JP2004086202A - Electrophotographic fixing parts, electrophotographic fixing endless belt and heating roll belt type fixing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide electrophotographic fixing device, an electrophotographic fixing endless belt and a heating roll belt type fixing device in which a high separation characteristic to toner and durability are provided while improving low adhesiveness to papers, affinity to oil and a surface shape (no undulation and no sharp protrusion and a surface shape having microrecesses) and no stretch in recording paper, suppression in pockmark picture quality deviation and high picture quality (improvements in microsprinkled gloss irregularity during both surface printing, image transmissive irregularity of OHP papers, image void and peeling pawl wear mark) are satisfied. <P>SOLUTION: The surface layer provided on the outer peripheral surface includes fluorinated resin that is made of interpolymer (PFA) of tetrafluoroethylene, into which at least one kind of inorganic filler selected from the group consisting of metallic oxide, a silicate mineral, carbon black, a nitrogen compound and mica is arranged, and perfluoroalykylvinylether. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to an electrophotographic fixing component such as a fixing belt and a fixing roll (including a pressure belt and a pressure roll), an electrophotographic fixing endless belt (a fixing belt (pressure belt)), and a powder toner image. The present invention relates to a heating roll / belt type fixing device that simultaneously applies heat and pressure to a formed support to fuse a toner image.

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

Conventionally, as a heat fixing device used for the heat fixing method, a heating roll in which a heater lamp is provided inside a cylindrical core metal and a heat-resistant release layer is formed on an outer peripheral surface thereof, and a heating roll (fixing roll) And a pressure roll in which a heat-resistant elastic layer is formed on the outer peripheral surface of a cylindrical metal core, and between these two rolls, 1 to 15 kg / cm ² , preferably 3 to 10 kg / cm ^2. Is applied, and the fixing is performed by inserting a support such as plain paper on which an unfixed toner image is formed to perform fixing. The heating roll type fixing device used in this method has a higher thermal efficiency than other heat fixing methods such as hot air fixing method and oven fixing method, so it has low power, high speed, and paper. It is currently the most widely used because of the low risk of fire due to clogging.

In recent years, there has been a demand for a higher fixing speed in such a heating roll type fixing device, and in order to satisfy this, it is necessary to increase the width of the nip region, that is, the nip width according to the fixing speed. Methods for increasing the nip width include a method of increasing the load between the rolls, a method of increasing the thickness of the elastic layer of the fixing roll, and a method of increasing the roll diameter of the fixing roll and the pressure roll. . However, there is a limit to the fixing speed that can be handled by these methods, and a heating roll / belt type fixing device has been developed in a higher-speed fixing region.

加 圧 Pressing belts used in the above-described heating roll / belt type fixing device are mainly classified into two types. That is, 1) a silicone rubber-coated belt in which silicone rubber or fluororubber is thinly coated via a primer on an endless belt-like base film, or a fluororubber-coated belt; and 2) a fired base film in the form of an endless belt. After applying an adhesive called a primer on the base, or on an endless belt-like unfired base film, a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether (hereinafter referred to as “PFA”) or polytetrafluoroethylene (Hereinafter referred to as “PTFE”) and a fluororesin-coated belt coated with a fluororesin.

Among these belts, silicone rubber-coated belts contain silicone oil called free oil inside the material, and these have a great effect on the releasability. Shows sex. However, on the other hand, the presence of the free oil has a problem that the outer shape of the belt changes due to a decrease in rubber strength and the release of the free oil.

On the other hand, fluororubber is very durable, has high abrasion resistance, and has excellent elasticity because of its elasticity. However, since the fluororubber itself has a property of repelling polydimethylsiloxane oil (silicone oil) that is generally used as a release agent oil, it is difficult to form an oil release layer between the fluororubber and the toner image. Therefore, a combination of fluororubber and polydimethylsiloxane oil (silicone oil) cannot be used because of poor releasability from low melting point and high color developing toners such as color toners. As for improving this point, some of the mercapto groups of the polydimethylsiloxane oil: -SH _2, or an amino group: -NH ₂ may use the substituted modified silicone oil has been proposed. In this case, the functional group of the mercapto group or the amino group reacts with a metal oxide (MgO, PbO, etc.) or double bond contained in the fluororubber, and a molecular film of silicone oil is formed on the belt surface. It forms and forms a release layer, which modifies the belt surface to a highly releasable surface.

However, the silicone oil having a high release surface modifying property also causes the copy sheet and the surface of the paper feed roll at the time of double-sided copying to be highly released, so that stationery tapes are attached to the obtained copy sheet. However, there is a problem that the paper cannot be fed smoothly by the paper feed roll. For this reason, it has been studied to reduce the amount of the modified silicone oil to be used, or to use almost no modified silicone oil, but in such a case, the inherent tackiness of the rubber of the fluoro rubber appears on the belt surface. At the time of fixing, the surface of the copy paper and the surface coated with the fluororubber may adhere to each other, causing a problem that the copy paper cannot be separated from the surface of the fluororubber after the fixing. This problem is more remarkable when the copy paper is a coated paper having a high surface smoothness, the surface of which is treated with a coating agent.

In order to prevent the above-mentioned problem from occurring, the amount of the modified silicone oil to be used is reduced, or a surface having high release property and low adhesiveness to copy paper even under fixing conditions where little modified silicone oil is used. A belt is required. Such a fixing component such as a fixing belt has a small adhesive force between the toner and the fixing component and an adhesive force between the copy paper and the fixing component surface even when the contribution of the modified silicone oil at the time of fixing is small. Is required to be small.

を In order to realize such demands, attempts have been made to further reduce the surface energy and adhesiveness of a fluororubber material or a fluororesin material provided on the surface of the fixing component. As this attempt, for example, it has been proposed to use a material in which 3 to 50 parts by mass of low-molecular-weight tetrafluoroethylene resin fine particles are blended per 100 parts by mass of fluororubber in the surface layer of the fixing member (for example, see Patent Document 1). ).

技術 With the technology described above, the releasability of the fixing component surface on copy paper such as coated paper can be improved. However, as a result of further studies by the present inventors on the technology described in the above-mentioned publication, when the coated paper is heated under pressure in the nip area during fixing, the paper may be stretched, or when the high-density toner is printed, the coated paper may be loose. It has been found that an image misalignment pattern may occur.

On the other hand, with the recent improvement in the performance of office copying machines, it has become possible to easily print recorded matters having higher-quality images. For this reason, there is an increasing number of occasions in which printed matter easily printed in an office or the like without using a printing company or a bookbinding company is used as it is as a pamphlet or presentation material that requires a good appearance. Therefore, higher quality is demanded for printed matter having high quality image quality.

Therefore, although the above-described paper elongation and rib-shaped image misalignment pattern have not been recognized conventionally, they have recently been taken up as a problem of deteriorating the appearance of a recorded matter, and improvements have been demanded.

(5) The occurrence of the stretching of the paper causes problems such as the stretching of the toner image already printed on the paper and the shift of the positions of the images formed on the front and back surfaces of the paper during duplex printing.

The cause of the remarkable elongation of the paper is that, in the fixing device of the heating roll / belt type, a specific point on the surface of the paper is particularly large because the contact portion (nip area) between the heating roll and the pressure belt is widened. There is a case where the time required for passing through the nip (nip time) becomes longer. Another cause is a case where a pressing belt is pressed and a pressing member having a pad shape is arranged.

高 い In order to improve such paper elongation, higher surface low tackiness is required. Due to the adhesiveness of the fluororubber, the low-adhesiveness of the surface tends to be good by adding the fluororesin fine particles to the fluororubber, but it has not reached the level of suppressing the elongation of the paper. Further, if the amount of addition is excessive, the physical properties such as rubber strength, elongation and rubber elasticity of the fluororubber are originally reduced, so that the toner image cannot be fixed uniformly.

た め Therefore, it has become necessary to study fluororesins having high surface low adhesion. Further, from the viewpoint of heat resistance and flexibility, a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether (PFA) is taken up. Image shift is greatly improved.

However, with the use of a PFA surface, paper elongation and rib-shaped image misalignment are greatly improved. When printing on both sides of paper, when printing on one side of paper for the second time, paper In the image already printed on the other side of the above, minute satin-like gloss unevenness (fine gloss unevenness) is likely to occur. Further, after the fixing, the peeling claw provided for peeling the paper from the heating roll comes into contact with the paper, thereby causing abrasion marks on the paper surface or the image transmission state when printing using OHP paper. Unevenness occurs.

梨 The satin-like gloss unevenness (fine gloss unevenness) is considered to be generated by the following mechanism. A pressure belt receives the modified silicone oil used as the release agent oil from the opposed heated rolls. However, PFA having a high surface release property repels the modified silicone oil, and a uniform oil film cannot be obtained on the pressure belt, resulting in island-like oil droplets. Further, PFA containing a large particle size is used in order to obtain a constant film thickness due to abrasion resistance and workability of the pressure belt. When this large particle size PFA is fired at a high temperature, it hardly melts and has a high melt viscosity, so that it is not completely flat and has a undulating (obtuse convex) PFA surface.

Therefore, at the time of double-sided printing, after printing on one side (first printing side) of the paper, and then printing on the other side (second printing side) of the paper, the first printing side Will come into contact with the surface. At this time, the toner on the first printing surface partially receives the oil on the surface of the pressure belt, and the toner on the first printing surface also applies pressure to the surface of the pressure belt. It is presumed that unevenness in peeling of toner due to unevenness in oil on the surface of the pressure belt on which the island-shaped oil droplets are placed and replicas of undulations in PFA cause satin-like gloss unevenness (fine gloss unevenness). Further, the trace of peeling nail wear is presumed to be caused by insufficient peeling nail wear with PFA alone.

The image transmission unevenness of the OHP paper is caused by the undulation (obtuse convexity) of the PFA on the surface of the pressure belt and the hard surface of the PFA. The surface of the pressure belt cannot follow the unevenness of the toner image as well as the conventional fluororubber, and it is estimated that the unevenness of the pressure on the toner on the OHP paper due to the undulation of PFA.

As described above, a pressure belt made of a material in which fluorocarbon resin particles are blended with fluororubber does not have sufficient low tackiness, and thus suppresses the occurrence of paper elongation and rib-like image quality deviation that will be required in the future. I couldn't do that. On the other hand, the pressure belt made of fluororesin could improve the elongation of paper and the deviation of rib-shaped image quality, but due to the lack of affinity for oil and the surface undulation, it was possible to improve the fine satin There were image quality problems such as uneven gloss and irregular transmission of images on OHP paper.

In other words, a material in which fluorocarbon rubber is blended with fine particles of fluorocarbon resin or a material of a pressure belt made of only fluorocarbon resin is used to suppress paper elongation, deviation of rib-shaped image quality, and high-quality image quality (fine matt-like gloss unevenness during double-sided printing, (Transparency of image transmission of OHP paper and improvement of peeling claw wear marks) could not be simultaneously obtained.

As described above, in order to satisfy the improvement of paper elongation etc. and high quality image quality at the same time, high release property to toner, durability, low adhesiveness to paper, affinity for oil, retention in oil There is a demand for a fixing part such as a pressure belt or a pressure roll, which simultaneously has properties such as properties (surface shape with micro concaves), waviness, and surface shape without sharp projections.
JP 2001-60050 A

The present invention aims to solve the above conventional problems and achieve the following objects. That is, an object of the present invention is to provide a toner having high releasability and durability, low adhesion to paper, affinity for oil, surface shape (no undulation, no sharp projections, and micro concaves). Improves surface shape), suppresses paper growth of recorded material, suppresses rib-shaped image quality deviation, and provides high-quality image quality (fine satin-like gloss unevenness during double-sided printing, image transmission unevenness on OHP paper, image white spots, peeling claw wear It is an object of the present invention to provide a fixing part for electrophotography, an endless belt for fixing electrophotography, and a heating roll / belt type fixing device capable of satisfying (improvement of marks).

The above object is achieved by the present invention described below. That is,
(1) Tetrafluoroethylene in which at least a surface layer provided on the outer peripheral surface is blended with at least one kind of inorganic filler particles selected from the group consisting of a metal oxide, a silicate mineral, carbon black, a nitrogen compound, and mica. A fixing component for electrophotography, comprising a fluororesin made of a copolymer of PFA and perfluoroalkyl vinyl ether (PFA).

(2) The inorganic filler particles are composed of BaSO ₄ , zeolite, silicon oxide, tin oxide, copper oxide, iron oxide, zirconium oxide, ITO (tin-doped indium oxide), silicon nitride, boron nitride, titanium nitride, and mica. The electrophotographic fixing component according to (1), wherein the fixing component is at least one selected from the group consisting of:

(3) The fixing component for electrophotography according to (1), wherein the inorganic filler particles are at least one selected from the group consisting of BaSO ₄ , zeolite, and mica.

(4) The above-mentioned (1) to (1), wherein the surface layer comprises the inorganic filler particles in an amount of 1 part by mass or more and 30 parts by mass or less based on 100 parts by mass of the copolymer (PFA). The fixing component for electrophotography according to any one of 3).

{(5)} The electrophotographic fixing component according to any one of (1) to (4), wherein the inorganic filler particles have an average particle size of 0.1 μm or more and 15 μm or less.

(6) the average particle diameter of the inorganic filler particles is 0.1 μm or more and 10 μm or less;
The fixing component for electrophotography according to any one of (1) to (4), wherein the inorganic filler particles having a particle size of 15 μm or more account for 25% by mass or less of the inorganic filler particles. .

(7) the average particle diameter of the inorganic filler particles is 0.1 μm or more and 10 μm or less;
The fixing component for electrophotography according to any one of (1) to (4), wherein the inorganic filler particles having a particle size of 15 μm or more account for 5% by mass or less of the inorganic filler particles. .

(8) The above (1) to (1), wherein the surface layer comprises 1 to 10 parts by mass of conductive fine particles with respect to 100 parts by mass of the copolymer (PFA). 7) The fixing part for electrophotography according to any one of the above items.

(9) The surface layer is formed from two or more kinds of the copolymer (PFA) particles having different particle diameters,
The copolymer (PFA) particles having an average particle size of 3 μm or more and 30 μm or less are blended in an amount of 5 parts by mass or more and 70 parts by mass or less with respect to 100 parts by mass of the copolymer (PFA) particles having an average particle size of 1 μm or less. The fixing part for electrophotography according to any one of the above (1) to (8), wherein

(10) The surface layer is formed from two or more kinds of the copolymer (PFA) particles having different particle diameters,
In addition, the copolymer (PFA) particles having an average particle diameter of 3 μm to 15 μm are blended in an amount of 5 parts to 30 parts by mass with respect to 100 parts by mass of the copolymer (PFA) particles having an average particle diameter of 1 μm or less. The fixing part for electrophotography according to any one of the above (1) to (8), wherein the fixing part is formed.

(11) The surface layer is formed from two or more kinds of the copolymer (PFA) particles having different particle diameters,
The melt viscosity at 380 ° C. of the copolymer (PFA) particles having an average particle size of 1 μm or less is in a range of 3.5 × 10 ⁴ Pa · s or less,
(1) to (3), wherein the copolymer (PFA) particles having an average particle size of 3 μm or more and 30 μm or less have a melt viscosity at 380 ° C. of 1.5 × 10 ⁴ Pa · s or less. The fixing component for electrophotography according to any one of 10).

(12) The surface layer is formed from two or more kinds of the copolymer (PFA) particles having different particle diameters,
Any of the above-mentioned copolymers (PFA), wherein the melt viscosity at 380 ° C. is in the range of 1.5 × 10 ⁴ Pa · s or less. 3. The fixing part for electrophotography according to item 1.

{(13)} The electrophotographic fixing component according to any one of (1) to (12), wherein the surface layer is subjected to post-processing.

(14) The above (1) to (12), wherein the surface layer is subjected to a post-processing treatment and then to a heat treatment at a temperature at which the copolymer (PFA) particles melt. An electrophotographic fixing part according to any one of the above.

{(15)} The electrophotographic fixing component according to any one of (1) to (14), wherein the surface gloss of the surface layer is in a range of 15 or more and 60 or less.

{(16)} The electrophotographic fixing component according to any one of (1) to (15), wherein the contact angle of the surface layer with the amine-modified silicone oil is 37 ° or less at 170 ° C.

(17) The surface layer has a filter centerline waviness of 0.9 μm or less under a cutoff of 0.25 mm, a ten-point average surface roughness (Rz) of 0.5 μm or more and 15 μm or less, and The electrophotographic fixing component according to any one of (1) to (16), wherein the surface friction coefficient with respect to the coated paper is 0.45 or less.

(18) A fixing endless belt for electrophotography having a heat-resistant layer as a base material formed using at least one composite material selected from the group consisting of polymer resins, metals, ceramics, and glass fibers. The fixing endless belt for electrophotography, wherein the fixing endless belt for electrophotography is the fixing part for electrophotography according to any one of the above (1) to (17).

(19) A pair of fixing units including a heating roll and a pressure belt pressed against the heating roll, and an unfixed toner image is held in a nip region formed by the heating roll and the pressure belt. A heating roll-belt type fixing device that passes a recording material to be fixed and performs fixing by heat and pressure,
A heating roll / belt type fixing device, wherein the pressure belt is the fixing part for electrophotography according to any one of the above (1) to (17).

(20) In the nip region formed by the heating roll and the pressure belt, the time required for the recording material holding the unfixed toner image to pass therethrough is 0.030 seconds or more. A heating roll / belt type fixing device according to 19).

ADVANTAGE OF THE INVENTION According to this invention, while having high release property and durability to toner, low adhesiveness to paper, affinity for oil, surface shape (surface shape without undulation, sharp projections, and micro concaves) ) With high releasability to toner and high durability, while suppressing paper elongation of printed matter, suppressing deviation of rib-shaped image quality, and achieving high-quality image quality (fine matte-like gloss unevenness during double-sided printing, OHP paper It is possible to provide an electrophotographic fixing component, an electrophotographic fixing endless belt, and a heating roll / belt type fixing device capable of satisfying all of the following requirements.

Hereinafter, embodiments of the present invention will be described in detail.

The electrophotographic fixing component of the present invention is preferably a metal oxide fine particle, or at least one inorganic filler particle selected from the group consisting of silicate minerals, carbon black, silicon nitride, nitrogen compounds, and mica, more preferably Is selected from the group consisting of BaSO ₄ , zeolite, silicon oxide, tin oxide, copper oxide, iron oxide, zirconium oxide, ITO (tin-doped indium oxide), silicon nitride, boron nitride, titanium nitride and mica. Copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether blended with at least one kind of inorganic filler particles, still more preferably at least one kind of filler particles selected from the group consisting of BaSO ₄ , zeolite and mica It has a surface layer containing a fluororesin made of (PFA).

The electrophotographic fixing component of the present invention uses PFA having low tackiness (reduction in friction coefficient), high releasability, heat resistance, and flexibility as a constituent material of the surface layer. It has low tackiness and high releasability, and among fluororesins, PFA is particularly excellent in flexibility and heat resistance required as a fixing component.), And specific filler particles are mixed with this PFA. Thus, oil affinity and abrasion resistance are improved, and high adhesiveness to paper and affinity for oil are remarkably improved while having high releasability and durability to toner. Further, regarding the surface shape of the surface layer, by controlling the particle size, blending ratio, and melt viscosity of two types of PFA having different particle sizes, undulation due to PFA is improved, and the particle size and particle size distribution of the filler are controlled. This improves sharp projections due to the filler and forms a micro-concave surface. By controlling the materials of the PFA and the filler, it is possible to obtain a micro-concave surface shape without undulations of the PFA, sharp projections of the filler, and the like. When the control range of the material surface of PFA and the filler is slightly widened, even if undulations of PFA and sharp projections of the filler are generated on the surface layer, they are compensated for by post-processing, and the undulations and micro concaves are formed. It can create a certain surface shape. As described above, in the present invention, the surface shape (surface shape without undulations, sharp projections, and micro-concave surface) is improved, and while having high releasability to toner and durability, the recording material paper It is possible to satisfy all requirements for suppression of elongation and rib-like image quality deviation and high quality image quality (improvement of fine satin-like gloss unevenness at the time of double-sided printing, image transmission unevenness of OHP paper, image whiteout, peeling claw wear mark).

This is because the use of PFA alone as a constituent material of the surface layer has a problem of repelling oil due to the high releasability of PFA. However, by incorporating the above specific filler particles into PFA, the abrasion resistance is reduced. By improving the oil affinity of the PFA material itself and increasing the roughness of the surface layer, a surface shape (micro concave) that can hold oil is realized, and the affinity of oil is further improved. It is thought to be.

お い て In the electrophotographic fixing component of the present invention, the surface layer is preferably formed of two kinds of PFA particles having different particle diameters in order to obtain a surface having excellent durability (securing the film thickness). From the viewpoint of forming a smooth surface layer without undulation, it is preferable to use small PFA particles having a low melt viscosity and / or easy to melt. When a coating film (surface layer) having a thickness of 20 μm or more is formed in the film process, there is a problem that cracks are generated. If the thickness of the surface layer (PFA film) is too small, durability may be impaired due to wear due to long-term use. For this reason, by using two kinds of PFA particles having different particle diameters, the film thickness of the surface layer (PFA film) can be about 60 μm depending on the particle diameter of two kinds of PFA having different particle diameters and the mixing ratio in one film forming process. It can be secured to the extent, and cost reduction can be realized.

平均 The average particle size of the PFA particles (PFA fine particles) on the small particle size side is preferably 1 μm or less. The average particle size of the PFA particles (PFA powder) on the large particle size side is preferably 3 μm or more and 30 μm or less, more preferably 3 μm or more and 15 μm or less, and still more preferably 6 μm or more and 10 μm or less. Further, the surface layer is preferably blended with PFA powder having an average particle diameter of 3 μm or more and 30 μm or less per 5 parts by weight or more and 70 parts by weight or less per 100 parts by weight of PFA fine particles composed of small particles having an average particle diameter of 1 μm or less. It is preferably from 5 parts by mass to 30 parts by mass, more preferably from 10 parts by mass to 20 parts by mass. From the viewpoint of further improving the waviness of the surface layer, the surface layer contains 5 parts by mass of PFA powder having an average particle size of 3 μm or more and 15 μm or less per 100 parts by mass of the PFA fine particles composed of small particles having an average particle size of 1 μm or less. It is preferable to mix it in an amount of 30 parts by mass or less, more preferably 10 parts by mass or more and 20 parts by mass or less.

Here, if the average particle size of the PFA powder to be compounded is smaller than 3 μm and the amount of the PFA powder to be compounded is less than 5 parts by mass per 100 parts by mass of the small-particle PFA fine particles, cracks occur in the surface layer (PFA film). It will be easier. On the other hand, if the average particle size of the PFA powder is larger than 15 μm and larger than 30 parts by mass, the large particle size PFA which cannot be completely melted during firing and cannot be melted on the surface layer (PFA film) surface. Undulations (obtuse convexity) may occur. However, in the case of having post-processing with a means for reducing undulation, PFA powder having an average particle size of 3 μm or more and 30 μm or less may be blended in an amount of 5 parts by mass or more and 70 parts by mass or less.

In addition, the two types of PFA particles having different particle diameters are as follows. The PFA particles (PFA fine particles) on the small particle size side have a melt viscosity at 380 ° C. of 35 × 10 ⁴ poise (3.5 × 10 ⁴ Pa · s) It is preferable that the PFA particles (PFA powder) on the large particle size side be in the range of 15 × 10 ⁴ poise (1.5 × 10 ⁴ Pa · s) or less. From the viewpoint of further improving the undulation of the surface layer, the two types of PFA particles having different particle diameters each have a melt viscosity at 380 ° C. of 15 × 10 ⁴ poise (1.5 × 10 ⁴ Pa · s) or less. And more preferably 10 × 10 ⁴ poise (1.0 × 10 ⁴ Pa · s) or less, and most preferably 5 × 10 ⁴ poise (0.5 × 10 ⁴ Pa · s) or less. When the melt viscosity of this PFA at 380 ° C. exceeds 15 × 10 ⁴ poise, the melted PFA is not spread, and undulation may occur on the surface layer (PFA film) surface.

表面 In the fixing part for electrophotography of the present invention, the surface layer is usually formed using a dispersion type PFA as a PFA coating solution. As the liquid dispersion medium, water is usually used, but an organic solvent may be used if desired, or a mixture of water and an organic solvent such as alcohol may be used to facilitate drying after coating. it can. In order to disperse the PFA particles in the liquid medium, it is preferable to use a surfactant. As the surfactant, an anionic surfactant and a nonionic surfactant are preferable. These surfactants can be used alone or in combination of two or more. Among these, nonionic surfactants are particularly preferred. The amount of the surfactant used is not particularly limited, but is usually used in such a ratio that the PFA particles can be uniformly dispersed in the liquid medium. In addition, a thickener may be used to facilitate control of the film thickness and application. The amount of the thickener used is not particularly limited. It can be adjusted by a coating method to facilitate coating. The procedure for preparing two kinds of PFA paints having different particle diameters is not particularly limited, but a method of mixing large PFA powder with a dispersion liquid in which small PFA particles are dispersed in a liquid medium mixed with a surfactant. Is preferred.

In the fixing part for electrophotography of the present invention, the filler particles blended in the surface layer (PFA film) are selected from the group consisting of metal oxide fine particles or silicate minerals, carbon black, nitrogen compounds, and mica. At least one inorganic filler particle selected. Among them, more preferably, from the group, BaSO ₄ , zeolite, silicon oxide, tin oxide, copper oxide, iron oxide, zirconium oxide, ITO (tin-doped indium oxide), silicon nitride, boron nitride, titanium nitride and mica At least one kind of inorganic filler particles selected from the group consisting of BaSO ₄ , zeolite, and mica. Still more preferably, BaSO ₄ or zeolite, and more preferably, BaSO ₄ . The mixing ratio of the filler particles can be set as appropriate, but is preferably set in the range of 1 to 30 parts by mass, more preferably 1 to 20 parts by mass, per 100 parts by mass of PFA. If the compounding ratio of the filler particles is less than 1 part by mass, the high releasability of PFA makes the release of toner and paper very excellent, but the abrasion resistance to contact materials such as peeling nails is poor. In addition, the surface is easily scratched and the like, and the oil affinity for the modified silicone oil or the like is poor, so that minute gloss unevenness during double-sided printing is likely to occur. If the amount is more than 30 parts by mass, it is difficult to obtain a uniform dispersion state, and not only the film thickness becomes uneven, but also the high releasability of PFA is reduced, and toner offset is likely to occur. In the case of a pressure belt (fixing belt), the roughness of the surface layer (PFA film) and the surface properties such as gloss are reduced, and the gloss of the image is reduced. That may occur.

平均 The average particle size of the filler particles is preferably 0.1 μm or more and 15 μm or less, more preferably 1 μm or more and 10 μm or less, and even more preferably 2 μm or more and 8 μm or less. It is preferable that the average particle size is 1 μm or more and 10 μm or less, and the particles having a size of 15 μm or more are in a range of 25% by mass or less. In particular, from the viewpoint of further improving sharp projections on the surface layer, the filler particles preferably have an average particle size of 1 μm or more and 10 μm or less, and particles of 15 μm or more are preferably in a range of 5% by mass or less. Preferably, the particles having a size of 15 μm or more are in a range of 3% by mass or less. When the average particle size of the filler particles is smaller than 0.1 μm, the surface area of the powder increases, and it may be difficult to add and disperse the filler particles to PFA. Further, since the roughness is small, the effect of forming a surface shape (micro concave) having a certain roughness and burying the surface layer (PFA film) in the undulation may be reduced. If it is larger than 10 μm, there may be a problem that the surface layer made of PFA to which the filler particles are added becomes too rough. Further, in the filler particles, if the particle size of 15 μm or more exceeds 5% by mass, the filler particles having a large particle diameter tend to become sharp projections like barbs, and the sharp projections are formed into an image (during double-sided printing). ), And white image defects may occur. However, in the case of having post-processing with a means for cutting sharp projections, the filler particles have an average particle size of 0.1 μm or more and 10 μm or less, and particles of 15 μm or more are in a range of 25% by mass or less. You may.

導電 In addition, conductive particles can be used as the filler particles. In some cases, it is required for the fixing component to have conductivity depending on various conditions of the electrophotographic apparatus. In this case, the PFA may be mixed with conductive particles as filler particles. As the conductive particles, other types of particles than the above-mentioned specific filler particles can be used. When conductive particles are used as the filler particles, from 1 to 10 parts by mass per 100 parts by mass of PFA, from the viewpoint of imparting conductivity and maintaining the releasability of PFA and the problem of dispersion of the conductive particles. It is suitable.

In the fixing part for electrophotography of the present invention, the specific filler particles are mixed with the PFA as described above, and the material type and the mixing amount are appropriately selected or the post-processing is performed. It becomes possible to control various characteristic values in the layer. Preferred various characteristic values will be described.

In the fixing part for electrophotography according to the present invention, the surface layer preferably has a ten-point average surface roughness (Rz) in the range of 0.5 μm to 15 μm, more preferably 1 μm to 10 μm, and still more preferably. 2 μm or more and 8 μm or less. When the surface roughness is smaller than 0.5 μm, the oil retention due to the roughness in the surface layer tends to decrease. When the surface roughness is larger than 15 μm, the gloss of the surface layer surface decreases, and the fixed image gloss during double-sided printing is reduced. And the surface roughness may appear in the image.

に お い て In the fixing part for electrophotography according to the present invention, the surface layer preferably has a surface gloss of 15 to 60, more preferably 20 to 50. If the surface gloss is smaller than 15, the fixed image gloss at the time of double-sided printing tends to decrease, and in the case of glossy coated paper or the like, the gloss of the image is lower than the gloss of the paper, and the quality of the output product deteriorates. Sometimes. On the other hand, when the surface gloss is larger than 60, the surface becomes smooth, so that the ability to physically retain oil such as a modified silicone oil is reduced, and unevenness of the matte is easily generated, and the image gloss is also increased. This can make it more noticeable.

に お い て In the electrophotographic fixing component of the present invention, the contact angle of the surface layer with the amine-modified silicone oil is preferably 37 ° or less at 170 ° C., more preferably 35 ° or less. Since the fixing part for electrophotography usually uses a modified silicone oil as an oil (release agent) and is used in a heated state, by setting the contact angle under the above conditions to the above range, the double-sided printing can be performed. Irregularities such as satin can be reduced.

に お い て In the fixing part for electrophotography according to the present invention, the surface layer preferably has a filter centerline waviness of 0.9 μm or less, more preferably 0.7 μm or less under a condition of a cutoff of 0.25 mm. If a waviness pattern (several irregularities with a height of several μm and a pitch of 0.5 mm to several mm) is generated on the surface of the surface layer, uneven transmission of OHP and fine gloss at the time of double-sided printing on coated paper when use is advanced. By setting the swell of the filter center line to the above range, unevenness in transmission of OHP and minute unevenness of gloss in double-sided printing on coated paper can be prevented when use is advanced.

に お い て In the fixing part for electrophotography of the present invention, the surface layer preferably has a surface friction coefficient on coated paper of 0.45 or less, more preferably 0.35 or less. By setting the surface friction coefficient for the coated paper within the above range, it is possible to prevent the paper (especially the coated paper) from increasing in elongation.

In the fixing part for electrophotography according to the present invention, particularly, the surface layer has a filter centerline waviness of 0.9 or less (cutoff 0.25 mm condition) and a ten-point average surface roughness (Rz) of 0.5 μm. By simultaneously satisfying a range of 15 μm or less and a surface friction coefficient of 0.45 or less with respect to coated paper, paper elongation, rib-shaped image shift and satin-like fine gloss unevenness, image white spots, OHP It is possible to achieve both suppression of transmission unevenness and suppression of wear marks of the peeling claw.

In the fixing part for electrophotography according to the present invention, the surface layer may have a slight undulation pattern (several irregularities having a height of several μm and a pitch of 0.5 mm to several mm) or local projections, depending on the material type and the amount of the compound. (Sharp projections) may occur, but by performing post-processing, this waviness pattern (several irregularities having a height of several μm and a pitch of 0.5 mm to several mm) and local projections will occur. This can be suppressed, and various physical properties of the surface layer can be controlled. Examples of the post-processing include conventionally known processing methods such as a belt grinding method, a ball polishing method, a blast polishing method, a brush polishing method, and a buff polishing method.

後 Further, if post-processing is performed, Defects (specifically, processing flaws, foreign matter adhesion, and the like) due to polishing may occur. For this reason, it is preferable to further perform a heat treatment at a temperature higher than a temperature at which PFA (fluororesin) melts after the post-processing. By this heat treatment, the Defect disappears, and the various physical properties of the surface layer can be more effectively controlled.

The fixing part for electrophotography of the present invention may be a roll-shaped member or a belt-shaped member. As a surface layer of these members, a surface layer made of PFA mixed with the specific filler is used. It is provided on the outer peripheral surface.

(Fixing endless belt for electrophotography)
The electrophotographic fixing endless belt of the present invention is a belt-shaped electrophotographic fixing component of the present invention. The fixing endless belt for electrophotography of the present invention generally contains the above-mentioned specific filler directly or via an intermediate layer (for example, a heat-resistant elastic layer) on the outer peripheral surface of the endless belt-like base substrate. A surface layer made of PFA is provided. Specifically, for example, after applying an adhesive called a primer to the baked substrate surface (or intermediate layer) in the form of an endless belt as a pretreatment for forming a surface layer on the outer peripheral surface of the base substrate, A surface layer made of PFA containing the above-mentioned specific filler is formed on a belt-like unsintered base material.

As the base material, any material having a strength suitable for winding a supporting roll or a pressure roll for stretching the endless belt may be used, such as a polymer film, a metal film, a ceramic film, and a glass fiber film. Alternatively, a composite film obtained by combining any two or more of these can be used. As the above polymer film, polyesters such as polyethylene terephthalate, polycarbonates, polyimides, fluorine-based polymers such as polyvinyl fluoride and polytetrafluoroethylene, polyamides such as nylon, polystyrene and polyacryls, polyethylene and the like. Polypropylene, cellulose-modified products such as polyacetate cellulose, polysulfones, polyxylylenes, sheet-like or cross-formed products such as polyacetals, and the like. And a polymer composite obtained by laminating a heat-resistant resin layer such as a crosslinkable polymer. Among these, it is preferable that the base substrate is made of an endless belt-like heat-resistant resin.

Further, such a polymer film may be combined with a heat-resistant layer formed of metal, ceramics, or the like, and may have a granular, acicular, or fibrous carbon black, graphite, alumina, silicon, Even if a thermal conductivity improver such as a bite or boron nitride is added, or if necessary, an additive such as a conductive agent, an antistatic agent, a release agent, or a reinforcing agent is added or applied to the inside or the surface. Good. Further, in addition to the above-mentioned polymer film, for example, papers such as condenser paper and glassine paper, ceramics films, glass fiber films formed into a cross shape with glass fibers, stainless steel films, and metals such as nickel films Film can be used.

(Heating roll belt type fixing device)
The heating roll / belt type fixing device of the present invention has a pair of fixing units including a heating roll and a pressure belt pressed against the heating roll, and is formed by the heating roll and the pressure belt. This is an apparatus for passing a recording material holding an unfixed toner image through a nip area and performing fixing by heat and pressure. The pressure belt includes the endless belt for electrophotography of the present invention.

Hereinafter, the heating roll / belt type fixing device of the present invention will be described with reference to the drawings, but is not limited thereto. FIG. 1 is a schematic configuration diagram showing one embodiment of a heating roll / belt type fixing device of the present invention. FIG. 2 is a schematic configuration diagram showing another embodiment of the heating roll / belt type fixing device of the present invention.

The heating roll / belt type fixing device shown in FIG. 1 is provided with a fixing roll 1 and a pressure belt 2 facing each other as a fixing unit, and as the pressure belt 2, a surface made of PFA containing the above specific filler. The endless belt for electrophotography according to the present invention is provided with the layer 2c provided on the outer peripheral surface. The pressing belt 2 is pressed against the heating roll 1 by a pressing pad 12 (pressing member) and a pressing roll 11 (pressing member) arranged inside the periphery thereof, and is pressed against and forms a nip. The pressure pad 12 (pressure member) has a pad-shaped contact portion (pressing portion) with the pressure belt 2, and further includes a rubber-like elastic portion in the contact portion or in the vicinity thereof. There may be.

In the present invention, “the shape of the contact portion is a pad shape” means that the shape of the portion where the pressure pad 12 contacts the pressure belt 2 is the heating roll 1, the pressure roll 11, and It refers to such a shape that it is in close contact with the inner peripheral surface of the pressure belt 2 stretched by two support rolls with almost no gap.

In addition, the vicinity in the case of “the contact portion or the vicinity thereof” refers to a portion to which elasticity can be given to the contact portion of the pressure pad 12 by the elastic portion. Preferably, the contact portion and the pressure pad 12 in a range of up to 10 mm in a vertical direction from the contact portion.

Furthermore, "the contact portion or its vicinity includes a rubber-like elastic portion" means that at least a part of the contact portion or its vicinity is made of a material having elasticity.

The rubber-like elastic portion refers to a heat-resistant rubber typified by silicone rubber, fluorine rubber and the like.

(4) The pressure pad 12 may have a plurality of pressure portions having different hardnesses along the traveling direction of the recording material. In this case, for example, it is often preferable that one of the pressure members is formed of a rubber-like elastic member and the other is formed of a pressure member made of a hard pressure applying member such as a metal. When the pressure pad 12 is composed of a plurality of pressure portions having different hardnesses, the pressure in the nip area is higher on the recording material discharge side than on the recording material intrusion side, and the recording material (particularly, the thin recording material) is separated. It is preferable because the property is improved. For example, it is preferable that the pressing portion of the pressing pad 12 on the recording material entry side is formed of a rubber-like elastic member, and the pressing portion of the recording material discharge side is formed of a hard pressure applying member such as a metal. The pressure in the area can be made higher on the recording material discharge side than on the recording material entry side.

(4) In order to improve the slidability between the pressure pad 12 and the inner surface of the pressure belt 2, the pressure pad 12 may be arranged via a slide sheet made of a heat-resistant resin or a fluororesin.

The pressure roll 1 is configured by sequentially forming a heat-resistant elastic layer 1b and a heat-resistant release layer 1c on a metal hollow core metal core 1a having a heater lamp 1d inside. The metal core 1a, the heat-resistant elastic layer 1b, and the heat-resistant release layer 1c can be made of a conventionally known material.

The pressure belt 2 is stretched by two support rolls 10 and one pressure roll 11, and the support roll 10 has a heater lamp 2d inside. Reference numeral 4 denotes an unfixed toner image formed on the recording material 3 such as plain paper.

Around the fixing roll 1, a release agent applying device 5 for applying a release agent oil, a cleaning device 6 for cleaning the roll surface, an external heating device 7 for heating the fixing roll 1 from the surface, A peeling claw 8 for peeling off the sheet after fixing and a temperature sensor 9 for controlling the temperature of the surface of the fixing roll 1 are provided.

In the fixing device shown in FIG. 1, a recording material 3 holding an unfixed toner image 4 on its surface is conveyed in a direction indicated by an arrow A by a conveying means and a pressure belt 2 (not shown), and is rotationally driven in a direction indicated by an arrow B. The heating roll 1 and the pressing belt 2 are pressed into contact with each other and inserted into a nip region formed. At this time, the recording material 3 is inserted so that the surface of the recording material 3 on which the unfixed toner image 4 is formed and the surface of the heating roll 1 face each other. When the recording material 3 passes through the nip area, heat and pressure are applied to the recording material 3, so that the unfixed toner image 4 is fixed on the recording material 3. After passing through the nip area, the recording material after fixing is peeled off from the heating roll 1 by the peeling claw 8, and is discharged from the belt-type fixing device. Thus, the fixing process is performed.

The fixing device shown in FIG. 2 is a device that aims at achieving both further miniaturization, energy saving, and high speed, and has no support roll or pressure roller for stretching the belt, and a belt traveling guide. The pressing belt 21 is driven by receiving a driving force from the heating roll 20 while being guided along the fixing roller 23. Such a belt-type fixing device has a type having a supporting roll and a pressing roll (see FIG. 1). The fixing device is referred to as a free belt type fixing device. The fixing device shown in FIG. 2 includes, as a fixing unit, a fixing roll 20 and a pressure belt 21 facing each other as a fixing unit, and the pressure belt 21 is a surface layer made of PFA mixed with the above specific filler. 21c is provided with the fixing endless belt for electrophotography of the present invention provided with the fixing belt 21c. The pressing belt 21 is pressed against the heating roll 20 by a pressing pad 22 (pressing member) disposed inside the periphery thereof, and is pressed against the heating roll 20 to form a nip. The pressure belt 21 is driven and guided by receiving the driving force from the heating roll 20.

The pressing pad 22 (pressing member) has two pressing portions 22a and 22b having different hardnesses along the traveling direction of the recording material. The pressing portion 22a on the recording material entry side of the pressing pad 12 is formed of a rubber-like elastic member, and the pressing portion 22b on the recording material discharge side is formed of a hard pressure applying member such as a metal, and the pressure in the nip area is recorded. The recording material discharge side is higher than the material entry side. With this configuration, the releasability of the recording material (especially a thin recording material) is improved as described above. The pressing portions 22a and 22b are supported by a holder 22c and press the heating roll 20 from the inner peripheral surface of the pressing belt 21 via a low friction layer 22d such as a glass fiber sheet or a fluororesin sheet containing Teflon (R). ing.

The heating roll 20 is configured by sequentially forming a heat-resistant elastic layer 20b and a heat-resistant release layer 20c on a metal hollow core metal core 20a having a heater lamp 24 inside. The metal core 20a, the heat-resistant elastic layer 20b, and the heat-resistant release layer 1c can be made of a conventionally known material.

(4) Around the heating roll 20, there are provided a peeling blade 28 for peeling the sheet after fixing, and a temperature sensor 25 for controlling the temperature of the roll surface.

In the fixing device illustrated in FIG. 2, similarly to the fixing device illustrated in FIG. 1, a recording material 26 that holds an unfixed toner image 27 on the surface is conveyed in a direction indicated by an arrow A by a conveying unit (not illustrated). The heating roller 20, which is driven to rotate in the direction, and the pressure belt 21 are pressed into contact with each other, and are inserted into a nip region formed. At this time, the recording material 26 is inserted so that the surface of the recording material 26 on which the unfixed toner image 27 is formed and the surface of the heating roll 20 face each other. When the recording material 26 passes through the nip area, heat and pressure are applied to the recording material 26, so that the unfixed toner image 27 is fixed on the recording material 26. After passing through the nip area, the recording material after fixing is separated from the heating roll 20 by the separating claw 28 and discharged from the belt-type fixing device. Thus, the fixing process is performed.

In the heating roll / belt type fixing device of the present invention, the time (nip time) in which the recording material holding the unfixed toner image passes through the nip area formed by the heating roll and the pressure belt is 0.030 seconds. It is desirable to do the above. If the nip time is shorter than 0.030 seconds, it becomes difficult to achieve both good fixing properties and prevention of paper wrinkles and curls. Therefore, it is necessary to increase the fixing temperature, which wastes energy and reduces the amount of parts. It is not preferable because the durability is lowered and the temperature of the apparatus is increased. The upper limit of the NIP time is not particularly limited, but is preferably 0.5 second or less in view of the balance between the fixing processing capacity and the size of the apparatus and members.

Hereinafter, the present invention will be described more specifically with reference to examples. However, these embodiments do not limit the present invention.
[Examples 1, 2, 3, 4, 5, 6 and Comparative Examples 1, 2]
Each of the PFA compositions shown in Table 1 was coated on the polyimide sheet sample to a thickness of 30 μm (however, the fluororubber composition of Comparative Example 2 was 180 μm on the polyimide sheet sample), and Examples 1, 2, 3, 4, 5, 6 and Comparative Example 1 were baked at 380 ° C. for 40 minutes, and Comparative Example 2 was baked at 230 ° C. for 3 hours to produce sheet-shaped samples. With respect to the surface of the obtained sheet-like sample, as a material property evaluation, a friction coefficient with respect to copy paper, a contact angle of pure water and oil, a surface roughness, undulation, and a surface gloss were measured. Further, using each material shown in Table 1, coating was performed on an endless polyimide belt under the same conditions as on the polyimide sheet sample, and evaluation of system characteristics (physical properties at the time of fixing) was performed. Uneven transmission, white spots on the image, and traces of peeling nail wear were evaluated. Each evaluation method is shown below. Table 2 shows the evaluation results.

　なお、表１におけるＰＦＡとして、実施例１、２、３、４、５においては、低溶融粘度（３．０×１０⁴〜５．０×１０⁴ポイズ；０．３×１０⁴〜０．５×１０⁴Ｐａ・ｓ：３８０℃）の平均粒径０．２μｍＰＦＡと低溶融粘度（３．０×１０⁴〜５．０×１０⁴ポイズ；０．３×１０⁴〜０．５×１０⁴Ｐａ・ｓ：３８０℃）の平均粒径８μｍＰＦＡ粉末の混合品溶融粘度、粒径調整タイプ（三井・デュポンフロロケミカル社製）、実施例６、比較例１においては、高溶融粘度（２７．０×１０⁴〜２９．０×１０⁴ポイズ；２．７×１０⁴〜２．９×１０⁴Ｐａ・ｓ：３８０℃）の平均粒径０．２μｍＰＦＡと低溶融粘度（３．０×１０⁴〜５．０×１０⁴ポイズ；０．３×１０⁴〜０．５×１０⁴Ｐａ・ｓ：３８０℃）の平均粒径１８μｍＰＦＡ粉末の混合タイプ７１０ＣＬ（三井・デュポンフロロケミカル社製）を用いた。なお、表１中の粒径の異なる２種のＰＦＡの配合比はＰＦＡ粉末質量部／１００質量部の小粒径ＰＦＡの比から１００質量部ＰＦＡ中のＰＦＡ粉末質量部／小粒径ＰＦＡ質量部の比に換算した。また、充填剤として、実施例１では、硫酸バリウム（堺化学社製：ＢＭＨ−６０：平均粒径５μｍ、１５μｍ以上の大粒子が２質量％以下である）、実施例２では、ゼオライトトヨビルダー（東ソー社製）を用いた。実施例３では、硫酸バリウム（堺化学社製：ＢＭＨ−６０：平均粒径５μｍ、１５μｍ以上の大粒子が２質量％以下である）とマイカイリオジン１１１（日本メルク社製）を用いた。実施例４では、窒化ホウ素ＳＰ−２（電気化学社製）を用いた。実施例５では、酸化スズ（ＳｂドープＳｎＯ₂）の水分散体ＳＮ−１００Ｄ（石原産業社製）を用いた。実施例６では、簸性硫酸バリウム（堺化学社製：ＢＡ：平均粒径８μｍ、１５μｍ以上の大粒子が１７質量％である）を使用した。一方、比較例２のフッ素ゴム組成物は、フッ素ゴムポリオール加硫タイプＧ−７０２（ダイキン社製）９５質量部に対して、ゴム用配合剤酸化マグネシウム（協和化学社製）を５質量部配合したものを用い、ＰＴＦＥ粒子として、ルブロンＬ−５Ｆ（ダイキン社製）を配合した。
−実施例及び比較例における物性評価方法−
（１）　表面摩擦係数測定
　新東科学（株）製表面摩擦係数測定機　ＨＥＩＤＯＮを使用し、コピー用紙（Ｃｏｌｏｒ　Ｘｐｒｅｓｓｉｏｎ　Ｇｌｏｓｓ　Ｃｏａｔｅｄ　Ｔｅｘｔ　１２０ｇｓｍ：ゼロックスコーポレーション製両面コート紙）とサンプルを面接触させ、コピー用紙を可動、サンプルを固定し、荷重１５０ｇ、移動スピード５ｍｍ／ｓｅｃの条件で測定した。
（２）　表面接触角測定（純水、オイルの接触角）
　純水の接触角：協和界面科学（株）製表面接触角測定機を使用し、サンプル表面にイオン交換水の水滴を滴下し、その水滴とサンプル表面との接触角を側面より測定した。

In addition, as PFA in Table 1, in Examples 1, 2, 3, 4, and 5, low melt viscosity (3.0 × 10 ^{4 to} 5.0 × 10 ⁴ poise; 0.3 × 10 ^{4 to} 0. PFA having an average particle size of 5 × 10 ⁴ Pa · s: 380 ° C.) and a low melt viscosity (3.0 × 10 ^{4 to} 5.0 × 10 ⁴ poise; 0.3 × 10 ^{4 to} 0.5 × 10 ⁴ poise). ^The melt viscosity of the mixture of PFA powder having an average particle size of 8 μm ( ⁴ Pa · s: 380 ° C.) and a particle size control type (manufactured by DuPont-Mitsui Fluorochemicals Co., Ltd.), a high melt viscosity (27. 0 × 10 ^{4 to} 29.0 × 10 ⁴ poise; 2.7 × 10 ^{4 to} 2.9 × 10 ⁴ Pa · s: 380 ° C.) Average particle size of 0.2 μm PFA and low melt viscosity (3.0 × 10 4 ⁴ to 5.0 × 10 ^{4 poise; 0.3 × 10 4 ~0.5 × 10} 4 Pa · s: 380 ℃) average particle size 18μmPFA powder Mixed type 710CL (manufactured by Du Pont-Mitsui Fluorochemicals Co., Ltd.) was used. The mixing ratio of the two kinds of PFAs having different particle diameters in Table 1 is calculated from the ratio of PFA powder mass part / 100 parts by mass small particle diameter PFA to 100 parts by mass PFA powder mass part / small particle diameter PFA mass in 100 parts by mass PFA. Parts were converted to ratios. In Example 1, barium sulfate (manufactured by Sakai Chemical Co., Ltd .: BMH-60: average particle size is 5 μm, large particles having a size of 15 μm or more are 2% by mass or less) as a filler, and in Example 2, zeolite Toyobuilder is used. (Manufactured by Tosoh Corporation) was used. In Example 3, barium sulfate (manufactured by Sakai Chemical Co., Ltd .: BMH-60: large particles having an average particle size of 5 μm and 15 μm or more is 2% by mass or less) and mykaliodin 111 (manufactured by Nippon Merck Ltd.) were used. In Example 4, boron nitride SP-2 (manufactured by Denki Kagaku) was used. In Example 5, an aqueous dispersion SN-100D (manufactured by Ishihara Sangyo Co., Ltd.) of tin oxide (Sb-doped SnO ₂ ) was used. In Example 6, eluent barium sulfate (manufactured by Sakai Chemical Co., Ltd., BA: average particle size 8 μm, 17% by mass of large particles having a size of 15 μm or more) was used. On the other hand, the fluororubber composition of Comparative Example 2 was prepared by blending 5 parts by mass of a rubber compounding agent magnesium oxide (manufactured by Kyowa Chemical Co., Ltd.) with 95 parts by mass of a fluororubber polyol vulcanized type G-702 (manufactured by Daikin). Using this, Lubron L-5F (manufactured by Daikin) was blended as PTFE particles.
-Physical property evaluation method in Examples and Comparative Examples-
(1) Surface Friction Coefficient Measurement Using a surface friction coefficient measuring instrument HEIDON manufactured by Shinto Kagaku Co., Ltd., the sample is brought into surface contact with copy paper (Color Xpression Gloss Coated Text 120gsm: double-sided coated paper manufactured by Xerox Corporation), and the copy paper is copied. Was measured, the sample was fixed, and the measurement was performed under the conditions of a load of 150 g and a moving speed of 5 mm / sec.
(2) Surface contact angle measurement (contact angle of pure water and oil)
Contact angle of pure water: Using a surface contact angle measuring device manufactured by Kyowa Interface Science Co., Ltd., a droplet of ion-exchanged water was dropped on the sample surface, and the contact angle between the droplet and the sample surface was measured from the side.

Oil contact angle: Using a surface contact angle measuring device manufactured by Kyowa Interface Science Co., Ltd., the sample was immersed in fuser oil (manufactured by Fuji Xerox Co., Ltd.) for 2 hours. (Set temperature: 180 ° C., measured temperature: 170 ° C.), an oil drop of fuser oil was dropped on the sample surface, and the contact angle between the oil drop and the sample surface was measured from the side.
(3) Surface roughness (ten-point average roughness Rz) measurement Using a surface roughness measuring device manufactured by Tokyo Seimitsu Co., Ltd., a probe was brought into contact with the sample surface with a load of 0.07 g, and a traverse speed of 0.03 mm / The measurement was performed after moving 2.5 mm in sec. The measurement magnification was set to 50 in the horizontal direction and 5000 in the vertical direction, and the ten-point average roughness (Rz) was determined.
(4) Evaluation of surface undulation The obtuse convexity (undulation) of the sample surface was visually observed, and the state of undulation was evaluated in the following two stages.
：: Swell is hardly observed.
Δ: The swell is at a level that is practically acceptable, but is slightly observed.
X: The swell can be visually observed.
(5) Surface gloss measurement Using a micro gloss meter manufactured by Gardner Co., Ltd., the micro gloss meter was adhered to the sample surface, and the measurement was performed under the conditions of incident / reflection angle: 75 ° / 75 °.

(6) Evaluation of paper elongation The paper feeding direction of double coated paper (Color Xpression Gloss Coated Text 120gsm: double coated paper manufactured by Xerox Corporation) after the fixing process so that the paper feeding direction and the longitudinal direction of the paper are parallel. The elongation of the paper in the longitudinal direction) is measured. The case where the amount of elongation of the paper is 2 mm or more is judged to be a level that poses a practical problem.
：: paper elongation <2 mm.
X: The amount of elongation of the paper ≧ 2 mm.

(7) Evaluation of rib-like image quality deviation Halftone single-color black (50% density) image was printed on one side of A3 size OK TOP coated paper (Oji Paper, 127.9 g / m ² basis weight) and visually observed. To check whether a rose pattern is generated on the printing surface.
：: The rose pattern is hardly observed.
X: The rose pattern can be visually observed.

(8) Evaluation of fine satin-like gross unevenness The coated paper on which the solid black image was formed after the fixing treatment was visually observed from a place approximately 30 cm away from the image in a sufficiently bright room, and compared with a comparative sample. The presence or absence of gross unevenness and the degree of occurrence are confirmed by the following.
：: Gloss unevenness is hardly observed.
Δ: No uneven gloss is observed at a glance, but uneven gloss can be observed by reflecting the surface on which the image is formed to a light source.
×: A level at which uneven gloss can be observed at a glance.

(9) Evaluation of OHP Image Transmission Unevenness An OHP sheet (V556) on which a solid image of 20 mm × 20 mm was formed for each color of cyan, magenta and yellow was projected on a screen by an OHP machine, and this projected image was separated by 3 m. The presence or absence of image transmission unevenness is evaluated by visual observation.
：: Image transmission unevenness is hardly observed.
Δ: Image transmission unevenness is at a level that does not cause any practical problem, but is slightly observed.
X: Image transmission unevenness can be visually observed.

(10) Evaluation of white spots on the image The coated paper on which the solid black image was formed after the fixing process was visually observed in a sufficiently bright room from a position about 30 cm away from the image to determine whether or not white spots had occurred on the image. To evaluate.
：: Almost no white spots on the image were observed.
Δ: White spots on the image were at a level where there was no practical problem, but were slightly observed.
×: White spots on the image can be visually observed.

(11) Evaluation of Peeling Claw Wear Trace A3 size J paper (manufactured by Fuji Xerox Co., Ltd.) is printed on both sides (printed image is 70% monochromatic black density), and the printed surface is visually observed. Evaluate the occurrence of wear marks.
：: Almost no wear mark is observed.
×: Wear marks can be visually observed.

　これらの結果から、実施例１、２、３、４、５、６および比較例１の場合には、比較例２と比較して、ＰＦＡを使用することによって、材料特性値の表面の摩擦係数（対コピー紙）が小さくなり、表面粘着性が低くなり、表面粘着性が著しく改善されていることが判る。材料の特性をシステム特性評価に反映すると、用紙伸び、あばら状画像ずれの抑制ができることが判る。

From these results, in the case of Examples 1, 2, 3, 4, 5, 6 and Comparative Example 1, the use of PFA compared with Comparative Example 2 showed that the coefficient of friction of the surface of the material characteristic value was higher. It can be seen that (vs. copy paper) was reduced, the surface tackiness was reduced, and the surface tackiness was significantly improved. When the characteristics of the material are reflected in the evaluation of the system characteristics, it can be understood that the paper elongation and the rib-shaped image shift can be suppressed.

In the case of Examples 1, 2, 3, 4, 5, and 6, the contact angle of the oil tends to be reduced by adding the filler as compared with Comparative Example 1, and the surface roughness Rz ( Micro concaves) tend to increase. By reducing the contact angle of the oil, the affinity of the material itself with the oil is improved, and further, by increasing the surface roughness Rz (micro concave), the retention of the oil is improved, and both effects are improved. It can be seen that the affinity of the oil was remarkably improved. It can be seen that reflection of the characteristics of the material in the evaluation of the system characteristics can improve the fine pearskin-like unevenness in gloss.

In the case of Examples 1, 2, 3, 4, and 5, compared with Example 6 and Comparative Example 1, reducing the particle size of the added large-diameter powder in PFA, reducing the amount of addition, and lowering the melting point It can be seen that swelling is reduced to a level at which swelling is hardly observed, and that swelling is remarkably improved by using a product having a fine particle size having a low viscosity and increasing the amount of low-viscosity small particle size quality%. It can be seen that when the characteristics of the material are reflected in the evaluation of the system characteristics, it is possible to suppress the transmission unevenness of the OHP image. Further, with respect to Example 6, while the affinity of the material itself to the oil was improved by decreasing the contact angle of the oil, the fine pear-like gross unevenness tended to be good, while large particles of PFA Due to the presence of PFA fine particles with high melt viscosity, some undulations of PFA remain, so the improvement of fine pear-like gross unevenness is slightly inferior due to the replica due to the undulation of PFA, but in practice It turns out that there is no problem. Regarding Comparative Example 1, peeling claw wear marks occurred because the wear resistance of PFA was insufficient.

In the case of Examples 1, 2, 3, 4, and 5, the particle size distribution of the filler particles was reduced to 15% by mass or less as compared with Example 6 in which image white spots in the system characteristics were slightly observed. By doing so, the level of image white spots in the system characteristics is hardly observed, and it can be seen that sharp projections due to the large particle size filler are significantly improved in the surface layer.

In Example 6, since the barium sulfate particles (product having an average particle size of 8 μm) include particles having a large particle size (10% or more of coarse particles having a particle size of 15 μm or more), the surface is slightly localized. It can be seen that some image projections (sharp projections) are generated, which is at a level that does not cause any problem in practical use, but image white spots in the system characteristics are slightly generated.

Examples 1, 2, 3, 4, 5, 6 In particular, in Examples 1, 2, 3, 4, and 5, specific filler particles are blended with PFA, and PFA particle diameters of two different particle diameters It can be seen that each characteristic can be satisfied by controlling the material surface by controlling the compounding amount, the melt viscosity, the particle size of the filler, and the particle size distribution.

As a result, in the fixing part having the surface layer composed of the PFA composition of the example, while having high releasability and durability to the toner, low adhesion to paper, affinity to oil, surface It shows that the shape (surface shape without undulations, sharp projections and micro-concave) can be improved.
[Examples 1-1 to 6-1 and Comparative Examples 1-1 to 2-1]
Based on the characteristics of the PFA composition and the fluororubber composition described above, a fixing endless belt for electrophotography using these PFA compositions was prepared, and the effect of the actual device having the same configuration as the fixing device shown in FIG. 1 was examined. Was.

In addition, using an image forming apparatus (Color Docutech 60 manufactured by Fuji Xerox Co., Ltd.) from which a fixing device has been removed in advance, coated paper and OHP paper having an unfixed image formed on the surface thereof are prepared. The fixing process was performed by using the fixing device.
(Example 1-1)
As a heating roll 1, a fluororubber polyol is placed on a base roll in which a heat-resistant elastic layer 1 b (rubber hardness: 33 °) made of a silicone rubber having high thermal conductivity is formed to a thickness of 3 mm on a hollow metal core bar 1 a made of metal. 95 parts by mass of vulcanization type G-702 (manufactured by Daikin), 5 parts by mass of a compounding agent for rubber, magnesium oxide (manufactured by Kyowa Chemical Co., Ltd.), was coated to a thickness of 30 μm, and the coating was performed at 230 ° C. for 3 hours. Baking was performed, and a release layer 1c was used.

The pressure belt 2 was prepared by coating the PFA composition of Example 1 with a thickness of 30 μm on a polyimide endless belt-like base material and baking it at 380 ° C. for 40 minutes to form a surface layer 2c. Using.

These fixing units are provided with halogen lamps 1d and 2d of 800 W and 250 W, respectively. The surface temperatures of the heating roll 1 and the pressure roll 11 are 170 ° C. and 120 ° C., and the fixing speed is 220 mm / sec. The nip width was set to 10 mm. As a release agent oil supplied to the surface of the heating roll 1 from the release agent applying device 5, a color fuser oil manufactured by Fuji Xerox Co., Ltd. was supplied to the surface of the heating roll 1 in an amount of 1.5 μl / A4 size. A color toner for less oil (Cyan color: CT200010) manufactured by Fuji Xerox Co., Ltd. was used as the toner, and the coated paper (copy paper) was 11 inch × 17 inch double-sided gloss coated paper (Color Xpress Gloss Coated Text 120 gsm, manufactured by Xerox Corporation). ), A4 size OHP paper (V556) manufactured by Fuji Xerox Co., Ltd. was used as the OHP paper. The unfixed toner image formed on the coated paper and the OHP paper manufactured by Fuji Xerox Co., Ltd. is introduced into and passed through the nip area formed by the heating roll 1 and the pressure belt 2, and is fixed by heat and pressure. A fixing test was performed on the sheets. The toner density of the unfixed toner image formed on the coated paper and the OHP paper was 1.5 mg / cm ² .

As a result, during the copy fixing test of 20,000 sheets, no trouble of paper peeling failure from the belt surface occurred at all. No paper elongation occurred on the coated paper.

In addition, fine gloss unevenness during double-sided printing, rib-shaped image shift during high-density image printing, image unevenness on OHP paper, and image whiteout, which are causes of image quality deterioration, are not recognized, and high-quality images can be obtained. did it. Further, even after the fixing test, abrasion by the peeling claw was not recognized on the pressure belt.

(Example 2-1)
Except that the surface layer 2c of the pressure belt 2 in Example 1-1 was coated with the PFA composition of Example 2 to a thickness of 30 μm and baked at 380 ° C. for 40 minutes, heating was performed in exactly the same manner. A roll-belt type fixing device was manufactured. Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 1-1, and the same evaluation was performed.

As a result, during the copy fixing test of 20,000 sheets, no trouble of paper peeling failure from the belt surface occurred at all. No paper elongation occurred on the coated paper.

In addition, fine gloss unevenness during double-sided printing, rib-shaped image shift during high-density image printing, image unevenness on OHP paper, and image whiteout, which are causes of image quality deterioration, are not recognized, and high-quality images can be obtained. did it. Further, even after the fixing test, abrasion by the peeling claw was not recognized on the pressure belt.

(Example 3-1)
Except that the surface layer 2c of the pressure belt 2 in Example 1-1 was coated with the PFA composition of Example 3 to a thickness of 30 μm and baked at 380 ° C. for 40 minutes, heating was performed in exactly the same manner. A roll-belt type fixing device was manufactured. Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 1-1, and the same evaluation was performed.

As a result, during the copy fixing test of 20,000 sheets, no trouble of paper peeling failure from the belt surface occurred at all. No paper elongation occurred on the coated paper.

In addition, fine gloss unevenness during double-sided printing, rib-shaped image shift during high-density image printing, image unevenness on OHP paper, and image whiteout, which are causes of image quality deterioration, are not recognized, and high-quality images can be obtained. did it. Further, even after the fixing test, abrasion by the peeling claw was not recognized on the pressure belt.

(Example 4-1)
Except that the surface layer 2c of the pressure belt 2 in Example 1-1 was coated with the PFA composition of Example 4 to a thickness of 30 μm and baked at 380 ° C. for 40 minutes, heating was performed in exactly the same manner. A roll-belt type fixing device was manufactured. Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 1-1, and the same evaluation was performed.

As a result, during the copy fixing test of 20,000 sheets, no trouble of paper peeling failure from the belt surface occurred at all. No paper elongation occurred on the coated paper.

In addition, fine gloss unevenness during double-sided printing, rib-shaped image shift during high-density image printing, image unevenness on OHP paper, and image whiteout, which are causes of image quality deterioration, are not recognized, and high-quality images can be obtained. did it. Further, even after the fixing test, abrasion by the peeling claw was not recognized on the pressure belt.

Except that the surface layer 2c of the pressure belt 2 in Example 1-1 was coated with the PFA composition of Example 5 to a thickness of 30 μm and baked at 380 ° C. for 40 minutes, heating was performed in exactly the same manner. A roll-belt type fixing device was manufactured. Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 1-1, and the same evaluation was performed.
As a result, during the copy fixing test of 20,000 sheets, no trouble of paper peeling failure from the belt surface occurred at all. No paper elongation occurred on the coated paper.

In addition, fine gloss unevenness during double-sided printing, rib-shaped image shift during high-density image printing, image unevenness on OHP paper, and image whiteout, which are causes of image quality deterioration, are not recognized, and high-quality images can be obtained. did it. Further, even after the fixing test, abrasion by the peeling claw was not recognized on the pressure belt.
Except that the surface layer 2c of the pressure belt 2 in Example 1-1 was coated with the PFA composition of Example 6 to a thickness of 30 μm and baked at 380 ° C. for 40 minutes, heating was performed in exactly the same manner. A roll-belt type fixing device was manufactured. Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 1-1, and the same evaluation was performed.

As a result, during the 20,000-sheet copy-fixing test, there was no occurrence of paper peeling failure from the belt surface, paper elongation, or rib-shaped image shift during high-density image printing.
On the other hand, although the level was not a problem in practical use, slight gloss unevenness during double-sided printing which caused image quality deterioration occurred, and image unevenness on OHP paper was also observed. Similarly, image white spots were slightly generated due to sharp projections of the large-diameter filler (particles having a size of 15 μm or more) in the filler. For this reason, in the case of normal quality, the level is not particularly problematic, but it is slightly inferior to obtaining a high-quality image.

(Comparative Example 1-1)
Except that the surface layer 2c of the pressure belt 2 in Example 1-1 was coated with the PFA composition of Comparative Example 1 to a thickness of 30 μm and baked at 380 ° C. for 40 minutes, heating was performed in exactly the same manner. A roll-belt type fixing device was manufactured. Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 1-1, and the same evaluation was performed.

As a result, during the 20,000-sheet copy-fixing test, there was no occurrence of paper peeling failure from the belt surface, paper elongation, or rib-shaped image shift during high-density image printing.
On the other hand, fine gloss unevenness during double-sided printing, which is a cause of image quality deterioration, occurred, and image unevenness on OHP paper was also observed. For this reason, it was insufficient to obtain a high-quality image.

Further, on the surface of the pressure belt 2 after the fixing test, abrasion occurred on the contact portion of the peeling claw, and abrasion marks occurred on the image of the recorded matter obtained by using the coated paper.
(Comparative Example 2-1)
Except that the surface layer 2c of the pressure belt 2 in Example 1-1 was coated with the fluororubber composition of Comparative Example 2 to a thickness of 180 μm and baked at 230 ° C. for 3 hours, the configuration was completely the same. A heating roll / belt type fixing device was manufactured. Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 1-1, and the same evaluation was performed.

As a result, during the 20,000-sheet copy-fixing test, there was no paper peeling failure from the belt surface, minute gloss unevenness during double-sided printing, and image unevenness on OHP paper, but on the other hand, paper elongation occurred. A rib-shaped image shift occurred during high-density image printing.
[Examples 7 to 11, Comparative Examples 3 to 4]
The fluororesin compositions of the compositions of Examples 7 to 11 shown in Table 3 and Comparative Example 3 shown in Table 4 were DIP-coated to a thickness of 30 µm on a thermosetting polyimide sheet having a thickness of 80 µm, and were heated at 380 ° C. Baking was performed for 40 minutes. The fluororubber composition of Comparative Example 4 shown in Table 4 was coated on a thermosetting polyimide belt sample having a thickness of 80 μm to a thickness of 180 μm and baked at 230 ° C. for 3 hours.

In Examples 7 to 11, polishing was performed four times with polishing paper after the baking (polishing machine: Super finisher manufactured by Matsuda Seiki, polishing paper: imperial wrapping film manufactured by 3M, 30 mic silicon carbide abrasive grain type).

Comparative Example 4 also performed two reciprocations of polishing with a polishing paper after the above-mentioned baking (polishing machine: Super finisher manufactured by Matsuda Seiki, polishing paper: imperial wrapping film 9M silicon carbide abrasive grain type manufactured by 3M).

表面 With respect to the surface of the obtained sheet-like sample, as a material property evaluation, a coefficient of friction with respect to copy paper, a contact angle of pure water and oil, a surface roughness, an undulation, and a surface gloss were measured. Further, using the materials shown in Tables 3 and 4, coating was performed on an endless polyimide belt under the same conditions as on the polyimide sheet sample, and system properties (physical properties at the time of fixing) were evaluated. Uneven image transmission, white spots on the image, and traces of peeling nail wear were evaluated. The evaluation method is shown below. The results are shown in Tables 5 and 6.

　なお、表３及び表４におけるＰＦＡとして、実施例７〜９と比較例３においては、高溶融粘度（２７．０×１０⁴〜２９．０×１０⁴ポイズ；２．７×１０⁴〜２．９×１０⁴Ｐａ・ｓ：３８０℃）の平均粒径０．２μｍＰＦＡと低溶融粘度（３．０×１０⁴ｖ５．０×１０⁴ポイズ；０．３×１０⁴〜０．５×１０⁴Ｐａ・ｓ：３８０℃）の平均粒径１８μｍＰＦＡ粉末の混合タイプ７１０ＣＬ（三井・デュポンフロロケミカル社製）、実施例１０、１１においては、高溶融粘度（２７．０×１０⁴〜２９．０×１０⁴ポイズ；２．７×１０⁴ｖ２．９×１０⁴Ｐａ・ｓ：３８０℃）の平均粒径０．２μｍＰＦＡと低溶融粘度（３．０×１０⁴〜５．０×１０⁴ポイズ；０．３×１０⁴〜０．５×１０⁴Ｐａ・ｓ：３８０℃）の平均粒径８μｍＰＦＡ粉末の混合品配合比、粒径調整タイプ（三井・デュポンフロロケミカル社製）を用いた。なお、表３、４中の粒径の異なる２種のＰＦＡの配合比はＰＦＡ粉末質量部／１００質量部の小粒径ＰＦＡの比から１００質量部ＰＦＡ中のＰＦＡ粉末質量部／小粒径ＰＦＡ質量部の比に換算した。また、充填剤として、実施例７、１０、１１では、簸性硫酸バリウム（堺化学社製：ＢＡ：平均粒径８μｍ、１５μｍ以上の大粒子が１７質量％である）を用いた。実施例８では、ゼオライトトヨビルダー（東ソー社製）を用いた。実施例９では、硫酸バリウム（堺化学社製：ＢＭＨ−６０：平均粒径５μｍ、１５μｍ以上の大粒子が２質量％以下である）とマイカイリオジン１１１（日本メルク社製）を用いた。

As PFA in Tables 3 and 4, in Examples 7 to 9 and Comparative Example 3, high melt viscosity (27.0 × 10 ^{4 to} 29.0 × 10 ⁴ poise; 2.7 × 10 ⁴ to 2) 0.9 × 10 ⁴ Pa · s: 380 ° C.) with an average particle size of 0.2 μm PFA and a low melt viscosity (3.0 × 10 ⁴ v 5.0 × 10 ⁴ poise; 0.3 × 10 ^{4 to} 0.5 × 10 ^{4). In} the mixed type 710CL (manufactured by Du Pont-Mitsui Fluorochemicals Co., Ltd.) of 18 μm PFA powder having an average particle size of 18 μm ( ⁴ Pa · s: 380 ° C.), in Examples 10 and 11, the high melt viscosity (27.0 × 10 ^{4 to} 29.0) × 10 ⁴ poise; 2.7 × 10 ⁴ v2.9 × 10 ⁴ Pa · s: 380 ° C.) Average particle size 0.2 μm PFA and low melt viscosity (3.0 × 10 ^{4 to} 5.0 × 10 ⁴ poise) ^{; 0.3 × 10 4 ~0.5 × 10} 4 Pa · s: 380 ℃) average particle size 8μmPFA powder of If product blending ratio, using a particle size adjustment type (manufactured by Du Pont-Mitsui Fluorochemicals Co., Ltd.). In Tables 3 and 4, the mixing ratio of the two kinds of PFAs having different particle diameters is calculated from the ratio of the PFA powder mass parts / 100 parts by mass small particle diameter PFA to the 100 parts by mass PFA powder mass parts in 100 mass parts PFA / small particle diameter. It was converted to the ratio of PFA parts by mass. Further, in Examples 7, 10 and 11, eluent barium sulfate (manufactured by Sakai Chemical Co., Ltd .: BA: average particle diameter is 8 μm, and large particles having a size of 15 μm or more are 17% by mass) is used as a filler. In Example 8, zeolite Toyo Builder (manufactured by Tosoh Corporation) was used. In Example 9, barium sulfate (manufactured by Sakai Chemical Co., Ltd .: BMH-60: large particles having an average particle size of 5 μm and 15 μm or more is 2% by mass or less) and mykaliodin 111 (manufactured by Nippon Merck Ltd.) were used.

On the other hand, the fluororubber composition of Comparative Example 4 was prepared by blending 5 parts by mass of a rubber compounding agent magnesium oxide (manufactured by Kyowa Chemical Co., Ltd.) with 95 parts by mass of a fluororubber polyol vulcanization type G-702 (manufactured by Daikin). Using these, Lubron L-5F (manufactured by Daikin) was blended as PTFE particles.
-Method of measuring physical properties in Examples and Comparative Examples-
(1) Surface Friction Coefficient Measurement Using a surface friction coefficient measuring instrument HEIDON manufactured by Shinto Kagaku Co., Ltd., the sample is brought into surface contact with copy paper (Color Xpression Gloss Coated Text 120gsm: double-sided coated paper manufactured by Xerox Corporation), and the copy paper is copied. Was measured, the sample was fixed, and the measurement was performed under the conditions of a load of 150 g and a moving speed of 5 mm / sec.
：: coefficient of friction ≦ 0.45
×: coefficient of friction> 0.45
(2) Surface contact angle measurement (contact angle of pure water and oil)
Contact angle of pure water: Using a surface contact angle measuring device manufactured by Kyowa Interface Science Co., Ltd., a droplet of ion-exchanged water was dropped on the sample surface, and the contact angle between the droplet and the sample surface was measured from the side.

Oil contact angle: After immersing the sample in fuser oil (manufactured by Fuji Xerox Co., Ltd.) for 2 hours using a surface contact angle measuring device manufactured by Kyowa Interface Science Co., Ltd., wipe off the fuser oil on the sample surface with acetone. (Set temperature: 180 ° C., measured temperature: 170 ° C.), an oil drop of fuser oil was dropped on the sample surface, and the contact angle between the oil drop and the sample surface was measured from the side.
(3) Surface roughness measurement Using a surface roughness measuring device (Model No. 1400A) manufactured by Tokyo Seimitsu Co., Ltd., a measuring element was brought into contact with the sample surface with a load of 0.07 g, and a traverse speed of 0.03 mm / sec. It was moved by 0.0 mm and measured. The measurement magnification was set to 50 in the horizontal direction and 5000 in the vertical direction, and the ten-point average roughness (Rz) was determined.
(4) Filtering center line undulation Wa measurement Using a surface roughness measuring device (Model No. 1400A) manufactured by Tokyo Seimitsu Co., Ltd., a probe is brought into contact with the sample surface with a load of 0.07 g, and a traverse speed of 0.3 mm / sec. And moved by 8 mm for measurement (based on JIS94). The measurement magnification was set to horizontal direction × 20 and vertical direction × 2000.
：: Wa ≦ 0.9 mm (almost no swell is observed)
×: Wa> 0.9 mm (undulation can be visually observed)
(5) Surface gloss measurement Using a micro gloss meter manufactured by Gardner Co., Ltd., the micro gloss meter was brought into close contact with the sample surface, and the measurement was performed under the conditions of an incident / reflection angle of 75 ° / 75 °.

(6) Evaluation of paper elongation The paper feeding direction of double coated paper (Color Xpression Gloss Coated Text 120gsm: double coated paper manufactured by Xerox Corporation) after the fixing process so that the paper feeding direction and the longitudinal direction of the paper are parallel. The elongation of the paper in the longitudinal direction) is measured. The case where the amount of elongation of the paper is 2 mm or more is judged to be a level that poses a practical problem.
：: paper elongation <2 mm.
X: The amount of elongation of the paper ≧ 2 mm.

(7) Evaluation of rib-like image quality deviation Halftone single-color black (50% density) image was printed on one side of A3 size OK TOP coated paper (Oji Paper, 127.9 g / m ² basis weight) and visually observed. To check whether a rose pattern is generated on the printing surface.
：: The rose pattern is hardly observed.
X: The rose pattern can be visually observed.

(8) Evaluation of fine satin-like gross unevenness The coated paper on which the solid black image was formed after the fixing treatment was visually observed from a place approximately 30 cm away from the image in a sufficiently bright room, and compared with a comparative sample. The presence or absence of gross unevenness and the degree of occurrence are confirmed by the following.
：: Gloss unevenness is hardly observed.
Δ: No uneven gloss is observed at a glance, but uneven gloss can be observed by reflecting the surface on which the image is formed to a light source.
×: A level at which uneven gloss can be observed at a glance.

(9) Evaluation of OHP Image Transmission Unevenness An OHP sheet (V556) on which a solid image of 20 mm × 20 mm was formed for each color of cyan, magenta and yellow was projected on a screen by an OHP machine, and this projected image was separated by 3 m. The presence or absence of image transmission unevenness is evaluated by visual observation.
：: Image transmission unevenness is hardly observed.
Δ: Image transmission unevenness is at a level that does not cause any practical problem, but is slightly observed.
X: Image transmission unevenness can be visually observed.

(10) Evaluation of white spots on the image The coated paper on which the solid black image was formed after the fixing process was visually observed in a sufficiently bright room from a position about 30 cm away from the image to determine whether or not white spots had occurred on the image. To evaluate.
：: Almost no white spots on the image were observed.
Δ: White spots on the image were at a level where there was no practical problem, but were slightly observed.
×: White spots on the image can be visually observed.

(11) Evaluation of Peeling Claw Wear Trace A3 size J paper (manufactured by Fuji Xerox Co., Ltd.) is printed on both sides (printed image is 70% monochromatic black density), and the printed surface is visually observed. Evaluate the occurrence of wear marks.
：: Almost no wear mark is observed.
×: Wear marks can be visually observed.

　これらの結果から、実施例７〜１１および比較例３の場合には、比較例４と比較して、ＰＦＡを使用することによって、表面の摩擦係数（対コピー紙）が低下し、表面粘着性が低くなり、表面粘着性が著しく改善されていることが判る。材料特性をシステム特性評価に反映すると、用紙伸び、あばら状画像ずれの抑制ができることが判る。

From these results, in Examples 7 to 11 and Comparative Example 3, compared with Comparative Example 4, the use of PFA resulted in a decrease in the coefficient of friction of the surface (with respect to copy paper) and an increase in the surface tackiness. And the surface tackiness is remarkably improved. It can be seen that when the material characteristics are reflected in the system characteristic evaluation, paper elongation and rib-shaped image shift can be suppressed.

In the case of Examples 7 to 11, as compared with Comparative Example 3, the addition of the filler tends to reduce the oil contact angle, and the oil contact angle decreases, thereby reducing the material itself. It can be seen that the affinity for oil has been improved.

In Examples 7 to 11 and Comparative Example 3, small PFA particles having a high melt viscosity were used, and PFA powder was compounded in an amount of 40 parts by mass or more. In Examples 7 to 9 and Comparative Example 3, larger PFA particles were used. Since PFA powder (18 μm) having a particle size is also compounded, undulation is slightly generated in the surface layer material. In addition, in the case of Examples 7, 10 and 11, the added barium sulfate particles (product having an average particle size of 8 μm) include those having a large particle size (10% or more of coarse particles having a size of 15 μm or more). Therefore, local protrusions (sharp protrusions) are slightly generated on the surface. It can be seen that in Examples 7 to 11, the undulation (Wa) was reduced and the undulation was significantly improved by polishing in the post-processing, as compared with Comparative Example 3 in which the post-processing was not performed. In particular, Example 7 uses the same fluororesin composition as in Example 6 described above, but it can be seen that swell (Wa) is reduced and swell is significantly improved by performing post-processing. . It can be seen that when the material characteristics are reflected in the evaluation of the system characteristics, the transmission unevenness of the OHP image can be suppressed. In addition, image white spots in the system characteristics of Examples 7, 10, and 11 were at a level that was hardly observed by the post-processing polishing. It can be seen that the projections) are significantly improved.

In Example 7, compared to Example 6 described above, polishing is performed four times with abrasive paper, thereby eliminating local protrusions, and also reducing the undulation (Wa) of the surface by polishing, thereby reducing undulation (Wa). You can see that. In Examples 10 and 11, the swell can be further improved by changing the particle size of the PFA powder to be added from 18 μm to 8 μm. In addition, it can be seen that in Example 10, the amount of PFA powder (8 μm) added was smaller than in Example 11, so that the undulation Wa was slightly reduced.

By controlling the abrasive grains of the abrasive paper (30 mic abrasive grains) to create a surface with a constant roughness (micro concave), Examples 7 to 11 have a constant roughness compared to Comparative Example 3. It can be seen that the surface shape has a property of retaining oil. In addition, the contact angle of water of Examples 7 to 11 was 110 ° or more, and it was found that the toner had high releasability from the toner.

に 関 し て In Comparative Example 4, peeling claw wear marks were generated because the wear resistance of PFA was insufficient.

As a result, in the fixing part having the surface layer composed of the PFA composition of the example, while having high releasability and durability to the toner, low adhesion to paper, affinity to oil, surface It shows that the shape (surface shape without undulations, sharp projections and micro-concave) can be improved.
[Examples 7-1 to 11-1, Comparative Examples 3-1 to 4-1]
Based on the characteristics of the PFA composition described above, an endless belt for electrophotography using these PFA compositions was produced, and the effect of an actual machine having the same configuration as the fixing device shown in FIG. 1 was examined.

In addition, using an image forming apparatus (Color Docutech 60 manufactured by Fuji Xerox Co., Ltd.) from which a fixing device has been removed in advance, coated paper and OHP paper having an unfixed image formed on the surface thereof are prepared. The fixing process was performed by using the fixing device.
(Example 7-1)
As a heating roll 1, a fluororubber polyol is placed on a base roll in which a heat-resistant elastic layer 1 b (rubber hardness: 33 °) made of a silicone rubber having high thermal conductivity is formed to a thickness of 3 mm on a hollow metal core bar 1 a made of metal. 95 parts by mass of vulcanization type G-702 (manufactured by Daikin), 5 parts by mass of a compounding agent for rubber, magnesium oxide (manufactured by Kyowa Chemical Co., Ltd.), was coated to a thickness of 30 μm, and the coating was performed at 230 ° C. for 3 hours. Baking was performed, and a release layer 1c was used.

As the pressure belt 2, the PFA composition of Example 7 was coated on a polyimide endless belt-shaped base material to a thickness of 30 μm, baked at 380 ° C. for 40 minutes, and then polished with polishing paper (polishing). Machine: Super finisher manufactured by Matsuda Seiki, polishing paper: Imperial wrapping film made of 3M, 30 mic silicon carbide abrasive grains type) (4 reciprocations) was used to form a surface layer 2c.

These fixing units are provided with halogen lamps 1d and 2d of 800 W and 250 W, respectively. The surface temperatures of the heating roll 1 and the pressure roll 11 are 170 ° C. and 120 ° C., and the fixing speed is 220 mm / sec. The nip width was set to 10 mm. Further, as a release agent oil supplied to the surface of the heating roll 1 from the release agent application device 5, a color fuser oil manufactured by Fuji Xerox Co., Ltd. was supplied to the surface of the fixing roll in an amount of 1.5 μl / A4 size. A color toner for less oil (Cyan color: CT200010) manufactured by Fuji Xerox Co., Ltd. was used as the toner, and the coated paper (copy paper) was 11 inch × 17 inch double-sided gloss coated paper (Color Xpress Gloss Coated Text 120 gsm, manufactured by Xerox Corporation). ), A4 size OHP paper (V556) manufactured by Fuji Xerox Co., Ltd. was used as the OHP paper. The unfixed toner image formed on the coated paper and the OHP paper manufactured by Fuji Xerox Co., Ltd. is introduced into and passed through the nip area formed by the heating roll 1 and the pressure belt 2, and is fixed by heat and pressure. A fixing test was performed on the sheets. The toner density of the unfixed toner image formed on the coated paper and the OHP paper was 1.5 mg / cm ² .

As a result, during the copy fixing test of 20,000 sheets, no trouble of paper peeling failure from the belt surface occurred at all. No stretching of the paper occurred on the coated paper.

In addition, fine gloss unevenness during double-sided printing, rib-shaped image shift during high-density image printing, image unevenness on OHP paper, and image whiteout, which are causes of image quality deterioration, are not recognized, and high-quality images can be obtained. did it. Further, even after the fixing test, abrasion by the peeling claw was not recognized on the pressure belt.

(Example 8-1)
The surface layer 2c of the pressure belt 2 in Example 7-1 was coated with the PFA composition of Example 8 to a thickness of 30 μm, baked at 380 ° C. for 40 minutes, and then polished with polishing paper (polishing machine). : A heated roll / belt type fixing device having exactly the same configuration as that described above, except that four reciprocations of a super finisher manufactured by Matsuda Seiki and an abrasive paper: an imperial wrapping film made of 3M, 30 mic silicon carbide abrasive grains) were performed. Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 7-1, and the same evaluation was performed.

As a result, during the copy fixing test of 20,000 sheets, no trouble of paper peeling failure from the belt surface occurred at all. No paper elongation occurred on the coated paper.

In addition, fine gloss unevenness during double-sided printing, rib-shaped image shift during high-density image printing, image unevenness on OHP paper, and image whiteout, which are causes of image quality deterioration, are not recognized, and high-quality images can be obtained. did it. Further, even after the fixing test, abrasion by the peeling claw was not recognized on the pressure belt.
(Example 9-1)
The surface layer 2c of the pressure belt 2 in Example 7-1 was coated with the PFA composition of Example 9 to a thickness of 30 μm, baked at 380 ° C. for 40 minutes, and then polished with polishing paper (polishing machine). : A heated roll / belt type fixing device having exactly the same configuration as that described above, except that four reciprocations of a super finisher manufactured by Matsuda Seiki and an abrasive paper: an imperial wrapping film made of 3M, 30 mic silicon carbide abrasive grains) were performed. Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 7-1, and the same evaluation was performed.

As a result, during the copy fixing test of 20,000 sheets, no trouble of paper peeling failure from the belt surface occurred at all. No paper elongation occurred on the coated paper.

In addition, fine gloss unevenness during double-sided printing, rib-shaped image shift during high-density image printing, image unevenness on OHP paper, and image whiteout, which are causes of image quality deterioration, are not recognized, and high-quality images can be obtained. did it. Further, even after the fixing test, abrasion by the peeling claw was not recognized on the pressure belt.
(Example 10-1)
The surface layer 2c of the pressure belt 2 in Example 7-1 was coated with the PFA composition of Example 10 to a thickness of 30 μm, baked at 380 ° C. for 40 minutes, and then polished with polishing paper (polishing machine). : A heated roll / belt type fixing device having exactly the same configuration as that described above, except that four reciprocations of a super finisher manufactured by Matsuda Seiki and an abrasive paper: an imperial wrapping film made of 3M, 30 mic silicon carbide abrasive grains) were performed. Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 7-1, and the same evaluation was performed.

As a result, during the copy fixing test of 20,000 sheets, no trouble of paper peeling failure from the belt surface occurred at all. No paper elongation occurred on the coated paper.

In addition, fine gloss unevenness during double-sided printing, rib-shaped image shift during high-density image printing, image unevenness on OHP paper, and image whiteout, which are causes of image quality deterioration, are not recognized, and high-quality images can be obtained. did it. Further, even after the fixing test, abrasion by the peeling claw was not recognized on the pressure belt.
(Example 11-1)
The surface layer 2c of the pressure belt 2 in Example 7-1 was coated with the PFA composition of Example 11 to a thickness of 30 μm, and then polished with polishing paper (polishing machine: Super Finisher manufactured by Matsuda Seiki, polishing paper). : A heating roll / belt type fixing apparatus having exactly the same configuration as that of the above-described embodiment was performed except that four reciprocations of a 3M imperial wrapping film (30 mic silicon carbide abrasive grain type manufactured by 3M) were performed. Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 7-1, and the same evaluation was performed.

As a result, during the copy fixing test of 20,000 sheets, no trouble of paper peeling failure from the belt surface occurred at all. No paper elongation occurred on the coated paper.

In addition, fine gloss unevenness during double-sided printing, rib-shaped image shift during high-density image printing, image unevenness on OHP paper, and image whiteout, which are causes of image quality deterioration, are not recognized, and high-quality images can be obtained. did it. Further, even after the fixing test, abrasion by the peeling claw was not recognized on the pressure belt.
(Comparative Example 3-1)
Except that the surface layer 2c of the pressure belt 2 in Example 7-1 was coated with the PFA composition of Comparative Example 3 to a thickness of 30 μm and baked at 380 ° C. for 40 minutes, the heating was performed in exactly the same configuration. A roll-belt type fixing device was manufactured. Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 7-1, and the same evaluation was performed.

As a result, during the 20,000-sheet copy fixing test, there was no paper peeling failure from the belt surface, paper elongation, or rib-shaped image shift during high-density image printing, but during double-sided printing that adversely affected high image quality. Of the belt side image, and uneven transmission of the OHP image occurred at an unacceptable level. After the fixing test, wear marks were formed on the pressure belt due to the peeling nails, and wear marks were formed on the belt side image during double-sided printing.
(Comparative Example 4-1)
The surface layer 2c of the pressure belt 2 in Example 7-1 was coated with the fluororubber composition of Comparative Example 4 to a thickness of 180 μm, baked at 230 ° C. for 3 hours, and then polished with polishing paper (polishing machine). : A heated roll / belt type fixing device having exactly the same configuration as that of the above, except that a super finisher manufactured by Matsuda Seiki and an abrasive paper: an imperial wrapping film made of 3M, 9 mic silicon carbide abrasive grains) were performed twice. Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 7-1, and the same evaluation was performed.

As a result, during the 20,000-sheet copy fixing test, there was no occurrence of paper peeling failure from the belt surface, minute gloss unevenness during double-sided printing, and image unevenness on OHP paper, but the paper elongation with respect to the above-described coated paper was large, The size was a problem in practical use. Also, fine gloss unevenness did not occur in the belt-side image during double-sided printing, but rose-shaped image shift occurred during high-density image printing.
[Examples 12 to 16, Comparative Examples 5 to 6]
The fluororesin compositions of the compositions of Examples 12 to 16 shown in Table 7 and Comparative Example 5 shown in Table 8 were DIP-coated to a thickness of 30 μm on a thermosetting polyimide belt having a thickness of 80 μm, and heated at 380 ° C. Baking was performed for 40 minutes. The fluororubber composition of Comparative Example 6 shown in Table 8 was coated on a thermosetting polyimide belt sample having a thickness of 80 μm to a thickness of 180 μm and baked at 230 ° C. for 3 hours.

In Examples 12 and 13, after the baking, polishing with polishing paper was performed four reciprocations, respectively. In Examples 14, 15, and 16, after the baking, polishing with polishing paper was performed one reciprocation, four reciprocations, three reciprocations, respectively. (Polishing machine: Super finisher manufactured by Matsuda Seiki, polishing paper: imperial wrapping film 30 mic silicon carbide abrasive grain type manufactured by 3M). Further, in Example 16, after polishing, baking was performed again at 380 ° C. for 40 minutes.

Comparative Example 6 also performed two reciprocations of polishing with polishing paper after the above-mentioned baking (polishing machine: Matsuda Seiki Super Finisher, polishing paper: 3M imperial wrapping film 製 9 mic silicon carbide abrasive grain type).

With respect to the surfaces of these obtained belt-shaped samples, as a material property, a coefficient of friction (relative to copy paper), surface roughness, surface undulation, surface gloss, and contact angle with an amine-modified silicone oil at 170 ° C. were measured. . As the evaluation of the system characteristics (physical properties at the time of fixing), elongation of paper, irregular image quality, irregularity of OHP image transmission, white spots on images, and traces of peeling claw wear were evaluated. The evaluation method is shown below. The results are shown in Tables 9 and 10.

　なお、表７及び表８における、実施例１２、１３には、低溶融粘度（３．０×１０⁴〜５．０×１０⁴ポイズ；０．３×１０⁴〜０．５×１０⁴Ｐａ・ｓ：３８０℃）の平均粒径０．２μｍのＰＦＡを水系溶媒中に分散させたＰＦＡディスパージョンに、低溶融粘度（３．０×１０⁴〜５．０×１０⁴ポイズ；０．３×１０⁴〜０．５×１０⁴Ｐａ・ｓ：３８０℃）の平均粒径８μｍのＰＦＡ粉末を混合した（ＰＦＡ粉末／ＰＦＡ微粒子＝１５／８５）フッ素樹脂溶液（三井・デュポンフロロケミカル社製）を用い、実施例１４〜１６と比較例５には、高溶融粘度（２７．０×１０⁴〜２９．０×１０⁴ポイズ；２．７×１０⁴〜２．９×１０⁴Ｐａ・ｓ：３８０℃）の平均粒径０．２μｍＰＦＡと低溶融粘度（３．０×１０⁴〜５．０×１０⁴ポイズ；０．３×１０⁴〜０．５×１０⁴Ｐａ・ｓ：３８０℃）の平均粒径１８μｍＰＦＡ粉末の混合タイプ７１０ＣＬ（三井・デュポンフロロケミカル社製）を用いた。なお、表７、８中の粒径の異なる２種のＰＦＡの配合比はＰＦＡ粉末質量部／１００質量部の小粒径ＰＦＡの比から１００質量部ＰＦＡ中のＰＦＡ粉末質量部／小粒径ＰＦＡ質量部の比に換算した。

Examples 12 and 13 in Tables 7 and 8 have low melt viscosities (3.0 × 10 ^{4 to} 5.0 × 10 ⁴ poise; 0.3 × 10 ^{4 to} 0.5 × 10 ⁴ Pa). A low melt viscosity (3.0 × 10 ^{4 to} 5.0 × 10 ⁴ poise; 0.3 μs) was added to a PFA dispersion in which PFA having an average particle size of 0.2 μm (s: 380 ° C.) was dispersed in an aqueous solvent. Fluororesin solution (PFA powder / PFA fine particles = 15/85) mixed with a PFA powder having an average particle size of 8 μm (× 10 ^{4 to} 0.5 × 10 ⁴ Pa · s: 380 ° C.) (manufactured by DuPont-Mitsui Fluorochemicals Co., Ltd.) ), The high melt viscosity (27.0 × 10 ^{4 to} 29.0 × 10 ⁴ poise; 2.7 × 10 ^{4 to} 2.9 × 10 ⁴ Pa ·) was used in Examples 14 to 16 and Comparative Example 5. s: average particle size 0.2μmPFA and low melt viscosity of ^{380 ℃) (3.0 × 10 4} ~5.0 × 10 4 poise; 0 ^{3 × 10 4 ~0.5 × 10 4} Pa · s: Compound type average particle size 18μmPFA powder 380 ℃) 710CL (manufactured by Du Pont-Mitsui Fluorochemicals Co., Ltd.) was used. The mixing ratio of the two types of PFA having different particle diameters in Tables 7 and 8 is calculated from the ratio of PFA powder mass part / 100 parts by mass small particle size PFA to 100 parts by mass PFA powder mass part in PFA / small particle size. It was converted to the ratio of PFA parts by mass.

Examples 12 and 13 used barium sulfate (manufactured by Sakai Chemical Co., Ltd .: BMH-60: average particle size is 5 μm, and large particles having a size of 15 μm or more are 2% by mass or less) as fillers. , Barium sulfate (manufactured by Sakai Chemical Co., Ltd .: BA: average particle size is 8 μm, and large particles having a size of 15 μm or more are 17% by mass), and in Example 13, carbon black (here, a mixture of PFA and carbon black ( Mitsui DuPont Fluorochemicals)) was used.

In Comparative Example 6, 5 parts by mass of a rubber compounding material (magnesium oxide, manufactured by Kyowa Chemical Industry Co., Ltd.) was blended with 95 parts by mass of a polyol vulcanized fluorinated rubber (G-702 manufactured by Daikin Co., Ltd.). Fine particles (PTFE particles) mixed with Lubron L-5F (manufactured by Daikin Industries, Ltd.) were used.
-Method of measuring physical properties in Examples and Comparative Examples-
(1) Surface Friction Coefficient Measurement Using a surface friction coefficient measuring instrument HEIDON manufactured by Shinto Kagaku Co., Ltd., the sample is brought into surface contact with copy paper (Color Xpression Gloss Coated Text 120gsm: double-sided coated paper manufactured by Xerox Corporation), and the copy paper is copied. Was measured, the sample was fixed, the load was 150 g, and the moving speed was 5 mm / sec. The static friction coefficient at that time was used as a representative value.

(2) Measurement of Surface Roughness (Ten-Point Average Roughness Rz) Using a surface roughness measuring device (Model No. 1400A) manufactured by Tokyo Seimitsu Co., Ltd., a measuring element was brought into contact with the sample surface under a load of 0.07 g, and the traverse speed was 0. It was moved by 4 mm at 0.03 mm / sec and measured (based on JIS94). The measurement magnification was set to 50 in the horizontal direction and 5000 in the vertical direction.

(3) Filtering center line undulation Wa measurement Using a surface roughness measuring device (model number 1400A) manufactured by Tokyo Seimitsu Co., Ltd., a measuring element was brought into contact with the sample surface with a load of 0.07 g, and a traverse speed of 0.3 mm / sec. And moved by 8 mm (based on JIS94). The measurement magnification was set to horizontal direction × 20 and vertical direction × 2000.

(4) Surface gloss measurement Using a micro gloss meter manufactured by Gardner Co., Ltd., the micro gloss meter was brought into close contact with the sample surface, and the measurement was performed under the conditions of incident / reflection angle: 75 ° / 75 °.

(5) Surface contact angle measurement (170 ° C, amine-modified silicone oil)
Using a surface contact angle measurement device manufactured by Kyowa Interface Science Co., Ltd., an amine-modified silicone oil (Fuji Xerox Co., Ltd. color fuser oil: W418) was dropped on the sample surface heated to 170 ° C. Was measured from the side.

(6) Evaluation of paper elongation The paper feeding direction of double coated paper (Color Xpression Gloss Coated Text 120gsm: double coated paper manufactured by Xerox Corporation) after the fixing process so that the paper feeding direction and the longitudinal direction of the paper are parallel. The elongation of the paper in the longitudinal direction) is measured. The case where the amount of elongation of the paper is 2 mm or more is judged to be a level that poses a practical problem.
：: paper elongation <2 mm.
X: The amount of elongation of the paper ≧ 2 mm.

(7) Evaluation of rib-like image quality deviation Halftone single-color black (50% density) image was printed on one side of A3 size OK TOP coated paper (Oji Paper, 127.9 g / m ² basis weight) and visually observed. To check whether a rose pattern is generated on the printing surface.
：: The rose pattern is hardly observed.
X: The rose pattern can be visually observed.

(8) Evaluation of fine satin-like gross unevenness The coated paper on which the solid black image was formed after the fixing treatment was visually observed from a place approximately 30 cm away from the image in a sufficiently bright room, and compared with a comparative sample. The presence or absence of gross unevenness and the degree of occurrence are confirmed by the following.
：: Gloss unevenness is hardly observed.
Δ: No uneven gloss is observed at a glance, but uneven gloss can be observed by reflecting the surface on which the image is formed to a light source.
×: A level at which uneven gloss can be observed at a glance.

(9) Evaluation of OHP Image Transmission Unevenness An OHP sheet (V556) on which a solid image of 20 mm × 20 mm was formed for each color of cyan, magenta and yellow was projected on a screen by an OHP machine, and this projected image was separated by 3 m. The presence or absence of image transmission unevenness is evaluated by visual observation.
：: Image transmission unevenness is hardly observed.
Δ: Image transmission unevenness is at a level that does not cause any practical problem, but is slightly observed.
X: Image transmission unevenness can be visually observed.

(10) Evaluation of white spots on the image The coated paper on which the solid black image was formed after the fixing process was visually observed in a sufficiently bright room from a position about 30 cm away from the image to determine whether or not white spots had occurred on the image. To evaluate.
：: Almost no white spots on the image were observed.
Δ: White spots on the image were at a level where there was no practical problem, but were slightly observed.
×: White spots on the image can be visually observed.

(11) Evaluation of Peeling Claw Wear Trace A3 size J paper (manufactured by Fuji Xerox Co., Ltd.) is printed on both sides (printed image is 70% monochromatic black density), and the printed surface is visually observed. Evaluate the occurrence of wear marks.
：: Almost no wear mark is observed.
×: Wear marks can be visually observed.

　これらの結果より、比較例６とその他を比べると、比較例６はコート紙に対する摩擦係数が非常に高く、用紙との密着性が高いことが判る。

From these results, comparing Comparative Example 6 with the others, it can be seen that Comparative Example 6 has a very high coefficient of friction on coated paper and high adhesion to paper.

Examples 14, 15, and 16 use the same PFA composition as in Example 6 described above, but differ in the presence or absence of post-processing. In the fourteenth embodiment, by performing polishing once with abrasive paper, local protrusions were eliminated, the surface roughness was reduced, and the undulation of the surface was also improved by polishing, and the filtering center line undulation Wa was reduced. You can see that it is. In Example 15, as compared with Example 14, by increasing the number of times of polishing, the surface undulation component was further reduced, and the filtering center line undulation Wa was further reduced. Further, in Example 16, the surface waviness and local protrusions were eliminated by polishing three times with abrasive paper, and the surface was further refired to form a surface (micro concave) having a constant roughness by firing. It turns out that it is.

Comparative Example 5 does not contain filler particles, so that the contact angle with oil is high, the affinity for oil is inferior to other oils, and the surface of the fluororesin alone is uniform. It can be seen that the surface roughness is small and the surface gloss is high.

Example 12 is different from Example 6 in that the particle size of the added PFA powder in the PFA dispersion was reduced, the melt viscosity of the PFA fine particles was reduced, and the blending amount was increased. The undulation of the filter center line is improved while the coated surface remains as it is, and the surface projections can also be improved by reducing the particle size and particle size distribution of the added barium sulfate particles.

Example 13 shows that the same physical properties as in Example 12 can be obtained even when carbon of conductive particles is added as filler particles. Regarding the materials of Examples 12 and 13, each required characteristic can be satisfied only by controlling the material, and each required characteristic can be satisfied by performing post-processing.

As a result, in the pressure belt having the surface layer made of the PFA composition containing the filler particles of Examples 12 to 16, the surface non-adhesiveness was maintained while maintaining high releasability and durability from the toner. , The affinity with oil and the surface shape (surface shape with small undulations and protrusions and minute roughness) can be improved.
[Examples 12-1 to 16-1, Comparative Examples 5-1 to 6-1]
Based on the characteristics of the PFA composition described above, an endless belt for electrophotography using these PFA compositions was produced, and the effect of an actual machine having the same configuration as the fixing device shown in FIG. 1 was examined.

In addition, using an image forming apparatus (Color Docutech 60 manufactured by Fuji Xerox Co., Ltd.) from which a fixing device has been removed in advance, coated paper and OHP paper having an unfixed image formed on the surface thereof are prepared. The fixing process was performed by using the fixing device.
(Example 12-1)
As the heating roll 1, a base roll in which a heat-resistant elastic layer 1b (rubber hardness 33 °) made of silicone rubber having high thermal conductivity is formed to a thickness of 1.5 mm on a hollow metal core 1a made of metal having a diameter of 62 mm. A rubber composition obtained by blending 5 parts by mass of magnesium oxide (manufactured by Kyowa Chemical Co., Ltd.) as a compounding material for rubber with 95 parts by mass of a polyol-based vulcanization type fluororubber (manufactured by Daikin Industries, Ltd .: G-702) The product was coated to a thickness of 30 μm and baked at 230 ° C. for 3 hours to form a release layer 1c.

As the pressure belt 2, the fluororesin composition of Example 12 was coated on a thermosetting polyimide endless belt-shaped base substrate having a length of 340 mm and a circumference of 213.3 mm to a thickness of 30 μm. After baking for 40 minutes, polishing with a polishing paper (polishing machine: Super finisher manufactured by Matsuda Seiki, polishing paper: imperial wrapping film manufactured by 3M @ 30 mic silicon carbide abrasive grain type) was performed four times to form a release layer 2c. Was used.

These fixing units are provided with 800 W and 250 W halogen lamps 1d and 2d, respectively. The surface temperatures of the heating roll 1 and the supporting roll 10 are 170 ° C. and 120 ° C., respectively, and the fixing speed is 264 mm / sec. The nip width at the pressure pad 12 was set at 10 mm, and the nip width at the pressure roll 11 was set at 4 mm. Further, as a release agent oil supplied from the release agent application device 5, a color fuser oil (model number: W418) manufactured by Fuji Xerox Co., Ltd. was supplied to the fixing roll surface in an amount of 1.5 μl / A4 size.

As the recording material 3 used for the fixing process, coated paper and OHP paper on which an unfixed toner image was formed on one side in advance were used. A color toner for less oil (Cyan color: CT200010) manufactured by Fuji Xerox Co., Ltd. was used as the toner, and the coated paper was 11 inch × 17 inch double-sided gloss coated paper (Color Xpression Gloss Coated Text 120 gsm) manufactured by Xerox Corporation and the OHP. A4 size OHP paper (V556) manufactured by Fuji Xerox Co., Ltd. was used as the paper. The unfixed toner image formed on the coated paper and the OHP paper is introduced into and passed through a nip region formed by the heating roll 1 and the pressure belt 2, and is fixed by heat and pressure. And the elongation of the paper was evaluated. Incidentally, the toner density of the unfixed toner image was 0.9 mg / cm ² .

As a result, during the copy fixing test of 20,000 sheets, no trouble of paper peeling failure from the belt surface occurred at all. The paper elongation was up to 1.0 mm in the longitudinal direction of the coated paper of Xerox Corporation made of 11 × 17 inch size (Color Xpression Gloss Coated Text 120 gsm: double-coated paper made by Xerox Corporation). In addition, no rib-shaped image shift, image unevenness due to OHP, or blackening of the edge portion at the time of high-density image printing, which adversely affects high image quality, were observed. , High image quality. Further, even after the fixing test, abrasion by the peeling claw was not recognized on the pressure belt.
(Example 13-1)
As the heating roll 1, a base having a heat-resistant elastic layer 1 b (rubber hardness: 33 °) made of silicone rubber having high thermal conductivity formed on a hollow metal core 1 a made of metal having a diameter of 62 mm and having a thickness of 1.5 mm. A rubber in which 5 parts by mass of magnesium oxide (manufactured by Kyowa Chemical Industry Co., Ltd.) was compounded as a compounding material for rubber with respect to 95 parts by mass of a polyol-based vulcanization type fluororubber (manufactured by Daikin Industries, Ltd .: G-702) on a roll. The composition was coated to a thickness of 30 μm and baked at 230 ° C. for 3 hours to form a release layer 1c.

As the pressure belt 2, the fluororesin composition of Example 13 was coated on a thermosetting polyimide endless belt-shaped base substrate having a length of 340 mm and a circumference of 213.3 mm to a thickness of 30 μm, and heated at 380 ° C. Exactly the same configuration except that baking was performed for 40 minutes, and then polishing with polishing paper (polishing machine: Super finisher manufactured by Matsuda Seiki, polishing paper: imperial wrapping film manufactured by 3M @ 30mic silicon carbide abrasive grain type) was performed four times. A belt-type fixing device was manufactured.

(4) Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 12-1, and the same evaluation was performed.

As a result, during the copy fixing test of 20,000 sheets, no trouble of paper peeling failure from the belt surface occurred at all. The paper elongation was 0.9 mm at the maximum in the longitudinal direction of the coated paper of Xerox Corporation having a size of 11 × 17 inch (Color Xpression Gloss Coated Text 120 gsm: double-coated paper manufactured by Xerox Corporation). In addition, no rib-shaped image deviation during printing of high-density images that adversely affects high image quality, image transmission unevenness with OHP, and blackening of the edge portion were not recognized, and there was no problem with minute gloss unevenness on the belt side image during double-sided printing. , High image quality. Further, even after the fixing test, abrasion by the peeling claw was not recognized on the pressure belt.
(Example 14-1)
As the heating roll 1, a base having a heat-resistant elastic layer 1 b (rubber hardness: 33 °) made of silicone rubber having high thermal conductivity formed on a hollow metal core 1 a made of metal having a diameter of 62 mm and having a thickness of 1.5 mm. A rubber in which 5 parts by mass of magnesium oxide (manufactured by Kyowa Chemical Industry Co., Ltd.) was compounded as a compounding material for rubber with respect to 95 parts by mass of a polyol-based vulcanization type fluororubber (manufactured by Daikin Industries, Ltd .: G-702) on a roll. The composition was coated to a thickness of 30 μm and baked at 230 ° C. for 3 hours to form a release layer 1c.

As the pressure belt 2, the fluororesin composition of Example 14 was coated on a thermosetting polyimide endless belt-shaped base substrate having a length of 340 mm and a circumference of 213.3 mm to a thickness of 30 μm, and heated at 380 ° C. Exactly the same configuration except that baking was performed for 40 minutes, and then polishing with a polishing paper (polishing machine: Super finisher manufactured by Matsuda Seiki, polishing paper: imperial wrapping film manufactured by 3M @ 30 mic silicon carbide abrasive grain type) was performed once. A belt-type fixing device was manufactured.

(4) Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 12-1, and the same evaluation was performed.

As a result, during the copy fixing test of 20,000 sheets, no trouble of paper peeling failure from the belt surface occurred at all. The paper elongation was 1.0 mm at maximum in the above-described coated paper. In addition, no rib-shaped image deviation during printing of high-density images that adversely affects high image quality, image transmission unevenness with OHP, and blackening of the edge portion were not recognized, and there was no problem with minute gloss unevenness on the belt side image during double-sided printing. , High image quality. Further, even after the fixing test, abrasion by the peeling claw was not recognized on the pressure belt.
(Example 15-1)
As the heating roll 1, a base having a heat-resistant elastic layer 1 b (rubber hardness: 33 °) made of silicone rubber having high thermal conductivity formed on a hollow metal core 1 a made of metal having a diameter of 62 mm and having a thickness of 1.5 mm. A rubber in which 5 parts by mass of magnesium oxide (manufactured by Kyowa Chemical Industry Co., Ltd.) was compounded as a compounding material for rubber with respect to 95 parts by mass of a polyol-based vulcanization type fluororubber (manufactured by Daikin Industries, Ltd .: G-702) on a roll. The composition was coated to a thickness of 30 μm and baked at 230 ° C. for 3 hours to form a release layer 1c.

As the pressure belt 2, the fluororesin composition of Example 15 was coated on a thermosetting polyimide endless belt-like base substrate having a length of 340 mm and a circumference of 213.3 mm to a thickness of 30 μm. Exactly the same configuration except that baking was performed for 40 minutes, and then polishing with polishing paper (polishing machine: Super finisher manufactured by Matsuda Seiki, polishing paper: imperial wrapping film made of 3M, 30 mic silicon carbide abrasive grain type) was performed four times. A belt-type fixing device was manufactured.
Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 12-1, and the same evaluation was performed.

As a result, during the copy fixing test of 20,000 sheets, no trouble of paper peeling failure from the belt surface occurred at all. The paper elongation was 0.9 mm at maximum in the above-described coated paper. In addition, although slight gloss unevenness on the belt side during double-sided printing, which adversely affects high image quality, occurs slightly, it is within an allowable range. Regarding rib-shaped image deviation at high-density image printing and image edge blackening due to OHP. Was not generated, and although image transmission unevenness on OHP paper was slightly generated, it was at an allowable level and had high image quality aptitude. Even after the fixing test, no abrasion by the peeling claw was observed on the pressure belt.
(Example 16-1)
As the heating roll 1, a base roll in which a heat-resistant elastic layer 1b (rubber hardness 33 °) made of silicone rubber having high thermal conductivity is formed to a thickness of 1.5 mm on a hollow metal core 1a made of metal having a diameter of 62 mm. A rubber composition obtained by blending 5 parts by mass of magnesium oxide (manufactured by Kyowa Chemical Co., Ltd.) as a compounding material for rubber with 95 parts by mass of a polyol-based vulcanization type fluororubber (manufactured by Daikin Industries, Ltd .: G-702) The product was coated to a thickness of 30 μm and baked at 230 ° C. for 3 hours to form a release layer 1c.

As the pressure belt 2, a fluororesin composition of Example 16 was coated on a thermosetting polyimide endless belt-like base material having a length of 340 mm and a circumference of 213.3 mm to a thickness of 30 μm, and heated at 380 ° C. After baking for 40 minutes, polishing with a polishing paper (polishing machine: Super finisher manufactured by Matsuda Seiki, polishing paper: imperial wrapping film manufactured by 3M @ 30 mic silicon carbide abrasive grain type) was performed three times, and then again at 380 ° C. for 40 minutes. A belt-type fixing device having exactly the same configuration except that printing was performed was manufactured.

(4) Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 12-1, and the same evaluation was performed.

As a result, during the copy fixing test of 20,000 sheets, no trouble of paper peeling failure from the belt surface occurred at all. The paper elongation was 1.0 mm at maximum in the above-described coated paper. In addition, no rib-shaped image deviation during printing of high-density images that adversely affects high image quality, image transmission unevenness with OHP, and blackening of the edge portion were not recognized, and there was no problem with minute gloss unevenness on the belt side image during double-sided printing. , High image quality. Further, even after the fixing test, abrasion by the peeling claw was not recognized on the pressure belt.
(Comparative Example 5-1)
A belt having exactly the same configuration except that the surface layer 2c of the pressure belt 2 in Example 12-1 was coated with the fluororesin composition of Comparative Example 5 to a thickness of 30 μm and baked at 380 ° C. for 40 minutes. A mold fixing device was manufactured. Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 12-1, and the same evaluation was performed.

As a result, the paper elongation with respect to the above-mentioned coated paper was 1.0 mm, but the minute gloss unevenness on the belt side image at the time of double-sided printing, which adversely affects high image quality, occurred at an unacceptable level. After the fixing test, wear marks were formed on the pressure belt due to the peeling nails, and wear marks were formed on the belt side image during double-sided printing.
(Comparative Example 6-1)
The surface layer 2c of the pressure belt 2 in Example 12-1 was coated with the rubber composition of Comparative Example 6 to a thickness of 180 μm, baked at 230 ° C. for 3 hours, and then polished with polishing paper (polishing machine: A belt-type fixing device having exactly the same configuration was produced except that a super finisher manufactured by Matsuda Seiki and abrasive paper: an imperial wrapping film made of 3M, 9 mic silicon carbide abrasive grains type) were performed twice. Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 12-1, and the same evaluation was performed.

As a result, during the 20,000-sheet copy fixing test, the paper peeling defect trouble from the belt surface did not occur at all, but the paper elongation with respect to the above-described coated paper was 3.0 mm, which was a size that would be a problem in practical use. there were. Also, fine gloss unevenness did not occur in the belt-side image during double-sided printing, but rose-shaped image shift occurred during high-density image printing.
[Reference: Example 6-2]
A belt having exactly the same configuration as that of Example 12-1, except that the surface layer 2c of the pressure belt 2 was coated with the fluororesin composition of Example 6 to a thickness of 30 μm and baked at 380 ° C. for 40 minutes. A mold fixing device was manufactured. Using this apparatus, a fixing test of an unfixed image was performed under the same conditions as in Example 12-1, and the same evaluation was performed.

As a result, during the copy fixing test of 20,000 sheets, no trouble of paper peeling failure from the belt surface occurred at all. The paper elongation with respect to the coated paper was 1.0 mm, and some image flaws occurred during printing of a double-sided image due to minute projections on the belt surface, but were within an allowable range. Further, the minute gloss unevenness of the belt side image at the time of double-sided printing, which adversely affects the high image quality, is an allowable level at the initial stage, and the level slightly decreases after 20,000 sheets. No darkening of the image edge portion occurred in the above. Although image transmission unevenness on OHP paper slightly occurred, it was within an allowable range, and had normal image quality aptitude. Even after the fixing test, no abrasion by the peeling claw was observed on the pressure belt.

From these Examples and Comparative Examples, it can be seen that an endless belt having a surface layer composed of PFA containing specific filler particles has a high release property and durability to toner, low adhesiveness to paper, and low oiliness to oil. Of the printed matter, elongation of the recording paper, and rose-shaped image while improving the affinity and surface shape (surface shape without undulations, sharp projections, and micro-concave surface) of the toner while having high release properties and durability to toner. It can be seen that all of the suppression of the displacement and the high-quality image quality (improvement of fine satin-like gloss unevenness at the time of double-sided printing, unevenness of image transmission on OHP paper, white spots on the image, and traces of peeling nail wear) can be satisfied. Also, by appropriately selecting each material and performing post-processing such as surface roughening, the surface characteristics of the endless belt become more optimal, and the paper elongation, the rib-shaped image quality deviation and the satin-like minute gloss unevenness are improved. It can also be understood that it is possible to simultaneously suppress uneven transmission of OHP, white spots on an image, and traces of abrasion of a peeling nail.

FIG. 1 is a schematic configuration diagram illustrating an embodiment of a heating roll / belt type fixing device of the present invention. FIG. 4 is a schematic configuration diagram showing another embodiment of the heating roll / belt type fixing device of the present invention.

Explanation of reference numerals

Reference Signs List 1 fixing roll 1a hollow roll 1b elastic layer 1c release layer 1d heater lamp (heating source)
2 Pressure belt (endless belt)
2d heater lamp (heating source)
3 Recording material (recording sheet)
4 Unfixed toner 5 Oil supply device 6 Cleaning device 7 External heating device 8 Peeling claw 9 Temperature sensor 10 Support roll 11 Press roll 12 Press pad

Claims (20)

At least a surface layer provided on the outer peripheral surface is a mixture of at least one inorganic filler particle selected from the group consisting of a metal oxide, a silicate mineral, carbon black, a nitrogen compound, and mica. A fixing part for electrophotography, comprising a fluororesin made of a copolymer with alkyl vinyl ether (PFA). The inorganic filler particles are selected from the group consisting of BaSO ₄ , zeolite, silicon oxide, tin oxide, copper oxide, iron oxide, zirconium oxide, ITO (tin-doped indium oxide), silicon nitride, boron nitride, titanium nitride, and mica. 2. The electrophotographic fixing component according to claim 1, wherein the fixing component is at least one selected from the group consisting of: 2. The electrophotographic fixing component according to claim 1, wherein the inorganic filler particles are at least one selected from the group consisting of BaSO ₄ , zeolite, and mica. 3. 4. The surface layer according to claim 1, wherein the inorganic filler particles are blended in an amount of 1 part by mass to 30 parts by mass with respect to 100 parts by mass of the copolymer (PFA). An electrophotographic fixing part according to any of the claims. 5. The electrophotographic fixing component according to claim 1, wherein the inorganic filler particles have an average particle size of 0.1 μm or more and 15 μm or less. 6. The average particle diameter of the inorganic filler particles is 0.1 μm or more and 10 μm or less,
5. The electrophotographic fixing component according to claim 1, wherein the inorganic filler particles having a particle size of 15 μm or more account for 25% by mass or less of the inorganic filler particles. 6. The average particle diameter of the inorganic filler particles is 0.1 μm or more and 10 μm or less,
5. The electrophotographic fixing component according to claim 1, wherein the inorganic filler particles having a particle size of 15 μm or more account for 5% by mass or less of the inorganic filler particles. 6. The surface layer is prepared by blending 1 to 10 parts by mass of conductive fine particles with respect to 100 parts by mass of the copolymer (PFA). An electrophotographic fixing part according to any of the claims. The surface layer is formed from two or more kinds of the copolymer (PFA) particles having different particle diameters,
The copolymer (PFA) particles having an average particle size of 3 μm or more and 30 μm or less are blended in an amount of 5 parts by mass or more and 70 parts by mass or less with respect to 100 parts by mass of the copolymer (PFA) particles having an average particle size of 1 μm or less. The electrophotographic fixing component according to any one of claims 1 to 8, wherein the fixing component comprises: The surface layer is formed from two or more kinds of the copolymer (PFA) particles having different particle diameters,
In addition, the copolymer (PFA) particles having an average particle diameter of 3 μm to 15 μm are blended in an amount of 5 parts to 30 parts by mass with respect to 100 parts by mass of the copolymer (PFA) particles having an average particle diameter of 1 μm or less. The electrophotographic fixing component according to any one of claims 1 to 8, wherein the fixing component is formed. The surface layer is formed of two or more kinds of the copolymer (PFA) particles having different particle diameters,
The melt viscosity at 380 ° C. of the copolymer (PFA) particles having an average particle size of 1 μm or less is in a range of 3.5 × 10 ⁴ Pa · s or less,
The copolymer (PFA) having an average particle diameter of 3 μm or more and 30 μm or less has a melt viscosity at 380 ° C. of 1.5 × 10 ⁴ Pa · s or less. 11. The fixing part for electrophotography according to any one of 10. The surface layer is formed of two or more kinds of the copolymer (PFA) particles having different particle diameters,
The melt viscosity at 380 ° C. of any of the copolymer (PFA) particles is in a range of 1.5 × 10 ⁴ Pa · s or less. The fixing part for electrophotography according to the above. The fixing part for electrophotography according to claim 1, wherein the surface layer is subjected to post-processing. The said surface layer is heat-processed at the temperature which the said copolymer (PFA) particle melt | dissolves, after performing a post-processing process, The Claim 1 characterized by the above-mentioned. Fixing parts for electrophotography. The electrophotographic fixing component according to claim 1, wherein a surface gloss of the surface layer is in a range of 15 or more and 60 or less. The fixing part for electrophotography according to claim 1, wherein a contact angle of the surface layer with the amine-modified silicone oil is 37 ° or less at 170 ° C. 17. The surface layer has a filter centerline waviness of 0.9 μm or less under a condition of a cutoff of 0.25 mm, a ten-point average surface roughness (Rz) in a range of 0.5 μm or more and 15 μm or less, and 17. The fixing part for electrophotography according to claim 1, wherein a surface friction coefficient is 0.45 or less. A fixing endless belt for electrophotography, comprising a heat-resistant layer formed using at least one composite material selected from the group consisting of a polymer resin, a metal, a ceramic, and a glass fiber. 18. A fixing endless belt for electrophotography, wherein the fixing endless belt for photography is the fixing component for electrophotography according to any one of claims 1 to 17. A recording material having a pair of fixing units including a heating roll and a pressure belt pressed against the heating roll, and holding an unfixed toner image in a nip region formed by the heating roll and the pressure belt In a heated roll-belt type fixing device that performs fixing by heat and pressure,
A heating roll / belt type fixing device, wherein the pressure belt is the fixing part for electrophotography according to any one of claims 1 to 17. 20. The recording medium according to claim 19, wherein a time period in which the recording material holding the unfixed toner image passes in a nip region formed by the heating roll and the pressure belt is 0.030 seconds or more. Roller belt type fixing device.

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