JP3248515B2 - Conductive roll - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive roll such as a developing roll, a charging roll and a transfer roll used in an electrophotographic apparatus such as a copying machine, a printer and a facsimile.

[0002]

2. Description of the Related Art Conventionally, a conductive roll has a structure in which a base rubber layer is formed on the outer peripheral surface of a shaft body, an intermediate layer is formed on the outer peripheral surface, and a surface layer is formed on the outer peripheral surface. Is used. As the base rubber layer of the conductive roll, for example, a composition obtained by blending a peroxide or a sulfur-based vulcanizing agent with a diene-based polymer is used.

[0003]

However, the above-mentioned conductive roll cannot obtain sufficient compression set characteristics, and has a drawback that an image after leaving the blade pressed 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 roll having excellent compression set characteristics and capable of obtaining an excellent image after leaving a blade pressed.

[0005]

Means for Solving the Problems To achieve the above object, a conductive roll according to the present invention is a conductive roll having a shaft and a base rubber layer formed on the outer peripheral surface of the shaft. The base rubber layer is formed using a diene polymer composition containing the following components (A) to (C). (A) Diene-based polymer. (B) A hydrosilyl curing agent represented by at least one general formula selected from the group consisting of the following general formulas (1) to (3).

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Embedded image (C) A compound represented by the following general formula (a). X-AX (a) [In the formula, A represents a divalent organic group. X represents an alkenyl group, which may be the same or different. ]

That is, the present inventors have conducted intensive studies mainly on the material for forming the base rubber layer in order to obtain a conductive roll having excellent compression set characteristics and capable of obtaining an excellent image after leaving the blade pressed. Was. As a result, the diene polymer (component A) and the specific hydrosilyl curing agent (B
When the compound (C) represented by the general formula (a) is used together with the component (A), the portion of A in the general formula (a) acts as a co-crosslinking point, and inhibits the crystallization of the component A. The present inventors have found that excellent flexibility and compression set characteristics can be obtained, and that an excellent image can be obtained after leaving the blade pressed.

When a specific compound is used as the compound (component (C)) represented by the general formula (a), more excellent compression set characteristics can be obtained, and the image after leaving the blade pressed is improved. I do.

[0008]

Next, an embodiment of the present invention will be described.

FIG. 1 shows an example of the conductive roll of the present invention. In this conductive roll, a base rubber layer 2 is formed along an outer peripheral surface of a shaft body 1, an intermediate layer 3 is formed on an outer peripheral surface of the base rubber layer 2, and a surface layer 4 is formed on an outer peripheral surface of the intermediate layer 3. Is formed. The most important feature of the conductive roll of the present invention is that the base rubber layer 2 is formed using a special diene-based polymer composition.

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

The base rubber layer 2 formed on the outer peripheral surface of the shaft 1 is formed by using a special diene polymer composition. And this diene-based polymer composition,
It can be obtained by using a diene polymer (component A), a specific hydrosilyl curing agent (component B), and a compound (component C) represented by the general formula (a).

The diene polymer (component (A)) is not particularly limited. For example, isoprene rubber, butadiene rubber, styrene-butadiene copolymer rubber (SB)
R), general-purpose rubbers such as ethylene-propylene copolymer rubber (EPDM), and liquid rubbers. These may be used alone or in combination of two or more. Among them, isoprene rubber and butadiene rubber are preferably used because they have excellent compatibility with the above-mentioned hydrosilyl curing agent (component B).

The rubber is not particularly limited, but a rubber derived from at least one of butadiene and isoprene and having a structural unit (α) having an alkenyl group in a side chain in a molecular chain is preferably used. The structural unit (α) is not particularly limited, and includes, for example, structural units represented by the following structural formulas (a) to (c). Then, the alkenyl group (vinyl group, isopropenyl group), which is a side chain in the structural unit, is subjected to a crosslinking reaction to form a three-dimensional network structure, and exhibits rubber-like elasticity.

[0014]

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Examples of the rubber having the above structural unit (α) in its molecular chain include butadiene rubber, isoprene rubber, butadiene-isoprene copolymer rubber, isoprene-
Styrene copolymer rubber and the like can be mentioned.

As the rubber, those having a structural unit derived from styrene together with the structural unit (α) are preferably used. The styrene may have a substituent, and the substituent is preferably an alkyl group, particularly preferably a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group,
1 to 1 carbon atoms such as sec-butyl group and tert-butyl group
5 alkyl groups. Examples of such rubber include butadiene-styrene copolymer rubber, isoprene-styrene copolymer rubber, butadiene-isoprene-styrene copolymer rubber, and the like.

Among the rubbers having a structural unit derived from styrene, an isoprene-styrene copolymer rubber having a repeating unit represented by the following general formula (d) is preferably used.

[0018]

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The content of the structural unit (α) in the rubber is preferably set in the range of 1 to 80% by weight of the whole rubber. That is, when the content ratio of the structural unit (α) is less than 1% by weight, the crosslinking reaction becomes insufficient, and the stability of the obtained molded crosslinked product may be deteriorated. If it exceeds, the network structure due to crosslinking becomes too dense, and the obtained molded crosslinked product may be hardened or brittle. Above all,
When the rubber does not have a structural unit derived from styrene, the content ratio of the structural unit (α) is particularly preferably set in the range of 2.5 to 70% by weight of the whole rubber. . When the rubber has a structural unit derived from styrene together with the structural unit (α), the content of the structural unit (α) is set in a range of 1.5 to 70% by weight of the whole rubber. It is particularly preferred that the

When the rubber has a structural unit derived from styrene together with the structural unit (α), the content of the structural unit derived from styrene is 5 to 20% by weight of the whole rubber. It is preferably set in the range, particularly preferably from 6 to 15% by weight. That is, if the content of the structural unit derived from styrene is less than 5% by weight, the effect of styrene may not be sufficiently obtained. Conversely, if the content exceeds 20% by weight, the viscosity of the rubber increases, This is because moldability may be deteriorated, or compression set characteristics may be deteriorated.

The number average molecular weight (Mn) of the rubber thus obtained is preferably set in the range of 700 to 200,000, particularly preferably 2,000 to 200.
100,000. Number average molecular weight (M
By setting n) within the above range, the handleability is excellent and the crosslinking reaction can be performed satisfactorily. Above all,
When the rubber does not have a structural unit derived from styrene, the number average molecular weight (Mn) is 70.
The range is preferably from 0 to 100,000, and particularly preferably from 2,000 to 50,000. Also, the rubber is
In the case of having a structural unit derived from styrene together with the structural unit (α), its number average molecular weight (Mn)
Is preferably in the range of 1,000 to 100,000, particularly preferably 10,000 to 80,000.

The specific hydrosilyl curing agent (component B) used together with the diene polymer (component A) is represented by at least one general formula selected from the group consisting of the following general formulas (1) to (3). Is what is done.

[0023]

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[0024]

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[0025]

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In the above general formulas (1) to (3), R ¹
The hydrocarbon group having 2 to 20 carbon atoms represented by is not particularly limited, and examples thereof include an alkyl group, a phenyl group, and an ether group (for example, an alkoxy group and an aryloxy group). Among them, a hydrocarbon group represented by the following general formula (4) is preferably used in view of compatibility with the diene polymer (component A).

[0027]

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Among the hydrocarbon groups represented by the general formula (4), a phenyl group, a phenylmethyl group, a phenylethyl group and a 2-phenylpropyl group are preferable, and a phenyl group and a 2-phenylpropyl group are particularly preferable. It is.

Among the hydrosilyl curing agents (component B) represented by the general formula (1), those represented by the following structural formulas (5) to (7) are preferably used.

[0030]

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[0031]

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[0032]

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Among the hydrosilyl curing agents (component B) represented by the general formula (2), those represented by the following structural formula (8) are preferably used.

[0034]

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Further, among the hydrosilyl curing agents (component B) represented by the general formula (3), those represented by the following structural formula (9) are preferably used.

[0036]

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The hydrosilyl curing agent (component B), for example, the hydrosilyl curing agent (component B) represented by the structural formula (5) can be produced by the following reaction.

[0038]

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The above reaction temperature is usually set in the range of 80 to 200 ° C., preferably 100 to 150 ° C.

Examples of the catalyst used in the above reaction include known hydrosilylation catalysts such as platinum, chloroplatinic acid, a platinum olefin complex, and a platinum vinylsiloxane complex. Of these, chloroplatinic acid is preferably used.

It should be noted that hydrosilyl curing agents (component B) other than those represented by the structural formula (5) can also be produced according to the above reaction.

The mixing ratio of the hydrosilyl curing agent (component B) may be set in the range of 1 to 15 parts with respect to 100 parts by weight (hereinafter abbreviated as "parts") of the diene polymer (component A). It is preferably, particularly preferably 2 to 8 parts. That is, if the amount is less than 1 part, the crosslinking is not sufficiently performed, so that the strength and the compression set deteriorate. On the other hand, if the amount exceeds 15 parts, the crosslinking is excessively advanced, and the material becomes hard and brittle, or the pot life is shortened. Because it becomes.

Used together with the above components A and B,
The specific compound (C component) is a compound represented by the following general formula (a). X-AX (a) [In the formula, A represents a divalent organic group. X represents an alkenyl group, which may be the same or different. ]

In the general formula (a), the divalent organic group represented by A is not particularly limited, but may be a divalent organic group derived from a saturated hydrocarbon or a divalent organic group derived from an alkylene oxide. At least one selected from the group consisting of a divalent organic group and a divalent organic group derived from an acrylic monomer is preferable.

In the general formula (a), the alkenyl group represented by X is not particularly limited, but includes a vinyl group (CH ₂ ＝ CH—) and an allyl group (CH ₂ ＣＨCHCH).
_2- ) and the like are preferable. The alkenyl groups at both terminals are
Although they may be the same or different, they are preferably the same.

Specific examples of the compound (component (C)) represented by the above general formula (a) include polyisobutylene having an allyl group at both ends (EPION60, manufactured by Kaneguchi Chemical Industry Co., Ltd.).
0A), polypropylene glycol (PPG) having allyl groups at both ends (manufactured by Kaneka Chemical Co., Ltd., Cyril ACX)
004A) and the like are preferably used.

The number average molecular weight (Mn) of the specific compound (component C) is preferably in the range of 500 to 80,000, particularly preferably 5,000 to 30,000.

The mixing ratio of the specific compound (component C) is preferably set in the range of 1 to 50 parts, more preferably 2 to 20 parts, per 100 parts of the diene polymer (component A). It is. That is, if it is less than 1 part, the effect of co-crosslinking decreases, and if it exceeds 50 parts,
This is because compatibility deteriorates and strength decreases.

The above diene polymer composition contains the above A
It is preferable to use a hydrosilylation catalyst together with the components C to C. The hydrosilylation catalyst is not particularly limited as long as it can exhibit a catalytic function for a crosslinking reaction, and examples thereof include chloroplatinic acid, complexes of chloroplatinic acid with alcohols, aldehydes, and ketones, and platinum / vinylsiloxane complexes. , A platinum / olefin complex, a platinum / phosphite complex, a carrier such as platinum, alumina, silica, carbon black, etc., on which solid platinum is supported. These may be used alone or in combination of two or more.

The diene polymer composition includes:
In addition to the above components, fillers such as silica, carbon black, and calcium carbonate, plasticizers, crosslinking accelerators, crosslinking retarders, antioxidants, coloring agents, and the like may be appropriately blended.

The diene polymer composition has the following composition:
For example, it can be prepared as follows. That is, first, a diene polymer (component A) and a specific compound (component C), preferably the above components A and C, and a hydrosilylation catalyst are blended at an appropriate ratio to prepare a rubber compound. When used, hydrosilyl curing agent (B
Component) to make a rubber compound. Further, it can be used as a liquid rubber corresponding to the polymer molecular weight.
In this case, a catalyst is used as a main component, and a hydrosilyl curing agent is used as a curing agent, and mixed by passing through a static mixer.
In use, it can be prepared by mixing a liquid base material and a liquid curing agent (crosslinking agent). Thus, the diene-based polymer composition is, from the viewpoint of storage stability,
It is preferable that the main agent and the curing agent are separately stored, and the compound is prepared by mixing the compound at the time of use.

The material for forming the intermediate layer 3 formed on the outer peripheral surface of the base rubber layer 2 is not particularly limited.
For example, acrylonitrile-butadiene rubber (nitrile rubber) (hereinafter abbreviated as “NBR”), polyurethane elastomer, chloroprene rubber (CR), natural rubber, butadiene rubber (BR), butyl rubber (IIR), hydrin rubber (ECO, CO), Nylon and the like. Above all, from the viewpoint of the adhesiveness and the stability of the coating solution,
NBR is preferably used.

The material for forming the intermediate layer 3 may include a conductive agent, a crosslinking agent, a crosslinking accelerator, stearic acid,
It is also possible to mix ZnO (zinc white), a softener and the like. Examples of the conductive agent include carbon black, graphite, potassium titanate, iron oxide, c-TiO ₂ , c-
ZnO, c-SnO ₂ , ionic conductive agents (quaternary ammonium salts, borates, surfactants, etc.) and the like. Note that the above “c−” means having conductivity.

The material for forming the surface layer 4 formed on the outer peripheral surface of the intermediate layer 3 is not particularly limited. For example, polyurethane elastomer, acrylic polymer,
Polyamide and the like can be mentioned. These can be used alone or 2
Used in combination of more than one species.

The material for forming the surface layer 4 may contain a conductive agent, a curing agent, and the like, if necessary.

The conductive roll of the present invention can be manufactured, for example, as follows. That is, first, each component for the base rubber layer 2 forming material is kneaded using a kneader such as a kneader to prepare a base rubber layer 2 forming material (diene-based polymer composition). Further, the respective components for the material for forming the intermediate layer 3 are kneaded using a kneader such as a roll, and the mixture is mixed with the organic solvent.
By stirring, a material (coating liquid) for forming the intermediate layer 3 is prepared. Further, a material (coating liquid) for forming the surface layer 4 is prepared according to the above method.

Next, the above-mentioned base rubber layer forming material (diene polymer composition) is filled into an injection molding die in which a core metal serving as a shaft is set, and heat crosslinking is performed under predetermined conditions. Thereafter, the mold is removed to produce a base roll having a base rubber layer formed along the outer peripheral surface of the shaft body. Next, the intermediate layer forming material (coating liquid) is applied to the outer peripheral surface of the base rubber layer to form an intermediate layer. Further, the surface layer forming material (coating liquid) is applied to the outer peripheral surface of the intermediate layer to form a surface layer. Thus, an intermediate layer is formed on the outer peripheral surface of the base rubber layer, an intermediate layer is formed on the outer peripheral surface, and a surface layer is formed on the outer peripheral surface of the conductive roll having a three-layer structure (see FIG. 1). Can be produced.

The method of forming the base rubber layer 2 is as follows.
The invention is not limited to the injection molding method, and may be produced by a casting method. The method for applying the coating liquid is not particularly limited, and examples thereof include a conventionally known dipping method, spray coating method, and roll coating method.

The conductive roll of the present invention is suitable for a developing roll, but is not necessarily limited to a developing roll, and can be applied to a transfer roll, a charging roll and the like. The conductive roll of the present invention is not limited to the three-layer structure, and an appropriate number of layers are formed. However, the base rubber layer must be formed of the special diene-based polymer composition.

In the conductive roll of the present invention, the thickness of each layer is appropriately determined according to the use of the conductive roll.
For example, when used as a developing roll, the thickness of the base rubber layer is preferably set in the range of 0.5 to 10 mm, particularly preferably 3 to 6 mm. The thickness of the intermediate layer is usually set in the range of 1 to 90 μm, preferably 3 to 30 μm, and the thickness of the surface layer is usually 3 to 1 μm.
It is set in the range of 00 μm, preferably 5 to 50 μm.

Next, examples will be described together with comparative examples.

[0062]

Example 1 [Preparation of Base Rubber Layer Forming Material] Isoprene rubber as component A (Kuraray IR-1 manufactured by Kuraray Co., Ltd.)
0) 100 parts and polyisobutylene having an allyl group at both terminals, which is a C component (EPION6, manufactured by Kaneguchi Chemical Industry Co., Ltd.)
00A) 15 parts and the following structural formula (10) which is a B component
And 5 parts of a hydrosilylation curing agent represented by the following formula: and a platinum carbonyl complex (Admax, S
IP 6829.0) 30 ppm, acetylene alcohol [3,5-dimethyl-1-hexyn-3-ol (DMHO)] 0.05 part, and acetylene black (Denka Black, manufactured by Denki Kagaku Kogyo Co., Ltd.) 15 parts. 20 parts of calcium carbonate (manufactured by Shiraishi Industry Co., Ltd., light coal silver W) and 5 parts of wet silica (manufactured by Nippon Silica Co., Nipsil VN3),
Using 3 parts of dicumyl peroxide (manufactured by NOF CORPORATION, PARK MILL D), a diene-based polymer composition was prepared according to the method described above.

[0063]

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[Preparation of Intermediate Layer Forming Material] 100 parts of NBR (Nipol DN401 manufactured by Zeon Corporation), 30 parts of a conductive agent (acetylene black), and 0.5 parts of stearic acid
, 5 parts of ZnO (zinc white), 1 part of a vulcanization accelerator BZ, 2 parts of a vulcanization accelerator CZ, and 3 parts of sulfur, are kneaded according to the above-described method, and then dispersed in an organic solvent to prepare A layer forming material (coating liquid) was prepared.

[Preparation of Surface Layer Forming Material] Polyurethane elastomer (Nipporan 2 manufactured by Nippon Polyurethane Industry Co., Ltd.)
304) 100 parts, carbon black 20 parts, and a curing agent (Dai Nippon Ink & Chemicals, Inc., Burnock D-75)
0) 25 parts were kneaded according to the method described above, and this was dispersed in an organic solvent to prepare a surface layer forming material (coating liquid).

[Preparation of Developing Roll] After filling the base rubber layer forming material (diene polymer composition) into an injection molding die in which a core metal (diameter: 10 mm, made of SUS304) serving as a shaft is set. Heat crosslinking was carried out at 160 ° C. for 7 minutes. Thereafter, the base roll was released and a base roll having a base rubber layer formed along the outer peripheral surface of the shaft body was manufactured.
Then, the intermediate layer forming material (coating liquid) was applied to the outer peripheral surface of the base rubber layer to form an intermediate layer.
Further, the surface layer forming material (coating liquid) was applied to the outer peripheral surface of the intermediate layer to form a surface layer. Thus, a developing roll having a three-layer structure in which the intermediate layer was formed on the outer peripheral surface of the base rubber layer, the intermediate layer was formed on the outer peripheral surface, and the surface layer was formed on the outer peripheral surface. The thickness of the base rubber layer was 5 mm, the thickness of the intermediate layer was 25 μm,
The thickness of the surface layer was 10 μm.

[0067]

Example 2 A diene polymer composition was prepared in the same manner as in Example 1 except that no peroxide was blended.
Then, using this diene-based polymer composition, a developing roll was prepared in the same manner as in Example 1 except that the heat crosslinking condition was 160 ° C. × 3 minutes.

[0068]

Example 3 A diene polymer composition was prepared in the same manner as in Example 1 except that a hydrosilyl curing agent represented by the following structural formula (11) was used instead of the above hydrosilyl curing agent. Then, using this diene-based polymer composition, a developing roll was prepared in the same manner as in Example 1, except that the heating and crosslinking conditions were set to 160 ° C. for 6 minutes.

[0069]

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[0070]

Example 4 Instead of using polyisobutylene having an allyl group at both ends (Kanebuchi Chemical Industry Co., Ltd., EPION600A), using PPG having allyl groups at both ends (Kanebuchi Chemical Industry Co., Ltd., Cyril ACX004A) In the same manner as in Example 1, a diene-based polymer composition was prepared. Then, using this diene-based polymer composition, a developing roll was prepared in the same manner as in Example 1, except that the heating and crosslinking conditions were set to 160 ° C. for 6 minutes.

[0071]

Example 5 A diene polymer composition was prepared in the same manner as in Example 1 except that butadiene rubber (Nipol BR1220NM, manufactured by Zeon Corporation) was used instead of isoprene rubber, and that no peroxide was blended. Then, using this diene-based polymer composition, a developing roll was prepared in the same manner as in Example 1 except that the heat crosslinking condition was 160 ° C. × 3 minutes.

[0072]

Example 6 Instead of isoprene rubber, liquid butadiene rubber (Kuraray Co., Ltd., Kuraprene LIR-300) [Mn:
40,000, the content ratio of the structural unit (α): 2.5% by weight], and no peroxide was used, to prepare a diene-based polymer composition in the same manner as in Example 1. And, using this diene polymer composition,
Example 1 except that the heat crosslinking condition was 160 ° C. × 3 minutes.
A developing roll was prepared in the same manner as described above.

[0073]

Example 7 Instead of isoprene rubber, isoprene: styrene = 90: 10 (weight ratio) isoprene-styrene copolymer rubber (Kuraray Co., Ltd., Kuraprene LIR-31)
0) A diene polymer composition was prepared in the same manner as in Example 1 except that [Mn: 30,000, the content ratio of the structural unit (α): 2.2% by weight] was used, and no peroxide was blended. Prepared. Then, using this diene-based polymer composition, a developing roll was prepared in the same manner as in Example 1 except that the heat crosslinking condition was 160 ° C. × 3 minutes.

[0074]

Example 8 Instead of isoprene rubber, butadiene-isoprene copolymer rubber having a butadiene: isoprene ratio of 90:10 (weight ratio) (Kuraray Co., Ltd., Kuraprene LIR-
390) A diene-based polymer composition was prepared in the same manner as in Example 1 except that [Mn: 34,000, the content ratio of the structural unit (α): 10% by weight] was used, and no peroxide was blended. . Then, using this diene-based polymer composition, a developing roll was prepared in the same manner as in Example 1 except that the heat crosslinking condition was 160 ° C. × 3 minutes.

[0075]

Comparative Example 1 Example 1 except that neither polyisobutylene having an allyl group at both ends (EPION600A, manufactured by Kaneka Chemical Co., Ltd.) nor a hydrosilyl curing agent was used.
A diene-based polymer composition was prepared in the same manner as described above. Then, using this diene-based polymer composition, a developing roll was prepared in the same manner as in Example 1, except that the heating and crosslinking conditions were set to 160 ° C. × 30 minutes.

Using the developing rolls thus obtained, each characteristic was evaluated according to the following criteria. The results are shown in Tables 1 and 2 below.

[Hardness] The hardness of the base rubber layer is determined according to JIS.
It measured according to K6301.

[Compression Set] The compression set of the base rubber layer was measured at 70 ° C. × 22 according to JIS K6301.
The measurement was performed under the conditions of time and a compression ratio of 25%.

[Electric Resistance] The electric resistance was measured by a metal roll method using an apparatus as shown in FIG. That is, the developing roll 22 was brought into contact with the metal roll 21 made of stainless steel, and both ends of the developing roll 22 were pressed with a load of 700 g. Then, a voltage of 100 V was applied to one end of the developing roll 22, and the electric resistance was measured.

[Image] The surface of the developing roll was pressed with a blade by 0.2 mm, and the image was evaluated after being left for 2 weeks. The evaluation results were displayed as follows. ：: There is no whitening on the solid black image at the third rotation of the developing roll. ×: Whitening is observed on the black solid image at the third rotation of the developing roll.

[0081]

[Table 1]

[0082]

[Table 2]

From the results shown in Tables 1 and 2, the developing rolls of the examples had better compression set characteristics and better images after standing for 2 weeks than the developing rolls of the comparative example. You can see that there is.

[0084]

As described above, in the conductive roll of the present invention, the base rubber layer formed on the outer peripheral surface of the shaft body is formed by the diene polymer (component A) and the specific hydrosilyl curing agent (component B). It is formed using a special diene-based polymer composition using the compound (component C) represented by the above general formula (a) in combination. Therefore, the above general formula (a)
The portion A in the film acts as a co-crosslinking point, can inhibit the crystallization of the component A, can provide excellent flexibility and compression set characteristics, and can provide an excellent image after the blade is left standing. .

When a specific compound is used as the compound (component C) represented by the general formula (a), more excellent compression set characteristics can be obtained, and the image after leaving the blade pressed is improved. I do.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram showing a method for measuring electric resistance.

[Explanation of symbols]

 1 Shaft 2 Base rubber layer 3 Intermediate layer 4 Surface layer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI G03G 15/02 101 G03G 15/02 101 15/08 501 15/08 501D 15/16 103 15/16 103 (72) Inventor Ikunuma Sumio 3600, Gezu, Kita-gai, Komaki-shi, Aichi Prefecture, Tokai Rubber Industries Co., Ltd. Kazuhiro Komaki City, Aichi Pref. 3600 Gezu, Kita-gaiyama Tokai Rubber Industry Co., Ltd. (56) References JP-A-11-84859 (JP, A) JP-A-11-1116739 (JP, A) 11-124473 (JP, A) JP-A-11-111064 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16C 13/00 C08L 9/00 C08L 71/00 C08L 83 / 05 G03G 15/02 101 G03G 15/08 501 G03G 15/16 103

Claims (2)

(57) [Claims] 1. A conductive roll comprising a shaft and a base rubber layer formed on the outer peripheral surface of the shaft, wherein the base rubber layer comprises the following components (A) to (C): A conductive roll formed using a diene-based polymer composition containing the conductive roll. (A) Diene-based polymer. (B) A hydrosilyl curing agent represented by at least one general formula selected from the group consisting of the following general formulas (1) to (3). Embedded image Embedded image Embedded image (C) A compound represented by the following general formula (a). X-AX (a) [In the formula, A represents a divalent organic group. X represents an alkenyl group, which may be the same or different. ] 2. The divalent organic group represented by A in the general formula (a) is a divalent organic group derived from a saturated hydrocarbon, a divalent organic group derived from an alkylene oxide, The conductive roll according to claim 1, wherein the conductive roll is at least one selected from the group consisting of a divalent organic group derived from an acrylic monomer.