JPH11351238A - Electrical conductive roller and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent particulates from setting by including at least one sort selected from among fatty acid amid, high-molecular fatty acid amide, fatty acid ester polymer, and polyethylene oxide, and particulates in the at lest outermost layer of a resin layer. SOLUTION: An electrical conductive roller 1 is constituted so that an electrical conductive elastic layer 3 of JIS A hardness of the elastic layer itself under 80 deg.C is coaxially provided around an electrical conductive shaft 2 made of stainless steel, an aluminum alloy, electrical conductive resin or the like, and the outer circumferential face is covered with a surface layer 4 of thickness under 100 μm. In the surface layer 4, the adding quantity of at least one sort selected from fatty acid amide, high-molecular fatty acid amide, fatty acid ester polymer, and polyethylene oxide, is set to be 0.3-10 pts.wt. against the surface layer base resin 100 pts.wt., and the adding quantity of partuculates is 10-50 pts.wt. For regulating surface roughness, average grain size is desirably set to be 10-50 μm, dipping or spray atomization is desirable as the forming method of the surface layer 4. This constitution prevents particulates in the surface layer solution from settling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive rubber roller (a charging roller, a developing roller, a transfer roller, and the like) incorporated in an electrophotographic apparatus such as a copying machine, a printer, or a facsimile receiving apparatus, and a method of manufacturing the same. .

[0002]

2. Description of the Related Art Hitherto, urethane rubber, NBR, EPR, silicone rubber, and the like have been used for manufacturing parts requiring conductivity in rollers used for electrophotography utilizing electrostatic force. In a conductive roller having a configuration in which only the outer periphery of a conductive shaft or the like is coated with the rubber having conductivity, a layer in which it is difficult to satisfy a balance between both properties of flexibility and non-adhesion is required. It is difficult to mass-produce by controlling the electrical resistance, and it is difficult to meet the characteristics required for the outermost surface because it is a flexible rubber that greatly increases the cost even if mass production is possible. Even if the number of processes increases, the cost will be reduced as a result, and a conductive roller with a configuration in which one or more resin layers are formed on a conductive rubber layer to make a conductive roller that meets higher level required quality Are being considered.

[0003]

Means for forming the surface layer, which is the outermost layer of the resin layer of the conductive roller having a plurality of layers, include preparing a surface layer solution (solvent and water), dipping, spraying, and rolling. There are a method of applying a coater and a method of coating a tube or the like. In the case of a method of applying a surface layer solution, fine particles are often added for the purpose of controlling the surface roughness of the surface layer and the like, but in this case, sedimentation of the fine particles is a major problem.

[0004]

Means for Solving the Problems As means for preventing the particles from settling as described above and providing a conductive roller having the characteristics required for the outermost surface of the conductive roller, a) the additives are added in a solution stationary state. Are affected by the intermolecular force, etc., and under the conditions of actual application, a compound that loses the intermolecular force is added to prevent particle sedimentation. B) Among the additives in a), the additive does not bleed and is required for the conductive roller. As a result of intensive studies from the viewpoint of using a compound satisfying the required characteristics as an additive, the present invention has been achieved. That is, in the conductive roller formed by concentrically laminating an elastic layer around the conductive shaft and one or more resin layers on the elastic layer, at least the outermost layer (surface layer) of the resin layer is a fatty acid. Conductive roller comprising at least one selected from amide, high-molecular fatty acid amide, fatty acid ester polymer, polyethylene oxide and fine particles (claim 1) Fatty acid amide, high-molecular fatty acid amide, fatty acid according to claim 1 The addition amount of at least one selected from the group consisting of an ester polymer and polyethylene oxide is 0.3 to 10 parts by weight based on 100 parts by weight of the surface layer base resin, and the addition amount of the fine particles is 100 parts by weight based on the surface layer base resin. 2. The developing roller according to claim 1, wherein the average particle diameter of the fine particles is 10 to 50 μm. 3. The developing roller according to claim 1, wherein the elastic layer contains (A) at least one alkenyl group in the molecule, and the repeating unit constituting the main chain is mainly oxyalkylene. A polymer consisting of units or saturated hydrocarbon units,
(B) a curable composition containing at least two hydrosilyl groups in a molecule, (C) a hydrosilylation catalyst, and (D) a conductivity-imparting agent as a main component. The conductive roller according to any one of claims 1 to 3, wherein the surface layer is formed by applying the surface layer by any of dipping and spraying. The conductive roller according to any one of claims 1 to 4, wherein the surface layer includes a step of being formed by applying the surface layer by any of dipping and spraying. The present invention relates to a method for producing a conductive roller according to any one of claims 1 to 4 (claim 6).

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; The conductive roller 1 according to the present invention has a SUS having a diameter of about 1 mm to 25 mm,
Around the conductive shaft 2 made of an aluminum alloy or a conductive resin, the elastic layer itself has a JIS A hardness of 8
0 ° or less, preferably 50 ° or less, more preferably 30 ° or less.
° or less conductive elastic layer 3 is provided concentrically, and the outer peripheral surface of this conductive elastic layer 3 is covered with a predetermined thickness of 100 μm or less, preferably 10 to 50 μm. is there. The surface layer 4 contains at least one of fatty acid amide, high-molecular fatty acid amide, fatty acid ester polymer, polyethylene oxide and fine particles. Here, between the conductive elastic layer 3 and the surface layer 4,
A resistance adjusting layer for adjusting the electric resistance of the conductive roller,
And a single layer or a plurality of layers such as a primer layer for improving the adhesion between the conductive elastic layer and the surface layer. When used as a developing roller, it preferably contains particles having an average particle size of 10 μm to 50 μm in order to adjust the surface roughness. Examples of the method of forming the surface layer 4 include, depending on the viscosity of the surface layer solution, dipping, spray spraying, roll coating, brush coating, and the like. However, dipping and spraying are performed in that a 50 μm surface layer can be uniformly applied. preferable. In the case of the charging roller and the developing roller, the conductive roller as described above has a roller resistance after coating the surface layer of 10 ⁴ to 10 ¹⁰ Ω, preferably 10 ⁵ to 10 ⁸ Ω.
Setting does not damage the photoconductor,
It is preferable in that a good image is obtained. In the case of a transfer roller, it is preferably 10 ⁷ to 10 ¹² Ω from the viewpoint of favorably transferring the toner on the photoconductor. The roller resistance value is determined by applying a conductive roller horizontally to a metal plate and applying a load of 500 g to each of both ends of the conductive shaft in the direction of the metal plate. It is a value measured with volts applied.

Hereinafter, the structure of the surface layer will be described more specifically. The surface layer used in the present invention contains at least one compound selected from fatty acid amides, high-molecular fatty acid amides, fatty acid ester polymers, and polyethylene oxide, and also contains fine particles added for controlling surface properties and charging properties. There is no special provision as long as The high-molecular fatty acid amide referred to herein is a fatty acid amide obtained by reacting a fatty acid amide with dimer acid, trimer acid, or the like, and having a high molecular weight. Interaction between amide bonds in a solution is involved in preventing precipitation. The points are the same as those of the fatty acid amide. The fatty acid ester polymer is a polymer obtained by reacting a fatty acid and a polyfunctional polymer, but partially contains a carboxyl group, and since this carboxyl group contributes to precipitation, a solution containing a pigment or the like is used. In this case, the carboxyl groups are oriented to the pigment, which is more effective.

The amount of the fatty acid amide, high molecular weight fatty acid amide, fatty acid ester polymer and polyethylene oxide is preferably 0.3 to 10 parts by weight based on 100 parts by weight of the surface layer base resin. When the amount is less than 0.3 parts by weight, the effect of preventing sedimentation is often small. On the other hand, if the amount is more than 10 parts by weight, the viscosity of the solution is increased and uneven coating is caused, and the characteristics of the surface layer are changed. The amount is more preferably from 0.5 to 5 parts by weight, most preferably from 1 to 2 parts by weight, in terms of the balance between the prevention of sedimentation and the reduction in viscosity rise.

By the way, the conductive roller is used for various kinds of rollers. In the case of a charging roller, the withstand voltage performance and the surface smoothness are important.
Preferably, the resin has a thickness of 50 to 100 μm and hardly generates citron skin or the like. Therefore, as the base resin of the surface layer, water-based urethane, hydrocarbon-based resin and the like are preferable.

[0009] In the case of the developing roller, -NHCO-
Bond-containing resins are preferred. Surface roughness is 3-20μ in Rz
m, preferably 5 to 10 μm, from the viewpoint of toner transportability and the like. Therefore, when fine particles are contained, the average particle diameter is 10 to 50 μm, preferably 10 to 30 μm.
m is preferred.

In the case of a transfer roller, a PC used for printing
There are a case where a portion which comes into contact with paper and a fluorine-containing rubber or the like which is excellent in releasability from the paper is preferable, and a case where urethane rubber or the like which has appropriate adhesiveness is preferable. The fine particles according to the present invention are not particularly limited except for the average particle diameter, and may be either organic or inorganic. Examples of the inorganic fine particles include titanium oxide, magnesium oxide, aluminum hydroxide, magnesium hydroxide, and silica. Organic fine particles are preferred in terms of low specific gravity and maintenance of mechanical properties of the surface layer. Fine particles, urethane-based fine particles, hydrocarbon-based fine particles, nylon-based fine particles, a mixed system of the fine particles,
A mixed system based on composition in copolymerization or the like can be used. Of these, urethane-based fine particles are preferred from the viewpoint of toner charging properties and availability.

The filling amount of the fine particles is preferably 10 to 50 parts by weight based on 100 parts by weight of the surface layer base resin.
Less than 10 parts by weight makes it difficult to control the surface roughness,
If it is more than 50 parts by weight, the surface layer becomes brittle. In terms of stably controlling the surface roughness, 20 to 30 parts by weight is more preferable. The conductive composition according to claim 4 will be described.
As the conductive elastic layer, (A) a polymer containing at least one alkenyl group in a molecule and having a main chain composed mainly of oxyalkylene units or saturated hydrocarbon units, and (B) A) a curable composition containing at least two hydrosilyl groups in the molecule, (C) a hydrosilylation catalyst, and (D) a conductivity-imparting agent. preferable. When the conductive elastic layer is made of an oxyalkylene-based composition, the composition has a low viscosity before curing and has a low hardness after curing, so that it is preferable from the viewpoint of workability. When composed of a system composition, this composition has a low water absorption, and is therefore preferable from the viewpoint of stability in a high humidity environment.

The polymer of the component (A) in the curable composition is a component which is cured by a hydrosilylation reaction with the component (B), and has at least one alkenyl group in the molecule. Occurs to become a polymer and harden. The number of alkenyl groups contained in the component (A) is required to be at least one from the viewpoint of performing a hydrosilylation reaction with the component (B), but from the viewpoint of rubber elasticity, in the case of a linear molecule, In the case of a molecule having two alkenyl groups at both ends and a branched molecule, it is preferable that two or more alkenyl groups are present at the molecular ends. (A)
The main repeating unit constituting the main chain of the component is an oxyalkylene unit or a saturated hydrocarbon unit.

In the case of a polymer in which the main repeating unit constituting the main chain is an oxyalkylene unit, the volume resistivity is 10 ⁸ to 10 ⁹ Ωcm only by adding a small amount of a conductivity-imparting agent.
Is preferable. Further, from the viewpoint of lowering the hardness of the cured product, an oxyalkylene-based polymer in which the repeating unit is an oxyalkylene unit, and more preferably an oxypropylene-based polymer in which the repeating unit is an oxypropylene unit.

Here, the oxyalkylene polymer refers to a polymer in which 30% or more, preferably 50% or more, of the units constituting the main chain are composed of oxyalkylene units. Examples of the unit include compounds having two or more active hydrogens, such as ethylene glycol, bisphenol compounds, glycerin, trimethylolpropane, and pentaerythritol, which are used as a raw material during the production of a polymer. . In the case of an oxypropylene-based polymer, it may be a copolymer (including a graft polymer) with a unit composed of ethylene oxide, butylene oxide, or the like.

The molecular weight of the oxyalkylene polymer as the component (A) is from 500 to 50,000 in terms of number average molecular weight (Mn) from the viewpoint of improving the balance between reactivity and hardness reduction. Is 1,000-40,0
00, particularly preferably 5,000 to 40,000. When the number average molecular weight is less than 500, it becomes difficult to obtain sufficient mechanical properties (rubber hardness, elongation) and the like when the curable composition is cured. On the other hand, if the number average molecular weight is too large, the molecular weight per alkenyl group contained in the molecule will be large, or the reactivity will decrease due to steric hindrance, so curing is often insufficient, Further, the viscosity tends to be too high and the processability tends to be poor.

The alkenyl group contained in the oxyalkylene polymer is not particularly limited, but may be represented by the following general formula (1): H ₂ C ＝ C (R ¹ )-(1) (wherein R ¹ is a hydrogen atom or The alkenyl group represented by (methyl group) is particularly preferable in terms of excellent curability.

One of the features of the curable composition is that
In order to exhibit this characteristic, the number of alkenyl groups is preferably 2 or more at the molecular terminal, and the number of alkenyl groups becomes too large compared to the molecular weight of component (A). And it becomes difficult to obtain good rubber elasticity. In the case where the component (A) is a polymer in which the main repeating unit constituting the main chain is a saturated hydrocarbon-based unit, the polymer preferably has a low water absorption and a small environmental fluctuation of electric resistance. This polymer is also a component which is cured by a hydrosilylation reaction with the component (B), as in the case of the oxyalkylene polymer, and has at least one alkenyl group in the molecule. The component (A) is required to have at least one alkenyl group from the viewpoint of a hydrosilylation reaction with the component (B).
From the viewpoint of rubber elasticity, in the case of a linear molecule, two molecules are preferably present at both ends of the molecule, and in the case of a molecule having a branch, two or more molecules are preferably present at the molecular terminal.

Representative examples of the polymer in which the main repeating unit constituting the main chain is a saturated hydrocarbon-based unit include:
Examples include an isobutylene-based polymer, a hydrogenated isoprene-based polymer, and a hydrogenated butadiene-based polymer. These polymers may contain a repeating unit of another component such as a copolymer, but at least 50% of a saturated hydrocarbon-based unit may be contained.
As described above, it is important that the content is preferably 70% or more, more preferably 90% or more, so as not to impair the characteristic of the saturated hydrocarbon system having a low water absorption.

The molecular weight of the polymer of the component (A) in which the main repeating unit constituting the main chain is a saturated hydrocarbon-based unit may be a number average molecular weight (M
n) about 500 to 50,000, and even 1,000
~ 15,000, and a liquid material having fluidity at room temperature is preferable from the viewpoint of processability. About the alkenyl group introduced into this saturated hydrocarbon polymer,
The same applies to the case of the oxyalkylene polymer.

Therefore, preferred specific examples of the polymer having at least one alkenyl group in the molecule and having a main repeating unit constituting a main chain of a saturated hydrocarbon as the component (A) include: A linear number average molecular weight (Mn) having two alkenyl groups at both ends is from 2,000 to 1
Examples thereof include a polyisobutylene-based, hydrogenated polybutadiene-based, and hydrogenated polyisoprene-based polymer having a molecular weight of 5,000 and an Mw / Mn of 1.1 to 1.2.

The component (B) in the curable composition is not particularly limited as long as it is a compound having at least two hydrosilyl groups in the molecule, but the number of hydrosilyl groups contained in the molecule is too large. After curing, a large amount of hydrosilyl groups easily remain in the cured product and cause voids and cracks. Therefore, the number of hydrosilyl groups contained in the molecule is preferably 50 or less. Further, the number is preferably 2 to 30, more preferably 2 to 20, from the viewpoint of control of rubber elasticity and storage stability of the cured product. Further, in order to easily prevent foaming during curing, 20 Hereinafter, three or more are preferable in that hardening failure hardly occurs even when the hydrosilyl group is deactivated, and the most preferable range is 3 to 20.

In the present invention, the above-mentioned hydrosilyl group is
The term “having one” means having one H bonded to Si. In the case of SiH ₂ , it has two hydrosilyl groups, but the H bonded to Si is harder to bond to different Si. And also preferable from the viewpoint of rubber elasticity.
The molecular weight of the component (B) is determined by the conductivity imparting agent ((D)) described later.
Component), the number average molecular weight (Mn) is preferably 30,000 or less, more preferably 20,000 or less, particularly preferably 15, 000 or less, from the viewpoints of dispersibility and roller processability when adding (Component).
000 or less is preferable. Considering the reactivity and compatibility of the component (A), 300 to 10,000 is preferable.

Regarding the component (B), since the cohesive force of the component (A) is greater than the cohesive force of the component (B), the phenyl group-containing modification is important in terms of compatibility. Styrene-modified products are preferred from the viewpoint of compatibility with the components and availability, and α-methylstyrene-modified products are preferred from the viewpoint of storage stability. The hydrosilylation catalyst as the component (C) is not particularly limited as long as it can be used as a hydrosilylation catalyst. Platinum simple substance, solid platinum supported on simple substance such as alumina, chloroplatinic acid (including complex such as alcohol), various complexes of platinum, rhodium,
Chloride of metals such as ruthenium, iron, aluminum, titanium and the like can be mentioned. Among these, chloroplatinic acid, a platinum-olefin complex, and a platinum-vinylsiloxane complex are preferable from the viewpoint of catalytic activity. These catalysts may be used alone or in combination of two or more.

The proportion of the components (A) and (B) used in the curable composition as described above is such that the amount of the hydrosilyl group in the component (B) is 0.2 per mole of the alkenyl group in the component (A). -5.0 mol, more preferably 0.4-2.5 mol, from the viewpoint of rubber elasticity. The amount of the component (C) used is 1 to 1 mole of the alkenyl group in the component (A).
It is preferably used in the range of 0 ^-8 to 10 ^-1 mol, more preferably 10 ^-6 to 10 ^-1 mol, particularly preferably 10 ^-6 to 10 ^-3 mol.
If the charge of the component (C) is less than 10 ^-8 mol, the reaction does not easily proceed. On the other hand, hydrosilylation catalysts are generally expensive and have a corrosive, and since the cured product hydrogen gas generate a large amount has a property that results in foaming greater than 10 ^-1 mol It is preferable not to use them.

Further, the curable composition as described above has
If a conductive composition is obtained by adding a conductivity-imparting agent as the component (D), it is suitable as a developing roller. Examples of the conductivity-imparting agent of the component (D) include carbon black, metal fine powder, and organic compounds having a quaternary ammonium base, a carboxylic acid group, a sulfonic acid group, a sulfate group, a phosphate group, and the like. Or a polymer, an ether ester amide, or an ether imide polymer, an ethylene oxide-epihalohydrin copolymer, a compound having a conductive unit represented by methoxypolyethylene glycol acrylate, or an antistatic agent such as a polymer compound, Examples of the compound include a compound that can impart conductivity. These conductivity imparting agents may be used alone or in combination of two or more.

The added amount of the conductivity-imparting agent as the component (D) is preferably not more than 30% by weight based on the total amount of the components (A) to (C), from the viewpoint of not increasing the rubber hardness.
On the other hand, from the viewpoint of obtaining a uniform resistance, the content is preferably 10% by weight or more. The required rubber hardness and the volume resistivity of the cured product are 10 ³
The amount of addition may be determined from the balance of the physical properties so as to be 10 ¹⁰ Ωcm.

Further, in addition to the components (A) to (D), a storage stability improver such as a compound having an aliphatic unsaturated bond, an organic phosphorus compound, an organic sulfur compound, A nitrogen-containing compound, a tin-based compound, an organic peroxide, or the like may be added. Specific examples thereof include, for example, benzothiazole, thiazole, dimethylmalate, dimethylacetylenecarboxylate,
Examples include, but are not limited to, 2-pentenenitrile, 2,3-dichloropropene, quinoline, and the like. Among these, thiazole and dimethyl malate are particularly preferred from the viewpoint of achieving both pot life and rapid curing properties. The storage stability improvers may be used alone or in combination of two or more.

The curable composition may contain a filler, a storage stabilizer, a plasticizer, an ultraviolet absorber, a lubricant, a pigment, etc. for improving processability and cost. The developing roller according to the present invention is a conductive shaft made of a curable composition as described above, or an elastic material such as urethane rubber, chloroprene rubber, or EP rubber, for example, a metal shaft made of SUS or the like at the center. The conductive elastic layer is formed around the shaft by casting, injecting, extruding, etc., into a mold provided with, and heat-curing at an appropriate temperature and time. In this case, post-curing may be performed after semi-curing.

A method of manufacturing the conductive roller according to the fifth aspect of the present invention and the conductive roller according to the sixth aspect will be described. Claims 5 and 6 of the present invention are not particularly limited as long as they are a conductive roller having a surface layer formed by applying a surface layer solution by dipping and spraying and then drying (including curing) to form a surface layer, and a method for producing the same. However, the average particle size of the fine particles is 10 μm to 5 μm.
It is effective for preventing sedimentation when it is relatively large as 0 μm.

[0030]

EXAMPLES Specific examples 1 to 13 and comparative examples 1 to 4 of the developing roller according to the present invention will be described below. Examples 1 to 13
The conductive rollers according to Comparative Examples 1 to 4 have a diameter of 10 m.
A conductive elastic layer having a thickness of about 7.5 mm is provided around a SUS shaft having a length of m and the outer surface of the conductive elastic layer is covered with a surface layer. Hereinafter, specific configurations of the conductive elastic layer and the surface layer will be described. These examples do not limit the present invention in any way. The conductive elastic layer is provided around the shaft using any of the elastic layers 1 to 3 listed below. (Conductive Elastic Layer 1) (A-1) Allyl-terminated polyoxypropylene polymer having a number average molecular weight (Mn) of 8000 and a molecular weight distribution of 2: 100
(B-1) polysiloxane-based curing agent (SiH value 0.36
(Mol / 100 g): 6.6 parts by weight (C) 10% isopropyl alcohol solution of chloroplatinic acid: 0.06 parts by weight (D-1) Carbon black 3030B (manufactured by Mitsubishi Chemical Corporation): 7 parts by weight, Decompression (10 mmHg or less, 1
20 minutes) Defoamed. The resulting composition was coated around the shaft and cured by leaving it in a mold at 120 ° C. for 30 minutes. The elastic layer itself had a JIS A hardness of 15 ° measured according to the method described in JIS K6301A method. (Conductive Elastic Layer 2) (A-2) A polyisobutylene polymer having an average of two vinyl groups at the terminal having a number average molecular weight (Mn) of 10,000: 10
0 parts by weight, (B-2) a polysiloxane-based curing agent (SiH value 0.97)
(Mol / 100 g): 2.7 parts by weight (C) 10% isopropyl alcohol solution of chloroplatinic acid: 0.06 parts by weight (D-2) Carbon black 3050B (manufactured by Mitsubishi Chemical Corporation): 5 parts by weight (others) Plastic Agent PS-32 (made by Idemitsu Kosan Co., Ltd.): A composition comprising 75 parts by weight was molded in the same manner as the conductive elastic layer 1. The JIS A hardness of the conductive elastic layer 2 itself was 14 °. (Conductive rubber layer 3) C-4190 manufactured by Nippon Polyurethane Co.
(Main chain is polyether, NCO content 4.5%, viscosity 70
0 centipoise / 75 ° C.)
4,4'-methylene-bis-2-chloroaniline
An elastic layer 3 was formed in the same manner as the elastic layer 1 except that a composition consisting of 9 parts by weight and 0.8 parts by weight of Ketjen Black EC was mixed and the curing conditions were changed to 80 ° C. for 5 hours. The JIS A hardness of the conductive elastic layer 3 itself was 78 °. (Surface layers 1 to 14) Each of the coating solutions was applied to a roller made of the above-mentioned elastic material by dipping and dried at 80 ° C. for 1 hour to obtain a conductive roller. (Surface layer 1) A surface layer solution 1 obtained by diluting Heimulen NPU5 (a polyether polyurethane manufactured by Dainichi Seika Kogyo Co., Ltd.) with a mixed solvent of isopropyl alcohol and toluene at a 1/1 (weight ratio) to a solid content of 5% was prepared. Produced. (Surface layers 2 to 13) Predetermined amount of urethane fine particles Seika Seven UP based on 100 parts by weight of solids of HEIMUREN NPU5
0904 (average particle size: 12-17 μm, manufactured by Dainichi Seika Kogyo Co., Ltd.) with the above-mentioned mixed solvent so that the solid content concentration becomes 5%, a predetermined amount of the additives shown in Table 1 is added, and mixing and stirring (1500 rpm) For 1 hour) and the surface layer solution 2-13
I got In addition, all additives in Table 1 are products manufactured by Kyoeisha Chemical Co., and the amount of the additives is indicated by parts by weight of additive solids with respect to 100 parts by weight of solids of HEIMUREN NPU5.

[0031]

[Table 1]

(Surface Layer 14) A surface layer solution 14 was obtained in the same manner as the surface layer solution 3 except that the urethane fine particles were changed to Seika Seven UP0902 (average particle size: 30 to 40 μm, manufactured by Dainichi Seika Kogyo). Table 2 below shows the configurations of Examples 1 to 12 and Comparative Examples 1 to 4.

[0033]

[Table 2]

(Evaluation Items) 1) The sedimentation state of the urethane fine particles after the surface layer solution was allowed to stand for 2 days (room at 20 ° C.) was examined. (O: Not sedimented, X: Sedimented) 2) As a peripheral member contamination evaluation, a roller was pressed against the photoreceptor, and was put into a 50 ° C., 80% RH environment for 120 hours, taken out, and the surface of the photoreceptor was visually evaluated. did. (O: No change X: Imprint remains on the photoreceptor surface.) 3) A conductive roller was set at the developing roller position of a commercially available six-sheet machine, and a black solid image was printed. The 1000th sheet was examined for Macbeth density. (A: 1.4 or more ○: Uniform at 1.3 or more and less than 1.4
Δ: Uniform but less than 1.3 ×: Not uniform. Table 3 shows the evaluation results.

[0035]

[Table 3]

Example 13 A conductive roller similar to that of Example 1 was prepared and evaluated except that the method of forming the surface layer was spraying. The characteristics were almost the same as those in Example 1.

[0037]

As shown in Table 3, those containing fatty acid amide, high molecular weight fatty acid amide, fatty acid ester polymer and polyethylene oxide in the surface layer to which the fine particles are added can prevent precipitation of fine particles in the surface layer solution and have other characteristics. And a surface layer in which fine particles are uniformly dispersed can be formed. In particular, a developing roller having a surface layer to which a fatty acid amide-based compound is added can improve the toner charging property and obtain a good image.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a conductive roller according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 conductive roller 2 conductive shaft 3 elastic layer 4 surface layer

Claims (6)

[Claims] 1. A conductive roller comprising an elastic layer around a conductive shaft and one or a plurality of resin layers concentrically laminated on the elastic layer, at least an outermost layer (surface layer) of the resin layer. Wherein at least one selected from fatty acid amide, high-molecular fatty acid amide, fatty acid ester polymer, polyethylene oxide and fine particles are contained. 2. The surface layer base resin 10 according to claim 1, wherein at least one addition amount selected from the group consisting of fatty acid amide, high molecular weight fatty acid amide, fatty acid ester polymer and polyethylene oxide is used.
The amount is 0.3 to 10 parts by weight based on 0 parts by weight, and the amount of the fine particles is 10 to 10 parts by weight based on the surface layer base resin.
2. The developing roller according to claim 1, wherein the amount is 50 parts by weight. 3. The developing roller according to claim 1, wherein the fine particles have an average particle diameter of 10 to 50 μm. 4. A polymer in which the elastic layer contains at least one alkenyl group in the molecule of (A), and the repeating units constituting the main chain are mainly composed of oxyalkylene units or saturated hydrocarbon units; A curing agent containing at least two hydrosilyl groups in the molecule, (C) a hydrosilylation catalyst,
The conductive roller according to any one of claims 1 to 3, comprising a reaction product of a curable composition containing (D) a conductivity-imparting agent as a main component. 5. The conductive roller according to claim 1, wherein the surface layer is formed by coating by any of dipping and spraying. 6. The conductive roller according to claim 1, further comprising a step of forming the surface layer by applying one of dipping and spraying. Manufacturing method