WO2016136822A1 - Developing roller and method for producing same - Google Patents

Abstract

Provided are: a developing roller which is produced with use of roll coating, and which is provided with a coating film layer having a uniform thickness; and a method for producing this developing roller. A developing roller 10, wherein the outer circumference of a shaft 1 is sequentially provided with a base layer 2 and a coating film layer 3. The coating film layer 2 is formed from a coating material containing an ultraviolet curable resin; the coating material has a thixotropic index (a TI value) of 1.0-3.0 and a viscosity of 5-600 cp; and the coating film layer has a film thickness of 0.5-12 μm. Alternatively, the coating film layer 2 is formed from a coating material containing an ultraviolet curable resin; the coating material contains at least one thixotropic material that is selected from among carbon black having a DBP oil absorption of 150-550 ml/100 g and a DBP oil absorption with respect to nitrogen adsorption specific surface area of 0.3-0.7 ml/m² and silica having secondary particle diameters of 0.01-3 μm; and the coating film layer has a film thickness of 0.5-12 μm.

Description

Developing roller and manufacturing method thereof

The present invention relates to a developing roller (hereinafter, also simply referred to as “roller”) and a manufacturing method thereof, and more particularly to a developing roller used in an image forming process in an image forming apparatus such as a copying machine or a printer and a manufacturing method thereof.

Conventionally, as a developing method when a non-magnetic one-component developer is used as a developer (toner), toner is supplied to an image carrier such as a photosensitive drum holding an electrostatic latent image via a developing roller, and an image is obtained. A development method (pressure development method) is known in which a latent image is visualized by attaching toner to the latent image on the carrier. In this developing method, development is performed by bringing a developing roller carrying toner into contact with an image carrier holding an electrostatic latent image and attaching the toner to the latent image on the image carrier. The developing roller to be used needs to be formed of an elastic body having conductivity.

FIG. 2 shows a configuration example of a developing device using a pressure developing method. In the illustrated developing device, a developing roller 10 is disposed in contact with a photosensitive drum 12 between a toner supply roller 11 for supplying toner and a photosensitive drum 12 holding an electrostatic latent image. As the developing roller 10, the photosensitive drum 12, and the toner supply roller 11 rotate in the directions of the arrows in the drawing, the toner 13 is supplied to the surface of the developing roller 10 by the toner supply roller 11. The supplied toner is adjusted to a uniform thin layer by the stratifying blade 14, and the developing roller 10 rotates in contact with the photosensitive drum 12 in this state, whereby the toner formed in the thin layer is transferred from the developing roller 10 to the photosensitive drum. The latent image is visualized by attaching to the 12 latent images. Note that reference numeral 15 in the drawing denotes a transfer portion, where a toner image is transferred to a recording medium such as paper. Reference numeral 16 denotes a cleaning unit, and toner remaining on the surface of the photosensitive drum 12 after transfer is removed by a cleaning blade 17.

As a conventional technique related to a method for manufacturing a roller, for example, Patent Document 1 discloses a ring-shaped coating that discharges a liquid material having thixotropy and has an annular discharge port formed along the circumferential direction on the inner peripheral surface. A method of having an elastic layer around a shaft core using a head is disclosed.

JP 2010-128332 A (claims, etc.)

Such a developing roller is usually formed by providing an elastic layer made of a resin material or a rubber material on the outer periphery of the shaft. Further, one or more layers are further provided on the surface of the developing roller in order to adjust roller physical properties and surface properties. It is also performed to provide a coating layer. As a method of providing a coating film layer on the roller surface, roll coating, dip coating (dip coating), spray coating, or the like is used.

Among these, the roll coat is a method of forming a coating film layer on the surface of the coating object by temporarily attaching the coating material to the surface of the coating roll and bringing the surface of the roll to which the coating material has adhered into contact with the coating object. There is a merit that it can be easily implemented with little waste of paint. However, when a roll coat is used, depending on the type of the object to be coated, the paint may be repelled on the surface, making it difficult to form a coating having a uniform thickness.

Accordingly, an object of the present invention is to provide a technique for solving the above-described problems and providing a coating film layer with a uniform thickness in a developing roller manufactured using a roll coat.

As a result of intensive studies, the present inventor has found that the above-described problem can be solved by adopting the following configuration, and has completed the present invention.
That is, the developing roller of the present invention is a developing roller comprising a base layer and a coating layer on the outer periphery of the shaft in order,
The coating layer is formed from a coating containing an ultraviolet curable resin, and the coating layer has a thixotropic index of 1.0 to 3.0, a viscosity of 5 to 600 cp, and the coating layer. The film thickness is 0.5 to 12 μm.

In the above roller of the present invention, the paint has carbon black having a DBP oil absorption of 150 to 550 ml / 100 g and a DBP oil absorption of 0.3 to 0.7 ml / m ² per nitrogen adsorption specific surface area, and It is preferable to contain at least one thixotropic material selected from silica having a secondary particle size of 0.01 to 3 μm.

Further, another developing roller of the present invention is a developing roller comprising a base layer and a coating film layer sequentially on the outer periphery of the shaft.
The coating layer is formed from a paint containing an ultraviolet curable resin, and the paint has a DBP oil absorption of 150 to 550 ml / 100 g and a DBP oil absorption of 0.3 to 0.7 ml per nitrogen adsorption specific surface area. / m ² and is carbon black, and contains at least one thixotropic material secondary particle size is selected from among silica 0.01 ~ 3 [mu] m, and the thickness of the coating film layer 0. It is characterized by being 5 to 12 μm.

In the roller of the present invention, the paint preferably has a thixotropic index of 1.0 to 3.0 and a viscosity of 5 to 600 cp.

In the present invention, the ultraviolet curable resin preferably has an ester skeleton. Furthermore, in the present invention, the coating material preferably contains 1 to 15 parts by mass of the thixotropic material with respect to 100 parts by mass of the ultraviolet curable resin.

Furthermore, the method for producing a developing roller of the present invention is characterized in that the paint is applied by roll coating.

According to the present invention, it is possible to realize a developing roller manufactured using a roll coat and provided with a coating layer having a uniform thickness, and a manufacturing method thereof.

FIG. 3 is a longitudinal sectional view according to an example of the developing roller of the present invention. It is a schematic explanatory drawing which shows one structural example of the image development apparatus using a pressure development method. It is a schematic explanatory drawing which shows the formation method of the coating film layer by roll coating. It is explanatory drawing which concerns on the film thickness measuring method of the coating-film layer of the developing roller in an Example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view according to an example of the developing roller of the present invention. As shown in the figure, the developing roller 10 of the present invention is provided with a base layer 2 and a coating layer 3 in order on the outer periphery of the shaft 1.

In the present invention, the coating layer 3 is formed from a paint containing an ultraviolet curable resin, and this paint has a thixotropic index (TI value) of 1.0 to 3.0 and a viscosity of 5 to It is important that the thickness is 600 cp and the thickness of the coating layer 3 is 0.5 to 12 μm. By defining the thixotropy of a paint containing an ultraviolet curable resin, before the applied paint is repelled on the base layer 2, it can be cured by ultraviolet irradiation to form a coating layer. The coating layer 3 can be formed uniformly. In addition, along with this, the adhesion between the base layer 2 and the coating film layer 3 can also be ensured satisfactorily.

Here, the viscosity is a value at a rotation speed of 60 rpm measured using a B-type viscometer after adjusting the paint temperature to 25 ° C., and the TI value is represented by the following formula:
TI value = η ₆ (viscosity at 6 rpm) / η ₆₀ (viscosity at 60 rpm)
Is a value calculated by.

In the present invention, since the coating layer is formed using a paint containing an ultraviolet curable resin, when roll coating is adopted as a coating layer forming method, immediately after coating, for example, 5 By irradiating ultraviolet rays after ˜30 seconds, a coating layer can be formed easily and simply in a short time, and the productivity and cost of the roller can be improved.

When the TI value of the paint is less than 1.0, the paint is repelled, and when it exceeds 3.0, uneven coating occurs, and in any case, the desired effect of the present invention is obtained. I can't. Further, if the viscosity of the paint is less than 5 cp, the paint is repelled, and if it exceeds 600 cp, uneven coating occurs, and in any case, the desired effect of the present invention cannot be obtained. In the present invention, the TI value of the paint is preferably 1.0 to 1.5, and the viscosity of the paint is preferably 30 to 100 cp.

In the present invention, the coating material may include an ultraviolet curable resin and have a TI value and a viscosity having the predetermined values.

In the present invention, the ultraviolet curable resin used for the paint is not particularly limited, but when a urethane resin is used as the material of the base layer 2, it is preferable to use a urethane (meth) acrylate oligomer. In particular, it is more preferable to use a urethane (meth) acrylate oligomer having an ester skeleton as the ultraviolet curable resin because of high crystallinity.

The urethane (meth) acrylate oligomer has at least one acryloyloxy group (CH ₂ ═CHCOO—) or methacryloyloxy group (CH ₂ ═C (CH ₃ ) COO—), and has a urethane bond (—NHCOO—). A compound having a plurality. This urethane (meth) acrylate oligomer preferably has a functional group number of 3.0 or less, particularly 1.5 to 2.5. Here, the functional group refers to an acryloyloxy group and a methacryloyloxy group, and the number of functional groups refers to the average number of functional groups. If the number of functional groups of the urethane (meth) acrylate oligomer is 3.0 or less, the crosslinking density in the UV curable resin will increase moderately, so that the amount of acetone extracted can be reduced without increasing the hardness of the layer. And the effect of improving the contamination of adjacent members such as a photoconductor can be obtained. In addition, when a trifunctional urethane (meth) acrylate oligomer is contained in the urethane (meth) acrylate oligomer, the hardness of the layer may be increased.

The urethane (meth) acrylate oligomer preferably has a number average molecular weight in terms of polystyrene of 5,000 to 100,000. If the molecular weight of the urethane (meth) acrylate oligomer is less than 5,000, the hardness of the layer may be too high, while if it exceeds 100,000, the compressive residual strain of the layer may be too large.

Although it does not restrict | limit especially as said urethane (meth) acrylate oligomer, For example, what was manufactured by synthesize | combining a urethane prepolymer from a polyol and polyisocyanate, and adding the (meth) acrylate which has a hydroxyl group to this urethane prepolymer. Can be suitably used.

The polyol used for the synthesis of the urethane prepolymer is a compound having a plurality of hydroxyl groups (OH groups). Specific examples of the polyol include polyether polyol, polyester polyol, polytetramethylene glycol, polybutadiene polyol, and polycarbonate polyol. , Alkylene oxide-modified polybutadiene polyol and polyisoprene polyol. The polyether polyol can be obtained, for example, by adding an alkylene oxide such as ethylene oxide or propylene oxide to a polyhydric alcohol such as ethylene glycol, propylene glycol, or glycerin. Examples of the polyester polyol include polyhydric alcohols such as ethylene glycol, diethylene glycol, 1,4-butanediol, 1,6-hexanediol, propylene glycol, trimethylolethane, trimethylolpropane, adipic acid, and glutaric acid. It can also be obtained from polyvalent carboxylic acids such as succinic acid, sebacic acid, pimelic acid and suberic acid. These polyols may be used individually by 1 type, and may mix and use 2 or more types suitably.

The polyol used for the synthesis of the urethane prepolymer preferably has a molecular weight in the range of 500 to 15,000. If the molecular weight of the polyol used for the synthesis of the urethane prepolymer is less than 500, the hardness becomes high, so that it is not suitable for the elastic layer. On the other hand, if it exceeds 15,000, the compressive residual strain increases and image defects occur. It becomes easy.

The polyisocyanate used for the synthesis of the urethane prepolymer is a compound having a plurality of isocyanate groups (NCO groups). Specific examples of such polyisocyanates include tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), crude diphenylmethane diisocyanate (crude MDI), isophorone diisocyanate (IPDI), hydrogenated diphenylmethane diisocyanate, hydrogenated tolylene diisocyanate, hexamethylene. Examples thereof include diisocyanate (HDI), these isocyanurate-modified products, carbodiimide-modified products, and glycol-modified products. These polyisocyanates may be used individually by 1 type, and may be used in mixture of 2 or more types as appropriate.

Here, the urethane prepolymer preferably has an isocyanate index in the range of 110 to 200, and more preferably in the range of 115 to 200. The isocyanate index is a value calculated by (B / A) × 100, where A is the number of OH groups in the polyol and B is the number of NCO groups in the polyisocyanate. If the isocyanate index of the urethane prepolymer is less than 110, the compression residual strain increases and image defects are likely to occur. On the other hand, if it exceeds 200, the isocyanate that does not react with the polyol increases and the physical properties deteriorate.

In the synthesis of the urethane prepolymer, a catalyst for urethanization reaction is preferably used. Examples of the catalyst for urethanization reaction include dibutyltin dilaurate, dibutyltin diacetate, dibutyltin thiocarboxylate, dibutyltin dimaleate, dioctyltin thiocarboxylate, tin octenoate, monobutyltin oxide and the like; stannous chloride, etc. Inorganic lead compounds; organic lead compounds such as lead octenoate; monoamines such as triethylamine and dimethylcyclohexylamine; diamines such as tetramethylethylenediamine, tetramethylpropanediamine, and tetramethylhexanediamine; pentamethyldiethylenetriamine, pentamethyldipropylene Triamines such as triamine and tetramethylguanidine; triethylenediamine, dimethylpiperazine, methylethylpiperazine, methylmorpholine, Cyclic amines such as methylaminoethylmorpholine, dimethylimidazole, pyridine; alcohol amines such as dimethylaminoethanol, dimethylaminoethoxyethanol, trimethylaminoethylethanolamine, methylhydroxyethylpiperazine, hydroxyethylmorpholine; bis (dimethylaminoethyl) Ethers such as ether and ethylene glycol bis (dimethyl) aminopropyl ether; organic sulfonic acids such as p-toluenesulfonic acid, methanesulfonic acid and fluorosulfuric acid; inorganic acids such as sulfuric acid, phosphoric acid and perchloric acid; sodium alcoholate , Bases such as lithium hydroxide, aluminum alcoholate, sodium hydroxide; tita such as tetrabutyl titanate, tetraethyl titanate, tetraisopropyl titanate Compounds; bismuth compounds; quaternary ammonium salts, and the like. Of these catalysts, organotin compounds are preferred. These catalysts may be used individually by 1 type, and may be used in combination of 2 or more type. The amount of the catalyst used is preferably in the range of 0.001 to 2.0 parts by mass with respect to 100 parts by mass of the polyol.

The (meth) acrylate having a hydroxyl group to be added to the urethane prepolymer has one or more hydroxyl groups, and is an acryloyloxy group (CH ₂ ═CHCOO—) or a methacryloyloxy group (CH ₂ ═C (CH ₃ ) COO. A compound having one or more-). The (meth) acrylate having such a hydroxyl group can be added to the isocyanate group of the urethane prepolymer. Examples of the (meth) acrylate having a hydroxyl group include 2-hydroxyethyl (meth) acrylate and 2-hydroxypropyl (meth) acrylate. These acrylates having a hydroxyl group may be used alone or in combination of two or more.

In the present invention, instead of specifying the TI value and viscosity of the paint, the DBP oil absorption amount is 150 to 550 ml / 100 g together with the UV curable resin and the DBP oil absorption amount per nitrogen adsorption specific surface area. Also by blending at least one thixotropic material selected from carbon black having an average secondary particle size of 0.01 to 3 μm and carbon black having a 0.3 to 0.7 ml / m ² The desired effect of the present invention can be obtained. Also in this case, the coating layer is formed by adjusting the thixotropy of the coating material while ensuring the required performance of the coating layer itself, and curing by ultraviolet irradiation before the applied coating material is repelled on the base layer 2. Thus, the coating layer 3 can be uniformly formed on the base layer 2. Examples of carbon black that can be used as the thixotropic material include acetylene black and ketjen black.

Further, in the present invention, the TI value and viscosity of the paint are specified, and the thixotropic material is blended in the paint, thereby facilitating the adjustment of the thixotropy of the paint and the effects of the present invention. This is preferable because it can be obtained more reliably.

The blending amount of the thixotropic material in the paint can be 1 to 15 parts by mass with respect to 100 parts by mass of the ultraviolet curable resin, whereby a coating layer that satisfies the desired performance can be obtained with a uniform thickness. It becomes easy to obtain.

It is preferable that a photopolymerization initiator is further added to the paint. The photopolymerization initiator has an action of initiating polymerization of the ultraviolet curable resin by irradiation with ultraviolet rays. Such photopolymerization initiators include 4-dimethylaminobenzoic acid, 4-dimethylaminobenzoic acid ester, 2,2-dimethoxy-2-phenylacetophenone, acetophenone diethyl ketal, alkoxyacetophenone, benzyldimethyl ketal, benzophenone and 3,3 -Benzyl derivatives such as dimethyl-4-methoxybenzophenone, 4,4-dimethoxybenzophenone, 4,4-diaminobenzophenone, benzyl derivatives such as alkyl benzoylbenzoate, bis (4-dialkylaminophenyl) ketone, benzyl and benzylmethyl ketal Benzoin derivatives such as benzoin and benzoin isobutyl ether, benzoin isopropyl ether, 2-hydroxy-2-methylpropiophenone, 1-hydroxysilane Rohexyl phenyl ketone, xanthone, thioxanthone and thioxanthone derivatives, fluorene, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, bis (2,6-dimethoxybenzoyl) -2,4,4-trimethylpentylphosphine oxide, bis (2 , 4,6-Trimethylbenzoyl) -phenylphosphine oxide, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropane-1,2-benzyl-2-dimethylamino-1- (morpholinophenyl) -Butanone-1 and the like. Specifically, for example, IRGACURE 651, 184, 500, 2959, 127, 1800, 784, 907, 369, 379, 819, DAROCUR 1173, 4265, TPO (all manufactured by BASF Japan Co., Ltd.) and the like can be used. These photopolymerization initiators may be used alone or in combination of two or more.

In particular, when carbon black is blended as a thixotropic material in the coating material, it is preferable to blend a photopolymerization initiator having a maximum absorption wavelength band of 400 nm or more. As the photopolymerization initiator having such a long wavelength absorption band, α-aminoacetophenone, acylphosphine oxide, thioxanthone, amine and the like can be used. More specifically, bis (2, 4, 6 Mention may be made of -trimethylbenzoyl) -phenylphosphine oxide or 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one. In this case, it is preferable to use a short wavelength having a maximum absorption wavelength band of less than 400 nm in combination, so that the curing reaction can proceed well not only in the back of the layer but also in the vicinity of the surface of the layer. it can. Examples of the photopolymerization initiator having such a short wavelength absorption band include 2,2-dimethoxy-1,2-diphenylethane-1-one, 1-hydroxy-cyclohexyl-phenyl ketone, 2-hydroxy-2-methyl. -1-phenylpropan-1-one, 1- [4- (2-hydroxyethoxy) phenyl] -2-hydroxy-2-methyl-1-propan-1-one, 2-methyl-1- [4-phenyl ] -2-morpholinopropan-1-one and the like.

The blending amount of the photopolymerization initiator in the paint is preferably in the range of 0.2 to 5.0 parts by mass, particularly 0.5 to 2 parts by mass with respect to 100 parts by mass of the ultraviolet curable resin meter.

In addition, it is preferable to blend a silicone material or a fluorine material as a material containing silicon or fluorine in the molecule. As such a material, for example, a (meth) acrylate monomer containing silicon or fluorine in the molecule can be used. Thereby, the softness | flexibility of a coating-film layer can be improved and the elastic modulus can be reduced, without increasing the friction coefficient of the coating-film layer surface. This is considered due to the water repellency and oil repellency of silicon or fluorine.

Here, the (meth) acrylate monomer is a monomer having one or more acryloyloxy groups (CH ₂ ═CHCOO—) or methacryloyloxy groups (CH ₂ ═C (CH ₃ ) COO—), and is used as a reactive diluent. In addition to acting, that is, curing with ultraviolet rays, it is possible to reduce the viscosity of the paint. The molecular weight of the (meth) acrylate monomer is not particularly limited, but is preferably 70 to 2,000. This (meth) acrylate monomer may be used individually by 1 type, and may be used in combination of 2 or more type.

The (meth) acrylate monomer preferably has 1 to 4 functional groups. Here, the functional group refers to an acryloyloxy group and a methacryloyloxy group, and the number of functional groups refers to the average number of functional groups. When the number of functional groups of the (meth) acrylate monomer exceeds 4, the crosslink density in the ultraviolet curable resin increases, which may increase the elastic modulus.

The (meth) acrylate monomer preferably has a bulky substituent or polar group in addition to the acryloyloxy group or methacryloyloxy group. Since the (meth) acrylate monomer has a bulky substituent or polar group, the polymer chain after polymerization becomes three-dimensionally bulky, or the polar group interaction in the polymer chain becomes stronger. Crystallinity decreases. In general, amorphous polymers tend to have better elongation characteristics than crystalline polymers. Therefore, (meth) acrylate monomers having bulky substituents or polar groups tend to lower the elastic modulus of the coating layer. It is considered effective. Specific examples of such (meth) acrylate monomers include acryloylmorpholine, N, N-diethylaminoethyl methacrylate, isobornyl acrylate, and phenoxyethyl acrylate. A (meth) acrylate monomer may be used individually by 1 type, and may be used in combination of 2 or more type.

The silicon-containing (meth) acrylate monomer is preferably a double-end reactive silicone oil, a single-end reactive silicone oil, or a (meth) acryloxyalkylsilane. Here, the both-end-reactive silicone oils and the one-end-reactive silicone oils refer to those having an acryloyloxy group or a methacryloyloxy group introduced as a reactive end.

Examples of the both-end reactive silicone oils include the following formula (I),

(Wherein, m is the number of repeating units). Commercially available products can be used as the both-end reactive silicone oils. For example, the product name “X-22-164A” (viscosity 25 mm ² / s, functional group equivalent 860 g / s) manufactured by Shin-Etsu Chemical Co., Ltd. mol), product name “X-22-164B” (viscosity 55 mm ² / s, functional group equivalent 1630 g / mol), product name “X-22-164C” (viscosity 90 mm ² / s, functional group equivalent 2370 g / mol), Toray Industries, Inc.・ Product number “BX16-152B” manufactured by Dow Corning Silicone Co., Ltd. (viscosity 40 cs / 25 ° C., methacryl group equivalent 1300 g / mol, specific gravity 0.97 at 25 ° C.), product number “BY16-152” (viscosity 85 cs / 25 ° C., methacryl group equivalent 2800 g / mol, specific gravity 0.97 at 25 ° C.), product number “BX2-152C” (viscosity 330 cs / 25 ° C., It can be used specific gravity 0.97) and the like Le group equivalent 5100g / mol, 25 ℃.

Moreover, as one terminal reactive silicone oils, following formula (II),

(Wherein R ¹ is a methyl group or a butyl group, and n is the number of repeating units), and the following formula (III),

The silicone oil represented by these is mentioned. As such one-terminal reactive silicone oils, commercially available products can be used. For example, the product name “X-24-8201” (viscosity 25 mm ² / s, functional group equivalent 2100 g / s) manufactured by Shin-Etsu Chemical Co., Ltd. mol), product name “X-22-174DX” (viscosity 60 mm ² / s, functional group equivalent 4600 g / mol), product name “X-22-2426” (viscosity 180 mm ² / s, functional group equivalent 12000 g / mol), Toray Industries, Inc. A product number “BX16-122A” (viscosity 5 cs / 25 ° C., refractive index 1.417, specific gravity 0.92 at 25 ° C.) manufactured by Dow Corning Silicone Co., Ltd. can be used.

Furthermore, the (meth) acryloxyalkylsilanes include 3-methacryloxypropyldichloromethylsilane [CH ₂ ═C (CH ₃ ) COO (CH ₂ ) ₃ SiCl ₂ CH ₃ ], 3-acryloxypropyldimethoxymethyl. Silane [CH ₂ = CHCOO (CH ₂ ) ₃ Si (OCH ₃ ) ₂ CH ₃ ], 3-acryloxypropyltrimethoxysilane [CH ₂ = CHCOO (CH ₂ ) ₃ Si (OCH ₃ ) ₃ ], 3-methacryl b propyl dimethoxy methyl silane _{[CH 2 = C (CH 3} ) COO (CH 2) 3 Si (OCH 3) 2 CH 3], 3- methacryloxypropyl trimethoxysilane _{[CH 2 = C (CH 3} ) COO (CH _{2) 3 Si (OCH 3)} 3], 3- methacryloxypropyltrimethoxysilane diethoxy main Rushiran _{[CH 2 = C (CH 3} ) COO (CH 2) 3 Si (OC 2 H 5) 2 CH 3], 3- methacryloxypropyl triethoxysilane _{[CH 2 = C (CH 3} ) COO (CH 2) _{3 Si (OC 2 H 5)} 3] , and the like. Commercially available products can be used as the (meth) acryloxyalkylsilanes, for example, product numbers “LS-2080”, “LS-2826”, “LS-2828”, “LS2827”, “Shin-Etsu Chemical Co., Ltd.” “LS-3375”, “LS-3380”, “LS-4548”, “LS-5118” and the like can be used.

The fluorine-containing (meth) acrylate monomer is preferably an alkyl (meth) acrylate having 5 to 16 carbon atoms in which one or more hydrogen atoms are substituted with fluorine. Specifically, 2,2,2 -Trifluoroethyl acrylate [CF ₃ CH ₂ OCOCH═CH ₂ , fluorine content 37% by mass], 2,2,3,3,3-pentafluoropropyl acrylate [CF ₃ CF ₂ CH ₂ OCOCH═CH ₂ , fluorine Content 47% by mass], 2- (perfluorobutyl) ethyl acrylate [CF ₃ (CF ₂ ) ₃ CH ₂ CH ₂ OCOCH═CH ₂ , fluorine content 54% by mass], 3- (perfluorobutyl) -2 - hydroxypropyl acrylate _{[CF 3 (CF 2) 3} CH 2 CH (OH) CH 2 OCOCH = CH 2, fluoride Content 49 wt%], 2- (perfluorohexyl) ethyl acrylate _{[CF 3 (CF 2) 5} CH 2 CH 2 OCOCH = CH 2, fluorine content 59 wt%], 3- (perfluorohexyl) -2 -Hydroxypropyl acrylate [CF ₃ (CF ₂ ) ₅ CH ₂ CH (OH) CH ₂ OCOCH = CH ₂ , fluorine content 55% by mass], 2- (perfluorooctyl) ethyl acrylate [CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ OCOCH═CH ₂ , fluorine content 62 mass%], 3- (perfluorooctyl) -2-hydroxypropyl acrylate [CF ₃ (CF ₂ ) ₇ CH ₂ CH (OH) CH ₂ OCOCH═CH ₂ , fluorine content 59 wt%], 2- (perfluoro decyl) ethyl acrylate _[CF 3 (C _{2) 9 CH 2 CH 2 OCOCH} = CH 2, fluorine content 65 wt%], 2- (perfluoro-3-methylbutyl) ethyl acrylate _{[(CF 3) 2 CF (} CF 2) 2 CH 2 CH 2 OCOCH = CH ₂ , fluorine content 57 mass%], 3- (perfluoro-3-methylbutyl) -2-hydroxypropyl acrylate [(CF ₃ ) ₂ CF (CF ₂ ) ₂ CH ₂ CH (OH) CH ₂ OCOCH═CH ₂ , fluorine content 52% by mass], 2- (perfluoro-5-methylhexyl) ethyl acrylate [(CF ₃ ) ₂ CF (CF ₂ ) ₄ CH ₂ CH ₂ OCOCH = CH ₂ , fluorine content 61% by mass ], 3- (perfluoro-5-methylhexyl) -2-hydroxypropyl acrylate [(CF ₃ ) ₂ CF (CF ₂ ) ₄ CH ₂ CH (OH) CH ₂ OCOCH═CH ₂ , fluorine content 57 mass%], 2- (perfluoro-7-methyloctyl) ethyl acrylate [(CF ₃ ) ₂ CF (CF ₂ ) ₆ CH ₂ CH ₂ OCOCH═CH ₂ , fluorine content 64 mass%], 3- (perfluoro-7-methyloctyl) -2-hydroxypropyl acrylate [(CF ₃ ) ₂ CF (CF ₂ ) ₆ CH ₂ CH (OH ) CH ₂ OCOCH═CH ₂ , fluorine content 60 mass%], 1H, 1H, 3H-tetrafluoropropyl acrylate [CHF ₂ CF ₂ CH ₂ OCOCH═CH ₂ , fluorine content 41 mass%], 1H, 1H, 5H- octafluoropentyl acrylate _{[CHF 2 (CF 2) 3} CH 2 OCOCH = CH 2, fluorine-containing 53 wt%], 1H, 1H, 7H- dodecafluoroheptyl acrylate _{[CHF 2 (CF 2) 5} CH 2 OCOCH = CH 2, fluorine content 59 wt%], 1H, 1H, 9H- hexadecafluoro nonyl acrylate [ CHF ₂ (CF ₂ ) ₇ CH ₂ OCOCH═CH ₂ , fluorine content 63 mass%], 1H-1- (trifluoromethyl) trifluoroethyl acrylate [(CF ₃ ) ₂ CHOCOCH═CH ₂ , fluorine content 51 % By mass], 1H, 1H, 3H-hexafluorobutyl acrylate [CF ₃ CHFCF ₂ CH ₂ OCOCH═CH ₂ , fluorine content 48% by mass], 2,2,2-trifluoroethyl methacrylate [CF ₃ CH ₂ OCOC (CH ₃ ) = CH ₂ , fluorine content 34 mass%], ₂ , ₂ , ₃ , 3,3-pentafluoropropyl methacrylate [CF ₃ CF ₂ CH ₂ OCOC (CH ₃ ) = CH ₂ , fluorine content 44 mass%], 2- (perfluorobutyl) ethyl methacrylate [CF ₃ (CF ₂ ) ₃ CH ₂ CH ₂ OCOC (CH ₃ ) = CH ₂ , fluorine content 51 mass%], 3- (perfluorobutyl) -2-hydroxypropyl methacrylate [CF ₃ (CF ₂ ) ₃ CH ₂ CH (OH) CH ₂ OCOC (CH ₃ ) = CH ₂ , fluorine content 47 mass%], 2- (perfluorohexyl) ethyl methacrylate [CF ₃ (CF ₂ ) ₅ CH ₂ CH ₂ OCOC (CH ₃ ) = CH ₂ , fluorine content 57% by mass], 3- (perfluorohexyl) -2-hydroxypropyl methacrylate [CF ₃ (CF ₂ ) ₅ CH ₂ CH (OH) CH ₂ OCOC (CH ₃ ) = CH ₂ , fluorine content 53 mass%], 2- (perfluorooctyl) ethyl methacrylate [CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ OCOC ( CH ₃ ) = CH ₂ , fluorine content 61 mass%], 3-perfluorooctyl-2-hydroxypropyl methacrylate [CF ₃ (CF ₂ ) ₇ CH ₂ CH (OH) CH ₂ OCOC (CH ₃ ) = CH ₂ , Fluorine content 57 mass%], 2- (perfluorodecyl) ethyl methacrylate [CF ₃ (CF ₂ ) ₉ CH ₂ CH ₂ OCOC (CH ₃ ) = CH ₂ , fluorine content 63 mass%], 2- ( perfluoro-3-methylbutyl) ethyl methacrylate _{[(CF 3) 2 CF (} CF 2) 2 CH 2 CH 2 OCOC (CH ) = CH _2, fluorine content 55 wt%], 3- (perfluoro-3-methylbutyl) -2-hydroxypropyl methacrylate _{[(CF 3) 2 CF (} CF 2) 2 CH 2 CH (OH) CH 2 OCOC (CH ₃ ) = CH ₂ , fluorine content 51 mass%], 2- (perfluoro-5-methylhexyl) ethyl methacrylate [(CF ₃ ) ₂ CF (CF ₂ ) ₄ CH ₂ CH ₂ OCOC (CH ₃ ) = CH ₂ , fluorine content 59 mass%], 3- (perfluoro-5-methylhexyl) -2-hydroxypropyl methacrylate [(CF ₃ ) ₂ CF (CF ₂ ) ₄ CH ₂ CH (OH) CH ₂ OCOC _(CH 3) = CH _2, fluorine content 56 wt%], 2- (perfluoro-7-methyl-octyl) ethyl methacrylate [(C _{3) 2 CF (CF 2)} 6 CH 2 CH 2 OCOC (CH 3) = CH 2, fluorine content 62 wt%], 3- (perfluoro-7-methyl-octyl) -2-hydroxypropyl methacrylate [(CF ₃ ) ₂ CF (CF ₂ ) ₆ CH ₂ CH (OH) CH ₂ OCOC (CH ₃ ) = CH ₂ , fluorine content 59 mass%], 1H, 1H, 3H-tetrafluoropropyl methacrylate [CHF ₂ CF ₂ CH ₂ OCOC (CH ₃ ) = CH ₂ , fluorine content 51% by mass], 1H, 1H, 5H-octafluoropentyl methacrylate [CHF ₂ (CF ₂ ) ₃ CH ₂ OCOC (CH ₃ ) = CH ₂ , fluorine content 51 wt%], 1H, 1H, 7H- dodecafluoroheptyl methacrylate _{[CHF 2 (CF 2) 5} CH 2 O _{OC (CH 3) = CH 2} , fluorine content 57 wt%], 1H, 1H, 9H- hexadecafluoro nonyl methacrylate _{[CHF 2 (CF 2) 7} CH 2 OCOC (CH 3) = CH 2, the fluorine content 61 mass%], 1H-1- (trifluoromethyl) trifluoroethyl methacrylate [(CF ₃ ) ₂ CHOCOC (CH ₃ ) = CH ₂ , fluorine content 48 mass%], 1H, 1H, 3H-hexafluorobutyl Methacrylate [CF ₃ CHFCF ₂ CH ₂ OCOC (CH ₃ ) = CH ₂ , fluorine content 46 mass%] and the like.

The blending amount of the (meth) acrylate monomer containing silicon or fluorine in the paint can be in the range of 2 to 20 parts by mass with respect to 100 parts by mass of the ultraviolet curable resin.

In addition, a polymerization inhibitor may be further added to the paint at 0.001 to 0.2 parts by mass with respect to 100 parts by mass of the ultraviolet curable resin. By adding a polymerization inhibitor, thermal polymerization before ultraviolet irradiation can be prevented. Such polymerization inhibitors include hydroquinone, hydroquinone monomethyl ether, p-methoxyphenol, 2,4-dimethyl-6-t-butylphenol, 2,6-di-t-butyl-p-cresol, butylhydroxyanisole, Examples include 3-hydroxythiophenol, α-nitroso-β-naphthol, p-benzoquinone, and 2,5-dihydroxy-p-quinone. The content of the polymerization inhibitor is preferably in the range of 0.001 to 0.2 parts by mass with respect to 100 parts by mass in total of the oligomer and monomer.

Furthermore, various other known additives can be added to the coating material as long as the desired effects of the present invention are not impaired.

In the present invention, the film thickness of the coating layer 3 is 0.5 to 12 μm, preferably 0.5 to 9 μm. The coating layer 3 is not limited to one layer, and may be provided by two or more layers. When two or more layers are provided, the coating layer 3 may be formed using the same coating material or different coating materials. Good. In the present invention, when two or more coating film layers 3 are provided, the coating film layer provided on the base layer 2 may be a coating material that satisfies the above-described conditions of the present invention. Can be formed.

The shaft 1 used for the developing roller of the present invention is not particularly limited as long as it has good conductivity. A metal shaft, a resin shaft having a high rigidity disposed on the outer periphery of the metal shaft, a high rigidity Any of a resin base material, a metal hollow inside, or a cylindrical body made of high-rigidity resin may be used.

The materials for the metal shaft and the metal cylinder include iron, stainless steel, aluminum and the like. Examples of the high-rigidity resin include polyacetal, polyamide 6, polyamide 6 and 6, polyamide 12, polyamide 4 and 6, polyamide 6 and 10, polyamide 6 and 12, polyamide 11, polyamide MXD6, polybutylene terephthalate, polyphenylene oxide, Polyphenylene sulfide, polyethersulfone, polycarbonate, polyimide, polyamideimide, polyetherimide, polysulfone, polyetheretherketone, polyethylene terephthalate, polyarylate, liquid crystal polymer, polytetrafluoroethylene, polypropylene, acrylonitrile-butadiene-styrene (ABS) resin , Polystyrene, polyethylene, melamine resin, phenol resin, silicone resin and the like. Among these, polyacetal, polyamide 6 · 6, polyamide MXD6, polyamide 6 · 12, polybutylene terephthalate, polyphenylene ether, polyphenylene sulfide, and polycarbonate are preferable. These high-rigidity resins may be used alone or in combination of two or more.

In addition, when using highly rigid resin for the shaft 1, it is preferable to ensure sufficient electrical conductivity by adding and dispersing a conductive agent in the highly rigid resin. Here, as the conductive agent dispersed in the high-rigidity resin, carbon black powder, graphite powder, carbon fiber, metal powder such as aluminum, copper and nickel, metal oxide powder such as tin oxide, titanium oxide and zinc oxide, conductive A powdery conductive agent such as conductive glass powder is preferred. These electrically conductive agents may be used individually by 1 type, and may be used in combination of 2 or more type. Further, the blending amount of these conductive agents is not particularly limited, but is preferably in the range of 5 to 40% by mass, more preferably in the range of 5 to 20% by mass with respect to the entire high-rigidity resin composition.

The outer diameter of the shaft 1 is preferably in the range of 5 to 20 mm, particularly 5 to 10 mm. In addition, when a resin material is used for the shaft 1, there is an advantage that an increase in the mass of the shaft 1 can be suppressed even if the outer diameter of the shaft 1 is increased.

Further, the base layer 2 can be formed of rubber or resin, or a foam (foam) thereof. Specifically, for example, polyurethane, polyester-based or styrene-based thermoplastic elastomer, silicone rubber, fluorine rubber, butadiene rubber (BR), isoprene rubber, chloroprene rubber (CR), styrene-butadiene rubber (SBR), ethylene-propylene Rubber (IR), polynorbornene rubber, styrene-butadiene-styrene rubber, epichlorohydrin rubber (ECO), ethylene-propylene-diene rubber (EPDM), acrylonitrile-butadiene rubber (NBR), natural rubber (NR), butyl rubber (IIR), Examples thereof include rubber compositions using acrylic rubber, ethylene-vinyl acetate copolymer (EVA) and a mixture thereof as a base rubber, and foams thereof.

Among these, the polyurethane is not particularly limited, and any polyurethane may be used as long as it is obtained by reacting a polyol component and an isocyanate component and has a urethane bond in the resin.

Examples of the polyol component constituting the polyurethane include polyether polyol, polyester polyol, polymer polyol, polytetramethylene ether glycol, polycarbonate diol, castor oil-based polyol, etc., and one or more of these may be used. it can. Among these, polyether polyols composed of propylene oxide (PO) and ethylene oxide (EO), and polymer polyols containing polystyrene and / or polyacrylate are particularly preferably used.

Also, the isocyanate component is not particularly limited, but tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), naphthalene diisocyanate (NDI), norbornene diisocyanate (NBDI). ) And modified products thereof, and one or more of them can be used. Among these, modified TDI, modified MDI, and modified HDI are particularly preferably used, and specifically, polyol-modified TDI, polyol-modified MDI, and polyol-modified HDI are preferably used.

Here, although not particularly limited, the NCO content of these isocyanates is preferably 1 to 25%, and when the NCO content is less than 1%, the reaction is slow and curing takes time. End up. Further, crosslinking is likely to be insufficient, and unreacted components are likely to exude as a contaminant. On the other hand, if it exceeds 25%, the reaction becomes too fast and it may be difficult to inject into the mold at the time of molding.

It is preferable to adjust the conductivity by blending the base layer 2 with a conductive agent. As the conductive agent, known ionic conductive agents and electronic conductive agents can be used as appropriate. Among these, as the ionic conductive agent, tetraethylammonium, tetrabutylammonium, dodecyltrimethylammonium (for example, lauryltrimethylammonium), hexadecyltrimethylammonium, octadecyltrimethylammonium (for example, stearyltrimethylammonium), benzyltrimethylammonium, modified fatty acid dimethylethyl Perchlorates such as ammonium, chlorates, hydrochlorides, bromates, iodates, borofluorides, sulfates, ethyl sulfates, carboxylates, ammonium salts such as sulfonates, lithium, Sodium, potassium, calcium, magnesium, etc. alkali metal, alkaline earth metal perchlorate, chlorate, hydrochloride, bromate, iodate, borofluoride, sulfate, trifluoro Methyl sulfate, sulfonate, and the like. 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 color for which oxidation treatment is applied. Carbon black, pyrolytic carbon black, natural graphite, artificial graphite, antimony-doped tin oxide, ITO, tin oxide, titanium oxide, zinc oxide and other metal oxides, nickel, copper, silver, germanium and other metals, polyaniline, polypyrrole, Examples include conductive whiskers such as conductive polymers such as polyacetylene, carbon whiskers, graphite whiskers, titanium carbide whiskers, conductive potassium titanate whiskers, conductive barium titanate whiskers, conductive titanium oxide whiskers, and conductive zinc oxide whiskers. Et That.

In addition, an appropriate amount of known additives such as a foam stabilizer, a crosslinking agent, a foaming agent (water, low-boiling substances, gas bodies, etc.), a surfactant, a catalyst, and the like may be added to the base layer 2 as necessary. Can do. Of these, examples of the foam stabilizer include silicone foam stabilizers (such as block copolymers of dimethylpolysiloxane and polyether) and polydimethylsiloxane-polyethylene oxide copolymers. Examples of the catalyst include, for example, organometallic catalysts dibutyltin dilaurate, dibutyltin diacetate, stannous octoate, dibutyltin marker peptide, dibutyltin thiocarboxylate, dibutyltin dimalenate, dioctyltin marker peptide, dioctyltin thiocarboxylate. Rate, phenylmercury, silver propionate, tin octenoate, amine-catalyzed triethylamine, N, N, N ′, N′-tetramethylethylenediamine, triethylenediamine, N-methylmorpholine, dimethylaminoethanol, bis (2-dimethylamino) Ethyl) ether, 1,8-diazabicyclo (5,4,0) -undecene-7 and the like are preferably used. These catalysts may be used alone or in combination of two or more.

The developing roller of the present invention can be produced by sequentially forming the base layer 2 and the coating layer 3 on the outer periphery of the shaft 1 using the above-mentioned base layer and coating layer forming materials.

In the present invention, when the base layer is formed of a foam, the foaming method includes either a method of chemically foaming using a foaming agent or a mechanical flossing method in which air is mechanically entrained and foamed like polyurethane foam. May be used. Specifically, for example, a material obtained by foaming a base layer forming raw material by mechanical stirring is poured into a cylindrical mold in which a shaft is arranged in advance, and the base layer is supported on the outer periphery of the shaft by reaction curing. it can. Then, the roller of this invention is producible by apply | coating the raw material for forming a coating-film layer on this base layer, and irradiating with an ultraviolet-ray.

The method for producing a developing roller of the present invention is characterized in that the coating layer is formed by applying the above-mentioned paint by roll coating. In FIG. 3, the schematic explanatory drawing which shows the formation method of the coating film layer by roll coating is shown. The illustrated roll coater 20 includes a coating roll 21 disposed so as to be immersed in the paint stored in the paint tank 22, and a drive motor (not shown) that rotationally drives the coating roll 21. The surface of the coating roll 21 in the roll coater 20 is in contact with or close to the surface of the base layer 2 that is the object to be coated. The coating material carried on the peripheral surface is applied to the surface of the base layer 2. In addition, a fine gravure-like uneven surface can be formed on the peripheral surface of the coating roll 21. In addition, the code | symbol 23 in a figure shows the braid | blade which removes a coating material from the surface of the coating roll 21 in order to suppress the excessive transfer of the coating material to the surface of the coating roll 21. FIG.

As shown in the figure, in the present invention, the shaft 1 provided with the base layer 2 on the outer periphery is supported on the surface of the base layer 2 while being traversed in the axial direction while being supported by both ends of the shaft 1 and rotated by a drive motor or the like. The coating layer 3 can be applied by applying a coating to the surface of the base layer 2 by the coating roll 21 of the roll coater 20 that comes into contact. Here, the shaft of the coating roll 21 and the shaft 1 can be arranged so as to intersect at a predetermined crossing angle that can be set as appropriate, whereby the base layer is brought into point contact with the surface of the coating roll 21 and the surface of the base layer 2. The coating is applied on the surface of 2 in a spiral shape, uniformly and with little uneven coating. If the crossing angle is reduced, the width of the spiral coating film can be increased. In this case, the shaft 1 side may be rotated only and the roll coater 20 side may be configured to be traversable. There is no restriction | limiting in particular about the formation conditions of the coating film layer by the roll coat in this invention, According to a conventional method, it can implement.

In the present invention, examples of the ultraviolet light source used for curing the coating layer include a mercury lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, a metal halide lamp, and a xenon lamp. With respect to the conditions for ultraviolet irradiation, the irradiation intensity, the integrated light amount, and the like can be appropriately adjusted according to the components contained in the paint, the coating amount, and the like, and there is no particular limitation.

Hereinafter, the present invention will be described in more detail with reference to examples.
First, polyurethane foam (outer diameter 16 mm) as a base layer was supported on the outer periphery of the shaft (outer diameter 8 mm) using a cylindrical mold. Next, a coating layer having a film thickness of about 2 μm was formed on the outer periphery of the base layer by roll coating using a coating composition having the composition shown in the following table, and developing rollers of the examples and comparative examples were produced.

(Thickness measurement method)
Each developing roller 10 obtained was cut with a width of 1 to 2 mm perpendicular to the longitudinal direction of the roller using a cutter blade (see FIG. 4). Cuts were made in a direction perpendicular to the cuts, and sections of each developing roller were cut out. This slice was observed at a magnification of 5000 using a digital microscope VHX-2000 manufactured by Keyence, and the film thickness of the coating layer was determined by measuring the distance between two points. Six points of film thickness were determined for each slice, and the average value of the determined film thicknesses was defined as the film thickness value. The results are also shown in the table below.

(Repel evaluation)
About each obtained developing roller, the presence or absence of the repelling of the coating material of a coating film layer was evaluated based on the following evaluation criteria. The results are also shown in the table below.
1: NG
2: OK (when the repelled portion is less than 40% of the surface area of the roller)
3: OK (when the repelled portion is less than 20% of the surface area of the roller)
4: OK (when the repelled portion is less than 10% of the surface area of the roller)
5: OK (when there is no repelled part)

(Cross cut test)
For each of the obtained developing rollers, the adhesion between the base layer and the coating layer was evaluated according to a cross-cut test of JIS method (JIS K 5600-5-6: 1999). Specifically, using a predetermined jig, a total of 25 grids are cut and formed with a razor (manufactured by Gillette), 5 in each of the developing rollers in length and breadth, and cello tape (registered trademark) is formed on the grids. After pasting, it was peeled off at once, whether or not the grids were peeled off, and the number of grids that were not peeled off was counted. The results are also shown in the table below.

* 1) Ketjen black dispersion: (solid content 6% by weight, DBP oil absorption 450-550 ml / 100 g, DBP oil absorption 0.3-0.5 ml / m ² per nitrogen adsorption specific surface area)
* 2) Acetylene black dispersion: (solid content 25% by weight, DBP oil absorption 150-200 ml / 100 g, DBP oil absorption 0.5-0.7 ml / m ² per nitrogen adsorption specific surface area)
* 3) Silica gel: AEROSIL R711 (manufactured by Evonik Japan Co., Ltd., solid content 100% by mass, average secondary particle size 12 nm)
* 4) Nano silica gel: BYK3650 (Bic Chemie Japan Co., Ltd., solid content 25% by mass, average secondary particle size 20 to 25 nm)
* 5) X22-2458: Shin-Etsu Silicone Co., Ltd. * 6) Novec7100: Fluorine solvent, 3M Japan Co., Ltd. * 7) IRGACURE907: 2-methyl-1- (4-methylthiophenyl) -2-morpholinopro Pan-1-one, manufactured by BASF Japan Ltd. * 8) IRGACURE819: Bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, manufactured by BASF Japan Ltd.

As shown in the above table, when a coating layer is formed on the surface of the base layer using a roll coat, it contains an ultraviolet curable resin and has a TI value and viscosity within a predetermined range or contains a predetermined thixotropic material. By using a paint and keeping the film thickness of the coating layer within a predetermined range, it is possible to suppress the repelling and provide the coating layer with a uniform thickness, and to ensure good adhesion between the base layer and the coating layer. It became possible to do.

DESCRIPTION OF SYMBOLS 1 Shaft 2 Base layer 3 Coating layer 10 Developing roller 11 Toner supply roller 12 Photosensitive drum 13 Toner 14 Layering blade 15 Transfer part 16 Cleaning part 17 Cleaning blade 20 Roll coater 21 Coating roll 22 Paint tank 23 Blade

Claims (7)

1. In the developing roller that sequentially includes a base layer and a coating layer on the outer periphery of the shaft,
   The coating layer is formed from a coating containing an ultraviolet curable resin, and the coating layer has a thixotropic index of 1.0 to 3.0, a viscosity of 5 to 600 cp, and the coating layer. A developing roller having a film thickness of 0.5 to 12 μm.
2. In the developing roller that sequentially includes a base layer and a coating layer on the outer periphery of the shaft,
   The coating layer is formed from a paint containing an ultraviolet curable resin, and the paint has a DBP oil absorption of 150 to 550 ml / 100 g and a DBP oil absorption of 0.3 to 0.7 ml per nitrogen adsorption specific surface area. / m ² and is carbon black, and contains at least one thixotropic material secondary particle size is selected from among silica 0.01 ~ 3 [mu] m, and the thickness of the coating film layer 0. A developing roller having a thickness of 5 to 12 μm.
3. The paint has carbon black having a DBP oil absorption of 150 to 550 ml / 100 g and a DBP oil absorption of 0.3 to 0.7 ml / m ² per nitrogen adsorption specific surface area, and a secondary particle size of 0.1. 2. The developing roller according to claim 1, comprising at least one thixotropic material selected from 01 to 3 μm silica.
4. The developing roller according to claim 2, wherein the paint has a thixotropic index of 1.0 to 3.0 and a viscosity of 5 to 600 cp.
5. The developing roller according to claim 1 or 2, wherein the ultraviolet curable resin has an ester skeleton.
6. The developing roller according to claim 1 or 2, wherein the coating contains 1 to 15 parts by mass of the thixotropic material with respect to 100 parts by mass of the ultraviolet curable resin.
7. 3. A method for producing a developing roller according to claim 1 or 2, wherein the coating is applied by roll coating.

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