JP2001235954A - Electrophotographic fixing member and fixing device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrophotographic fixing member having excellent release property for toner and excellent mechanical strength and durability, with which an image of high picture quality can be obtained, and to provide a fixing device using that member. SOLUTION: In the electrophotographic fixing member having at least a surface layer on a substrate, the surface layer contains a vulcanized rubber composition prepared by compounding 3 to 70 pts.wt. of low mol.wt. ethylene tetrafluoride resin fine particles having 0.01 to 10.0 μm volume average particle size to 100 pts.wt. of fluorine rubber. The fixing device has a pair of fixing rolls consisting of a heating roll 1 and a pressurizing roll 2 which pressurizes the heating roll 1. In the device, a recording material 3 which supports an unfixed toner image 4 is passed through the nip region formed by the pair of fixing rolls so as to fix the image by heat and pressure. In the device, at least one of the heating roll 1 and pressurizing roll 2 is the aforementioned electrophotographic fixing member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing member for electrophotography using a rubber composition having excellent non-adhesiveness, water repellency, and oil repellency to toner and the like, and particularly to a fixing roll. Also,
The present invention relates to a fixing device that fuses a toner image by simultaneously applying heat and pressure to a recording material that supports a powder toner image.

[0002]

2. Description of the Related Art Conventionally, in a copying machine or the like utilizing an electrophotographic process, it is necessary to fix an unfixed toner image formed on a recording sheet into a permanent image. A pressure fixing method and a heat fixing method are known. The solvent fixing method has a drawback that solvent vapor emanates and causes many odors and hygiene problems.On the other hand, the pressure fixing method also has a drawback that the fixability is poor as compared with other fixing methods. At present, none of them are widely used. Therefore, for fixing an unfixed toner image, a heat fixing method in which the toner is generally melted by heating and fused on a recording sheet is widely used.

Conventionally, as a heat fixing device used in the heat fixing method, a heating roller having a heater lamp inside a cylindrical core metal and having a heat-resistant release layer formed on the outer peripheral surface thereof, And a pressure roll having a heat-resistant elastic layer formed on the outer peripheral surface of a cylindrical cored bar, and between these two rolls, 1 to 15 kg / cm ² , preferably 3
A heat-fixing roll type is known in which a pressure of 10 kg / cm ^{2 to} 10 kg is applied, and a recording material such as plain paper having an unfixed toner image formed thereon is inserted and fixed. The heat roll type fixing device used in this method has higher thermal efficiency than other heat fixing methods such as hot air fixing method and oven fixing method, so it has low power, high speed, and paper jam. It is currently the most widely used due to its low fire risk.

[0004] The fixing roll of the heating roll type fixing device used in the above-mentioned heating fixing roll system is mainly divided into two types depending on the roll material used. That is, after applying an adhesive called a primer on a core metal roll of aluminum, iron, or the like, polytetrafluoroethylene (PT
FE) or a fluororesin-coated roll thinly coated with a fluororesin, such as a copolymer of tetrafluoroethylene and perfluoroalkoxyethylene (PFA), and a silicone rubber or a fluororubber on a metal core roll via a primer. Rolls coated with silicone rubber or rolls coated with fluorine rubber which are coated thinly. The former is called a hard roll because it is relatively hard, and the latter is called a soft roll because it is soft and elastic.

The former is mainly used in black-and-white copiers and printers, and the latter is mainly used in color copiers and printers, high-quality black-and-white copiers and the like. In particular, when forming a color image, high image quality and releasability are required, and a rubber roll having elasticity is excellent in uniformly fixing a toner image. Rolls are employed.

[0006] Among these soft rolls, the silicone rubber-coated roll contains a silicone oil called free oil inside the material, and these have a great influence on the releasability. And high releasability. Of the silicone rubbers, those of the room temperature vulcanization type called RTV type contain a lot of this free oil and are therefore considered to be materials having good releasability. However, on the other hand, the presence of the free oil causes problems such as a decrease in rubber strength and a reduction in the outer shape of the roll due to release of the free oil. Therefore, the silicone rubber-coated roll is used when the roll life may be relatively short.

On the other hand, fluororubber is very durable, has high abrasion resistance, and has elasticity, so that it is excellent in high image quality. However, since the fluororubber itself has a property of repelling polydimethylsiloxane oil (silicone oil) which is generally used as a release agent oil, it is difficult to form an oil release layer between the fluororubber and the toner image. . Therefore, when used in combination with polydimethylsiloxane oil (silicone oil), the releasability of a low-melting-point, high-color-forming toner such as a color toner is poor, and it cannot be used. In order to improve this point, a part of polydimethylsiloxane oil is replaced with a mercapto group: -S
H ₂ or amino group: -NH ₂ may use the substituted modified silicone oil has been proposed.

In this case, the above functional group reacts with a metal oxide (MgO, PbO, etc.) or a double bond contained in the fluororubber to form a molecular film of silicone oil on the roll surface, This serves as a release layer and is modified into a highly releasable surface (JP-A-59-4699 and JP-A-4-230784). However, since the high release surface-modifying silicone oil also releases the copy sheet or the surface of the paper feed roll at the time of double-sided copying at the same time, stationery tapes can be adhered to the obtained copy sheet. There is a problem that the paper is not fed smoothly by the paper feed roll.

[0009] Therefore, there is a need for a roll having a highly releasable surface even under conditions where the amount of silicone oil used is reduced or hardly used. In the study of such a highly releasable surface, it has been proposed to reduce the adhesive force between the toner and the surface of the fixing roll because the releasing effect of the oil is reduced. And
As means for achieving this, it has been practiced to further reduce the surface energy of a fluororubber material or a fluororesin material provided on the roll surface. For example, JP-A-6-2505
No. 53 proposes a fixing roll in which a low-molecular-weight tetrafluoroethylene resin is blended in a peroxide-crosslinked fluororubber with 60 parts by weight or more per 100 parts by weight of the fluororubber. Further, JP-A-9-185279, JP-A-8-185279
Japanese Patent Application Laid-Open No. 160795 and Japanese Patent Application Laid-Open No. 9-12816 propose a fixing roll in which a fluororesin paint and a fluororubber paint are mixed at about 1: 1 and baked.

However, these fixing rolls include:
There were the following problems. That is, PT
When a fluororesin such as FE or PFA is added, if the addition amount is excessive, the physical properties such as the rubber strength of the fluororubber are originally reduced, and the elongation and the rubber elasticity are lowered. Due to this decrease in rubber elasticity, the toner image cannot be fixed uniformly, and there has been a problem that high image quality cannot be obtained particularly for a color toner image. Further, when a fluororesin is added to the fluororubber, if the addition amount is excessive, the gloss on the roll surface is reduced, and the fixing gloss of the toner is also reduced. Further, there is a problem in that when the fluororubber paint and the fluororesin paint are mixed, applied, and baked, the heat during baking deteriorates the heat-resistant elastic layer of the roll.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and achieve the following objects. That is, an object of the present invention is to provide an electrophotographic fixing member which is excellent in releasability from a toner, can obtain a high-quality image, and has excellent mechanical strength and durability, and a fixing device using the same. I do.

[0012]

Means for solving the above problems are as follows. <1> In an electrophotographic fixing member having at least a surface layer on a base material, the surface layer has a low molecular weight having a volume average particle diameter of 0.01 to 10.0 μm with respect to 100 parts by weight of fluororubber. An electrophotographic fixing member comprising a vulcanized rubber composition containing 3 to 70 parts by weight of ethylene tetrafluoride resin fine particles. <2> The electrophotographic fixing member according to <1>, wherein the surface layer has a surface roughness of 0.1 to 5 μm. <3> The electrophotographic fixing member according to <1> or <2>, wherein the surface layer has a surface gloss of 50 to 95. <4> The above <1> to <3> in which the substrate is a roll.
5. The fixing member for electrophotography according to any one of the above. <5> It has a pair of fixing rolls composed of a heating roll and a pressure roll pressed against the heating roll, and allows a recording material supporting an unfixed toner image to pass through a nip region formed by the pair of fixing rolls. In a fixing device that performs fixing by heat and pressure, at least one of the heating roll and the pressure roll is the fixing member for electrophotography according to any one of <1> to <4>. It is a fixing device.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. [Electrophotographic fixing member] The electrophotographic fixing member of the present invention has at least a surface layer on a substrate, and further has other layers as necessary.

(Substrate) The substrate used in the present invention is not particularly limited, and its material and size can be appropriately selected according to the purpose. The fixing member for electrophotography of the present invention includes a fixing roll, a rubber belt, a rubber blade, a release agent oil supply blade, and the like used for fixing. Among these, a fixing roll is preferable. As the base material in the fixing roll, for example, a core metal such as iron and aluminum is preferably used.

(Surface Layer) The surface layer contains a vulcanized product of a specific rubber composition, and further contains other components as necessary. The specific rubber composition is composed of at least fluororubber and fine particles of low molecular weight ethylene tetrafluoride resin, and further contains other components as necessary. The fixing member for electrophotography according to the present invention is characterized by using low molecular weight tetrafluoroethylene resin fine particles having a volume average particle diameter of 0.01 to 10.0 μm. By adding molecular weight tetrafluoroethylene resin fine particles to the fluororubber, the uneven distribution of the tetrafluoroethylene resin in the fluororubber is prevented, a uniform composite layer is formed, and the crosslinking temperature is higher than the high temperature required for the fluororesin. Since the temperature can be lowered to the low temperature required for fluororubber, and the thermal degradation of the elastic layer material of the roll can be prevented, excellent releasability from toner, high quality images can be obtained, and mechanical strength and durability can be improved. An excellent fixing member for electrophotography can be obtained.

-Fluororubber- The fluororubber constituting the rubber composition is a vulcanizable fluorinated elastic polymer, and any conventionally known fluororubber can be used. .
For example, vinylidene fluoride-propylene hexafluoride copolymer (VDF-HFP), vinylidene fluoride-propylene hexafluoride-ethylene tetrafluoride terpolymer (VDF-H)
FP-TFE), ethylene tetrafluoride-propylene copolymer (TFE-PP), vinylidene fluoride-phosphazene propylene (VDF-PHP) and the like.

-Low molecular weight tetrafluoroethylene resin fine particles-The low molecular weight tetrafluoroethylene resin fine particles constituting the rubber composition are polymers of ethylene tetrafluoride having a weight average molecular weight on the order of 10 ³ to 10 ^5. So far, it has been used as an additive for lowering the coefficient of friction and improving abrasion resistance of rubber, plastic, oil, ink, paint and the like. For example, Lubron L-2, L-5, L
-5F (Daikin Industries), MP-1100, 1200,
1300, 1400, 1500, TLP-10F (Mitsui DuPont Fluorochemical) and the like.

The volume average particle diameter of the low molecular weight ethylene tetrafluoride resin fine particles is 0.01 to 10.0 μm, preferably 0.1 to 7.0 μm, more preferably 0.5 to 7.0 μm.
It is 5.0 μm. When the volume average particle size is less than 0.01 μm, the cohesiveness of the particles is increased and the particles cannot be uniformly dispersed. On the other hand, if the volume average particle size exceeds 10.0 μm, the particles are too large and the surface roughness of the film becomes rough.

The compounding amount of the low molecular weight ethylene tetrafluoride resin fine particles in the rubber composition is 100
3 to 70 parts by weight, preferably 1 to 10 parts by weight
It is 0 to 60 parts by weight, more preferably 15 to 50 parts by weight. If the amount is less than 3 parts by weight, the effect of addition is not exhibited. On the other hand, when the compounding amount is more than 70 parts by weight, physical properties such as rubber strength of the fluororubber decrease, and elongation and rubber elasticity decrease.

-Other components-The above-mentioned rubber composition contains, as a vulcanization accelerator, a vulcanization acceleration auxiliary, a cross-linking auxiliary, a vulcanization activator, etc., for vulcanization. Known organic and inorganic compounds can be added. Specific examples include magnesium oxide, calcium hydroxide, triallyl isocyanate and the like.
The amount of these additives is 1 to 100 parts by weight of the fluoro rubber.
-5 parts by weight is preferred. Further, inorganic compounds such as carbon black, silica, calcium carbonate, clay, and talc, which are known as fillers or reinforcing agents for rubber, can also be added. However, when a metal oxide such as silica, magnesium oxide, or zinc oxide, which is generally known as a high surface energy substance, is used, it is preferable to minimize the amount of the metal oxide.

—Surface Roughness / Surface Gloss— The surface roughness of the surface layer is preferably 0.1 to 5 μm.
0.3 to 3 μm is more preferable. The surface roughness is 0.1μ
When the surface roughness is smaller than m, it is difficult to obtain the effect of realizing a low tackiness surface due to the roughness. On the other hand, when the surface roughness is larger than 5 μm, the gloss of the fixing member surface is reduced, and the fixed image gloss during double-sided printing is reduced. May drop. The surface gloss of the surface layer is preferably from 50 to 95, more preferably from 60 to 90. If the surface gloss is lower than 50, the fixed image gloss at the time of double-sided printing may decrease, while if the surface gloss is higher than 95, surface tackiness due to a glossy surface may be exhibited.

In the present invention, the rubber composition is vulcanized to form a vulcanizate, which is then provided to the surface layer. As the method for vulcanizing the rubber composition, any of amine vulcanization, polyol vulcanization, peroxide vulcanization and the like may be used. Known vulcanization conditions can be used.

The surface layer has a thickness of 1 to 300 μm.
m is preferable, and 10 to 200 μm is more preferable. If the thickness is less than 1 μm, it may be worn out due to friction with paper or toner, while if the thickness exceeds 300 μm, heat conduction from the heating element inside the roll may be reduced. .

(Other Layers) -Heat-Resistant Elastic Layer- In the fixing member for electrophotography of the present invention, a heat-resistant elastic layer is provided on the outer peripheral surface of the substrate, and the rubber composition is provided on the outer peripheral surface of the heat-resistant elastic layer. A surface layer containing a vulcanizate of the product can be formed. As the heat-resistant elastic layer, silicone rubber, fluorine rubber, or the like can be used, and a heat-resistant elastic layer made of silicone rubber is particularly preferable. The thickness of the heat-resistant elastic layer is preferably 0.5 to 5 mm, and 1.0 to 3 mm.
Is more preferred.

—Adhesive Layer— In the fixing member for electrophotography according to the present invention, the heat-resistant elastic layer and the surface layer can be joined via an adhesive layer called a primer. As the primer, a silane compound is typical, and among them, alkoxysilane is frequently used. Further, in order to strengthen the bonding at the interface, it is general that the surface of the heat-resistant elastic layer is subjected to a surface treatment before the bonding, and the surface treatment includes alkali treatment, ultrasonic treatment, and the like. And wet treatments such as etching treatments, corona treatments, plasma treatments, ultraviolet (UV) irradiation treatments, electron beam irradiation treatments, laser irradiation treatments and the like, and these treatments are performed alone or in combination. The above surface treatment can be performed on the surface of the base material even when the base material and the surface layer are joined via an adhesive layer.

The electrophotographic fixing member of the present invention having the above-described structure has the characteristics that the toner has excellent releasability and the surface has very excellent water and oil repellency. It can be used in various fields. That is, in any apparatus for the purpose of image formation including an electrophotographic copying machine, for example, a rubber roll or a rubber belt whose function, performance, and commercial value are reduced by an image forming material such as toner or ink adhering to its surface. , Can be applied to rubber materials such as rubber blades, and in general office machines including electrophotographic copying machines or other fields,
All rubber products where water repellency, oil repellency and durability are important
It can be applied to rubber parts.

[Fixing Device] The fixing device of the present invention has a pair of fixing rolls composed of a heating roll and a pressure roll pressed against the heating roll, and a nip region formed by the pair of fixing rolls is undetermined. A fixing device that passes a recording material supporting a toner image and performs fixing by heat and pressure, wherein at least one of the heating roll and the pressure roll is the fixing member for electrophotography of the present invention. Features. Since the fixing device of the present invention includes the above-described fixing member for electrophotography of the present invention, the fixing device is excellent in releasability from toner, a high-quality image is obtained, and excellent in mechanical strength and durability.

Next, the fixing device of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram illustrating an example of the fixing device of the present invention. In the figure, a heating roll 1 and a pressure roll 2 are provided to face each other as a pair of fixing rolls, and a nip is formed by pressing them. Heating roll 1
Is a heat-resistant elastic layer 1B and a surface layer 1 on a hollow metal core 1A (base material) made of metal having a heater lamp 1D inside.
C is formed. In the present invention, as described above, the surface layer 1C is made of a vulcanizate of a rubber composition in which low-molecular-weight ethylene tetrafluoride resin particles having a specific particle diameter are blended with fluororubber.

On the surface of the heating roll 1, a release agent applying device 5 for applying a release agent oil, a cleaning device 6 for cleaning the roll surface, and an external heating device 7 for heating the roll from the surface are provided. A peeling claw 8 for peeling the sheet after fixing, and a temperature sensor 9 for controlling the temperature of the roll surface. The pressure roll 2 is configured such that a heat-resistant elastic layer 2B and a surface layer 2C are formed on a metal hollow core 2A (base material) having a heater lamp 2D therein. A recording material 3 such as plain paper on which an unfixed toner image 4 is formed is passed through a nip area formed by the heating roll 1 and the pressure roll 2, and fixing is performed by heat and pressure.

[0030]

EXAMPLES Examples of the present invention will be described below, but the present invention is not limited to these examples. [Synthesis of Rubber Composition] 6 of Synthesis Examples 1 to 6 shown in Table 1 below
Various types of rubber compositions were synthesized. Synthesis Example 1
In Examples 3 to 3, peroxide vulcanization type G-952 (manufactured by Daikin Industries, Ltd.) was used, and in Synthesis Examples 4 to 6, polyol vulcanization type G-702 (manufactured by Daikin Industries, Ltd.) was used.
Low-molecular-weight ethylene tetrafluoride resin fine particles are Lubron L-
5F (manufactured by Daikin Industries, Ltd.) was used. These resin fine particles have a weight average molecular weight of about 400,000 and a volume average particle size of 5.0 μm. As the metal oxide, magnesium oxide (manufactured by Kyowa Chemical Industry Co., Ltd.), and as the peroxide,
Peroxide perhexa (manufactured by NOF Corporation), as a vulcanization aid, triallyl isocyanate (TAIC)
(Manufactured by Daikin Industries, Ltd.). In addition, the unit of the numerical value in Table 1 represents a weight part.

[0031]

[Table 1]

Each of the rubber compositions having the compositions shown in Synthesis Examples 1 to 6 in Table 1 was press-cured at 180 ° C. for 15 minutes, and further subjected to secondary vulcanization at 230 ° C. for 12 hours in an oven.
A plate-like sample was prepared. When the contact angle of pure water was measured on the surface of the obtained plate-shaped sample, Synthesis Example 1 was obtained.
Is 107 °, Synthesis Example 2 is 110 °, Synthesis Example 3 is 95 °,
Synthesis Example 4 had 117 °, Synthesis Example 5 had 121 °, and Synthesis Example 6 had 97 °. From these results, Synthesis Examples 1, 2, and 4
It can be seen that the rubber compositions of Examples 5 and 5 have significantly improved water repellency on the surface of the fluororubber by adding low molecular weight ethylene tetrafluoride resin fine particles.

(Example 1) [Preparation of heating roll] In FIG. 1, a heat-resistant elastic layer 1B (rubber hardness: 33 °) made of a silicone rubber having high thermal conductivity is formed on a hollow metal core 1A (base material) made of metal. Was coated on a base roll having a thickness of 3 mm, the rubber composition of Synthesis Example 1 was coated to a thickness of 30 μm, and baked at 230 ° C. for 3 hours to form a surface layer 1C. Was prepared. The surface roughness of the surface layer of the obtained heating roll was measured using Surfcom (manufactured by Tokyo Seimitsu Co., Ltd.) and found to be 1.1 μm. The surface gloss of the surface layer is measured using a micro gloss meter (BYK-
It was 82 when measured using Gardner Co.). Hereinafter, the surface roughness and the surface gloss were measured using the same apparatus.

[Preparation of Pressure Roll] A heat-resistant elastic layer 2B (rubber hardness: 33 °) made of silicone rubber having high thermal conductivity was formed to a thickness of 2 mm on a metal hollow core 2A (base material). On the base roll, add the rubber composition of Synthesis Example 3 to 3
0 μm, and baked at 230 ° C. for 3 hours in the same manner as in the case of the heating roll 1 to obtain a surface layer 2C.
The pressure roll 2 was produced by forming.

[Preparation of Fixing Apparatus] For these roll pairs, halogen lamps 1D and 2D of 800 W and 700 W are provided inside, respectively.
The temperature was set to 220 ° C., the speed was set to 220 mm / sec, and the nip width was set to 10 mm. Further, a release agent applying device 5 for supplying a release agent oil to the surface of the heating roll was provided. As a release agent oil, a color fuser oil manufactured by Fuji Xerox Co., Ltd. was supplied to the heating roll surface in an amount of 2.5 μl / A4 size.

<Evaluation of Fixing Property> An oil-less color toner (cyan) manufactured by Fuji Xerox Co., Ltd. was used as a toner, and an unfixed toner image similarly formed on J paper manufactured by Fuji Xerox Co., Ltd. was heated as described above. Roll surface temperature to 120
The temperature was changed to １８０180 ° C., and introduced into and passed through a nip region formed by the heating roll 1 and the pressure roll 2, and fixed by heat and pressure, and the fixing state was evaluated. Incidentally, the toner density of the unfixed toner image was 1.5 mg / cm ² .

The releasability is determined by subtracting the minimum fixing temperature (MFT) at which cold offset does not occur from the temperature at which hot offset occurs (fixing allowable temperature range of the heating roll). If it was, it was evaluated as having excellent releasability. The suitability for high image quality was evaluated as ○ when no fine gloss unevenness which adversely affects high image quality was observed, Δ when slight fine uneven gloss was observed, and × when fine fine unevenness was observed a lot. Mechanical strength and durability were evaluated as follows: も の: No roll wear was observed even after the 20,000-sheet copy pass test. を: Roll-free wear was not observed even after the 10,000-sheet copy pass test. During the copy pass test up to 10,000 sheets,
Those in which abrasion of the roll was recognized were evaluated as x. The evaluation results are shown in Table 2 below.

Example 2 The procedure of Example 1 was repeated except that the material of the surface layer 1C of the heating roll 1 was changed from the rubber composition of Synthesis Example 1 to the rubber composition of Synthesis Example 2.
A two-roll type fixing device having the same configuration as that described above was manufactured. At this time, the surface roughness of the surface layer in the obtained heating roll,
It was 2.7 μm. The surface gloss of the surface layer was 75. Using this fixing device, the unfixed toner image was fixed under the same conditions as in Example 1, and the same evaluation was performed. The evaluation results are shown in Table 2 below.

Comparative Example 1 The procedure of Example 1 was repeated except that the material of the surface layer 1C of the heating roll 1 was changed from the rubber composition of Synthesis Example 1 to the rubber composition of Synthesis Example 3.
A two-roll type fixing device having the same configuration as that described above was manufactured. At this time, the surface roughness of the surface layer in the obtained heating roll,
It was 0.5 μm. The surface gloss of the surface layer was 93. Using this fixing device, the unfixed toner image was fixed under the same conditions as in Example 1, and the same evaluation was performed. The evaluation results are shown in Table 2 below.

(Example 3) In Example 1, the material of the surface layer 1C in the heating roll 1 was changed from the rubber composition of Synthesis Example 1 to the rubber composition of Synthesis Example 4, and the surface of the heating roll was released from the mold. Release agent applying device 5 for supplying agent oil
A two-roll fixing device having the same configuration as in Example 1 except that no fixing device was provided was manufactured. At this time, the surface roughness of the surface layer in the obtained heating roll was 3.6 μm.
The surface gloss of the surface layer was 63. Using this fixing device, an unfixed toner image was fixed under the same conditions as in Example 1 except that no release agent oil was supplied, and the same evaluation was performed. The evaluation results are shown in Table 2 below.

(Example 4) In Example 1, the material of the surface layer 1C in the heating roll 1 was changed from the rubber composition of Synthesis Example 1 to the rubber composition of Synthesis Example 5, and the surface of the heating roll was released from the mold. Release agent applying device 5 for supplying agent oil
A two-roll fixing device having the same configuration as in Example 1 except that no fixing device was provided was manufactured. At this time, the surface roughness of the surface layer in the obtained heating roll was 4.5 μm.
The surface gloss of the surface layer was 55. Using this fixing device, an unfixed toner image was fixed under the same conditions as in Example 1 except that no release agent oil was supplied, and the same evaluation was performed. The evaluation results are shown in Table 2 below.

(Comparative Example 2) In Example 1, the material of the surface layer 1C of the heating roll 1 was changed from the rubber composition of Synthesis Example 1 to the rubber composition of Synthesis Example 6, and the surface of the heating roll was released from the mold. Release agent applying device 5 for supplying agent oil
A two-roll fixing device having the same configuration as in Example 1 except that no fixing device was provided was manufactured. At this time, the surface roughness of the surface layer in the obtained heating roll was 0.7 μm.
The surface gloss of the surface layer was 91. Using this fixing device, an unfixed toner image was fixed under the same conditions as in Example 1 except that no release agent oil was supplied, and the same evaluation was performed. The evaluation results are shown in Table 2 below.

[0043]

[Table 2]

From the results shown in Table 2, it can be seen that when the fixing devices of the present invention of Examples 1 to 4 are used, the allowable fixing temperature range is wide and the releasability is excellent. Also, fine gloss unevenness that adversely affects high image quality is not recognized, and it has high image quality aptitude,
After a copy passing test of 10,000 sheets or more, no abrasion of the roll was observed, and it was found that the roll had excellent mechanical strength and durability.

[0045]

According to the present invention, there is provided a fixing member for electrophotography which is excellent in releasability from toner, can provide a high quality image, and has excellent mechanical strength and durability, and a fixing device using the same. can do.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating an example of a fixing device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating roll 1A Hollow core metal core (base material) 1B Heat resistant elastic layer 1C Surface layer 1D heater lamp 2 Pressure roll 2A Hollow core metal core (Base material) 2B Heat resistant elastic layer 2C Surface layer 2D heater lamp 3 Recording material 4 Unfixed toner image 5 Release agent coating device 6 Cleaning device 7 External heating device 8 Peeling claw 9 Temperature sensor

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) (C08L 27/12 (C08L 27/12 27:18) 27:18) F-term (reference) 2H033 AA09 AA23 BB05 BB14 BB15 BB29 BB30 3J103 AA02 AA14 AA72 BA03 BA41 FA30 GA66 HA04 HA11 HA53 HA54 4F006 AA04 AB05 AB19 BA05 BA09 BA11 BA12 CA01 CA03 DA04 DA05 4J002 BB141 BD141 BD151 BD152 BD161 CQ011 FA082 GM00

Claims (5)

[Claims] 1. An electrophotographic fixing member having at least a surface layer on a substrate, wherein the surface layer is made of fluororubber 10
The volume average particle size is 0.01 to 10.0 with respect to 0 parts by weight.
3 to 70 μm low molecular weight ethylene tetrafluoride resin fine particles.
A fixing member for electrophotography, comprising a vulcanizate of a rubber composition blended in parts by weight. 2. The method according to claim 1, wherein the surface layer has a surface roughness of 0.1 to 5 μm.
2. The fixing member for electrophotography according to claim 1, wherein m is m. 3. The surface layer has a surface gloss of 50 to 95.
The electrophotographic fixing member according to claim 1, wherein 4. The method according to claim 1, wherein the substrate is a roll.
The fixing member for electrophotography according to any one of the above. 5. A recording material which has a pair of fixing rolls composed of a heating roll and a pressure roll pressed against the heating roll, and supports a non-fixed toner image in a nip region formed by the pair of fixing rolls. 5. A fixing device for performing fixing by heat and pressure, wherein at least one of the heating roll and the pressure roll is the fixing member for electrophotography according to claim 1. 6. apparatus.