JPH1149898A - Rubber composition, electroconductive belt and electroconductive roller using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber composition that has no anxiety of photoreceptor contamination and can give electroconductive belt and electroconductive roller excellent in its conductivity. SOLUTION: This rubber composition comprises a graft polymer prepared by grafting a plurality of side-chains bearing one or two or more alkylene oxide units to the main chains comprising polyolefin and at least one selected from alkali metal, alkaline earth metal and transition metal or their salts as an agent for imparting electroconductivity. The objective electroconductive belt and electroconductive rollers are formed by using the rubber composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive belt, a conductive roller, and a rubber composition used in an electrophotographic apparatus such as a copying machine, a laser printer, and a plain paper facsimile.

[0002]

2. Description of the Related Art In an electrophotographic apparatus such as a copying machine, a laser printer, and a plain paper facsimile machine, a printing paper is transported by electrostatic force, and the printing paper is conveyed on the surface of a photoconductor on which a toner image is formed during the transportation. There is known a transfer belt that transfers a toner image onto the surface of the printing paper by contacting the printing paper. By using this transfer belt, it is possible to transfer the toner image satisfactorily without being relatively affected by the type of printing paper and the transport speed, and to forcibly separate the printing paper after transfer from the photoconductor. Then, it can be held and transported.

In addition to the above-mentioned transfer belt, there is also known a transfer roller for bringing a printing paper into contact with the surface of a photoreceptor having a toner image formed thereon and transferring and contacting the toner image with the surface of the printing paper.

The above-mentioned transfer belt and transfer roller require conductivity having a volume resistivity of about 10 ⁶ to 10 ¹³ Ω · cm from the viewpoint of improving the transfer of the toner image. If the volume resistivity is lower than the above range, problems on the image such as a leak and a paper stain during transfer occur. vice versa,
If the volume resistivity exceeds the above range, the transfer efficiency becomes poor, and it becomes unsuitable for practical use.

Therefore, conventionally, carbon black, which is a conductive filler, is blended into a base rubber, and a conductive belt or a conductive roller is manufactured using the rubber composition thus obtained. Note that the carbon black is called an electron conductive filler because electrons flow when a voltage is applied and the carbon black exhibits conductivity.

However, when the rubber is made conductive only by electron conduction by an electron conductive type conductive filler such as carbon black, a slight change in the compounding amount of the conductive filler or dispersion inside the rubber is required. Depending on the state, there are problems such as a large variation in electric resistance and an unstable conductivity with time, and there is a problem that a stable image cannot be obtained.

Further, when a large amount of conductive filler is added to increase the conductivity of the rubber, the dependence of the electric resistance on the applied voltage increases, and a precise electric resistance is required to obtain a constant electric resistance. There are also problems such as the necessity of an applied voltage control device and the deterioration of the processability of the rubber composition.

Therefore, the present applicant has previously filed Japanese Patent Application No. 8-235.
No. 490 and Japanese Patent Application No. 9-203451, a so-called ion-conductive additive (for example, a plasticizer, a resin powder, etc.) showing conductivity by the action of ions is blended.
By using a base rubber that itself has ion conductivity because it contains metal ions derived from polymerization initiators and polymerization catalysts, it is possible to express conductivity by ion conduction alone, or to conduct ion conduction The present invention has proposed a conductive belt and a conductive roller that realize variation in electrical resistance and minimize change with time by exhibiting conductivity by using a combination of metal and electron conduction.

[0009]

However, in order to obtain a desired conductivity by ionic conduction, it is necessary to select and use a base rubber having a relatively high conductivity. In some cases, problems such as easy bleeding occur.

Also, alkali metals, alkaline earth metals, transition metals and their salts, or other common quaternary ammonium salts, which are usually used as an ion-conductivity-type conductivity imparting agent, are dispersed in rubber. Low affinity with plasticizers and surfactants that have the effect of enhancing the properties and stabilizing metal salts as metal ions. For this reason, the amount of the ion-conductivity-type conductivity-imparting agent that can be added to the rubber is at most 2-3 phr when a plasticizer is not used as a binder.
Usually, it is only 1 phr or less, and the effect of increasing the conductivity becomes insufficient. In order to increase the conductivity by increasing the amount of the conductivity-imparting agent, the amount of the plasticizer must be increased, and as a result, the plasticizer is bloomed or bleeds from the conductive belt or the conductive roller. There was a problem to do.

Accordingly, an object of the present invention is to use an ion-conductivity-type conductivity-imparting agent to suppress variations in electric resistance and changes over time, and to prevent the occurrence of plasticizer bloom or bleed and to provide an excellent conductivity. It is an object of the present invention to provide a rubber composition from which a conductive belt or a conductive roller having a property can be obtained, and a conductive belt and a conductive roller using the same.

[0012]

Means for Solving the Problems In order to solve the above problems, the inventors of the present invention have studied and found that a polyolefin main chain has a plurality of side chains having one or more alkylene oxide units. The grafted polymer (hereinafter referred to as “modified polyolefin”), an alkali metal,
At least one of the alkaline earth metals and the transition metals
The present inventors have found that the use of a metal or a salt thereof as a conductivity imparting agent is effective in solving the above-described problems and obtaining a conductive belt and a conductive roller having excellent conductivity. The invention has been completed.

That is, the rubber composition of the present invention is characterized by containing a modified polyolefin and at least one metal belonging to an alkali metal, an alkaline earth metal and a transition metal or a salt thereof as a conductivity-imparting agent. I do.

Further, the conductive belt and the conductive roller of the present invention are characterized by being formed using the rubber composition of the present invention.

The above modified polyolefin has a high affinity for alkali metals, alkaline earth metals, transition metals and salts thereof, and also has a high affinity for base rubbers usually used for conductive belts and conductive rollers. . Therefore, the modified polyolefin and the above-mentioned metal or a salt thereof can be sufficiently dispersed in the base rubber as a conductivity-imparting agent without adding a large amount of a plasticizer or a surfactant.

Further, since the above-mentioned conductivity-imparting agent has a high effect of imparting conductivity to rubber, when imparting desired conductivity to a belt or a roller, the amount of addition is smaller than that of a conventional conductive material. be able to.

Further, according to the present invention, the use of the above-described conductivity-imparting agent makes it difficult to impart sufficient conductivity with a conventional ion-conductivity-type conductivity-imparting agent. Can also be used as the base rubber.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION First, the rubber composition of the present invention will be described in detail.

The base rubber constituting the rubber composition of the present invention is not limited to this, but for example, natural rubber (N
R), acrylic rubber, isoprene rubber (IR), styrene-butadiene copolymer rubber (SBR), butadiene rubber (BR), acrylonitrile-butadiene copolymer rubber (NBR), hydrogenated nitrile rubber (HNBR), chloroprene rubber (CR) ), Ethylene-propylene-diene copolymer rubber (EPDM), butyl rubber (IIR), halogenated butyl rubber (X-IIR), epichlorohydrin rubber (hereinafter, epichlorohydrin homopolymer is CO, epichlorohydrin Of ethylene oxide with ethylene oxide
CO), urethane rubber (U), chlorinated polyethylene (CPE), chlorosulfonated polyethylene (CS)
M) and the like. These can be used alone or in combination of two or more. In the present invention, SBR, BR, IR, NR, EPDM, II
Rubber having a high volume resistivity such as R and X-IIR can also be used.

Among the above, particularly preferred base rubbers include, for example, CR, a mixture of CR and EPDM, NBR, N
A mixture of BR and EPDM, a mixture of NBR, CR and EPDM, HNBR, a mixture of HNBR and EPDM, HNB
A mixture of R and NBR, a mixture of HNBR and NBR and EPDM, a mixture of NBR and ECO, a mixture of CO, ECO, a mixture of CR and CO, a mixture of CR and ECO, an acrylic rubber,
CPE, a mixture of CPE and CO, a mixture of CPE and ECO, and the like.

The base rubber used in the present invention may contain, for example, a metal ion derived from a polymerization initiator or a polymerization catalyst, and may have ionic conductivity itself.

Among the base rubbers exemplified above, the NBR has an acrylonitrile content of 15 to 55%, preferably 25 to 55%.
~ 45% is preferably used.

Examples of the HNBR include Zetpol 1020, 2010, and 20 manufactured by Zeon Corporation.
20 and the like.

As the EPDM, those in which the diene component is ethylidene norbornene, 1,4-hexadiene, dicyclopentadiene or the like are preferably used.

In the combination system of CR and EPDM, the mixing ratio of both CR: EPDM is 99.9: 0.1 to 6
The ratio is preferably 0:40 (weight ratio).

In a combined system of NBR and EPDM,
NBR: EPDM is 99.9: 0.1-
The ratio is preferably 60:40 (weight ratio).

In the combined use system of HNBR and EPDM, the blending ratio of both HNBR: EPDM is 99.9:
It is preferably 0.1 to 50:50 (weight ratio).

In a combined system of HNBR and NBR,
HNBR: NBR is 99.9: 0.1-
The ratio is preferably 20:80 (weight ratio).

In the combined use system of NBR and ECO, the blending ratio NBR: ECO is 99.9: 0.1-0.
It is preferably 1: 99.9 (weight ratio).

In the combination system of NBR, CR and EPDM, the mixing ratio of NBR and CR is 9 for NBR: CR.
9.9: 0.1 to 10:70 (weight ratio), and E
It is preferable that the blending ratio of PDM is 0.1 to 20% by weight of the whole.

In the combination system of HNBR, NBR and EPDM, the mixing ratio of HNBR and NBR is HNBR: N
It is preferable that BR is 99.9: 0.1 to 10:70 (weight ratio) and the blending ratio of EPDM is 0.1 to 20% by weight of the whole.

The modified polyolefin in the present invention includes, for example, those whose main chain is made of polyethylene, polypropylene or the like.

The side chain in the modified polyolefin contains one or more alkylene oxide units such as ethylene oxide and propylene oxide, preferably 3 to 20, more preferably 6 to 12, and especially about 10 on average. To the main chain. The side chain may contain a structure other than the alkylene oxide, or may be further branched in some cases.

A plurality of the side chains are grafted in the main chain.
, Preferably 4 to 10, more preferably 7 to 9 grafts. Further, the number of side chains is 2 to 20, more preferably 3 to 12, per molecule of the modified polyolefin. In other words, a structure in which one main chain is suspended from the main chain monomer unit (repeating unit) is 2 to 20, preferably 3 to 12 times. As an example of such a modified polyolefin, for example, a trade name “Sumied 300” manufactured by Sumitomo Chemical Co., Ltd. and the like can be mentioned.

The modified polyolefin (for example, the above-mentioned “Smide 300”) contains an alkali metal, an alkaline earth metal and a salt thereof, and in some cases, a transition metal and a salt thereof, with a usual plasticizer, surfactant, oligomer or the like. And more can be added. As an example, the above-mentioned “Smide 300” may be added with lithium perchlorate in an amount of at least about 10% by weight of the whole.

When producing the rubber composition of the present invention and a conductive belt or a conductive roller using the same, “Smide 300” may be used in combination with an alkali metal, an alkaline earth metal,
Transition metals and their salts can be added simultaneously to the base rubber. Further, “Smide 300” in which the metal or salt is dispersed or dissolved in advance can be added to the base rubber.

The modified polyolefin can contain a large amount of alkali metals, alkaline earth metals, transition metals and salts thereof because the amount of alkylene oxide in the molecule is larger than that of other polyoxyalkylene compounds, Since the distance between the alkylene oxide chains is small, a large number of ions such as lithium ions can be included.
This is considered to be due to the fact that the degree of stabilization by the alkylene oxide chain increases.

In the present invention, examples of the alkali metal include lithium, sodium, potassium, rubidium and cesium; examples of the alkaline earth metal include magnesium, calcium, strontium and barium; and examples of the transition metal include titanium, chromium and iron , Cobalt, nickel, copper, zinc, yttrium, molybdenum, palladium, tungsten, osmium, silver and the like. Examples of these salts include perchlorate, thiocyanate, trifluorosulfonate, tetraphenylborate, chloride, bromide, iodide and the like.

In the present invention, among the alkali metals, alkaline earth metals, transition metals and salts thereof exemplified above, lithium or a salt thereof having a small atom size is preferable, and lithium perchlorate is most preferable. It is suitable.

In the rubber composition of the present invention, the added amount of the conductivity-imparting agent (the total amount of the modified polyolefin and at least one metal belonging to the alkali metals, alkaline earth metals and transition metals or a salt thereof) is a desired amount. Although it is not particularly limited because it differs depending on the degree of conductivity and the type of the base rubber, it is generally 0.2 to 15 parts by weight, preferably 2.5 to 15 parts by weight based on 100 parts by weight of the modified polyolefin and the base rubber. 7.5 parts by weight. If the amount of the conductive agent is less than the above range, sufficient conductivity may not be obtained. Conversely, if the addition amount exceeds the above range, the conductivity may become too large or the conductivity-imparting agent may bloom. Also, if the added amount of the conductivity-imparting agent is too large, regardless of the occurrence of bloom,
There is a possibility that the photoconductor contacting the inside of the copying machine may be contaminated, which may adversely affect printed matter.

In the present invention, a modified polyolefin, at least one metal belonging to an alkali metal, an alkaline earth metal and a transition metal or a salt thereof is used as a substance imparting ionic conductivity by being incorporated into a rubber composition. In addition, a metal salt doping plasticizer, lithium perchlorate, polyethylene oxide, a quaternary ammonium salt, and the like can be used in combination to such an extent that bloom does not occur.

The rubber composition of the present invention may contain a conductive filler and various known additives. Examples of the conductive filler include carbon black, graphite, etc., among which carbon black having a high conductivity-imparting effect, and medium-structure or low-structure carbon black whose conductivity gradually changes depending on the amount of addition. It is suitable.

Examples of the carbon black include channel black, furnace black, acetylene black, thermal black and the like, and other color blacks are also suitably used. Acetylene black;
Furnace black FEF, GPF, HAF, SRF;
Thermal black MT, FT and the like are preferred.

When carbon black is used as the conductive filler, the compounding amount is preferably 5 to 60 parts by weight based on 100 parts by weight of the base rubber.
More preferably, it is blended in a proportion of 50 parts by weight.

The rubber composition containing the base rubber and the conductive filler may further contain various conventionally known additives.

Examples of the known additives include a vulcanizing agent, a vulcanization accelerator, a vulcanization accelerator, an antioxidant, a softener, a plasticizer, a reinforcing agent, a filler, and a processing aid.

Among these, as the vulcanizing agent, for example, organic peroxides and the like can be used in addition to sulfur and organic sulfur-containing compounds. Examples of the organic sulfur-containing compound include tetramethylthiuram disulfide and N, N'-dithiobismorpholine. Examples of the organic peroxide include benzoyl peroxide and dicumyl peroxide. The amount of the vulcanizing agent is suitably from 0.3 to 4 parts by weight, preferably from 0.5 to 3 parts by weight, based on 100 parts by weight of the base rubber. Examples of the vulcanization accelerator include inorganic accelerators such as slaked lime, magnesia MgO and litharge PbO; thiurams such as tetramethylthiuram disulfide and tetraethylthiuram disulfide; dithiols such as zinc dibutyldithiocarbamate and zinc diethyldithiocarbamate. Carbamates; thiazoles such as 2-mercaptobenzothiazole and N-cyclohexyl-2-benzothiazolesulfenamide; trimethylthiourea;
Organic promoters such as thioureas such as N, N'-diethylthiourea are exemplified.

Examples of the vulcanization accelerator include metal oxides such as zinc white, fatty acids such as stearic acid, oleic acid and cottonseed fatty acids, and other conventionally known vulcanization accelerators.

Examples of the anti-aging agent include imidazoles such as 2-mercaptobenzimidazole; phenyl-
α-naphthylamine, N, N′-di-β-naphthyl-p
Amines such as phenylenediamine and N-phenyl-N'-isopropyl-p-phenylenediamine;
Examples include phenols such as rt-butyl-p-cresol and styrenated phenol.

Examples of the softener include fatty acids such as stearic acid and lauric acid, vegetable oils and mineral oils such as cottonseed oil, tall oil, asphalt substances, and paraffin wax.
And various synthetic softeners.

Examples of the plasticizer include dibutyl phthalate, dioctyl phthalate, tricresyl phosphate and the like, and those having conductivity can also be used.

As a reinforcing agent, carbon black is mentioned as a typical example as described above. Other reinforcing agents include, for example, silica-based or silicate-based white carbon, zinc white, surface-treated precipitated calcium carbonate, and carbonic acid. Inorganic reinforcing agents such as magnesium, talc and clay, and organic reinforcing agents such as coumarone indene resin, phenol resin and high styrene resin (styrene-butadiene copolymer having a high styrene content) can also be used.

As the filler, for example, calcium carbonate,
Clay, barium sulfate, diatomaceous earth and the like.

Examples of the processing aid include metal salts of fatty acids and esters of fatty acids.

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

The conductive belt of the present invention is manufactured as follows. First, a predetermined amount of each component constituting the rubber composition, which is a raw material of the conductive belt, is mixed and kneaded to produce a rubber composition, and then the rubber composition is extruded into a belt shape, preferably an endless belt shape. Alternatively, injection molding is performed, followed by vulcanization. Vulcanization is preferably can vulcanization, but other vulcanization methods may be used. The vulcanization conditions vary depending on the base rubber used and the amount of each component to be used.
It is preferable to carry out at a temperature of about 170 ° C. for about 0.2 to 6 hours. After vulcanization and cooling, the belt is polished to a predetermined rubber thickness. Further, if necessary, for example, when using a conductive belt as a transfer belt, to prevent contamination of the belt surface due to toner adhesion, to stabilize the surface resistivity,
A coating agent such as a urethane resin may be sprayed on the polished surface, or applied by a method such as dip, dried, solidified, and then heat-cured.

An example in which the conductive belt of the present invention is used as a transfer belt of an electrophotographic apparatus will be described with reference to FIG.

As shown in FIG. 1, in the electrophotographic apparatus, first, an electrostatic latent image is formed on the surface of the photosensitive member 5 whose surface has been charged in advance by the charging charger 4 by exposure in the exposure section A. Next, the electrostatic latent image is visualized into a toner image by the developing roller 6.

On the other hand, the printing paper 8 is conveyed from the paper feed roller 7 to the transfer section B by the transfer belt 3. Then, in the transfer section B, the toner image on the photoconductor 5 is transferred onto the printing paper 8 by the action of the transfer charger 9 on the back surface, and the printing paper 8 ′ after the transfer is continuously transferred to the fixing roller 10 by the transfer belt 3. The sheet is conveyed and fixed.

In FIG. 1, reference numeral 7 denotes a roller for supplying printing paper 8 to the transfer belt 3, reference numeral 11 denotes a cleaning blade for removing toner adhered on the transfer belt 3, and reference numeral 12 denotes a roller for driving the transfer belt 3. Are respectively shown.

In the above configuration, since the transfer belt 3 is charged by the action of the transfer charger 9, the printing paper 8 can be electrostatically attracted to the transfer belt 3. Separation and transport can be performed at the same time. That is, in the above configuration, the process of transfer and transport can be integrated, so that the size of the electrophotographic apparatus can be reduced.

Further, since the printing paper 8 is electrostatically attracted onto the transfer belt 3 and conveyed, there is little possibility that the position of the printing paper 8 is shifted, and the transfer belt 3 has the volume resistivity R as described above. And the use of the conductive belt of the present invention, which has a high transfer efficiency of 10 ⁶ to 10 ¹³ Ω · cm, enables good toner image transfer.

The conductive belt of the present invention can be used in addition to the above-described transfer belt, for example, an ordinary transport belt having no transfer function and having only a function of transporting printing paper.

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

The conductive roller 21 of the present invention is, for example, as shown in FIG.
As shown in FIG. 1, a conductive shaft 23 is inserted into a rubber tube 22 having conductivity.

The conductive roller 21 of the present invention is manufactured as follows. First, the rubber tube 22 of the conductive roller
After a predetermined amount of a core component constituting the rubber composition as a raw material of the above is mixed and kneaded to produce a rubber composition, the rubber composition is extruded or injection-molded into a tube shape, and then vulcanized. Vulcanization is preferably can vulcanization, but other vulcanization methods may be used. Vulcanization conditions vary depending on the base rubber used and the blending amount of each component.
It is preferable to carry out at a temperature of about 0.2 to 6 hours. After vulcanization and cooling, the rubber tube 22 is cut to a predetermined length,
The conductive shaft 3 is inserted and the rubber tube 22 is further inserted.
Is polished to a predetermined roller diameter.

As the conductive shaft and 23, any of those conventionally used can be used. Specifically, a metal shaft such as copper, aluminum, carbon steel, and stainless steel can be used.

The conductive roller of the present invention is used, for example, for charging or discharging the surface of a photoreceptor in an electrophotographic copying machine, and has a function of transferring a toner image on the surface of a photoreceptor as in the above-described transfer belt. It can also be used as a transfer roller that has been used or as a normal roller having only a function of transporting printing paper.

[0069]

The present invention will be described below with reference to examples and comparative examples.

The materials used in the respective examples and comparative examples are as follows.

For NBR, "Nippol 1032" manufactured by Zeon Corporation was used.

As the EPDM, "EPT4021" manufactured by Mitsui Petrochemical Industries, Ltd. was used.

The ECO includes “CG1” manufactured by Daiso Corporation.
04 "was used.

For the CR, "Neoprene WRT" manufactured by Showa Denko Dupont was used.

“RSS3” was used for NR.

The SBR includes “S” manufactured by Nippon Synthetic Rubber Co., Ltd.
BR1500 "was used.

Color black “# 25” manufactured by Mitsubishi Chemical Corporation was used as the conductive filler.

Examples of the conductivity-imparting agent include (1) the above-mentioned modified polyolefin [trade name “Sumied 30” manufactured by Sumitomo Chemical Co., Ltd.]
0)], (2) A product in which 10% by weight of lithium perchlorate (LiClO ₄ ) is contained in the “Smide 300” [hereinafter referred to as “Smide 300 + LiClO ₄ ”. And a conductive plasticizer manufactured by Sanken Kabushiki Kaisha (ester plasticizer containing lithium perchlorate, trade name “US70 (revised 2)”).

The vulcanization accelerator includes Ouchi Shinko Chemical Co., Ltd.
N-cyclohexyl-2-benzothiazolesulfenamide (trade name “Noxeller CZ”), N-cyclohexyl-2-benzothiazole sulfenamide
-Tert-butyl-2-benzothiazyl-sulfenamide (trade name “Noxerella NS”), tetramethylthiuram monosulfide (trade name “Noxeller T”)
S "), dibenzothiazyl disulfide (trade name" Noxeller DM "), di-ortho-tolylguanidine (trade name Noxeller" DT "), trade name" Noxeller EP-55 ", And diphenylguanidine (trade name “Noxeller D”) manufactured by the company.

As the zinc white, “# 1” manufactured by Toho Zinc Co., Ltd. was used.

As the stearic acid, “4931” manufactured by Unichema Australia was used.

As the silica, "Nip Seal ER-R" manufactured by Nippon Silica Co., Ltd. was used.

Processing aids include TECHNICAL P.S.
"TE-80" manufactured by KK was used.

As sulfur, powdered sulfur manufactured by Tsurumi Chemical Co., Ltd. was used.

(Production of Conductive Belt) Examples 1 to 10, Comparative Examples 1 to 11 A base rubber, a conductivity imparting agent and various additives were blended in the amounts shown in Tables 1 to 4, and a closed kneader was used. And kneaded. The rubber composition thus obtained was extruded into an endless belt using an extruder, and then placed in a vulcanizer and heated at 160 ° C. for 0.5 hour to perform vulcanization. Further, the surface was polished so that the rubber thickness of the belt was 0.50 ± 0.05 mm to obtain a belt. A urethane resin was applied to the polished surface to a thickness of about 10 μm to obtain a conductive belt.

(Method of Measuring Volume Specific Resistance logR) The volume specific resistance logR was measured for each of the obtained conductive belts. The measurement of the volume specific resistance R is performed under the above-described conditions using J
The measurement was performed in accordance with the method for measuring the resistivity described in IS K6911 “General Test Method for Thermosetting Plastics”, and the applied voltage was 100 V in all cases.

(Test Method for Presence or Absence of Photoconductor Contamination) A conductive belt was pressed against a photoconductor at a temperature of 40 ° C. under a condition of a relative humidity of 85% or less for one week, and then the conductive belt was removed from the photoconductor. Using the photoreceptor and the conductive belt, black solid printing was performed using a printer [Laser Shot A404 type, manufactured by Canon Inc.], and whether the printed matter was stained was examined according to the following criteria. A: No contamination was observed. ：: Slight contamination was observed, but it could be removed by imprinting within two sheets, and there was no practical problem. X: Severe contamination was observed (contamination that could not be removed even after printing three or more sheets).

The results of the above tests are shown in Tables 1 to 4 together with the mixing ratio of each component.

[0089]

[Table 1]

[0090]

[Table 2]

[0091]

[Table 3]

[0092]

[Table 4] As is clear from Tables 1 to 4, Examples in which a modified polyolefin containing 10% of lithium perchlorate, which is an alkali metal salt ("Smide 300"), was added as a conductivity-imparting agent, and an example in which the conductivity-imparting agent was added Lo and Comparative Example 1
Comparing the difference in gR (ΔlogR), “Smide 3
Example 1 in which 2.5 phr of “00 + LiClO ₄ ” was added
In Example 2, logR was reduced by 2.3 in Example 5, where 5 phr was added, and logR was reduced by 2.9 in Example 3 in which 10 phr was added, and logR was reduced by 3.6 in Example 4 in which 15 phr was added. As described above, in each of the examples, logR was significantly reduced (ΔlogR was large). Note that this tendency is observed in Examples 5 to 5 in which the base rubber is different.
10 was the same.

On the other hand, in the comparative example to which the conventional conductivity-imparting agent “US70 (revised 2)” was added, 5
In Comparative Example 4 in which phr was added, the logR was reduced by 1.2,
In Comparative Example 5 in which 0 phr was added, logR was only reduced by 2.5, and in Comparative Example 5, bleeding was remarkable. This tendency was observed in Comparative Examples 7 and 9 in which the base rubbers were different.
And 11 were similar.

In the case of using only “Smide 300” and containing no alkali metal, Comparative Example 3 in which 20 phr was added was used.
Also ΔlogR only showed 0.9.

[0095]

According to the rubber composition of the present invention and the conductive belt or the conductive roller using the same, high conductivity can be obtained without bleeding or blooming, and the photoreceptor is not contaminated.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of a conductive belt of the present invention.

FIG. 2 is an explanatory view showing an example of a conductive roller of the present invention.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F16G 1/06 F16G 1/06 G03G 15/16 G03G 15/16 103 103 103 H01B 1/22 H01B 1/22 Z

Claims (3)

[Claims] 1. A polymer in which a plurality of side chains having one or more alkylene oxide units are grafted on a main chain composed of polyolefin, and at least one metal belonging to an alkali metal, an alkaline earth metal and a transition metal. A rubber composition comprising a salt thereof and a conductivity-imparting agent. 2. A conductive belt formed using the rubber composition according to claim 1. 3. A conductive roller formed using the rubber composition according to claim 1.