JP2000145758A - Electrophotographic roller and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfy stable toner conveying performance, durability and image characteristics by providing an elastic layer having surface adhesive on the outer periphery of a conductive core, sticking particles on the outer periphery of the elastic layer, and then providing a single or a plurality of resin layers. SOLUTION: A developing roller 6 is constituted by concentrically providing an elastic layer 9 around a conductive core 8 having the diameter in the range of 1 to 12 mm and made of aluminum, conductive resin or the like, sticking particles by making use of adhesive of the elastic layer 9, and then coating a single or a plurality of resin layers 10 (where the outmost layer of the resin layer is a front layer) having the specified thickness in the range of 10 μm to 100 μm on the outer peripheral surface. In the size of a particle, the particle diameter may be selected from the range of 5 μm to 50 μm when the film thickness is set to 10 μm. A main component of the front layer may be composed of a resin component having the -NHCO- bond and having a repeated unit of -ROCO2- such as a polycarbonate skeleton.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a roller incorporated in an electrophotographic image forming apparatus such as a printer, a copying machine or a facsimile receiving apparatus.

[0002]

2. Description of the Related Art In an image forming apparatus adopting an electrophotographic system, a charging roller for uniformly charging the surface of an electrostatic latent image carrier and toner carrying an electrostatic latent image are provided around the electrostatic latent image carrier. Various rollers such as a developing roller for supplying to the body and a transfer roller for transferring the toner image to the recording paper are arranged. The method of carrying the toner on the surface of the developing roller and moving the toner to the electrostatic latent image is largely divided into a non-magnetic developing method and a magnetic developing method. The magnetic developing method is a method in which a magnetic toner is adhered to the surface of a developing roller by magnetic force, and the non-magnetic developing method is a method in which non-magnetic toner is adhered to the surface of a developing roller by electrostatic force without using magnetic force. is there. The non-magnetic developing method has attracted attention in recent years because it has the advantages that the toner can be easily colored and a good halftone image can be obtained in monochrome image formation, as compared with the magnetic developing method.

FIG. 1 is a schematic diagram showing an example of a developing device 1 disposed in an image forming apparatus employing a non-magnetic developing system and a photosensitive member 2 serving as an electrostatic latent image carrier. As the photoconductor 2, a negatively chargeable organic photosensitive drum or the like is used. The developing device 1 includes a toner container 4 for storing the non-magnetic toner 3, a regulating blade 5 provided in the toner container 4, a developing roller 6, a supply roller 7, and the like. The developing roller 6 is provided around a conductive support 8 such as a metal shaft.
In general, an elastic layer 9 having rubber elasticity is formed, and a resin layer 10 for improving the chargeability of the toner and preventing toner filming is coated around the elastic layer 9. The toner 3 in the toner container is supplied to the surface of the developing roller 6 by the supply roller 7 and then pressed by the regulating blade 5 to form a thin toner layer. When the toner becomes a thin toner layer, the toner is charged electrically and frictionally. The thin toner layer is electrostatically attracted to the electrostatic latent image on the surface of the photoreceptor 2 and becomes a toner image on the surface of the photoreceptor 2, thereby performing development.

[0004]

The developing roller is required to have a stable toner carrying property for keeping the image density uniform, and to have a durability by preventing the toner filming. Need to be adjusted. As means for adjusting the surface roughness, means for blasting the roller surface, roughening the inner surface of the mold in the elastic layer forming step and transferring as it is, or means for polishing after forming the elastic layer and thereafter providing a resin layer, resin layer Various methods are known, such as means for adding particles to a solution to be formed. However, the blast treatment of the roller surface has a problem that the cost is high and the blast particles remain non-uniformly on the roller surface to cause image defects. Further, it is difficult to uniformly form the inner surface of the cylindrical mold by means of roughening the inner surface of the mold, and the same applies to the roughness control by plating or spray coating on the inner surface of the cylindrical mold. And 10
If an attempt is made to obtain a surface roughness of not less than μm, a release failure occurs when the roller provided with the elastic layer is released from the mold. In addition, there is a problem that the polishing treatment after the formation of the elastic layer also increases the cost.

On the other hand, after forming the elastic layer, means for immersing the elastic layer in a resin solution containing particles and providing the resin layer can relatively easily obtain the desired roughness. It has been done. However, even in this method, there is a problem that the particles settle with the passage of time and the surface roughness varies between samples, or even in the same sample, the surface roughness becomes non-uniform due to slight differences in immersion conditions. I had it.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a roller which uniformly controls the surface roughness of the roller and satisfies stable toner transportability, durability and image characteristics.

[0007]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, have paid attention to stably adhering particles by utilizing the adhesiveness of an elastic layer constituting a roller. Thus, the present invention has been completed. That is, the present invention is a roller incorporated in an image forming apparatus employing an electrophotographic method, in which an elastic layer having surface adhesiveness is provided on the outer periphery of a conductive core, and particles are formed on the outer periphery of the elastic layer. A roller provided with one or more resin layers after the adhesion (claim 1).

The roller according to claim 1, wherein said adhered particles are selected from a polyurethane resin, a nylon resin, an acrylic resin, a fluorine resin, and a silicone resin.

3. The roller according to claim 1, wherein the ten-point average surface roughness (Rz) of the roller is in a range of 2 to 20 μm.

The surface adhesion of the elastic layer is JIS Z 0
237 (incline angle 30)
The roller according to any one of claims 1 to 3, wherein the temperature is in the range of 1 to 13 at 23 ° C.

(A) a polymer in which the elastic layer has at least one alkenyl group in the molecule and the repeating unit constituting the main chain is an oxyalkylene unit or a saturated hydrocarbon unit; Claims: A reaction product of a curing agent having at least two hydrosilyl groups in a molecule, (C) a hydrosilylation catalyst, and (D) a curable composition containing a conductivity-imparting agent as a main component. The roller according to any one of Items 1 to 4, (Claim 5).

An elastic layer having surface tackiness is provided on the outer periphery of the conductive core, and particles or particles are attached to the outer periphery of the elastic layer, and then one or more resin layers are provided. Manufacturing method (Claim 6).

7. The method according to claim 6, wherein at least a resin layer of the one or more resin layers that is in contact with the elastic layer is provided by a spraying method or a dipping method.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, various embodiments according to the present invention will be described.

The developing roller according to the present invention has a diameter of 1 to 12.
SUS of about mm, an elastic layer is provided concentrically around a conductive core made of aluminum or conductive resin,
After adhering particles using the adhesiveness of the elastic layer, the outer peripheral surface thereof is covered with a single or plural resin layers having a predetermined thickness of 10 μm to 100 μm (the outermost layer of the resin layer is referred to as a surface layer). Be composed.

The size of the particles used in the present invention can be appropriately selected from the desired surface layer thickness and surface roughness. For example, the optimum surface roughness for a developing roller is 3 to
When the film thickness is set to 15 μm and the film thickness is set to 10 μm, the particle diameter is preferably selected from the range of 5 μm to 50 μm. In the case of a toner supply roller, a transfer roller, etc., the surface roughness is 10 to 2
When 0 μm is appropriate and the thickness of the surface layer is set to about 100 μm, the particle size may be selected in the range of 50 to 150 μm.

The main component of the surface layer of the developing roller is not particularly limited, but contains an -NHCO- bond from the viewpoint of improving the charging characteristics of the negatively charged toner.
Further, from the viewpoint of the stability of the electrical resistance at the time of environmental change, it is sufficient that the resin composition has a main composition of a resin having a repeating unit of -ROCO _2- such as a polycarbonate skeleton. Even in the case of a blend resin with polycarbonate, -NHC is contained in one molecule.
Polycarbonate urethane having both units of an O-bond and a repeating unit of —ROCO ₂ — may be used.

The polycarbonate urethane includes:
It is preferable that the —R group of the —ROCO ₂ — skeleton is an alicyclic group or an alkyl group. Among these, it is preferable that the -R group be an alkyl group from the viewpoint that a low hardness and a low water absorption of the surface layer can be obtained in a well-balanced manner.

Further, the above-mentioned polycarbonate urethane comprises:
A compound obtained by reacting a polycarbonate polyol with a polyisocyanate. The polycarbonate polyol is obtained by condensation of a polyhydric alcohol with phosgene, chloroformate, dialkyl carbonate or diallyl carbonate. As the polyhydric alcohol, it is desirable to use 1,6-hexanediol, 1,4-butanediol, 1,3-butanediol, 1,5-pentanediol, or the like, and the number average molecular weight (Mn) of the polycarbonate polyol is preferably , About 300
It is desirably in the range of 15,000. The polycarbonate polyol is preferably used alone, but may be used in combination with a polyester polyol, a polyether polyol or a polyester-polyether polyol.

Examples of the polyisocyanate which reacts with the above-mentioned polycarbonate polyol include tolylene diisocyanate (TDI), 4,4'-diphenylmethane diisocyanate (MDI), xylene diisocyanate (XDI), and hexamethylene diisocyanate (HD).
I), hydrogenated MDI, hydrogenated TDI or isophorone diisocyanate (IPDI) is used. Among these, hydrogenated MDI is considered in consideration of the balance between availability, cost, and various characteristics required for the developing roller.
Alternatively, it is preferable to use IPDI.

On the other hand, as a main component of the surface layer, a resin composition containing an acrylic-vinyl carboxylate-based copolymer as a main component can be used from the viewpoint of reducing environmental fluctuation of roller resistance due to moisture absorption or the like. . In the acrylic-vinyl carboxylate copolymer, the total amount of the acrylate monomer component, the methacrylate monomer component and the vinyl carboxylate monomer component is 50% by weight or more, preferably 80% by weight or more in the resin component. Wherein the vinyl carboxylate monomer component is contained in the resin component in an amount of 3% by weight or more, preferably 5% by weight or more, more preferably 10% by weight or more.

Examples of the acrylate monomer component include methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, and the like, from the viewpoint that polymerization proceeds favorably.

The methacrylic acid ester monomer component may be selected from the viewpoint that polymerization proceeds favorably.
Examples thereof include methyl methacrylate, ethyl methacrylate, and butyl methacrylate. Among these, methyl methacrylate is preferred from the viewpoint of availability.

The vinyl carboxylate monomer component includes vinyl acetate, vinyl propionate, vinyl valerate, vinyl isovalerate, and the like from the viewpoint that polymerization proceeds favorably. Among these, it is preferable to use vinyl acetate from the viewpoint of availability and favorable negative charging of the toner.

The particles to be added are not particularly limited, but when used as a developing roller of an electrophotographic apparatus using a negatively charged toner, a polyurethane resin, a nylon resin, and an acrylic resin having a polarity opposite to that of the toner. Particles such as resin are preferred from the viewpoint of improving the chargeability of the toner. When used as a developing roller of an electrophotographic apparatus using a positively charged toner, particles of a fluororesin or a silicon resin are preferred.

As the material of the elastic layer, any material having surface tackiness may be used, and materials such as NBR, silicone, and urethane can be used. From the viewpoint of stably attaching particles to the surface of the elastic layer, JIS Z
Tilt ball tack test according to 0237 (tilt angle 30
(゜, 23 ° C.) 1 to 13, preferably 2 to 13.
From the viewpoint of exhibiting good adhesiveness, (A)
A polymer having at least one alkenyl group in the molecule and a repeating unit constituting the main chain being an oxyalkylene unit or a saturated hydrocarbon unit, and (B) having at least two hydrosilyl groups in the molecule A curing agent and (C)
A reaction product of a curable composition containing a hydrosilylation catalyst and (D) a conductivity-imparting agent as main components is particularly preferable.

The polymer of the component (A) in this 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) must be at least one in view of hydrosilylation reaction with the component (B), but from the viewpoint of obtaining sufficient rubber elasticity, the number of In the case of a molecule having two alkenyl groups at both ends of the molecule and having a branch,
It is desirable that two or more alkenyl groups be present at the molecular terminals. The main repeating unit constituting the main chain of the component (A) is an oxyalkylene unit or a saturated hydrocarbon unit.

First, the case where the main repeating unit constituting the main chain of the component (A) is a polymer comprising an oxyalkylene unit will be described. At this time, when a small amount of the conductivity-imparting agent as the component (D) is added to the cured product, the volume resistivity of the cured product becomes 10 ⁸ Ωcm to 10 ⁹ Ωcm, which is preferable when used as a developing roller. . From the viewpoint of lowering the hardness of the cured product, an oxyalkylene polymer in which the repeating unit is an oxyalkylene unit, and an oxypropylene polymer in which the repeating unit is an oxypropylene unit are preferable.

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. The unit contained other than the oxyalkylene unit contains 2 units of active hydrogen used as a starting material in the production of the polymer.
Compounds having at least one such as ethylene glycol,
Units composed of bisphenol compounds, glycerin, trimethylolpropane, pentaerythritol and the like. When the repeating unit is an oxypropylene-based unit, it may be a copolymer (including a graft copolymer) with a unit composed of ethylene oxide, butylene oxide, or the like.

The molecular weight of such an oxyalkylene polymer 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.
0, more preferably 1,000 to 40,000. In particular, those having a number average molecular weight of 5,000 or more,
Further, those having a molecular weight of 5,000 to 40,000 are preferable. 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, when the number average molecular weight is too large, the alkenyl group 1
Because the molecular weight per unit increases or the reactivity decreases due to steric hindrance, curing often becomes 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 an alkenyl group represented by the following general formula (1) is particularly preferred in that it has excellent curability.

H ₂ C ＝ C (R ¹ )-(1) (wherein R ¹ is a hydrogen atom or a methyl group) One of the features of this curable composition is that it is easy to set the hardness to be low. In order to exhibit this characteristic, the number of alkenyl groups is preferably two or more at the molecular terminals. However, if the number of alkenyl groups is too large as compared with the molecular weight of the component (A), the composition becomes rigid and it is difficult to obtain good rubber elasticity.

Next, the case where the component (A) is a polymer in which the main repeating units constituting the main chain are saturated hydrocarbon units will be described. This polymer is preferable in that it has a low water absorption and a cured product having a small environmental change in electric resistance is easily obtained. Further, similarly to the case of the oxyalkylene-based polymer, the component is a component which is cured by a hydrosilylation reaction with the component (B) and has at least one alkenyl group in the molecule. It becomes molecular and hardens. Further, (A)
The number of alkenyl groups contained in the component is required to be at least one from the viewpoint of hydrosilylation reaction with the component (B). However, from the viewpoint of obtaining good rubber elasticity, in the case of a linear molecule, It is preferable that two molecules are present at both ends. In the case of a molecule having a branch, it is preferable that two or more molecules exist at the molecular terminal.

Typical examples of the polymer in which the main repeating unit constituting the main chain is a saturated hydrocarbon-based unit 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% or more of a saturated hydrocarbon-based unit,
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 based on low water absorption.

The molecular weight of the polymer of component (A) in which the repeating unit constituting the main chain is a saturated hydrocarbon-based unit is about 500 to 50,000 in number average molecular weight (Mn), and more preferably 1,000. ~ 15,000
A liquid material having fluidity at room temperature is preferable in terms of ease of handling and workability.

The alkenyl group introduced into such a saturated hydrocarbon polymer is the same as in the case of the oxyalkylene polymer.

Therefore, preferred specific examples of the polymer as component (A), which contains at least one alkenyl group in the molecule and in which the main repeating unit constituting the main chain is a saturated hydrocarbon-based unit, include: Two alkenyl groups at both ends
And a linear number average molecular weight (Mn) of 2,000 to
Examples thereof include polyisobutylene-based, hydrogenated polybutadiene-based, and hydrogenated polyisoprene-based polymers having 15,000 and 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. Then, even 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, this number is from 2 to 30 in view of control of rubber elasticity of the cured product and storage stability.
, More preferably 2 to 20,
Furthermore, in terms of easily preventing foaming during curing, there are 20
The number is preferably 3 or more, and from the viewpoint that poor curing hardly occurs even when the hydrosilyl group is deactivated, the most preferable range is 3 to 20.

In the present invention, the above-mentioned hydrosilyl group is
To have one means to have one H bonded to Si. In the case of SiH ₂ , it means to have two hydrosilyl groups, but H bonded to Si is preferably bonded to different Si. It is preferable in terms of curability and rubber elasticity.

The molecular weight of the component (B) is 30,000 or less in terms of number average molecular weight (Mn) from the viewpoint of dispersibility and roller workability when the conductivity-imparting agent (D) is added. It is preferably 20,000 or less, more preferably 15,000 or less. In consideration of the reactivity and compatibility with the component (A), the number average molecular weight is 300 to 1
Preferably it is at 000.

With respect to 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 in terms of compatibility with the components and availability, and α-methylstyrene-modified products are preferred in terms of storage stability.

The hydrosilylation catalyst which is the component (C) is not particularly limited as long as it can be used as a hydrosilylation catalyst. Platinic acid (including complexes such as alcohols), various platinum complexes, 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 ratio of the component (B) to the component (A) in the curable composition as described above is such that the hydrosilyl group in the component (B) is 0.2 per mole of the alkenyl group in the component (A). When it is set so as to be present in an amount of from about 5.0 to about 5.0 moles, and more preferably from about 0.4 to about 2.5 moles, it is preferable to obtain good rubber elasticity.

The amount of component (C) used is as follows:
(A) 10 ^-1 to 1 mol of the alkenyl group in the component.
It is preferably used in the range of 10 ^-8 mol, particularly 10 ^-3 to 10 ^-6 mol. If the amount of the component (C) is less than 10 ^-8 mol, the reaction does not proceed. On the other hand, hydrosilylation catalysts
In general, it is expensive, corrosive, and has a property that a large amount of hydrogen gas is generated to cause foaming of the cured product. Therefore, it is preferable not to use more than 10 ^-1 mol.

Further, by adding a conductivity-imparting agent as the component (D) to the curable composition to form a conductive composition,
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 thereof include compounds capable of imparting conductivity. These conductivity imparting agents may be used alone or in combination of two or more.

The amount of the conductivity-imparting agent as the component (D) should be not more than 30% by weight based on the total amount of the components (A) to (C). preferable. On the other hand, in order to obtain a uniform volume resistivity, the addition amount is preferably 10% by weight or more, and the addition amount is determined so that the volume resistivity of the cured product is 10 ³ to 10 ¹⁰ Ωcm. Is preferred.

The curable composition includes the above (A) to
In addition to the component (D), a storage stability improver, for example, a compound having an aliphatic unsaturated bond, an organic phosphorus compound, an organic sulfur compound, a nitrogen-containing compound, a tin compound, or an organic peroxide may be added. good. Specific examples thereof include, but are not limited to, benzothiazole, thiazole, dimethylmalate, dimethylacetylenecarboxylate, 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.

Further, a filler, a storage stabilizer, a plasticizer, an ultraviolet absorber, a lubricant, a pigment, and the like may be added to the curable composition from the viewpoint of improving processability and cost.

The elastic layer is made of an elastic material such as the curable composition, urethane rubber, or silicone rubber.
Casting, injection molding, extrusion molding, etc. into a mold with a conductive core made of SUS or aluminum alloy at the center,
By heat-curing at an appropriate temperature and time, a conductive elastic layer is formed around the conductive core. In this case, post-curing may be performed after semi-curing.

In the developing roller according to the present invention, the particles are adhered to the periphery of the elastic layer, and the resin constituting the resin layer is applied to a predetermined thickness by dipping, spraying, brushing, or the like. It is obtained by drying at a temperature and curing.

In order to adhere particles to the surface of the elastic layer, electrostatic adhesion, a method of sprinkling particles while rotating a roller provided with an elastic layer, a method of rotating a roller on particles laid on a table, and the like can be used. After the particles are attached, it is also possible to remove extra particles by ironing jig, air spray or the like.

As a means for providing the resin after the particles are adhered to the elastic layer, of the above-mentioned methods, spraying is particularly preferable from the viewpoints of surface uniformity, prevention of contamination of the resin solution, and prevention of adhered particles from falling off.

[0053]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The constructions of the first to fourth embodiments according to the present invention will be described below in detail, and then these embodiments will be compared with comparative examples 1 and 2.

The developing rollers of these Examples and Comparative Examples are constituted by providing a 7.5 mm thick elastic layer concentrically around a SUS shaft having a diameter of 10 mm, and covering the elastic layer with a surface layer. Is done.

The above-mentioned elastic layer includes the following elastic layers 1-2.
Is used. (Elastic Layer 1) (A-1) 100 parts by weight of a terminal allylated polyoxypropylene polymer having a number average molecular weight (Mn) of 8,000 and a molecular weight distribution of 2.0, (B-1) polysiloxane System hardener (SiH value 0.36
(Mol / 100 g): 6.6 parts by weight, (C-1) 10% isopropyl alcohol solution of chloroplatinic acid: 0.06 parts by weight, (D-1) carbon black 3030B (manufactured by Mitsubishi Chemical Corporation): 8 parts by weight And a mixture obtained by defoaming under reduced pressure at a pressure of 10 mmHg or less for 120 minutes is coated on a shaft.
Let stand for 30 minutes in an environment of 0 ° C. and cure, thickness 7.5
The elastic layer 1 made of a rubber elastic body having a thickness of 1 mm was formed. (Elastic Layer 2) (A-2) Number average molecular weight (Mn): 10,000, 10 of polyisobutylene polymer having two vinyl groups at terminals
(B-2) polysiloxane-based curing agent (SiH value 0.97
(Mol / 100 g): 2.7 parts by weight, (C-2) 10% isopropyl alcohol solution of chloroplatinic acid: 0.06 parts by weight, (D-2) carbon black 3030B (manufactured by Mitsubishi Chemical Corporation): 10 parts by weight , (Others) Plasticizer PS-32 (manufactured by Idemitsu Kosan Co., Ltd.): 75 parts by weight, and a composition obtained by defoaming under reduced pressure at 10 mmHg or less for 120 minutes is coated on a shaft, and placed in a mold. 120
Let stand at 30 ° C for 30 minutes to cure, 7.5m thick
An elastic layer 2 made of a rubber elastic body was formed.

As the adhesion particles after the formation of the elastic layer, nylon particles (average particle diameter: 20 μm) and polyurethane particles (average particle diameter: 15 μm) are used, and a roller is rotated on these particles spread on a table to adhere the particles. Using.

As the surface layer of Examples 1 to 4, the following surface layer 1 was used by spray-coating the outer periphery of an elastic layer to which particles were attached. (Surface layer 1) Methoxymethylated nylon (EM-12
(0: manufactured by Lead City Co., Ltd.) was diluted with methanol to a solid content of 10% and dried in an oven at 80 ° C. for 1 hour to form a surface layer having a thickness of 15 μm.

In Comparative Examples 1 and 2, nylon particles or polyurethane particles were not adhered to the surface layer 1 before the elastic layer was formed.
Using a solution obtained by adding 30 parts by weight to 100 parts by weight of the solid content, a surface layer was prepared by spray coating.

Fifty developing rollers of Examples 1-4 and Comparative Examples 1 and 2 were produced.

Table 1 shows the structures of the developing rollers of Examples 1 to 4 and Comparative Examples 1 and 2. Table 1 shows the combination of the elastic layer, the particles, and the surface layer described above as the configuration of the developing roller.
The average value and the variation of the surface roughness Rz of the fifth and 50th rollers obtained in each example are shown. The variation here indicates the difference between the maximum value and the minimum value measured at 10 points in the roller.

Table 1 also shows the image evaluation results of the developing rollers of Examples 1 to 4 and Comparative Examples 1 and 2. Image evaluation was performed using Examples 5 to 6 obtained in Examples 1 to 4 and Comparative Examples 1 and 2.
The first and 50th developing rollers were assembled in a laser printer, and the uniformity of the solid black image was visually observed.
In the table, ◎ indicates an image having a sufficient density and uniformity, ○ indicates a sufficient density but a slightly non-uniform part is recognized, and Δ indicates a non-uniform density.

[0062]

[Table 1] From Table 1 above, it can be seen that the roller of this example has better surface roughness uniformity and better image evaluation than the comparative example.

Although the developing roller has been mainly described above, the present invention is not limited to this, and can be applied to a toner supply roller, a transfer roller, and the like.

[0064]

As described above, in the roller of the present invention, an elastic layer having surface adhesiveness is provided on the outer periphery of the conductive core, and particles are adhered to the outer periphery of the elastic layer by utilizing the adhesiveness. After that, by providing one or more resin layers, the surface roughness can be controlled uniformly and with good reproducibility,
A developing roller having excellent durability and image characteristics can be obtained.

Further, a toner supply roller excellent in toner supply property and a transfer roller excellent in toner release property can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a developing device and a photoconductor.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 developing device 2 photoreceptor 3 non-magnetic toner 4 toner container 5 regulating blade 6 developing roller 7 supply roller 8 conductive support 9 elastic layer 10 resin layer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H003 CC05 2H032 AA05 2H077 AC04 AD06 AD13 EA14 FA12 FA21 FA25 GA03 3J103 AA02 AA14 EA05 FA12 FA15 FA30 GA02 GA32 GA52 GA57 GA58 GA60 HA03 HA05 HA12 HA20 HA41 HA43 HA46 HA47 HA48

Claims (7)

[Claims] 1. An elastic layer having surface tackiness is provided on an outer periphery of a conductive core, and a single or plural resin layers are provided on the outer periphery of the elastic layer after particles are adhered. Roller to do. 2. The roller according to claim 1, wherein the adhered particles are selected from a polyurethane resin, a nylon resin, an acrylic resin, a fluorine resin, and a silicone resin. 3. A ten-point average surface roughness (Rz) of the roller.
Is in the range of 2 to 20 μm.
Or the roller according to 2. 4. The surface adhesion of the elastic layer is JIS Z
Tilt ball tack test according to 0237 (tilt angle 30
The roller according to any one of claims 1 to 3, wherein the temperature is in the range of 1 to 13 at (゜, 23 ° C). 5. The polymer according to claim 1, wherein the elastic layer comprises (A) a polymer having at least one alkenyl group in a molecule and a repeating unit constituting a main chain being an oxyalkylene unit or a saturated hydrocarbon unit. (B) a reaction product of a curing agent having at least two hydrosilyl groups in a molecule, (C) a hydrosilylation catalyst, and (D) a curable composition containing a conductivity-imparting agent as a main component. The roller according to any one of claims 1 to 4. 6. An elastic layer having surface tackiness is provided on the outer periphery of the conductive core, and a single or plural resin layers are provided on the outer periphery of the elastic layer after particles are attached. Roller manufacturing method. 7. The method for manufacturing a roller according to claim 6, wherein at least a resin layer of the one or more resin layers that is in contact with the elastic layer is provided by a spray method or a dipping method.