JPH09254276A - Roll for electrophotographic machinery and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfy all of characteristics such as charge properties, toner releasability, abrasion resistance, strength or the like by coating the elastic layer on the outer periphery of a shaft body with a coating film forming soln. consisting of a thermoplastic polyurethane resin and a condensation reaction type silicone polymer. SOLUTION: As a roll for electrophotographic machinery, for example, there is a roll obtained by forming the innermost layer 11 on the outer peripheral surface of a shaft body 10 and forming an intermediate layer 12 on the outer peripheral surface thereof and further forming a coating film layer 2 on the outer peripheral surface thereof. The coating film layer 2 is formed on the outer peripheral surface of the intermediate layer 12 by using a resin compsn. containing a thermoplastic polyurethane resin and a condensation reaction type silicone polymer. As the thermoplastic polyurethane resin, one not having a crosslinked structure but having a straight chain structure and having OH groups at both terminals thereof is pref. The condensation reaction type silicone polymer is obtained, for example, by the condensation reaction of an SiOH group of the base polymer in the compsn. and the SiX group of a crosslin king agent therein.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing rolls used in electrophotographic equipment such as copiers, printers and facsimile machines, and a roll for electrophotographic equipment obtained by the method.

[0002]

2. Description of the Related Art As a roll used in a roll for electrophotographic equipment such as a copying machine, a printer and a facsimile machine, for example, the outermost layer surface of the roll described in JP-A-5-173409 is treated with siloxane isocyanate. Developed developing roll (roll) and JP-A-6-
A conductive roll (roll) in which silicone particles are contained in a silicone rubber described in Japanese Patent No. 221321 is favored.

[0003]

However, although the roll has excellent chargeability, since the silicone compound is unevenly distributed only on the surface portion of the outermost layer, when the silicone compound on the outermost layer surface is peeled off due to long-term use of the roll. However, there is a problem in that toner filming occurs and it becomes impossible to maintain initial characteristics such as chargeability and toner transportability.

On the other hand, the roll has excellent chargeability, and since silicone is present on the entire roll, the initial characteristics can be maintained even if the surface is worn, but since the wear is too much,
The roll itself becomes thin, the contact area (nip width) between the roll and the photoconductor changes, and the roll wears due to the toner clogged between the roll and the layer-forming blade, causing circumferential streaks in the image. Further, as a result of the linear pressure with the blade or the like being lowered, there arises a problem that the initial characteristics cannot be maintained.

The present invention has been made in view of the above circumstances, and a method for producing a roll for an electrophotographic apparatus, which satisfies all the characteristics such as chargeability, toner releasability, wearability (maintainability), and strength, and a method therefor. The purpose is to provide a roll for electrophotographic equipment obtained by the above.

[0006]

In order to achieve the above-mentioned object, the present invention provides a step of preparing a shaft body having an outer peripheral surface on which one or more elastic layers are formed and a solution for forming a coating film. And a step of applying the coating film forming solution on the outer peripheral elastic layer of the shaft, and drying the shaft coated with the coating film forming solution to form the coating film on the outer peripheral elastic layer. And a step of forming a coating film layer made of a solution, wherein the method for producing a roll for electrophotographic equipment, wherein the coating film forming solution contains the following components (A) and (B), A roll for an electrophotographic device, in which a single-layer or multi-layer elastic layer is formed on the outer peripheral surface of a shaft body, wherein the outermost layer of the elastic layer contains the following components (A) and (B): Second roll for electrophotographic equipment formed by
The summary of the (A) Thermoplastic polyurethane resin. (B) Condensation reaction type silicone polymer.

The "polymer" in the condensation reaction type silicone polymer which is the component (B) is generally in the intermediate region between the monomer and the polymer, and has a molecular weight of 1,000 to 1000.
It has a broad meaning including what is called an "oligomer" which is said to be 10,000. Therefore, in the present invention, without particularly distinguishing between an oligomer and a polymer,
Both are included and simply expressed as “polymer”.

The present inventors have conducted extensive studies to obtain a roll for electrophotographic equipment which satisfies all the characteristics of charging property, toner releasability, abrasion property (maintainability) and strength. as a result,
Thermoplastic polyurethane resin [component (A)] excellent in abrasion resistance (maintenance) and strength, and condensation reaction type silicone polymer [component (B)] excellent in toner releasability and chargeability
A coating film-forming solution containing and is applied to the elastic layer on the outer periphery of the shaft and then dried to form a coating film layer, which is called chargeability, toner releasability, abrasion resistance, and strength. They have found that a roll satisfying all the properties can be produced, and have reached the present invention. This is presumed to be due to the following reasons. That is, since the above-mentioned [(B) component] silicone polymer is a condensation reaction type, a condensation reaction occurs between the silicone polymers, and as a result, the silicone particles having a crosslinked structure are swollen with the solvent in the coating film forming solution. Exists. Since the silicone particles have a low interfacial tension, more of the silicone particles tend to come into contact with the air side when the coating film is formed. Therefore, when the coating layer-forming solution is applied onto the elastic layer on the outer periphery of the shaft and then dried to form the coating layer, as shown in the schematic view of FIG. Has a surface contact X with air and is uniformly dispersed on the surface 2a of the coating layer 2, so that the toner has excellent toner releasability. Moreover, since the silicone particles 1b that did not move to the air side are uniformly dispersed in the inside 2b of the coating layer 2, the silicone particles 1a existing on the surface 2a of the coating layer 2 peel off due to long-term use of the roll. Even if the surface 2a of the coating layer 2 is scraped off, the silicone particles 1b uniformly dispersed in the inside 2b of the coating layer 2 are sequentially exposed on the surface 2a of the coating layer 2. As a result, it is possible to suppress the occurrence of toner filming for a long period of time and maintain the chargeability.

[0009]

Next, embodiments of the present invention will be described in detail.

As the roll for electrophotographic equipment of the present invention,
For example, as shown in FIG. 2, a structure in which an innermost layer 11 is formed along the outer peripheral surface of a shaft body 10, an intermediate layer 12 is formed on the outer peripheral surface thereof, and a coating layer 2 is further formed on the outer peripheral surface thereof. I can give you what I became.

As the shaft body 10, any conventionally known shaft body may be used. For example, a metal core made of a solid metal body, a metal cylindrical body having a hollow inside, or the like is used. Examples of the material include aluminum and stainless steel.

The material for forming the innermost layer 11 formed on the outer peripheral surface of the shaft body 10 and the intermediate layer 12 formed on the outer peripheral surface thereof is not particularly limited, and any conventionally known material may be used. May be. For example, examples of the material for forming the innermost layer 11 include ethylene-propylenediene rubber (EPDM), styrene-butadiene rubber (SBR), silicone rubber, polyurethane elastomer, and the like, which are mixed with carbon black. The material for forming the intermediate layer 12 is, for example, EPDM, SBR,
Examples thereof include nitrile rubber, hydrogenated nitrile rubber, polyurethane elastomer, polyester, N-methoxymethylated nylon and the like, which are mixed with a conductive agent such as carbon black, metal oxide, quaternary ammonium salt and borate. A conventionally known method is also applied to the method of preparing the materials for forming the innermost layer 11 and the intermediate layer 12. Taking this example, first, the forming material (compound form) of the innermost layer 11 can be prepared by kneading the above components with a kneader such as a kneader. The material (coating liquid) for forming the intermediate layer 12 can be prepared by kneading the above components with a ball mill, a roll, or the like, adding a solvent to the mixture, and stirring the mixture.

The coating layer 2 formed on the outer peripheral surface of the intermediate layer 12 is formed by using a resin composition containing a thermoplastic polyurethane resin (component A) and a condensation reaction type silicone polymer (component B). Has been done.

The above thermoplastic polyurethane resin (component A)
Has a molecular weight of 500 represented by the following general formula (1):
There are 0 or more.

[0015]

Embedded image [In Formula (1), X is a hard segment part and Y is a soft segment part. ]

In the above formula (1), the hard segment portion represented by X includes diphenylmethane diisocyanate (MDI) and toluene diisocyanate (TD).
I), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), and other isocyanate-based substances, and examples of the soft segment portion represented by Y include ethylene adipate (EA), butylene adipate (BA), and polyene. Caprolactam (PC
L), hexamethylene adipate (HA), hexamethylene carbonate polyester (PCP) and other polyester polyols, or polypropylene glycol (PPG) and polytetramethylene glycol (PTM)
G) and other polyether polyols (molecular weight: 500 to
10,000). These are -OH at the end
Group, which may have a -NCO group, -NH ₂ group.

Such a thermoplastic polyurethane resin (A
The component) can be prepared, for example, by mixing an isocyanate and a polyol in a predetermined ratio, reacting in the presence of a catalyst, and taking out at a place where the viscosity is stable. In the reaction, a chain extender such as ethylene glycol, propylene glycol, 3,3′-dichloro-4,4′-diaminodiphenylmethane (MOCA), trimethylolpropane (TMP), hydroquinone diethylol ether (BHEB), A curing agent can also be added.

The above thermoplastic polyurethane resin (component A)
As the above, a linear structure (linear structure) is preferable instead of a crosslinked structure. This is because if the thermoplastic polyurethane resin (component A) has a crosslinked structure, the silicone particles produced by the condensation reaction of the silicone polymers will not easily pass through between the crosslinked structures of the thermoplastic polyurethane resin (component A), and the interfacial tension will increase. This makes it difficult for the silicone particles to move to the air side, so that the silicone particles are not uniformly dispersed on the surface of the coating layer.

Further, this thermoplastic polyurethane resin (A
The component) preferably has a —OH group at both ends.
This is because if -NCO groups or -NH ₂ groups remain at both ends, moisture in the air or bonding between molecules occurs, so that the surface state changes or tack occurs.

It is essential that the silicone polymer as the above-mentioned (B component) is a condensation reaction type. Here, the “condensation reaction type” means that, as represented by the following reaction formula (2),
It refers to the one in which the SiOH group as the base polymer in the composition and the SiX group as the cross-linking agent are subjected to a condensation reaction.

[0021]

Embedded image —SiOH + SiX − → —SiOSi − + HX (2) [In the formula (2), X is a hydrolyzable organic group such as a methoxy group, a ketoxime group, an acetoxy group or —H. ]

As described above, when the silicone polymer is a condensation reaction type, the heat required for curing inhibition and peroxide crosslinking in the addition reaction type silicone is not required, and the condensation reaction easily occurs between the silicone polymers. Silicone particles having a crosslinked structure are formed in the coating film forming solution, and unreacted silicone is less likely to remain in the coating film. Therefore, since the silicone particles are uniformly present in the coating layer (surface and inside), the occurrence of toner filming can be suppressed for a long period of time.

The molecular weight of the condensation reaction type silicone polymer (component B) is preferably in the range of 500 to 100,000, particularly preferably 1,000 to 10,000.
Range. That is, when the molecular weight of the condensation reaction type silicone polymer (component B) is less than 500, unreacted silicone remains in the formed coating film.
This is because if it exceeds 0,000, the condensation reaction type silicone polymer (component B) becomes difficult to dissolve in the solvent. In addition, as described above, the silicone polymer in the present invention generally includes a low molecular weight polymer called a silicone oligomer.

Examples of the condensation reaction type silicone polymer (component B) include those represented by the following general formula (3).

[0025]

Embedded image [In the formula (3), R is a methyl group, a phenyl group or the like, and X ₁ is a hydroxyl group, an acetoxy group, a ketoxime group, an alkoxyl group or the like. ]

Such a condensation reaction type silicone polymer (component B) is, for example, as described above, the SiOH group as the base polymer in the composition and the S as the crosslinking agent.
It can be prepared by a condensation reaction with an iX group.

The compounding amount of the condensation reaction type silicone polymer (component B) is the thermoplastic polyurethane resin (component A).
25-2 with respect to 100 parts by weight (hereinafter abbreviated as "part")
The range of 50 parts is preferable, and particularly preferably 50 to 150.
Range of parts. That is, if the compounding amount of the condensation reaction type silicone polymer (component B) is less than 25 parts, the toner releasability and chargeability are deteriorated.
If it exceeds 0 parts, thermoplastic polyurethane resin (A component)
This is because it is difficult to obtain the original effect of, that is, good wearability (maintainability) and strength.

The resin composition of the present invention contains
In addition to the above-mentioned thermoplastic polyurethane resin (component A) and condensation reaction type silicone polymer (component B), depending on the use of the roll using the same, an appropriate volume electric resistance (10
A conductive agent can be added for the purpose of imparting ⁵ to 10 ¹¹ Ω · cm. The characteristic relating to the volume electric resistance is important as the characteristic of the outermost layer of the developing roll, for example.

As the above-mentioned conductive agent, c-TiO ₂ , c-
ZnO, carbon black, c-SnO _2, iron oxides, graphite, potassium titanate, quaternary ammonium salts,
Borates, lithium salts and the like can be mentioned. These may be used alone or in combination of two or more. Among them, c-Ti is suitable because it can obtain an appropriate volume electric resistance.
It is preferable to use O ₂ , c-ZnO, and a quaternary ammonium salt. The above "c-" means that it has conductivity.

The amount of the above-mentioned conductive agent is 0.5 to 250 with respect to 100 parts of the thermoplastic polyurethane resin (component A).
The range of parts is preferable, and the range of 2 to 170 parts is particularly preferable. That is, when the content of the conductive agent is less than 0.5 part, it becomes difficult to obtain an appropriate volume electric resistance. On the contrary, when it exceeds 250 parts, the original content of the thermoplastic polyurethane resin (component A) is not achieved. This is because it becomes difficult to obtain the effect, that is, good wearability (maintainability) and strength.

Further, the resin composition of the present invention comprises
In addition to the above-mentioned conductive agent, thermoplastic polyurethane resin such as isocyanate compound, amine compound, epoxy compound (A
What cross-links the component), a charge control agent, a filler and the like can be appropriately blended as necessary.

The above-mentioned thermoplastic polyurethane resin (component A)
Various isocyanates (MD
I, TDI, IPDI, etc.), amino resin, crosslinking agent (MO
CA, ethylene diol, butane diol, etc.). Further, as the charge control agent, a quaternary ammonium salt, borate, azine-based (nigrosine-based) azo compound, oxynaphthoic acid-based metal complex, salicylic acid-based metal complex, surfactant (anion, cation, nonionic) Etc. And, as the filler, silica,
Examples include inorganic substances such as calcium carbonate and mica.

Next, the resin composition of the present invention can be produced using the above-mentioned materials, for example, by the method shown below.

First, the thermoplastic polyurethane resin (A
The above conductive agent is dispersed in the solution of component). As the dispersion method, the above-mentioned thermoplastic polyurethane resin (component A) is prepared by using methyl ethyl ketone (MEK), toluene, tetrahydrofuran (THF), dimethylformamide (DMF), dimethyl sulfoxide (DMSO), methyl isobutyl ketone (MIBK), cyclohexanone, etc. Method of dispersing the conductive agent in the solution after dissolving in a solution of, or, the thermoplastic polyurethane resin (component A) and the conductive agent, kneading using a kneader such as a twin-screw extruder, There is a method of dissolving the obtained kneaded product in the same solution as above.

Next, in a solution in which the above conductive agent is dispersed,
The condensation reaction type silicone polymer (component B) dissolved in the same solution as MEK, THF, etc. as described above is added, and the silicone polymer is subjected to a condensation reaction while stirring to produce a desired resin composition. it can. Examples of the stirring method include a method of stirring the coating liquid at a speed capable of sufficiently rotating the entire coating liquid at a speed of 500 to 2000 rpm until the condensation reaction proceeds sufficiently (that is, until the viscosity becomes constant), etc. as the stirring method. .

In the roll of the present invention, for example, as shown in FIG. 2, the innermost layer 11 is formed on the outer peripheral surface of the shaft body 10, and the intermediate layer 12 is formed on the outer peripheral surface of the innermost layer 11. An example is a structure in which the coating layer 2 is formed on the outer peripheral surface of the intermediate layer 12.

Then, the roll as shown in FIG.
For example, it can be manufactured as follows.

First, using the materials for forming the innermost layer 11 and the intermediate layer 12 prepared as described above, the innermost layer 11 and the intermediate layer 12 are formed in this order on the outer circumferential surface of the shaft body 10 in this order. A roll base is prepared. For example, as shown in FIG. 3, a compound-like innermost layer forming material is cast into the lower lid 15 and the cylindrical mold 16 on which the shaft body 10 is set, and the upper lid 17 is externally fitted to the cylindrical mold 16. In this state,
The entire roll mold is heated (vulcanization treatment, conditions: 150 to 200)
C. × 20 to 40 minutes) to form the innermost layer 11. Next, the shaft body 10 on which the innermost layer 11 is formed is demolded, and the residue of the vulcanizing agent is removed by evaporation if necessary. Then, an intermediate layer forming material (coating liquid) is applied to the outer peripheral surface of the innermost layer 11, and drying and heat treatment (vulcanization treatment, condition: 120 to
200 degreeC x 10-30 minutes) is performed and the intermediate | middle layer 12 is formed. For the coating, a conventionally known coating method such as a dipping method, a spray method, and a roll coating method can be applied. In this way, a roll substrate having the innermost layer 11 and the intermediate layer 12 formed on the outer periphery of the shaft body 10 is manufactured.

Finally, the resin composition is applied to the outer peripheral surface of the intermediate layer 12 of the roll substrate. This coating method is not particularly limited, and a conventional method such as a dipping method, a spray method, and a roll coating method can be applied. Then, after coating, drying (conditions: 40 to 150 ° C. × 5 to 60)
), The solvent in the resin composition is removed by evaporation. In this way, a roll having a three-layer structure as shown in FIG. 2 can be manufactured. In the above roll,
The thickness of each layer is appropriately determined. For example, in the developing roll, the thickness of the innermost layer is preferably set in the range of 2 to 10 mm, particularly preferably 3 to 6 mm. Also,
The thickness of the intermediate layer is preferably set in the range of 1 to 90 μm, particularly preferably 5 to 15 μm. And
The thickness of the coating layer is preferably set in the range of 10 to 100 μm, particularly preferably 20 to 50 μm.

The coating layer 2, which is the outermost layer of the roll, is formed of a thermoplastic polyurethane resin (component A) 3, silicone particles 1a and 1b, and a conductive agent 4, as shown in the schematic view of FIG. To be done. Then, the silicone particles 1a are brought into surface contact with air X and uniformly dispersed on the surface 2a of the coating layer 2, so that the toner releasability is excellent. Therefore, unlike the conventional case, the complicated work process of polishing the surface of the coating layer becomes unnecessary. Moreover, since the silicone particles 1b that did not move to the air side are uniformly dispersed in the inside 2b of the coating layer 2, the silicone particles 1a existing on the surface 2a of the coating layer 2 peel off due to long-term use of the roll. Even if the surface 2a of the coating layer 2 is scraped off, the silicone particles 1b evenly dispersed in the inside 2b of the coating layer 2 are sequentially coated.
Will be exposed on the surface 2a of the. As a result, the chargeability of the toner is stabilized for a long period of time, and the occurrence of toner filming can be suppressed.

In FIG. 4, the dimension Y (particle diameter in the thickness direction) of the silicone particles 1b is preferably in the range of 0.1 to 30 μm, particularly preferably in the range of 2 to 10 μm. That is, when the dimension Y of the silicone particles is less than 0.1 μm, the toner releasability deteriorates, and conversely, 30
This is because if the thickness exceeds μm, unevenness on the surface of the coating film becomes large, resulting in unevenness in the image, or holes when the particles are peeled off, leading to leakage.

The manufacturing method of the present invention is suitable for a developing roll, but is not necessarily limited to the developing roll. That is, the roll obtained by the production method of the present invention,
Since the coating layer has excellent toner releasability for a long period of time, it can be applied to any type of roll as long as the roll surface (coating layer) directly contacts the toner. But it is effective. Examples of such a roll include a fixing roll, a transfer roll, a charging roll, and a paper feed roll, in addition to the developing roll. Further, as an example of the method for manufacturing the roll of the present invention, the one having a three-layer structure is shown in FIG. Accordingly, an appropriate number of layers are formed. However, the outermost layer (in the case of a single layer, the layer) must be formed of the above special resin composition.

Next, examples will be described together with comparative examples.

First, prior to Examples and Comparative Examples, the following thermoplastic polyurethane resins A1-2, condensation reaction type silicone polymer B, conductive agents C1-3 and charge control agent were prepared.

[Thermoplastic Polyurethane Resin (TPU) A
1] Ether-based TPU (Elastolan ET880, Takeda Birdish Urethane Industry Co., Ltd.)

[Thermoplastic Polyurethane Resin (TPU) A
2] Ester-based TPU (Nipporan 5137, manufactured by Nippon Polyurethane Industry Co., Ltd.)

[Condensation Reaction Type Silicone Polymer B] TSE392 (manufactured by Toshiba Silicone Co.).

[Conductive agent C1] c-TiO ₂ (Taipaque ET700W, manufactured by Ishihara Sangyo Co., Ltd.)

[Conductive agent C2] c-ZnO (conductive zinc white 23K, manufactured by Hakusui Chemical Co., Ltd.)

[Conductive Agent C3] Carbon Black (Denka Black, manufactured by Denki Kagaku)

[Charge Control Agent] Nigrosine type charge control agent (Bontron N07, manufactured by Orient Chemical Co., Ltd.)

Prior to Examples and Comparative Examples, a core metal (diameter 10 mm, made of SUS304) to be a shaft, a liquid silicone rubber to which carbon black was added as an innermost layer forming material, and an intermediate layer forming material A hydrogenated nitrile rubber to which carbon black was added was prepared. Then, an innermost layer and an intermediate layer were formed on the outer periphery of the shaft body according to the method described above, and a roll base was produced.

[0053]

Examples 1 to 6 The above-prepared thermoplastic polyurethane resin, condensation reaction type silicone polymer and conductive agent were blended in the proportions shown in Table 1 below to prepare resin compositions. Specifically, the thermoplastic polyurethane resin is THF, MEK,
After dissolving in a solution such as toluene, a conductive agent is dispersed in this solution. Next, a solution prepared by dissolving the condensation reaction type silicone polymer in the above solution of THF, MEK, toluene, etc. is added to the solution in which the conductive agent is dispersed, and the silicone polymer is condensed while uniformly stirring the entire solution at high speed. The reaction was carried out to produce the desired resin composition.

The resin composition is applied to the outer peripheral surface of the roll substrate according to the above-mentioned method (coating method: roll coating method) and then dried to form a coating film layer. (See FIG. 2). The innermost layer of this roll has a thickness of 5 mm, and the intermediate layer has a thickness of 10 μm.
And the thickness of the coating layer was 50 μm.

[0055]

Comparative Examples 1 to 3 The above-prepared thermoplastic polyurethane resin, condensation reaction type silicone polymer, conductive agent and charge control agent were blended in the proportions shown in Table 2 below. A resin composition was produced in the same manner as in Example 1 except the above. Then, a roll was prepared in the same manner as in Example 1. The innermost layer of this roll has a thickness of 5 mm and the intermediate layer has a thickness of 1
It was 0 μm, and the thickness of the coating layer was 50 μm.

The electric resistance of the coating layer of each of the rolls of the above-mentioned examples and comparative examples was measured by the following method.
That is, a 10 mm square electrode (with a guard) was provided on the coating layer with silver paste, and the resistance between the electrode and the shaft was measured according to JIS K 6
It measured according to the method of 911. The results are shown in Table 1 below.
And also shown in Table 2.

[0057]

[Table 1]

[0058]

[Table 2]

With respect to the rolls of Examples 1 to 6 and Comparative Examples 1 to 3 thus obtained, the toner charge amount,
The toner filming and the amount of wear were measured. The results are shown in Tables 3 and 4 below. Then, based on these measurement results, comprehensive evaluation was performed as follows. That is, the toner charge amount is in the range of −8 to −15 μc / g, toner filming does not occur, and the abrasion amount is in the range of 0 to 20 mm ³ , which satisfies all the requirements. If even one was not satisfied, it was rated as × and a comprehensive evaluation was performed. The results are shown in Table 3 below.
And also shown in Table 4.

[Toner Charge Amount] The toner charge amount on the rolls of the example product and the comparative example product is 20 ° C. × 50% R
In H, it measured as follows. That is, as shown in FIG. 5, a developer (toner) 32 layer is formed on the surface of the developing roll 30, and the developer 32 is sucked by the suction pump 33.
Was sucked and measured by a Faraday cage 34 (Faraday cage method). In the figure, 35 is a filter, 36
Is an insulator pipe, 37 is an electrometer, and 38 and 39 are conductors, which are separated from each other.

[Toner Filming] In a portion where the toner thickly adheres to the surface of the developing roll, the charging property is deteriorated and a defective copy image occurs. Specifically, when a part of the toner component adheres to the surface of the developing roll with a thickness of 1 μm or more, the image is remarkably deteriorated. Therefore, when the toner adhesion is 1 μm or more, the toner filming is considered to have occurred.

[Abrasion Amount] In accordance with the Taber abrasion test described in JIS K 6264, the amount of abrasion was measured by separately preparing a surface layer sheet. In addition, the measurement was carried out using a wear wheel: CS1
0, rotation speed: 70 rpm x 1000 rotations, load: 500
It was performed under the condition of gf.

[0063]

[Table 3]

[0064]

[Table 4]

Next, the state of the silicone particles in the coating film layer of the roll of Example product 1 was examined with a scanning electron microscope (S-4).
100, manufactured by Horiba Ltd.). The results are shown in the photographs of FIGS. 6 and 7. 6 is a photograph showing the state of the coating layer surface of the roll of Example product 1 (magnification 1
000 times), and the white part in this photograph is the silicone particles. Further, FIG. 7 is a photograph (magnification: 1000 times) showing the state of the inside of the same coating layer (cross section in the axial direction).
In this photograph, the upper side of the drawing is the surface of the coating layer, the lower side of the drawing is the inside of the coating layer, the white portion is the silicone particles, and the black portion is the thermoplastic polyurethane resin.

From the photograph of FIG. 6, it can be seen that the silicone particles (white portion) are uniformly dispersed on the surface of the coating layer. Further, from the photograph of FIG. 7, it can be seen that the silicone particles (white portion) are uniformly dispersed in the thermoplastic polyurethane resin (black portion). Therefore, it is understood that the silicone particles are uniformly dispersed not only on the surface of the coating layer but also inside the coating layer.

[0067]

INDUSTRIAL APPLICABILITY As described above, the present invention provides a thermoplastic polyurethane resin (A) having excellent wear resistance (maintainability) and strength.
Component) and a condensation reaction type silicone polymer (component B) having excellent toner releasability and chargeability, a coating film-forming solution is applied onto the elastic layer on the outer periphery of the shaft body. After that, this is dried to form a coating layer. As described above, in the above resin composition, the thermoplastic polyurethane resin (component A) and the condensation reaction type silicone polymer (component B) do not react with each other, and the silicone polymer undergoes the condensation reaction. Has occurred. Therefore, since the silicone particles are in surface contact with air and are uniformly dispersed on the surface of the coating layer, the effect of excellent toner releasability is exhibited. Moreover, since the silicone particles that did not move to the air side are uniformly dispersed inside the coating layer, the silicone particles present on the surface of the coating layer peel off due to long-term use of the roll, and the surface of the coating layer Even if the shavings are scraped off, the silicone particles uniformly dispersed inside the coating film layer are successively exposed on the surface of the coating film layer. As a result, good chargeability can be maintained for a long time, and
It is possible to suppress the occurrence of toner filming. In addition, it has an excellent effect of improving wearability (maintainability).

Further, when a resin composition containing a conductive agent in addition to the thermoplastic polyurethane resin (component A) and the condensation reaction type silicone polymer (component B) is used, an appropriate volume electric resistance is imparted. You can also do it.
When a crosslinking agent is added, the friction coefficient can be lowered, the hardness can be increased, and the solvent resistance can be improved.

[Brief description of drawings]

FIG. 1 is a schematic view showing a microscopic structure of a coating layer cross section of a roll according to an example of the present invention.

FIG. 2 is a sectional view showing a structure of a roll according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a method of manufacturing a roll according to an embodiment of the present invention.

FIG. 4 is a schematic view showing a microscopic structure of a coating layer cross section of a roll according to an example of the present invention.

FIG. 5 is an explanatory diagram illustrating a method for measuring a toner charge amount on rolls of an example product and a comparative example product.

FIG. 6 is an electron micrograph showing the structure of silicone particles on the surface of a coating layer of a roll according to an example of the present invention.

FIG. 7 is an electron micrograph showing a structure of silicone particles inside a coating layer of a roll according to an example of the present invention.

[Explanation of symbols]

 2 Coating layer 10 Shaft 11 Innermost layer 12 Intermediate layer

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 1, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 6

[Correction method] Change

[Correction contents]

FIG. 6

[Procedure amendment 2]

[Document name to be amended] Drawing

[Name of item to be corrected] Figure 7

[Correction method] Change

[Correction contents]

FIG. 7

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location B29K 83:00 (72) Inventor Akihiko Kaji 3600 Amami Tsutsui, Komaki-shi, Aichi Tokai Rubber Industry Co., Ltd.

Claims (4)

[Claims] 1. A step of preparing a shaft body having a single-layer or multi-layer elastic layer formed on an outer peripheral surface thereof, a step of preparing a coating film forming solution, and the step of forming the coating film on the elastic layer on the outer periphery of the shaft body. Coating solution, and a step of drying the shaft coated with the coating film forming solution to form a coating film layer made of the coating film forming solution on the elastic layer on the outer periphery. A method for producing a roll for electrophotographic equipment, wherein the film forming solution contains the following components (A) and (B). (A) Thermoplastic polyurethane resin. (B) Condensation reaction type silicone polymer. 2. The method for producing a roll for electrophotographic equipment according to claim 1, wherein the coating film forming solution further contains a conductive agent in addition to the components (A) and (B). 3. A roll for an electrophotographic apparatus, wherein one or more elastic layers are formed on the outer peripheral surface of a shaft body, wherein the outermost layer of the elastic layers comprises the following components (A) and (B). A roll for electrophotographic equipment, which is formed of a resin composition containing. (A) Thermoplastic polyurethane resin. (B) Condensation reaction type silicone polymer. 4. The roll for electrophotographic equipment according to claim 3, wherein the resin composition further contains a conductive agent in addition to the components (A) and (B).