JPH08328418A - Coating member of fluororesin and its production and fixing member formed by using the coating member - Google Patents

Abstract

PURPOSE: To obtain secure adhesiveness and good surface smoothness by forming a fluororesin coating layer of a water-base fluororesin dispersed coating material on a fluororesin-contg. fluororubber layer. CONSTITUTION: The fluororesin layer 13 of the fluororesin coating member 11 having the fluororesin layer 13 on the fluororubber layer 12 contg. the fluororesin is so formed as to be the uniform layer formed by applying the water-base fluororesin dispersed coating material on the layer and baking the coating. The process for producing the fluororesin coating 11 consists of a second stage of applying the water-base fluororesin dispersed coating material and baking the coating in succession the first stage of vulcanizing and curing the fluororubber layer 12 and further a third stage for executing baking. A fluororesin dispersion which is water-base colloidal suspension of the particulates of the fluororesin and the water-base enamel coating material and the like prepd. by compounding the dispersion with a nonionic surfactant, thickener, crack preventive agent, pH control agent, etc., and the like are used as the water-base fluororesin dispersed coating material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a member in which an elastic rubber layer is coated with a fluororesin, a method for manufacturing the member, a copying machine,
The present invention relates to a fixing member and a heat fixing device used for forming an electrophotographic image in a printer or the like.

[0002]

2. Description of the Related Art A member in which a rubber layer is coated with a fluororesin is used as various members which require elasticity due to the rubber layer and releasability and slipperiness due to the fluororesin layer. For example, a fixing member for a toner image formed by an electrophotographic method, a cleaning blade for an electrophotographic photosensitive member, and the like.

As a method of forming such a covering member,
In order to improve the adhesion between the rubber layer and the fluororesin layer, a fluororesin powder is contained in the rubber layer, and the method for coating the fluororesin on the rubber layer is as follows. A method of electrostatically coating and firing resin powder is known (Japanese Patent Laid-Open No. 61-128274).

However, since a large amount of fluororesin powder is projected on the surface of the fluororubber layer when the fluororubber layer is fired, problems such as cracks and irregularities are likely to occur in the surface properties of the fluororesin film.

Further, if the smoothness of the surface is required, a method of laminating and heat-melting a fluororesin film instead of coating and baking the fluororesin powder can be considered, but lamination to a cylindrical substrate is a seam. There is a problem in the processing peculiar to the laminating method such as the processing of.

[0006]

The problem to be solved is that the member in which the elastic rubber layer is coated with the fluororesin is inferior in surface smoothness and adhesion durability.

[0007]

According to the present invention, in a fluororesin coating member having a fluororesin layer on a fluororubber layer containing a fluororesin, the fluororesin layer is formed by applying an aqueous fluororesin dispersion coating material and baking it. The fluororesin-coated member is characterized by a uniform layer.

Further, according to the present invention, in a fixing member having a fluororubber layer containing a fluororesin on a substrate and a fluororesin layer as a coating layer for the fluororubber layer, the fluororesin layer is coated with an aqueous fluororesin dispersion coating material and baked. The fixing member is characterized by being formed uniformly.

The present invention also provides a method for producing a fluororesin-coated member having a fluororesin layer on a fluororubber layer containing a fluororesin, which comprises vulcanizing and curing the fluororubber layer,
A method for producing a fluororesin-coated member, characterized in that a uniform fluororesin layer is formed by applying, drying and baking an aqueous fluororesin-dispersed paint.

According to the present invention, the fluororubber layer containing the fluororesin is coated with the fluororesin layer using the aqueous fluororesin-dispersed paint to improve the surface smoothness and the adhesion durability to the fluororubber layer. An excellent uniform fluororesin layer can be obtained.

That is, in order to form a uniform fluororesin layer, the aqueous fluororesin-dispersed paint is applied uniformly. The uniformly applied aqueous fluororesin-dispersed paint has excellent surface smoothness and By the action of the fluororesin in the fluororubber layer, a fluororesin layer having excellent adhesion durability is formed.

In the method for producing a fluororesin coating according to the present invention, first, the first step of vulcanizing and curing the fluororubber layer is followed by the second step of applying and drying the aqueous fluororesin-dispersed coating material.
And the third step of firing. The fluororesin contained in the rubber layer does not float on the surface of the rubber layer during vulcanization and curing, and the water-based fluororesin-dispersed coating material in the second step is well applied and can be easily applied. As a result, the surface of the fluororesin film after firing is a continuous layer without cracks,
That is, a uniform fluororesin layer is formed. That is, a uniform fluororesin layer can be formed by vulcanization and curing treatment at a temperature at which a uniform fluororesin layer is formed.

The aqueous fluororesin dispersion coating material is a fluororesin dispersion which is an aqueous colloidal suspension of fine particles of fluororesin, and a nonionic surfactant, a thickener, a crack preventive, and a pH adjuster. A water-based enamel paint or the like containing an agent or the like is used.

Fluorine rubber shows elasticity by a cross-linking reaction and is vinylidene fluoride (VD).
So-called vinylidenefluoride-based fluororubber mainly containing F) and tetrafluoroethylene (TFE)
A propylene / tetrafluoroethylene-based fluororubber based on an alternating copolymer of propylene and propylene (P) is used.

The fluororesin is a thermoplastic fluororesin having a melting point. Melting point is DSC (differential scanning calorimeter)
The melting point of the main fluororesins is PTF.
E (Polytetrafluoroethylene) 327 ° C PFA
(Tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer) 302 to 310 ° C. FEP (tetrafluoroethylene / hexafluoropropylene copolymer) 270 ° C. ETFE (tetrafluoroethylene / ethylene copolymer) 260 ° C.

The vulcanization and curing temperature of the fluororubber layer is uniform,
That is, it is set so that a fluororesin layer which is a continuous layer without cracks can be formed, and when the melting point of the fluororesin contained in the fluororubber layer is mp ₁ , (mp ₁ −30 ° C.) or less, particularly (mp ₁ -40 ° C.) or lower is suitable for suppressing the phenomenon that the fluororesin contained in the fluororubber layer floats on the surface. The firing temperature of the fluororesin layer is a fluororesin having a melting point above, (mp ₁ -40 ℃) or higher, it is preferable in particular (mp ₁ -30 ℃) or higher. Next, a preferred embodiment of the present invention will be described.

For the fluororubber layer, a polyamine vulcanizing fluororubber coating mixed with a fluororesin is applied and dried to 100 ° C.
It is vulcanized and cured in a temperature range of 230 ° C. The smoothness of the fluororubber layer affects the smoothness of the finished fluororesin. It is preferable that the fluororubber layer is made into a paint and the smoothness is obtained by leveling the paint. Further, it is advantageous in terms of workability since it is not affected by the shape of the substrate due to being made into a paint. At this time, since the coating and drying process becomes long, it is easy to handle the polyamine vulcanization system which is relatively slow in vulcanization.

If the vulcanization temperature is 100 ° C. or lower, the reaction is difficult to proceed and vulcanization may be insufficient. On the other hand, 230 ° C
If the temperature exceeds the value, the fluororesin particles mixed in the fluororubber will float on the surface at the same time as the vulcanization and become in a fluororesin rich state, and if heated above the melting point of the fluororesin, the floated fluororesin will melt and A fluororesin thin film is also formed on the rubber surface. In either case, the wettability of the aqueous fluororesin coating material on the surface of the fluororubber layer in the second step is lowered, and a uniform surface of the fluororesin layer after firing cannot be obtained. The vulcanization time may be selected so that vulcanization and curing proceed sufficiently at each vulcanization temperature.

Firing for coating the fluororesin is carried out at a temperature of 300 ° C.
It is preferable to carry out in the temperature range of 350 ° C.

The purpose of the baking is to form a film by heat-melting the coated fluororesin, and further baking causes the fluororesin particles in the fluororubber to become rich at the interface with the surface layer. It melts and strengthens the adhesion with the surface layer. For that purpose, it is preferable to bake at 300 ° C. or higher, and 350 ° C. or lower is preferable in order to prevent brittleness due to thermal deterioration of the fluororubber.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION When the fluororesin-coated member is used as a heat fixing member for an electrophotographic image forming apparatus, a fluororubber layer and a fluororesin layer are formed on an appropriate base material. As the base material, a film, a roller, or the like is used. A fixing belt using a film as a base material is a fixing member used in a film fixing method for the purpose of energy saving. The film fixing method is a fixing method in which unfixed toner on the transfer material is heated via a film-shaped endless belt.
In this fixing method, a fixing film and a pressure roller are brought into pressure contact with each other, a transfer paper on which an unfixed toner image is formed is passed through the fixing film, and a ceramic heater is directly heated to fuse the toner onto the transfer material.

A typical structure of such a fixing film is shown in FIG. On the base material of the heat-resistant cylindrical film 11,
Fluororesin-containing fluororubber layer 12 and fluororesin layer 1
3 are formed.

Since the fluororesin-coated member of the present invention has the fluororesin surface layer film having good smoothness and strong adhesion durability, it is suitable for a fixing member which is repeatedly deformed at high temperature for a long time. In particular, the fixing film is in direct contact with the unfixed toner image, and the surface property of the fixing film has a great influence on the quality of the fixed image. Therefore, the surface smoothness is further required.

Generally, when the surface smoothness of the fixing film exceeds +10 point average roughness Rz of 10 μm, the surface unevenness of the fixing film remains as a transfer mark on a solid black image, so that Rz is 5 μm.
The following are desired:

Since the fluororubber mixed with the fluororesin is made into a paint, a cylindrical film can be easily processed into a smooth surface. The coating method is not particularly limited as long as it is a conventionally known method capable of forming a uniform film, such as a spray method or a dip method.

As the cylindrical film used for the fixing film, various heat resistant films are used, and particularly the thermal conductivity is 5 × 10 ⁻⁴ to 8 × 10 ⁴ cal / cm · sec.
A curable polyimide resin in the range of ° C is preferable.

The thickness of the film is 10 μm from the viewpoint of strength.
Above 80 μm or less is preferable in terms of heat conduction.

Usually, the surface of a cylindrical film formed by dip molding or the like using a polyimide varnish containing no filler is a very smooth surface, and it is possible to finish the surface with Rz of 1 μm or less. When molding is performed by adding a filler, unevenness may occur on the belt surface. According to the fluororesin coating method according to the fourth invention of the present application, by applying a fluororubber in which a fluororesin which has been made into a paint is applied, irregularities are alleviated, and a fixing film having a relatively smooth fluororesin surface is obtained. You can

When the fixing member is a fixing roller, a roller is used as the base material. A typical configuration of the fixing roller is shown in FIG. That is, the core metal 21 is composed of a silicone rubber roller 22, a fluororesin-containing fluororubber layer 23, and a fluororesin layer 24.

The fixing roller is a so-called heat roller,
And a pressure roller. An electric heater is arranged inside the heat roller, and a pressure roller is brought into pressure contact with the recording paper on which a toner image is formed to pass between the rollers to heat the toner, thereby melting and fixing the toner on the recording paper. . At this time, the fixing effect by the elastic layer on the side that contacts the toner at the time of fixing is known, and a certain rubber thickness is required to obtain a sufficient effect. Further, the heat roller is also required to have thermal conductivity. In order to balance the above two points, the rubber thickness is preferably 100 μm to 2 mm.

The pressure roller is required to secure a contact area with a heat source such as a heat roll due to elastic deformation, and the rubber thickness is preferably 1 mm to 5 mm.

The fluororesin layer coated on these rubber rollers is required to have smoothness for obtaining a good toner-fixed image and adhesion durability to withstand repeated deformation at high temperature for a long time. The fluororesin-coated member of the present invention is suitable for the coating method.

As the pressure roller, it is preferable to use a silicone rubber roller having a rubber hardness of 30 ° (JIS-A) or less as a base material.

The pressure roller obtained according to the present invention has not only sufficient surface smoothness and adhesive durability of the fluororesin layer, but also a rubber roller having a low rubber hardness is lightly coated to have sufficient transportability. can get.

The thickness of the fluororesin film is preferably 5 to 30 μm in consideration of wear during use and film formability during processing.

FIG. 3 is a schematic sectional view when the fixing member of the present invention is used as a heat fixing device.

A fixing roller 1 and a pressure roller 2 are provided as fixing unit rollers, and an oil applying means 3 for applying a silicone oil for releasing toner is provided on the surface of the fixing roller 1. .

In the fixing roller 1, an elastic layer 22 having HTV (millable type) silicone rubber is formed on a cored bar 21 made of aluminum or the like as a base material, and the elastic layer 22 is formed.
A fluororesin-containing fluororubber layer 23 is formed on the top. Further, a fluororesin layer 24 is formed on the fluororubber layer 23.
Are formed.

The pressure roller 2 is made of an aluminum cored bar 21.
A fluororesin-containing fluororubber layer 23 is formed thereon, and a fluororesin layer 24 is formed on the layer 23.

Core bar 21 of fixing roller 1 and pressure roller 2
A halogen heater 4 is arranged as a heating element in the core bar 21 of the thermistor 5 which contacts the temperature of the pressure roller 2 with the halogen heater 4.
The temperature of the fixing roller 1 and the pressure roller 2 is maintained constant at 170 ° C. Further, the fixing roller 1 and the pressure roller 2 are rotationally driven in the direction of arrow b by a driving device (not shown), and the arrow a by a conveying device (not shown).
The recording material p such as paper or film conveyed in the direction is passed while being pressed by both rollers, and as a result, the unfixed toner image T on the recording material p is transferred onto the recording material p by heat and pressure of both rollers. It is fixed. The oil applying means 3 is adapted to suck up the offset preventing silicone oil housed in the container 31 between the upper and lower supply rollers 32 and 33 and apply it to the surface of the fixing roller 1. The amount of silicone oil applied is adjusted by the oil amount adjusting blade 3 which is brought into contact with the upper supply roller 33.
The contact angle of 4 and the pressure are adjusted. Further, the fixing roller 1 and the pressure roller 2 may be equipped with a cleaner for cleaning dirt such as toner adhering to the roller surface.

[0041]

【Example】

(First Example) [Example 1-1] 20 mm x 100 mm pre-treated with t =
A fluororubber mixed with a fluororesin was press-vulcanized and molded on a 0.5 mm aluminum plate under a vulcanization condition of 160 ° C. × 30 min. After molding, the surface is polished to a total thickness of 2.5 m
A rubber plate with an aluminum plate of m, 20 mm × 100 mm was obtained.

The fluororubber mixed with the fluororesin is a fluororubber-added fluororubber (trade name: Daier G751, Daikin Industries) as the fluororubber, and PFA powder (trade name: MP10, Mitsui) as the fluororesin.・ Dupont fluorochemical) was kneaded at a weight ratio of 1: 1 with a kneading open roll.

The polished surface is finished to Rz = 16 μm.

On the rubber plate thus obtained, an aqueous fluororesin dispersion paint (trade name: NEOFLON FEP Dispersion ND-1, Daikin Industries, Ltd.) was applied to a thickness of about 10 μm.
It was applied by spraying.

There was no problem in the wetting property, and the coating could be performed evenly.
Further, after drying at 60 ° C. for 30 minutes, firing was performed at 310 ° C. in a warm air circulation furnace for 30 minutes. The surface roughness of the fluororesin film-forming surface after firing was Rz = 12 μm, and there was no problem with the adhesiveness with the fluororubber.

[Example 1-2] The surface was polished to obtain Rz.
= 16μm finished aluminum plate (t = 0.5μm)
With a total thickness of 2.5 mm, a silicone rubber plate of 20 mm x 100 mm is subjected to a primer treatment, and a polyamine vulcanized fluororubber paint mixed with a fluororesin is approximately 20μ thick.
It was applied by spraying so as to obtain m. After drying at 60 ° C. for 30 minutes, it was vulcanized and cured at 200 ° C. for 20 minutes in a hot air circulation furnace. A polyamine vulcanization type fluororubber coating (trade name: Daier GLS-213, Daikin Industries) mixed with FEP fluororesin was used.

Then, the aqueous fluororesin dispersion coating material ND-1 was applied and dried in the same manner as in [Example 1-1]. At this time, there was no problem in the wetting property and the coating could be performed evenly. Next, [Example 1
-1] and baking was performed to obtain a fluororesin-coated rubber plate. The surface roughness of the surface of the fluororesin film after firing is Rz = 6μ
m, and the adhesiveness with the fluororubber film was also strong.

[Example 1-3] 150 fluororubber paint
A fluororesin-coated rubber plate was obtained in the same manner as in [Example 1-2] except that vulcanization and curing were carried out at 30 ° C for 30 minutes. The surface roughness of the fluororesin film surface was Rz = 7 μm, and the adhesiveness of the fluororubber film was also strong.

[Comparative Example 1-1] Firing was carried out in the same manner as in [Example 1-2] except that the step of vulcanizing and curing the fluororubber coating was omitted, but fine cracks were generated in the fluororubber film during firing. However, the uniform fluororesin film could not be coated. This is because the fluororubber layer was not vulcanized and the fluororubber layer was broken during firing.

[Comparative Example 1-2] The procedure up to the coating of the water-based fluororesin coating material was carried out in the same manner as in [Example 1-2] except that the vulcanization and curing of the fluororubber coating material was replaced by calcination for 70 minutes at 250 ° C. However, since the fluororesin in the fluororubber layer had exuded to the surface, the wetting property was poor, unevenness occurred on the coated surface, and it was fired continuously, but it was not formed as a continuous layer of fluororesin. .

The above results are summarized in Table 1.

[0052]

[Table 1]

By properly vulcanizing the fluororesin-dispersed fluororubber, it is possible to form a film by firing with an aqueous fluororesin-dispersed paint. The smoothness of the finished surface can also be improved by converting the fluororesin-dispersed fluororubber into a paint.

Not limited to this embodiment, the coating method of the present invention can be used for coating a fluororesin on a flat article such as a cleaning blade, a developing blade, an oil scraping blade of an electrophotographic image forming apparatus.

(Second Embodiment) An embodiment in which the method of coating a fluororesin on an elastic body of the present invention is applied to the surface of a fixing film of an electrophotographic image forming apparatus will be described.

Example 2-1 Thermal conductivity of 6.5 × 10
A cylindrical film having an outer diameter of 20 mm, a length of 230 mm, and a thickness of 30 μm and made of a thermosetting polyimide of ⁻⁴ cal / cm · sec · ° C. was prepared. The surface roughness of this film was as rough as Rz = 12 μm. Approximately 50 μm in thickness of polyamine fluororubber paint in which fluororesin is mixed with this film whose surface is treated with epoxy primer.
It was applied by spraying. After drying at 60 ° C for 30 minutes,
It was vulcanized and cured in a hot air circulation oven at 200 ° C. for 30 minutes. As a polyamine-based fluororubber paint mixed with a fluororesin (trade name: Daiel GLS-213, Daikin Industries, Ltd.) was used. Next, apply a water-based fluororesin dispersion paint to a thickness of approximately 10
It was applied by spraying to have a thickness of μm. Aqueous fluororesin paint: A mixture of Neoflon FEP Dispersion ND-1 (Daikin Industries) and Neoflon PFA Disversion AD-2 (Daikin Industries) in a weight ratio of 1: 1 was used. There was no problem in the wettability and it could be applied evenly.

Further, after drying at 60 ° C. for 30 minutes, baking was carried out at 330 ° C. in a warm air circulating oven for 60 minutes to obtain a fixing film.

[Example 2-2] A fixing film was obtained in the same manner as in Example 2-1 except that the final baking was performed at 380 ° C for 30 minutes.

[Example 2-3] A fixing film was obtained in the same manner as in Example 2-1 except that the fluororubber coating was applied by spraying so as to have a thickness of about 15 µm.

[Comparative Example 2-1] Aqueous fluororesin dispersion was carried out in the same manner as in [Example 2-3] except that after coating and drying the fluororubber coating, baking was carried out at 300 ° C for 15 minutes instead of vulcanization. The paint was applied, but the wettability was poor and the coated surface was uneven, and the baking was continued until a fixing film was obtained, but a film as a continuous layer of fluororesin could not be obtained.

[Comparative Example 2-2] Coating with fluororubber paint
A fixing film was prepared by firing in the same manner as in [Example 2-3] except that the vulcanization and curing step after drying was omitted, but cracks were generated and the surface was extremely rough.

[Experimental Example] The above [Examples 2-1 to 3],
[Comparative Examples 2-1 and 2] are laser beam printers (trade name: LBP laser shot A404, manufactured by Canon)
Then, the results were shown in the table below (Table 2) after evaluation by image formation and durability test.

[0063]

[Table 2]

For image evaluation, it was examined whether or not the surface roughness of the film remained as a transfer mark on the fixed solid black image. All of the comparative examples were at a practically impossible level (x). Fixability is
The fixed solid black image was rubbed with the transfer paper at a constant number of times with a constant load, and the density was decreased at that time. All of the examples were at a practically acceptable level, and particularly [Example 2-1] was good (⊚). This is due to the elasticity of the fluororubber layer 50 μm. On the other hand, in [Example 2-2], the fluororubber became hard due to thermal deterioration during firing and the elasticity was slightly impaired. Therefore, even at the same 50 μm, it was slightly inferior to [Example 2-1], but a sufficient practical level ( ○) The durability test is
A continuous paper-passing test of A4 size paper with a specific pattern was carried out, and particularly the adhesion durability of the fluororesin layer was observed. In the example, the 100,000-sheet paper passing test was completed without any trouble, and sufficient adhesion as a fixing film was obtained. The durability was confirmed.

(Third Embodiment) An embodiment in which the surface of a pressure roller of an electrophotographic image forming apparatus is subjected to the fluororesin coating method on the elastic body of the present invention will be described.

[Example 3-1] An outer diameter of 16 mm, a rubber wall thickness of 3 mm, a rubber length of 220 mm, a rubber hardness of 25 ° (J
An IS-A) silicone rubber roller was prepared. After the surface was treated with an epoxy-based primer, a polyamine vulcanized fluororubber paint mixed with a fluororesin was spray-applied to a thickness of about 30 μm. After drying at 60 ° C. for 30 minutes, the roller surface was irradiated with near infrared rays for several tens of seconds until the roller surface reached 150 ° C. to be vulcanized and cured. The near-infrared lamp was a rod-shaped one placed in parallel with the roller shaft, and the roller was rotated at a constant speed so that the surface was heated uniformly.

DAI-EL GLS-213 was used as a polyamine vulcanizing fluororubber paint mixed with a fluororesin.

Subsequently, an aqueous fluororesin-dispersed paint was spray-applied to a thickness of about 15 μm. An aqueous fluororesin dispersion coating (trade name: NEOFLON FEP Dispersion ND-4, Daikin Industries, Ltd.) was used. The wettability could be applied without any problems. Further, after drying at 60 ° C. for 30 minutes, baking was performed at 315 ° C. in a warm air circulation furnace for 40 minutes to obtain a pressure roller.

[Example 3-2] The thickness of the fluororubber coating was changed to about 20 µm, the temperature at which the roller surface temperature reached by irradiation with near infrared rays was 220 ° C, and the thickness of the water-based fluororesin coating was changed to about 25 µm. A pressure roller was obtained in the same manner as in Example 3-1].

[Comparative Example 3-1] A pressure roller was obtained in the same manner as in [Example 3-1] except that the temperature reached by the roller surface upon irradiation with near infrared rays was changed to 90 ° C. At times, fine cracks occurred in the fluororubber layer.

[Comparative Example 3-2] A pressure roller was obtained in the same manner as in [Example 3-1] except that, instead of irradiating with near infrared rays, baking was performed in a warm air circulating furnace at 310 ° C for 30 minutes. The wettability of the aqueous fluororesin-dispersed paint was poor, and a film as a continuous layer of fluororesin could not be formed even after firing.

[Experimental Example] As described above [Examples 3-1 and 2],
Regarding [Comparative Example 3-1], LBP laser shot A
It was incorporated into 404 (manufactured by Canon Inc.) and a continuous paper passing test of A4 size paper with a specific pattern was carried out to confirm the transportability and a durability test to obtain the results shown in the following table (Table 3).

[0073]

[Table 3]

The fixing device for the LBP laser shot A404 employs a system in which a transfer roller is conveyed by a pressure roller driving and a fixing film driven mechanism, and the pressure roller is required to have a sufficient conveying force. Each of the pressure rollers had a satisfactory carrying force, and the durability of 100,000 sheets was completed without any trouble, and sufficient adhesion durability of the fluororesin layer as the pressure roller could be confirmed. By the way, a tube-covered roller having the same size and roller hardness as the present experimental example, in which a silicone rubber material having a hardness of 15 ° was coated with a PFA tube having a thickness of 50 μm, was inferior in conveyance force, and as a result of an experiment in the same manner, a transfer paper was obtained. There was a case where the conveyance failure occurred due to the slippage with.

In the pressure roller of [Comparative Example 3-1], the toner accumulated in the cracks on the surface of the pressure roller during the paper feeding endurance, and the test was stopped at 10,000 sheets.

[0076]

As described above, according to the present invention,
By forming the fluororesin coating layer on the fluororesin-containing fluororubber layer with the aqueous fluororesin dispersion paint, strong adhesion and good surface smoothness can be obtained.

Further, the coating method of the present invention can be applied to a heat fixing member of an electrophotographic image forming apparatus to obtain a fixing film / heating / pressurizing roller having excellent durability.

[Brief description of drawings]

FIG. 1 is a sectional view of a fixing film of the present invention.

FIG. 2 is a sectional view of a pressure roller of the present invention.

FIG. 3 is a schematic sectional view of a heat fixing device of the present invention.

[Explanation of symbols]

 11 Heat-Resistant Cylindrical Film 12 Fluororesin-Containing Fluoro Rubber Layer 13 Fluororesin Layer 21 Core Metal 22 Silicone Rubber Roller 23 Fluororesin-Containing Fluoro Rubber Layer 24 Fluororesin Layer

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location F16C 13/00 9037-3J F16C 13/00 A (72) Inventor Masaaki Takahashi 3-30 Shimomaruko, Ota-ku, Tokyo No. 2 inside Canon Inc. (72) Inventor Hiroaki Kumagai 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc.

Claims (13)

[Claims] 1. A fluororesin-coated member having a fluororesin layer on a fluororubber layer containing a fluororesin, wherein the fluororesin layer is a uniform layer formed by applying and baking an aqueous fluororesin-dispersed paint. A characteristic fluororesin coating member. 2. The fluororesin-coated member according to claim 1, wherein the fluororubber layer is made of polyamine-based vulcanized fluororubber. 3. A fixing member having a fluororubber layer containing a fluororesin on a substrate and a fluororesin layer as a coating layer for the fluororubber layer, wherein the fluororesin layer is formed by applying and baking an aqueous fluororesin dispersion coating material. A fixing member having a uniform layer. 4. The fixing member according to claim 3, wherein the base material is a film. 5. The film has a thermal conductivity of 5 × 10 ⁻⁴ to 8 × 1.
The fixing member according to claim 4, which is a curable polyimide resin film in the range of 0 ^-4 cal / cm · sec · ° C. 6. The fixing member according to claim 3, wherein the base material is a roller. 7. A method for producing a fluororesin-coated member having a fluororesin layer on a fluororubber layer containing a fluororesin, wherein the fluororubber layer is vulcanized and cured, and then an aqueous fluororesin dispersion paint is applied, dried and A method for producing a fluororesin-coated member, which comprises forming a uniform fluororesin layer by firing. 8. vulcanize and cure temperature, when the melting point of the fluorine resin contained in the fluorine rubber layer was mp _1, (mp ₁ -3
The method for producing a fluororesin-coated member according to claim 7, which is 0 ° C. or less. 9. The method for producing a fluororesin-coated member according to claim 8, wherein the vulcanization curing temperature is (mp ₁ -40 ° C.) or lower. 10. The method for producing a fluororesin-coated member according to claim 8, wherein the firing temperature is equal to or higher than the melting point of the fluororesin to be coated. 11. A heat fixing device for heat fixing an unfixed toner image, wherein the heat fixing portion is formed of a fluororesin coating member having a fluororubber layer containing a fluororesin and a fluororesin layer on a base material, A heat-fixing device, wherein the fluororesin layer is a uniform layer formed by applying and baking an aqueous fluororesin-dispersed coating material. 12. The heat fixing device according to claim 11, wherein the substrate is a film. 13. The heat fixing device according to claim 11, wherein the base material is a roller.