JP4846353B2 - Laminated body, fixing member using the same, fixing device, and image forming apparatus - Google Patents

Description

  The present invention relates to a laminate having heat resistance, non-adhesiveness and flexibility. In particular, the present invention relates to a laminate having a fluororesin layer suitable for use in a copying machine, a facsimile machine, a printer, and the like, a fixing member using the laminate, a fixing device using the same, and an image forming apparatus.

  In recent years, there has been a strong market demand for energy saving and high speed for image forming apparatuses such as printers, copiers, and facsimiles. In order to achieve these required performances, it is important to improve the thermal efficiency of the fixing device used in the image forming apparatus.

  In an image forming apparatus, an image transfer process or a direct method is performed on a recording material such as a recording material sheet, printing paper, photosensitive paper, or electrostatic recording paper by an image forming process such as electrophotographic recording, electrostatic recording, or magnetic recording. An unfixed toner image is formed. In this case, as a fixing device for fixing an unfixed toner image, a contact heating type fixing device such as a heat roller method, a film heating method, a belt fixing method, and an electromagnetic induction heating method is widely used.

Also, fixing members (roller shape and belt shape) used in these recent image forming apparatuses are required to have oil-less toner releasability, flexibility, elasticity and the like. In order to satisfy these requirements, a member made of a laminate is used.
As a structure of the laminated body, for example, a first layer (an elastic layer made of heat-resistant synthetic rubber) and a second layer (a fluororesin that joins the first layer and the third layer) are mainly formed on a base. And an adhesive layer (primer layer) and a third layer (a release layer made of a fluororesin) are known.

As a material constituting the elastic layer, heat-resistant rubber, particularly silicone rubber, fluorine rubber, fluorosilicone rubber, etc., which are heat-resistant synthetic rubbers, are used. The material constituting the release layer includes tetrafluoroethylene resin (PTFE), tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer resin (PFA), and tetrafluoroethylene / hexafluoropropylene copolymer. Resin (FEP) is used.
When this release layer is provided, a primer layer is formed on the surface of the elastic layer, and the above-mentioned fluororesin dispersion paint, powder paint, or fluororesin tube is laminated thereon, and the melting point of these fluororesins. It is known to form a layer by heating at the above temperature.

  However, the melting point of the fluororesin is very high, and is a severe temperature for the heat-resistant synthetic rubber used for the elastic layer. For this reason, when a fixing member is produced by heating at a high temperature, the heat-resistant synthetic rubber is thermally deteriorated, which may cause problems such as peeling of a release layer that affects the performance of the fixing member, cracks in the elastic layer, and changes in surface hardness. there were. Note that if the elastic layer is cracked or changes in surface hardness, the surface property of the fixing member is impaired, and problems such as image contamination, image unevenness, uneven glossiness, and poor image fixing may occur.

As a measure for solving the above-mentioned problem, the present applicant firstly includes a technique in which the heat-resistant synthetic rubber contains at least one selected from tin oxide and titanium oxide (addition of SnO ₂ and TiO ₂ to the heat-resistant synthetic rubber) ( For example, refer to Patent Document 1.) Or, the heat-resistant synthetic rubber contains tin oxide and at least one selected from iron oxide, carbon black, cerium oxide, and cerium hydroxide (the heat-resistant synthetic rubber contains SnO ₂ , Fe _2). A method of adding O ₃ , etc. (see, for example, Patent Document 2) has been proposed.

  By the method of Patent Document 1 or Patent Document 2, the heat resistance of the heat-resistant synthetic rubber is improved, and image smear, image unevenness, uneven gloss image fixing failure, and the like are prevented. However, when using a method for improving heat resistance by adding the above inorganic filler, the viscosity of the heat-resistant synthetic rubber is increased, and the processability when the fixing member is manufactured by coating is not necessarily sufficient. There wasn't.

As another technique, a technique has been proposed in which a phosphoric acid group is contained in a fluororesin used for forming a release layer, and the firing temperature is lowered to a temperature that the heat resistant synthetic rubber can withstand.
However, the firing temperature is a high temperature treatment of 300 ° C., and it is difficult to say that the deterioration of the heat-resistant synthetic rubber can be sufficiently suppressed (see, for example, Patent Document 3).

  On the other hand, there is an increasing demand for speeding up image forming apparatuses such as copying machines and printers. As a method for achieving such a requirement, an electromagnetic induction heating type fixing device has been proposed. For example, an IH fixing belt has been proposed in which a thin film layer having heat generation by electromagnetic induction is provided on a heat-resistant fixing belt substrate (see, for example, Patent Document 4).

  In the fixing belt having the above structure, a fluororesin is used for the release layer in the same manner as described above, and an inorganic filler having high thermal conductivity is added in order to improve thermal conductivity. For this reason, there is a problem similar to the problem described above.

Further, the present applicant has previously proposed an electromagnetic induction heating type fixing device (IH fixing device) in which the fixing belt is non-exothermic (see, for example, Patent Document 5).
That is, in Patent Document 5, the heat generating layer is not provided in the fixing belt, and the fixing belt is configured to receive heat from the heat generating material layer due to electromagnetic induction by heat conduction by contact with the heating roller. Further, the heating roller is provided with a magnetic layer between the non-heating element and the heating material layer so that the magnetic field E generated by the exciting coil is likely to concentrate, and is difficult to leak from the gap between the exciting coil and the non-heating element. Thus, the heating property is improved.
With such a configuration, problems (for example, breakage, delamination, etc.) associated with heating of layers other than the heat generating layer can be solved. However, the gap between the exciting coil and the non-heating element may be influenced by the thickness of the fixing belt and the gap between the exciting coil due to the configuration.

JP 2004-163715 A JP 2004-170758 A Japanese Patent Laying-Open No. 2005-212318 JP 2003-338365 A JP 2005-91422 A

  As described above, the method for improving the heat resistance by adding an inorganic filler causes an increase in the viscosity of the heat-resistant synthetic rubber, and the coating processability of the fixing member is difficult. In addition, in the method using the electromagnetic induction heating type IH fixing belt, the use of a fluororesin as the release layer or the addition of an inorganic filler for improving the thermal conductivity is accompanied, so that the heat-resistant synthetic rubber is thermally deteriorated or coated. There is a problem in workability.

  The present invention has been made in view of the above prior art, an elastic layer composed of a heat-resistant rubber, a primer layer that facilitates coating workability and suppresses thermal degradation of the elastic layer during processing, An object of the present invention is to provide a non-adhesive and flexible laminate having a release layer composed of a fluororesin, and to provide a fixing member, a fixing device, and an image forming apparatus using the laminate. And

  As a result of intensive studies, the present inventors have found that an adhesive layer containing an organic magnetic substance in an adhesive resin containing a fluororesin as a main component is interposed between a heat-resistant rubber layer and a fluororesin layer sequentially provided on a substrate. As a result, the inventors have found that the above-mentioned problems can be solved, and have reached the present invention. Hereinafter, the present invention will be specifically described.

That is, in the present invention, a first layer made of heat-resistant rubber, a second layer made of an adhesive resin mainly composed of a fluororesin, and a third layer made of a fluororesin are sequentially provided on the substrate. In the laminated body
The second layer is a laminate including at least an organic magnetic material.

  By adopting the above configuration, the coating property at the time of producing the laminate is good and the processing is easy, and the heat resistant rubber is not thermally deteriorated even in the heat processing. Thereby, a laminate having heat resistance, non-adhesiveness and flexibility is provided.

  Further, according to the present invention, in the above laminate, the organic magnetic material is one selected from a high spin organic molecular magnetic material, an organometallic complex magnetic material, or an organic heat-treated magnetic material, or a combination thereof. It is characterized by being.

  By using the magnetic material, the effect of suppressing the thermal deterioration of the heat resistant rubber material in the heat processing step is sufficiently exhibited. As a result, a laminate having good surface properties can be provided without causing cracks or surface hardness changes in the elastic layer.

Furthermore, the present invention is a fixing member having a roller shape or a belt shape for fixing a toner image on a transfer body in an image forming process,
The fixing member is a fixing member comprising any one of the laminates described above.

  By using the above laminate, it is possible to achieve requirements such as oil-less toner releasability, flexibility and elasticity, and provide a roller-shaped or belt-shaped fixing member with excellent fixing performance and durability. Is done.

The present invention also provides a fixing device including a fixing member for fixing a toner image on a transfer member in an image forming process,
The fixing member is a fixing device including the fixing member described above.

  By using the fixing device including the fixing member, a high-quality image without occurrence of image smear, image unevenness, gloss unevenness, image fixing failure, or the like is fixed and formed.

The present invention also includes a heating roller that generates heat by electromagnetic induction heating,
A fixing roller arranged in parallel with the heating roller;
A belt that is non-exothermic to electromagnetic induction heating that is wound around the heating roller and the fixing roller;
A pressure roller that presses the fixing roller through the belt and forms a fixing nip portion with the belt;
Heating means for heating the heating roller from its outer peripheral side by electromagnetic induction;
A fixing device comprising: a belt comprising the laminated body according to any one of the above.

  By using a belt composed of a laminate containing the organic magnetic material, it is possible to further improve the heating efficiency of electromagnetic induction heating and meet the demand for higher speed image forming apparatuses, and to prevent image contamination. Thus, a high-quality image without occurrence of image unevenness, gloss unevenness, and image fixing failure is fixed and formed.

Further, the present invention is an image forming apparatus having at least an image carrier, a charging unit, an electrostatic latent image forming unit, a developing unit, a transfer unit, a fixing unit, a charge eliminating unit, and a cleaning,
The fixing unit is an image forming apparatus including the fixing device according to any one of the above.

According to the image forming apparatus, since any one of the fixing devices described above is provided, there is no occurrence of image contamination, image unevenness, gloss unevenness, image fixing failure, or the like over time. Images are formed.
For this reason, it can be used as an image forming apparatus such as a copying machine, a printer, and a facsimile.

The second layer (primer layer) containing the adhesive resin mainly composed of the fluororesin and the organic magnetic material according to the present invention is easy in coating workability and suppresses thermal deterioration of the elastic layer during processing. This provides a laminate including a third layer (release layer) made of a fluororesin having good surface properties, heat resistance, non-adhesiveness and flexibility.
According to the fixing member of the present invention, since the third layer made of a fluororesin is provided on the surface, there is an oilless toner releasability. A fixing member having flexibility, elasticity, etc., and excellent fixing performance and durability is provided.
According to the fixing device of the present invention, it is possible to perform high-quality fixing without occurrence of image contamination, image unevenness, gloss unevenness, image fixing failure, and the like.
In addition, if an electromagnetic induction heating type fixing device having a belt configuration wound around a heating roller and a fixing roller is used, the heating efficiency of electromagnetic induction heating can be further improved, and the speed-up requirement of the image forming apparatus can be satisfied. it can.
According to the image forming apparatus of the present invention, fixing without image smear, image unevenness, gloss unevenness, image fixing failure and the like can be performed over time, and high-quality image formation can be performed.

  As described above, the laminate in the present invention has a first layer made of heat-resistant rubber, a second layer made of an adhesive resin mainly composed of a fluororesin, and a third layer made of a fluororesin on the substrate. In the laminated body in which layers are sequentially provided, the second layer contains at least an organic magnetic substance.

FIG. 1 is a schematic cross-sectional view showing a configuration example of a laminate in the present invention.
In the configuration of FIG. 1, a first layer (elastic layer) 52 made of heat-resistant rubber, a second layer (primer layer) containing an adhesive resin mainly composed of a fluororesin and an organic magnetic material are formed on a substrate 51. 53 and a third layer (release layer) 54 made of a fluororesin are sequentially provided.

That is, by containing the organic magnetic material in the second layer 53, the heat resistance for forming the first layer 52 at the time of heat processing at a high temperature while maintaining good coating properties at the time of manufacturing the laminated body. It is possible to suppress thermal degradation of the functional rubber, and a laminate having a fluororesin layer having heat resistance, non-adhesiveness and flexibility on the surface is obtained.
The laminated body 50 in the present invention may be a sheet shape, a roller shape, or a belt shape. In addition to the fixing member of the fixing device in the image forming apparatus as will be described later, it is not only useful as a pressure member or a conveying member (conveying belt or roller), but also for uses other than the image forming apparatus, for example, prevention of contamination, It can be used as a member that requires releasability, heat resistance, and the like.

  Here, examples of the organic magnetic material include a high spin organic molecular magnetic material, an organometallic complex magnetic material, and an organic heat-treated magnetic material. Any one selected from these organic magnetic materials or a combination thereof is preferable. The organic magnetic material will be specifically described below.

The organic magnetic material is classified as follows according to the magnetic manifestation state, and any of these magnetic materials such as a ferromagnetic material, an antiferromagnetic material, a superparamagnetic material, a paramagnetic material, and a spin glass may be used.
Examples of organic magnetic materials include black powdery polymers [Nature] produced by heating or irradiating 1,4-bis (2,2 ′, 6,6′-tetramethyl-1-oxyl) butyne. , 326, 370 (1987)], a black insoluble polymer obtained by polymerizing 1,3,5-triaminobenzene with iodine [Synth. Metal, 19, 709 (1987)], polycarbene (Journal of the Chemical Society of Japan, 1987, No. 4,595) and the like, but are not limited thereto.

High-spin organic molecular magnets are those that give parallel spins due to the inherent topological symmetry of organic molecules with π-conjugated systems, and those that give pure organic molecules spin, and are free on a monomer unit basis. It is a material having radicals / spin, and captures and suppresses radicals accompanying thermal degradation.
Examples include polycarbene, polyphenylacetylene, COPNA resin (condensed aromatic polycyclic compound resin) -based materials (high spin organic molecular magnetic material examples: Journal of Chemical Society of Japan, 595 (1987), J. Am. Chem. Soc. , 109, 1266 (1987), Abstracts of the 9th Conference on Fundamental Organic Chemistry P-60 (1988), Mol. Cryst, Liq. Cryst, 176, 125 (1987), The Chemical Society of Japan Spring, 142, 34 (1991) , The Chemical Society of Japan 57th 3D410-413 (1988), etc.) is not limited thereto.

An organometallic complex-based magnetic substance is an aggregate of organic complex compounds coordinated with a transition metal, in which transition metal ions are aligned in parallel by superexchange interaction via an organic molecule, and are roughly equal. By changing the valence of the metal in the molecular complex unit, thermal deterioration due to oxygen is suppressed.
Examples include decamethylferrocene / TCNQ charge transfer complex, oxide bisbenzoato complex, porphyrin complex, phthalocyanine complex-supported polymer, ferrocene complex-supported polymer, etc. (Example of organometallic complex-based magnetic substance: J. Am. Chem. Soc. 109, 769 (1987), J. Am. Chem. Soc. 108, 3143 (1986), JP-A-62-192383, Chem. Lett, 2331 (1987), etc.) are not limited thereto.

Organic heat-treated magnetic material is a heat-treated polymer or organometallic complex compound at a high temperature, and has a structure before carbonization, and a large amount of free radicals and transition metal ions are generated. Are interacting with each other, and have effects such as radical scavenging due to thermal degradation and suppression of oxidative degradation.
Examples include heat-treated products of polyacryl nitrile, heat-treated octacyanophthalocyanine compounds, heat-treated indanthrone, heat-treated adamantane, heat-treated products of the above-mentioned high spin organic molecular magnetic materials and organometallic complex magnetic materials (organic) Examples of heat-treated magnetic materials: Synth, Metals, 27. B615 (1988) IUPAC, CHEMRAWNVI, Tokyo, 1C05 (1987), Synth, Metals, 27, B625 (1988), Chem, Express, 5,597, 601, 605 (1990), JP-A-5 -114508) is not limited to these.

  That is, by using the magnetic material, it is possible to capture radicals associated with thermal degradation of the heat-resistant rubber material in the heating step and effectively suppress oxidative degradation. Therefore, a laminate having a good surface property can be obtained without causing cracks in the first layer (elastic layer) made of heat-resistant rubber and changing the surface hardness.

In the present invention, by containing an organic magnetic material in the second layer (primer layer), at least thermal degradation of the first layer (elastic layer) is suppressed. When used as a fixing member of a fixing device of the type, it is preferable that the organic magnetic material has a higher electron spin concentration.
That is, the spin concentration of the organic magnetic material measured by the electron spin resonance (ESR) method is preferably at least 1 × 10 ¹⁷ / g or more, more preferably 1 × 10 ¹⁸ / g or more. When the spin concentration is 1 × 10 ¹⁷ / g or more, there is a high possibility that ferromagnetism is exhibited, and the magnetic material is effective in concentrating the magnetic flux in the electromagnetic induction heating method. If the spin concentration is less than 1 × 10 ¹⁷ / g, the possibility of ferromagnetism becomes poor, and it becomes difficult to concentrate the magnetic flux in the electromagnetic induction heating method.

The laminate of the present invention is suitably used as a fixing member for fixing a toner image on a transfer body in an image forming process. The fixing member preferably has a roller shape or a belt shape.
The configuration of the fixing member in the present invention will be described below.
FIG. 2 is a schematic cross-sectional view illustrating a configuration example of a fixing member having a roller shape (a) and a belt shape (b).
In FIG. 2A, A is a fixing member (roller). The fixing member (roller) A is a first layer formed of a heat-resistant elastic body (rubber) such as heat-resistant synthetic rubber (hereinafter sometimes referred to as “heat-resistant synthetic rubber”) on the base A1. (Elastic layer) A2, second layer (primer layer) A3, and third layer (release layer made of fluorine-based resin) A4 are sequentially provided. The primer layer A3 contains an organic magnetic material.
In FIG. 2B, B is a fixing member (endless belt). The fixing member (endless belt) B includes a first layer (elastic layer) B2, a second layer (primer layer) B3, and a third layer (fluorine-based) made of heat-resistant synthetic rubber on the base B1. (Release layer composed of resin) B4 is sequentially provided. The primer layer B3 contains an organic magnetic material.
A silicone primer may be used to increase the adhesive strength between the base A1 and the elastic layer A2 or between the base B1 and the elastic layer B2.

  The fixing members shown in FIGS. 2A and 2B are each provided with an elastic layer A2 or B2 by coating the surface of the heat-resistant substrate A1 or B1 with the heat-resistant synthetic rubber, and coating the upper surface thereof. Thus, a primer layer A3 or B3 is provided, and a release layer A4 or B44 is provided by coating a fluororesin thereon.

As a method for producing the elastic layer, the surface of the substrate is modified with a silicone primer, and a heat-resistant synthetic rubber material is applied by spray coating, blade coating, dipping, etc., and then the rubber is vulcanized to form an elastic layer. it can.
As a method for preparing the primer layer, a primer dispersion mainly composed of a fluororesin (such as an aqueous fluororesin dispersion) can be applied in the same manner as the elastic layer and dried to form a primer layer.
Further, as a method for producing a release layer, a fluorine resin dispersion (water-based fluorine resin dispersion, etc.) is applied onto the primer layer on the elastic layer by spray coating, blade coating, dipping or the like in the same manner as the elastic layer. Alternatively, a fluororesin-based powder coating can be formed by electrostatic coating, fluid dipping, or a rotational lining method, and the fluororesin coating film can be baked to form a release layer.

As described above, when the primer layer A3 or B3 contains an organic magnetic material, the heat resistance at the interface between the elastic layer and the release layer is improved, and the heat resistance that constitutes the elastic layer due to the heat at the time of baking the fluororesin It is possible to further suppress the deterioration of the synthetic rubber and the decrease in the adhesive strength resulting therefrom.
That is, free radicals / spins related to the magnetic development of organic magnetic materials may cause thermal degradation of heat-resistant synthetic rubber, main chain breakage, side chain oxidation degradation, etc. It is presumed that the generated radicals are captured and damage to the heat-resistant synthetic rubber is suppressed. Therefore, it is considered that deterioration during firing is reduced, and even when the fixing device is operated at high temperature, interface deterioration is suppressed, and release layer peeling, elastic layer surface hardness change and cracks are suppressed.

The fixing member is provided in the fixing device of the image forming apparatus, and plays a role of fixing the toner image on the transfer body in the image forming process.
By using a roller-shaped or belt-shaped fixing member made of the laminate of the present invention, it is possible to achieve requirements such as oil-less toner releasability, flexibility, elasticity, image smear, image unevenness, A high quality image can be fixed without occurrence of gloss unevenness or defective image fixing. That is, the fixing performance and durability are excellent. Therefore, an image forming apparatus provided with the fixing device as a fixing unit always forms a stable and high-quality image.

Hereinafter, the image forming apparatus and the fixing device will be described with reference to the drawings. FIG. 3 is a schematic configuration diagram for explaining an electrophotographic image forming apparatus (for example, a copying machine or a laser printer) according to the present invention.
In FIG. 3, an image forming apparatus 100 includes a photosensitive drum 101 on which an electrostatic latent image is formed, a charging roller 102 that performs charging processing in contact with the photosensitive drum 101, an exposure unit 103 such as a laser beam, and a photosensitive drum. A developing roller 104 for attaching toner to the electrostatic latent image 101; a power pack 105 for applying a DC voltage to the charging roller 102; a transfer roller 106 for transferring the toner image on the photosensitive drum 101 to a recording paper 107; A cleaning device 108 for cleaning the photosensitive drum 101 after the transfer process, a surface potential meter 109 for measuring the surface potential of the photosensitive drum 101, and a fixing device 110 including a fixing roller 111 and a pressure roller 112 are configured. Yes.

In the image forming apparatus 100 using this electrophotographic system, the photosensitive layer of the rotating photosensitive drum 101 is uniformly charged using a charging roller 102 and then exposed by an exposure unit 103 such as a laser beam to cause electrostatic latent images. An image is formed, the electrostatic latent image is developed with toner to form a toner image, and the toner image is transferred onto the recording paper 107. Then, the recording paper 107 is passed through a fixing device 110 composed of a fixing roller 111 and a pressure roller 112, and the toner adhering to the recording paper 107 is pressurized while being softened by the heat of the fixing roller 111, thereby recording the recording paper. The toner image is configured to be fixed on 107.
As the fixing roller 111 in this case, a fixing member made of the laminate of the present invention is preferably used. In the configuration of FIG. 3, the fixing member has a so-called roller shape, but the fixing member may have a belt shape. The belt type fixing device will be described below.

FIG. 4 is a schematic configuration diagram for explaining a belt-type fixing device.
The fixing device 117 shown in FIG. 4 includes a heating roller 115, a fixing roller 114 arranged in parallel to the heating roller 115, and a fixing belt rotatably provided around the heating roller 115 and the fixing roller 114. 113 and a pressure roller 116 that presses against the fixing roller 114 via the belt 113 and forms a fixing nip portion with the belt 113. As the belt 113 in this case, a fixing member made of the laminate of the present invention is preferably used.

  A belt-type fixing device 117 as shown in FIG. 4 is attached to the recording paper 107 by passing the recording paper 107 between the fixing belt 113 heated by the heating roller 115 and the pressure roller 116. The toner is softened by the heat of the fixing belt 113 and is pressed by the pressure roller 116 to be fixed on the recording paper.

The fixing member composed of the laminate will be described in detail.
As shown in FIG. 1, the structure of the fixing member made of a laminate includes a base, an elastic layer made of heat-resistant rubber (heat-resistant synthetic rubber) as a first layer on the base, and a second layer, An adhesive resin mainly composed of a fluororesin that joins the first layer and the third layer, a primer layer containing an organic magnetic material, and a release layer made of a fluororesin as a third layer on the second layer. The mold layer is provided.
Hereinafter, the “first layer” may be expressed as “elastic layer”, the “second layer” as “primer layer”, and the “third layer” as “release layer”.

The primer layer constituting the fixing member in the embodiment of the present invention is not particularly limited as long as the primer layer has a fluororesin as a main component (a fluororesin primer).
Here, the fluororesin-based primer is made of a fluororesin having a functional group, and the type of material for forming the elastic layer, the properties of the surface thereof, and the release layer formed via the fluororesin-based primer (fluororesin, so-called It is appropriately selected depending on the type of top coat).

  The fluororesin-based primer preferably has a functional group in the structure having a structure similar to that of the fluororesin of the release layer coated thereon. By combining fluororesin systems having similar structures in this way, the compatibility between the fluororesin used for the fluororesin primer and the fluororesin coated thereon is improved. Thereby, not only the adhesiveness between the fluororesin primer layer and the surface of the elastic layer, but also the interlayer adhesive strength between the fluororesin primer layer and the release layer can be improved.

If the above fluororesin-based primer is used, even when used at high temperatures, for example, when using a primer made of another resin component, delamination or cracks due to differences in the thermal contraction rate of the polymer, etc. , Hard to cause pinholes.
In addition, even if the release layer is formed using a fluororesin that does not contain a functional group on the outermost surface of the coating film, it exhibits excellent heat resistance, chemical resistance, non-adhesiveness, and low friction properties more effectively. can do.
In addition, it is preferable that the layer thickness of a fluororesin type primer is 0.01-5 micrometers. If it deviates from this range, the adhesive strength may decrease, or cracks and cohesive failure may occur in the primer itself, and the desired performance may not be obtained.

  Moreover, the addition amount of the organic magnetic substance in the primer layer is 0.01 to 10 parts by weight, preferably 0.1 to 5 parts by weight with respect to 100 parts by weight of the fluororesin primer dispersion. If the addition amount of the organic magnetic material is less than 0.01 parts by weight, desired heat resistance may not be obtained, and the adhesive strength may be reduced or the rubber may be destroyed due to deterioration of the heat resistant synthetic rubber. On the other hand, if the amount exceeds 10 parts by weight, the primer layer may have poor film formability, and cracks and cohesive failure may occur in the primer layer.

As described above, when used as a fixing member of an electromagnetic induction heating type fixing device, the spin concentration of the organic magnetic material is 1 × 10 ¹⁷ / g or more, more preferably 1 × 10 ¹⁸ / g or more. Preferably there is. Such a spin concentration is particularly effective in concentrating the magnetic flux in the fixing belt when used in a heating method using electromagnetic induction as described in the present invention.
Note that the spin concentration is not limited to the spin concentration because the spin concentration is focused on magnetic flux concentration and is effective for preventing thermal deterioration of the heat-resistant rubber outside this spin concentration range. Therefore, even in the case of an electromagnetic induction type fixing belt as described in the present invention, an organic magnetic material outside the above spin concentration range is used as a primer additive material for the purpose of preventing thermal deterioration of the heat resistant rubber. There is no problem.

Furthermore, in addition to the organic magnetic material in the present invention, an inorganic magnetic material may be contained as necessary, and there is no problem, and it is more effective in concentrating the magnetic flux. In this case, examples of the inorganic magnetic material used in combination include a ferromagnetic material exhibiting ferromagnetism or ferrimagnetism.
Ferromagnetic materials include Fe, Ni, Co and alloys thereof, oxides such as CrO ₂ , and ferrimagnetic materials include spinel ferrites (MnFe ₂ O ₄ , Fe ₃ O ₄ , γ-Fe ₂ O ₃ , NiZnFe ₄ O ₈ , ZnFe ₂ O _{4 and the} like), garnet (Y ₃ Fe ₆ O _{12 and the} like), and the like.
In addition, as an addition method to the said primer dispersion liquid, it can disperse | distribute by general methods, such as an ultrasonic wave and a homogenizer.

  The heat-resistant rubber constituting the elastic layer A2 or B2 is preferably a heat-resistant synthetic rubber such as silicone rubber, fluorine rubber, or fluorosilicone rubber, but any heat-resistant rubber (so-called heat-resistant elastic body) can be used. In particular, it is not limited to these. In particular, when the heat-resistant synthetic rubber constituting the elastic layer A2 or B2 is a heat-resistant synthetic rubber such as silicone rubber, fluorine rubber, or fluorosilicone rubber, it has heat resistance at the fixing temperature (˜200 ° C.). Therefore, the flexibility of the surface of the fixing member is directly reflected on the surface layer, and a good fixed image quality can be obtained stably.

  Examples of the fluorine-based resin constituting the release layer A4 or B4 include tetrafluoroethylene-polyethylenefluorovinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), and poly Examples of the fluororesin selected from tetrafluoroethylene (PTFE), a mixture of these fluororesins, and those obtained by dispersing these fluororesins in a heat-resistant resin include these. It is not limited to. When the release layer A4 or B4 is made of a fluorine-based resin, the oil-less release property of the toner is expressed. In addition, if the release layer A4 or B4 in the present invention is thick, uneven glossiness is likely to occur. Therefore, it is preferable to set the thickness appropriately according to the layer configuration.

The base A1 in the heat fixing member A is preferably a roller made of a metal material such as aluminum, stainless steel, or brass.
Further, the base B1 in the heat fixing member B is an endless belt made of a metal material such as stainless steel or nickel, an endless belt made of a heat resistant resin material such as polyimide, polyamideimide, or fluorine resin, or these This is a laminated endless belt.
Although the fixing member has a roller shape and a belt shape (endless belt), the fixing member may have a sheet shape (including a laminated structure) made of the above materials according to the purpose and application. Absent.

EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated further more concretely, this invention is not limited by these Examples.
First, organic magnetic materials and fluorine resin-containing primers used in Examples and Comparative Examples were synthesized as follows.

[Synthesis Example 1]
Synthesis of organic magnetic materials (I) (High-spin organic molecular magnetic materials: COPNA resin-based materials)
After 20.2 g of pyrene and 10.6 g of benzaldehyde were sufficiently stirred and mixed, 5% by weight of p-toluenesulfonic acid was added, and the mixture was heated for 1 hour by azeotropic dehydration while stirring in an argon stream. The obtained solid was dissolved in chloroform and purified by reprecipitation in methanol to obtain 28.9 g (yield 93.9%) of compound (I) having a triarylmethane structure.

  Next, in order to carry out the photo-oxidation treatment of this compound, 200 mg of compound (I) was dissolved in 600 ml of chloroform / carbon tetrachloride = 1/1 (Vol / Vol) mixed solvent, and a high-pressure mercury lamp (UM-102 manufactured by Ushio Electric Co., Ltd.). ) For 5 hours. After light irradiation, the sample solution was purified by reprecipitation with methanol to obtain 192 mg (yield 96.0%) of a dehydrogenated product.

When this dehydrogenated product was evaluated by a water surface agglomeration method in which a petri dish was filled with water and a permanent magnet was placed under the petri dish, it immediately gathered at a place where the magnetic flux density was high. JEOL-JES-TE300 (manufactured by JEOL Ltd.) was measured. As a result, very broad and broad absorption was observed on the low magnetic field side, and it was confirmed to be a magnetic substance. Further, the spin concentration was determined to be 1.0 × 10 ¹⁸ spin / g.

[Synthesis Example 2]
Synthesis of organic magnets (II) (organometallic complex magnets: ferrocene polymer materials [ferrocene-cinnamic aldehyde condensation polymer])
200 g of ferrocene, 80 g of cinnamic aldehyde, 25.8 g of anhydrous ferric chloride and 150 ml of dimethylformamide were mixed and heated to 140 ° C. with stirring under a nitrogen stream. Next, 100 g of cinnamaldehyde dissolved in 375 ml of xylene was added dropwise over 1 hour. The water produced by the reaction with xylene distilled out of the system by azeotropy. Further, the temperature was raised to 150 ° C. and reacted for 2 hours. After completion of the reaction, the reaction mixture was allowed to cool to the chamber and the resulting resin was purified by filtration. As a result, 281 g (yield: 86.5%) of a brown resin was obtained.

10 g of this ferrocene polymer and 12.6 g of 2,3-dichloro-5,6-dicyano-p-benzoquinone were sufficiently dissolved in 1500 ml of dimethylformamide, and heated under reflux for 12 hours under an argon stream. Thereafter, the sample solution was purified by reprecipitation with methanol to obtain 7.3 g of magnetic substance (yield 73%).
When the magnetization characteristics of this resin were measured using a VSM (vibrating sample magnetometer), Is (saturated magnetization) = 0.09 emu / g and Hc (retention force) = 200 Oe were obtained. The spin concentration determined by ESR was 3.0 × 10 ¹⁸ / g.

[Synthesis Example 3]
Synthesis of organic magnetic materials (III) (organic heat-treated magnetic materials: heat-treated indantron materials)
10 g of Indantron (manufactured by Tokyo Chemical Industry Co., Ltd.) was subjected to a heat treatment at 500 ° C. at normal pressure for a predetermined time under a glass tube argon filled to obtain a heat-treated product of Indantron. When the magnetization characteristics were measured using a VSM (vibrating sample magnetometer), Is (saturation magnetization) = 0.25 emu / g and Hc (holding force) = 60 Oe were obtained. The spin concentration determined by ESR was 2.5 × 10 ¹⁸ / g.

[Synthesis Example 4]
Synthesis of primer dispersion (IV) (aqueous fluororesin dispersion)
A 3 liter glass-lined autoclave equipped with a stirrer, valve, pressure gauge, and thermometer was charged with 1500 ml of pure water and 9.0 g of ammonium perfluorooctanoate, thoroughly replaced with nitrogen gas, evacuated, and charged with 20 ml of ethane gas. . Next, as a fluorine-containing ethylenic monomer having a hydroxyl group, perfluoro- (1,1,9,9-tetrahydro-2,5-bistrifluoromethyl-3,6-dioxa-8-nonene-1- All) 3.8 g and perfluoro (propyl vinyl ether) 18 g were injected using nitrogen gas, and the temperature in the system was kept at 70 ° C. While stirring, tetrafluoroethylene gas was injected so that the internal pressure was 8.5 kgf / cm ² G. Next, a reaction in which 0.15 g of ammonium persulfate was dissolved in 5.0 g of water was injected with nitrogen to start the reaction.

Since the pressure decreased with the progress of the polymerization reaction, when the pressure decreased to 7.5 kgf / cm ² G, the pressure was increased again to 8.5 kgf / cm ² G with tetrafluoroethylene gas, and the pressure reduction and pressure increase were repeated. Every time about 40 g of tetrafluoroethylene gas is consumed from the start of polymerization while continuing to supply tetrafluoroethylene, 1.9 g of the fluorine-containing ethylenic monomer having a hydroxyl group is totaled 3 times (total of 5.7 g). The polymerization was continued by press-fitting. When about 160 g of tetrafluoroethylene was consumed from the start of the polymerization, the supply was stopped and the autoclave was cooled to release the unreacted monomer to obtain 1702 g of a bluish translucent aqueous fluororesin dispersion. It was. The solid content concentration of the fluororesin in the obtained aqueous fluororesin dispersion was 10.9% by weight, and the particle diameter measured by the dynamic light scattering method was 70.7 nm.

  Further, this aqueous fluororesin dispersion was concentrated with a surfactant to make the solid content concentration 15% by weight. 100 parts by weight of this aqueous fluororesin dispersion (solid concentration 15% by weight), 1.0 part by weight together with the amount of surfactant used during concentration, thickener: methylcellulose aqueous solution (methylcellulose 4.8% by weight) 4 0.0 part by weight was uniformly mixed and filtered through a SUS net (300 mesh) to obtain a primer dispersion.

Example 1
The laminated body of Example 1 was produced through the following steps in sequence.
<A-1> Step: A primer (manufactured by Toray Dow Corning Silicone Co., DY39-051) was applied on a 40 μm thick sheet-like stainless steel (SUS) substrate and dried to form a silicone primer layer.
<B-1> Step: A solution of heat-resistant silicone resin (manufactured by Toray Dow Corning Silicone Co., DY35-2083) is applied on the formed silicone primer layer to form a 300 μm coating layer, and the silicone rubber is heated to 120 ° C. After the primary vulcanization for × 15 minutes, an elastic layer was formed through secondary vulcanization at 200 ° C. for 4 hours.
<C-1> Step: On the formed elastic layer, 0.1 part by weight of the high-spin organic molecular magnetism synthesized in Synthesis Example 1 in the primer dispersion (aqueous fluororesin dispersion) synthesized in Synthesis Example 4 The primer in which the body (COPNA resin-based material) was dispersed was spray-coated to form a primer layer having a thickness of 2 μm.
<D-1> Step: On the formed primer layer, PFA (Mitsui / Du Pont Fluoro Chemical Co., Ltd., PFA340-J) is powder-coated to a film thickness of 20 μm to form a fluororesin coating layer. The coating layer was baked at 340 ° C. for 30 minutes to form a release layer.

(Example 2)
The organometallic complex-based magnetic material (ferrocene) synthesized in 0.1 part by weight of Synthesis Example 2 instead of 0.1 part by weight of the high-spin organic molecular magnetic material used in the step (c-1) of Example 1 A laminate of Example 2 was produced through the same steps as in Example 1 except that a primer in which a polymer material) was dispersed was used.

(Example 3)
Organic heat treated material-based magnetic material synthesized in 0.1 part by weight of Synthesis Example 3 (heat treatment) instead of 0.1 part by weight of the high-spin organic molecular magnetic material used in the step (c-1) of Example 1 A laminate of Example 3 was produced through the same steps as in Example 1 except that a primer in which the indanthrone material was dispersed was used.

(Comparative Example 1)
Primer of only the primer dispersion (aqueous fluororesin dispersion) synthesized in Synthesis Example 4 without containing 0.1 part by weight of the high spin organic molecular magnetic material used in the step (c-1) of Example 1 The laminated body of the comparative example 1 was produced sequentially through the process similar to Example 1 except having used.

Using the laminates of Examples 1 to 3 and Comparative Example 1 produced above, a peel test was performed under the following conditions to evaluate the adhesiveness. The results are shown in Table 1 below.
<Peel test method>
A 90-degree peel test was performed at a test width of 10 mm and a tensile speed of about 50 mm / min. Table 1 shows the peeling location where the elastic layer and the primer or between the rubber layer and the primer are marked with x, and the adhesive strength stronger than the breakage at the rubber layer is marked with ◯.

The peel strength between the layers in the laminates of Examples 1 to 3 was high, and the adhesive strength was such that it was broken by the rubber layer. No deterioration due to firing in the laminate formation process was observed.
On the other hand, it was observed that Comparative Example 1 was peeled between the primer layer and the rubber layer, and it was recognized that the adhesive strength was insufficient. From this, it is considered that the rubber layer was hardened and deteriorated by firing in the laminated body forming step and became very hard, and thus peeled off between the layer interfaces.

Example 4
The fixing roller of Example 4 was manufactured through the following steps.
<A-2> Step: A primer (Toray Dow Corning Silicone Co., DY39-051) was applied onto a cored bar made of aluminum having a diameter of 40 mm and dried to form a silicone primer layer.
<B-2> Step: On the formed silicone primer layer, a 250 μm coating layer of a heat-resistant silicone resin (manufactured by Toray Dow Corning Silicone Co., DY35-2083) solution is formed, and the silicone rubber is heated at 120 ° C. for 15 minutes. After the primary vulcanization, an elastic layer was formed through secondary vulcanization at 200 ° C. for 4 hours.
<C-2> Step: Organometallic complex-based magnetic material synthesized in Synthesis Example 2 in 0.1 part by weight on the primer dispersion (aqueous fluororesin dispersion) synthesized in Synthesis Example 4 on the formed elastic layer A primer in which (ferrocene polymer material) was dispersed was spray-coated to form a primer layer having a thickness of 2 μm.
<D-2> Step: On the formed primer layer, a PFA dispersion (manufactured by Mitsui DuPont Fluoro Chemical Co., PFA945HP-Plus) is spray-coated on the primer layer to form a coating layer having a thickness of 30 μm. This coating layer was baked at 340 ° C. for 30 minutes to form a release layer.

(Example 5)
Instead of the organometallic complex-based magnetic material (ferrocene polymer material) synthesized in Synthesis Example 2 of 0.1 part by weight used in the step (c-2) of Example 4, Synthesis Example 3 of 0.1 part by weight The fixing roller of Example 5 was manufactured through the same steps as in Example 4 except that the primer in which the organic heat-treated magnetic material (heat-treated indantron material) synthesized in (1) was dispersed was used.

(Comparative Example 2)
The primer dispersion (aqueous fluororesin disperse) synthesized in Synthesis Example 4 without containing 0.1 part by weight of the organometallic complex magnetic material (ferrocene polymer material) used in the step (c-2) of Example 4 The fixing roller of Comparative Example 2 was produced through the same steps as in Example 4 except that only the primer John) was used.

(Example 6)
The fixing belt of Example 6 was manufactured through the following steps.
<A-3> Process: Primer for silicone rubber (DY39-067, manufactured by Toray Dow Corning Co., Ltd.) is spray-coated on the surface of a polyimide resin seamless belt having a diameter of 60 mm, a width of 400 mm, and a thickness of 0.1 mm. A silicone primer layer was formed.
<B-3> Step: A 200 μm coating layer is formed on this silicone primer layer by spray-coating a toluene solution of heat-resistant silicone rubber (Toray Dow Corning, DY35-2083). After the primary vulcanization for × 15 minutes, an elastic layer was formed through secondary vulcanization at 200 ° C. for 4 hours.
<C-3> Step: Organometallic complex-based magnetic material synthesized in 0.1 part by weight of the primer dispersion (aqueous fluororesin dispersion) synthesized in Synthesis Example 4 on the formed elastic layer A primer in which (ferrocene polymer material) was dispersed was spray-coated to form a primer layer having a thickness of 2 μm.
<D-3> On this fluororesin-containing primer layer, a PFA dispersion (PFA945HP-Plus, manufactured by Mitsui DuPont Fluoro Chemical Co., Ltd.) is spray-coated to form a coating layer having a thickness of 30 μm. A release layer was formed by baking at a temperature of 30 ° C. for 30 minutes.

(Example 7)
Instead of the organometallic complex-based magnetic material (ferrocene polymer material) synthesized in 0.1 part by weight of synthesis example 2 used in step (c-3) of Example 6, 0.1 part by weight of synthesis example 3 A fixing belt of Example 7 was manufactured through the same steps as in Example 6 except that the primer in which the organic heat-treated magnetic material (heat-treated indantron material) synthesized in Step 1 was dispersed was used.

(Comparative Example 3)
The primer dispersion (aqueous fluororesin disperse) synthesized in Synthesis Example 4 without containing 0.1 part by weight of the organometallic complex magnetic material (ferrocene polymer material) used in the step (c-3) of Example 6 The fixing belt of Comparative Example 3 was produced through the same steps as in Example 6 except that only the primer John) was used.

  Examples of other PFA fluororesins in Examples and Comparative Examples include PFA940HP-puls (manufactured by Mitsui DuPont Fluorochemical Co.), PFA440HP-J (manufactured by Mitsui DuPont Fluorochemical Co., Ltd.), PFA441HP-J (Mitsui DuPont). Fluorochemical Co., Ltd.), PFA940HP-puls (Mitsui / DuPont Fluorochemical Co.), PFA950HP-puls (Mitsui / DuPont Fluorochemical Co., Ltd.) and the like can also be used.

The following evaluation was performed on the fixing members (fixing roller and fixing belt) manufactured in Examples 4 to 7 and Comparative Examples 2 and 3 prepared above.
“Appearance after member fabrication” was visually observed. Next, copying is performed using each fixing member, and when the number of copies reaches “1”, “100,000” and “200,000”, the “image quality (solid)” is observed and fixed. The “appearance after copying” on the surface of the member (fixing roller and fixing belt) was visually checked for the presence or absence of an abnormality, and evaluated according to the following evaluation criteria. The evaluation results are shown in Table 2 below.

<Evaluation criteria by visual observation>
○: Level that does not cause a problem in practical use Δ: Level at which slight anomaly or deterioration is recognized ×: Level at which anomalous anomaly or deterioration is recognized The term “deterioration of image quality” here means yuzu skin or uneven gloss. This is due to the deterioration of the elastic layer of the fixing member, thereby losing the smoothness of the surface of the member or the non-uniform pressure during fixing.

  In Examples 4 to 7, there was no particular abnormality in the image quality and the fixing belt even after copying of 100,000 sheets and 200,000 sheets after the preparation of the fixing member (one sheet). On the other hand, in Comparative Examples 2 and 3, when the copying of 100,000 sheets was completed, some cracks were observed on the surface of the fixing belt and the image quality was deteriorated due to the hardening deterioration of the elastic layer, but the parts were not damaged. The evaluation was continued. However, when 200,000 copies were completed, the image quality was remarkably deteriorated, and when the fixing belt was observed, cracks were generated and grew, and the image was deteriorated and broken to a level that did not function satisfactorily as a fixing member. In the case where a crack occurs, toner remains in the cracked portion, so that problems such as image fouling and defective image fixing due to surface unevenness may occur.

(Example 8)
An image forming apparatus was configured by incorporating a fixing device including a fixing member made of the laminate of the present invention.
FIG. 5 is a schematic configuration diagram showing an example of an image forming apparatus incorporating the fixing device according to the present invention.
In the figure, 1 is an image carrier, 2 is a charging means, 3 is a laser writing unit, 4 is a developing device, 5 is a transfer roller, and 6 is a cleaning device. In the figure, reference numeral 7 denotes a paper feed unit, 8 denotes a paper feed roller, 9 denotes a registration roller pair, 10 denotes a fixing device, 11 denotes a paper discharge unit, and 12 denotes an image forming apparatus main body. The fixing belt of the fixing device 10 has a belt configuration as in Examples 6 and 7, for example.
The image carrier 1 is rotationally driven in the direction of the arrow in the figure by a driving means (not shown), and the surface thereof is uniformly charged by the charging means 2, and then a latent image is formed on the surface by exposure from the laser writing unit 3. The latent image is visualized by the developing device 4, and the toner image is transferred by the transfer roller 5 to a transfer body P such as paper supplied from the paper supply unit 7 via the paper supply roller 8 and the registration roller pair 9. . The toner remaining on the surface of the image carrier 1 after the transfer of the toner image is removed by the cleaning device 6. The transfer body P to which the image has been transferred is introduced into the fixing device 10, the toner image is fixed to the transfer body P by heating and pressurization, and then discharged to the paper discharge unit 11.
As a result of copying using the image forming apparatus having the above-described configuration, a high-quality image having no image smear, image unevenness, gloss unevenness, image fixing failure, or the like was formed even without oil. The image forming apparatus of the present invention is not limited to the configuration shown in FIG.

Example 9
The fixing member made of the laminate of the present invention was arranged to constitute an electromagnetic induction heating type fixing device.
FIG. 6 is a schematic view showing a configuration example (A) of an electromagnetic induction heating type fixing device according to the present invention and an enlarged cross section (B) of the fixing belt.
The fixing device includes a heating roller 21 that is heated by electromagnetic induction of the induction heating unit 20, a heating roller 21 that is arranged so that its axis is parallel to the fixing roller 22, and the heating roller 21 and the fixing roller 22. The fixing member (fixing belt) 23 formed of the endless laminate of the present invention, and the pressure roller 24 that rotates in pressure contact with the fixing roller 22 via the fixing belt 23.

  The induction heating means 20 heats the heating roller 21 by electromagnetic induction, and includes an excitation coil 25 that is a magnetic field generation means, a coil guide plate 26 around which the excitation coil 25 is wound, a ferrite disposed outside the excitation coil 25, and the like. This is composed of a semi-cylindrical excitation coil core 27 made of a ferromagnetic material and an excitation coil core support member 28 for fixing and supporting the excitation coil core 27. The exciting coil 25 is connected to a driving power source (not shown).

  The coil guide plate 26 has a semi-cylindrical shape arranged close to the outer peripheral surface of the heating roller 21, and the excitation coil 25 is a schematic cross-sectional view showing the configuration of the induction heating means in the fixing device of FIG. As shown in the cross-sectional view (A), the main part side view (B), and the main part enlarged cross-sectional view (C)), an exciting coil wire is alternately arranged along the coil guide plate 26 in the axial direction of the heating roller 21. 7C, a magnetic field E is generated in a direction perpendicular to the axis of the coil, and the heating roller 21 is heated by electromagnetic induction, as shown in FIG. Hollow cylindrical non-heat-generating materials made of heat-resistant materials, heat insulating materials in which balloons (hollow bodies) such as phenolic resin and glass are dispersed and mixed in super engineering plastics, silica, and other materials with low thermal conductivity 30, made of heat generating material layer 31 provided on the side (the contact surface of the fixing belt 23) the outer peripheral surface thereof.

  Since the hollow cylindrical non-heating element 30 also serves as a support as the heating roller 21, the hollow cylindrical non-heating element 30 has a required rigidity as a support, such as 0.3 mm or 0.4 mm. On the other hand, the heat-generating material layer 31 is formed by forming a heat-generating material such as SUS430 or nickel on the non-heat generating body 30 in a thickness of about 1 to 10 μm by vapor deposition or the like.

  In FIG. 6, the fixing roller 22 is formed by coating a metal core such as stainless steel with a heat-resistant silicone rubber in a solid or foamed form. For example, the pressure roller 24 is configured by providing an elastic member having heat resistance and high toner releasability on the surface of a cored bar made of a metal cylindrical member having high thermal conductivity such as copper or aluminum. The fixing roller 22 and the pressure roller 24 are pressed against each other via the fixing belt 23, and the transfer body P and the toner T thereon are fixed by heating and pressing.

The fixing belt 23 shown in the enlarged schematic view of the main part in FIG. 6B (partial enlarged sectional view showing the structure 23 in FIG. 6A) has good thermal conductivity and is not easily deformed such as deflection. In the present invention, the fixing belt 23 does not require heat generation due to electromagnetic induction, and the same fixing belt as in the sixth and seventh embodiments can be used.
That is, the fixing belt 23 sequentially has an elastic layer 23b made of a heat-resistant synthetic rubber, a primer layer 23c, and a release layer 23d made of a fluororesin on the base 23a. The primer layer 23c is configured to contain an organic magnetic material, and the magnetic field E generated by the excitation coil 25 is easily concentrated, so that the magnetic flux can be concentrated on the heat generating material layer 31, and the excitation coil 25 And the non-heat generating body 30 are less likely to leak from the gap, and the heatability can be improved.

The organic magnetic substance contained in the primer layer 23c has a spin concentration of at least 1 × 10 ¹⁷ / g or more, and the organic magnetic substance having such a spin concentration is highly likely to exhibit ferromagnetism. Therefore, it becomes a magnetic material that is particularly effective for enabling concentration of magnetic flux, and a synergistic effect in combination with improved heat resistance appears. In the figure, reference numeral 40 denotes a temperature sensor arranged inside the fixing belt 23 so that the temperature of the fixing belt 23 can be detected.

With such a configuration, the exciting coil 25 is fed with a high-frequency alternating current from a drive power source to generate a magnetic field E, and the heat generating material layer 31 of the heating roller 21 is heated by electromagnetic induction. The fixing belt 23 receives heat conduction from the heat generating material layer 31 by contact with the heating roller 21, and the heat generating material layer 31 is continuously heated over the whole by the rotation of the heating roller 21 and the fixing roller 22. To do. At this time, heat transfer from the heat-generating material layer 31 to the hollow interior is substantially blocked by the non-heat-generating body 30 having thermal insulation or low thermal conductivity, and is efficiently transferred to the fixing belt 23.
As a result of copying using an image forming apparatus equipped with an electromagnetic induction heating type fixing device having the above configuration, there is no delamination of the fixing belt, generation of cracks, change in surface hardness, etc., as well as improvement in initial characteristics and durability over time A high-quality image was formed that was excellent in image quality and free from image unevenness, gloss unevenness, image fixing failure, and the like. The fixing device of the present invention is not limited to the configuration shown in FIGS.

  As described above, when the laminate of the present invention is used, the second layer (the fluororesin-based primer layer having a functional group) contains the organic magnetic material, so that the first layer is not adversely affected. The adhesion member with the interface of the third layer (release layer) can be improved while forming the layer (elastic layer), so that a fixing member excellent in heat resistance, non-adhesiveness and flexibility can be obtained. . If such a fixing member is provided in the image apparatus, it is possible to prevent the occurrence of defects such as image contamination due to cracking of the elastic layer due to deterioration of the heat-resistant synthetic rubber and image fixing failure due to surface nonuniformity. In addition, when used as a non-heat-generating fixing belt of the electromagnetic induction heating and fixing system, the effect of reducing the influence from the gap with the exciting coil and the effect of concentrating the magnetic flux can be obtained, and electromagnetic induction that provides a good heat generation effect A heat fixing device and an image forming apparatus can be provided.

It is a schematic sectional drawing which shows the structural example of the laminated body in this invention. It is a schematic sectional drawing which shows the structural example of the fixing member of roller shape (a) and belt shape (b) in this invention. 1 is a schematic configuration diagram for explaining an electrophotographic image forming apparatus according to the present invention. 1 is a schematic configuration diagram for explaining a belt-type fixing device according to the present invention. 1 is a schematic configuration diagram showing an example of an image forming apparatus incorporating a fixing device according to the present invention. FIG. 2 is a schematic diagram illustrating a configuration example (A) of an electromagnetic induction heating type fixing device and an enlarged cross section (B) of a fixing belt in the present invention. FIG. 7 is a schematic cross-sectional view (main part cross-sectional view (A), main part side view (B), main part enlarged cross-sectional view (C)) showing a configuration of induction heating means in the fixing device of FIG. 6.

Explanation of symbols

A Fixing member (roller)
B Fixing member (endless belt)
A1, B1 substrate A2, B2 first layer (elastic layer)
A3, B3 Second layer (primer layer)
A4, B4 3rd layer (release layer)
DESCRIPTION OF SYMBOLS 1 Image carrier 2 Charging means 3 Laser writing unit 4 Developing device 5 Transfer roller 6 Cleaning device 7 Paper feed unit 8 Paper feed roller 9 Registration roller pair 10 Fixing device 11 Paper discharge unit 12 Image forming apparatus main body 20 Induction heating means 21 Heating Roller 22 Fixing roller 23 Fixing belt 23a Base 23b Elastic layer 23c Primer layer 23d Release layer 24 Pressure roller 25 Excitation coil 26 Coil guide plate 27 Excitation coil core 28 Excitation coil core support member 30 Non-heating element 31 Heating material layer 40 Temperature sensor P Transfer body T Toner 50 Laminate body 51 Base 52 First layer (elastic layer)
53 Second layer (primer layer)
54 Third layer (release layer)

Claims (6)

In a laminate in which a first layer made of heat-resistant rubber, a second layer made of an adhesive resin mainly composed of a fluororesin, and a third layer made of a fluororesin are sequentially provided on a substrate,
The laminated body, wherein the second layer contains at least an organic magnetic material.   2. The organic magnetic material according to claim 1, wherein the organic magnetic material is one selected from a high spin organic molecular magnetic material, an organometallic complex magnetic material, or an organic heat-treated magnetic material, or a combination thereof. The laminated body of description. A fixing member having a roller shape or a belt shape for fixing a toner image on a transfer body in an image forming process,
The fixing member comprising the laminate according to claim 1 or 2. A fixing device including a fixing member for fixing a toner image on a transfer body in an image forming process,
A fixing device comprising the fixing member according to claim 3. A heating roller that generates heat by electromagnetic induction heating;
A fixing roller arranged in parallel with the heating roller;
A belt that is non-exothermic to electromagnetic induction heating that is wound around the heating roller and the fixing roller;
A pressure roller that presses the fixing roller through the belt and forms a fixing nip portion with the belt;
Heating means for heating the heating roller from its outer peripheral side by electromagnetic induction;
A fixing device comprising:
The fixing device according to claim 1, wherein the belt is a belt made of the laminate according to claim 1. An image forming apparatus having at least an image carrier, a charging unit, an electrostatic latent image forming unit, a developing unit, a transfer unit, a fixing unit, a charge eliminating unit, and a cleaning,
6. The image forming apparatus according to claim 4, wherein the fixing unit includes the fixing device according to claim 4.

Images