JP2000302974A - Curable electroconductive composition and electroconductive rubber roller using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a curable electroconductive composition having a good handleability as liquid and a good processability and capable of providing an electroconductive material excellent in heat resistance, weather resistance, water resistance and chemical resistance and having small change of resistance due to environmental variation by using a saturated hydrocarbon-based polymer as a main component. SOLUTION: This composition consists essentially of (A) a saturated hydrocarbon-based polymer having at least one alkenyl group capable of carrying out hydrosilylation reaction in the molecule, (B) a compound having at least two silicon atom-bonded hydrogen atoms in the molecule, (C) a compound having at least one alkenyl group capable of carrying out hydrosilylation reaction and having a molecular weight lower than that of the component A, (D) carbon black and (E) a hydrosilylation catalyst. Since the composition combinedly uses the component A and the component C having lower molecular weight than the component A, the composition has low viscosity and ready handleability as liquid and is suitable for liquid injection molding, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a curable conductive composition and a conductive rubber roller using the same.
More specifically, the present invention relates to a curable conductive composition which is addition-curable and can be formed by injection molding or the like, and a conductive rubber roller using the same.

[0002]

2. Description of the Related Art One use of a conductive composition is OA
And various rollers used in electrophotographic machines, printers and the like. By using a saturated hydrocarbon polymer for these rollers, excellent heat resistance, weather resistance, water resistance,
It can be expected that it has chemical resistance and the change in resistance due to environmental fluctuations is small.

When the composition is in a liquid state, one of the methods for producing a roller is liquid injection molding. In using this molding method, the viscosity of the liquid composition is important from the viewpoint of productivity. . A curable conductive composition using a saturated hydrocarbon polymer has already been disclosed in JP-A-8-2.
Although it is disclosed in Japanese Patent No. 62866 or the like, since the main component of this conductive material is a polymer, depending on the type of the polymer, the viscosity of the composition in an uncured state becomes extremely high, and as a liquid May be difficult to handle. In particular, when an isobutylene-based polymer is used as the main component, the viscosity is high, and there is also a thickening due to the addition of carbon black as a conductivity-imparting agent, so that the flowability of the composition is reduced and the processability is poor. There were drawbacks. It is also possible to use a plasticizer to solve the problem of high viscosity, but in order to achieve a lower viscosity, it is necessary to add a very large amount of plasticizer, such a The conductive material obtained from the composition has problems such as bleeding of a plasticizer.

[0004]

The object of the present invention is to provide a conductive material having excellent heat resistance, weather resistance, water resistance, and chemical resistance and having a small change in resistance due to environmental fluctuation. When a saturated hydrocarbon polymer is used as the polymer, the problem that the composition before curing becomes high due to the polymer as the main component and the carbon black added as the conductivity-imparting agent is used in a very large amount of plasticizer. It is an object of the present invention to provide a curable conductive composition which can be easily solved as a liquid, can be easily handled as a liquid, and can improve processability, and a conductive rubber roller using the same.

[0005]

DISCLOSURE OF THE INVENTION The present inventors have developed a curable composition comprising a saturated hydrocarbon polymer having an alkenyl group capable of performing a hydrosilylation reaction, and components such as a curing agent having a hydrosilyl group and a hydrosilylation catalyst. In the above, by using in combination with at least one compound having one or more alkenyl groups capable of hydrosilylation reaction in the molecule and having a lower molecular weight than the saturated hydrocarbon polymer, handling as a liquid with low viscosity And a curable conductive composition suitable for liquid injection molding or the like can be obtained. That is, the present invention relates to (A) a saturated hydrocarbon polymer having at least one alkenyl group capable of hydrosilylation in a molecule; and (B) a compound having at least two silicon-bonded hydrogen atoms in a molecule. C) a compound having at least one alkenyl group capable of undergoing a hydrosilylation reaction in the molecule and having a lower molecular weight than the polymer of the component (A); (D) carbon black; and (E) a catalyst for hydrosilylation. A curable conductive composition comprising (E) as an essential component and a conductive rubber roller using the same.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the composition of the present invention, the component (A) is a saturated hydrocarbon polymer having at least one alkenyl group capable of undergoing a hydrosilylation reaction in a molecule.
Here, the saturated hydrocarbon polymer is a concept meaning a polymer that does not substantially contain a carbon-carbon unsaturated bond other than an aromatic ring except for an alkenyl group. It means that the constituting repeating unit is constituted by a hydrocarbon group.

The alkenyl group is not particularly limited as long as it is a group containing a carbon-carbon double bond that is active in a hydrosilylation reaction. Examples of the alkenyl group include an aliphatic unsaturated hydrocarbon group such as a vinyl group, an allyl group, a methylvinyl group, a propenyl group, a butenyl group, a pentenyl group, and a hexenyl group, a cyclopropenyl group, a cyclobutenyl group, a cyclopentenyl group, and a cyclohexenyl group. And the like, a cyclic unsaturated hydrocarbon group, a methacryl group and the like.
The component (A) in the present invention desirably has the alkenyl group capable of hydrosilylation reaction at the polymer terminal. When the alkenyl group is at the terminal of the polymer as described above, the amount of the effective network chain of the finally formed cured product is increased, and a high-strength rubbery cured product is easily obtained.

[0008] The polymer constituting the skeleton of the saturated hydrocarbon polymer as the component (A) includes (1) an olefin compound having 2 to 6 carbon atoms such as ethylene, propylene, 1-butene, isobutylene or the like as a main monomer. (2) homopolymerization of a diene-based compound such as butadiene, isoprene or the like, or copolymerization of the olefin-based compound and the diene-based compound, followed by hydrogenation. However, isobutylene-based polymers, hydrogenated polybutadiene-based polymers, and hydrogenated polyisoprene can be easily introduced into the terminal, the molecular weight can be easily controlled, and the number of terminal functional groups can be increased. Desirably, it is a system polymer.

In the isobutylene-based polymer, all of the monomer units may be composed of isobutylene units, and the monomer units having copolymerizability with isobutylene are preferably 50% ( % By weight, the same applies hereinafter), more preferably 30% or less, particularly preferably 20% or less.

The monomer units copolymerizable with isobutylene include, for example, olefins having 4 to 12 carbon atoms, vinyl ethers, aromatic vinyl compounds, vinyl silanes and allyl silanes. Specific examples of such a copolymer unit include, for example, 1-butene, 2-butene,
-Methyl-1-butene, 3-methyl-1-butene, pentene, 4-methyl-1-pentene, hexene, vinylcyclohexane, methyl vinyl ether, ethyl vinyl ether, isobutyl vinyl ether, styrene, α-methylstyrene, dimethylstyrene, p -T-butoxystyrene, p-hexenyloxystyrene, p-allyloxystyrene, p-hydroxystyrene, β-pinene, indene, vinyldimethylmethoxysilane, vinyltrimethylsilane, divinyldimethoxysilane, divinyldimethylsilane, 1,3- Divinyl-1,1,3,3-tetramethyldisiloxane, trivinylmethylsilane, tetravinylsilane, allyldimethylmethoxysilane, allyltrimethylsilane, diallylmethoxysilane, diallyldimethylsilane , Γ-methacryloyloxypropyltrimethoxysilane, γ-methacryloyloxypropylmethyldimethoxysilane, and the like.

In the hydrogenated polybutadiene-based polymer and other saturated hydrocarbon-based polymers, similarly to the case of the isobutylene-based polymer, in addition to the monomer unit serving as the main component,
Other monomer units having copolymerizability may be contained.

In the present invention, the saturated hydrocarbon polymer used as the component (A) includes butadiene, isoprene, 1,13-tetradecadiene, 1,9-butadiene as long as the object of the present invention is achieved. Decadiene, 1,7-octadiene,
A small amount of a monomer unit such as a polyene compound such as 1,5-hexadiene having a carbon-carbon double bond remaining after polymerization, preferably 10% or less may be contained.

The number average molecular weight (Mn; GPC method, calculated as polystyrene) of the saturated hydrocarbon polymer, preferably isobutylene polymer, hydrogenated polyisoprene or hydrogenated polybutadiene polymer as the component (A) is as follows: 2000 to 50 in view of its ease of handling and rubber elasticity after curing.
It is preferably about 000.

The method for producing the component (A) of the present invention includes:
JP-A-3-152164 and JP-A-8-13422
A method disclosed in, for example, Japanese Patent Application Publication No. 0-200, etc., involves reacting a polymer having a functional group such as a hydroxyl group with a compound having an unsaturated group to introduce an unsaturated group into the polymer. Also, a method of performing a Friedel-Crafts reaction with alkenyl phenyl ether to introduce an unsaturated group into a polymer having a halogen atom, a method of performing a substitution reaction with allyltrimethylsilane in the presence of a Lewis acid, various phenols and Friedel A method in which a crafts reaction is performed to introduce a hydroxyl group, and then the above-described alkenyl group introduction method is used in combination. Further, U.S. Pat. No. 4,316,973,
It is also possible to introduce a method of introducing an unsaturated group at the time of polymerization of a monomer as disclosed in JP-A-105005 and JP-A-4-288309.

In the composition of the present invention, the component (B) is used as a curing agent, and the compound of the component (B) contains at least two silicon-bonded hydrogen atoms in the molecule. If so, there is no particular limitation on the type.
Here, two silicon-bonded hydrogen atoms may be bonded to the same silicon atom, and in this case also, two silicon-bonded hydrogen atoms are calculated.

As the component (B), polyorganohydrogensiloxane is one of the preferable ones. The term "polyorganohydrogensiloxane" as used herein refers to a siloxane compound having a hydrocarbon group or a hydrogen atom on a silicon atom. To show the structure specifically,

[0017]

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A chain-like or cyclic one represented by the above, or two or more of these units

[0019]

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And the like.

In using these components (B), compatibility with the components (A), (C) and (E),
Alternatively, those having good dispersion stability in the system are preferable. In particular, when the viscosity of the entire system is low, if a component having low compatibility with the above components is used as the component (B), phase separation may occur to cause poor curing. Further, a filler having a small particle size such as fine powder silica may be blended as a dispersing aid.

The component (A), the component (C) and the component (E) have relatively good compatibility or dispersion stability with the component (E).
Specifically shown as a component,

[0023]

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And the like.

The amount of the component (B) used in the present invention is such that the silicon-bonded hydrogen atom of the component (B) is 0.8 to 0.8% based on the total amount of the olefins of the components (A) and (C).
It is preferable to use so as to have 5.0 equivalents.
(A), (C) relative to the total amount of olefins of each component (B)
When the silicon-bonded hydrogen atoms of the component are less than 0.8 equivalent, crosslinking becomes insufficient. If it exceeds 5.0 equivalents, there is a problem that physical properties are greatly changed due to the influence of silicon-bonded hydrogen atoms remaining after curing. In particular, when it is desired to suppress the influence of the silicon-bonded hydrogen atoms remaining after the curing, the silicon-bonded hydrogen atoms are 1.0 to 1.0 with respect to the total amount of the alkenyl groups of the component (A).
It is preferable to use the component (B) so as to have 2.0 equivalents.

In the composition of the present invention, the compound (C) having at least one alkenyl group capable of undergoing a hydrosilylation reaction in the molecule, which is the component (C), reduces the viscosity of the composition before curing and cures the composition. At the time of the reaction, it is bonded to the Si—H group of the component (B), which is a curing agent, by a hydrosilylation reaction, and is finally taken into the structure of the composition after curing. Therefore, in the present invention, there is no particular limitation as long as it is an organic compound having at least one hydrosilylatable alkenyl group in the molecule and having a lower molecular weight than the polymer of the component (A). From the viewpoint of good compatibility with the component (A) of the present invention, hydrocarbon compounds having low polarity are preferred. It is preferable that the component (C) does not have a carbon-carbon unsaturated bond having low activity for hydrosilylation.

When a compound having a low boiling point which is likely to be volatilized during curing and curing is used as the component (C), the compound may change its shape before and after curing, or may adversely affect the environment due to volatiles. Therefore, a hydrocarbon compound having 6 to 20 carbon atoms is preferable, and a hydrocarbon compound having 8 to 20 carbon atoms is particularly preferable.

When a compound having at least two hydrosilylation-reactive alkenyl groups in the molecule is used as the component (C), in addition to the above effects, (B)
The number of functional groups at the crosslinking point can be increased by performing a hydrosilylation reaction with the component. However, in this case, if a large amount of a compound having at least two alkenyl groups capable of hydrosilylation reaction in the molecule is added as the component (C), the tensile modulus of the cured product becomes large and the cured product becomes hard and brittle. The amount is relatively small.

As the compound of the component (C), the viscosity of the composition before curing is significantly reduced, and the three-dimensional crosslinked structure is formed to ensure the reliability of the conductive composition after curing. An α-olefin having 6 to 20 carbon atoms;
It is preferable to use a compound having at least two alkenyl groups capable of performing a hydrosilylation reaction in a molecule.

Specific examples of the component (C) include those having 6 to 6 carbon atoms.
20, preferably an α-olefin having 8 to 18 carbon atoms, styrene, α-methylstyrene, α-methylstyrene dimer, allylcyclopentane, vinylcyclohexane,
Tetramethyldivinylsiloxane as a bifunctional one,
Bisphenol A diallyl ether, bisphenol F
Diallyl ether, 1,7-octadiene, 1,9-decadiene, pentaerythritol diallyl ether, divinylbenzene, trimethylolpropane diallyl ether, 1,9-nonanediol diallyl ether, 1,
9-nonanediol dimethacrylate, trifunctional trimethyltrivinylcyclosiloxane, triallyl trimellitate, pentaerythritol triallyl ether, 1,2,4-trivinylcyclosiloxane,
Examples of the functional group include tetramethyltetravinylcyclosiloxane, and examples of the multifunctional group include 1,2-polybutadiene oligomer, but are not limited thereto.

The amount of the component (C) added is within a range that does not prevent the formation of a three-dimensional crosslinked structure by the hydrosilylation reaction between the saturated hydrocarbon polymer as the component (A) and the curing agent as the component (B). If so, there is no particular limitation. That is, (C)
When the addition amount of the component becomes excessive, the Si-
The H group is consumed by the hydrosilylation reaction with the unsaturated group of the component (C), and the formation of the three-dimensional crosslinked structure by the component (A) may be insufficient. The compound of the component (C) is used in an amount of 0.1 to 100 parts by weight of the polymer of the component (A).
It is preferable to use 100 parts by weight, preferably 0.5 to 70 parts by weight, particularly preferably 1 to 50 parts by weight.

In the composition of the present invention, the component (D) carbon black is used as a component (A) in the cured product obtained from the curable composition of the present invention containing a saturated hydrocarbon polymer as a main component. It is a component for imparting conductivity. Examples of the carbon black include furnace black, acetylene black, lamp black, channel black, thermal black, and oil black. The type and particle size of these carbon blacks are not limited, but the volume resistivity of the cured composition is 10 ⁵ Ωcm to 10 ¹² Ωc.
It is preferable to add m. Component (D) is added in an amount of 0.1 to 100 parts by weight of the polymer of component (A).
It is preferable to use 1 to 200 parts by weight, more preferably 1 to 100 parts by weight. If the addition amount is too small, the conductivity of the conductive material obtained after curing of the composition tends to vary, and if the addition amount is too large, the fluidity of the composition is impaired and the processability is reduced. Will be invited. Also, depending on the type or amount of carbon black used,
Since some substances inhibit the hydrosilylation reaction, the effect of the carbon black on the hydrosilylation reaction must be considered.

The hydrosilylation catalyst as the component (E) of the present invention is not particularly limited, and any catalyst can be used. Specifically, chloroplatinic acid, a simple substance of platinum,
Solid platinum supported on a carrier such as alumina, silica or carbon black; platinum-vinylsiloxane complex {for example, Pt _n (ViMe ₂ SiOSiMe ₂ Vi) n, P
t [(MeViSiO) _{4] m};} platinum - phosphine complex {for _{example, Pt (PPh 3) 4,} Pt (PBu 3) 4}; platinum - phosphite complex {for example, Pt [P (OP
h) ₃ ] ₄ , Pt [P (OBu) ₃ ] ₄ (wherein Me represents a methyl group, Bu represents a butyl group, Vi represents a vinyl group, Ph represents a phenyl group, and n and m represent integers)} , Pt (aca
c) ₂ , also Ashby et al., US Pat.
No. 1 and U.S. Pat. No. 3,159,662;
and platinum alcoholate catalysts described in U.S. Pat. No. 3,220,972 to Amoreaux et al.

As an example of a catalyst other than a platinum compound,
Is RhCl (PPh_Three)_Three, RhCl _Three, Rh / Al
_TwoO_Three, RuCl_Three, IrCl_Three, FeCl_Three, AlCl_Three,
PdCl_Two・ 2H_TwoO, NiCl_Two, TiCl_Four, Etc.
Can be These catalysts may be used alone or in combination of two or more.
You may use together. Among them, from the viewpoint of catalytic activity
Chloroplatinic acid, platinum-olefin complex, platinum-vinylsilo
Xan complex, Pt (acac)_TwoAre preferred. Catalyst amount
Is not particularly limited, but the alkenyl in the component (A)
10 per mole of group^-1-10^-8Used in the molar range
Is good. Preferably 10^-2-10^-6Use in mole range
Is good. Also, hydrosilylation catalysts are generally expensive.
It is corrosive and generates a large amount of hydrogen gas, causing
May be foamed.^-1Do not use more than mole
Better.

In the present invention, the curable composition is cured by the addition reaction of the Si-H group to the alkenyl group using a noble metal catalyst, so that the curing speed is very high, which is convenient for performing line production.

Further, the curable conductive composition of the present invention includes:
For the purpose of improving the storage stability, a storage stability improver can be used. The storage stability improver is a usual stabilizer known as a storage stabilizer of the component (B), which is a curing agent in the curable conductive composition of the present invention,
There is no particular limitation as long as the intended purpose is achieved. Specifically, a compound containing an aliphatic unsaturated bond, an organic phosphorus compound, an organic sulfur compound, a nitrogen-containing compound, a tin compound, an organic peroxide, or the like can be preferably used. More specifically, 2-benzothiazolyl sulfide, benzothiazole, thiazole, dimethylacetylene dicarboxylate, diethylacetylene dicarboxylate, butylhydroxytoluene, butylhydroxyanisole, vitamin E,
(4-morphodinyldithio) benzothiazole, 3-
Methyl-1-buten-3-ol, acetylenically unsaturated group-containing organosiloxane, ethylenically unsaturated group-containing organosiloxane, acetylene alcohol, 3-methyl-1-butyl-3-ol, diallyl fumarate, diallyl maleate , Diethyl fumarate, diethyl maleate, dimethyl maleate, 2-pentenenitrile,
Examples include, but are not limited to, 2,3-dichloropropene.

Further, the curable conductive composition of the present invention includes:
If necessary, various types of supports used in the production of the conductive rubber roller, for example, a metal core, a plastic film, a metal foil, a tackifier for improving the adhesion to paper, etc., adding a tackifier resin. Can be. Examples of the adhesion-imparting agent include various silane coupling agents and epoxy resins. In particular, a silane coupling agent having a functional group such as an epoxy group, a methacryloyl group, or a vinyl group has a small effect on the curability of the composition, has a large effect on the adhesiveness, and is easy to use. However, usable silane coupling agents are not limited to these. These reaction catalysts can be added in combination with a silane coupling agent or an epoxy resin. Furthermore, nitrogen-containing silane compounds, antioxidants, ultraviolet absorbers,
Pigments, surfactants and the like can be appropriately added. In using these, the influence on the hydrosilylation reaction must be considered. The tackifier resin is not particularly limited, and those usually used as a tackifier can be used. Specific examples include phenolic resins, modified phenolic resins, cyclopentadiene-
Phenol resin, xylene resin, cumarone resin, petroleum resin, terpene resin, terpene phenol resin, rosin ester resin and the like can be mentioned. Of these, terpene resins and petroleum resins are preferred because they have particularly good compatibility and good adhesive properties.

Further, the curable conductive composition of the present invention includes:
Various fillers, antioxidants, ultraviolet absorbers, pigments, surfactants, solvents, and silicon compounds may be appropriately added. Specific examples of the filler include fine powder of silica, calcium carbonate, clay, talc, titanium oxide, zinc white, diatomaceous earth, and barium sulfate. Among these fillers, in particular, silica fine powder, especially having a particle size of 50 to 7
Fine powder silica of about 0 nm (BET specific surface area of about 50 to 380 m ² / g) is preferable. Among them, hydrophobic silica subjected to surface treatment has a great effect of improving the strength of the composition after curing in a preferable direction, and is particularly preferable. preferable.

Further, the curable conductive composition of the present invention includes:
A softener or a plasticizer may be added for the purpose of adjusting the viscosity before curing or the hardness after curing, or stabilizing the resistance value. The amount of the softener and the plasticizer is preferably 150 parts by weight or less based on 100 parts by weight of the component (A). If the addition amount exceeds that, there is a possibility that problems such as bleeding may occur.

In the present invention, since a saturated hydrocarbon polymer is used as the component (A), the conductive composition after curing has excellent heat resistance, weather resistance, water resistance and chemical resistance. It can be applied to a wide range of applications. Furthermore, when an isobutylene-based polymer is used as the component (A), a conductive material excellent in low moisture permeability, low moisture absorption, and low gas permeability in addition to the above characteristics can be obtained.

[0041]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

(Example 1) As the component (A), a compound which is an allyl-terminated isobutylene polymer having the following structure and synthesized according to the method described as Production Example 3 in JP-A-8-134220 A was used.
Table 1 shows the analysis values of Compound A.

[0043]

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[0044]

[Table 1]

First, 10 parts of compound A as component (A)
With respect to 0 parts by weight, 35 parts by weight of octadecene (Linearen 18 manufactured by Idemitsu Petrochemical) and 15 parts by weight of bisphenol A diallyl ether (manufactured by Mitsui Chemicals) as the component (C), and carbon black (Asahi Carbon Co., Ltd.) as the component (D) # 35) 48 parts by weight and MAR as an antioxidant
One part by weight of KAO-50 (manufactured by Asahi Denka) was mixed and kneaded three times with a roll. Next, as a component (B), a compound B1 having a silicon-bonded hydrogen atom having the following structure was added to this mixture.

[0046]

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Was mixed with 55 parts by weight based on 100 parts by weight of compound A of component (A). Further, bis (1,3-divinyl-1,1,3,3-tetramethyldisiloxane) platinum complex catalyst (17.9 × 10 ⁻⁵ mmol) is used as the component (E).
/ Μl, xylene solution) is 5 × 10 5 based on the number of moles of alkenyl groups in component (A) and component (C).
^-4 equivalents, and 30 molar equivalents of dimethyl maleate as a storage stability improver with respect to platinum were weighed and uniformly mixed. The composition was defoamed for 10 minutes using a vacuum defoaming stirrer (manufactured by C-Tech Co., Ltd.). This composition was filled in an aluminum mold frame covered with a Teflon sheet, and then heated at 180 ° C. for 30 minutes in a hot air dryer. As an evaluation of processability, after mixing and defoaming the composition, it was measured using an E-type viscometer at a temperature of 23 ° C. and a rotation speed of 5 rpm. , Δ (relatively good), × (slightly hard to flow). Further, the volume resistivity of the obtained sheet-shaped cured product was measured at a temperature of 23 ° C. and a humidity of 65.5%. Table 2 shows the composition of the composition and the evaluation results.

(Comparative Example 1) A hydrocarbon-based process oil (PW-38 manufactured by Idemitsu Petrochemical) was used as a plasticizer with respect to 100 parts by weight of the same compound A as the component (A).
0), 20 parts by weight of carbon black (# 35, manufactured by Asahi Carbon Co.) as the component (D), and 1 part by weight of MARK AO-50 (manufactured by Asahi Denka) as an antioxidant, and mixed on a roll. And kneaded three times. Compound B2 which is a component (B) having the following structure is added to this mixture.

[0049]

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Was mixed with 100 parts by weight of component (A) in an amount of 5.3 parts by weight. Furthermore, bis (1,3-
Divinyl-1,1,3,3-tetramethyldisiloxane) platinum complex catalyst (17.9 × 10 ⁻⁵ mmol / μl,
Xylene solution) in an amount such that platinum becomes 5 × 10 ^-4 equivalents to the number of moles of the alkenyl group in the component (A), and dimethyl maleate as a storage stability improver is added in an amount of 30.
The molar equivalents were weighed and mixed homogeneously. Next, the composition was defoamed for 10 minutes using a vacuum defoaming stirrer (manufactured by C-Tech Co., Ltd.). After filling this composition into an aluminum mold frame covered with a Teflon sheet, the composition was heated to 180 ° C in a hot air drier.
Heated for 0 minutes. Workability and volume resistivity were evaluated in the same manner as in Example 1. Table 2 shows the composition of the composition and the evaluation results.

[0051]

[Table 2]

[0052]

According to the present invention, a curable conductive composition having a low viscosity and easy to handle as a liquid can be obtained, and the productivity of the conductive material can be improved by injection molding or the like. Further, by using the curable conductive composition of the present invention, it is possible to obtain a conductive rubber roller that can be expected to have excellent characteristics such as a small change in resistance due to environmental fluctuation.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Junji Takase 1-2-80 Yoshida-cho, Hyogo-ku, Kobe-shi, Hyogo BB18W BL01W BL013 BL02W CP04X DA037 DA118 DD078 EA016 EA026 EA046 ED026 EH136 EX016 FD117 FD14X FD206 FD208 GM00

Claims (12)

[Claims] 1. A curable conductive composition comprising the following components (A) to (E) as essential components. (A) a saturated hydrocarbon polymer having at least one hydrosilylation-reactive alkenyl group in the molecule; (B) a compound having at least two silicon-bonded hydrogen atoms in the molecule; and (C) a compound having at least two silicon-bonded hydrogen atoms in the molecule. A compound having one hydrosilylation-reactive alkenyl group and having a lower molecular weight than the polymer of component (A) (D) carbon black (E) hydrosilylation catalyst 2. The saturated hydrocarbon polymer as the component (A),
The curable conductive composition according to claim 1, wherein the curable conductive composition has an alkenyl group capable of hydrosilylation reaction at a molecular terminal. 3. The saturated hydrocarbon polymer as the component (A)
The curable conductive composition according to claim 1, which is an isobutylene-based polymer. 4. The isobutylene-based polymer of the component (A),
The curable conductive composition according to claim 3, wherein the total amount of the repeating units derived from isobutylene is 50% by weight or more. 5. The curable conductive composition according to claim 1, wherein the compound as the component (B) is a polyorganohydrogensiloxane containing at least two silicon-bonded hydrogen atoms in one molecule on average. . 6. The compound (C) having a molecular weight of 200
The curable conductive composition according to claim 1, which is 0 or less. 7. The curable conductive composition according to claim 6, wherein the compound (C) has a molecular weight of 400 or less. 8. The compound of component (C) having 6 to 20 carbon atoms.
The curable conductive composition according to claim 1, 6 or 7, which is an α-olefin. 9. The compound of component (C), wherein the compound has 6 to 6 carbon atoms.
The curable conductive composition according to claim 1, 6 or 7, wherein 20 alpha-olefins and a compound having at least two alkenyl groups capable of hydrosilylation in the molecule are used in combination. 10. The compound of component (B) has a silicon-bonded hydrogen atom of 0.8 to 5 equivalents to the total amount of olefins of each of the components (A) and (C), and the compound of component (C) has a content of (A) 0.1 to 100 parts by weight per 100 parts by weight of the polymer of the component,
The component (D) carbon black is 0.1 to 200 parts by weight based on the polymer of the component (A), and the catalyst of the component (E) is 10 ^-1 to 10 ^-8 based on the alkenyl group of the component (A). The curable conductive composition according to claim 1, wherein the components (A) to (E) are blended in a molar amount. 11. The cured composition has a volume resistivity of 10 ^5.
10 setting conductive composition according to claim 10, wherein a ¹² [Omega] cm. 12. A conductive rubber roller using the curable conductive composition according to claim 1.