JP2001316627A - Electrically conductive coating material and electrically conductive roller using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrically conductive coating material which has high uniformity of resistance and reduced moisture dependence and is suited in forming a coating film having good mold release characteristics, and an electrically conductive roller having a surface layer formed with the coating material. SOLUTION: This electrically conductive coating material is obtained by dissolving a silylated polymer obtained by reacting a PPG-based or PTMEG- based urethane prepolymer having an isocyanate group at the molecular terminal or in the side chain with a nearly equimolar silane coupling agent having an amino group, a hydrolytic catalyst for the silylated polymer, a quaternary phosphonium salt and, if necessary, an organo-polysiloxane having a silyl group in an organic solvent, and the electrically conductive roller is obtained by forming a surface layer with the above coating material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive paint suitably used for forming a surface layer of a conductive roller, which is a main component of an electrophotographic apparatus or an electrostatic recording apparatus. The present invention also relates to a conductive roller having a surface layer formed of the conductive paint.

[0002]

2. Description of the Related Art In an image forming apparatus such as an electrophotographic apparatus such as a copying machine or a printer or an electrostatic recording apparatus, an image carrier such as an electrophotographic photosensitive member or an electrostatic recording dielectric is brought into contact with an image carrier.
Conductive rollers such as a charging roller, a developing roller, and a transfer roller are used. These conductive rollers have a multilayer structure including a core provided in the center, a conductive elastic layer provided in a cylindrical shape around the core, and a surface layer provided on the outer periphery thereof. The elastic layer and the surface layer may each be further formed of two or more layers.

The main role of the surface layer is to (1) improve the uniformity of the resistance, and (2) enhance the releasability of toner particles and paper powder to prevent sticking.

Among the roles of the surface layer, it is particularly important to improve the uniformity of the resistance. The idea is that even if the conductive elastic layer is in a non-uniform conductive state, it is made uniform by the surface layer. Generally, the polymer itself such as rubber or resin used for the elastic layer or the surface layer is an insulator, so that carbon particles such as carbon black or graphite, Sn-Sb-based or Zn-Al-based for imparting conductivity. And conductive fine particles such as composite metal oxide fine particles. In that case, no matter what dispersing means is used, it is inevitable that the dispersion state of the conductive fine particles in the polymer becomes microscopically nonuniform. As a result of such non-uniform dispersion, a microscopic conductive path through which a current easily flows locally is formed, the uniformity of the resistance is impaired, and the effect appears as a decrease in image quality.

On the other hand, a method of imparting ionic conductivity by adding an electrolyte such as a metal salt, a quaternary ammonium salt, a quaternary phosphonium salt, or a metal complex, which can be expected to be more uniformly dispersed or dissolved, to a polymer has been studied. (For example, JP-A-10-48942, JP-A-9-101652)
JP, JP-A-9-302232, JP-A-9-2
7215, JP-A-8-220900, etc.). In this method, it is generally known that by imparting ionic conductivity, the hygroscopicity of the polymer is increased, and the humidity dependency of the resistance is increased, so that the image quality is largely influenced by environmental conditions. . Two factors can be considered as a cause of the increase in the hygroscopicity. First, in order to exhibit ionic conductivity, the matrix polymer must have the ability to ionically dissociate the electrolyte, and for this purpose it must contain polar groups in a dense manner. Such a polymer generally has a strong affinity for water and easily absorbs moisture. Second, the electrolyte itself generally has a strong affinity for water, which further enhances the hygroscopicity of the ionic conductive polymer.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is intended to form a coating film having high resistance uniformity, low humidity dependency, and good mold release properties. An object is to provide a suitable conductive paint.

Another object of the present invention is to provide a conductive roller having a surface layer having high uniformity of resistance, low dependency on humidity, and good releasability.

[0008]

The present invention relates to (1) a polymer (A) containing a polyether segment and having at least two isocyanate groups at a molecular terminal or a side chain.
And a silane coupling agent (B) having an amino group in the molecule, wherein the amino group in the silane coupling agent (B) is 0.8 to 1.2 per mole of the isocyanate in the polymer (A).
A silylated polymer having at least two silyl groups bonded to a hydrolyzable group and / or a hydroxyl group at a molecular terminal or a side chain, obtained by reacting moles.

(2) The hydrolysis catalyst for the silylated polymer, (3) a quaternary phosphonium salt, and, if desired, (4) a silyl group bonded to a hydrolyzable group and / or a hydroxyl group at the molecular terminal or side. An object of the present invention is to provide a conductive paint obtained by dissolving an organopolysiloxane having at least one chain in an organic solvent.

According to the present invention, there is further provided a conductive roller which is used in contact with the surface of an image carrier of an electrophotographic apparatus or an electrostatic recording apparatus, wherein at least a surface layer is made of a dried and cured product of the above conductive paint. Is provided.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The conductive paint of the present invention will be described in detail below for each constituent element.

Polymer (A) The polymer (A) is a polymer containing a polyether segment and having at least two isocyanate groups at molecular terminals or side chains. Polyether is a polymer with an ether bond in the skeleton.It coordinates the ions necessary to dissolve and dissociate the electrolyte and generate carriers, and fast movement of the molecular chains to move the generated carriers quickly. That is, it has a relatively low glass transition point Tg. Such a property is required for developing ionic conductivity. As a polymer having such a property, a polymer having an ester, an amine, a sulfide bond or the like in addition to the above-mentioned ether bond is known, but a polymer having an ether bond in terms of chemical stability or mechanical properties is known. Polymers are excellent.

The polyether polyol as a starting material for producing the above polyether segment includes:
1,2 obtained by ring-opening polymerization of ethylene oxide, propylene oxide and higher epoxides
-Polytetramethylene ether glycol (PTMEG) obtained by ring-opening polymerization of epoxide polymers (PEG, PPG, etc.) and cyclic ethers such as tetrahydrofuran
And the like are preferred.

The polymer (A) is reacted with the above polyether polyol by a stoichiometric excess of diisocyanate or triisocyanate having two or more isocyanate groups at the molecular terminal, and at least two diisocyanates or triisocyanates are added to the molecular terminal or side chain. It is a prepolymer having two isocyanate groups. Specific examples of the above diisocyanate or triisocyanate include tolylene diisocyanate (TDI), methylene diphenylene-4,4′-diisocyanate (MD
I) 1,5-Naphthalene diisocyanate (NDI), tolidine diisocyanate (TODI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (I
PDI), p-phenylene diisocyanate, transcyclohexane 1,4-diisocyanate, xylylene diisocyanate (XDI), lysine diisocyanate (LD
I), tetramethyl xylene diisocyanate (TMXD
I), lysine ester triisocyanate, 1,6,11
-Undecane triisocyanate, 1,8-diisocyanate-4-isocyanatomethyloctane, 1,3,6
-Hexamethylene triisocyanate, bicycloheptane triisocyanate, and trimethylhexamethylene diisocyanate (TMDI).

As an index relating to the molecular weight of the polymer (A), viscosity is usually used, and a polymer having a viscosity of 400 to 6000 CPS measured at 80 ° C. can be preferably used.
Industrial products in this range are commercially available as casting urethane prepolymers and are readily available.

Silane Coupling Agent (B) The silane coupling agent is generally

[0017]

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In the compound represented by the formula, X is an amino group,
OR is a hydrolyzable group such as a vinyl group, an epoxy group and a mercapto group, usually an alkoxy group such as a methoxy group and an ethoxy group, and R ′ is an alkyl group. n is 0 or 1.

The silane coupling agent (B) used in the present invention has an amino group as X, and is selected from (2-aminoethyl) aminopropyltrialkoxysilane,
—Aminopropyl trialkoxysilane and the like are preferred.

Silylated polymer When the above polymer (A) and the silane coupling agent (B) are mixed, the amino group quickly reacts with the isocyanate group to form a urea bond, and as a result, the molecule of the polymer (A) A silylated polymer having a hydrolyzable group and / or a silyl group bonded to a hydroxyl group introduced into a terminal or a side chain is obtained. The silylated polymer is a main component of the conductive paint of the present invention, and can be crosslinked and cured by adding an appropriate hydrolysis catalyst and water. That is, the hydrolysis of the silyl group is represented by the following formula.

[0021]

Embedded image

In this way, a silyl group bonded to a hydroxyl group is formed, and these form a cross-linking by the polycondensation reaction as shown in the following formula.

[0023]

Embedded image

The silylated polymer obtains the flexibility, releasability, mechanical strength, and chemical stability required for the surface layer by crosslinking, and decreases the water absorption. That is, crosslinking is used as a means for reducing the water absorption of a polyether segment having a relatively high affinity for water. This makes it possible to provide suitability as a matrix polymer for an ionic conductor having a low resistance of the resistance to humidity.

The mixing ratio of the polymer (A) and the silane coupling agent (B) is such that the isocyanate group in the polymer (A) is 1
It is 0.8 to 1.2 moles per mole of the amino group in the silane coupling agent (B). Usually equimolar is desirable,
If the ratio is outside the range of 0.8 to 1.2, problems such as inhibition of curing of the silylated polymer occur.

The mixing of the polymer (A) and the silane coupling agent (B) is usually performed in the presence of a suitable solvent. As the solvent, any solvent may be used as long as it is chemically inert to the above two components and dissolves both and the resulting silylated polymer. For example, methyl acetate, ethyl acetate, butyl lactone Esters, such as acetone, methyl ethyl ketone, cyclohexanone, acetophenone, etc., hydrocarbons such as n-hexane, cyclohexane, toluene, etc., ethers such as diisopropyl ether, tetrahydrofuran, dioxane, chloromethane, dichloromethane, 1,2 dichloroethane , Halogenated hydrocarbons such as chlorobenzene, nitriles such as acetonitrile and propionitrile, N,
Examples include amides such as N-dimethylformamide and acetamide, and sulfur-containing compounds such as dimethyl sulfoxide and sulfolane.

Hydrolysis catalyst In order to cure the silylated polymer, a catalyst for hydrolyzing silyl groups contained in the polymer is required. As such catalysts, metal halides such as ferric chloride and tin chloride and metal chelate compounds such as aluminum acetylacetonate are preferred. In addition, any acid / base catalyst usually used in the sol-gel method can be used. These catalysts are preferably added in an amount of 0.0001 to 1 part by weight based on 100 parts by weight of the silylated polymer.

Quaternary phosphonium salts Carrier ions are generated in electrolytes such as metal halides, quaternary ammonium salts, quaternary phosphonium salts, and metal complexes, and are dissolved in the crosslinked silylated polymer at the molecular level. Some produce a homogeneous complex. The resistance of such a uniform composite can be expected to be highly uniform.

Among the above-mentioned various electrolytes, quaternary ammonium salts and quaternary phosphonium salts, in particular, have an affinity for an organic polymer because of having an organic group in a molecule, and thus form a highly uniform complex.

When used as a paint, the electrolyte must not be decomposed by heating in applications where the coating is dried and cured by heating. It is known that quaternary ammonium salts generally decompose at 100 to 150 ° C., and are inferior in heat resistance.

On the other hand, the decomposition temperature of the quaternary phosphonium salt is usually 250 ° C. or higher, and is excellent in heat resistance. For these reasons, quaternary phosphonium salts are particularly suitable as the electrolyte for conductive coatings of the present invention.

On the other hand, the range of the volume resistivity required for the surface layer of the conductive roller is usually 10 ⁷ to 10 ¹¹ Ω · cm.
Usually, it is necessary to add a large amount of the above electrolyte. However, the electrolyte generally has a strong affinity for water, and when added in a large amount, the hygroscopicity (or water absorbency) of the composite rapidly increases, and therefore the humidity dependence of resistance increases. This is because an electrolyte capable of realizing low resistance with a small amount of addition or an electrolyte having low affinity for water is desired.

Further, the reason why the resistance is reduced by the absorption of water by the ionic conductive polymer is that the dissociation degree of the electrolyte increases due to the strong coordination ability of water to ions, and therefore,
It is estimated that the carrier ion concentration increases. If there is an electrolyte that can achieve low resistance with a small amount of addition as described above, it means that the degree of dissociation in the matrix polymer is originally sufficiently high, and changes in the degree of dissociation due to water absorption Is expected to be relatively small, and therefore the humidity dependence of the resistance will be small.

If an electrolyte having a low affinity for water is present, it is expected that the degree of dissociation due to moisture absorption will be small, and that the resistance will be less dependent on humidity.

Among the quaternary phosphonium salts, a quaternary phosphonium salt having at least three phenyl groups has a specific property that low resistance can be realized by adding a relatively small amount and that the affinity for water is low. The present invention has been found to be an electrolyte and to dissolve in the silylated polymer to form a uniform complex, thereby completing the present invention.

The quaternary phosphonium salts having at least three phenyl groups include, for example, tetraphenylphosphonium salts, ethyltriphenylphosphonium salts, butyltriphenylphosphonium salts, benzyltriphenylphosphonium salts, methyltriphenylphosphonium salts and the like. One or a mixture of two or more can be suitably used in the present invention, and these are commercially available. Among the above quaternary phosphonium salts, tetraphenylphosphonium salts have particularly low affinity for water, and among them, tetraphenylphosphonium bromide is particularly preferred in that it is disclosed as an existing chemical substance.

In the present invention, the quaternary phosphonium salt is preferably used in an amount of 0.005 per 100 parts by weight of the polymer (A).
-10 parts by weight are added. If the amount is less than 0.005 parts by weight, a sufficiently low resistance cannot be expected. If the amount exceeds 10 parts by weight, a part of the quaternary phosphonium salt may not be dissolved in the matrix polymer, and may be non-uniform.

[0038] As organopolysiloxane above, since one of the roles of the surface layer is anti-sticking, such as toner particles and paper dust to the roller surface, when it is necessary to enhance this feature, hydrolyzed An organopolysiloxane having at least one silyl group bonded to a functional group and / or a hydroxyl group at a molecular terminal or a side chain can be added. As such an organopolysiloxane, various ones can be used.
Methoxy-terminated polydimethylsiloxane DMS-X1 sold by Gelest (Azmax Co., Ltd.)
1. Silanol-terminated polydimethylsiloxane DMS-S1
2, S15 and the like can be suitably used in the present invention. Further, TSF4701 manufactured by Toshiba Silicone Co., Ltd. is also suitable.

The organopolysiloxane is covalently incorporated into the polymer chain network through a silyl group or a silanol group by a reaction similar to the cross-linking reaction of the silylated polymer to form a highly uniform polymer alloy. . As a result, the high release property of the organopolysiloxane can be imparted to the surface layer, and thus, the performance of preventing adhesion of toner particles, paper powder, and the like is enhanced.

The number average molecular weight of the above organopolysiloxane is preferably from 400 to 4,000. If it is less than 400, it is difficult to expect sufficient releasability, and if it exceeds 4,000, the uniformity of the produced polymer alloy may be deteriorated.

The addition amount of the organopolysiloxane is preferably from 0 to 10 parts by weight based on 100 parts by weight of the polymer (A). If the amount exceeds 10 parts by weight, the uniformity of the produced polymer alloy may deteriorate.

Conductive paint When the above components are mixed to form a conductive paint, the solvent used for mixing the polymer (A) and the silane coupling agent (B) is removed by a method such as distillation. May be
Usually, it is used as it is as one component of the coating material, and if necessary, the same or different solvent can be added. There is no limitation on the type of solvent to be added, and one of the above-mentioned solvents may be used, and methanol, ethanol,
Alcohols such as isopropanol may be used.
One of the advantages of the present invention is that a solvent such as ethanol, which has relatively low toxicity and which does not easily penetrate into a lower layer such as an elastic layer, can be used.

Further, necessary and sufficient water for hydrolysis may be added to the conductive paint. However, in order to sufficiently extend the pot life of the paint, it is preferable to supply water from outside the paint film by adding water vapor to the gas phase during drying and curing without adding water to the paint.

After applying the paint of the present invention to the roller, 30
By drying and curing at ~ 150 ° C, a highly uniform conductive coating film having sufficient mechanical strength and releasability can be formed.

The conductive roller present invention, at least the surface layer of the conductive roller to be used is brought into contact with the image bearing member surface having the electrophotographic apparatus or an electrostatic recording apparatus, formed by drying the cured product of the aforementioned conductive coating The present invention also provides a conductive roller having the above configuration.

When the elastic layer is a foamed rubber, usually,
The unevenness of the surface of the elastic layer is large, and a roller having a smooth surface cannot be obtained even if a coating material is applied directly on the surface. In such a case, the elastic layer is covered with a tubular conductive intermediate layer. By applying the conductive paint of the present invention on the intermediate layer, a conductive roller having a smooth surface can be obtained. The intermediate layer can be formed of various materials, and a thermoplastic elastomer is advantageous in terms of simplicity of the production process. Among thermoplastic elastomers, nitrogen- and / or oxygen-containing thermoplastic elastomers such as urethane-based, polyamide-based, and polyester-based thermoplastic elastomers are particularly preferable in consideration of the adhesiveness to the conductive paint of the present invention.

If the elastic layer is formed of solid rubber and has a smooth surface, the conductive paint of the present invention can be directly applied thereon.

[0048]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples, but the present invention is not limited to the following Examples.

First, a conductive roller in which a conductive elastic layer is covered with a tubular conductive intermediate layer will be described. An EPDM compound containing appropriate amounts of Ketjen Black, a foaming agent, a foaming aid, a softening agent, a reinforcing agent, a vulcanizing agent, etc. is formed into a cylindrical shape on the outer peripheral surface of a metal core (SUS φ6 mm).
It was foamed and vulcanized by heating. The shape was adjusted by polishing to obtain an elastic layer having a thickness of 3 mm and a volume resistivity of 5 × 10 ⁴ Ω · cm.

Next, a polyurethane-based thermoplastic elastomer (hardness JIS A = 80, heat deformation temperature ASTM D-648 = 9)
(0 ° C.) and an appropriate amount of Ketjen Black, and melt-kneaded at 180 ° C. for 10 minutes using a pressure kneader to obtain a conductive compound. The obtained conductive compound was extruded by an extruder to an inner diameter of 10 mm, a thickness of 150 μm, and a length of 250 μm.
It was formed into a seamless tube of mm. The volume resistivity of the tube was 1.5 × 10 ⁷ Ω · cm.

Air was blown into the seamless tube to insert the elastic layer having the core metal while expanding the outer diameter, thereby obtaining a conductive roller in which the elastic layer was covered with the tubular intermediate layer. In the following Examples and Comparative Examples, a conductive roller was completed by forming a conductive surface layer on the roller manufactured as described above. The roller was used as a charging roller and evaluated by the following method.

The roller resistance is determined by winding a 10 mm wide aluminum foil on a roller, applying a DC voltage of 250 V between the core metal and the aluminum foil, and measuring the current to determine the resistance between the core metal and the aluminum foil. It was measured by calculating. The roller resistance was measured in each of the following environments.

Standard environment (N / N): 23 ° C., 55% RH High temperature and high humidity environment (H / H): 32.5 ° C., 80% RH Low temperature and low humidity environment (L / H): 15 ° C., 10% RH The water absorption was used as an index indicating the hygroscopicity of the surface layer. The water absorption was calculated by immersing a film having a thickness of 100 μm produced by a solution casting method of a paint in water at 25 ° C. for 20 hours and measuring a change in weight.

The evaluation of the microscopic uniformity of the resistance of the surface layer was made by measuring the non-uniformity of the initial output image when a conductive roller was mounted on an electrophotographic printer cartridge and only a DC voltage of 1.05 kV was applied. Was visually determined.

To evaluate the releasability of the conductive roller surface, a standard voltage with AC / DC superimposed was applied to the printer,
After outputting 000 images, the conductive roller was removed, and the adhesion of fine powder to the surface layer was visually observed.

Example 1 In a 500 ml separable flask equipped with a condenser, a PTMEG urethane prepolymer (Takenate L2690 manufactured by Takeda Pharmaceutical Co., Ltd., NCO content = 4.2%, viscosity = 8)
(00 CPS @ 80 ° C) 40 g of dehydrated 50 g ethyl acetate
And a mixed solution consisting of 11.3 g of 3-aminopropyltriethoxysilane and 7 g of dehydrated ethyl acetate was added at room temperature with stirring. There was considerable heat generation, the liquid temperature rose to 40 ° C., and the viscosity also increased. However, the stirring was continued for 2 hours without special cooling. This reaction produced a silylated polymer. Then, dehydrated ethanol 100 g, tetraphenylphosphonium bromide (Hokko Chemical Industry Co. TTP -PB) 1.4 g, stannic chloride _{(SnCl 4 · 5H 2 O)} 0.1g and methoxy terminated polydimethylsiloxane (Gelest Inc. DMS-X11, molecular weight 90
(0-1000) was added to obtain a conductive paint of the present invention. The paint was a clear, colorless viscous solution. 5 ℃
For 24 hours and then used. The volume resistivity of the coating film dried and cured by the solution casting method is 5.
4 × 10 ⁸ Ω · cm and the water absorption was 2.6%.

The above-mentioned paint is applied to the conductive roller covered with the tubular conductive intermediate layer by a dipping method.
After drying at 0 ° C. for 30 minutes, it was cured by heating at 100 ° C. for 45 minutes. During drying and heating, water necessary for hydrolysis of the silylated polymer and the organopolysiloxane was supplied by coexisting water vapor in an air atmosphere.

Thus, a conductive roller having a surface layer formed of the conductive paint of the present invention was completed.

Example 2 PPG urethane prepolymer (Takenate L-1150 manufactured by Takeda Pharmaceutical Co., Ltd., NCO content = 5.7%, viscosity = 850 cps)
(@ 80 ° C.) 50 g was dissolved in 40 g of dehydrated ethyl acetate,
Under stirring, a mixed solution of 15.0 g of 3-aminopropyltriethoxysilane and 7 g of dehydrated ethyl acetate was added thereto at room temperature. By continuing stirring for 2 hours, a silylated polymer was produced. Thereafter, 100 g of dehydrated ethanol and tetraphenylphosphonium bromide 1.
4 g and stannic chloride (SnCl ₄ .5H ₂ O) 0.1 g were added to obtain a conductive paint of the present invention. The paint was a clear, colorless viscous solution. After standing at 5 ° C. for 24 hours, it was used. The volume resistivity of the dried and cured coating is 4.3 ×
10 ⁸ Ω · cm and the water absorption was 3.3%. The conductive roller of the present invention was obtained by applying the composition to the roller under the same conditions as in Example 1, drying and curing.

Example 3 A conductive paint of the present invention was obtained in the same manner as in Example 1 except that methoxy-terminated polydimethylsiloxane was not added. The coating film dried and cured by the solution casting method had a volume resistivity of 6.0 × 10 ⁸ Ω · cm and a water absorption of 2.3%. The conductive roller of the present invention was obtained by applying the composition to the roller under the same conditions as in Example 1, drying and curing.

Comparative Example 1 A conductive paint was obtained in the same manner as in Example 3 except that 5 g of lithium chloride was added instead of tetraphenylphosphonium bromide. The volume resistivity of the coating film dried and cured by the solution casting method is 5.3 × 10 ⁸ Ω · cm,
The water absorption was 8.7%. The conductive roller of the present invention was obtained by applying the composition to the roller under the same conditions as in Example 1, drying and curing.

Comparative Example 2 A conductive paint was obtained in the same manner as in Example 3 except that 5 g of tetrabutylammonium bromide was added instead of tetraphenylphosphonium bromide. The coating film dried and cured by the solution casting method had a volume resistivity of 5.6 × 10 ⁸ Ω · cm and a water absorption of 20.4%. A conductive roller was obtained by applying the composition to the roller under the same conditions as in Example 1, drying and curing.

Comparative Example 3 Instead of tetraphenylphosphonium bromide,
Tin oxide conductive fine particles (SN-100, manufactured by Ishihara Sangyo) 1
A conductive paint was obtained in the same manner as in Example 3 except that 7 g was added. The coating film dried and cured by the solution casting method had a volume resistivity of 4.7 × 10 ⁸ Ω · cm and a water absorption of 7.2%. A conductive roller was obtained by applying the composition to the roller under the same conditions as in Example 1, drying and curing.

The conductive rollers prepared in the above Examples and Comparative Examples were mounted on an electrophotographic printer cartridge and evaluated by the above-described method. Table 1 shows the results.

[0065]

[Table 1]

[0066]

According to the present invention, a coating film formed by the conductive paint of the present invention has a small resistance dependency on humidity, has a high degree of uniformity of resistance, and has good releasability.

Further, the conductive roller coated with the coating material of the present invention to form a surface layer can achieve a desired resistance level as the surface layer without deteriorating the humidity dependence of the resistance, and can achieve uniform resistance and separation. Excellent moldability.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03G 15/02 101 G03G 15/02 101 4J038 15/08 501 15/08 501D 15/16 103 15/16 103 F-term (reference) 2H003 BB11 CC05 2H032 AA05 BA19 2H077 AD06 EA15 FA13 FA25 GA02 3J103 AA02 AA51 FA07 FA30 GA02 GA52 GA74 HA03 HA20 HA41 HA44 4J005 AA03 AA04 AA06 BD05 BD08 4J038 DG091GA11 GA03 GA03 GA03 GA03 PB06 PB11 PC07

Claims (14)

[Claims] (1) a polyether segment,
And a polymer (A) having at least two isocyanate groups at the molecular terminals or side chains and a silane coupling agent (B) having an amino group in the molecule per 1 mole of isocyanate groups in the polymer (A) The silane coupling agent (B) has at least two hydrolyzable groups and / or hydroxyl-bonded silyl groups at the molecular terminals or side chains, which are reacted at a ratio of 0.8 to 1.2 mol of amino groups. Silylated polymer. (2) A conductive paint obtained by dissolving the hydrolysis catalyst for a silylated polymer and (3) a quaternary phosphonium salt in an organic solvent. 2. The conductive paint according to claim 1, further comprising (4) an organopolysiloxane having at least one silyl group bonded to a hydrolyzable group and / or a hydroxyl group at a molecular terminal or a side chain. 3. The polyether is at least one selected from the group consisting of polyoxypropylene glycol and polytetramethylene ether glycol.
Or the conductive paint according to 2. 4. The conductive paint according to claim 1, wherein the silane coupling agent (B) is 3-aminopropyl trialkoxysilane. 5. A polymer (A) having an isocyanate group
The conductive paint according to any one of claims 1 to 4, wherein the viscosity measured at 80 ° C is 400 to 6000 CPS. 6. The conductive paint according to claim 1, wherein the quaternary phosphonium salt has at least three phenyl groups. 7. The conductive paint according to claim 1, wherein the quaternary phosphonium salt is a tetraphenylphosphonium salt. 8. The conductive paint according to claim 1, wherein the quaternary phosphonium salt is tetraphenylphosphonium bromide. 9. A quaternary phosphonium salt formed from polymer (A) 10
The conductive paint according to any one of claims 1 to 8, which contains 0.005 to 10 parts by weight based on 0 part by weight. 10. The method according to claim 2, wherein the number average molecular weight of the organopolysiloxane is from 400 to 4000.
The conductive paint according to Item. 11. The conductive paint according to claim 2, wherein the organopolysiloxane contains 10 parts by weight or less based on 100 parts by weight of the polymer (A). 12. A conductive roller according to claim 1, wherein at least a surface layer of a conductive roller used in contact with an image carrier surface of an electrophotographic apparatus or an electrostatic recording apparatus is used. A conductive roller made of a cured product of the above. 13. The conductive roller according to claim 12, wherein the surface layer is formed on a tubular intermediate layer. 14. The conductive roller according to claim 12, wherein the tubular intermediate layer is formed of a nitrogen- and / or oxygen-containing thermoplastic elastomer.