JPH03100059A - Addition reaction-type silicone rubber composition, and molding, elastic rotating body and fixing apparatus formed from same composition - Google Patents

Abstract

PURPOSE:To obtain the tile composition which can give a rubber molding prevented from or reduced in the buildup of static electricity by mixing an organopolysiloxane with an organohydrogenpolysiloxane, specified fine hollow spherical porous inorganic particles and a platinum compound. CONSTITUTION:100 pts.wt. fine hollow spherical porous inorganic particles which are hollow microspheres of a particle diameter of 1-200mum and have pores of a diameter of 10-400Angstrom in their crusts are impregnated with 50-600 pts.wt. liquid substance which can prevent or reduce the buildup of static electricity to obtain a product (A). 100 pts.wt. organopolysiloxane (B) having at least two Si-bonded unsaturated groups in the molecule is mixed with an organohydrogenpolysiloxane (C) having at last three Si-bonded H atoms in the molecule in an amount to give a ratio of the number of moles of the Si- bonded H atoms in component (C) to that of the unsaturated groups in component B of 0.5-20/1, 0.1-40 pts.wt. component C, 0.1-500ppm of a platinum compound (D) and optionally a filler (E).

Description

Detailed Description of the Invention [Industrial Application Field] The present invention comprises a silicone rubber composition, a molded article formed from the composition, and an elastic body having a surface layer formed from the composition. The present invention relates to an elastic rotating body and a fixing device having the elastic rotating body.

[Conventional technology]

2. Description of the Related Art In image forming apparatuses such as electronic copying machines, a conveyance roller that conveys a sheet-like transfer material or recording material such as plain paper along a predetermined path is generally required to have good conveyance performance, releasability, and durability.

In particular, fixing rollers and heat rollers that must apply heat under pressure to the unfixed toner image on the transfer paper and convey the transfer paper to a predetermined path while preventing the offset phenomenon of semi-melted or molten toner. A fixing device equipped with a pressure roller is required to have conveyance properties, release properties, abrasion resistance, fixing properties, and durability under more severe conditions.

Conventionally, this type of fixing device has at least a fixing roller and a pressure roller that is in pressure contact with the fixing roller and rotates as a result of the fixing roller. The fixing roller is made of aluminum, for example.

Polytetrafluoroethylene is placed on a hollow core made of iron, etc.
A layer of a material with good mold releasability such as a fluororesin such as a tetrafluoroethylene-fluoroalkoxyethylene copolymer or a silicone rubber is formed as a coating. Also,
The fixing roller is provided with a heater such as a halogen lamp, if necessary, to raise the temperature of the surface of the fixing roller to a specific temperature suitable for fixing. In addition, in the case of multiplexing, the surface temperature of the fixing roller is controlled using a sensor so that it always remains at a set temperature.Furthermore,
The outer peripheral surface of the fixing roller may be provided with a cleaner for removing offset toner and paper dust, and a separation claw for preventing the image bearing material from being wrapped around the fixing roller.

On the other hand, in the pressure roller, a core metal such as iron or stainless steel is coated with an elastic layer having release properties such as silicone rubber. The pressure roller is pressed against the fixing roller by a spring or the like.

In this way, the image bearing material having the unfixed toner image is held and conveyed under heat and pressure by the fixing roller and the pressure roller, whereby the unfixed toner image is fixed under pressure.

[Problem to be solved by the invention]

In the above-mentioned conventional apparatus, there was a problem in that the pressure roller was charged to, for example, 2 KV or more due to frictional electrification when paper was passed through the paper, and as a result, the paper wound around the pressure roller. Further, due to the electric field of the pressure roller, unfixed toner scatters and blurs the line image, and toner adheres to the surface of the fixing roller, resulting in increased offset.

As a countermeasure to the above-mentioned problem, conventionally, a static elimination brush was brought into contact with the pressure roller to eliminate static electricity by grounding. However, even with this measure, the potential drops only to about 1 to 2 KV, and the static elimination effect is limited and cannot be said to be sufficient, and an improvement has been desired.

In addition, in the case of a fixing device that does not have a cleaning means for cleaning the surface of the fixing roller, if the surface of the pressure roller is highly charged, the amount of toner adhering to the surface of the fixing roller increases, and the toner is transferred to a transfer material such as paper. Alternatively, since the toner is transferred to the pressure roller surface, problems such as image defects such as offset and toner adhesion stains on the roller surface are likely to occur.

[Means and effects for solving the problems] The present invention provides addition-reactive silicone inorganic hollow spherical porous fine particles (inorganic microcapsules having a porous inorganic wall) containing and carrying a liquid substance capable of preventing or suppressing electrification. By incorporating it into a rubber composition, it is possible to prevent or suppress charging of a rubber molded article.

A polyester material constituting the silicone rubber composition of the present invention,
R1+R2 is an alkyl group such as a methyl group or an ethyl group, an aryl group such as a phenyl group, or a polyfluoroalkyl group such as a trifluoropropyl group.

The present invention comprises: (A) 100 parts by weight of an organopolysiloxane having at least two silicon-bonded unsaturated groups in one molecule; (B)
78 parts by weight of an organohydrodiene polysiloxane having at least 3 silicon-bonded hydrogen atoms in one molecule [However, 8 parts by weight is the total amount of silicon-bonded hydrogen atoms in the organohydrodiene polysiloxane and (A) The amount is such that the number of moles of all unsaturated groups in the components is from 0.5/1 to 20/1], (C) an inorganic hollow spherical porous material containing and supporting a liquid substance that can prevent or suppress electrification. This is a silicone rubber composition containing 0.1 to 40 parts by weight of fine particles and 0.1 to 500 ppm of (D) a platinum-based compound.

The organopolysiloxane (A) component used in the present invention is the main component of the composition of the present invention, and is cured by addition reaction with the (B) component by the catalytic action of the (D) component. (A)
The component is an organopolysiloxane having at least two silicon-bonded unsaturated groups in one molecule, such unsaturated groups being exemplified by vinyl, allyl, and propenyl groups. The unsaturated group may be present anywhere in the component, but is preferably present at least at the terminal of the molecule.

Furthermore, the molecular structure of this component is linear, linear with branches,
It may be either ring-shaped or mesh-shaped. The molecular weight of this component is not particularly limited (it can range from a low viscosity liquid to a very high viscosity raw rubber, but the viscosity at 25°C must be 100 centipoise for the cured product to become a rubber-like elastic body). The above is preferable.Such organopolysiloxanes include methylvinylpolysiloxane, copolymers of methylvinylsiloxane and dimethylsiloxane,
Dimethylpolysiloxane with dimethylvinylsiloxane groups blocked at both ends, dimethylsiloxane-methylphenylsiloxane copolymer with dimethylvinylsiloxane groups blocked at both ends, dimethylsiloxane-diphenylsiloxane-methylvinylsiloxane copolymer with dimethylvinylsiloxane groups blocked at both ends , dimethylsiloxane-methylvinylsiloxane copolymer with both ends blocked by trimethylsiloxy groups,
Dimethylsiloxane-methylphenylsiloxane-methylvinylsiloxy copolymer with trimethylsiloxy groups blocked at both ends, methyl(3,3,3-1-lifluoropropyl)polysiloxane blocked with dimethylvinylsiloxane groups at both ends, dimethylvinyl at both ends Siloxy-blocked dimethylsiloxane-methyl (3,3°3-trifluoropropyl)
Siloxane copolymer, CH2=CH(CH2)25i0
272 units and (CH2)2S i O2/2 units and S
i0. A polysiloxane consisting of /2 units is exemplified. In the present invention, the above organopolysiloxanes may be used in combination.

The organohydrodiene polysiloxane of component (B) is a crosslinking agent of component (A), and the silicon-bonded hydrogen atom of this component undergoes an addition reaction with the unsaturated group in component (A) due to the catalytic action of component (D). It hardens. This (B)
The component has at least three silicon-bonded hydrogen atoms in one molecule. The molecular structure of this component is not particularly limited.

The molecular weight of this component is also not particularly limited, but in order to have good compatibility with component (A), the viscosity at 25°C is 1 to 50.00.
Preferably it is 0 centipoise.

The amount of this component added is such that the molar ratio between the total amount of silicon-bonded hydrogen atoms in this component and the total amount of all unsaturated groups in component (A) is 0.5/l to 20/1. A large amount is required. When the molar ratio is smaller than 0.5/1, good curability is obtained, especially when the molar ratio is larger than <<20/1, the hardness tends to increase when the cured product is heated. Preferably, the molar ratio is 0.5/1 to 5/1.

The organohydrodiene polysiloxane of this component is methylhydrodienepolysiloxane with both terminals blocked by trimethylsiloxy groups, dimethylsiloxane-methylhydrodienesiloxane copolymer with both terminals blocked with trimethylsiloxy groups, and dimethyl with both terminals blocked with dimethylhydrogensiloxy groups. Siloxane-methylhydrodienesiloxane copolymer, dimethylsiloxane-methylhydrodienesiloxane cyclic copolymer, (CH3) 2 H3iO+
Copolymer consisting of /2 units and S i O2/4 units, (
CH3) 3 SiO+/2 units (CH3)2 H3i
A copolymer consisting of O+/2 units and S i 04/2 units is exemplified.

In the inorganic hollow spherical porous fine particles containing and carrying a liquid substance capable of preventing or suppressing the charging of the component (C), the liquid substance capable of preventing or suppressing the charging is heat resistant, such as a fluorine-based surfactant. , a silicone polyether copolymer having a polyoxyalkylene group in its side chain.

Examples of fluorine-based surfactants include perfluoroalkyl esters, perfluoroalkyl polyoxyethylene ethanol, perfluoroalkyl carboxylates, perfluoroalkyl ammonium salts, perfluoroalkyl betaines, perfluoroalkyl amine oxides, and perfluoroalkyl ethylene oxide additions. Examples include perfluoroalkyl phosphates, perfluoroalkyl phosphates, and non-dissociable perfluoroalkyl compounds. In particular, perfluoroethylene oxide adducts are preferred because they have little curing inhibition and are excellent in static elimination effects.

Silicone polyether copolymers with polyoxyalkylene groups in their side chains have a nonionic surfactant structure in which the dimethylpolysiloxane portion of the molecule is a hydrophobic group and the polyether portion is a hydrophilic group. , general formula % formula % (m≠0, n≠0, at least one of a and b is a positive integer) The inorganic hollow spherical porous fine particles have a particle size of 1 to 20.
Hollow microspheres with a diameter of 0 μm and pores with a diameter of 10 to 400 in the spherical shell. Inorganic hollow spherical porous fine particles are patented No. 1.
It was obtained by the interfacial reaction method described in No. 184016 (1983). The spherical shell (wall) of the hollow microspheres is preferably made of inorganic compounds such as silica (SiO2), calcium silicate, and strontium silicate, since these are strong against breakage. The liquid substance having the effect of preventing or suppressing charging of the inorganic hollow spherical porous fine particles is supported as follows. A predetermined amount of inorganic hollow spherical porous fine particles is placed in a flask inside a glass bell as shown in Figure 1, and the vacuum is evacuated at 10-''torr for 3 to 4 hours.While maintaining the vacuum state, the length of the legs set in advance is A predetermined amount of a liquid substance that prevents or suppresses electrostatic buildup is dripped or injected from a liquid funnel.

After injecting the entire amount and leaving it for one hour, the inside of the glass bell is returned to atmospheric pressure to obtain inorganic hollow spherical porous fine particles containing a liquid substance that has the desired effect of preventing or suppressing electrification. The impregnation ratio of the liquid substance having antistatic ability to the fine powder is from 50 parts by weight to 600 parts by weight per 100 parts by weight of the fine powder.
This is the heaviest range.

The amount of the inorganic hollow spherical porous fine particles containing and supporting a liquid substance capable of preventing or suppressing electrification added to the silicone rubber composition is in the range of 0.1 to 30% by weight, preferably 0.1 to 10% by weight. . The amount is 0.1 to 40 parts by weight per 100 parts by weight of component (A).

(D) A catalyst that carries out an addition reaction between the silicon-bonded atom and the unsaturated group, such as chloroplatinic acid, a solution of it in alcohol or ketones, and an aged solution of chloroplatinic acid. complex compounds, platinum black, and those in which platinum is supported on a carrier.

The amount of this component added is the total of component (A) and component (B) [1
0.1 to 1100 as platinum-based metal per 00 parts by weight
This is because the crosslinking reaction does not proceed sufficiently when the amount is less than 0.1 to 11,000 pp, and it is uneconomical when it exceeds 11,000 pp. When normally used, the amount of platinum-based metal added is preferably about 1 to 1100 pp.

The silicone rubber composition of the present invention includes fine powder synthetic silica, quartz powder, fused quartz powder, diatomaceous earth,
Calcium carbonate or the like may be added. As other additives, heat resistance improvers such as iron oxide such as red iron oxide, compression set improvers such as titanium oxide and zinc oxide, and dispersants such as low molecular weight siloxane may be used.

The elastic rotating body of the present invention includes an elastic body formed from a silicone rubber composition containing inorganic hollow spherical porous fine particles that contain and support a liquid substance that can prevent or suppress electrification. The fixing device of the present invention fixes an unfixed toner image formed on the image carrier by heating and pressing the image carrier by sandwiching and conveying the image carrier between at least a pair of rollers.

Embodiments of the elastic rotating body and fixing device of the present invention will be described below based on the accompanying drawings.

FIG. 2 is a diagram mainly showing a vertical cross-sectional view showing a schematic configuration of a fixing device including the elastic rotating body of the present invention as a pressure roller. In the figure, reference numeral 1 denotes a fixing roller, and the fixing roller l has a heat-resistant and mold-releasing resin layer 3 made of PFA, PTFE, etc. formed on the outer surface of a core metal 2 made of aluminum, iron, stainless steel, etc. There is.

A heating means 9 such as a heater is included inside the core metal 2.

A pressure roller 4 is pressed against the fixing roller l by a spring or the like (not shown) and rotates as a result. The pressure roller 4 has an elastic layer 6 made of a silicone rubber composition according to the present invention formed on a core metal 5 made of iron, stainless steel, or the like.

Around the fixing roller 1, there is a thermistor 8 for detecting the temperature of the fixing roller 1. A cleaner may be provided for contacting the fixing roller l and cleaning its surface (and a cleaner for guiding the transfer material 11 such as plain paper having the toner image 10 between the fixing roller l and the pressure roller 4). An entrance guide 12 and the like are provided.On the other hand, a conductive leaf spring 13 for grounding is in contact with the core metal 5 of the pressure roller 4.

〔Example〕

Hereinafter, parts mean parts by weight.

[Example 1] 100 parts of vinyl group-containing diorganopolysiloxane.

100 parts of an addition-reactive liquid silicone rubber composition with a viscosity of 900 poise, consisting of 5 parts of dry finely powdered silica, 20 parts of quartz powder, 1 part of red iron and a platinum catalyst, are mixed with a fluorine-based surfactant (Mitsubishi Metals F-Top EF122B). ) Addition reaction type liquid silicone rubber composition obtained by adding one part of supported silica hollow spherical porous fine particles and uniformly stirring and dispersing the mixture was designated as Solution A.

100 parts of a mixture of a vinyl group-containing diorganopolysiloxane and an active hydrogen group-containing diorganopolysiloxane in an amount such that the ratio of the number of moles of silicon-bonded hydrogen atoms to the number of moles of silicon-bonded vinyl groups is 2/1, dry fine powder Similar to Solution A, 10 parts of silica hollow spherical porous fine particles supporting a fluorosurfactant were added to 100 parts of an addition reaction type liquid silicone rubber composition with a viscosity of 600 voids consisting of 5 parts of silica, 20 parts of quartz powder, and 1 part of red iron. The addition reaction type liquid silicone rubber composition obtained by uniformly stirring and dispersing the mixture was designated as Liquid B.

After mixing liquid A and liquid B at a weight ratio of 100:100 and defoaming,
By heating at 150° C. for 10 minutes, the vinyl groups in the mixed composition and silicon-bonded hydrogen start an addition reaction in the presence of a platinum catalyst, and the mixed composition is cured to form a rubber-like elastomer. became.

Silica hollow spherical porous fine particles containing and supporting a fluorosurfactant were prepared as follows.

Average particle size 20μm, mode pore diameter distribution range 20-100
Silica (S) with a specific surface area of 200 to 600 rrr/g
in2) 100 g of hollow spherical porous fine particles were placed in the flask inside the glass bell shown in Figure 1 and evacuated for 4 hours at 10-''torr. 100 cc of a fluorine-based surfactant manufactured by Mitsubishi Metals F-Top@EF122B (N-polyoxyethylene-N-alkyl-perfluorooctane sulfonic acid amide) was dropped and injected.After injecting the entire amount, it was left to stand for 1 hour. , return the inside of the glass bell to atmospheric pressure,
A liquid substance with the desired antistatic ability (EFTOP EF
Inorganic hollow spherical porous fine particles containing and supporting 122B) were obtained.

[Comparative Example 1] Addition reaction type liquid silicone rubber with a viscosity of 900 voids was used in Liquid A of Example 1, except that no hollow spherical porous particles of silica containing a fluorine-based surfactant were added. A composition was prepared and designated as Solution C.

In addition, in the B liquid of Example 1, an addition reaction type liquid silicone rubber composition with a viscosity of 600 poise was added as in the B liquid, except that the silica hollow spherical porous fine particles containing and supporting a fluorine-based surfactant were not added at all. This was prepared as Solution D.

Mix liquid C and liquid D uniformly at a weight ratio of 100:100,
After defoaming, by heating at 150°C for 10 minutes,
The vinyl groups and silicon-bonded hydrogen in the mixed composition started an addition reaction in the presence of a platinum catalyst, and the mixed composition was cured into a rubber-like elastic body.

[Comparative Example 2] 6 parts of a porous inorganic fine powder having micropores supporting a fluorine-based surfactant was added to the A liquid of Example 1 to produce an addition reaction liquid silicone rubber with a viscosity of 600 voids like the A liquid. A composition was prepared and used as liquid E.

In the B solution of Example 1, 6 parts of porous inorganic fine powder having micropores supporting a fluorosurfactant was added to prepare an addition reaction liquid silicone rubber composition having a viscosity of 900 voices in the same manner as B solution. It was used as F solution. The weight ratio of E liquid and F liquid is 1
After uniformly mixing 00:100 and defoaming, heating at 150 ° C. for 10 minutes causes the vinyl groups and silicon-bonded hydrogen in the mixed composition to start an addition reaction in the presence of a platinum catalyst, The mixed composition was cured into a rubber-like elastomer.

The above fluorosurfactant-impregnated porous inorganic filler was prepared as follows. Average particle size 25μm, pore size approximately 0.01
~10μm, oil absorption 500mf/100g.

Apparent specific gravity OJ, BET specific surface area 115rr? /g of gyrolite type calcium silicate (Fluorite ■R manufactured by Tokuyama Soda) was introduced into a stirring device, and perfluoroethylene oxide adduct (N-polyoxyethylene-
500 parts by weight of a fluorine-based surfactant consisting of N-alkyl-perfluorooctane sulfonic acid amide was gradually added dropwise to the calcium silicate fine powder while stirring, until the total f.
i (500 parts by weight) After dropping, remove from the stirring device,
A calcium silicate fine powder impregnated with a surfactant was prepared by air drying at 50° C. for 1 hour.

[Comparative Example 3] Adding 10 parts of a fluorine-based surfactant (Mitsubishi Metals' F-Top EF122B) to the B solution of Example 1 to prepare an addition reaction liquid silicone rubber composition having a viscosity of 900 poise like the B solution. It was made into liquid G.

After uniformly mixing liquid A and liquid G at a weight ratio of 100:100 and defoaming, the mixed composition was heated at 150° C. for 10 minutes, but the mixed composition was not completely cured.

Example 1. Comparative example 1. Regarding the rubber-like elastic body obtained in Comparative Example 2, the antistatic and static eliminating effects were investigated by the following methods. 20mm x 60mm x 2m
After applying 15,000 V for a predetermined period of time (1 second) to the rubber test piece of 50 m by corona discharge, the change in potential on the surface of the rubber test piece was immediately measured using a sensitive plate probe with a surface electrometer. The results are shown in FIG.

[Example 2] A pressure roller for a heat-pressure fixing device having the silicone rubber composition of the present invention as an elastic layer was manufactured as follows.

Liquid A of the silicone rubber composition of Example 1 was placed in a cylindrical mold in which a siloxane-based primer-coated pressure roller core bar made of stainless steel with an outer diameter of 10 mm was preheated to 130°C. : B liquid was uniformly mixed at a weight ratio of 100:100, and the resulting mixed liquid was injected by defoaming and held at the same temperature for 10 minutes to harden. The silicone rubber-coated pressure roller taken out from the mold after curing had an outer diameter of 16 mm and a silicone rubber coating layer thickness of 3 mm.

A heat fixing type fixing device shown in FIG. 2 was installed using the pressure roller obtained above, and a continuous sheet feeding fixing process test was conducted under the following conditions. The fixing roller 1 used was one in which an aluminum core metal having an outer diameter of 20 mm was coated with tetrafluoroethylene resin in a layer thickness of 15 μm.

(Fixing conditions) Fixing roller surface control temperature: 150°C Tightening pressure between fixing roller and pressure roller: 6 kgf Paper passing: A4 size transfer paper (plain paper) on which the unfixed toner image of the test pattern was formed Paper passing speed : 4 sheets/min As a result, even after 250,000 sheets were passed, no toner adhesion stains occurred on the pressure roller surface, and no toner adhesion to the fixing roller surface. In addition, there were no poor image quality, no image stains, and no missing images, and good image quality and fixing performance were maintained.In particular, there was no paper jam due to paper wrapping around the roller.

No paper curls or wrinkles occurred, and good conveyance was maintained without any jam troubles. Changes in the shape of the roller were also extremely small, and the dimensional stability was also good.

[Comparative Example 4] A pressure roller was manufactured in the same manner as in Example 2, except that liquid G and liquid D prepared in Comparative Example 1 were used.

As a result, after 10,000 sheets were passed, toner adhesion and stains on the pressure roller surface increased, resulting in poor image quality, 1 image was stained, and 1 image was missing.

Paper wrinkles, paper jams, and one paper curl occurred.

[Comparative Example 5] A pressure roller was manufactured in the same manner as in Example 2 except that the F liquid and the F liquid prepared in Comparative Example 2 were used.

As a result, after 150,000 sheets were passed, toner adhesion to the pressure roller surface increased, image quality was poor, 2 image stains, 9 missing images, 9 paper wrinkles,
Paper jams, 9 paper curls, etc. occurred.

〔Effect of the invention〕

The present invention provides the following effects by incorporating and carrying a liquid substance capable of preventing or suppressing electrification on inorganic hollow spherical porous fine particles and incorporating the fine particles into an addition reaction type silicone rubber composition.

1. Decrease in curability caused by directly adding and mixing a liquid substance with antistatic ability.

Deterioration of physical properties such as strength 9 elasticity and other performance can be prevented.

2) Powdering the liquid substance by supporting the liquid substance in inorganic hollow spherical porous particles facilitates dispersion into the silicone rubber composition and enables uniform dispersion.

3. By incorporating inorganic hollow spherical porous fine particles containing and supporting a liquid substance capable of preventing or suppressing electrification into a silicone rubber composition, it is possible to prevent or suppress electrification of a rubber molded article.

4. The inorganic hollow spherical porous fine particles containing and carrying a liquid substance with antistatic ability are uniformly dispersed in the silicone rubber, so the antistatic ability of the rubber molded product is improved compared to when an antistatic agent is directly added. improves.

5. The liquid substance with antistatic ability contained in the inorganic hollow spherical porous fine particles is gradually released from the fine particles and transferred to the surface of the rubber molded product (this dramatically improves the sustainability of the effect). .

Further, when the composition of the present invention is used as an elastic surface layer of a fixing roller of an image fixing device in an image forming apparatus such as an electronic copying machine and a fixing roller such as a pressure roller,
Since charging on the roller surface can be prevented or suppressed, the amount of toner adhering to the roller surface is significantly reduced, making it possible to prevent image defects such as offset and contamination due to toner adhesion to the roller surface, as well as to reduce the amount of toner adhering to the roller surface. Conveyance problems such as wrapping and paper curling are also solved. In addition, by gradually supplying the liquid substance with antistatic ability contained in the inorganic hollow spherical porous fine particles into the silicone rubber, good antistatic effect and neutralizing effect are maintained over a long period of time, and as a result, Conveyance problems such as contamination due to toner adhesion to the roller surface, paper wrapping around the roller, and paper curling can be prevented for a long time, making it possible to dramatically improve the durability of the roller.

Note that the silicone rubber composition of the present invention may be used as a covering material for both the fixing roller and the pressure roller among the fixing rollers, or either the fixing roller or the pressure roller may be used.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an apparatus for impregnating inorganic hollow spherical porous particles with a liquid substance having antistatic ability. FIG. 2 shows a longitudinal sectional view of an apparatus according to an embodiment of the present invention. FIG. 3 shows an example of the change over time in the surface potential of the silicone rubber surface. DESCRIPTION OF SYMBOLS 1... Fixing roller 2... Pressure roller 6... Elastic layer 7... Inorganic hollow spherical porous fine particles containing and carrying the liquid substance having antistatic ability of the present invention 10... Not fixed Toner 11...transfer paper

Claims (4)

[Claims] (1) (A) 100 parts by weight of an organopolysiloxane having at least two silicon-bonded unsaturated groups in one molecule; (B) an organohydrodiene polysiloxane having at least three silicon-bonded hydrogen atoms in one molecule; Part by weight [However, Part by weight is the total amount of silicon-bonded hydrogen atoms in the organohydrodiene polysiloxane and (A)
The molar ratio of all unsaturated groups in the components is from 0.5/1 to 20/1
(C) 0.1 to 40 parts by weight of inorganic hollow spherical porous fine particles containing and supporting a liquid substance capable of preventing or suppressing electrification; and (D) 0.1 to 40 parts by weight of a platinum-based compound. An addition reaction type silicone rubber composition, characterized in that it contains 500 ppm. (2) A molded article formed from the addition reaction type silicone rubber composition according to claim 1. (3) An elastic rotating body comprising an elastic body having a surface layer formed from the addition reaction type silicone rubber composition according to claim 1. (4) In a fixing device that heats and presses an unfixed toner image formed on an image bearing material by conveying the image bearing material between at least a pair of rollers, the surface layer of at least one of the rollers is made of an elastic material. A fixing device characterized in that the elastic body is formed from the addition reaction type silicone rubber composition according to claim 1.