JP4257462B2 - Office equipment components - Google Patents

Description

【００４０】
表１に示した結果から明らかなように、本発明の事務機器用部材である実施例１〜３の中間転写ベルトは、抵抗調整性、抵抗の環境依存性、感光体汚染性、トナー付着性、摩擦特性に優れており、更に屈曲に対する耐久性が著しく優れていることが確認された。
【図面の簡単な説明】
【図１】中間転写方式による画像形成装置の一例を示す概略図である。
【図２】中間転写方式による画像形成装置の他の例を示す概略図である。
【図３】本発明にかかる事務機器用部材（ドラム状中間転写部材）の一例を示す概略断面図である。
【図４】本発明にかかる事務機器用部材（ベルト状中間転写部材）の一例を示す部分概略断面図である。
【符号の説明】
１ 感光体
２ 一次帯電器
３ 画像露光
９ 給紙カセット
１４ クリーニング装置
１５ 定着器
２０ａ 中間転写部材（ドラム状）
２０ｂ 中間転写部材（ベルト状）
２４ 記録媒体
２５ 転写ローラ
２９ バイアス電源
３５ 中間転写部材のクリーニング装置
４１ マゼンタ色現像装置
４２ シアン色現像装置
４３ イエロー色現像装置
４４ ブラック色現像装置
６１ バイアス電源
２００ 基体
２０１ 導電性ゴム層
２０２ 被覆層[0001]
BACKGROUND OF THE INVENTION
The present invention relates to belts, rollers, drums, blades used in office equipment such as electrophotographic apparatuses such as copying machines, facsimiles, laser printers, or ink jet printers, toner jet printers, thermal transfer printers, thermal sublimation printers, impact printers, etc. And so on.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, office machines such as copiers, facsimiles, printers, etc. have belts, rollers, etc. for performing charging, development, transfer, intermediate transfer, toner layer formation, toner conveyance, toner stirring, cleaning, fixing, paper conveyance, etc. Various members such as drums and blades are used, and in many cases, softness is required for these members. Therefore, a rubber-like or foam-like elastic body is used alone, or a metal or fibrous material is used. It is used by being laminated or composited with a resin molded body or the like.
[0003]
These office equipment members depend on the application, etc., but the rubber-like elastic bodies and foams are used for preventing contamination of the photoreceptor, toner adhesion prevention, toner charging control, resistance adjustment, friction coefficient control, and the like. In many cases, a film made of resin is formed on the surface of the elastic body.
[0004]
However, the resin that forms the film is much harder than rubber-like elastic bodies and foam-like elastic bodies, and is less likely to follow deformation of the elastic body, so that the film tends to crack, and as a result Therefore, the compounding agent from rubber or the like oozes out, toner adheres to the cracks, or the friction coefficient changes, so that the initial purpose cannot be achieved at an early stage. In particular, belt-shaped, drum-shaped, and roller-shaped members often require large elastic deformation as compared to other forms of members, and the life of the surface film is a problem.
[0005]
In this case, as a resin for forming the surface film, some urethane resins can follow the elastic deformation of rubber, and it has been proposed to form a film using such a urethane resin. Since the resistance of the urethane resin varies greatly depending on the environment, there is a problem that the environmental dependency of the resistance of the obtained member is increased.
[0006]
The present invention has been made in view of the above circumstances. In an elastic member used in office equipment such as a copying machine, a facsimile machine, and a printer, the elastic member can well follow the elastic deformation of the elastic body, has a long life, and has a resistance. It is an object of the present invention to provide a member for office equipment having a coating film on the surface, which is less dependent on the environment and can easily adjust the resistance value.
[0007]
As a result of intensive studies to achieve the above object, the present inventor has good resistance to the environment dependency of resistance and can sufficiently follow elastic deformation of rubber and the like by using polyolefin urethane resin. Based on this finding, a member having a film made of a polyolefin-based urethane resin was previously proposed (Japanese Patent Application No. 9-154447). However, according to the knowledge of the present inventor, since the above-mentioned polyolefin-based urethane resin has a higher resistance value than a general urethane resin, a coating layer composed of a film of this polyolefin-based urethane resin is formed on the surface of the member to provide resistance. When the value is to be adjusted, the resistance value of the member greatly fluctuates due to a minute thickness variation of the coating layer, and it is difficult to stably manufacture a member having a certain resistance value. In order to obtain a value, it has been found that a great deal of labor is required to manage the thickness of the coating layer when it is formed.
[0008]
Therefore, as a result of further investigation, the inventor of the present invention uses a combination of two or more polyisocyanate compounds as a curing agent with respect to the polyolefin-based polyol main material, thereby combining the polyisocyanate and the mixing ratio thereof. The volume resistivity can be reliably adjusted in the range of 10 ¹³ to 10 ¹⁶ Ω · cm, and by forming a coating layer on the surface of the member using this urethane resin, the coating layer on the surface is elastic of the elastic body. It has excellent durability that can maintain good performance for a long time without causing cracks in the coating layer by following the deformation well, and it has less environmental dependency of resistance and always exhibits stable performance. In addition, it has been found that a resistance value can be easily controlled at the time of manufacture, and a product having a certain performance can be obtained reliably and stably. It has been completed.
[0009]
Therefore, the present invention has a coating layer on the surface, the coating layer is mainly composed of a polyolefin-based polyol, uses two or more polyisocyanate compounds as a curing agent, and at least one of them is a fat. Is a polyisocyanate compound selected from aliphatic isocyanates, alicyclic isocyanates and derivatives thereof, and is formed of a urethane resin having a volume resistivity adjusted to 10 ¹³ to 10 ¹⁶ Ω · cm, or a composition containing the urethane resin. A member for office equipment is provided.
[0010]
Hereinafter, the present invention will be described in more detail.
As described above, the member for office equipment according to the present invention has a coating layer formed on the surface with a film using a urethane resin in which two or more kinds of polyisocyanate compounds are blended as a curing agent to the polyolefin polyol of the main material. is there.
[0011]
Here, the polyolefin-based polyol is a diene monomer polymer or copolymer and a hydrogenated product thereof having a hydroxyl group in a molecular terminal or molecular chain. Specifically, polybutadiene polyol, polyisoprene polyol, poly (butadiene-acrylonitrile) polyol, poly (butadiene-isoprene) polyol, poly (butadiene-styrene) polyol, hydrogenated polybutadiene polyol, hydrogenated polyisoprene polyol, hydrogenated poly (Butadiene-isoprene) polyol can be exemplified. Among these, various hydrogenated polyols are particularly preferably used because they exhibit good durability against ozone and nitrogen oxides generated in electrophotographic apparatuses such as copying machines and printers. In addition, when using a non-hydrogenated polyol, it is not particularly limited, but it is preferable to add an anti-aging agent and an ozone deterioration preventing agent, in this case as an anti-aging agent and an ozone deterioration preventing agent Those known for rubber can be suitably used, and the amount added can be about 0.05 to 3 parts by weight per 100 parts by weight of polyolefin polyol.
[0012]
Next, the polyisocyanate compound added as a curing agent to the polyolefin-based polyol is a compound having two or more isocyanate groups in the molecule, and is similar to the polyisocyanate generally used as a polyurethane raw material. Things can be used. Specifically, tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), naphthalene diisocyanate (NDI), tolidine diisocyanate (TODI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), phenylene diisocyanate, xylylene diisocyanate ( XDI), tetramethylxylylene diisocyanate (TMXDI), cyclohexane diisocyanate, lysine ester triisocyanate, undecane triisocyanate, hexamethylene triisocyanate, triphenylmethane triisocyanate, and polymers, derivatives, modified products, hydrogenated products of these isocyanate compounds Examples include the body. Among these, aliphatic or alicyclic isocyanates such as hexamethylene diisocyanate and isophorone diisocyanate, and polymers, derivatives and modified products thereof are particularly preferably used because they are excellent in ozone resistance and heat resistance.
[0013]
Further, a material obtained by modifying the polyisocyanate compound with a hydrophilic substance having a low molecular weight or a high molecular weight to impart hydrophilicity is also preferably used. For example, urethane modification with polyols of monomers such as ethylene glycol (EG), 1,4-butane glycol (1,4-BD), trimethylolpropane (TMP), polymer polyols such as polyether polyol and polyester polyol The polyisocyanate compound of the body or adduct body can be suitably used as a curing agent, whereby the resistance of the polyolefin-based urethane resin can be lowered.
[0014]
In the present invention, two or more of the above polyisocyanate compounds are used in combination, and the volume resistivity of the urethane resin is adjusted to 10 ¹³ to 10 ¹⁶ Ω · cm by appropriately selecting the combination and blending ratio. . In this case, the blending ratio is appropriately selected according to the type and number of polyisocyanate compounds to be combined, and is not particularly limited. For example, when combining two types, the effect of the combination can be reliably obtained. Is preferably in the range of 1/9 to 9/1, particularly 2/8 to 8/2, more preferably 3/7 to 7/3.
[0015]
The member for office equipment according to the present invention has a coating layer formed on the surface using the above-mentioned polyolefin-based urethane resin. In this case, the coating layer can be formed using only the above-mentioned polyolefin-based urethane resin. Usually, various additives are blended using this polyolefin-based urethane resin as a binder. For example, other urethane resins, fluororesins, polyamides, polyesters, alkyd resins, melamine resins for the purpose of further reducing friction coefficient and tackiness, reducing surface energy, or adjusting charging behavior and capacitance. , Phenolic resin, epoxy resin, acrylic resin, acrylic silicone resin, acrylic urethane resin, silicone resin, amino resin, urea resin, chlorinated polyethylene, ethylene vinyl acetate resin, ethylene ethyl acrylate resin, polyvinyl butyral resin, Carbon, metal powder, metal oxides, conductive agents such as ionic substances, inorganic resin fine powders such as fluororesin fine particles, silicone fine particles, molybdenum sulfide and graphite, and other lubricants, etc. An appropriate amount can be added.
[0016]
The formation of the coating layer may be carried out by any method and is not particularly limited. Usually, the polyolefin polyol, the two or more polyisocyanate compounds, and other additives are appropriately added. A method in which it is dissolved or dispersed in a solvent, applied to the surface of a member by a dipping method, a roll coater method, a doctor blade method, a spray method or the like, and dried at room temperature or under heating at about 50 to 170 ° C. Are preferably used. In this case, the solvent is not particularly limited, but alcohol solvents such as methanol, ethanol, isopropanol and butanol, ketone solvents such as acetone, methyl ethyl ketone and cyclohexanone, and aromatic hydrocarbons such as toluene and xylene. Solvents, aliphatic hydrocarbon solvents such as hexane, alicyclic hydrocarbon solvents such as cyclohexane, ester solvents such as ethyl acetate, ether solvents such as isopropyl ether and tetrahydrofuran, and amides such as dimethylsulfamide. Solvents, halogenated hydrocarbon solvents such as chloroform and dichloroethane, and mixed solvents thereof are preferably used.
[0017]
The thickness of the coating layer is appropriately set according to the type, use, size, and the like of the member, and is not particularly limited, but is usually 1 to 200 μm, preferably 3 to 100 μm, and the thickness is preferably When the thickness is less than 1 μm, the effect of providing the coating layer may not be sufficiently obtained. On the other hand, when the thickness exceeds 200 μm, the coating layer may become hard and the elasticity of the member may be impaired.
[0018]
The member for office equipment according to the present invention has the coating layer formed on the surface, and the main body portion of the member forming the coating layer may be any one, but the coating layer is formed on the elastic body surface. In particular, it is preferable to form the coating layer on the conductive rubber layer of a member having a conductive rubber layer to form a member for office equipment, whereby the effect of the present invention is remarkably achieved. It is obtained.
[0019]
There is no restriction | limiting in particular as said electroconductive rubber layer, The rubber elastic body which added the electrically conductive agent to the appropriate rubber material, and provided electroconductivity can be used. In this case, specific examples of the rubber material include nitrile rubber, ethylene propylene rubber, styrene butadiene rubber, butadiene rubber, isoprene rubber, natural rubber, silicone rubber, urethane rubber, acrylic rubber, chloroprene rubber, butyl rubber, and epichlorohydrin rubber. One or two or more of these mixed rubbers can be used, particularly nitrile rubber, urethane rubber, acrylic rubber, epichlorohydrin rubber, and blend rubbers of these with other rubber materials such as ethylene propylene rubber However, it is preferably used because it is excellent in adhesiveness with the polyolefin urethane resin of the coating layer.
[0020]
Moreover, as a conductive agent added to the conductive rubber layer, a known ionic conductive agent or electronic conductive agent can be used. Specific examples of ionic conductive agents include perchlorine such as tetraethylammonium, tetrabutylammonium, lauryltrimethylammonium, stearyltrimethylammonium, octadecyltrimethylammonium, dodecyltrimethylammonium, hexadecyltrimethylammonium, benzyltrimethylammonium, and modified fatty acid dimethylethylammonium. Acid salts, chlorates, hydrochlorides, bromates, iodates, borofluorides, sulfates, ethyl sulfates, carboxylates, sulfonates, ammonium salts, lithium, sodium, calcium, magnesium Alkali metal or alkaline earth metal perchlorate, chlorate, hydrochloride, bromate, iodate, borofluoride, trifluoromethyl sulfate, sulfonate, etc. And the like. Specific examples of the electronic conductive agent include conductive carbon such as ketjen black and acetylene black, carbon for rubber such as SAF, ISAF, HAF, FEF, GPF, SRF, FT, and MT, and an ink subjected to oxidation treatment. Examples include carbon, pyrolytic carbon, graphite, conductive metal oxides such as tin oxide, titanium oxide, and zinc oxide, and metals such as nickel and copper.
[0021]
The addition amount of these conductive agents is not particularly limited, but the ionic conductive agent is about 0.01 to 5 parts by weight, particularly about 0.05 to 2 parts by weight with respect to 100 parts by weight of the rubber component. In addition, the electronic conductive agent may be 1 to 50 parts by weight, particularly about 5 to 40 parts by weight, based on 100 parts by weight of the rubber component. Although depending on the use of the member, it is usually preferable to adjust the resistance value of the conductive rubber layer to 10 ³ to 10 ⁹ Ω · cm, particularly 10 ⁴ to 10 ⁸ Ω · cm by adding this conductive agent.
[0022]
In addition to the conductive agent, various additives can be added to the conductive rubber layer depending on the characteristics required of the member, such as a crosslinking agent, a reinforcing material, a filler, a foaming agent, and a plasticizer. Softeners, colorants, fillers, etc. can be added.
[0023]
The member for office equipment of the present invention has the coating layer on the surface, and in particular, the coating layer is formed on the conductive rubber layer. In this case, various materials such as belts, rollers, drums, and blades can be formed by molding the conductive rubber material or other materials into a desired shape according to the application. Accordingly, a member for office equipment can be formed by laminating or combining the conductive rubber material or the like with a metal, a fibrous material, a resin molded body, or the like. For example, when a drum-shaped or roller-shaped member is used, the conductive rubber layer may be formed on a drum-shaped or roller-shaped core made of metal or a resin molded body to constitute a member for office equipment. In the case of a belt shape or a blade shape, the conductive rubber layer can be reinforced to form a belt shape or a blade shape by laminating or embedding a reinforcing layer.
[0024]
As the reinforcing layer, a resin reinforcing layer and / or a fiber layer can be formed. Examples of the resin reinforcing layer include known thermoplastic resins, thermoplastic elastomers, thermosetting resins, and the like. Specifically, polycarbonate resins, polyester resins, polyamide resins, polyimide resins, polyurethane resins, polyether resins And resins such as polyvinyl resins, polyvinylidene resins, polyether ether ketone resins, and polysulfone resins. In this case, the resin reinforcing layer may be formed by laminating a plurality of the above-described resins, or may be used in combination with a fiber layer described later. In addition, this resin reinforcement layer may shape | mold by the appropriate method using the said resin, or may laminate | stack the said resin previously shape | molded in the film form.
[0025]
The fiber layer can be formed using a known woven fabric or non-woven fabric. Specifically, natural fibers such as hemp, wool, silk, and cotton, recycled fibers such as viscose, polyester, nylon ( Nylon, 66, 46, etc.), vinylon, vinylidene chloride, polyolefin (polyethylene, polypropylene, etc.), synthetic fibers such as polyclerk, semi-synthetic fibers such as acetate, aramid fibers, polyvinyl alcohol fibers, polyacrylonitrile fibers, etc. Examples thereof include woven fabrics and non-woven fabrics such as functional fibers, stainless steel, and other metal fibers such as steel. In this case, the fabric structure of the woven fabric can be selected as appropriate, such as plain weave, oblique weave, satin weave, and combinations thereof. A cloth is preferably used.
[0026]
The fiber layer may be a fiber layer having a multi-layer structure in which a plurality of the woven fabrics and non-woven fabrics are laminated. In this case, the thickness of the fiber layer is not particularly limited, but is 0.01 to 2 mm, particularly Preferably, the thickness is about 0.05 to 0.5 mm. If the thickness of the fiber layer is less than 0.01 mm, the dimensional stability due to the fiber layer is reduced, and deformation such as elongation occurs in the belt-shaped member. On the other hand, if it exceeds 2 mm, the flexibility of the belt-shaped member may be impaired. The fiber diameter of the woven fabric or nonwoven fabric forming the fiber layer is not particularly limited, but is preferably 20 to 420 denier, particularly 30 to 210 denier, and more preferably 30 to 80 denier. Further, the woven fabric and the nonwoven fabric are not particularly limited, but are preferably relatively thin, specifically, a thickness of 0.01 to 0.2 mm, particularly 0.05 to 0.15 mm. It is preferable that In this case, if the thickness of the woven fabric or nonwoven fabric is less than 0.01 mm, the dimensional stability due to the fiber layer may be reduced, and deformation such as elongation may occur in the belt-shaped member. If it exceeds 2 mm, the flexibility of the member may be impaired.
[0027]
The woven fabric or non-woven fabric that forms the fiber layer can be impregnated with rubber or resin on the surface portion or the entire surface as necessary, whereby the fiber layer and the conductive rubber layer or the covering layer can be impregnated. Adhesiveness and surface smoothness can be improved. In this case, as the impregnating agent, rubber cement or epoxy resin, resorcin formaldehyde (RFL), and a mixture thereof, which are made of the same type of rubber as exemplified as the rubber component of the conductive rubber layer, are preferably used. By immersing, the woven fabric or non-woven fabric can be pre-impregnated with the impregnating agent, whereby a woven fabric or non-woven fabric impregnated with rubber or resin can be easily obtained.
[0028]
The office equipment member of the present invention is used in various forms such as a belt shape, a roller shape, a drum shape, and a plate shape as described above, but a belt shape, a drum shape, or a particularly good elasticity is required. In the case of a roller-shaped member, the effect is remarkable, and as its application, in office equipment such as a copying machine and a printer, charging, development, transfer, intermediate transfer, toner layer formation, toner conveyance, toner stirring Various applications such as cleaning, toner fixing, paper conveyance, etc. can be mentioned, but since strict resistance control is required and excellent ozone resistance is required, color images are formed by an intermediate transfer method. In particular, the effect is particularly remarkable when a belt or drum used as an intermediate transfer member is used.
[0029]
Here, as an example of an apparatus for forming a color image by such an intermediate transfer method, the image forming apparatus of FIG. 1 is used as an apparatus using a drum-shaped intermediate transfer member, and a belt-shaped intermediate transfer member is used. The image forming apparatus of FIG. 2 can be exemplified as the apparatus.
[0030]
That is, in FIGS. 1 and 2, reference numeral 1 denotes a drum-shaped photoconductor, which rotates in the direction of the arrow in the drawing. The photosensitive member 1 is charged by the primary charger 2, and then the charged portion of the exposed portion is erased by the image exposure 3, and an electrostatic latent image corresponding to the first color component is formed on the photosensitive member 1. The electrostatic latent image is developed with the first color magenta toner M by the developing device 41, and the first color magenta toner image is formed on the photoreceptor 1. An intermediate transfer drum 20a (FIG. 1) or an intermediate transfer belt 20b (FIG. 2) in which the toner image rotates while being in contact with the photoreceptor 1 (hereinafter, these are collectively referred to as “intermediate transfer members 20a and 20b”). Is transcribed. In this case, the transfer from the photoreceptor 1 to the intermediate transfer members 20a and 20b is performed by a primary transfer bias applied from the power source 61 to the intermediate transfer members 20a and 20b at the nip portion between the photoreceptor 1 and the intermediate transfer members 20a and 20b. Is done. After the first color magenta toner image is transferred to the intermediate transfer members 20a and 20b, the surface of the photoreceptor 1 is cleaned by the cleaning device 14, and the development transfer operation for the first rotation of the photoreceptor is completed. Thereafter, the photoconductor rotates three times, and the second color cyan toner image, the third color yellow toner image, and the fourth color black toner image are sequentially used by the developing units 42 to 44 for each turn. The toner image is formed on the intermediate transfer member 20a and 20b and is superimposed and transferred to each intermediate transfer member 20a and 20b, and a composite color toner image corresponding to the target color image is formed on the intermediate transfer member 20a and 20b. In the apparatus of FIG. 2, the developing devices 41 to 44 are sequentially replaced with each rotation of the photoreceptor 1 so that development with magenta toner M, cyan toner C, yellow toner Y, and black toner B is sequentially performed. It has become.
[0031]
Next, the transfer roller 25 comes into contact with the intermediate transfer members 20a and 20b on which the composite color toner image is formed, and the recording medium 24 such as paper is fed from the paper feed cassette 9 to the nip portion. At the same time, the secondary transfer bias is applied from the power source 29 to the transfer roller 25, the combined color toner image is transferred from the intermediate transfer members 20a and 20b to the recording medium 24, and this recording medium 24 is further introduced into the fixing device 15. The composite color toner image on the recording medium 24 is heat-fixed and becomes a final image. Then, the intermediate transfer members 20a and 20b after transferring the composite color toner image to the recording medium 24, the transfer residual toner on the surface is removed by the cleaning device 35, and the initial state is returned to prepare for the next image formation. ing.
[0032]
The office machine member of the present invention is suitably used as the intermediate transfer members 20a and 20b used in such an intermediate transfer type image forming apparatus. For example, as shown in the intermediate transfer member 20a of FIG. In the case of a drum shape, as shown in FIG. 3, an elastic body layer 201 made of the semiconductive rubber material is laminated on a metal drum base 200, and the above-described coating layer 202 is further provided as necessary. In the case of a belt like the intermediate transfer member 20b in FIG. 2, as shown in FIG. 4, a canvas, a thread wound in a spiral shape, etc. (not shown) The elastic body 201 made of the semiconductive rubber material reinforced with the above can be formed into a belt shape, and the above-described coating layer 202 can be formed as necessary.
[0033]
By using the member of the present invention having a coating layer using the specific polyolefin-based urethane resin as the intermediate transfer drum 20a and the intermediate transfer belt 20b, the resistance value can be adjusted relatively easily. The intermediate transfer members 20a and 20b with little variation in resistance value can be stably obtained, and the coating layer on the surface satisfactorily follows the elastic deformation of the member without causing inconvenience such as cracking in the coating layer. Moreover, it is excellent in ozone resistance and the like, and can exhibit good image forming performance (intermediate transfer performance) over a long period of time. A preferable resistance value for the intermediate transfer member is usually in the range of 10 ¹⁰ to 10 ¹⁴ Ω · cm, particularly 10 ¹² to 10 ¹⁴ Ω · cm.
[0034]
【The invention's effect】
The member for office equipment according to the present invention has a coating layer formed on its surface that can follow the elastic deformation of the member satisfactorily, has a long life, has little environmental dependency of resistance, and easily adjusts the resistance value. Therefore, good performance can be stably exhibited over a long period of time, and a product having a certain performance can be obtained reliably and stably.
[0035]
【Example】
Hereinafter, although an example and a comparative example are shown and the effect of the present invention is shown more concretely, the present invention is not restricted to the following example.
[Examples 1 to 3 and Comparative Examples 1 and 2]
A woven fabric is wound on a mandrel, and a rubber with a resistance value adjusted by adding carbon to a blend of nitrile rubber and ethylene propylene rubber is laminated on the mandrel, and this is vulcanized and molded to a width of 240 mm and a circumference of 450 mm. A rubber belt having a thickness of 1 mm was prepared. The rubber had a JIS-A hardness of 40 ° and a resistance value of 1.0 × 10 ⁶ Ω · cm in terms of volume resistivity.
[0036]
Hydrogenated 1,2-polybutadiene polyol (manufactured by Mitsubishi Chemical Corporation, GI-1000) as a polyolefin-based polyol, IPDI TMP adduct (Takeda Chemical Industries, Takenate D140N) and HDI caprolactam adduct (polyisocyanate compound) Asahi Kasei Co., Ltd., E405-80T) was used to prepare paints having the compositions shown in Table 1. Using this coating material, a coating film having a thickness of about 30 μm was formed on the rubber belt by spraying, followed by drying and curing at 120 ° C. for 1 hour to form a coating layer, and an intermediate transfer belt having a coating layer on the surface was prepared.
[0037]
[Comparative Example 3]
A polyester urethane polyol (Niporan 3126, manufactured by Nippon Polyurethane Co., Ltd.) is used in place of the polyolefin polyol, and a paint having the composition shown in Table 1 is prepared using TDI as a polyisocyanate. A coating layer is formed using this paint. An intermediate transfer belt was prepared in the same manner as in Example 1 except that it was formed.
[0038]
Each of the obtained intermediate transfer belts was evaluated for the following characteristics. The results are shown in Table 1.
[Evaluation item]
Adjustability of resistance The volume resistivity value after forming the coating layer was measured, and the volume resistivity was 1.0 × 10 ⁶ Ω · cm before the formation was 10 ¹² to 10 ¹⁴ Ω · cm. It was investigated whether it was adjusted to the range.
Environmental dependency of resistance Each belt is left for 2 days under conditions of temperature 15 ° C / humidity 10% (L / L) and temperature 32.5 ° C / humidity 85% (H / H). Then, the volume resistivity was measured under each condition, and the difference (number of digits) in the resistance value between the L / L condition and the H / H condition was obtained.
Photoconductor contamination test A load of 500 g is applied to both ends of the photosensitive drum, pressed against each belt with a total load of 1000 g, left for 3 weeks, and then peeled off from the photosensitive drum to contaminate the surface of the photosensitive drum. The condition was observed.
Toner adhesion test The toner was sprinkled on each belt and then wiped off with cotton paper, and the toner remaining on the belt was observed.
Coefficient of friction Using a Haydon surface tester, the maximum coefficient of static friction with respect to the polyester film at a load of 200 g was measured.
Belt bending test A test piece having a width of 20 mm and a length of 350 mm was cut out from each belt, applied to a pulley with a diameter of 16 mm, and a load was applied to both ends so that the tension was 1 kg / 1 mm, and the speed was 30 rpm. The belt surface was observed every predetermined number of times.
[0039]
[Table 1]

[0040]
As is apparent from the results shown in Table 1, the intermediate transfer belts of Examples 1 to 3 which are members for office equipment according to the present invention have resistance adjustability, resistance dependency on the environment, photoreceptor contamination, and toner adhesion. It was confirmed that the friction characteristics were excellent and the durability against bending was remarkably excellent.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating an example of an image forming apparatus using an intermediate transfer method.
FIG. 2 is a schematic diagram illustrating another example of an image forming apparatus using an intermediate transfer method.
FIG. 3 is a schematic sectional view showing an example of a member for office equipment (drum-shaped intermediate transfer member) according to the present invention.
FIG. 4 is a partial schematic sectional view showing an example of a member for office equipment (belt-shaped intermediate transfer member) according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Photoconductor 2 Primary charger 3 Image exposure 9 Paper feed cassette 14 Cleaning device 15 Fixing device 20a Intermediate transfer member (drum shape)
20b Intermediate transfer member (belt shape)
24 Recording medium 25 Transfer roller 29 Bias power source 35 Intermediate transfer member cleaning device 41 Magenta color developing device 42 Cyan color developing device 43 Yellow color developing device 44 Black color developing device 61 Bias power source 200 Substrate 201 Conductive rubber layer 202 Covering layer

Claims (4)

It has a coating layer on the surface, and the coating layer uses a polyolefin-based polyol as a main material and uses two or more polyisocyanate compounds as a curing agent, and at least one of them is an aliphatic isocyanate or an alicyclic group. A polyisocyanate compound selected from isocyanates and derivatives thereof, characterized in that it is formed of a urethane resin having a volume resistivity adjusted to 10 ¹³ to 10 ¹⁶ Ω · cm, or a composition containing the urethane resin. Office equipment parts to do. At least one hexamethylene diisocyanate, isophorone diisocyanate and claim 1 Symbol placement of office equipment member is a member selected from the derivatives of the polyisocyanate compounds. Belt-shaped, drum-like or roller-like member and is claim 1 or 2, wherein the office equipment member. 2. An intermediate transfer member that is disposed between an image forming body and a recording medium, temporarily transfers and holds the toner image formed on the surface of the image forming body on its surface, and transfers the toner image to the recording medium. The member for office equipment according to any one of to 3 .

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