JP2002298647A - Conductive composite and conductive member using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conductive composite that has excellent characteristics in both toner charging and toner separating. SOLUTION: This is a conductive composite that has the following as an essential content. (A) A copolymer made of the following, (a) fluoro-(meta) acrylate, (b) polysiloxane group contained (meta) acrylate, (c) (meta) acrylate other than (a) and (b). (B) fluoro-olefin system resin (C) (meta) acrylic system resin (D) amino resin (E) conductive agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a conductive composition and a conductive member using the same.

[0002]

2. Description of the Related Art As a conductive roll used in an electrophotographic apparatus such as a copying machine, a printer and a facsimile, a developing roll, a charging roll, a transfer roll and the like can be mentioned. An example of the conductive roll has a three-layer structure in which an innermost layer is formed on the outer peripheral surface of the shaft body, an intermediate layer is formed on the outer peripheral surface, and a surface layer is formed on the outer peripheral surface. Japanese Patent Application Laid-Open No. 7-54836 describes a method for obtaining stable toner chargeability over a long period of time and suppressing bleed and bloom of low molecular weight components to prevent contamination of the photosensitive drum.
Japanese Patent Laid-Open Publication No. HEI 9-214605 describes a conductive roll having a surface layer formed of a polyurethane-based thermoplastic elastomer (TPU) crosslinked with an amino resin.

[0003]

However, the above-mentioned conductive roll has a problem in that the toner chargeability of the surface layer is insufficient and the initial image quality is poor in recent remarkable improvement in image quality. Further, the conductive roll has a problem that the toner adhesion to the surface layer is poor, toner filming occurs, and the toner releasability is poor.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a conductive composition excellent in both characteristics of toner chargeability and toner releasability and a conductive member using the same. And

[0005]

Means for Solving the Problems In order to achieve the above object, the present invention provides, as a first gist, a conductive composition containing the following (A) to (E) as essential components. (A) A copolymer using the following (a) to (c). (A) fluorinated (meth) acrylate. (B) Polysiloxane group-containing (meth) acrylate. (C) (meth) acrylates other than (a) and (b). (B) fluorinated olefin resin. (C) (meth) acrylic resin. (D) amino resin. (E) a conductive agent.

[0006] A second aspect of the present invention is a conductive member using the above conductive composition.

That is, the inventors of the present invention focused on a conductive composition as a material for forming the conductive member, such as a conductive roll, in order to obtain a conductive member having excellent characteristics of both toner charging property and toner releasing property. We continued our research. As a result, when a specific copolymer (component (A)) having a polysiloxane group-containing (meth) acrylate (b) as a structural unit is used, the toner chargeability is improved by the siloxane component (b), When a specific copolymer (component A) having (meth) acrylate (a) as a structural unit and a fluorinated olefin-based resin (component B) are used in combination, it has been found that the fluorine component improves toner releasability. The present invention has been reached.

[0008]

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

The conductive composition of the present invention comprises a specific copolymer (component A) and a fluorinated olefin resin (component B).
And a (meth) acrylic resin (C component), an amino resin (D component), and a conductive agent (E component).

The above specific copolymer (component (A)) is a copolymer obtained by using the following (a) to (c). (A) fluorinated (meth) acrylate. (B) Polysiloxane group-containing (meth) acrylate. (C) (meth) acrylates other than (a) and (b).

The above fluorinated (meth) acrylate (a)
Is not particularly limited, and examples thereof include perfluoroalkyl esters of (meth) acrylic acid, partially fluorinated alkyl esters, and esters having a structure in which such fluorinated alkyl groups are linked via an organic linking group. can give. These may be used alone or in combination of two or more. Among these, a partially fluorinated alkyl ester of acrylic acid is preferably used.

The polysiloxane group-containing (meth) acrylate (b) is not particularly limited. For example, an acryloyl group or a methacryloyl group may be bonded to one or both ends of a polysiloxane chain via a divalent linking group. Esters having a structure in which any one of them is linked are exemplified. These may be used alone or in combination of two or more.

The (meth) acrylate (c) other than the above (a) and (b) is not particularly limited.
(Meth) acrylates that have not been modified by either fluorine modification or siloxane modification are exemplified. Specific examples include alkyl esters of (meth) acrylic acid such as methyl, ethyl, butyl, octyl, and dodecyl; hydroxyalkyl esters such as hydroxyethyl and hydroxybutyl; and glycidyl esters. These may be used alone or in combination of two or more. Of these, methyl methacrylate is preferably used.

The fluorinated (meth) acrylate (a), the polysiloxane group-containing (meth) acrylate (b) and the (meth) other than (a) and (b) in the above specific copolymer (component (A)) The weight mixing ratio of the acrylate (c) is usually (a + b) / c = 99/1 to 1/1000, and preferably (a + b) / c = 2/1 to 1/100.
And particularly preferably (a + b) / c = 49 / 51-
It is 1/100.

The average molecular weight (Mn) of the specific copolymer (A component) is preferably in the range of 2,000 to 1,000,000, particularly preferably 5,000 to 300,000.
It is.

The fluorinated olefin resin (component B) used together with the specific copolymer (component A) is not particularly limited, and examples thereof include vinylidene fluoride, tetrafluoroethylene, hexafluoropropylene, and vinyl ether fluoride. And those obtained by polymerizing or copolymerizing a fluorinated olefin monomer such as Specifically, polyvinylidene fluoride, vinylidene fluoride-tetrafluoroethylene copolymer, vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, fluoride And vinylidene-hexafluoropropylene copolymer. These may be used alone or in combination of two or more.

The above fluorinated olefin resin (component B)
Has an average molecular weight (Mn) of preferably 5,000 to 300,000, more preferably 30,000 to 15
000.

The (meth) acrylic resin (component (C)) used together with the specific copolymer (component (A)) and the fluorinated olefin resin (component (B)) is not particularly limited. It is a homo- or copolymer of an ordinary (meth) acrylate such as an alkyl ester of an acid such as methyl, ethyl, butyl, octyl or dodecyl; a hydroxyalkyl ester such as hydroxyethyl or hydroxybutyl; and a glycidyl ester. Among them, methyl methacrylate alone or a copolymer containing the same as a main component is preferably used.

The (meth) acrylic resin (component C) preferably has an average molecular weight (Mn) in the range of 2,000 to 200,000, particularly preferably 20,000 to 100,000.
000.

In the base polymer obtained by mixing the above specific copolymer (component A), fluorinated olefin resin (component B) and (meth) acrylic resin (component C), the blending of each component The proportion is preferably set in the range of 0.5 to 15% by weight for the component A, 15 to 85% by weight for the component B, and 10 to 75% by weight for the component C from the viewpoint of compatibility. However, the total of the components A, B and C is 100% by weight.

The amino resin (component D) used together with the above components A to C is obtained by subjecting a compound having an amino group (-NH ₂ ) such as urea, melamine, benzoguanamine or aniline to an addition condensation reaction of formaldehyde with a compound. It is a general term for curable resins, and specifically includes urea resin, melamine resin, methylolmelamine resin, benzoguanamine resin, aniline resin, acetoguanamine resin, formguanamine resin, methylolguanamine resin, and the like. These may be used alone or in combination of two or more. Among these, urea resins, melamine resins, and benzoguanamine resins are preferably used because of their excellent toner chargeability. In addition, the average molecular weight (M
n) is preferably in the range of 200 to 4,000, particularly preferably in the range of 300 to 2,500.

The mixing ratio of the amino resin (D component) is as follows:
The above base polymer (A component + B component + C component) 100
The range is preferably from 5 to 50 parts by weight, particularly preferably from 8 to 30 parts by weight (hereinafter abbreviated as "part"). That is, if the amount of the amino resin (D component) is less than 5 parts, the effect of lowering the friction tends to be inferior, and the effect of improving the chargeability of the toner is slightly reduced. This is because flexibility is lost, which may cause cracking or increase the roll rotation torque.

The conductive agent (component E) used together with the above components A to D is not particularly limited.
—TiO ₂ , c-ZnO, carbon black, c-Sn
Electronic conductive agents such as O ₂ , iron oxide, and graphite; and ionic conductive agents such as quaternary ammonium salts, borates, and lithium salts. These may be used alone or in combination of two or more. Note that the above “c−” means having conductivity.

The mixing ratio of the conductive agent (component E) is preferably in the range of 0.01 to 200 parts, more preferably 0.1 to 200 parts, per 100 parts of the base polymer (component (A + B + C)). 150 parts. That is, when the conductive agent (E component) is less than 0.01 part, the conductivity cannot be effectively exerted. On the other hand, when the conductive agent (E component) exceeds 200 parts, the coating film becomes brittle and hardened due to the conductive agent. This is because bloom bleed occurs.

The conductive composition of the present invention requires a charge control agent, a stabilizer, an ultraviolet absorber, an antistatic agent, a reinforcing agent, a lubricant, a release agent, a dye, a pigment, a flame retardant, an oil and the like. It is also possible to mix according to. Examples of the charge control agent include quaternary ammonium salts, borates, azine (nigrosine) compounds, azo compounds, metal complexes of oxynaphthoic acid, and surfactants (anionic, cationic, Nonionic) and the like.

In the conductive composition of the present invention, for example, an amino resin (D component) and a conductive agent (E component) are mixed with a base polymer (A component + B component + C component), and these are dispersed by a sand mill or the like. Can be obtained.

The conductive composition of the present invention can be used, for example, in a developing roll, a charging roll, a transfer roll, a paper feed roll in an electrophotographic apparatus such as a copying machine, a printer, and a facsimile.
In addition to a conductive roll such as a toner supply roll, it can be used for a conductive member such as a toner layer forming member, a cleaning blade, and a charging blade, and is optimally used as a surface layer material of the conductive roll.

Next, a conductive roll using the conductive composition of the present invention will be described. In this conductive roll, as shown in FIG. 1, an innermost layer 2 is formed along the outer peripheral surface of a shaft body 1, an intermediate layer 3 is formed on the outer peripheral surface, and the conductive layer of the present invention is further formed on the outer peripheral surface. It has a three-layer structure in which a surface layer 4 made of a composition is formed.

The shaft 1 is not particularly limited.
For example, a metal core made of a solid metal body, a metal cylindrical body hollowed out inside, or the like is used. Examples of the material include stainless steel, aluminum, and iron plated. Also, if necessary, the shaft 1
An adhesive, a primer and the like can be applied thereon. The adhesive, the primer and the like may be made conductive as needed.

The material for the innermost layer 2 is not particularly limited. For example, silicone rubber, ethylene-propylene-
Examples include diene rubber (EPDM), styrene-butadiene rubber (SBR), polyurethane-based elastomer, acrylonitrile-butadiene rubber (NBR), and the like. Among them, silicone rubber is particularly preferable because of its low hardness and little set. When silicone rubber is used as the material for the innermost layer 2, a step of activating the surface of the silicone rubber by corona discharge, plasma discharge, or the like, or a step of subsequently applying a primer may be performed.

A conductive agent may be appropriately added to the material for the innermost layer 2. Examples of the conductive agent include carbon black, graphite, potassium titanate, iron oxide, c-TiO ₂ , c-ZnO, and c-SnO which have been conventionally used.
₂ , ionic conductive agent (quaternary ammonium salt, borate,
Surfactants).

The material for the intermediate layer 3 is not particularly limited. For example, NBR, hydrogenated acrylonitrile-butadiene rubber (H-NBR), polyurethane elastomer, chloroprene rubber (CR), natural rubber, butadiene rubber (BR) And butyl rubber (IIR).
Among them, H-NBR is particularly preferred from the viewpoints of adhesiveness and stability of the coating solution.

The material for the intermediate layer 3 includes a conductive agent, a vulcanizing agent such as sulfur, a vulcanization accelerator such as guanidine, thiazole, sulfenamide, dithiocarbamate, and thiuram;
Stearic acid, zinc white (ZnO), a softener, and the like may be appropriately added. Note that, as the conductive agent, the same as described above is used.

The conductive roll shown in FIG. 1 can be manufactured, for example, as follows. That is, first, each component of the material for the innermost layer 2 is kneaded using a kneader such as a kneader to prepare a material for the innermost layer 2. Further, the respective components of the material for the intermediate layer 3 are kneaded using a kneader such as a roll, and the organic solvent is added to the mixture, followed by mixing and stirring to prepare a material for the intermediate layer 3 (coating liquid). I do. Further, the conductive composition as the material for the surface layer 4 is prepared according to the method described above.

Next, as shown in FIG. 2, the shaft 1 is prepared, an adhesive, a primer and the like are applied to the outer peripheral surface thereof as necessary, and then the shaft 1 is placed in a cylindrical mold 6 in which the lower lid 5 is fitted. Shaft 1
Is set. Next, after the material for the innermost layer 2 is cast or the like, the upper lid 7 is fitted over the cylindrical mold 6. Next, the whole of the roll mold is heated to vulcanize the material for the innermost layer 2 (150 to 220 ° C. × 30 minutes) to form the innermost layer 2.
Subsequently, the shaft 1 on which the innermost layer 2 is formed is released from the mold, and the reaction is completed as required (200 ° C. × 4 hours). Next, a corona discharge treatment is performed on the roll surface as needed. Further, a coupling agent is applied to the roll surface as needed. Then, a coating liquid serving as a material for the intermediate layer 3 is applied to the outer periphery of the innermost layer 2, or the roll on which the innermost layer 2 has been formed is immersed in the coating liquid and pulled up, followed by drying and heat treatment. Thereby, the intermediate layer 3 is formed on the outer periphery of the innermost layer 2. Further, the intermediate layer 3
A conductive composition (coating solution) to be a material for the surface layer 4 is applied to the outer periphery of the substrate, or the roll on which the intermediate layer 3 has been formed is dipped in the conductive composition (coating solution), pulled up, and then dried. And heat treatment,
The surface layer 4 is formed on the outer periphery of the intermediate layer 3. The method of applying the coating liquid is not particularly limited, and includes a conventionally known dipping method, spray coating method, roll coating method, and the like. In this way, it is possible to produce a conductive roll in which the innermost layer 2 is formed along the outer peripheral surface of the shaft body 1, the intermediate layer 3 is formed on the outer periphery, and the surface layer 4 is further formed on the outer periphery. .

The thickness of each layer in the conductive roll is as follows:
It is appropriately determined according to the use of the conductive roll. For example, when used as a developing roll, the thickness of the innermost layer is usually 0.5 to 10 mm, and the thickness of the intermediate layer is usually 1 to 10.
90 μm. And the thickness of the surface layer is 3 to 100 μm
Is preferably, and particularly preferably 5 to 50 μm.

The hardness of the conductive roll (JIS A)
Is preferably 70 Hs or less, particularly preferably 60 Hs.
It is as follows.

The above conductive roll is suitable for a developing roll, but is not necessarily limited to a developing roll.
The present invention can also be applied to a charging roll, a transfer roll, and the like.
The conductive roll using the conductive composition of the present invention is not limited to the three-layer structure as shown in FIG. 1, but has a single-layer structure, a two-layer structure, a four-layer structure or more. It does not matter. In this case, the conductive composition of the present invention is preferably used as a material for a surface layer of a conductive roll (when the conductive roll has a single-layer structure, its layer).

Next, examples will be described together with comparative examples.

First, prior to Examples and Comparative Examples, the following surface layer materials were prepared.

[Specific Copolymer (Component A)] A partially fluorinated alkyl ester of acrylic acid (a),
A / b / c = 10/1 with silicone alkyl ester of methacrylic acid (b) and methyl methacrylate (c)
A copolymer (Mn) copolymerized at a weight mixing ratio of 5/75
= 10,000)

[Fluorinated olefin resin (component B)] Vinylidene fluoride-tetrafluoroethylene copolymer (Mn =
100,000)

[(Meth) acrylic resin (component C)] Polymethyl methacrylate (OH value: 0.5 KOHmg)
/ Resin g)

[(Meth) acrylic resin (component C)] Polymethyl methacrylate (OH value: 1 KOHmg / resin g)

[Amino resin (D component)] n-butylated melamine resin (Super Beckamine J-820-60, manufactured by Dainippon Ink and Chemicals, Inc.)

[Amino resin (D component)] Isobutylated melamine resin (Super Beckamine L110-60 manufactured by Dainippon Ink and Chemicals, Inc.)

[Conductive agent (E component)] Carbon black (Denka Black HS-100 manufactured by Denki Kagaku Kogyo KK)

[Conductive agent (E component)] Quaternary ammonium salt (tetramethylammonium perchlorate: TMAC)

[0049]

Example 1 [Preparation of material for intermediate layer] H-NBR100
Part, stearic acid 0.5 part, zinc white (ZnO) 5 parts, carbon black (manufactured by Denki Kagaku Kogyo Co., Ltd., Denka Black HS-100) 40 parts, sulfur 1 part, and crosslinking accelerator BZ 1 part Part and 2 parts of the crosslinking accelerator CZ were kneaded according to the method described above, and then dispersed in an organic solvent to prepare an intermediate layer material (coating liquid).

[Preparation of Surface Layer Material] 10 parts of the above specific copolymer (component A), 40 parts of fluorinated olefin resin (component B), and 5 parts of (meth) acrylic resin (component C)
20 parts of an amino resin (D component) and 10 parts of a conductive agent (E component) are blended with 100 parts of a base polymer composed of 0 parts, and kneaded according to the above-mentioned method. A conductive composition (coating solution) as a surface layer material was prepared.

[Production of Developing Roll] In a mold in which a core metal (diameter: 10 mm, made of SUS304) serving as a shaft is set,
Conductive silicone rubber (X34-2) which is a material for the innermost layer
64 A / B, manufactured by Shin-Etsu Chemical Co., Ltd.), and then heat-crosslinked under predetermined conditions. Thereafter, the base roll was released and a base roll having the innermost layer formed along the outer peripheral surface of the shaft body was produced. Then, the intermediate layer material (coating liquid) is applied to the outer peripheral surface of the innermost layer to form an intermediate layer, and then the conductive composition (coating liquid) is further applied along the outer peripheral surface of the intermediate layer. Then, it was heated and cross-linked at 150 ° C. for 60 minutes to form a surface layer. Thus, a conductive roll having a three-layer structure in which the intermediate layer (thickness: 20 μm) was formed on the outer peripheral surface of the innermost layer (thickness: 5 mm) and the surface layer (thickness: 20 μm) was further formed on the outer peripheral surface. . The electric resistance of the innermost layer is 8 × 10 ⁴ Ω, hardness (Hs: JIS
A) is 35, the electric resistance of the intermediate layer is 8 × 10 ⁴ Ω,
Hardness (Hs: JIS A) was 73. The electric resistance of each layer was measured according to SRIS2304.

[0052]

Examples 2 to 5 Conductive compositions were prepared in the same manner as in Example 1 except that the components shown in Table 1 below were used in the proportions shown in the same table. Then, a developing roll was prepared in the same manner as in Example 1 except that a surface layer was formed using this conductive composition.

[0053]

[Table 1]

[0054]

Comparative Example 1 An ester thermoplastic urethane elastomer was used in place of the base polymer (component A + component B + component C). That is, the above-mentioned ester-based thermoplastic urethane elastomer (TAKETEC T-104 manufactured by Takeda Pharmaceutical Co., Ltd.)
0) 40 parts of carbon black (Denka Black HS-100, manufactured by Denki Kagaku Kogyo Co., Ltd.) and silica (Nippon Silica Co., Nip Seal E-150) were added to 100 parts
K) 20 parts and a butylated melamine resin which is an amino resin (manufactured by Dainippon Ink and Chemicals, Super Beckamine J-
820-60) to prepare a conductive composition. Then, a developing roll was prepared in the same manner as in Example 1 except that a surface layer was formed using this conductive composition.

[0055]

[Comparative Example 2] Silica (Nip Seal E manufactured by Nippon Silica Co., Ltd.)
A conductive composition was prepared in the same manner as in Comparative Example 1, except that -150K) was not blended. Then, a developing roll was prepared in the same manner as in Example 1 except that a surface layer was formed using this conductive composition.

[0056]

Comparative Example 3 Butylated melamine resin as an amino resin (manufactured by Dainippon Ink and Chemicals, Super Beckamine J-
820-60) A conductive composition was prepared in the same manner as in Comparative Example 1 except that 10 parts of a butylated benzoguanamine resin (manufactured by Dainippon Ink and Chemicals, Super Beckamine TD-126) was used instead of 10 parts. did. Then, a developing roll was prepared in the same manner as in Example 1 except that a surface layer was formed using this conductive composition.

[0057]

Comparative Example 4 Butylated melamine resin as an amino resin (manufactured by Dainippon Ink and Chemicals, Super Beckamine J-
820-60) A conductive composition was prepared in the same manner as in Comparative Example 1, except that 10 parts of an isocyanate-based curing agent (Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.) was used instead of 10 parts. Then, a developing roll was prepared in the same manner as in Example 1 except that a surface layer was formed using this conductive composition.

Using the developing rolls of the examples and comparative examples thus obtained, each characteristic was evaluated in accordance with the following criteria. The results are shown in Tables 2 and 3 below.

[Electric Resistance of Surface Layer] The electric resistance (volume resistivity) of the surface layer was measured according to SRIS2304 by applying 10 V using a silver paste electrode of 1 cm ² .

[Electric Resistance of Roll] The electric resistance of the roll was measured by a metal roll electrode method using an apparatus as shown in FIG. That is, the metal roll 1 made of stainless steel
The developing roll 12 was brought into contact with the developing roller 1 and both ends of the developing roll 12 were pressed with a load of 700 g. In this state, a voltage of 100 V was applied to one end of the developing roll 12, and the electrical resistance of the roll was measured.

[Coefficient of Static Friction] As shown in FIG. 4, a developing roller 21 was set on a fixed base 22, and a steel ball (diameter 3 mm) 23 with a load 26 of 100 g was moved at a moving speed of 0.3.
It was moved in the direction of the arrow at cm / sec. Then, the static friction coefficient was measured using a static friction coefficient meter (manufactured by Kyowa Interface Science Co., Ltd.). In the drawing, reference numeral 24 denotes a balance for zero adjustment, and reference numeral 25 denotes a load cell.

[Toner Charge Amount] Under an environment of 20 ° C. × 50% RH, the toner charge amount of the developing roll was 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, the developer 32 is sucked by the suction pump 33, and the toner charge amount is measured by the Faraday cage 34 (Faraday cage). Law). In the figure, 35 is a filter, 3
6 is an insulator pipe, 37 is an electrometer, and 38 and 39 are conductors separated from each other.

[Roll Rotation Torque] The developing roller was pressed against the fixed photoreceptor, the developing roller was rotated by a torque motor, and the current value at the start of the movement was measured. The pressure at which the developing roll was pressed against the photosensitive member was set to a pressure such that the contact portion of the developing roll was recessed by 0.3 mm in the radial direction. Then, the obtained measured value is converted into a torque, and when the calculated value always shows less than 0.3 N-m, it indicates ○, less than 0.3 N-m, but shows 0.3 N-m or more in the initial stage or the like. The case was evaluated as Δ, and the case where 0.3N-m or more was always shown was evaluated as x.

[Copy Image Quality] The above-mentioned developing roll was incorporated in an electrophotographic copying machine, and an image was formed in an environment of 20 ° C. × 50% RH. The evaluation of the copy image quality was as follows: a solid black image having a sufficient density (Macbeth density of 1.4 or more) and having no image unevenness or white spots was evaluated as ○; a solid black image having insufficient density (Macbeth density of less than 1.4); An image was evaluated as x when any one of image unevenness and white spots occurred.

[Durable Copy Image Quality] The above-mentioned developing roll was assembled in an electrophotographic copying machine, and an image was formed in an environment of 20 ° C. × 50% RH. Evaluation of endurance copy image quality is 500
After copying 0 sheets, a solid black image having a sufficient density (Macbeth density of 1.4 or more) and having no image unevenness or white spots was evaluated as ○, insufficient density (Macbeth density of less than 1.4), image unevenness, white spots Those that occurred in any one of the points were evaluated as x.

[Toner Filming Property] The above developing roll was incorporated in an electrophotographic copying machine, and an image was formed in an environment of 20 ° C. × 50% RH. Then, after 10,000 copies, toner filming in which a part of the developer adheres to the surface of the developing roll with a thickness of 1 μm or more is indicated by x,
A sample in which toner filming did not occur was evaluated as ○.

[0067]

[Table 2]

[0068]

[Table 3]

From the above results, the developing roll of the example product was
It can be seen that since the friction coefficient is small, the roll rotation torque is small, and the toner chargeability is excellent, so that the copy image quality and the durability copy image quality are good. Further, it can be seen that toner filming does not occur and the toner has excellent toner releasability.

On the other hand, the developing roll of the comparative example product
It can be seen that since the friction coefficient is large, the roll rotation torque is large, and the toner chargeability is poor, so that the copy image quality and the durability copy image quality are inferior. In addition, it can be seen that toner filming occurs, so that toner releasability is poor.

[0071]

As described above, a conductive member such as a conductive roll formed by using the conductive composition of the present invention has a specific composition containing a polysiloxane group-containing (meth) acrylate (b) as a constituent unit. Since the polymer (component A) is used, the chargeability of the toner is improved by the siloxane component (b), and the specific copolymer (component A) containing fluorinated (meth) acrylate (a) as a structural unit is used. ) And the fluorinated olefin-based resin (component (B)) are used in combination, so that the fluorine component improves toner release properties. In addition, since the amino resin (component D) is used as a curing agent, the surface hardness can be increased appropriately and the friction coefficient can be reduced, so that energy saving due to torque reduction and toner antistatic effect are excellent. Further, since an amino resin (component D) is used as a curing agent, the toner is more excellent in chargeability than when an isocyanate-based curing agent is used.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a conductive roll using the conductive composition of the present invention.

FIG. 2 is a cross-sectional view illustrating an example of a method for manufacturing the conductive roll.

FIG. 3 is an explanatory diagram showing a method for measuring the electric resistance of a roll.

FIG. 4 is an explanatory diagram showing a method for measuring a static friction coefficient by a static friction coefficient meter.

FIG. 5 is an explanatory diagram illustrating a method of measuring a toner charge amount.

[Explanation of symbols]

 1 shaft 2 innermost layer 3 middle layer 4 surface layer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 61/20 C08L 61/20 5G301 F16C 13/00 F16C 13/00 AE G03G 15/02 101 G03G 15 / 02 101 15/08 501 15/08 501D 15/16 103 15/16 103 (72) Inventor Kazuhiro Takeda 3-1-1, Higashi 3-chome, Komaki-shi, Aichi F-term (reference) 2H077 AD06 DB14 FA13 FA22 FA25 2H200 FA18 HA03 HA28 HB12 HB22 HB45 HB46 JA02 JA23 JA25 JA26 JB10 MA03 MA20 MB01 3J103 AA02 FA05 FA07 GA02 GA57 GA58 GA60 HA04 HA20 HA41 4J002 BD14W BD15W BD16W BE04W BG04X BG05X DG06B076 DG06B076 FD100 FD116 GM00 GQ02 4J027 AA08 AF01 AF05 AJ02 BA07 BA08 BA09 CD08 5G301 DA18 DA19 DA23 DA42 DA43 DD10

Claims (4)

[Claims] 1. A conductive composition comprising the following components (A) to (E) as essential components. (A) A copolymer using the following (a) to (c). (A) fluorinated (meth) acrylate. (B) Polysiloxane group-containing (meth) acrylate. (C) (meth) acrylates other than (a) and (b). (B) fluorinated olefin resin. (C) (meth) acrylic resin. (D) amino resin. (E) a conductive agent. 2. The conductive material according to claim 1, wherein the mixing ratio of (D) is set in the range of 5 to 50 parts by weight with respect to 100 parts by weight of the total of (A), (B) and (C). Composition. 3. The conductive composition according to claim 1, wherein (C) is crosslinked by (D). 4. A conductive member using the conductive composition according to claim 1.