JP2000242115A - Image recorder and fixing device used in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make favorably retainable fixing performance at all times in an oilless system independently of the kind of recording material (paper stock, OHP or the like). SOLUTION: The image recorder has a toner image forming device 3 which forms an unfixed toner image 2 on a recording material 1 and a fixing device 4 which has a pair of fixing members 4a, 4b which nip the recording material 1 and fixes the unfixed toner image 2 carried on the recording material 1. A toner T used in the toner image forming device 3 contains a wax. The surface of the fixing member 4a brought into contact with the unfixed toner image 2 on the recording material 1 has a releasing layer 5 comprising fluororubber having a great affinity for the wax or a releasing layer 6 comprising an oil- repellent fluororubber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image recording apparatus of the type in which an unfixed toner image on a recording material is fixed by a fixing device and a fixing device used in the image recording device. The present invention relates to an image recording apparatus that is effective in a mode in which a supply device is not provided, and an improvement of a fixing device used for the image recording apparatus.
The image recording apparatus referred to here includes various aspects such as an electrophotographic recording apparatus, an electrostatic recording apparatus, ionography, and an apparatus for forming an image using a magnetic latent image.

[0002]

2. Description of the Related Art Conventionally, as an image recording apparatus for reproducing an image signal on a recording material such as paper, a latent image is formed on a latent image carrier such as a photosensitive drum and toner is selectively adhered to the latent image. The toner image is directly transferred to a recording material, or the toner image is temporarily transferred to an intermediate transfer member,
After that, various types such as a mode of transferring to a recording material have already been put to practical use. In this type of image recording apparatus, a fixing device for fixing a toner image on a recording material is usually provided, and the fixing device includes, for example, a heat fixing roll having a built-in heater as a heating source, and the like. A pressure-fixing roll that is arranged in pressure contact with the heat-fixing roll and rolls, the recording material is nip-conveyed between the two fixing rolls, and the unfixed toner image is heated-press-fixed on the paper. Things are known. In addition, regarding the configuration of the fixing device, for example, a heat fixing belt is used instead of the heat fixing roll, a heating source is also provided on the pressure fixing roll side, an external heating source is added, or There are various types such as pressure fixing without using a heating source.

In the nip area between the fixing rolls, the toner image is softened and crushed by heat or pressure. However, since the softened toner image generally has adhesiveness, the side in contact with the toner image is hardened. , The toner is likely to adhere to the surface of the fixing member, for example, the surface of the heat fixing roll. Under such circumstances, the surface of the heat-fixing roll is usually covered with a non-adhesive coating layer so that the toner hardly adheres. Here, as a material of the non-adhesive coating layer, a fluororesin (see US Pat. No. 3,268,351), a dimethyl silicone rubber (see US Pat. No. 3,666,247, JP-A-52-46819) and a phenyl silicone rubber (JP-A-52-46819) are used. 59-209129), fluorosilicone rubber (see JP-A-3-26947), and fluororubber (see JP-A-55-135876) have been proposed, some of which have been put to practical use. I have.

[0004]

However, none of these non-adhesive coating layer materials have sufficient non-adhesiveness to the toner for dry development, so that a toner releasing agent such as silicone oil always remains on the fixing roll surface. Therefore, the use of a so-called oil phase method in which the oil is supplied is inevitable. In this type of oil phase method, the fluororesin coating generally shows good non-adhesiveness, but has poor wettability with silicone oil and is hard and has poor rubber elasticity, so that an unnecessary gloss is formed on the image forming surface of the recording material. There is a problem of giving. In addition, the dimethyl silicone coating absorbs silicone oil when heated and swells, possibly leading to destruction. Further, although the phenyl silicone rubber coating has improved silicone oil resistance, it has a problem of non-adhesion to toner. Furthermore, fluorosilicone rubber coatings have sufficient silicone oil resistance, but are inferior in heat resistance and physical strength, and have a maximum operating temperature of about 180 ° C, which is required for current high-speed copying machines. Cannot withstand the surface temperature of the fixing roll of 230 ° C.

On the other hand, fluororubber coatings are commonly used.
It withstands a temperature of 0 ° C. and is not attacked by thermal silicone oil at all, but requires a large amount of silicone oil due to poor non-stickiness. Therefore, in order to improve the affinity between the fluororubber and the silicone oil, a method of mixing and dispersing the modified silicone oil in the fluororubber (for example,
Japanese Patent Application Laid-Open No. 6-285934), a method in which a fluororubber roll is molded and then post-treated with a modified silicone oil.
175532) and the like. However, in the products of these methods, the affinity of the silicone oil to the fixing roll is rapidly lost because the functional groups such as the amino-modified silicone oil, the mercapto-modified silicone oil, and the carboxyl-modified silicone oil used decompose. In addition, blending of fluorine rubber and silicone rubber has been attempted, but there is a drawback in workability, and copolymer type blends of fluorine rubber and silicone rubber are difficult to disperse and have not yet been put to practical use.

Further, as disclosed in Japanese Patent Application Laid-Open No. Hei 8-211773, a fluororubber has been proposed in which a vulcanized silane-modified fluororubber is mixed and wetted with silicone oil. However, when the coating was performed so that 20 μl of the amino-modified silicone oil was applied per A4 size sheet, partial swelling occurred, and when the sheet as the recording material was discharged, the portion coated with the fluorine rubber was changed to the recording material. The recording material became rib-like wrinkles.

On the other hand, since a fluororubber molded article has almost no oil repellency as described later, it has poor oil resistance to certain types of oil and does not show sufficient durability. Therefore, attempts have been made to impart oil repellency to a fluororubber molded article in order to improve durability, and various methods have been proposed. These methods are roughly classified into 1) a method of modifying the surface of a fluororubber molded article, and 2) a method of modifying the composition of the fluororubber molded article. Method 1) includes treatment with fluorine gas, treatment with a chemical reactive with fluororubber, and, as a more general method, fluororesin (polytetrafluoroethylene resin, tetrafluoroethylene resin depending on the temperature conditions at the time of use). (E.g., selected from ethylene fluoride = perfluorovinyl ether copolymer resin, ethylene tetrafluoride = propylene hexafluoride copolymer resin). As the method 2), generally, a powder of the above-mentioned fluororesin is blended with a fluororubber. Also,
Irradiation treatment with high energy radiation of 10 to 30 Mrad is also performed.

However, the surface-treated fluororubber molded product loses oil repellency due to the destruction or peeling of the surface layer due to repeated loads (compression, friction, elongation, etc.) received during use. On the other hand, a molded article from a composition containing only a fluororesin powder does not lose oil repellency during use, but has a decrease in rubber strength and physical properties, particularly a remarkable decrease in elongation. Is not a satisfactory modification method.

Therefore, it has been proposed to add a low-molecular fluororesin to fluororubber as disclosed in, for example, JP-A-7-247396. However, since the surface is charged, the paper dust is adsorbed when the paper as the recording material is discharged, the peelability is reduced, and the offset occurs.

The method using oil application is extremely effective in preventing toner offset, but requires a device for supplying an anti-offset liquid (such as silicone oil), which complicates the fixing device. It has technical issues such as As a recording material on which a toner image is fixed by using these fixing devices, various types of paper, coated paper, plastic film, and the like are generally used. In particular, the necessity of a transparency film (OHP) using an overhead projector for presentation has recently attracted attention. In particular, O
In HP, unlike paper, the oil absorption capacity is low, and thus the currently obtained OHP is inevitably greasy due to oil application, and a large problem remains in the quality of the obtained image.

Therefore, in the fixing device, instead of the oil phase method, a silicone oil supply device or the like is not used, but instead, an anti-offset liquid (release agent) is supplied from the toner at the time of fixing. A so-called oilless system has been proposed. As this type of oilless system, for example, low molecular weight polyethylene in the toner,
A method of adding a release agent such as low molecular weight polypropylene has been proposed. However, if such additives are added in a large amount in order to obtain a sufficient effect, filming of the latent image carrier on the photoreceptor and contamination of the surface of the toner carrier such as a carrier and a sleeve may deteriorate the image. And it becomes a problem in practice.
Therefore, a small amount of release agent is added to the toner to the extent that the image is not deteriorated, and a small amount of release oil is supplied, or a roll-off member such as a web or a cleaning pad for the offset toner is used. It has been practiced to use a cleaning device in combination.

However, particularly in the field of full color, the means for containing a release agent as in the prior art, when using OHP as a recording material, causes high crystallization of the release agent and a difference in refractive index from the resin. Therefore, there is a technical problem that the transparency and haze (cloudiness) of the image after fixing are slightly reduced.

It is known that a wax is contained in a toner as a release agent. For example,
The technology is disclosed in JP-A-3304, JP-B-52-3305, JP-A-57-52574 and the like. Also, JP-A-3-50559 and JP-A-2-7986
0, JP-A-1-109359, JP-A-62
JP-A-14166, JP-A-61-273554, JP-A-61-94062, JP-A-61-13
No. 8259, JP-A-60-252361, JP-A-60-252360, JP-A-60-2173
No. 66 discloses a technique for containing waxes. Waxes are used to improve the anti-offset properties of toner at low and high temperatures and to improve the fixability at low temperatures. In the case of a conventional toner in which the developing property deteriorates when exposed to heat due to a rise in temperature, or when the toner is left for a long period of time, the wax migrates to the toner surface and the developing property deteriorates. Nothing was satisfactory and some problems had arisen.

For example, high-temperature offset and developability are excellent, but low-temperature fixability is just one step away, or low-temperature offset and low-temperature fixability are excellent, but blocking resistance is slightly inferior, and such as a copier. There have been adverse effects such as a decrease in developability due to an increase in the temperature inside the machine, an inability to achieve offset resistance at low and high temperatures, and an extremely poor OHP transparency. In particular, regarding the transparency of OHP, a proposal is made to add a crystallization nucleating agent or the like to wax in order to reduce crystallization of the wax itself (Japanese Patent Laid-Open No. 4-149559,
Japanese Patent Application Laid-Open No. 4-107467, and a proposal using a wax having a low crystallinity (Japanese Patent Application Laid-Open No. 3-9).
1108, JP-A-3-242397)
Also, a proposal has been made to improve the surface smoothness of a toner layer after fixing by adding a substance having good compatibility with a binder and a lower melt viscosity than the binder to the binder (see JP-A-3-212652). ) And so on. One of the release agents having relatively good transparency and low-temperature fixing performance is montan wax, which is a mineral wax. However, these are all O
It is not fully satisfactory in terms of HP transparency and haze.

On the other hand, in order to inhibit the crystallinity of the release agent itself, a proposal has been made to use an ester wax in which the structural symmetry of the release agent itself is broken (Japanese Patent Laid-Open No. 5-11851).
7, JP-A-5-126180, JP-A-5-126180
126181), and quite good results have been obtained. Also, Japanese Patent Application Laid-Open No. 9-319143.
As disclosed in Japanese Patent Application Publication No. JP-A-2005-115, a step of dissolving and dispersing a binder resin, a colorant and a release agent having an acid value of 20 mg / g or less in an oily medium to obtain an oily dispersion mixture, A step of forming oil droplets by dispersing in an aqueous medium, and a step of forming toner particles by removing the oil medium from the oil droplets, wherein the exposed amount of the release agent on the surface is 0 to 1%. Toner particles have been proposed.

However, even in recent full-color fixing devices, high durability and high reliability have been demanded.
For example, as can be seen in the image forming method of Japanese Patent Application Laid-Open No. Hei 10-91028, a high image area image can be reduced to a low image area image only by improving the binder resin and release agent of the toner without improving the fixing device. It is difficult to stably realize an image forming method applicable to full-color OHP over a long period of time, and further improvement is desired.

When a toner (for example, a wax-containing toner) which does not need to be coated with a releasing oil is used, only a portion where the toner is present is used as a releasing agent for a pressing member (a heat fixing roll or the like). Since a functional wax is not supplied, for example, when paper is used as a recording material, paper powder is likely to adhere to the pressing member. The paper as the recording material is transported in the recording material transport path from the paper supply unit to the transfer unit and further to the fixing unit. The recording material surface and the paper supply roll and the recording material transport roll in the recording material transport path are used. Paper dust is generated on the recording material due to frictional contact with the recording material or frictional contact with a guide member forming a recording material conveyance path. In particular, a large amount of paper dust is generated due to frictional contact between the paper surface as a recording material with a large friction and a paper feed roll. Therefore, a large amount of paper dust adheres to the pressing member, and the apparent releasability of the pressing member is reduced.

As described above, there has already been proposed a method in which a small amount of release oil is supplied, and at the same time, an offset toner is used in combination with a take-up type member such as a web or a cleaning pad. According to this method, paper dust can be removed, but paper dust may accumulate in a corresponding portion of the press-contact member and act as an abrasive to damage the press-contact member. In order to avoid this, it is conceivable to send the web before the paper dust accumulates and always maintain a new surface.However, the accumulated amount of paper dust is not effective, and the web feed amount is increased. This leads to a significant increase in running costs. If the paper dust cannot be removed, the paper dust accumulates on the surface of the press-contact member, and the apparent releasability remarkably deteriorates, thereby causing a so-called offset phenomenon that causes the toner to adhere. On the other hand, a method has been proposed in which the surface of the press-contact member is made robust and positively polished. However, it is difficult to perform polishing uniformly, and the press-contact member may be damaged unevenly.

The present invention has been made in order to solve the above technical problems. In a so-called oilless system, the fixing performance can be improved without being affected by the type of recording material (paper, OHP, etc.). An object of the present invention is to provide an image recording apparatus which can always be kept in a good condition and a fixing device used for the image recording apparatus. More specifically, the present invention provides a high-quality full-color OHP that is excellent in low-temperature fixability to a recording material and anti-offset properties over a long period of time, reliably secures fixability by a so-called oilless method, and has excellent transparency. It is an object of the present invention to provide an image recording apparatus capable of effectively preventing various adverse effects due to accumulation of paper dust, and a fixing device used therein.

[0020]

That is, according to a first aspect of the present invention, as shown in FIG. 1, a toner image forming apparatus 3 for forming an unfixed toner image 2 on a recording material 1; A fixing device 4 for fixing an unfixed toner image 2 carried on a recording material 1 and a fixing device 4 having a pair of fixing members 4a and 4b The toner T to be removed is a toner containing wax, and the unfixed toner image 2 on the recording material 1 in the fixing device 4
The surface of the fixing member 4a on the side in contact with the surface is provided with a release layer 5 made of fluorine rubber having a high affinity for wax.

According to this embodiment, the release layer 5 of the fixing member 4a always stores the wax supplied from the toner T,
OH as the recording material 1 to absorb excess wax
In addition to preventing contamination of P, the releasability is ensured by the absorbed wax to prevent paper dust from adhering to the paper as the recording material 1, and the next coming recording material 1 is brought with the offset paper dust. be able to.

In a second embodiment of the present invention, as shown in FIG. 1, a toner image forming apparatus 3 for forming an unfixed toner image 2 on a recording material 1 and a pair of fixing devices for nipping the recording material 1 In an image recording apparatus having members 4a and 4b and a fixing device 4 for fixing the unfixed toner image 2 carried on the recording material 1, the toner T used in the toner image forming device is made of wax. Contained in the fixing device 4
The surface of the fixing member 4a on the side of the recording material 1 which contacts the unfixed toner image 2 is provided with a release layer 6 made of oil-repellent fluoro rubber.

According to this aspect, since the release layer 6 of the fixing member 4a repels the wax supplied from the toner T, a uniform wax coating layer is formed on the surface of the release layer 6. At this time, since the wax is divided into the release layer 6 and the OHP side as the recording material 1 and adheres uniformly to the release layer 6, the OHP is uniformly peeled off, and the OHP stains due to wax unevenness at the time of peeling. To prevent
The releasability is ensured by the coating layer of the wax, so that the paper dust of the paper as the recording material 1 is prevented from adhering, and the next coming recording material 1 can carry the offset paper dust.

In such a technical means, if the toner image forming device 3 forms the toner image 2 on the recording material 1, the electrostatic latent image is formed on a latent image carrier such as a photosensitive member or a dielectric. An image may be formed, the image may be visualized with a toner T by a developing device, and the image may be transferred to the recording material 1 directly or via an intermediate transfer member. In this case, the toner image 2 includes not only a single color but also a full color. As for the fixing device 4, as long as it has a pair of fixing members 4 a and 4 b for nipping the recording material 1, the specific mode of the fixing members 4 a and 4 b is not limited to a roll shape or a belt shape. As for the fixing method, a heat fixing method (usually, pressure also acts),
It is acceptable to select the pressure fixing method as appropriate.
The heating source used in the heat fixing method may be appropriately selected from a heater, an electromagnetic induction heating device, and the like.

The toner T used in the toner image forming apparatus 3 may be a wax-containing toner, and usually includes a binder resin, a colorant and a wax as a release agent. Here, for example, to give an example of a method for producing an electrophotographic toner, a step of dissolving and dispersing a binder resin, a colorant, and a release agent in an oily medium to obtain an oily dispersion mixture; Phase) in an aqueous medium (aqueous phase) to form oil droplets, and a step in which the oil medium is removed from the oil droplets to form toner particles. Can provide toner particles having a surface release amount of the release agent of 0 to 1%. Here, it is preferable that the binder resin contains a polyester resin. Further, it is preferable that the release agent is dispersed in the oil medium in the form of fine particles in advance, and then mixed with the binder resin and the colorant. Further, in an embodiment in which an electrophotographic method or the like is employed as the toner image forming device 3, the electrostatic latent image on the latent image carrier is developed using the developer layer on the developer carrier of the developing device. Then, the formed toner image is transferred and fixed onto the recording material 1, but only the toner T may be used as a developer in this case.
Alternatively, a two-component developer including the toner T and a carrier having a resin coating layer on a core material may be used.

In the first embodiment of the present invention, the fluorine rubber used in the release layer 5 of the fixing member 4a includes:
Although it may be appropriately selected, it is preferably a single product or a mixture of vulcanized silane-modified fluororubber. Further, from the viewpoint of further improving the releasability, the fluororubber used in the release layer 5 of the fixing member 4a is impregnated with a releasable oil or used in the release layer 5 of the fixing member 4a. It is preferable to impregnate the fluororubber with wax or to impregnate the fluororubber used in the release layer 5 of the fixing member 4a with a mixture of wax and a releasable oil.

In the second embodiment of the present invention, from the viewpoint of further improving the oil repellency of the release layer 6 of the fixing member 4a, the fluoro rubber used for the release layer 6 of the fixing member 4a is reduced. It is preferable to use a molecular fluororesin mixture.

Further, in the first and second embodiments of the present invention, from the viewpoint of reducing the amount of paper dust adhering to the paper as the recording material 1, it is used in the release layers 5 and 6 of the fixing member 4a. Preferably, the surface of the fluororubber to be formed is matted. In the present invention, the fixing member 4a is taken as an example of the fixing member on the side where the unfixed toner image 2 comes into contact. However, for example, in the fixing device 4 for simultaneous double-side fixing, both fixing members 4a, Since the unfixed toner image 2 comes into contact with the fixing member 4b, it is necessary to provide the release layers 5 and 6 of the present invention on the surfaces of the fixing members 4a and 4b.

The present invention is also directed to the fixing device 4 used in the first and second embodiments. That is, as shown in FIG. 1, a fixing device 4 for fixing an unfixed toner image 2 on a recording material 1 made of a wax-containing toner T, as shown in FIG. 4a and 4b, and a release layer 5 made of fluorine rubber having a high affinity for wax is provided on the surface of the fixing member 4a on the side in contact with the unfixed toner image 2 on the recording material 1. It is assumed that. According to another aspect of the present invention, in a fixing device for fixing an unfixed toner image 2 on a recording material 1 made of a wax-containing toner T, a pair of fixing members 4a and 4b for nipping the recording material 1 are provided. Have
The surface of the fixing member 4a on the side of the recording material 1 that contacts the unfixed toner image 2 is provided with a release layer 6 made of oil-repellent fluoro rubber.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in the accompanying drawings. FIG. 2 is an explanatory diagram showing an embodiment (an intermediate transfer type image recording apparatus in this example) of an image recording apparatus to which the present invention is applied. In the figure, reference numeral 21 denotes a photosensitive drum (latent image carrier) which rotates in the direction of an arrow, for example, 22 a charger such as a corotron for charging the photosensitive drum 21 in advance, and 23 a photosensitive member based on each color component image information. An image writing device such as a laser scanning device (ROS) for writing an electrostatic latent image corresponding to each color component on the drum 21 (in this example, beams from the device are denoted by reference numerals),
Reference numeral 24 denotes developing units 241 to 24 corresponding to yellow (Y), magenta (M), cyan (C), and black (K), respectively.
Rotary type (rotary type) in which 4 (magnetic brush developing method, non-contact developing method or the like is appropriately selected) is mounted on a rotary holder 245.
The developing device develops the electrostatic latent image formed on the photosensitive drum 21 by one of the developing units 241 to 244 to form the respective color component toner images 100. Also,
Reference numeral 25 denotes a drum cleaner that removes residual toner on the photosensitive drum 21 as waste toner.

Reference numeral 30 denotes an intermediate transfer belt arranged so as to be in contact with the surface of the photosensitive drum 21;
Plural (for example, five in this embodiment) rolls 31 to 3
5 so as to rotate in the direction of the arrow.
Further, at a portion (primary transfer position) of the intermediate transfer belt 30 facing the photosensitive drum 21, the intermediate transfer belt 30
A primary transfer device (primary transfer roll in the present embodiment) 26 is disposed on the back side of the primary transfer roll 2.
6 is applied with a voltage having a polarity opposite to the charging polarity of the toner, the toner image on the photosensitive drum 21 is transferred to the intermediate transfer belt 3.
It is designed to be electrostatically attracted to zero. Here, the tension roll 3 of the intermediate transfer belt 30 used in the present embodiment is used.
1 to 35, a reference numeral 31 denotes a driving roll provided near the upstream side of a primary transfer portion by the primary transfer roll 26, and a reference numeral 32 denotes a position of the intermediate transfer belt 30 at the primary transfer portion to maintain a predetermined posture. A driven roll (posture holding roll) 33 provided on an extension of the drive roll 31 and the primary transfer roll 26 is a tension roll provided downstream of the driven roll 32 to apply a predetermined tension to the intermediate transfer belt 30. , 34 are tension rolls 3
A driven roll 35 disposed further downstream of 3 is an opposing roll (backup roll) which is one element of a secondary transfer device 40 described later.

Further, the secondary transfer device 40 is located at the secondary transfer position of the intermediate transfer belt 30 facing the conveyance path of the recording material P.
In the present embodiment, a secondary transfer roll 36 is disposed in pressure contact with the toner image bearing surface of the intermediate transfer belt 30, and a secondary transfer roll 36 is disposed on the back side of the intermediate transfer belt 30. And a counter roll (back-up roll) 35 serving as a counter electrode 36. In the present embodiment, the secondary transfer roll 36 is grounded, and a bias having the same polarity as the charged polarity of the toner is stably applied to the backup roll 35 via the power supply roll 37. Reference numeral 41 denotes a belt cleaner that removes residual toner on the intermediate transfer belt 30 as toner.

In the present embodiment, the recording material transport system transports the paper P from the recording material tray 50 to a predetermined transport path by a feed roll 51, and the registration roll (registration roll) in the transport path. (5) After the recording material P is once stopped at 52, the recording material P is conveyed to the secondary transfer position at a predetermined timing, and the recording material P after the secondary transfer is guided to the conveyance belt 53. At the fixing device 60. In the present embodiment, for example, as shown in FIG. 3, the fixing device 60 includes a heating fixing roll 61 having a built-in heater 61a,
A pressure fixing roll 62 which is pressed against the heat fixing roll 61 and rolls; the recording material P is nip-conveyed between the fixing rolls 61 and 62;
0 is fixed by heating. In the drawing, reference numeral 63 denotes an entrance side guide plate for guiding the recording material P to the nip area of the fixing device 60, 64 denotes an exit side guide chute for guiding the recording material P passing through the fixing device 60, and 65 denotes a fixing device 60. Is a discharge roll that discharges and conveys the recording material P that has passed through.

Therefore, according to the present embodiment, the image forming process of this image recording apparatus forms an electrostatic latent image for each of the yellow, magenta, cyan, and black color components on the photosensitive drum 21, and After the respective electrostatic latent images are visualized with the corresponding color toners of the developing units 241 to 244 in the die developing device 24, they are sequentially primary-transferred to the intermediate transfer belt 30, and the respective color component toners on the intermediate transfer belt 30 The superimposed transferred image is secondarily transferred onto the recording material P and fixed by the fixing device 60. When the secondary transfer process is completed, the residual toner on the photosensitive drum 21 is cleaned by the drum cleaner 25, and the residual toner on the intermediate transfer belt 30 is cleaned by the belt cleaner 41.

Particularly, the present embodiment is characterized by (1) the toner to be used, and (2) the release layer 70 on the heating and fixing roll 61 side of the fixing device 60. (1) About Toner Used The electrophotographic toner used in the present embodiment includes a binder resin, a colorant, and a wax as a release agent.
Here, a typical method for producing a toner is a step of dissolving and dispersing a binder resin, a colorant, and a release agent in an oily medium to obtain an oily dispersion mixture, and adding the oily dispersion mixture (oily phase) to an aqueous medium. (Aqueous phase) to form oil droplets, and removing oil medium from the oil droplets to form toner particles. The amount of release agent exposed on the surface as described later Is to obtain 0 to 1% of toner particles. In this production method, a releasing agent previously dispersed into fine particles, and a pigment and a binder resin finely dispersed by a sand mill or the like are dissolved and mixed in an organic solvent in which the binder resin is dissolved, and the oily phase is dissolved. Make it. If necessary, a pigment dispersant, a charge control agent and the like may be mixed. In this case, it is preferable that the melting point of the release agent is lower than the softening point of the binder resin, so that the melt of the release agent easily exudes between the toner and the heat fixing roll during fixing. . The ease with which the release agent exudes is better when the adhesiveness of the melted release agent is lower, and as a result, there is an advantage that the offset resistance can be improved. Also, in order to have full color oil-less adequacy, 100 ° C
Having a viscosity of 100 mPa · s or less can be preferably used.

Examples of the release agent that can be used in the present embodiment include natural or synthetic waxes such as carnauba wax, montan wax, paraffin wax, and microcrystalline wax. Also,
Any known binder resin and colorant can be used. As the binder resin as a fixing component, those soluble in an organic solvent can be preferably used. For example, polyester, polyamide, epoxy resin, polyurea, amino resin such as melamine resin, polyurethane, polyvinyl chloride, polyvinylpyrrolidone, polyacrylate, polymethacrylate, acrylate or methacrylate and acrylic acid or methacrylic acid And a styrene polymer, a styrene-butadiene copolymer, a methyl vinyl ether-maleic anhydride copolymer, a coumarone-indene copolymer resin,
Rubbers and the like can be mentioned. Among these binder resins, a polyester resin is particularly preferable in terms of fixability and color development. As the coloring agent, a dye or a pigment is used. For example, carbon black, red pigment, navy blue, inorganic pigments such as titanium oxide, azo dyes such as fast yellow, disazo yellow, pyrazolone red, chelate red, brilliant carmine, para brown, copper phthalocyanine, phthalocyanine pigments such as metal-free phthalocyanine, flavan And condensed polycyclic pigments such as tron yellow, dibromoanthrone orange, perylene red, quinacridone red, and dioxazine violet. Further, disperse dyes, oil-soluble dyes and the like can also be used. Further, magnetic powder may be used as a colorant.
As the magnetic powder, simple metals such as magnetite, ferrite, iron, cobalt, nickel and the like and alloys thereof can be used. In the present embodiment, the shape of the toner to be formed depends on the amount of the organic solvent, the type of the inorganic dispersant,
Depending on the type of surfactant, it can be controlled to various shapes from amorphous to spherical.

FIG. 4A shows a sectional structure of the toner thus manufactured. In the figure, 101 is a binder resin,
102 is a coloring agent, and 103 is a release agent. As a comparative example, FIG. 3B shows a cross-sectional structure of a toner obtained by a melt-kneading method. According to FIGS. 4A and 4B, the release agent 103 is exposed on the surface of the toner of the comparative embodiment by the melt-kneading method, but the release agent 103 is exposed on the surface of the toner by the above-described manufacturing method. It is understood that no exposure of the mold agent 103 is observed. However, it is preferable that the release agent 103 is less exposed on the toner surface in that excess supply of the release agent 103 can be avoided. However, in the present invention, the release agent 103 is not required to be present on the toner surface. Also, the desired effect can be obtained.

Further, the method for producing the toner is not limited to the above-mentioned one.
As disclosed in JP-A-91028, in the case where an interfacial polymerized toner composed of a shell and a core is obtained by causing a reaction at an interface between an oily phase and an aqueous phase, the acid value of the release agent is similarly controlled. Thereby, a toner having a structure in which a release agent does not substantially exist on the toner surface can be obtained. Also,
As another manufacturing method, a similar effect can be obtained by externally adding a wax to a normal pulverized toner as disclosed in Japanese Patent Application Laid-Open No. Hei 10-91028.

In the present embodiment, in a mode in which a two-component developer is used, the electrophotographic developer is prepared by mixing the above toner with a carrier having a resin coating layer on a core material. You. Here, as the core material of the carrier, metal powder such as ferrite, magnetite, and iron powder having an average particle diameter of 30 to 100 μm is used. As the resin for forming the resin coating layer, styrene-based resin, acrylic-based resin, melamine-based resin, fluorine-containing resin, silicone-based resin, polyamide, and the like are used. Is processed so that the coating amount becomes. Further, the toner is added in an amount of
It can be used in the range of from 20 to 20 parts by weight.

(2) Heating fixing roll 61 of fixing device 60
With respect to the release layer 70 on the side, a release layer is formed on each of the fixing rolls 61 and 62 of the fixing device 60. In particular, a fixing member with which the unfixed toner image 100 contacts, in this example, the heat fixing roll 61 The release layer 70 on the side is configured as follows. That is, in the present embodiment, as the release layer 70, a group having an ethylenically unsaturated bond bonded to a silicon atom as a reactive group to a peroxide-crosslinked fluororubber, a methylsiloxane compound containing a halogen atom and / or a hydrogen atom is used. React at least one. In a preferred aspect of the present embodiment, this reaction is carried out simultaneously with vulcanization by blending the methylsiloxane compound with an unvulcanized peroxide-crosslinked fluororubber composition. Alternatively, it is also possible to use a method in which the surface of an unvulcanized, semi-vulcanized or vulcanized peroxide cross-linked fluororubber molded article is coated with or impregnated with the methylsiloxane compound and reacted.

Here, the crosslinking method of the fluororubber is as follows.
Crosslinking methods utilizing amine cross-linking, polyol cross-linking, peroxide cross-linking and other characteristics of polymers have been developed, and polymers suitable for each cross-linking method have also been developed.
The peroxide-type fluoro rubber to be used in the present embodiment is a vinylidene fluoride-hexafluoropropylene copolymer, a vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymer, a tetrafluoroethylene-propylene copolymer, or the like. Is a type of fluororubber in which halogens, especially bromine and / or iodine, and hydrogen atoms are introduced into the terminal and side chains of the polymer molecular chain. Crosslinking is carried out by a removal reaction of halogen atoms and hydrogen atoms. In the present embodiment, the crosslinking of the rubber composition is carried out by an ordinary method.
That is, the reaction is carried out using a radical generator represented by an organic peroxide compound as a crosslinking agent and a crosslinking aid, generally triallyl isocyanurate. Further, a methylsiloxane compound containing a group having an ethylenically unsaturated bond bonded to a silicon atom, a halogen atom and / or a hydrogen atom as a reactive group used in the present embodiment is not particularly limited,
For example, the following compounds are suitably used (the compounds shown below are all products of Shin-Etsu Chemical Co., Ltd.
Alphanumeric symbols are the company's product names.)

A) Methylsiloxane containing a group having an ethylenically unsaturated bond R—Si (CH ₃ ) ₂ O [Si (CH ₃ ) ₂ O] nSi
(CH ₃ ) ₂ —R R contains an isopropenyl group, and C—S
an organic group bonded to a Si atom by an ik bond, X-22
_{-164B, X-22-164CCH 2 = CCH} 3 CO
_{OC 3 H 3 H 6 Si- (} OSiCH 3) 3, X-22-5
002 (CH ₃ ) ₃ SiO [Si (CH ₃ ) ₂ O] nSi
_{(CH 3) 2 -R, X} -22-174D (CH 3) 3 Si
O (SiHCH ₃ O) ₂ Si (CH ₃ ) ₃ , LS-863
0 [(CH ₃ ) ₃ SiO] ₃ SiH, LS-8650-
(SiHCHO) n- KF-99 b ) methylsiloxane containing reactive halogen atoms [(CH _{3) 3} SiO] _{3 Si (CH 2) 3 Cl} LS-8
700 c) methylsiloxane [HSi (CH _{3) 2]} containing a reactive hydrogen atom ₂ O LS-7040 [HSi (CH _{3) 2} O] _{2 Si (CH 3) 2 LS} -81
30 HSi (CH ₃ ) ₂ OSi (CH ₃ ) ₃ LS-7060

The methylsiloxane compound preferably used in the present embodiment includes chloro, chloroalkyl, phenyl and polyether together with a group having an ethylenically unsaturated bond, a reactive halogen atom and / or a reactive hydrogen atom. , Methylstyryl, cyanoalkyl, trifluoropropyl, perfluoroalkyl, and the like, and methylsiloxane compounds having non-reactive groups in the terminal and / or side chain are included. Needless to say, a mixture thereof is also used as appropriate. be able to. The mixing ratio of the methylsiloxane compound to the peroxide-crosslinked fluororubber is not particularly limited, and is generally 0.1 to 1 with respect to 100 parts by weight of the former.
0, preferably 1 to 5 parts by weight. There is no particular limitation on the amount of coating or impregnating on the surface of the peroxide-crosslinked fluororubber molding as long as the surface can be uniformly coated. The methylsiloxane compound exemplified by the compound is a viscous liquid at room temperature, and can be directly applied to the surface of a fluororubber molded product,
The fluororubber can be applied in the form of a solution in a swellable or non-swellable volatile solvent.

Further, in the present embodiment, the following substances can be added to the peroxide-crosslinked fluororubber in order to impart or modify specific properties. -Rubber mechanical property improver: carbon racks such as MT and FT, dry and wet silica, quartz powder, etc.-Conductivity imparting agent: Ketchen black (Ketchen black)
* [*: Registered trademark; the same applies hereinafter) EC), acetylene blacks, carbon fiber, conductive metal coating powder, conductive inorganic, and ceramic powder, spherical graphite, metal whisker powder, and other antistatic agents: various antistatic agents, Surfactant Abrasion resistance improver: Processability improver such as mica powder: Thermoplastic fluoro rubber (Daiel * Thermoplastics), low molecular weight liquid fluoro rubber (Daiel * G-
101) and fluorosilicone oil and fluorosilicone rubber, fluorinated oil compatibility improver, heat-resistant additive: silicone oil and reactive silicone oil, silicone resin, silicone coupling agent ・ Dielectric property controlling agent: barium titanate, strontium titanate Ceramics such as etc. and organic high dielectric substances ・ High thermal conductivity imparting agent: Metal powder, ceramic powder and various metal oxide powder Heat resistance improving agent: MgO, Ca (OH) ₂ ,
Metal oxides and hydroxides such as PbO, organic amine compounds, and others: PFA (tetrafluoroethylene-perfluorovinyl ether copolymer resin), FEP (tetrafluoroethylene-hexafluoropropylene copolymer resin),
Tetrafluoroethylene oligomers and reactive perfluoroalkylating agents, and perfluoroalkyl compounds, fluoroether compounds, fluoroalkylvinyl ether compounds, etc.

Further, the primary vulcanization conditions and the secondary vulcanization (post-cure) conditions of the fluororubber composition in the method of the present embodiment can be appropriately changed. Standard oven heating conditions are 180 ° C. × 4 hours, but 250 ° C.
There is no problem even at 24 hours for 24 hours. Further, the primary vulcanization and the secondary vulcanization can be performed in a vacuum or in an inert gas such as a carbon dioxide gas, a helium gas, an argon gas or a nitrogen gas. Radiation can also be used in the primary and / or secondary vulcanization. If desired, ultraviolet irradiation or fluorine gas treatment can be applied to the crosslinked rubber.

Further, in the present embodiment, the release layer 70
In order to obtain an oil-repellent fluororubber, for example, an oil-repellency-imparting agent may be added. Here, as the oil repellency imparting agent, for example, a low molecular fluorine resin mixture (polytetrafluoroethylene resin, ethylene tetrafluoride = perfluorovinyl ether copolymer resin, ethylene tetrafluoride =
Hexafluoropropylene copolymer resin).

In this embodiment, if a desired release layer 70 is used for the toner and the fixing device 60 described above, for example, when the fixing is performed by heating the fixing temperature in the range of 80 to 170 ° C., the recording material Good fixing performance was obtained without being affected by the type of paper (paper, OHP, etc.). These details are supported by examples and comparative examples described later. Incidentally, a small amount of release oil may be applied to the heat fixing roll 61 and the like as necessary.

[0048]

Examples ◎ Example 1 (Preparation of pigment dispersion) Polyester resin comprising bisphenol A propylene oxide adduct, bisphenol A ethylene oxide adduct and succinic acid derivative (glass transition point: Tg = 66 ° C., softening point: Tm) = 105 ° C)
20 parts, phthalocyanine pigment 20 parts, and ethyl acetate 2
After placing 00 parts in a sand mill together with 1 mmφ glass beads and dispersing for 3 hours, the glass beads were removed.
A pigment dispersion was obtained. (Preparation of Release Agent Dispersion) Melting point: 89 ° C., viscosity at 100 ° C .: 15.0 mPa.s s, 15 parts of paraffin wax having an acid value of 5 mg / g (HNPO190, manufactured by Nippon Seiro Co., Ltd.)
The mixture was added to 85 parts of ethyl acetate, filled in a pressure-resistant container equipped with a stirrer, heated to 100 ° C., and subjected to high shear stirring. Thereafter, the mixture was rapidly cooled to obtain a release agent dispersion. The average particle size of the dispersed particles was 0.5 μm, and the maximum particle size was about 1 μm.

(Preparation of Color Toner) Pigment Dispersion 1
5 parts, 10 parts of the release agent dispersion, 10 parts of ethyl acetate, and 28 parts of the same polyester resin as above were mixed, and the mixture was stirred to prepare an oily dispersion mixture. On the other hand, a 2% aqueous solution of sodium carboxymethylcellulose (Cellogen BS-H, manufactured by Daiichi Kogyo Seiyaku) was prepared. To this, calcium carbonate (Luminous, manufactured by Maruo Calcium Co.) was added as a dispersion stabilizer to a concentration of 5% by weight. The above oily dispersion mixture was put into the obtained aqueous solution and stirred to form fine oily droplets. Thereafter, the mixture was heated and stirred at 40 ° C. for 2 hours to remove the solvent from the oil droplets. Further, filtration and drying were performed to obtain a spherical cyan toner having an average particle diameter of 7.5 μm. When the cross-sectional structure of the toner was observed, it was confirmed that the release agent was not exposed on the toner surface. In addition, when the amount of the release agent exposed was quantified by X-ray photoelectron spectroscopy, it was confirmed to be 0.1%.

(Evaluation) To the obtained cyan toner, 1% by weight of silica (R972, manufactured by Nippon Aerosil Co., Ltd.) having an average particle diameter of 16 nm was added and mixed. The obtained toner is
A carrier coated with 0.5% by weight of a Cu-Zn ferrite core having an average particle diameter of 50 [mu] m with a styrene-acrylic resin was mixed at a ratio of 6% by weight, and a copying machine (Acolor6) was used.
35, manufactured by Fuji Xerox Co., Ltd.), and an image was formed to obtain an unfixed image.

Further, a peroxide-crosslinked fluororubber (Daiel * G-80) is formed on the surface of the fixing member (heat fixing roll).
1, Daikin Chemical Industries) 100 parts by weight of MT carbon black 20 parts by weight, triallyl isocyanurate (Taike *, Nippon Kasei) 4.0 parts by weight, 2,5-dimethyl-
1.5 parts by weight of 2,5-di-t-butylperoxyhexane (Perhexa * 2.5B, Nippon Oil & Fats) is sufficiently kneaded with a two-roll rubber machine, and a total of 3.0 parts by weight of various kinds A finish rubber roll was prepared by additionally mixing a methylsiloxane compound.

From the obtained composition, 1.
A sheet having a thickness of 5 mm was produced. Next, a diameter of 59.0 mm
The aluminum core was washed and degreased with 1,1,1-trichloroethane, and the surface of the roll was coated with Chemlock 607 (Huguson Chemical Co.) primer as an adhesive, air-dried for 2 hours, and then subjected to the above sheet. ,
Heating and pressurizing was performed at 160 ° C. for 20 minutes in a roll forming mold to obtain a rubber roll having a diameter (outer diameter) of 62 mm. The rubber roll was secondarily heated at 200 ° C. for 4 hours, cooled, and then cooled to an outer diameter of 60.degree.
The surface was ground to 0 mm. Next, when the unfixed image was fixed by the fixing device of the copying machine (without using fuser oil), the fixed image had good color development and good OHP transparency. Further, when a copy test was performed on 200,000 sheets, paper dust was slightly visually confirmed. No paper wrinkles occurred.

Example 2 The low molecular weight ethylene tetrafluoride resin used as an oil repellency-imparting agent for obtaining an oil-repellent fluororubber was 103 to 1
A polymer of ethylene tetrafluoride having a molecular weight of the order of 05, which has been used as an additive to lower the coefficient of friction, improve abrasion resistance or improve tear strength of rubber, plastics, oils, inks, paints, etc. Lubron * L-5, L-2 (Daikin Industries), M
P * 1100, 1200, 1300, 1400, 15
00, TLP * -10F-1 (Mitsui, DuPont, Fluorochemical) and the like are commercially available. There is no particular limitation on the mixing ratio of the low molecular weight ethylene tetrafluoride resin.
It is desirable to mix them by weight or more. Since the ethylene tetrafluoride resin for molding has a high molecular weight of the order of 106, it is difficult to blend it in a large amount and uniformly in fluororubber, and it is not suitable for use for the purpose of the present invention. Formulation: (parts by weight) Daiel * G-901 100.0 TAIC * 4.0 Parhexa * 25B 1.5 Fe50Co * 75.0 MT carbon black 5.0 Lubron * L-2 60.0

The mixture was sufficiently kneaded with a two-roll machine for rubber, and a 1.5 mm-thick sheet was prepared from the obtained compound using a calender. Next, the aluminum core (core metal) having a diameter of 59.0 mm was washed and degreased with 1,1,1-trichloroethane, and Chemlock 607 was used as an adhesive on the roll surface.
(Huguson Chemical Co.) Apply a primer, air-dry for 2 hours, wind the above sheet, heat and press in a roll forming mold at 160 ° C. for 20 minutes, diameter (outer diameter) 62 mm
Rubber roll was obtained. The rubber roll was secondarily heated at 200 ° C. for 4 hours, cooled, and then subjected to surface grinding to an outer diameter of 60.0 mm. Next, when the unfixed image was fixed by the fixing machine of the above copying machine (without using fuser oil), the fixed image had good color development and good OHP transparency. Further, when a copy test of 200,000 sheets was performed, paper dust was slightly visually confirmed, but no offset occurred.

A pigment dispersion was prepared in the same manner as in Example 1. As a release agent, a melting point of 85 ° C. and a viscosity at 100 ° C. of 15.0 mPa. s, a release agent dispersion was prepared in the same manner as in Example 1 using carnauba wax having an acid value of 8 mg / g. Using these, a spherical cyan toner having an average particle diameter of 7.7 μm was obtained in the same manner as in Example 1. When the cross-sectional structure of the toner was observed, it was confirmed that the release agent was not exposed on the toner surface. Also, X
When the amount of release agent exposed was determined by X-ray photoelectron spectroscopy, it was 0.3
%.

Example 3 A pigment dispersion was prepared in the same manner as in Example 1. As a release agent, melting point 70 ° C, viscosity at 100 ° C 10.0 mP
a. s and a release agent dispersion were prepared in the same manner as in Example 1 using a beeswax having an acid value of 17 mg / g. Using these, in the same manner as in Example 1, a cyan toner having a mean particle size of 7.0 μm and a shape close to a potato type was obtained. When the amount of the release agent exposed to this toner was determined by X-ray photoelectron spectroscopy, it was confirmed to be 0.6%. The surface of the fluororubber used in Example 2 was matted by sandblasting. (Evaluation) Evaluation was performed in the same manner as in Example 1. That is, the obtained toner was introduced into a copying machine (Acolor 635, manufactured by Fuji Xerox Co., Ltd.) to obtain an unfixed image, and then fixed by a fixing device (using no fuser oil). Good, and OHP transparency was also good. In addition, when a copy test of 200,000 sheets was performed, a uniform wax coating layer was formed on the surface, so that the releasability was secured and the adhesion of paper dust was prevented. I was able to take it. The amount of adhering paper powder was further reduced as compared with Example 2.

Comparative Example 1 In the same manner as in Example 1, a peroxide-crosslinked fluororubber (Daiel * G-
801, Daikin Chemical Industries) 100 parts by weight of MT carbon black, 20 parts by weight of triallyl isocyanurate (Taike *, Nippon Kasei) 4.0 parts by weight, 2,5-dimethyl-2,5-di-t-butyl par 1.5 parts by weight of oxyhexane (Perhexa * 2.5B, Nippon Oil & Fats) is sufficiently kneaded with a two-roll machine for rubber, and a total of 3.0 parts by weight of various methylsiloxane compounds are additionally blended to finish rubber rolls Was prepared.

From the obtained composition, 1.
A sheet having a thickness of 5 mm was produced. Next, a diameter of 59.0 mm
After washing and degreasing with aluminum core (core metal) 1,1,1-trichloroethane, a primer of Chemlock 607 (Huguson Chemical Co.) as an adhesive is applied to the surface of the roll part, and after air-drying for 2 hours, the sheet is wound. Then, the mixture was heated and pressed in a roll molding die at 160 ° C. for 20 minutes to obtain a rubber roll having a diameter (outer diameter) of 62 mm. The rubber roll was secondarily heated at 200 ° C. for 4 hours, cooled, and then cooled to an outer diameter of 60.0 mm.
mm was subjected to a surface grinding finish. 2 per A4 paper
When 0 μl of the amino-modified silicone oil was applied, partial swelling occurred, and when the paper was ejected, it adhered to the paper and the paper became rib-like and wrinkled.

[0059]

As described above, according to the present invention,
Using a wax-containing toner, and forming a release layer made of fluorine rubber having high affinity for wax or a release layer made of oil-repellent fluorine rubber on the surface of the fixing member on the side in contact with the unfixed toner image. Therefore, in the so-called oil-less system, the fixing performance can always be kept good without being affected by the type of recording material (paper, OHP, etc.). In other words, according to the present invention, it is possible to obtain a high-quality full-color OHP excellent in low-temperature fixing property to a recording material and anti-offset property over a long period of time, which can reliably secure so-called oil-less fixing property, and excellent in transparency. In addition, various adverse effects due to the accumulation of paper dust can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an outline of an image recording apparatus according to the present invention and a fixing device used therein.

FIG. 2 is an explanatory diagram illustrating an overall configuration of an embodiment of an image recording apparatus to which the present invention has been applied.

FIG. 3 is an explanatory diagram illustrating a configuration of a fixing device used in the exemplary embodiment.

4A is an explanatory diagram illustrating a toner structure used in the exemplary embodiment, and FIG. 4B is an explanatory diagram illustrating a toner structure according to a comparative embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Recording material, 2 ... Toner image, 3 ... Toner image forming apparatus, 4
... Fixing device, 4a, 4b ... Fixing member, 5,6 ... Release layer

Claims (10)

[Claims] 1. A toner image forming apparatus for forming an unfixed toner image on a recording material, and a pair of fixing members for nipping the recording material, and fixing the unfixed toner image carried on the recording material. The toner used in the toner image forming device is a toner containing wax, and the surface of the fixing member of the fixing device that is in contact with the unfixed toner image on the recording material. An image recording apparatus comprising a release layer made of fluorine rubber having a high affinity for wax. 2. The image recording apparatus according to claim 1, wherein the fluororubber used in the release layer of the fixing member is a single product or a mixture of a vulcanized silane-modified fluororubber. 3. The image recording apparatus according to claim 1, wherein a releasing oil is impregnated in the fluoro rubber used in the releasing layer of the fixing member. 4. The image recording apparatus according to claim 1, wherein the fluorine rubber used in the release layer of the fixing member is impregnated with wax. 5. The image recording apparatus according to claim 1, wherein the fluororubber used in the release layer of the fixing member is impregnated with a mixture of wax and release oil. Recording device. 6. A toner image forming apparatus for forming an unfixed toner image on a recording material, and a fixing device having a pair of fixing members for nipping the recording material and fixing the unfixed toner image carried on the recording material. The toner used in the toner image forming device is a toner containing wax, and the surface of the fixing member of the fixing device that is in contact with the unfixed toner image on the recording material. An image recording apparatus comprising a release layer made of oil-repellent fluoro rubber. 7. The image recording apparatus according to claim 6, wherein the fluororubber used in the release layer of the fixing member is a low-molecular fluororesin mixture. 8. The image recording apparatus according to claim 1, wherein the fluorine rubber used in the release layer of the fixing member is matted. 9. A fixing device for fixing an unfixed toner image on a recording material formed with a wax-containing toner, comprising: a pair of fixing members for nipping the recording material; On the surface of the fixing member on the contact side,
A fixing device comprising a release layer made of fluorine rubber having a high affinity for wax. 10. A fixing device for fixing an unfixed toner image on a recording material formed with a wax-containing toner, comprising: a pair of fixing members for nipping the recording material; On the surface of the fixing member on the contact side,
A fixing device comprising a release layer made of oil-repellent fluoro rubber.