JP3391902B2 - Conductive roller - 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 roller which is used by being brought into contact with a photoconductor of an electronic copying machine or printer for copying or printing by utilizing electrostatic force.

[0002]

2. Description of the Related Art For example, in an electronic copying machine, toner is attracted and adsorbed by a photoconductor on which an electrostatic latent image corresponding to an original image is formed by electrostatic force, and the toner is transferred onto a fed sheet. Then, the original image is copied onto the paper by thermally melting the toner carried on the paper.

That is, in the electronic copying machine, charging,
It is configured to copy by going through the processes of exposure, development, transfer, fixing, cleaning and charge removal. In particular, the roller used in each process of charging, developing, transferring, and cleaning is used by being brought into contact with the photoconductor and being driven to rotate, so that the roller is required to have appropriate elasticity.

Therefore, conductive polyurethane foam, chloroprene rubber, EP rubber, and silicone resin are often used for manufacturing the roller.

However, when a roller made of the above-mentioned material is used for the above-mentioned application, the migratory substances such as unreacted monomers, oligomers, and other non-reactive additives contained in the roller are included in the photoreceptor. To become contaminated, resulting in blurred images.

In order to solve the above problems, the roller surface is used by coating it with a nylon-based, acrylic-based, or fluororesin-based material or by covering it with a heat-shrinkable tube.

Similarly, in order to control the specific resistance of the roller, the surface of the roller is coated with a semiconductive material and used.

[0008]

However, nylon-based, acrylic-based, and fluororesin-based materials are essentially rigid, and have sufficient elasticity of polyurethane foam, chloroprene rubber, EP rubber, and silicone resin, which are the main materials. Since it cannot be utilized, stable contact and driven rotation cannot be obtained,
As a result, there is a problem that a stable image cannot be obtained.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the problems in the prior art as described above, and in a conductive roller to be used in contact with a photoreceptor of an electrophotographic machine or printer, At least the surface layer is a curing agent having at least two hydrosilyl groups in the molecule (A), and a polyoxypropylene polymer having at least two alkenyl groups in the molecule (B) and having a number average molecular weight of 500 to 3,000. Certain compounds and (C)
A conductive roller (claim 1) comprising a cured product of a composition containing a hydrosilylation catalyst, and the composition according to claim 1 further comprising (D) a conductivity-imparting agent (B) component 100.
The present invention relates to a conductive roller (claim 2) comprising a cured product of a composition obtained by adding 0.1 to 50 parts to parts (parts by weight, the same applies hereinafter).

[0010]

At least the surface layer of the conductive roller of the present invention has (A) a curing agent having at least two hydrosilyl groups in the molecule, and (B) a polyoxypropylene-based polymer having at least two alkenyl groups in the molecule. Since it is formed from a cured product of a composition containing a compound having a number average molecular weight of 500 to 3000 and (C) a hydrosilylation catalyst as a united body, it is possible to use unreacted monomers, oligomers, etc. in addition to the surface layer of the conductive roller. Even if a transferable substance such as the non-reactive additive is contained, the transfer to the photoconductor is prevented and the surface of the conductive roller is not rigid.

[0011]

EXAMPLES At least the surface layer of the conductive roller of the present invention comprises (A) a curing agent having at least two hydrosilyl groups in the molecule and (B) a polyoxypropylene having at least two alkenyl groups in the molecule. It is produced from a composition containing a compound having a number average molecular weight of 500 to 3000 and a (C) hydrosilylation catalyst (hereinafter, also referred to as a specific composition).

As described above, at least the surface layer of the conductive roller of the present invention is formed of a specific composition.
Since the cured product of the specific composition is essentially flexible, it is possible to stabilize contact with the photoreceptor and driven rotation, and
By setting the number average molecular weight of the component (B) to 500 to 3,000, the tack of the cured product itself can be made almost zero, so that the residual toner on the photoconductor is less likely to adhere and the image defects due to it can be reduced. Because you can.

The fact that at least the surface layer of the conductive roller is manufactured from the composition comprising the components (A) to (C) means that a layer of a specific composition is formed on the surface of the elastic layer of the conductive roller. Or the elastic layer itself is formed from a specific composition and the surface is also formed from a specific composition. For example, a roller formed from urethane foam, chloroprene rubber, EP rubber, silicone resin, or the like. The surface is provided with a coating layer having a thickness of, for example, 1 to 500 μm, preferably 3 to 200 μm using the above-mentioned specific composition, or a tubular material having the above-mentioned thickness produced from the above-mentioned specific composition is coated on a roller. By doing so, a cured product layer from a specific composition may be formed on the surface of the roller, and the specific composition is used as a main material of the roller. When the elastic body layer is formed, it may be left as it is, and further, as described above, further coating layer may be provided on the elastic body layer from the specific composition,
It means that it may be covered with a tubular material.

When the surface layer is formed of a specific composition, the elastic layer may be, for example, a curing agent having at least two hydrosilyl groups in the molecule (a) and at least two alkenyl groups in the molecule (b). Group-containing polyoxypropylene polymer having a number average molecular weight of 300
It goes without saying that a composition comprising more than 0 and not more than 50,000 compounds and (c) a hydrosilylation catalyst may be used. In this case, when the elastic layer is formed of urethane foam or the like. The adhesive strength of the surface layer is improved. In addition, the number average molecular weight of the polyoxypropylene-based polymer, which is the main material forming the elastic layer, can be arbitrarily selected according to the required mechanical properties and processability.

The curing agent having at least two hydrosilyl groups in the molecule which is the component (A) used in the specific composition of the present invention has at least two alkenyl groups in the molecule which is the component (B). It is a component that acts as a curing agent for the compound having a number average molecular weight of 500 to 3000 in the polyoxypropylene polymer.

Since the component (A) has at least 2, preferably 2 to 15 and more preferably 3 to 12 hydrosilyl groups in the molecule, each hydrosilyl group is present in the molecule of the component (A). And reacts with the alkenyl group to cure. When the number of the hydrosilyl groups is less than 2, the curing rate when the composition of the present invention is cured by the hydrosilylation reaction becomes slow and the curing failure often occurs. Further, the number of the hydrosilyl group is 1
When it is more than 5, the stability of the curing agent as the component (A), and thus the stability of the specific composition, becomes poor, and moreover, a large amount of hydrosilyl groups remain in the cured product even after curing, resulting in voids and cracks. Cause.

Having one hydrosilyl group means Si
It means having one H, and in the case of SiH ₂ , it has two hydrosilyl groups, but H bound to Si has better curability when it is bound to different Si. It is also preferable in terms of elasticity.

The molecular weight of the component (A) is preferably 30,000 or less in terms of number average molecular weight from the viewpoints of dispersibility of the conductivity-imparting agent, which will be described later as the component (D), and roller processability. It is more preferably 2,000 to 20,000, further preferably 3,000 to 15,000.

The structure of the component (A) as described above is not particularly limited, but for example, the general formula (1): R ¹ X _a (1) (wherein, X is a group containing at least one hydrosilyl group, R ¹ is a monovalent to tetravalent hydrocarbon group having 2 to 150 carbon atoms,
a is an integer selected from 1 to 4, provided that when X contains only one hydrosilyl group, a is 2 or more)
As a specific example, a curing agent containing a hydrosilyl group represented by

[0020] In the general formula (1), X represents a group containing at least one hydrosilyl group, and specific examples thereof, for example _{-SiH n (CH 3) 3-} n, -SiH
_{n (C 2 H 5) 3} -n, -SiH n (C 6 H 5) 3-n (n
= 1 to 3), a hydrosilyl group containing only one silicon atom such as -SiH ₂ (C ₆ H ₁₃ ),

[0021]

[Chemical 1]

A hydrosilyl group containing two or more silicon atoms, such as

[0023]

[Chemical 2]

[0024]

[Chemical 3]

[0025]

[Chemical 4]

Examples thereof include hydrosilyl groups derived from various chain-like, branched-like, and cyclic polyvalent hydrogen siloxanes.

Of the various hydrosilyl groups mentioned above,
Since the hydrosilyl group-containing curing agent which is the component (A) is less likely to impair the compatibility with other organic polymers,
The portion containing a hydrosilyl group (which is usually contained in the form of an organosiloxane when the molecular weight is large) preferably has a molecular weight of 500 or less. Further, in consideration of the reactivity of the hydrosilyl group, preferable.

[0028]

[Chemical 5]

In the general formula (1), R ¹ has 2 to 150 carbon atoms.
And a polyoxyalkylene group (for example, a polyoxypropylene group) obtained by substituting some of the carbons in the main chain with oxygen.

When R ¹ is the above hydrocarbon group, specific examples are:

[0031]

[Chemical 6]

[0032]

[Chemical 7]

In addition, ethylene, propylene,
Polymerized with an olefinic compound having 2 to 6 carbon atoms such as 1-butene and isobutylene as a main monomer, and having 1 to 4 bonds, and a diene compound such as butadiene and isoprene alone. Polymerize,
The olefin-based compound and the diene-based compound are copolymerized and then hydrogenated, and examples thereof include those having 1 to 4 bonds.

Specific examples of the polyoxyalkylene group obtained by substituting oxygen for some of the carbons in the main chain of the hydrocarbon group are ethylene glycol, propylene glycol, 1-butene glycol and isobutylene glycol. Examples of such condensates include those having 1 to 4 bonds.

The method for producing the hydrosilyl group-containing curing agent as the component (A) is not particularly limited and may be produced by any method.

For example, (i) a method of treating a compound having a SiCl group in the molecule with a reducing agent such as LiAlH ₄ or NaBH ₄ to reduce the SiCl group in the compound to a SiH group, (ii) in the molecule a method of reacting a compound having both a functional group Y ¹ and a hydrosilyl group reactive with the functional group X ¹ in compound in a molecule having a functional group X ^1,
(Iii) A method of selectively hydrosilylating a polyhydrosilane compound having at least two hydrosilyl groups with respect to a compound containing an alkenyl group to leave a hydrosilyl group in the molecule after the reaction is exemplified.

Among the above methods, the method (iii) can be preferably used because the manufacturing process is generally simple. In this case, two or more of the hydrosilyl groups of some polyhydrosilane compounds may react with the alkenyl group of the compound containing an alkenyl group to increase the molecular weight, but those containing such an increased molecular weight are also included. Can be used as the component (A) without any problem.

In the present invention, a compound having a number average molecular weight of 500 to 3000, which is a polyoxypropylene polymer having at least two alkenyl groups in the molecule which is the component (B) together with the component (A), is used. To be done.

The component (B) is a component which is cured by a hydrosilylation reaction with the component (A) and has at least two alkenyl groups in the molecule, so that a hydrosilylation reaction occurs to form a polymer. , Cure.

The number of alkenyl groups contained in the component (B) is required to be at least two in view of the hydrosilylation reaction with the component (A), but from the viewpoint of rubber elasticity, alkenyl groups are present at both ends. Is preferred.

The repeating unit constituting the main chain of the component (B) is an oxypropylene unit, which has a specific resistance of 10 ⁸ to 10 ⁸ without adding the conductivity-imparting agent which is the component (D).
^{It is} preferable because it becomes ⁹ Ω · cm.

[0042] In this case, the main chain is a compound having two or more active hydrogen as a starting material, such as ethylene glycol, propylene glycol, bisphenol based compound, glycerine, trimethylol propane, etc. with pentaerythritol, C ₂ ~ It is produced by polymerizing a C ₄ alkylene oxide. Specific examples of the polymer constituting the main chain thus produced include polyethylene oxide, polypropylene oxide, polybutylene oxide and the like.

Regarding the method of introducing the alkenyl group into the polyoxypropylene polymer which is the main chain of the component (B), various proposed methods can be used.
It can be roughly classified into a method of introducing an alkenyl group after polymerization and a method of introducing an alkenyl group during polymerization.

As a method of introducing an alkenyl group after the polymerization, for example, the terminal, main chain or side chain hydroxyl group is converted to a group such as -ONa or -OK, and then the general formula (2): CH ₂ = CH-R. ² -Y ⁽²⁾ (in the formula, Y is a chlorine atom, a bromine atom, a halogen atom such as iodine atom, R ² is -R ³ -, - R ³ -OCO- or -R ³ -CO- (R ³ is A divalent hydrocarbon group having 1 to 20 carbon atoms, and preferable specific examples thereof include an alkylene group, a cycloalkylene group, an arylene group and an aralkylene group).

[0045]

[Chemical 8]

(R ⁴ is a hydrocarbon group having 1 to 10 carbon atoms is particularly preferable as a divalent group.) A polyoxypropylene group having a terminal alkenyl group is obtained by reacting an organic halogen compound represented by A polymer is produced.

In the present invention, the above-mentioned component (A), (B)
A hydrosilylation catalyst which is the component (C) is used together with the component.

The hydrosilylation catalyst as the component (C) is not particularly limited, and specific examples thereof include solid platinum supported on a carrier such as platinum, alumina, silica, carbon black, chloroplatinic acid, Examples include complexes of chloroplatinic acid with alcohols, aldehydes, ketones, platinum / olefin complexes, platinum / phosphite complexes, and the like.

The specific composition of the present invention is prepared from the components (A) to (C).

The proportions of the components (A) and (B) used are 0.2 to 5.0 moles of the hydrosilyl group in the component (A), and more preferably 0. 0 per mole of the alkenyl group in the component (B). It is preferable to use it in an amount of 4 to 2.5 mol from the viewpoint of rubber elasticity.

The amount of the hydrosilylation catalyst which is the component (C) is used in the range of 10 ^-1 to 10 ^-4 mol with respect to 1 mol of the alkenyl group in the component (B).

If necessary, the specific composition as described above includes a conductivity-imparting agent (component (D)) for imparting conductivity, a storage stability improver (component (E)), and further processability. Fillers, plasticizers, UV absorbers to improve costs and costs,
Lubricants, pigments, etc. are added.

Examples of the conductivity-imparting agent include, for example, carbon black and fine metal powder, and organic compounds containing quaternary ammonium salt group, carboxylic acid group, sulfonic acid group, sulfuric acid ester group, phosphoric acid ester group, and the like. Compounds or polymers, ether ester amides or ether amide imide polymers, ethylene oxide-epihalohydrin copolymers, compounds having a conductive unit typified by methoxy polyethylene glycol acrylate or organic antistatic agents such as polymer compounds can give.

As the carbon black, for example, those having an average particle size of about 15 to 19 mμ are preferably used, and specific examples thereof include EC carbon obtained by a thermal decomposition method.

Further, as the fine metal powder, for example, a metal powder having an average particle size of about 0.1 μm to 3 mμ is preferably used, and a specific example thereof is Ni powder.

The quaternary ammonium base (for example,

[0057]

[Chemical 9]

[0058] group, etc.), other carboxylic acid group (-COOH group, -COONa group also include carboxylate such as -COOK group), another sulfonic acid group (-SO ₃ H group, -SO ₃ Na group, a sulfonic acid base such as -SO ₃ K groups are also included), sulfate group (-OSO ₃ Na,
-OSO ₃ group, such as K), phosphoric acid ester group (-OPO
Examples of the organic compound or polymer containing a group such as ₃ K ₂ ) include quaternary ammonium chloride-containing organic compounds such as quaternary ammonium chloride, quaternary ammonium sulfate and quaternary ammonium nitrate, and polyvinylbenzyl. Polymers containing quaternary ammonium bases, such as type cations and polyacrylic acid type cations,
Carboxylic acid group-containing organic compounds such as alkali metal salts of higher fatty acids, carboxylic acid group-containing polymers such as ionomers, sulfonic acid group-containing organic compounds such as alkyl sulfonates and alkylbenzene sulfonates, polyvinylbenzyl type sulfonates, polyacrylic acid type sulfonates, etc. Examples thereof include sulfonic acid group-containing polymers, sulfuric acid ester group-containing organic compounds such as alkyl sulfates, and phosphoric acid ester group-containing organic compounds such as alkyl phosphates.

Besides the above compounds, amphoteric organic antistatic agents such as alkyl betaine type, alkyl imidazoline type, alkyl alanine type, polyoxyethylene alkyl amine, polyoxyethylene alkyl amide, polyoxyethylene alkyl ether, poly Nonionic organic antistatic agents such as oxyethylene alkyl phenyl ether, glycerin fatty acid ester and sorbitan fatty acid ester may also be used.

The ether ester amide or ether amide imide polymer has a group represented by an ether bond and an ester amide bond or an ether bond ester amide bond in the polymer, and imparts conductivity to the entire polymer. Is.

The ethylene oxide-epihalohydrin copolymer is a copolymer of epihalohydrin such as epichlorohydrin and ethylene oxide.

Further, the methoxypolyethylene glycol acrylate is a polymer of ester of methoxypolyethylene glycol and acrylic acid.

When the above-mentioned organic antistatic agent is a polymer, it is desirable that it is in a liquid state, so that the average molecular weight is preferably in the range of being in a liquid state.

When the compound which imparts conductivity, which is the component (D), is added to the specific composition comprising the components (A) to (C), the addition amount is 0.1 with respect to the component (B). ~
50% (% by weight, the same applies below), 0.2 to 20%
And is added so that the specific resistance of the cured product is 10 ³ to 10 ¹⁰ Ω · cm.

When carbon black or metal powder is used as the component (D), the specific resistance is mainly 10 ³ -10.
⁸ Ω · cm.

When the above-mentioned organic antistatic agent is added to the specific composition comprising the components (A) to (C), the addition amount is about 1 to 40% with respect to the component (B). Is 5 to 25%. In this case, set the specific resistance to 1
Mainly used to to 0 ⁷ ~10 ¹⁰ Ω · cm.

Examples of the organic antistatic agent include acrylic oligomers containing quaternary ammonium salt groups, carboxylic acid groups or sulfonic acid groups, maleimide copolymers, acrylimide copolymers, polyether ester amides, and poly (ether ester amides). Oligomers such as ether amide imide, ethylene oxide-epihalohydrin copolymer, and methoxy polyethylene glycol acrylate are preferably used.

Examples of the storage stability improver include, for example, compounds containing an aliphatic unsaturated bond, organic phosphorus compounds, organic sulfur compounds, nitrogen-containing compounds, tin compounds, organic peroxides and the like. To be Specific examples include, for example, benzothiazole, thiazole, dimethyl maleate, dimethyl acetylenedicarboxylate,
Examples include, but are not limited to, 2-pentenenitrile, 2,3-dichloropropene, quinoline and the like. Among these, thiazole, benzothiazole, and dimethylmalate are particularly preferable from the viewpoint of compatibility of pot life and rapid curing property.

The above-mentioned storage stability improvers may be used alone or in combination of two or more.

The component (E) can be used in an almost arbitrary amount as long as it is uniformly dispersed in the components (A) and (B). On the other hand, it is preferably used in the range of 10 ^-6 to 10 ^-1 mol. When the amount used is less than 10 ^-6 mol, the storage stability of the component (A) is not sufficiently improved, and when it exceeds 10 ^-1 mol, the curability may deteriorate.

The conductive roller of the present invention is used in the above-mentioned components (A) to (C) and, if necessary, used (D).
As described above, the specific composition containing the component, the component (E) and the like is used as a polyurethane foam, a chloroprene rubber,
By coating and curing on a roller having an elastic layer formed of a material other than the specific composition of the present invention, such as EP rubber, silicone resin, or the like, a tube-shaped material produced from the specific composition is used as the elastic material. By coating on a roller having a body layer, and further by using a specific composition to produce a roller having an elastic layer formed on a shaft, and on the surface of the roller further from a specific composition. It is obtained by providing a coating layer.

When the roller is manufactured by forming the elastic layer on the shaft as described above, for example, SUS is provided at the center.
It is used for an electronic copying machine or a printer by setting a shaft made of steel or iron, casting, injecting, extruding or the like a specific composition and heating and curing the composition at 30 to 150 ° C., preferably for 20 to 1 minute. Molded into a conductive roller. After semi-curing, it may be post-cured.

The specific resistance of the electroconductive roller of the present invention thus produced is preferably 10 ⁸ to 10 ¹⁰ Ω · cm, and is adjusted by adjusting the amount of the component (D).

Next, the conductive roller of the present invention will be described based on examples.

Example 1 Allyl-terminated polyoxypropylene obtained by reacting polyoxypropylene having hydroxyl groups at both ends with allyl chloride (number-average molecular weight of 3,000, content of terminal allyl groups per molecule: 2) 100 To 10 parts of a cyclic polysiloxane (LS3500 manufactured by Shin-Etsu Chemical Co., Ltd., containing 8 hydrosilyl groups per molecule), and polyoxypropylene (A-1) in which a cyclic hydropolysiloxane was introduced at the end. I got it.

Allyl-terminated polyoxypropylene (number average molecular weight of 3,000, terminal allyl group content of 2 per molecule)
Polyoxypropylene (A-1) 9 in which a cyclic hydropolysiloxane is introduced at the end with respect to 100 parts
Part, and 5 × 10 ⁻⁶ parts of chloroplatinic acid were added, and a 12 mmφ roller including a 6 mmφ SUS shaft at the center was manufactured by an injection method. Curing is 120 after molding
It was carried out by heating at ℃ for 3 minutes.

After being taken out from the mold, 100 parts of allyl-terminated polyoxypropylene (number average molecular weight of 1,000, content of terminal allyl groups per molecule of 2) was introduced into the above-mentioned poly (hydropolysiloxane) with cyclic hydropolysiloxane. A composition comprising 9 parts of oxypropylene (A-1) and 5 × 10 ⁻⁶ parts of chloroplatinic acid was coated on the roller surface by a roll coater method to form a surface layer having a thickness of 20 μm.

The hardness of the obtained roller according to the JIS A method (the hardness when a JIS A type hardness meter was pressed) was measured. The results are shown in Table 1.

Example 2 Allyl-terminated polyoxypropylene (number average molecular weight 1,0
00 to 100 parts of the terminal allyl group per molecule) and polyoxypropylene (A-) in which the cyclic hydropolysiloxane was introduced at the same end as used in Example 1.
1) 9 parts and 5 × 10 ⁻⁶ parts of chloroplatinic acid were added, and a 12 mmφ roller including a 6 mmφ SUS shaft at the center was manufactured by an injection method. Curing was performed by heating at 120 ° C. for 3 minutes after molding.

The hardness of the obtained roller according to the JIS A method (the hardness when the JIS A type hardness meter was pressed) was measured. The results are shown in Table 1.

Example 3 Silicone resin (KE126 manufactured by Shin-Etsu Chemical Co., Ltd.)
1-U) was coated on a 6 mmφ SUS shaft by an extrusion method to produce a 12 mmφ roller.

Allyl-terminated polyoxypropylene (number average molecular weight 1,000, terminal allyl group content 2 per molecule)
100 parts), 9 parts of polyoxypropylene (A-1) in which a cyclic hydropolysiloxane was introduced at the same end as used in Example 1 and 5 × 10 ⁻⁶ parts of chloroplatinic acid were added. The composition has a thickness of 50 on the surface of the roller.
It was coated to have a thickness of μm. Curing is 3 at 120 ℃ after molding
It was performed by heating for a minute.

The hardness of the obtained roller according to the JIS A method (the hardness when pressed by a JIS A type hardness meter) was measured. The results are shown in Table 1.

Comparative Example 1 Allyl-terminated polyoxypropylene (number average molecular weight 3,0
00, the content of terminal allyl groups per molecule (2 pieces) to 100 parts, and 9 parts of the polyoxypropylene (A-1) in which the cyclic hydropolysiloxane was introduced at the same end as used in Example 1, platinum chloride By adding 5 × 10 ⁻⁶ parts of acid, a 12 mmφ roller including a 6 mmφ SUS shaft at the center was manufactured by an injection method. Curing was performed by heating at 120 ° C. for 3 minutes after molding.

After taking out from the mold, a 3% alcohol solution of alcohol-soluble nylon was coated on the roller surface to form a nylon layer having a thickness of 50 μm.

The hardness of the obtained roller according to the JIS A method (the hardness when pressed by a JIS A type hardness meter) was measured. The results are shown in Table 1.

Comparative Example 2 Silicone resin (KE126 manufactured by Shin-Etsu Chemical Co., Ltd.)
1-U) was coated on a 6 mmφ SUS shaft by extrusion to form a 12 mmφ roller.

The surface of the obtained roller was coated with a 3% alcohol solution of alcohol-soluble nylon to form a nylon layer having a thickness of 50 μm.

The hardness of the obtained roller according to the JIS A method (the hardness when the JIS A type hardness meter was pressed) was measured. The results are shown in Table 1.

[0090]

[Table 1]

As is clear from Table 1, in the case of the roller of this embodiment, the surface layer can be formed without impairing the elasticity of the elastic body forming the roller.

[0092]

Since the conductive roller of the present invention does not impair the elasticity of the elastic layer constituting the conductive roller even after forming the surface layer, the conductive roller was used by being brought into contact with the photoreceptor of an electronic copying machine or printer. In that case, contact and driven rotation are stabilized, and a stable image can be obtained.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuyoshi Mimura 1-1-1, Hiei Tsuji, Otsu City, Shiga Prefecture Inside Kane Fuchi Kagaku Kogyo Co., Ltd. (72) Inoue Fukuda 1-1, Hiei Tsuji City, Shiga Prefecture Kane Fuchi Kagaku Kogyo Co., Ltd. (56) Reference JP-A-6-321382 (JP, A) JP-A-6-49347 (JP, A) JP-A-3-294320 (JP, A) JP-A-6- 155508 (JP, A) JP-A-6-157892 (JP, A) JP-A-6-41434 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03G 15/02 F16C 13 / 00 G03G 15/08 501 G03G 15/16 103 G03G 21/10

Claims (2)

(57) [Claims] 1. A conductive roller used in contact with a photoreceptor of an electrophotographic machine or a printer, at least a surface layer of which has a curing agent having at least two hydrosilyl groups in a molecule, and a molecule of (B). An electrically conductive roller comprising a cured product of a composition containing a compound having a number average molecular weight of 500 to 3000, which is a polyoxypropylene polymer having at least two alkenyl groups therein, and (C) a hydrosilylation catalyst. 2. The composition according to claim 1, further comprising (D)
The conductivity-imparting agent is added to 0.1 per 100 parts by weight of the component (B).
The conductive roller according to claim 1, which comprises a cured product of a composition added by 50 parts by weight.