JP3261475B2 - Rubber composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber composition containing fluororubber as a base material, and more particularly to a rubber composition which is most suitable for forming an outermost layer of a roll such as a developing roll which comes into contact with toner. it relates to things.

[0002]

2. Description of the Related Art In an electrophotographic copying machine or the like, for a roll such as a developing roll which comes into contact with toner, it is required as an important characteristic to prevent the toner from adhering to the roll surface. For this reason, the outermost layer of such a roll is formed using a fluororubber composition having excellent release properties, and in order to further improve this release property, the fluororubber composition is used as a release agent. Contains silicone oil.

[0003]

However, since the compatibility between the fluororubber and the silicone oil is poor, the silicone oil may form a large aggregate and exist in the fluororubber matrix. In such a state, for example, in the developing roll of the electrophotographic copying machine, the supply of silicone oil to the roll surface becomes uneven,
As a result, toner adheres to the portion where the silicone oil is insufficient, and this becomes a starting point, which further spreads the toner adherence, and eventually causes toner filming.

[0004] The present invention has been made in view of such circumstances, and has as its object to provide a rubber composition capable of forming an outermost layer of a roll having excellent toner releasability.

[0005]

In order to achieve the above object, the rubber composition of the present invention comprises fluororubber as a matrix component, in which particles formed from a release agent are dispersed. A rubber composition, wherein the release agent comprises the following (a) and (b), particles formed from the release agent are fixed by reaction in the fluororubber matrix, and have a particle size of: When the cross-sectional areas of the particles having a size of 0.1 μm or more are measured and sequentially accumulated in ascending order, the particle size at the point where the cumulative cross-sectional area is 90% of the total cumulative cross-sectional area is 8%. Ru bet a configuration that it is ~30μm. (A) Reactive silicone oil or reactive fluorine oil. (B) Non-reactive silicone oil or non-reactive fluorine oil [however, the same type as (a) is used].

In the present invention, "the particles are fixed by reaction" means that the fluororubber molecules constituting the matrix are
Reacts with reactive silicone oil etc. that forms particles,
It means that both are chemically bonded and fixed. It is not necessary that all the reactive silicone oils and the like are chemically bonded to the fluororubber. If the reactive silicone oils and the like mainly located on the surface of the particles are chemically bonded, the release agent particles are reactively fixed in the fluororubber matrix. It is done. The fluororubber matrix includes both a state in which the fluororubber molecules are not crosslinked and a state in which the fluororubber molecules are crosslinked by vulcanization. Therefore, the rubber composition of the present invention may be unvulcanized or vulcanized.

Further, in the present invention, "the particle size is 0.1 μm
"A case where the cross-sectional areas of the particles having m or more are measured and the cross-sectional areas are sequentially accumulated in ascending order of size" means the following case. That is, in the fluororubber composition, the cross-sectional area of the particles having a particle size of 0.1 μm or more is measured. This particle size refers to the maximum particle size of the particles. For example, if the cross-sectional shape of the particle is circular, the diameter becomes the particle size, and if the cross-sectional shape of the particle is elliptical, the long diameter becomes the particle size. This measurement can be performed, for example, by observing the fluororubber composition with a scanning electron microscope. This observation does not need to be performed for the entire rubber composition, and may be partially performed by determining an observation location (sampling location). The number of sampling points is preferably 4 to 30, particularly preferably 20 to 30. The calculation of the cross-sectional area is performed according to the cross-sectional shape of the particle. For example, the cross-section of the particle may be subdivided to calculate the area of each part, and these may be summed to obtain the cross-sectional area of each particle. Then, the cross-sectional areas are sequentially accumulated in ascending order, and the total accumulated cross-sectional area is calculated.

[0008] Then, "90
% Of particles having a cumulative cross-sectional area of 8% to 30%
“μm” means the following. That is, a cumulative sectional area of 90% of the total cumulative sectional area is derived. Then, the particle size of the particle at the point where the cumulative cross-sectional area is 90% (hereinafter referred to as “90% cumulative cross-sectional particle size”) is obtained. An example of this is shown in the graph of FIG. In this graph, the vertical axis indicates the cumulative cross-sectional area ratio (%), and the horizontal axis indicates the particle diameter (μm) and the particle cross-sectional area (μm ² ). As shown in the figure, when the particles are sequentially accumulated in ascending order of decreasing cross-sectional area, a curve is obtained in which the cumulative cross-sectional area ratio increases as the particle size (cross-sectional area) increases. Then, as shown by the dotted line, the particle size of the particle at the point corresponding to the 90% cumulative sectional area is determined. And if the particle diameter of the particles at this point is 8 to 30 μm, the requirements of the present invention are satisfied.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, the present invention specifies the state of a release agent in a fluororubber matrix in a fluororubber composition. That is, a mixture of a reactive oil (a) and a non-reactive oil (b) (both are the same type) is used as a release agent, and particles of the release agent are reactively fixed in a fluororubber matrix. Have been. This is shown in the schematic diagram of FIG. 1. In the fluororubber matrix 1, particles 2 formed from a release agent such as reactive silicone oil react with the fluororubber molecules 1 a and are chemically bonded. . This chemical bond varies depending on the type of reactive group such as reactive silicone oil. As described above, the particle size distribution of the particles 2 is 90%.
% Cumulative cross-sectional area is 30 μm or less, and is uniformly dispersed. In this case, for example, if the outermost layer of the developing roll is formed using this rubber composition, the reactive silicone oil or the like as the release agent does not ooze out as large aggregates. As a result, the developing roll maintains high toner releasability for a long period of time, thereby preventing occurrence of toner filming.

Next, the present invention will be described in detail.

The rubber composition of the present invention comprises a fluororubber and a release agent such as a reactive silicone oil, and is reactively fixed in a fluororubber matrix such that the release agent has a specific particle size. Have been.

The fluororubber is not particularly limited and conventionally known ones can be used. However, tetrafluoroethylene-polypropylene (TFE-PP) is used because of its low polymer viscosity and good dispersibility of the filler. ) It is preferable to use a copolymer, and it is particularly preferable to use a random copolymer having a structure represented by the following general formula (1).

[0013]

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In the above formula (1), the proportion of each of the repeating parts m, n, and p is represented by a weight ratio of m: n: p = (30 to 30).
60): (10 to 40): It is preferable to use one set to (10 to 40), and particularly preferably, m:
n: p = (30-50) :( 30-40) :( 20-3
0).

Next, the following release agents (a) and (b) are used as the release agent to be mixed with the fluororubber. (A) Reactive silicone oil or reactive fluorine oil. (B) Non-reactive silicone oil or non-reactive fluorine oil [however, the same type as (a) is used].

The reactive silicone oil and the reactive fluorine oil used as (a) are both at least one selected from the group consisting of a hydroxyl group, an amino group, a mercapto group, an epoxy group, a carboxyl group and a methacryl group. Those having a reactive group are preferred. These reactive groups react with the fluororubber, whereby
The particles formed from the oil are fixed in the fluoro rubber matrix. The mode of this reaction fixing (chemical bonding) is shown below for each of the above reactive groups.

[Hydroxy group]

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[Amino group]

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[Mercapto group]

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[Epoxy group]

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[Carboxyl group]

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[Methacryl group]

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These reactive groups are located at the terminal (including both terminals) and side chains of the molecular chain, and differ depending on the type of oil and the like.

Of the above reactive groups, a hydroxyl group, an amino group, and a mercapto group are preferred because of their good reactivity with fluororubber, and an amino group is particularly preferred. Further, for reasons of thermal stability, the average molecular weight of the reactive silicone oil is preferably 300 or more, and the average molecular weight of the reactive fluorine oil is preferably 200 or more, and particularly preferably, both have an average molecular weight of 1500 to 20,000. Further, the total compounding ratio of these reactive silicone oil and reactive fluorine oil is 100% of fluoro rubber.
The range is preferably from 0.5 to 100 parts, more preferably from 15 to 50 parts, by weight (hereinafter abbreviated as "part").

Specific examples of such reactive silicone oils and reactive fluorine oils are shown below.

[Reactive Silicone Oil Having Hydroxyl Group]

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[Reactive Silicone Oil Having Amino Group]

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[Reactive Silicone Oil Having Mercapto Group]

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[Reactive Silicone Oil Having Epoxy Group]

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[Reactive Silicone Oil Having Carboxyl Group]

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[Reactive Silicone Oil Having Methacrylic Group]

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[Reactive Fluorine Oil Having a Hydroxyl Group]

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[Reactive Fluorine Oil Having Amino Group]

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[Reactive Fluorine Oil Having Mercapto Group]

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[Reactive Fluorine Oil Having Epoxy Group]

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[Reactive Fluorine Oil Having Carboxyl Group]

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[Reactive Fluorine Oil Having Methacryl Group]

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Among the reactive silicone oils and reactive fluorine oils shown in the above specific examples, preferred are:
From the viewpoint of reactivity, those having a hydroxyl group, an amino group, and a mercapto group are preferable, and those having an amino group are particularly preferable.

Further, the rubber composition of the present invention may be used in combination with the reactive silicone oil or the reactive fluorine oil (a) to form the rubber composition (b), ie, the non-reactive silicone oil or the non-reactive silicone oil. Fluorine oil is blended. Note that the same type as the above (a) is used for the above (b). That is, when a reactive silicone oil is used as the above (a), a non-reactive silicone oil is used as the above (b), and when a reactive fluorine oil is used as the above (a), the above (b) As the non-reactive fluorine oil. In addition, these non-reactive silicone oils and non-reactive fluorine oils
Although it does not have a reactive group for reaction-fixing in the fluororubber matrix, it is fixed in the fluororubber matrix when used in combination with the above reactive silicone oil. This is because non-reactive silicone oil and the like are mixed in particles formed from the reactive silicone oil and the like, and the two are combined, and as a result, the non-reactive silicone oil and the like are fixed in the fluororubber matrix. It is inferred. Therefore, even if non-reactive silicone oil or the like is used, there is no possibility that large aggregates will be generated if the amount is a predetermined amount.

The non-reactive silicone oil preferably has at least one organic group selected from the group consisting of an alkyl group, an aralkyl group, a higher alcohol ester group and a polyether fluoroalkyl group. This is because these are highly effective as release agents.

Among the non-reactive silicone oils, those having an average molecular weight in the range of 500 to 100,000 are preferable, and particularly preferable are those having an average molecular weight of 2,000 to 50,000, because of their high releasability and thermal stability. Of the range.

The mixing ratio of the non-reactive silicone oil is usually 10 to 1 with respect to 100 parts of the fluororubber.
It is set in the range of 00 parts, preferably in the range of 20 to 50 parts, particularly preferably in the range of 30 to 40 parts.

Specific examples of such a non-reactive silicone oil are shown below.

[Non-reactive Silicone Oil Having an Alkyl Group]

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[Non-reactive Silicone Oil Having Aralkyl Group]

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[Non-reactive Silicone Oil Having Higher Alcohol Ester Group]

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[Non-reactive Silicone Oil Having Polyether Fluoroalkyl Group]

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Among the non-reactive silicone oils shown as specific examples, because of their high mold release properties,
It is preferable to use those containing an alkyl group, a higher alcohol ester group, and a polyether fluoroalkyl group, and particularly preferable are those having a higher alcohol ester group.

As the non-reactive fluorine oil, perfluoropolyether or the like is used.

The rubber composition of the present invention has an appropriate volume electric resistance (10 ⁷ to 10 ¹² Ω · c) in addition to the above materials.
For the purpose of imparting m), an ionic conductive agent can be blended. The characteristic relating to the volume electric resistance is important, for example, as the characteristic of the outermost layer of the developing roll.

Examples of the ionic conductive agent include trimethyl octadecyl ammonium chloride, benzyl trimethyl ammonium chloride, trioctyl propylene ammonium chloride, trioctyl propyl ammonium bromide, trimethyl octadecyl ammonium perchlorate, tetrabutyl ammonium hydrogen sulfate, and tetrabutyl ammonium Quaternary ammonium compounds such as hydroxides and perchlorates, benzoates of these quaternary ammonium compounds,
Nitrite, sulfate, hydroxide and the like. These may be used alone or in combination of two or more. Above all,
It is preferable to use tetrabutylammonium hydrogen sulfate (TBAHS) or tetrabutylammonium hydroxide.

Further, in addition to the above-mentioned ionic conductive agents, acid acceptors such as calcium hydroxide, magnesium oxide, calcium oxide, lead tan, and litharge; and vulcanizing agents such as peroxide, bisphenol A, bisphenol AF, and hexamethylene diamine. Can be appropriately compounded as needed. As will be described later, it is preferable that the vulcanizing agent is added each time the rubber composition of the present invention is used (before coating).

Next, the rubber composition of the present invention can be produced using the above-mentioned materials, for example, by the following method (first method).

That is, first, the fluororubber is kneaded in an internal mixer (for example, a Banbury mixer). An acid acceptor is added thereto, and after kneading, the reactive oil (a) and the non-reactive oil (b) and other components are added and kneading is continued. Then, the kneading is stopped after the torque of the kneading machine is increased, and the kneaded material is taken out. Then, the kneaded material is sheeted by an open roll.
Next, this is dissolved in a solvent to prepare a rubber composition (coating liquid). Examples of the solvent include ethyl acetate, methyl ethyl ketone, methanol, toluene, isopropyl alcohol, methyl cellosolve, and dimethylformamide. These may be used alone or in combination of two or more. At this stage, it is preferable that the vulcanizing agent is not blended, but blended before use (before coating).

The rubber composition of the present invention can be produced by the following method (second method) in addition to the above-mentioned production method.

That is, first, the fluororubber is dissolved in the solvent. Examples of the solvent include ethyl acetate, methyl ethyl ketone, methanol, toluene, isopropyl alcohol, methyl cellosolve, and dimethylformamide. These may be used alone or in combination of two or more. Then, the reactive oil (a), the non-reactive oil (b), and other components are blended in the dissolved fluororubber. Then, stirring is performed under heating to increase the viscosity, and when the viscosity becomes constant, the stirring is stopped to prepare a rubber composition (coating liquid). In addition,
The heating conditions are preferably in the range of 40 ° C. or higher and the boiling point of the solvent or lower, particularly preferably in the range of 50 to 80 ° C.
In addition, at the time of this adjustment, it is preferable that the vulcanizing agent is not blended, but blended before use (before coating). The increase in viscosity during the stirring is presumed to be due to the finer particles (increase in the total surface area) of the reactive silicone oil and the like and the chemical bond between the reactive silicone oil and the like and the fluororubber molecules. The constant viscosity varies depending on the material to be used and the like, but is usually 2000 to 20000 cps, and preferably 3000 to 5000 cps.

In the rubber composition thus obtained,
Particles formed from a reactive silicone oil or the like (release agent) in the fluororubber matrix are uniformly dispersed with a 90% cumulative sectional area particle size of 8 to 30 μm, and the fluororubber matrix (fluororubber molecule) (See FIG. 1). As a result, as mentioned earlier,
The releasability is maintained for a long time without generating large aggregates such as reactive silicone oil. In addition, the particle size of the particles is preferably 0.1 to 20 μm,
Particularly preferably, it is 0.75 to 5 μm.

Next, an example in which this rubber composition is applied to the formation of the outermost layer of a developing roll will be described.

As the developing roll, one having a three-layer structure as shown in FIG. 2 can be used. As shown in the figure, the developing roll includes an innermost layer 11 formed of an elastic body, an intermediate layer 12, and an outermost layer 13 formed of a fluororubber composition on the outer periphery of a shaft body 10 such as a cored bar. .

The three-layered developing roll is manufactured as follows. That is, first, a material for forming the innermost layer and the intermediate layer is prepared.

The components of the material for forming the innermost layer and the intermediate layer are not particularly limited, and those conventionally known can be used.

For example, as each component of the material for forming the innermost layer, there can be mentioned those obtained by blending carbon black with ethylene-propylene rubber (EPDM), styrene-butadiene rubber (SBR), silicone rubber, polyurethane elastomer or the like.

As each component of the material for forming the intermediate layer,
For example, EPDM, SBR, nitrile rubber, hydrogenated nitrile rubber, polyurethane elastomer, polyester, N-methoxymethylated nylon, and the like are mixed with a conductive agent such as carbon black, metal oxide, or quaternary ammonium salt. .

A conventionally known method is applied to the method of preparing the material for forming the innermost layer and the intermediate layer. To give an example, first, the innermost layer forming material (compound form)
Is prepared by kneading the above components with a kneader such as a kneader. The material for forming the intermediate layer (coating liquid)
Is prepared by kneading with a ball mill or a roll, adding a solvent to the mixture, and mixing and stirring.

Next, an innermost layer and an intermediate layer are formed on the outer periphery of the shaft body by a conventional method, and a roll base is manufactured. For example, as shown in FIG.
Then, a compound-like innermost layer forming material is poured into the cylindrical mold 16, and the upper lid 17 is fitted over the cylindrical mold 16. In this state, the entire roll mold is heated (vulcanization treatment, conditions: 150 to
(200 ° C. × 20 to 40 minutes) to form the innermost layer. Next, the shaft on which the innermost layer is formed is released from the mold, and the residue of the vulcanizing agent is removed by evaporation, if necessary. Then, an intermediate layer forming material (coating liquid) is applied to the outer peripheral surface of the innermost layer, and dried and heated (vulcanization, conditions: 120 to 200 ° C. × 1).
(0 to 30 minutes) to form an intermediate layer. The above coating is
Conventionally known coating methods such as a dipping method, a spray method, and a roll coating method can be applied. In this way, a roll base having the innermost layer and the intermediate layer formed on the outer periphery of the shaft body is manufactured.

On the other hand, a vulcanizing agent is added to the rubber composition (coating solution) of the present invention. Then, the rubber composition is applied to the outer peripheral surface of the intermediate layer of the roll base. The coating method is not particularly limited, and a conventional method such as a dipping method, a spray method, a roll coating method, or the like can be applied.
Then, after coating, by performing drying and heat treatment (vulcanization treatment, conditions: 150 to 200 ° C. × 20 to 40 minutes), the solvent in the rubber composition is removed by evaporation and the fluorine rubber component is crosslinked. . In this way, a developing roll having a three-layer structure as shown in FIG. 2 can be manufactured. In this developing roll, the thickness of each layer is appropriately determined, but the thickness of the innermost layer is preferably set in the range of 2 to 10 mm, and particularly preferably 3 to 6 mm. The thickness of the intermediate layer is preferably set in the range of 3 to 90 μm, and particularly preferably 5 to 15 μm. The thickness of the outermost layer is preferably from 20 to 100 μm, particularly preferably from 30 to 70 μm.

In this way, a developing roll having an outermost layer formed using the rubber composition of the present invention can be produced, but the present invention is not limited to this. That is, the rubber composition of the present invention is capable of imparting excellent toner releasability to the roll surface for a long period of time. Applicable. Examples of such a roll include a fixing roll.

[0068]

As described above, the rubber composition of the present invention
A rubber composition in which particles formed from a reactive silicone oil or the like are dispersed in a fluororubber matrix,
The particle size distribution of the particles is 90% and the cumulative sectional area particle size is 8 to 30.
μm, and the particles are reactively fixed in the fluororubber matrix. For this reason, generation of large aggregates of silicone oil, which is a toner release agent, and exudation to the roll surface, which have been problems in the outermost layer of the conventional developing roll, can be prevented. As a result, for example, in a developing roll in which the outermost layer is formed using the rubber composition of the present invention, occurrence of toner filming is prevented, and a high-quality copied image can be obtained for a long period of time .

Next, examples will be described together with comparative examples.

First, prior to Examples and Comparative Examples, a core metal (diameter: 10 mm, made of SUS304) serving as a shaft, a material obtained by adding carbon black to liquid silicone rubber as a material for forming the innermost layer, and a material for forming an intermediate layer were prepared. What prepared carbon black added to hydrogenated nitrile rubber was prepared.

Then, an innermost layer and an intermediate layer were formed on the outer periphery of the shaft body according to the above-mentioned method, and a roll base was produced.

[0072]

Examples 1 to 4 and Comparative Examples 1 to 4 An outermost layer was formed on the outer peripheral surface of the roll base by the above-mentioned second method. That is, the materials shown in the following Tables 1 and 2 were blended in the proportions shown in the same table, and a fluororubber composition was prepared according to the above-mentioned second method. Using this fluororubber composition, an outermost layer was formed on the outer peripheral surface of the roll substrate by the above-described method (coating method: roll coating method) to produce a target developing roll. The thickness of the innermost layer of this developing roll is 5 mm, the thickness of the intermediate layer is 10 μm, and the thickness of the outermost layer is 50 μm.

With respect to the developing rolls of Examples 1 to 4 and Comparative Examples 1 to 4 obtained as described above, evaluation of copied images and occurrence of toner filming were examined by the following methods. The results are also shown in Tables 1 and 2 below. In the same table, the average particle diameter and the 90% cumulative sectional area particle diameter of the particles are also shown. The measurement of the 90% cumulative sectional area particle size was performed by the method described below.

[Evaluation of Copy Image] The developing roll was incorporated in an electrophotographic copying machine, and copying was actually performed. Then, the image quality of the copied image was visually evaluated at the beginning of copying and after copying 30,000 sheets. That is, print the characters,
A sample having no problem in the copied image and having fine lines copied clearly was marked with "O", and a sample with blurring or fogging was rated as "x". Note that blurring refers to a thing in which a thin line is interrupted, and fogging refers to a thing in which toner has flown to a place where there is no image. When toner filming occurred, evaluation was made separately for a portion where toner filming occurred and a portion where toner filming did not occur.

[Toner Filming] The portion where the toner is thickly adhered to the surface of the developing roll has poor chargeability and causes a defect in a copied image. Specifically, if a part of the toner component adheres to the surface of the developing roll with a thickness of 1 μm or more, the image is significantly deteriorated. Therefore, the toner adhesion is 1
When the thickness was more than μm, it was determined that toner filming occurred.

[90% Cumulative Cross-sectional Area Particle Size] As shown in FIG. 5A, two cuts are made at right angles to the axial direction in the elastic portion (the innermost layer, the intermediate layer, and the outermost layer) of the developing roll 20. Then, the sample was cut into pieces and cut in the axial direction, taken out from the metal core, and a sample 20a as shown in FIG. Then, sample 2 in FIG.
As shown in the cross-sectional view of FIG. 0a, the scanning electron microscope (S-4100,
(Manufactured by Horiba, Ltd.). Then, the 90% cumulative cross-sectional area particle size was automatically obtained by using the image processor (Spica II, manufactured by Nippon Avionics) according to the procedure described above.

[0077]

[Table 1]

[0078]

[Table 2]

From Table 1 above, the particles of the reactive silicone oil and the like have a 90% cumulative sectional area particle size of 8 to 30 μm.
The developing rolls of Examples 1 to 4 have no problem in the copied image,
The fine lines were also clearly copied, and no toner filming occurred. On the other hand, from Table 2 above, it is found that the 90% cumulative cross-sectional area particle size of the particles of
In the developing rolls of Comparative Examples 1 to 4 exceeding 0 μm, toner filming occurred, and in this portion, the copied image was poor.

The results of observation with an electron microscope and Table 1
Judging from the results (toner filming) shown in Table 2, the 90% cumulative cross-sectional area of the particles formed from the reactive silicone oil or the like dispersed in the fluororubber matrix in the example product was determined. Since the particle diameter is 8 to 30 μm and the particles are reactively fixed in the fluororubber matrix, it can be said that toner filming was prevented from occurring in the developing roll of the example.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a microscopic structure of a rubber composition of the present invention.

FIG. 2 is a cross-sectional view illustrating a structure of a developing roll.

FIG. 3 is a cross-sectional view illustrating a method of manufacturing a developing roll.

FIG. 4 is a graph showing the relationship between the particle size of the particles and the cumulative cross-sectional area ratio of the particles.

FIG. 5A is a perspective view showing a state in which the developing roll is cut, FIG. 5B is a perspective view of a sample cut from the developing roll, and FIG. 5C is a cross-sectional view of the sample. .

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI C08L 51/06 C08L 51/06 F16C 13/00 F16C 13/00 B G03G 15/08 501 G03G 15/08 501D // C08G 81 / 00C08G 81/00 (72) Inventor Akihiko Kaji Komaki City, Aichi Prefecture, Ogai Kitagaiyama, Gezu 3600 Tokai Rubber Industries Co., Ltd. (56) References JP-A-3-285934 (JP, A) JP-A-3 JP-A-284780 (JP, A) JP-A-5-140402 (JP, A) JP-A-4-359950 (JP, A) JP-A-4-180932 (JP, A) JP-A-5-202926 (JP, A) JP-A-8-12733 (JP, A) JP-A-62-112647 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08F 299/00 C08F 8/00 C08F 259 / 08 C08L 27/12 C08L 51/04 C08L 51/06 F16C 13/00 G03G 15/08 501 C08G 81/00

Claims (5)

(57) [Claims] 1. A rubber composition comprising a fluororubber as a matrix component and particles formed from a release agent dispersed in the fluororubber matrix, wherein the release agent comprises the following (a) and (b): ), The particles formed from the release agent are fixed in the fluororubber matrix by reaction, and the cross-sectional area of the particles having a particle size of 0.1 μm or more is measured. A rubber composition characterized in that the particles having a cumulative cross-sectional area of 90% of the total cumulative cross-sectional area when accumulated have a particle size of 8 to 30 μm. (A) Reactive silicone oil or reactive fluorine oil. (B) Non-reactive silicone oil or non-reactive fluorine oil [however, the same type as (a) is used]. 2. The reactive silicone oil has at least one reactive group selected from the group consisting of a hydroxyl group, an amino group, a mercapto group, an epoxy group, a carboxyl group, and a methacryl group,
The rubber composition according to claim 1, wherein the reactive fluorine oil is a reactive fluorine oil having at least one reactive group selected from the group consisting of a hydroxyl group, an amino group, a mercapto group, an epoxy group, a carboxyl group, and a methacryl group. object. 3. The rubber composition according to claim 1, wherein the average molecular weight of the reactive silicone oil is 300 to 150,000, and the average molecular weight of the reactive fluorine oil is 200 to 20,000. 4. The total blending ratio of said reactive silicone oil and said reactive fluorine oil is 10% or less.
The amount is 0.5 to 100 parts by weight with respect to 0 parts by weight.
The rubber composition according to any one of claims 1 to 3. 5. The rubber composition according to claim 4, wherein the non-reactive silicone oil has a higher alcohol ester group, and the non-reactive fluorine oil is perfluoropolyether.