviolet rays or electron beams are preferably (meth) acrylate monomers and oligomers. Here, as the (meth) acrylate monomer and oligomer, urethane (meth) acrylate, epoxy (meth) acrylate, ether (meth) acrylate, ester (meth) acrylate, polycarbonate (meth) acrylate, and silicone Monomers and oligomers such as (meth) acrylates may be mentioned.

  Various additives such as a reactive diluent having a polymerizable double bond and a conductive agent may be further blended in the coating liquid used for forming the resin coating layer, if necessary. By blending a reactive diluent having a polymerizable double bond into the coating solution, the viscosity of the coating solution can be adjusted. As the reactive diluent, a monofunctional, bifunctional or polyfunctional polymerizable compound having a structure in which (meth) acrylic acid is bonded to a compound containing an amino acid or a hydroxyl group by an esterification reaction or an amidation reaction is used. Can do. The distribution amount of the reactive diluent is preferably in the range of 10 to 200 parts by mass with respect to 100 parts by mass in total of the resin and compound polymerizable by the ultraviolet rays.

Moreover, as a electrically conductive agent used for the said coating liquid, the thing similar to what was illustrated as said electrically conductive agent for elastic layers can be illustrated. Among these, a carbon-type electronic conductive agent, an ionic conductive agent, and a transparent conductive agent are preferable.

  It is preferable to mix a photopolymerization initiator in the coating solution used for forming the resin coating layer. Known photopolymerization initiators can be used. For example, 4-dimethylaminobenzoic acid, 4-dimethylaminobenzoic acid ester, 2,2-dimethoxy-2-phenylacetophenone, acetophenone diethyl ketal, alkoxyacetophenone, benzyldimethyl ketal, benzophenone and 3,3-dimethyl-4-methoxy Benzophenone derivatives such as benzophenone, 4,4-dimethoxybenzophenone, 4,4-diaminobenzophenone, alkyl benzoylbenzoate, bis (4-dialkylaminophenyl) ketone, benzyl derivatives such as benzyl and benzylmethyl ketal, benzoin and benzoin isobutyl ether Benzoin derivatives such as benzoin isopropyl ether, 2-hydroxy-2-methylpropiophenone, 1-hydroxycyclohexylphenyl Ton, xanthone, thioxanthone and thioxanthone derivatives, fluorene, 2,4,6 trimethylbenzoyl diphenylphosphine oxide, bis (2,6-dimethoxybenzoyl) -2,4.4-trimethylpentylphosphine oxide, bis (2,4,4 66-trimethylylbenzoyl) phenylphosphine oxide, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropane-1,2-benzyl-2-dimethylamino-1- (morpholinophenyl) ) -Butane-1 and the like. These photoinitiators may be used individually by 1 type, and may use 2 or more types together.

  When a photopolymerization initiator is blended in the coating liquid used to form the resin coating layer, a tertiary amine photopolymerization accelerator such as triethylamine or triethanolamine is used to accelerate the polymerization reaction by the photopolymerization initiator. Phosphine-based photopolymerization accelerators such as triphenylphosphine. A thioether photopolymerization accelerator such as thiodiglycol may be further added. The addition amount of these photopolymerization accelerators is preferably in the range of 0.01 to 10 parts by mass with respect to 100 parts by mass in total of the resin and compound polymerizable by ultraviolet rays.

  The thickness of the resin coating layer is more preferably in the range of 1 to 100 μm, and still more preferably in the range of 5 to 100 μm. When the thickness of the resin coating layer is less than 1 μm, the electrical performance of the surface of the roller or the like may not be sufficiently ensured due to friction during long-term use. When the thickness exceeds 100 μm, the surface becomes hard and damages the toner. In some cases, the toner adheres to the photosensitive drum to cause image defects.

  As a coating method employed in the coating process prior to the press of the present invention, a die coater coating method, a ring coater coating method, a spray coater coating method, or the like is employed in addition to the coating by the roll coater described in the embodiments. The die coater coating method is a method in which the surface of the base portion 5 of the rotating conductive roller 1 is coated with a paint sprayed linearly from the gap between the upper and lower die heads arranged adjacent to the conductive roller 1. It is. The die head is traversed along the axis of the conductive roller 1. In the ring coater coating method, the surface of the base portion 5 of the rotating conductive roller 1 is coated with a paint sprayed in a ring shape from the gap between the annular upper and lower die heads arranged around the conductive roller 1. Is. The conductive roller 1 is applied to the stationary die head while being drawn upward. In the spray coater coating method, the surface of the base portion 5 of the conductive roller 1 that rotates while traversing is coated with paint that is radially ejected from a spray that is disposed alongside the conductive roller 1.

  The embodiments of the present invention have been described above, but within the scope of the present invention, the types of conductive rollers (charging roller, developing roller), shapes including layered forms, and types (elastic rollers, pipe-type rollers) , Coating form (preferably the conductive roller side, which is the object to be coated, is axially moved, but the coating roll side such as a roll coater may be axially moved), the shape and form of the irregularity forming roller (to the press device) ), Pattern shape, type, rotational form of conductive roller, traverse and form of actuator for rotational drive (electrical) , Types of drive sources such as fluid and magnetism, rack and pinion, piston and cylinder, etc.), conductive roller fixed form to base shaft or pipe shaft, base material and conductivity Addition form such as content of UV, addition form such as content of UV curable resin or electron beam curable resin to paint, type of traverse coating method (preferably roll coater is adopted, die coater In addition, a ring coater or a spray coater can also be employed), and the shape and form of the ultraviolet or electron beam irradiation means, its installation form, and the like can be selected as appropriate.

FIG. 1A shows a first embodiment of a conductive roller pattern forming method according to the present invention. FIG. 1A is a plan view of a state where a conductive roller is pressed by a concavo-convex forming roller, and FIG. It is AA sectional drawing of A). It is a perspective view which shows 2nd Example of the pattern formation method of the conductive roller of this invention. It is an enlarged view which shows each example of the pattern of the roller for uneven | corrugated formation of this invention. It is a perspective view of each example of a conductive roller.

Explanation of symbols

1 Conductive roller (elastic roller)
DESCRIPTION OF SYMBOLS 1b Pressed pattern 4 Coating layer 10 Pressing device 11 Concavity and convexity forming roller 11b Pattern 14 Roll drive motor 18 UV irradiation means (or EB irradiation means)

Claims (2)

Conductivity that forms a pattern by pressing a roller having a pattern with fine irregularities on the surface of a conductive roller on which the coating is applied to the surface of the substrate and an uncured coating layer is formed . a pattern forming method of the rollers, the rotation axes of the rollers and the conductive rollers having the pattern is arranged to cross, by which they are relatively moved in the axial direction of the conductive roller, the pattern Ru is formed A pattern forming method for a conductive roller. 2. The pattern forming method for a conductive roller according to claim 1, wherein the surface of the coating layer of the conductive roller after the pattern formation is irradiated with ultraviolet rays or an electron beam.

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