JP2009108134A - Resin composition, resin molded article, endless belt, tensely belt-spun device, roll member, process cartridge and image-forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin composition that can give resin molded articles excellent in flexibility, to provide an endless belt and a roll member each having excellent flexibility and used for an image-forming device, and to provide an image-forming device which can form images excellent in image qualities. <P>SOLUTION: The resin composition comprises a polyamideimide precursor and a polyamide elastomer. The endless belt and the roll member for an image-forming device each comprise a polyamideimide precursor and a polyamide elastomer. The image-forming device has the endless belt and/or the roll member. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a resin composition, a resin molded product, an endless belt, a belt stretching device, a roll member, a process cartridge, and an image forming apparatus.

  In an image forming apparatus using an electrophotographic method such as a printer, a copying machine, or a facsimile, an electrostatic latent image is formed on a precharged image carrier by a laser that modulates an image signal, and then charged toner Thus, the electrostatic latent image is developed to form a toner image. Then, this toner image is electrostatically transferred to a recording medium via an intermediate transfer member or directly, and fixed on the recording medium to form an image.

  In this image forming apparatus, a flexible endless belt, a roll member, or the like is used for various members such as the intermediate transfer member, a conveying device that conveys the recording medium, and a fixing device. As materials for the endless belt and the roll member, those using a heat resistant resin such as polyimide resin, polyamideimide resin, and polycarbonate are known.

In particular, as an example using the above-mentioned polyamideimide resin, at least one compound selected from the group consisting of silicone, silicone-modified compounds, fluorine compounds and fluorine-modified compounds, polyethersulfone resins, polyamideimide resins, conductive materials An endless belt composed of a filler is provided (for example, see Patent Document 1).
In addition, a semiconductive polyamideimide composition (for example, see Patent Document 2) composed of a polyamideimide resin having a number average molecular weight of 13,000 or more and conductive carbon black, for 100 parts by mass of the polyamideimide resin, An endless belt in which a solvent in a range of 0.5 parts by mass or more and 6.0 parts by mass or less is left is known (for example, see Patent Document 3).
Furthermore, an endless cylindrical semiconductive polyamideimide film (endless belt) in which the electrical resistance value of the back surface portion is smaller than that of the front surface portion in the single layer is used (see, for example, Patent Document 4).

Further, a belt (endless belt) using a polyimide resin and a polyamide-imide resin and a fluororesin, which are different in frictional chargeability from the polyimide resin as a frictional charge adjusting agent, is known (for example, see Patent Document 5).
Further, the charging roll has a surface resistance value of 10 ⁶ Ω / □ or more and 10 ⁹ Ω / □ or less, a nylon 12 segment having a Shore A hardness of 45 or more and a Shore D hardness of 60 or less, a segment made of polyalkylene glycol, There has been provided a charging roll (roll member) in which an endless tubular film of a polyether block amide elastomer, which is composed mainly of a resin, is suspended (see, for example, Patent Document 6).

However, endless belts and roll members using these polyamideimide resins are required to be more flexible and further improvements in flexibility have been desired.
JP 2006-058661 A JP 2001-354854 A JP 2000-313071 A Japanese Patent Laid-Open No. 10-226028 JP-A-10-282808 Japanese Patent No. 3527910

The objective of this invention is providing the resin composition which can obtain the resin molding excellent in the softness | flexibility, and the resin molding which has the outstanding softness | flexibility.
In addition, an endless belt having excellent flexibility, a belt stretching device capable of obtaining excellent flexibility with respect to circular driving, a roll member having excellent flexibility, and excellent handleability of the roll member Another object of the present invention is to provide a process cartridge and an image forming apparatus capable of forming an image having excellent image quality.

The above problem is solved by the following means.
That is, the invention according to claim 1 is a resin composition containing a polyamideimide resin precursor and a polyamide elastomer.

  In the invention according to claim 2, the content of the polyamide elastomer according to claim 1 is in the range of 10 parts by mass or more and 50 parts by mass or less in solid content with respect to 100 parts by mass of the precursor of the polyamideimide resin. It is a resin composition.

  The invention according to claim 3 is a resin composition in which the polyamide elastomer according to claim 1 or 2 is a polymerized fatty acid-based polyamide elastomer obtained by block copolymerization of polyamide, polyether ester, and polyester. .

  The invention according to claim 4 is a resin molded product containing a polyamideimide resin and a polyamide elastomer.

  The invention according to claim 5 is an endless belt for an image forming apparatus containing a polyamideimide resin and a polyamide elastomer.

  According to a sixth aspect of the present invention, there is provided a belt stretcher for an image forming apparatus, comprising: the endless belt according to the fifth aspect; and a plurality of stretching members that rotatably stretch the endless belt from the inner surface side. Device.

  The invention according to claim 7 is an image forming apparatus comprising the endless belt according to claim 5.

  The invention according to claim 8 is a roll member for an image forming apparatus containing a polyamideimide resin and a polyamide elastomer.

  The invention according to claim 9 is a process cartridge formed to be detachable from the image forming apparatus and having the roll member according to claim 8.

  A tenth aspect of the present invention is an image forming apparatus including the roll member according to the eighth aspect.

  According to the invention which concerns on Claim 1, compared with the case where it does not have the structure containing the precursor of polyamideimide resin, and a polyamide elastomer, the resin molding excellent in the softness | flexibility can be obtained.

  According to the invention which concerns on Claim 2, compared with the case where content is not considered, the resin molding excellent in the softness | flexibility can be obtained.

  According to the invention which concerns on Claim 3, compared with the case where it does not have this structure, the resin molding excellent in the softness | flexibility can be obtained.

  According to the invention which concerns on Claim 4, the outstanding softness | flexibility can be obtained compared with the case where it does not have the structure containing a polyamideimide resin and a polyamide elastomer.

  According to the invention which concerns on Claim 5, the outstanding softness | flexibility can be obtained compared with the case where it does not have the structure containing a polyamideimide resin and a polyamide elastomer.

  According to the invention which concerns on Claim 6, compared with the case where it does not have this structure, the softness | flexibility excellent also with respect to the circumference drive etc. can be obtained.

  According to the seventh aspect of the present invention, it is possible to form an image with excellent image quality as compared with the case where the present configuration is not provided.

  According to the invention which concerns on Claim 8, the outstanding softness | flexibility can be acquired compared with the case where it does not have the structure containing a polyamideimide resin and a polyamide elastomer.

  According to the invention which concerns on Claim 9, the handleability of the roll member which has the outstanding softness | flexibility can be improved compared with the case where it does not have this structure.

  According to the tenth aspect of the present invention, an image having excellent image quality can be formed as compared with the case where the present configuration is not provided.

<Resin composition>
First, the resin composition which concerns on 1st Embodiment which is a preferable aspect is demonstrated.
The resin composition according to the first embodiment contains a polyamideimide resin precursor (hereinafter sometimes simply referred to as “polyamideimide precursor”) and a polyamide elastomer, and other additives. Can be added.

When the resin composition is formed into a resin molded product by mixing a polyamide imide precursor that forms a polyamide imide resin by heating with a polyamide elastomer having an amide group common to the polyamide imide resin, The affinity between the interfaces can be ensured, and excellent flexibility can be obtained while having high strength.
In addition, this resin composition can be used for manufacture of the resin molding mentioned later.

(Polyamide-imide resin precursor)
The resin composition according to the first embodiment contains a polyamideimide precursor that forms a polyamideimide resin.
As the polyamideimide precursor, a trivalent carboxylic acid component generally having an acid anhydride group and an isocyanate or diamine can be used. As the trivalent carboxylic acid component, trimellitic anhydride is preferable. Further, the trimellitic anhydride and a derivative of a trivalent carboxylic acid having an acid anhydride group that reacts with another isocyanate group or amino group can be used in combination. Preferred structures include the following.

Here, R represents hydrogen, an alkyl group having 1 to 10 carbon atoms, or a phenyl group, and X represents —CH ₂ —, —CO—, —SO ₂ —, or —O—.

The mixing ratio of the isocyanate or diamine and the trivalent carboxylic acid component is such that the total ratio of isocyanate groups or amino groups to the total number of carboxyl groups and acid anhydride groups of the acid component is 0.6 or more and 1.4 or less. It is preferable to be, more preferably 0.7 to 1.3, and particularly preferably 0.8 to 1.2.
The polyamideimide resin can be obtained, for example, by the following production method when isocyanate is used.

(1) A method in which an isocyanate component and a tricarboxylic acid component are used at a time and reacted to obtain a polyamideimide resin.
(2) A method in which an excess amount of an isocyanate component and an acid component are reacted to synthesize an amideimide oligomer having an isocyanate group at a terminal, and then a tricarboxylic acid component is added and reacted to obtain a polyamideimide resin.
(3) After reacting an excess amount of a tricarboxylic acid component with an isocyanate component to synthesize an amideimide oligomer having a carboxylic acid or acid anhydride group at the terminal, the acid component and the isocyanate component are added and reacted to form a polyamideimide. A method of obtaining a resin.

  In the case of using an amine, it can be obtained by applying the above-described production method using an isocyanate, but it can also be obtained by reacting an amine with tribasic acid anhydride monochloride as an acid component. it can.

  About the solvent to be used, a polar solvent is mentioned suitably from points, such as solubility. As the polar solvent, N, N-dialkylamides are preferable. Specifically, N, N-dimethylformamide, N, N-dimethylacetamide, N, N-diethylformamide, N , N-diethylacetamide, N, N-dimethylmethoxyacetamide, dimethylsulfoxide, hexamethylphosphortriamide, N-methyl-2-pyrrolidone, pyridine, tetramethylenesulfone, dimethyltetramethylenesulfone and the like. These can be used singly or in combination.

The number average molecular weight of the polyamideimide resin thus obtained is measured by gel permeation chromatography (GPC), and is a value converted from a standard polyethylene glycol (PEG) calibration curve of 10,000 to 50,000. The following is preferable.
Here, the method for measuring the number average molecular weight by GPC will be specifically described. An HLC-8120GPC manufactured by Tosoh Corporation is used as the GPC main body, the column temperature is 40 ° C., the pump flow rate is 0.4 mL / min, and RI (built in the GPC main body) is used as the detector. In the data processing, the molecular weight is obtained from the PEG-converted molecular weight using a standard PEG calibration curve with a known molecular weight (calibration at a molecular weight of 1000 or more).
Column used: SuperAWM-H + SuperAWM-H + SuperAW3000
Mobile phase: 10 mM LiBr + N-methylpyrrolidone Injection volume: 20 μl
Sample concentration: 0.1% (w / w)

(Polyamide elastomer)
A polyamide elastomer is added to the resin composition according to the first embodiment.
The polyamide elastomer is not particularly limited, but a polymerized fatty acid polyamide elastomer is preferably used. Furthermore, a polymerized fatty acid-based polyamide elastomer obtained by block copolymerization of polyamide, polyether ester, and polyester is more preferably used, and more specifically, a polyamide elastomer represented by the following structural formula is used.
Basic structural formula: HO — [— (CO—PA—NH) _a — (CO—PE—O) _b —] _n —H
(In the above basic structural formula, PA represents a polymerized fatty acid copolymer polyamide skeleton (hard segment), PE represents a polyether ester skeleton (soft segment), and a, b and n are each independently an integer of 1 or more. Represents.)

  As the monomer constituting the polymerized fatty acid polyamide, for example, short chain dibasic acid and dimer acid are most preferable.

  The polyamide elastomer preferably has a durometer (Shore) D hardness of 20 to 50. The durometer (Shore) D hardness can be measured according to ISO-868, and the values described in this specification are values measured by this method.

  The content of the polyamide elastomer is preferably 10 parts by mass or more and 50 parts by mass or less, preferably 10 parts by mass or more and 40 parts by mass or less with respect to 100 parts by mass of the polyamideimide resin (solid content of the polyamideimide precursor). More preferably, it is 10 parts by mass or more and 30 parts by mass or less.

(Other additives)
Various additives can be added to the resin composition according to the first embodiment, and for example, a conductive agent can be contained.
The content of the conductive agent is preferably in the range of 1.0 to 50 parts by mass with respect to 100 parts by mass of the polyamideimide resin (solid content of the polyamideimide precursor), and 1.0 parts by mass. It is more preferably in the range of 40 parts by mass or less, and particularly preferably in the range of 1.0 to 35 parts by mass.

The conductive agent is used for the resin composition to exhibit suitable conductivity. The “conductive” means that the volume resistivity is less than 10 ⁷ Ω · cm.
Examples of the conductive agent include carbon materials such as carbon black, carbon nanotubes, graphite, and carbon fibers; metal powders such as aluminum and magnesium; metal materials such as metal fibers; and surface-treated metals. Oxide powder; and the like. Examples of the ion conductive conductive agent include alkali metal peroxides such as lithium peroxide; perchlorates such as lithium perchlorate; quaternary ammonium salts such as tetrabutylammonium salts; phosphate ester salts; be able to. However, the conductive agent is not limited to the above.

  In the case of using the ion conductive conductive agent, the blending amount thereof is in the range of 0.1 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the polyamideimide resin (solid content of the polyamideimide precursor). It is preferable to mix.

  In addition to the above-described constituent components, the resin composition has other additives such as a release agent, an antistatic agent, a light stabilizer, an antioxidant, a reinforcing agent, as long as the characteristics are not impaired. Softening agents, foaming agents, dyes and pigments, inorganic fillers and the like can be added.

(Production method of resin composition)
The resin composition which concerns on 1st Embodiment can be manufactured by mixing each said component with mixers, such as a tumbler, a V-type blender, a Nauta mixer, a Banbury mixer, a kneading roll, an extruder. In the production of the resin composition, the mixing method of each component and the order of mixing are not particularly limited. As a general method, all the constituent components are mixed in advance with a tumbler, V blender, etc., and the mixture is melt-mixed by an extruder. Depending on the shape of the constituent components, two types of the constituent components may be used. It is also possible to use a method in which the remaining components are melted and mixed with the above molten mixture.

<Resin molding>
By resin-molding the resin composition according to the first embodiment obtained as described above, a resin molded product containing a polyamideimide resin and a polyamide elastomer can be produced. Examples of the resin molding include endless belts used in image forming apparatuses, roll members, sliding members used in fixing devices, and the like. Applications other than the image forming apparatus include shock absorbers for gears in industrial products, impact absorbers (sneakers, tennis guts) in sports equipment, and shock absorbers such as automobile bumpers.
In addition, the said resin molding can set a material, a shape, a magnitude | size, etc. according to a use, a function, etc.

<A> Endless Belt for Image Forming Apparatus Next, an endless belt for an image forming apparatus according to the second embodiment, which is a preferable mode, will be described. The endless belt can be widely used as an endless belt for use in transfer members (intermediate transfer members, paper transport members, etc.), charging members, developing members, fixing members, etc. in image forming apparatuses.

(Method for producing endless belt)
For example, the endless belt according to the second embodiment is manufactured on the surface of a cylindrical core body (hereinafter referred to as a cylindrical core body) that has been blasted and previously applied with a release agent. A coating film forming step of forming a coating film by applying a coating solution comprising the resin composition according to the embodiment; a tubular body forming step of forming a tubular body by heating and drying and heating reaction of the coating film; And a peeling step of peeling the tubular body from the cylindrical core. Moreover, you may have another process as needed.

Hereinafter, the manufacturing method of the endless belt according to the second embodiment will be described separately for each process.
(1) Coating film forming step In the coating film forming step, the surface of the cylindrical core to which the coating solution is applied is arithmetic average roughness Ra by using a roughening method such as blasting, cutting, sandpaper peeling, etc. The surface is preferably roughened in the range of 0.2 μm to 2 μm.

  Moreover, it is preferable that the release property is provided to the surface of the cylindrical core. In order to impart releasability, a method of coating the cylindrical core with a fluorine resin or silicone resin, a method of applying a release agent to the surface of the cylindrical core, or the like can be used.

As a method of applying the coating solution to the cylindrical core, a dip coating method in which the cylindrical core is dipped in the coating solution and raised (pulled up), an annular coating method in which the film thickness is controlled by the annular body, and cylinder Known methods such as a flow coating method in which a coating solution is discharged onto the surface while rotating the core, and a blade coating method in which the coating is metalized with a blade can be employed. In addition, said "applying on the surface of a cylindrical core body" means apply | coating to the surface of the layer, when it has a layer on the surface of a cylindrical core body. Further, “rising the cylindrical core body” is a relative relationship with the liquid level at the time of application, and includes the case of “stopping the cylindrical core body and lowering the coating liquid level”.
Among the coating methods, a flow coating method and a blade coating method are more preferable.

(2) Tubular body forming step In this step, the coating film is heated and dried and heated to form a tubular body on the surface of the cylindrical core. In addition, this tubular body means the film | membrane which removed the solvent from the coating film, and was made to heat-react.

First, in the tubular body forming step, for the purpose of removing the solvent present in the coating film, heat drying is performed to such an extent that the coating film is not deformed even if left standing. The heating condition is preferably 10 minutes or more and 60 minutes or less in a temperature range of 100 ° C. or more and 200 ° C. or less.
Within the above temperature range, the heating time may be shorter as the temperature is higher. In addition to heating, it is also effective to apply wind. For heating, the temperature may be increased stepwise or at a constant rate.

  In addition, it is preferable that the said heat drying leaves 20 mass% or more and 50 mass% or less of solvent in a coating film.

The process from heating and drying the coating to the heating reaction may be carried out continuously, but the temperature may be temporarily lowered during the course. Here, “reducing the temperature” refers to cooling the coating film heated by heat drying together with the cylindrical core body to lower the temperature. Lowering the temperature is effective when the heating and drying apparatus for removing the solvent is different from the heating reaction apparatus for heating and reacting the coating film.
When the heating and drying apparatus and the heating reaction apparatus are integrated, it is not necessary to lower the temperature once.

  In the tubular body forming step, after the above-mentioned heat drying, the coating film is heated (reacted) for 60 minutes to 180 minutes, preferably in a temperature range of 150 ° C. or higher and 300 ° C. or lower (but higher temperature than heat drying). Thus, a tubular body can be formed. In the heating reaction, it is preferable to remove residual solvent as much as possible before reaching the final temperature of heating. Specifically, before heating, the temperature is in the range of 120 ° C. to 180 ° C. for 30 minutes to 60 minutes. Subsequently, it is preferable to remove the residual solvent by heating and drying, and then to heat by gradually increasing the temperature stepwise or at a constant rate to form a tubular body.

(3) Peeling Step After the heating reaction (firing), the cylindrical core body is cooled, and through this step of peeling the formed tubular body, the endless belt according to the second embodiment can be obtained. .
Since the release agent is applied to the cylindrical core body in advance, the inner peripheral surface of the tubular body and the outer peripheral surface of the cylindrical core body do not directly contact each other, and the tubular body can be easily removed from the cylindrical core body. By peeling, an endless belt for an image forming apparatus can be obtained.

  It should be noted that the extracted endless belt can be provided with a step of cutting unnecessary portions at both ends thereof, and further, a step of drilling (punching) processing, rib attaching processing, and the like.

(Surface resistivity)
When the endless belt for an image forming apparatus according to the second embodiment is used as a transfer member (intermediate transfer member, paper conveying member, etc.), a charging member, a developing member, etc., it is required to have conductivity. Specifically, the surface resistivity of the endless belt is preferably 1.0 × 10 ⁸ Ω / □ or more and 1.0 × 10 ¹⁵ Ω / □ or less, and 1.0 × 10 ⁹ Ω / □ or more and 1 More preferably, it is 0.0 × 10 ¹⁵ Ω / □ or less.
The surface resistivity can be controlled by adding a conductive agent to the resin composition according to the first embodiment as described above.

Moreover, the measurement of the said surface resistivity can be measured using the circular electrode shown in FIG. 1, and the value as described in this specification is measured by the following method.
FIG. 1 is a schematic plan view (a) and a schematic cross-sectional view (b) showing an example of a circular electrode for measuring surface resistance. The circular electrode shown in FIG. 1 includes a first voltage application electrode A and a plate-like insulator B. The first voltage application electrode A has a cylindrical electrode portion C and a ring electrode portion D on a cylinder having an inner diameter larger than the outer diameter of the cylindrical electrode portion C and surrounding the cylindrical electrode portion C at a constant interval. With. An endless belt T to be measured is sandwiched between the cylindrical electrode part C and ring electrode part D in the first voltage application electrode A and the plate insulator B, and the cylindrical electrode in the first voltage application electrode A The current I (A) that flows when the voltage V (V) is applied between the part C and the ring-shaped electrode part D is measured, and the surface resistivity ρs (Ω) of the endless belt T is calculated by the following equation (1). / □) can be calculated.
Formula (1) ρs = π × (D + d) / (D−d) × (100 (V) / I)
Here, in the above formula (1), d (mm) indicates the outer diameter of the cylindrical electrode portion C, and D (mm) indicates the inner diameter of the ring-shaped electrode portion D. The surface resistivity was measured in an environment of 22 ° C. and 55% RH.

<B> Roll Member for Image Forming Apparatus Next, a roll member for the image forming apparatus according to the third embodiment which is a preferable aspect will be described. The roll member has a resin layer formed on the core material by at least the resin composition according to the first embodiment. In addition, you may have layers other than the above, for example, the said resin layer may be formed on the core material through the intermediate | middle layer, and has surface layers, such as a protective layer, on the said resin layer surface It may be.

  The roll member according to the third embodiment can be widely used as a roll member used for a transfer member (intermediate transfer member, paper transport member, etc.), a charging member, a developing member, a fixing member, etc. in an image forming apparatus.

(Method for manufacturing roll member)
The core material in the roll member is not particularly limited, and a known material can be used. For example, metals such as aluminum and stainless steel, and high-hardness resins such as ABS are preferably used. The core material is preferably a cylindrical shape. Further, the core material may have a stepped shape with a thin support portion.
An elastically deformable layer made of sponge or solid rubber may be provided on the core material.

Any method can be used for bonding the core material or the elastically deformable layer and the resin layer. For example, for the core material, (a) the core material is previously installed in a cylindrical mold, the resin composition according to the first embodiment, which is a resin layer material, is injected, and a heating reaction ( (B) and (b) a method in which a core material is inserted into and bonded to a resin layer formed in a cylindrical shape in advance. When the elastic deformation layer is present, for example, a method in which a resin layer previously formed in a tube shape is inserted and coated on a core material on which the elastic deformation layer is formed is preferably used.
In any of the above-described methods, the resin layer can be provided on the core material or the elastic deformation layer through an adhesive layer or the like as necessary. Any material can be used as the material constituting the adhesive layer, and a conductive adhesive, a hot melt adhesive, or the like is preferably used.

(Surface resistivity)
When the roll member for an image forming apparatus according to the third embodiment is used as a transfer member (intermediate transfer member, paper transport member, etc.), a charging member, a developing member, etc., it is required to have conductivity. Specifically, the surface resistivity of the roll member is preferably 1.0 × 10 ⁶ Ω / □ or more and 1.0 × 10 ¹³ Ω / □ or less, and 1.0 × 10 ⁶ Ω / □ or more. More preferably, it is 0 × 10 ¹¹ Ω / □ or less.
The surface resistivity can be controlled by adding a conductive agent to the resin composition according to the first embodiment as described above.

  The surface resistivity can be measured by a measurement method using the endless belt, using a resin layer in the roll member (or a surface layer and a resin layer in the case where a surface layer is further provided).

<Image forming apparatus>
Next, an image forming apparatus according to the fourth embodiment which is a preferable aspect will be described in detail with reference to the drawings.
An image forming apparatus 80 shown in FIG. 2 has a developing device 44 for developing with BK (black) toner, a developing device 38 for developing with Y (yellow) toner, M ( A developing device 40 for developing with magenta toner, and a developing device 42 for developing with C (cyan) toner, and the downstream side of these developing devices (the driving direction of the image carrier 30 (arrow F) The intermediate transfer member 10 is in contact with the surface of the image carrier 30 on the downstream side of FIG. The intermediate transfer body 10 is stretched by a support roll 48, a support roll 50, a backup roller 56, and a support roll 54 provided on the inner surface side in the following order in the counterclockwise direction, and is a belt stretch for an image forming apparatus. A device 90 is formed.
In addition, a conductive roller 52 is provided at a position facing the image carrier 30 with the intermediate transfer body 10 interposed therebetween to form a primary transfer portion (the “conductive” is a volume resistivity of 10 ⁷ Ω). Means less than cm). The backup roller 56 is provided with an electrode roller 58 that rotates in pressure contact, and a bias roller 34 that is a transfer electrode is provided at a position facing the backup roller 56 with the intermediate transfer member 10 interposed therebetween. The next transfer portion is formed. A cleaning blade 70 is disposed in contact with the bias roller 34. A recording medium 68 supplied to the secondary transfer unit is stored in the recording medium storage unit 36, and a pickup for picking up the recording medium 68 stored in the recording medium storage unit 36 and guiding it to the installation position of the feed roller 64. A roller 66 is provided. Further, on the surface of the intermediate transfer body 10 downstream of the bias roller 34 (on the downstream side of the driving direction of the intermediate transfer body 10 (arrow G)), a peeling claw 62 for peeling the recording medium 68 and further downstream is residual toner. Each of the belt cleaners 46 is disposed so as to be able to contact and separate.
In the image forming apparatus 80 shown in FIG. 2, the endless belt according to the second embodiment described above is used as the intermediate transfer member 10. Further, as the conductive roller 52, the roll member according to the third embodiment described above is used. The conductive roller 52 may form a process cartridge that can be attached to and detached from the image forming apparatus 80 together with the intermediate transfer member 10, the support roll 48, the support roll 50, the backup roller 56, the support roll 54, and the like.

Next, the operation of the image forming apparatus 80 will be described.
In the image forming apparatus 80, the image carrier 30 is rotated in the direction of arrow F, and the surface thereof is charged by a charging device (not shown). The charged image carrier 30 is scanned and exposed by an image writing device such as a laser writing device (not shown), and an electrostatic latent image of the first color (for example, BK) is formed on the image carrier 30. The electrostatic latent image is developed by the developing device 44 and visualized, and a toner image T is formed on the image carrier 30. When the toner image T reaches the primary transfer portion where the conductive roller 52 is disposed by the rotation of the image carrier 30, an electric field having a reverse polarity is applied to the toner image T by the conductive roller 52, and the toner image T is statically moved. Primary transfer is performed by rotation of the intermediate transfer member 10 in the direction of arrow G while being electrically attracted to the intermediate transfer member 10.

  Thereafter, after the second color toner image, the third color toner image, and the fourth color toner image are sequentially formed on the image holding member 30 by the above-described operation, they are superimposed on the intermediate transfer member 10. Thus, a multicolor toner image is formed. The toner used at this time may be either a one-component toner or a two-component toner.

  The multicolor toner image transferred to the intermediate transfer member 10 reaches the secondary transfer portion where the bias roller 34 is installed by the rotation of the intermediate transfer member 10.

  The recording medium 68 is taken out from the recording medium storage unit 36 one by one by the pickup roller 66 and is fed to the secondary transfer unit sandwiched between the intermediate transfer member 10 and the bias roller 34 by the feed roller 64 at a predetermined timing. The The multi-color toner image held on the intermediate transfer member 10 is transferred to the fed recording medium 68 by the pressure contact conveyance by the bias roller 34 and the backup roller 56 and the rotation of the intermediate transfer member 10.

  For the transfer of the multicolor toner image, a transfer voltage having the same polarity as that of the multicolor toner image is applied to the electrode roller 58 that is in pressure contact with the backup roller 56 disposed oppositely via the bias roller 34 and the intermediate transfer body 10. As a result, the multicolor toner image is transferred to the recording medium 68 by electrostatic repulsion. As described above, an image can be formed on the recording medium 68.

  The recording medium 68 to which the multicolor toner image has been transferred is peeled off from the intermediate transfer body 10 by the peeling claw 62, conveyed to a fixing device (not shown), and fixed to a permanent image by pressing / heating treatment. Is done. Note that the residual toner is removed by the belt cleaner 46 from the intermediate transfer body 10 after the transfer of the multicolor toner image to the recording medium 68 is completed. The bias roller 34 is provided so that a cleaning blade 70 made of polyurethane is in contact therewith, and foreign matters such as toner particles and paper dust adhered by transfer are removed.

  In the case of transfer of a single color image, the toner image T that has been primarily transferred is subjected to secondary transfer as it is and conveyed to the fixing device. The rotation of the intermediate transfer member 10 and the rotation of the image carrier 30 are controlled so that the rotation of the intermediate transfer member 10 and the image carrier 30 is synchronized so that the toner images of the respective colors do not shift.

  Here, the color image forming apparatus 80 that repeats the temporary transfer has been described. However, the endless belt according to the second embodiment described above or the roll member according to the third embodiment is included in the image forming apparatus of this other aspect. Can also be used. For example, a normal monocolor image forming apparatus in which a single color toner is accommodated in a developing device, a tandem color image forming apparatus in which a plurality of image holding bodies each having a developing device for each color are arranged in series on an intermediate transfer member, etc. Is mentioned.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail using an Example, this invention is not limited by the following Example. In the following, “part” represents “part by mass”.

[Example of endless belt]
<Example 1>
-Production of endless belt 1-
First, polyamide elastomer (manufactured by Fuji Kasei Kogyo Co., Ltd .: TPAE12, polymerized fatty acid-based polyamide elastomer obtained by block copolymerization of polyamide, polyether ester and polyester, hardness (Shore D hardness) 20,) NMP) 100 parts by stirring was dissolved in 20 parts to obtain a polyamide elastomer solution. Next, the polyamide elastomer solution is added to a polyamideimide varnish (Toyobo Co., Ltd .: Viromax 16NN) dissolved in NMP so that the solid content of the polyamide elastomer is 20 parts with respect to 100 parts of the solid content of the polyamideimide varnish. added. Furthermore, carbon black (manufactured by Degussa: SB-4) is added so as to be 35 parts with respect to 100 parts of the total solid content of the polyamideimide varnish and the polyamide elastomer, and mixed with a sand mill to contain the polyamide elastomer and carbon black. Thus obtained polyamideimide varnish 1 was obtained.

  Next, a cylindrical core body for producing an endless belt was prepared. A hollow cylindrical aluminum member having a thickness of 4 mm was used, and the surface was blasted to a surface roughness Ra = 0.5 μm. Next, a silicone resin mold release agent (Shin-Etsu Chemical Co., Ltd .: SEPA-COAT) is spray-coated on the surface and baked at 320 ° C. for 60 minutes to form a release layer, thereby producing a cylindrical core. did.

The obtained polyamideimide varnish 1 is applied to the cylindrical core body by a flow coating method, transferred to a drying furnace, dried at 120 ° C. for 20 minutes, then heated to 250 ° C. for 60 minutes, and heated to 250 ° C. for 30 minutes. After holding the temperature, it is cooled to 40 ° C., and the endless film is removed by blowing air into the gap between the cylindrical core and the formed endless film, cut to a predetermined width, and the thickness is 82 μm. The endless belt 1 was obtained. The surface resistivity of the endless belt 1 was 3.2 × 10 ¹² Ω / □.

-Evaluation-
(1) Flexibility The flex resistance of the endless belt 1 was evaluated by the following method. The results are shown in Table 1.
As a bending test method, based on JIS-P8115 (2002), the endless belt 1 is cut to a sample width of 13.5 mm and a sample length of 150 mm, a bending test is performed with a load of 1 kgf, and bending resistance is obtained. (Unit: times) was evaluated.

(2) Actual paper running durability The endless belt 1 was mounted as an intermediate transfer belt in a color copying machine DC1250 manufactured by Fuji Xerox Co., Ltd., and a running test up to 500 k sheets was performed. The results are shown in Table 1.

<Example 2>
An endless belt 2 is produced by the method described in Example 1, except that the amount of the polyamide elastomer solution is changed so that the solid content of the polyamide elastomer is 10 parts with respect to 100 parts of the solid content of the polyamideimide varnish. did. The surface resistivity of the endless belt 2 was 5.5 × 10 ¹² Ω / □. The evaluation described in Example 1 was performed.

<Example 3>
An endless belt 3 is produced by the method described in Example 1, except that the amount of the polyamide elastomer solution is changed so that the solid content of the polyamide elastomer is 50 parts with respect to 100 parts of the solid content of the polyamideimide varnish. did. The surface resistivity of the endless belt 3 was 7.4 × 10 ¹² Ω / □. The evaluation described in Example 1 was performed.

<Example 4>
An endless belt 4 is produced by the method described in Example 1, except that the amount of the polyamide elastomer solution is changed so that the solid content of the polyamide elastomer is 55 parts with respect to the solid content of 100 parts of the polyamideimide varnish. did. The surface resistivity of the endless belt 4 was 8.8 × 10 ¹² Ω / □. The evaluation described in Example 1 was performed.
As a result of adding too much polyamide elastomer and becoming too soft, the endless belt 4 has waviness irregularities in the image forming apparatus in (2) actual paper running durability test, and slight image defects are recognized. It was.

<Example 5>
An endless belt 5 is produced by the method described in Example 1, except that the amount of the polyamide elastomer solution is changed so that the solid content of the polyamide elastomer is 8 parts with respect to 100 parts of the solid content of the polyamideimide varnish. did. The surface resistivity of the endless belt 5 was 1.1 × 10 ¹² Ω / □. The evaluation described in Example 1 was performed. .

<Comparative Example 1>
An endless belt 6 was produced by the method described in Example 1 except that the polyamide elastomer solution was not added. The surface resistivity of the endless belt 6 was 8.4 × 10 ¹¹ Ω / □. The evaluation described in Example 1 was performed.

<Comparative example 2>
An endless belt 7 was produced by the method described in Example 1 except that polyimide varnish (trade name: Euvarnish S, manufactured by Ube Industries, Ltd.) was used instead of polyamideimide varnish. The surface resistivity of the endless belt 7 was 1.5 × 10 ¹¹ Ω / □. The evaluation described in Example 1 was performed.

Below, the preferable aspect of this invention is shown. First, the resin composition of the present invention is
<1> A resin composition containing a polyamideimide resin precursor and a polyamide elastomer. By setting it as this structure, the resin molding excellent in the softness | flexibility can be obtained compared with the case where it does not have the structure containing a polyamideimide precursor and a polyamide elastomer.
<2> The resin composition according to <1>, wherein the content of the polyamide elastomer is in a range of 10 parts by mass or more and 50 parts by mass or less in solid content with respect to 100 parts by mass of the precursor of the polyamideimide resin. It is. By setting it as this structure, the resin molding excellent in the softness | flexibility can be obtained compared with the case where content is not considered.
<3> The resin composition according to <1> or <2>, wherein the polyamide elastomer is a polymerized fatty acid-based polyamide elastomer obtained by block copolymerization of polyamide, polyether ester, and polyester. By setting it as this structure, the resin molding excellent in the softness | flexibility can be obtained compared with the case where it does not have this structure.

In addition, the resin molded product of the present invention is
<4> A resin molded product containing a polyamideimide resin and a polyamide elastomer. By setting it as this structure, the outstanding softness | flexibility can be obtained compared with the case where it does not have the structure containing a polyamideimide resin and a polyamide elastomer.

An endless belt for an image forming apparatus of the present invention is
<5> An endless belt for an image forming apparatus containing a polyamideimide resin and a polyamide elastomer. By setting it as this structure, the outstanding softness | flexibility can be obtained compared with the case where it does not have the structure containing a polyamideimide resin and a polyamide elastomer.
<6> The endless belt for an image forming apparatus according to <5>, wherein the surface resistivity is 1.0 × 10 ⁸ Ω / □ or more and 1.0 × 10 ¹⁵ Ω / □ or less. By adopting such a configuration, superior conductivity can be imparted compared to the case where the surface resistivity is not considered.

The belt stretcher of the present invention is
<7> A belt stretch for an image forming apparatus, comprising: the endless belt according to <5> or <6>; and a plurality of stretching members that rotatably stretch the endless belt from the inner surface side. Device. By adopting such a configuration, it is possible to obtain excellent flexibility with respect to circular driving or the like as compared with the case without this configuration.

The image forming apparatus according to the present invention includes:
<8> An image forming apparatus including the endless belt according to <5> or <6>. With this configuration, it is possible to form an image with excellent image quality compared to the case without this configuration.

The roll member of the present invention is
<9> A roll member for an image forming apparatus containing a polyamideimide resin and a polyamide elastomer. By setting it as this structure, the outstanding softness | flexibility can be obtained compared with the case where it does not have the structure containing a polyamideimide resin and a polyamide elastomer.
<10> The roll member for an image forming apparatus according to <9>, wherein the surface resistivity is 1.0 × 10 ⁶ Ω / □ or more and 1.0 × 10 ¹³ Ω / □ or less. By adopting such a configuration, superior conductivity can be imparted compared to the case where the surface resistivity is not considered.

The process cartridge of the present invention is
<11> A process cartridge formed to be detachable from the image forming apparatus and having the roll member according to <9> or <10>. By adopting such a configuration, it is possible to improve the handleability of the roll member having excellent flexibility as compared with the case where this configuration is not provided.

The image forming apparatus according to the present invention includes:
<12> An image forming apparatus including the roll member according to <9> or <10>. With this configuration, it is possible to form an image with superior image quality compared to the case without this configuration.

It is the schematic plan view (a) and schematic sectional drawing (b) which show an example of the circular electrode which measures surface resistivity. 1 is a schematic configuration diagram illustrating an example of an image forming apparatus of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Intermediate transfer body 30 Image holding body 34 Bias roller 36 Recording medium storage part 38, 40, 42, 44 Developing device 46 Belt cleaner 48, 50, 54 Support roll 52 Conductive roller 56 Backup roller 58 Electrode roller 62 Peeling claw 64 Feed Roller 66 Pickup roller 68 Recording medium 70 Cleaning blade 80 Image forming apparatus 90 Belt stretcher

Claims (10)

  A resin composition comprising a polyamideimide resin precursor and a polyamide elastomer.   2. The resin composition according to claim 1, wherein the content of the polyamide elastomer is in a range of 10 parts by mass or more and 50 parts by mass or less in solid content with respect to 100 parts by mass of the precursor of the polyamideimide resin. object.   The resin composition according to claim 1 or 2, wherein the polyamide elastomer is a polymerized fatty acid-based polyamide elastomer obtained by block copolymerization of polyamide, polyether ester, and polyester.   A resin molded product comprising a polyamideimide resin and a polyamide elastomer.   An endless belt for an image forming apparatus, comprising a polyamideimide resin and a polyamide elastomer.   6. A belt stretching apparatus for an image forming apparatus, comprising: the endless belt according to claim 5; and a plurality of stretching members that rotatably stretch the endless belt from an inner surface side.   An image forming apparatus comprising the endless belt according to claim 5.   A roll member for an image forming apparatus, comprising a polyamideimide resin and a polyamide elastomer.   9. A process cartridge that is detachably formed on an image forming apparatus and has the roll member according to claim 8.   An image forming apparatus comprising the roll member according to claim 8.

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