JP2009056749A - Core body for molding, seamless tubular article and its producing method, and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control swelling of a seamless tubular article and improve reliability of releasing property from a core body for molding. <P>SOLUTION: A core body for molding 10 has a base material 11 and a releasing layer 14 formed on a surface of the base material 11. A plurality of low water contact regions 12 in which a water contact angle is 30 to 50° are provided in the releasing layer 14. Area per one of the low water contact regions 12 is 0.05 to 3.0 cm<SP>2</SP>, and the total area of the low water contact regions 12 is 3 to 30% of the whole area of the releasing layer 14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seamless tubular material (seamless belt, seamless tube) preferably used for a transfer belt, a transfer roller, and a fixing belt of an image forming apparatus using an electrophotographic system such as a copying machine or a printer, a method for manufacturing the same, and the above seamless The present invention relates to a molding core used for manufacturing a tubular product and an image forming apparatus provided with the seamless tubular product.

  For example, in an electrophotographic apparatus, a rotating body made of metal, various plastics, or rubber is used for a photoreceptor, a transfer belt, a fixing belt, or the like. In order to reduce the size and improve the performance of the device, it may be preferable that these rotating bodies be deformable to some extent. In that case, a tubular body made of a plastic film having a small thickness is used. At that time, if there is a seam in the tubular object, a defect due to the seam may occur in the image. Therefore, there is a high demand for using a tubular object without a seam.

  Regarding a method for producing a seamless tubular material, for example, Patent Document 1 describes a method of forming a film on the inner peripheral surface of a mold by a rotational molding method, and Patent Document 2 describes dipping a resin solution on the outer surface of a cylindrical core body. Describes a method in which the film is applied to a constant thickness and the core body is pulled out after the heating film formation.

  Examples of the resin material that forms the seamless tubular material described above include polyimide, polyamideimide, polyamide, polyetherimide, polyetheretherketone, and polyphenylene sulfide. Of these, polyimide resins are particularly preferable from the viewpoint of strength, heat resistance, and dimensional stability, and are used for forming seamless tubular materials.

  Moreover, in the seamless tubular product manufacturing method, metals such as aluminum and stainless steel are generally used as the core material. However, since the polyimide resin is a resin used as an adhesive, a polyimide precursor solution is used. When applied to the core and converted to imide by heating, the polyimide tubular product adheres to or adheres to the core. As a result, the core is soiled by the remaining film and cannot be used repeatedly. In the worst case, the polyimide tubular material cannot be removed.

  In view of this, a method has been proposed in which a release layer is provided on the surface of the core body to smoothly separate the core body and the seamless tubular material, thereby reducing the adhesive energy of the surface. However, for example, when a polyimide precursor solution is applied to a core having a release layer and then heated to convert the precursor to an imide to obtain a polyimide resin tubular product, a polyimide precursor solution solvent is used during heating. Since the N-methyl-2-pyrrolidone (NMP) volatilizes and the water vapor generated by imide conversion causes swelling and shrinkage, the resulting seamless tubular product has uneven film thickness. Cause. The occurrence of such swelling and shrinkage of the molded body becomes more remarkable when the size of the seamless tubular body (for example, belt) to be manufactured is, for example, φ60 mm or more. When the seamless tubular material is used as a transfer belt, there is a problem that the transfer belt cannot function, such as image transfer failure. When both ends of the seamless tubular product are flared, the flared portion is cut to obtain a seamless tubular product of the final product, while both ends of the seamless tubular product are not flared. Therefore, there is no need for further processing, and the seamless tubular product is obtained as it is.

  In Patent Document 3, a tubular body made of polyimide resin is used by using a metal core covered with an inorganic coating coating layer made of an alkoxide compound of at least one element selected from Si, Ti, Al, and Zr. Manufacturing is described. Patent Document 4 describes that an endless belt is manufactured using a core on which a fluororesin coating is formed. However, even in the case of these core bodies, the adhesion between the seamless tubular body and the core body cannot be sufficiently prevented, and the resulting seamless tubular body is shrunk and swollen. High dimensional stability cannot be obtained.

JP-A-60-170862 JP-A-6-222695 JP-A-7-76025 Japanese Patent Laid-Open No. 2001-158023

  This suppresses the swelling of the seamless tubular material and improves the reliability of the mold release of the core for molding.

  The molding core, the seamless tubular product, the manufacturing method thereof, and the image forming apparatus of the present invention have the following characteristics.

(1) It has a base material and a release layer formed on the surface of the base material, and the release layer is provided with a plurality of regions having a water contact angle of 30 ° or more and 50 ° or less, the region area per one is at 0.05 cm ² or more 3.0 cm ² or less, and, in the molding core total area is 30% or less than 3% of the total area of the release layer of the region is there.

  (2) The molding core according to (1), wherein the region is 3 to 30% in an area of 10 cm × 10 cm square of the release layer.

  (3) The mold release layer is the molding core according to (1) above, which contains a silicone resin.

  (4) The forming core according to (1), wherein the regions are scattered in the release layer, and a pitch width of adjacent regions is 10 mm or more and 60 mm or less.

(5) It has a base material and a release layer formed on the surface of the base material, and the release layer is provided with a plurality of regions having a water contact angle of 30 ° or more and 50 ° or less. One area per is at 0.05 cm ² or more 3.0 cm ² or less, and contains a resin on the surface of the core member the total area is 30% or less than 3% of the area of the release layer of the region It is the manufacturing method of the seamless tubular thing which has the application | coating process which apply | coats a solution.

(6) a substrate and a release layer formed on the surface of the substrate, wherein the release layer is provided with a plurality of regions having a water contact angle of 30 ° or more and 50 ° or less; One area per is at 0.05 cm ² or more 3.0 cm ² or less, and contains a resin on the surface of the core member the total area is 30% or less than 3% of the area of the release layer of the region A seamless tubular product formed by applying a solution.

  (7) The seamless tubular product according to (6), wherein the resin in the solution containing the resin is a polyimide resin.

  (8) The seamless tubular product according to the above (6) or (7), which is a seamless tubular product having a difference between the maximum value and the minimum value of the film thickness in the axial direction of 7 μm or less.

  (9) An image carrier, charging means for charging the surface of the image carrier, latent image forming means for forming a latent image on the surface of the image carrier, and developing the latent image with toner to form a toner image. A developing unit; a transfer unit that transfers the toner image to a recording medium; and a fixing unit that fixes the toner image to the recording medium. The transfer unit or the fixing unit includes the above (7) or (8). It is an image forming apparatus provided with the seamless tubular thing of description.

  The molding core according to the first aspect of the present invention is a core in which a release layer is formed on the outer surface or the inner surface, and a plurality of regions having a surface energy difference are provided in the release layer. The high surface energy region (that is, the low water contact angle region) has a sticking force to such an extent that the seamless tubular product can be separated without being in close contact with the molding core. Swelling and contraction are suppressed. Further, the relatively low surface energy region (that is, the region other than the low water contact angle) is a volatile solvent gas generated at the boundary between the molding core and the seamless tubular product when the seamless tubular product is heat-cured. In addition, the volatile solvent gas pressure and the water vapor pressure are discharged from the end of the seamless tubular article into the outside air atmosphere, thereby preventing swelling.

  Further, according to the molding core of the invention according to claim 3 of the present application, since the release layer is a silicone-based resin composition, it has heat resistance that can withstand the forming temperature of the seamless tubular product, and for molding. It becomes easy to control the water contact angle on the surface of the core. As a method for controlling the water contact angle, for example, there are solid content adjustment of the silicone resin composition, ultraviolet irradiation treatment and the like.

  According to the molding cores of the inventions according to claims 2 and 4 of the present invention, since the relatively high surface energy region (that is, the low water contact angle region) is scattered almost uniformly, the seamless tubular product is compared with the conventional one. Since the shrinkage of the molded product is suppressed and relatively low surface energy regions (ie, regions other than the low water contact angle) are scattered almost uniformly, a seamless tubular product with high mold accuracy and high dimensional accuracy is formed. can do.

  According to the method for producing a seamless tubular product of the invention according to claim 5 of the present invention, the two types of regions having the surface energy difference are allowed to coexist, thereby suppressing the expansion and contraction of the seamless tubular product, and the seamless tubular product. A seamless tubular product having high dimensional accuracy can be formed by suppressing excessive adhesion between the formed body and the formed core body.

  In addition, according to the present invention, excessive adhesion between the molding core and the seamless tubular product molded body is suppressed, and the shrinkage and swelling of the seamless tubular product molded body are suppressed, so that film formation stability and high dimensional accuracy are achieved. It is possible to provide a molding core body for a seamless tubular product that can be achieved and has little dirt on the molded body core and can be used repeatedly.

  Embodiments of the present invention will be described below.

[Molding core]
As shown in FIG. 1, the molding core 10 of the present embodiment has a base material 11 and a release layer 14 formed on the surface of the base material 11. A plurality of relatively high surface energy regions having a contact angle of 30 ° or more and 50 ° or less, that is, low water contact angle regions 12 are provided, and the area per low water contact angle region 12 is 0.05 cm ² or more and 3 .0cm ² or less, and the total area of low water contact angle region 12 is 30% or less than 3% of the total area of the release layer 14. As shown in FIG. 1, the part where the release layer 14 is exposed is a relatively low surface energy region (that is, a region other than the low water contact angle).

  In the core 10 for molding, when the water contact angle of the low water contact angle region 12 is less than 30 °, the seamless tubular product and the core are easily brought into close contact with each other. The peelability of the deteriorates. On the other hand, when the water contact angle of the low water contact angle region 12 exceeds 50 °, the molding is performed at the time of heat curing, particularly at the time of imide conversion by heating when the molded body is a seamless tubular molded body made of polyimide resin. The surface of the core body 10 (particularly the central surface of the molding core body 10) and the seamless tubular product molded body are not in close contact, and solvent gas and water vapor volatilized from the resin-containing solution applied to the molding core body 10 It stays in the space between the surface of the molding core 10 and the seamless tubular product, and as a result, the seamless tubular product is swollen.

  In addition, the water contact angle is measured using a contact angle meter “CA-X” (manufactured by Kyowa Interface Science Co., Ltd.) using a pure water droplet of 3.1 μl and a maximum contact angle θ within 15 seconds after the droplet. The average value of the maximum values of the contact angles θ measured by measuring the values and dividing into four in the circumferential direction of the core was taken as the water contact angle. The water contact angle θ indicates higher water wettability as it approaches 0 °.

When the area per low water contact angle region 12 is less than 0.05 cm ² , the seamless tubular product and the core are easily adhered, and the peelability between the core and the seamless tubular product is easy. Becomes worse. On the other hand, when the area per low water contact angle region 12 exceeds 3.0 cm ² , the imide conversion by heating is performed at the time of heat curing, particularly when the molded body is a seamless tubular molded body made of polyimide resin. Occasionally, the surface of the molding core 10 (particularly the surface of the central portion of the molding core 10) and the seamless tubular product molding are not in close contact, and the solvent gas volatilized from the resin-containing solution applied to the molding core 10 And water vapor stay in the space between the surface of the molding core 10 and the seamless tubular product, resulting in swelling of the seamless tubular product.

When the total area of the low water contact angle region 12 is less than 3% of the total area of the release layer 14, the seamless tubular product and the core are easily adhered to each other. The peelability of the deteriorates. On the other hand, when the area per low water contact angle region 12 exceeds 3.0 cm ² , the imide conversion by heating is performed at the time of heat curing, particularly when the molded body is a seamless tubular molded body made of polyimide resin. Occasionally, the surface of the molding core 10 (particularly the surface of the central portion of the molding core 10) and the seamless tubular product molding are not in close contact, and the solvent gas volatilized from the resin-containing solution applied to the molding core 10 And water vapor stay in the space between the surface of the molding core 10 and the seamless tubular product, resulting in swelling of the seamless tubular product.

  Moreover, it is preferable that the low water contact angle area | region 12 exists 3-30% within the area of 10 cm x 10 cm square of the release layer 14. FIG. Moreover, as shown in FIG. 3, it is preferable that the low water contact angle area | region 12 is scattered in the release layer 14, and the pitch width 18 of the adjacent low water contact angle area | region 12 is 10 mm or more and 60 mm or less. As described above, since a relatively high surface energy region (that is, a low water contact angle region) is scattered on the release layer 14, the shrinkage and swelling of the seamless tubular product molded body are suppressed as compared with the conventional case. .

  When one shape of the low water contact angle region 12 is, for example, a circle, the diameter is preferably 3 mm or more and 18 mm or less. When the thickness is less than 3 mm, the surface of the molding core 10 (particularly the central portion of the molding core 10) at the time of heat curing, particularly when the molded body is a polyimide resin seamless tubular molded body, at the time of imide conversion by heating. The surface) and the seamless tubular product molded body are not in close contact, and the solvent gas and water vapor volatilized from the resin-containing solution applied to the molding core 10 cause the surface of the molding core 10 and the seamless tubular product molded body to It stays in the space between, and as a result, a swelling arises in the center part of a seamless tubular thing. On the other hand, when it exceeds 18 mm, the seamless tubular product molded body and the core are easily adhered, and the peelability between the core and the seamless tubular molded product is deteriorated.

  Further, the release layer 14 formed on the surface of the molding core 10 shown in FIG. 1 is formed on the outer surface or the inner surface of the base material 11, and the release layer 14 further contains a silicone resin. preferable. Furthermore, as described above, when the release layer 14 is a silicone resin so that the water contact angle of the low water contact angle regions 12 scattered in the molding core 10 is 30 ° or more and 50 ° or less, The water contact angle is adjusted by adjusting the solid content of the resin composition or by controlling the time of ultraviolet irradiation treatment.

  The release layer 14 formed on the surface of the cylindrical substrate 11 in the present embodiment contains a heat-resistant resin, and the heat-resistant resin is preferably the above-described silicone resin, specifically a silicone resin (SEPA). -COAT (manufactured by Shin-Etsu Chemical Co., Ltd.)). The water contact angle of the release layer 14 is 90 ° or more and 100 ° or less. Moreover, the release layer 14 containing a silicone resin is formed on the surface of the substrate 11 by applying a silicone resin composition to the core body by spraying or dipping or the like and baking it.

  The material of the base material 11 should just be a metal, and metals, such as aluminum, zinc, copper, stainless steel, nickel, are preferable. When the material of the core is aluminum, zinc, or copper, it may be plated with chromium or nickel so that the outer peripheral surface is hardly damaged. The cylindrical core body is preferably aluminum or an aluminum-based alloy considering that the tubular body can be easily demolded due to the thermal expansion coefficient. For example, aluminum (JIS H4080 alloy number 1000 series pure aluminum) ), JIS H4080 alloy number 3000 series aluminum-manganese (Al-Mn) series alloy, JIS H4080 alloy number 5000 series aluminum-magnesium (Al-Mg) series alloy, JIS H4080 alloy number 6000 series aluminum-magnesium-silicon (Al--) Mg-Si) -based alloys are mentioned, but JIS H4080 alloy number 3000 series aluminum-manganese alloy, JIS H4080 alloy number 5000 series aluminum-magnesium from the viewpoint of excellent shape retention and workability at high temperatures. Alloy is more preferable. Furthermore, the surface of the base material 11 is provided with an uneven shape by blasting. Moreover, although the shape of the base material 11 is preferable cylindrical shape, it is not restricted to this.

[Method for producing seamless tubular product]
Next, a method for producing a belt tubular article using the molding core will be described below.

  In the present embodiment, a belt tubular article is produced using at least four steps of a mold release layer forming step, a coating film forming step, a film forming step, and a peeling / extracting step, using a molding core. Other steps may be included depending on the situation. In addition, the seamless tubular product produced using the present embodiment is a seamless tubular product based on a film that undergoes heat shrinkage, such as at least a polyimide resin layer. You may be comprised from the layer or more. In the latter case, a seamless tubular product is produced so that a film to be the film layer is formed on the outer periphery of the molding core. In the following description, each process will be described on the assumption of a single layer.

― Release layer formation process ―
If the release layer 14 is formed on the outer peripheral surface or the inner peripheral surface of at least the central portion of the cylindrical core body in accordance with the formation of the outer peripheral surface of the molding core of the seamless tubular product or the peripheral surface formation of the cylindrical core body. Although it is good, in order to make easy peeling of the polyimide resin film in an edge part, it is desirable to form also in any one edge part or both ends. The release agent layer is formed as described above.

-Coating film formation process (polyimide precursor coating process)-
After the mold release agent layer forming step, for example, a polyimide precursor solution is applied to the outer peripheral surface from the central part where the low water contact angle region of the molding core 10 shown in FIG. The coating film formation process which forms a coating film is performed by apply | coating. A conventionally well-known thing can be used as a polyimide precursor. Hereinafter, although the coating-film formation method using a polyimide precursor is described, it cannot be overemphasized that a polyamide-imide resin, polyetheretherketone (PEEK), etc. may be used.

As shown in FIG. 2, the coating film forming step of the seamless tubular product manufacturing method in the present embodiment has a cylindrical base material 11 and a release layer 14 formed on the surface of the base material 11. The release layer 14 is provided with a plurality of relatively high surface energy regions having a water contact angle of 30 ° or more and 50 ° or less, that is, a plurality of low water contact angle regions 12. area is at 0.05 cm ² or more 3.0 cm ² or less, and a low water contact angle molding core 10 the total area is 30% or less than 3% of the total area of the release layer 14 in the region 12 of the It has the application | coating process which apply | coats the solution containing resin to the surface. Here, “the surface of the base material 11” means to include the outer surface and the inner surface of the base material 11, and “the surface of the molding core body 10” means the outer surface of the molding core body 10. And includes the inner surface. Accordingly, when the seamless tubular product is formed on the outer surface of the molding core 10, a solution containing a release layer on the outer surface of the substrate 11 and containing a resin on the outer surface of the molding core 10. Apply. On the other hand, when the seamless tubular product is formed on the inner surface of the molding core 10, a solution containing a release layer on the inner surface of the substrate 11 and containing a resin on the inner surface of the molding core 10. Apply.

  Furthermore, it demonstrates in detail using FIG. FIG. 2 shows an example in which a seamless tubular product is formed on the outer surface of the molding core 10. In the coating step, a seamless tubular product is formed over the central portion formed in the low water contact angle region 12 of the molding core 10 and part of the end portions of only the release layers 14 on both sides thereof. Over the region 16, a solution containing a resin described later is applied.

  Here, the polyimide precursor solution is a polyamic obtained by polymerizing 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride (BPDA) and oxydianiline (ODA) in an organic polar solvent. An acid solution (Upilex R: manufactured by Ube Industries, Ltd.), 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride (BPDA) and p-phenylinediamine (PPA) are polymerized in an organic polar solvent. There is a polyamic acid solution (Upilex S: manufactured by Ube Industries, Ltd.) obtained by reaction. The polyamideimide resin solution is Viromax 16NN (manufactured by Toyobo Co., Ltd.).

  The polyimide precursor solution described above is prepared as follows. First, a polyamic acid solution is obtained by polymerizing a tetracarboxylic dianhydride and a diamine compound in an organic polar solvent.

[Tetracarboxylic dianhydride]
There is no restriction | limiting in particular as tetracarboxylic dianhydride which can be used for manufacture of a polyamic acid, Either an aromatic type or an aliphatic type compound can be used.

  Examples of the aromatic tetracarboxylic acid include pyromellitic dianhydride, 3,3 ′, 4,4′-benzoenone tetracarboxylic dianhydride, 3,3 ′, 4,4′-biphenyl sulfone. Tetracarboxylic dianhydride, 1,4,5,8-naphthalenetetracarboxylic dianhydride, 2,3,6,7-naphthalenetetracarboxylic dianhydride, 3,3 ′, 4,4′-biphenyl Ether tetracarboxylic dianhydride, 3,3 ′, 4,4′-dimethyldiphenylsilane tetracarboxylic dianhydride, 3,3 ′, 4,4′-tetraphenylsilane tetracarboxylic dianhydride, 1, 2,3,4-furantetracarboxylic dianhydride, 4,4′-bis (3,4-dicarboxyphenoxy) diphenyl sulfide dianhydride, 4,4′-bis (3,4-dicarboxyphenoxy) Diphenylsulfo Dianhydride, 4,4'-bis (3,4-dicarboxyphenoxy) diphenylpropane dianhydride, 3,3 ', 4,4'-perfluoroisopropylidenediphthalic dianhydride, 3,3' , 4,4'-biphenyltetracarboxylic dianhydride, bis (phthalic acid) phenylphosphine oxide dianhydride, p-phenylene-bis (triphenylphthalic acid) dianhydride, m-phenylene-bis (triphenylphthal Acid) dianhydride, bis (triphenylphthalic acid) -4,4′-diphenyl ether dianhydride, bis (triphenylphthalic acid) -4,4′-diphenylmethane dianhydride, and the like.

  Aliphatic tetracarboxylic dianhydrides include butane tetracarboxylic dianhydride, 1,2,3,4-cyclobutane tetracarboxylic dianhydride, 1,3-dimethyl-1,2,3,4-cyclobutane. Tetracarboxylic acid, 1,2,3,4-cyclopentanetetracarboxylic dianhydride, 2,3,5-tricarboxycyclopentylacetic acid dianhydride, 3,5,6-tricarboxynorbonane-2-acetic acid dianhydride Anhydride, 2,3,4,5-tetrahydrofurantetracarboxylic dianhydride, 5- (2,5-dioxotetrahydrofural) -3-methyl-3-cyclohexene-1,2-dicarboxylic dianhydride, An aliphatic or alicyclic tetracarboxylic dianhydride such as bicyclo [2,2,2] -oct-7-ene-2,3,5,6-tetracarboxylic dianhydride; 4 5,9b-Hexahydro-2,5-dioxo-3-furanyl) -naphtho [1,2-c] furan-1,3-dione, 1,3,3a, 4,5,9b-hexahydro-5-methyl -5- (Tetrahydro-2,5-dioxo-3-furanyl) -naphtho [1,2-c] furan-1,3-dione, 1,3,3a, 4,5,9b-hexahydro-8-methyl Examples include aliphatic tetracarboxylic dianhydrides having an aromatic ring such as -5- (tetrahydro-2,5-dioxo-3-furanyl) -naphtho [1,2-c] furan-1,3-dione. Can do.

  As tetracarboxylic dianhydride, aromatic tetracarboxylic dianhydride is preferable, and pyromellitic dianhydride, 3,3 ′, 4,4′-benzophenone tetracarboxylic dianhydride, 3, 3 ', 4,4'-biphenylsulfone tetracarboxylic dianhydride is optimally used.

  These tetracarboxylic dianhydrides can be used alone or in combination of two or more.

[Diamine compound]
Next, the diamine compound that can be used for producing the polyamic acid is not particularly limited as long as it is a diamine compound having two amino groups in the molecular structure.

  For example, p-phenylenediamine, m-phenylenediamine, 4,4′-diaminodiphenylmethane, 4,4′-diaminodiphenylethane, 4,4′-diaminodiphenyl ether, 4,4′-diaminodiphenyl sulfide, 4,4 ′ -Diaminodiphenylsulfone, 1,5-diaminonaphthalene, 3,3-dimethyl-4,4'-diaminobiphenyl, 5-amino-1- (4'-aminophenyl) -1,3,3-trimethylindane, 6 -Amino-1- (4'-aminophenyl) -1,3,3-trimethylindane, 4,4'-diaminobenzanilide, 3,5-diamino-3'-trifluoromethylbenzanilide, 3,5- Diamino-4′-trifluoromethylbenzanilide, 3,4′-diaminodiphenyl ether, 2,7- Aminofluorene, 2,2-bis (4-aminophenyl) hexafluoropropane, 4,4'-methylene-bis (2-chloroaniline), 2,2 ', 5,5'-tetrachloro-4,4' -Diaminobiphenyl, 2,2'-dichloro-4,4'-diamino-5,5'-dimethoxybiphenyl, 3,3'-dimethoxy-4,4'-diaminobiphenyl, 4,4'-diamino-2, 2′-bis (trifluoromethyl) biphenyl, 2,2-bis [4- (4-aminophenoxy) phenyl] propane, 2,2-bis [4- (4-aminophenoxy) phenyl] hexafluoropropane, 1 , 4-bis (4-aminophenoxy) benzene, 4,4′-bis (4-aminophenoxy) -biphenyl, 1,3′-bis (4-aminophenoxy) benzene, , 9-bis (4-aminophenyl) fluorene, 4,4 ′-(p-phenyleneisopropylidene) bisaniline, 4,4 ′-(m-phenyleneisopropylidene) bisaniline, 2,2′-bis [4- ( Aromatic aminodiamines such as 4-amino-2-trifluoromethylphenoxy) phenyl] hexafluoropropane, 4,4′-bis [4- (4-amino-2-trifluoromethyl) phenoxy] -octafluorobiphenyl; An aromatic diamine having two amino groups bonded to an aromatic ring such as tetraphenylthiophene and a hetero atom other than the nitrogen atom of the amino group; 1,1-metaxylylenediamine, 1,3-propanediamine, tetra Methylenediamine, pentamethylenediamine, octamethylenediamine, nonamethylenediamine, 4, 4-diaminoheptamethylenediamine, 1,4-diaminocyclohexane, isophoronediamine, tetrahydrodicyclopentadienylenediamine, hexahydro-4,7-methanoindanylenediethylenediamine, tricyclo [6,2,1,02. 7] -undecylenedimethyldiamine, aliphatic diamines such as 4,4′-methylenebis (cyclohexylamine), and alicyclic diamines.

  As the diamine compound, p-phenylenediamine, 4,4'-diaminodiphenylmethane, 4,4'-diaminodiphenyl ether, 4,4'-diaminodiphenyl sulfide, and 4,4'-diaminodiphenyl sulfone are preferable.

  These diamine compounds can be used alone or in combination of two or more.

[Combination of tetracarboxylic dianhydride and diamine compound]
As a polyamic acid, Preferably, what consists of aromatic tetracarboxylic dianhydride and aromatic diamine from a viewpoint of the intensity | strength of a molded object is preferable.

[Organic polar solvent]
Examples of the organic polar solvent used in the polyamic acid production reaction include sulfoxide solvents such as dimethyl sulfoxide and diethyl sulfoxide, formamide solvents such as N, N-dimethylformamide and N, N-diethylformamide, acetamide, Acetamide solvents such as N, N-dimethylacetamide and N, N-diethylacetamide, pyrrolidone solvents such as N-methyl-2-pyrrolidone and N-vinyl-2-pyrrolidone, phenol, o-, m-, or p -Phenol solvents such as cresol, xylenol, halogenated phenol and catechol; ether solvents such as tetrahydrofuran, dioxane and dioxolane; alcohol solvents such as methanol, ethanol and butanol; cellosolve solvents such as butyl cellosolve There can be exemplified hexamethylphosphoramide, .gamma.-butyrolactone and the like, it is desirable to use them alone or as a mixture, further xylene, aromatic hydrocarbons such as toluene can be used. The solvent is not particularly limited as long as it dissolves polyamic acid and polyamic acid-polyimide copolymer. A conventionally known aprotic polar solvent is used, and the concentration, viscosity and the like of the polyamic acid solution are appropriately selected.

  Conductive fine particles are further added to and dispersed in the polyamic acid solution prepared by the above-described method to prepare a dispersion. The dispersion is passed through a collision type disperser shown in FIG. FIG. 5 is an explanatory view of a collision type disperser. Two first flow path pipes 50 connected at one point from upstream to downstream, a connection pipe 52 constituting a connection part, and one end of the connection pipe 52. The liquid is dispersed by flowing the solution through a flow path constituted by a second flow path pipe 54 branched into two or more.

[Conductive fine particles]
As the conductive fine particles, conductive or semiconductive fine powder can be used, and there is no particular limitation as long as the desired electric resistance can be stably obtained. However, carbon black such as Ketchen Black and Acetylene Black, aluminum Examples thereof include metals such as nickel and metal, metal oxide compounds such as tin oxide, and potassium titanate. These may be used alone or in combination. In the present invention, in consideration of the dispersibility in the resin, the dispersion stability, the resistance variation of the semiconductive polyimide seamless tubular material, the electric field dependency, and the stability of the electrical resistance over time, the oxidized carbon black having a pH of 5 or less. Is preferably added.

  As a dispersion method, a known method can be applied, and examples thereof include a pole mill, a sand mill, a basket mill, and ultrasonic dispersion.

[Oxidized carbon black]
Oxidized carbon black can be produced by oxidizing carbon black to impart a carboxyl group, a quinone group, a lactone group, a hydroxyl group, or the like to the surface. This oxidation treatment is an air oxidation method in which contact is made with air in a high-temperature atmosphere to react, a method of reacting with nitrogen oxides or ozone at room temperature, and air oxidation at high temperature, followed by ozone oxidation at a low temperature. It can be performed by a method or the like. Specifically, the oxidized carbon black can be produced by a contact method. Examples of the contact method include a channel method and a gas black method. Oxidized carbon black can also be produced by a furnace black method using gas or oil as a raw material. If necessary, after these treatments, a liquid phase oxidation treatment with nitric acid or the like may be performed. Acidic carbon black can be produced by a contact method, but is usually produced by a closed furnace method. In the furnace method, only carbon black having a high pH and a low volatile content is usually produced, but the pH can be adjusted by subjecting it to the above-mentioned liquid phase acid treatment. For this reason, the carbon black obtained by the furnace method manufacturing and adjusted to have a pH of 5 or less by the post-treatment is also considered to be included in the present invention.

  The pH value of the oxidation-treated carbon black is pH 5.0 or less, preferably pH 4.5 or less, more preferably pH 4.0 or less. Oxidized carbon having a pH of 5.0 or less has an oxygen-containing functional group such as a carboxyl group, a hydroxyl group, a quinone group, and a lactone group on the surface, so that it has good dispersibility in the resin, and thus good dispersion stability is obtained. The resistance variation of the semiconductive polyimide seamless tubular material can be reduced, the electric field dependency is also reduced, and the electric field concentration due to the transfer voltage is difficult to occur.

  Here, pH is calculated | required by adjusting the aqueous suspension of carbon black and measuring with a glass electrode. Moreover, pH of acidic carbon black can be adjusted with conditions, such as processing temperature in an oxidation treatment process, and processing time.

  The oxidized carbon black preferably contains 1 to 25% by weight, preferably 2 to 20% by weight, more preferably 3.5 to 15% by weight of the volatile component. When the volatile content is less than 1% by weight, the effect of the oxygen-containing functional group attached to the surface is lost, and the dispersibility in the binder resin may be reduced. On the other hand, if it is higher than 25% by weight, it will decompose when dispersed in the binder resin, or the amount of water adsorbed on the oxygen-containing functional group on the surface will increase, resulting in Problems such as poor appearance may occur. Therefore, the dispersion | distribution in binder resin can be made more favorable by making a volatile content into the said range. This volatile content can be determined from the ratio of organic volatile components (carboxyl group, hydroxyl group, quinone group, lactone group, etc.) that come out when carbon black is heated at 950 ° C. for 7 minutes.

  Specific examples of the oxidation-treated carbon black include “Printex 150T” (pH 4.5, volatile content 10.0% by weight) and “Special Black 350” (pH 3.5, volatile content 2.2) manufactured by Degussa. %), “Special Black 100” (pH 3.3, volatile content 2.2% by weight), “Special Black 250” (pH 3.1, volatile content 2.0% by weight), “Special Black 5”. (PH 3.0, volatile matter 15.0% by weight), “Special Black 4” (pH 3.0, volatile matter 14.0% by weight), “Special Black 4A” (pH 3.0, volatile matter 14.0) %), “Special Black 550” (pH 2.8, volatile content 2.5% by weight), “Special Black 6” (pH 2.5, volatile content 18.0% by weight), “Color Black FW2”. 0 ”(pH 2.5, volatile content 20.0% by weight),“ Color Black FW2 ”(pH 2.5, volatile content 16.5% by weight),“ Color Black FW2V ”(pH 2.5, volatile content 16) .5 wt%), “MONARCH 1000” manufactured by Cabot (pH 2.5, volatile content 9.5 wt%), “MONARCH 1300” manufactured by Cabot (pH 2.5, 9.5 wt% volatile content), “ “MONARCH1400” (pH 2.5, volatile matter 9.0 wt%), “MOGUL-L” (pH 2.5, volatile matter 5.0 wt%), “REGAL400R” (pH 4.0, volatile content 3.5) Weight%) and the like.

  Conductive fine particle-dispersed polyamic, which is a polyimide precursor solution, is synthesized by reacting 100 parts by weight of an organic polar solvent with 5 to 40 parts by weight of polyamic acid and 2 to 16 parts by weight of carbon black to synthesize polyamic acid. An acid composition was obtained.

  Next, as a method of applying the polyimide precursor solution to the outer peripheral surface of the cylindrical core, a dip coating method in which the cylindrical core is dipped in the polyimide precursor solvent and pulled up, while rotating the core in the horizontal direction, A flow coating method in which a solvent is discharged onto the surface, a blade coating method in which a coating film is metalized with a blade, and other known methods can be employed.

― Film formation process ―
The film forming process includes a drying process for drying the polyimide precursor solution and a heating process for heating and baking. The polyimide precursor coating film formed on the outer peripheral surface of the core is preferably dried at a drying temperature of 50 to 100 ° C. and a drying time of 30 to 200 minutes. When dripping occurs in the polyimide precursor coating film due to the influence of gravity before drying, it is preferable to rotate the core in the axial direction at 10 to 500 rpm.

  At the time after drying, the polyimide precursor coating film contains about 10-40% of the initial content of the solvent, and the coating film still has flexibility. Therefore, the coating film cannot be removed from the core and does not retain the strength as a tubular object.

  Subsequently, it is preferable that the heating conditions for forming the polyimide precursor film by heating and baking the polyimide precursor coating film are performed at 350 to 450 ° C. for 20 to 60 minutes. At that time, it is preferable to increase the temperature stepwise or gradually at a constant rate, rather than immediately increasing the temperature until the temperature is reached so that the film does not easily swell.

  The polyimide resin contracts with a strong force when it undergoes a condensation reaction by heating. The present invention is characterized in that a gas escape passage for gas generated during heating is secured by using the contraction. Therefore, abnormal outer diameter abnormalities such as belt swelling and film thickness unevenness of seamless tubular objects can be suppressed.

― Peeling / extraction process ―
After cooling the core, either remove the coating from the core and then cut both ends of the coating, or cut both ends of the coating on the core and then remove the coating from the core to seamless tubular material Can be obtained. Alternatively, the resin is removed from the mold, and the obtained seamless tubular product may be further subjected to slit processing, punching drilling processing, tape winding processing, and the like as necessary.

[Seamless tubular material]
The seamless tubular product in the present embodiment is formed on the center portion where the low water contact angle region 12 of the molding core 10 shown in FIG. 2 is formed and part of the end portions of only the release layers 14 on both sides thereof. That is, it is molded by applying a solution containing a resin over the seamless tubular product formed region 16.

  Further, the seamless tubular object in the present embodiment is a seamless tubular object characterized in that the difference between the maximum value and the minimum value of the film thickness in the axial direction is 7 μm or less. The film thickness can be measured using an eddy current meter Isoscope MP30 (manufactured by Fisher Instruments Co., Ltd.) by placing an aluminum plate as a base on the inner surface of the obtained seamless tubular material. The measurement point is set to a pitch of 10 mm with respect to the axial direction, and the difference between the maximum value and the minimum value per axial direction is calculated. The difference between the maximum value and the minimum value is preferably 7 μm or less. When the difference exceeds 7 μm, image deviation due to the peripheral speed difference of the belt and density unevenness due to the volume resistance value difference occur.

In addition, the seamless tubular material of the present embodiment is preferably a resin material having a small circumferential length variation, that is, a Young's modulus of 3,000 N / mm ² or more. Examples of the resin material having a Young's modulus of 3,000 N / mm ² or more include polyimide resin, polyamideimide resin, polyether ether ketone (PEEK), and the like. An imide resin is preferable as a belt material. For example, when a carbon black is dispersed in a polybiphenyltetracarboxylic acid imide resin material such as Upilex S of Ube Industries, Ltd. as a polyimide resin, the Young's modulus is 6,200 N / mm. ² and the belt substrate thickness of 70 μm to 100 μm can satisfy the mechanical properties as a belt substrate.

-Tensile modulus-
The Young's modulus (tensile modulus) was measured in accordance with JIS K6301 by measuring a dumbbell No. 3 punched specimen (width 5 mm).

-Layer structure and usage of belt tubular materials-
When the seamless tubular product produced using the present invention is used as a transfer body, conductive particles are dispersed in a polyimide material. Examples of the conductive particles include carbon black, carbon fiber, and graphite.

  When a belt tubular member is used as a fixing member, it is effective to form a non-adhesive resin layer on the belt surface in order to prevent fusion of toner adhering to the surface (outer peripheral surface). Examples of the material include fluorine resins such as polytetrafluoroethylene (PTFE) and tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA). The non-adhesive layer may contain materials such as carbon powder, inorganic compound powders such as titanium oxide and barium sulfate for the purpose of improving wear resistance, electrostatic offset, and compatibility with toner adhesion preventing oil. Good. A preferable polyimide resin layer for the fixing belt has a thickness of 25 to 200 μm, and a non-adhesive layer has a thickness of 5 to 50 μm.

(Surface resistivity)
The seamless tubular product made of polyimide resin of the present embodiment has a common logarithmic value of surface resistivity of 8 to 13 (log Ω / □) when a voltage of 100 V is applied under the condition of 22 ° C. and 55 RH%, preferably Is 9-12. If the surface resistivity is too low, the transferred image may be distorted due to the spread or lateral flow of the transfer current. On the other hand, if the surface resistivity is too high, a surface potential neutralization mechanism may be required to prevent contamination. .

  For the surface resistivity, a circular electrode shown in FIG. 4 (for example, HR probe of High Lester IP manufactured by Mitsubishi Yuka Co., Ltd.) is used, and a voltage of 100 V is applied unless otherwise specified according to JIS K6911 (1995). The value obtained from the current value after 10 seconds. FIG. 1 is a schematic plan view (a) and a schematic cross-sectional view (b) showing an example of a circular electrode. The circular electrode includes a first voltage application electrode A and a plate-like insulator B. The first voltage application electrode A has a columnar electrode portion C and a cylindrical ring electrode having an inner diameter larger than the outer diameter of the columnar electrode portion C and surrounding the columnar electrode portion C at regular intervals. Part D is provided. A test piece T is sandwiched between the cylindrical electrode part C and the ring-shaped electrode part D and the plate-like insulator B in the first voltage application electrode A, and the cylindrical electrode part C and the ring shape in the first voltage application electrode A. The current I (A) flowing when the voltage V (V) is applied between the electrode part D is measured, and the surface resistivity ρs (Ω / □) can be calculated by the following formula (1). Here, in the following 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.

    Formula (1) ρs = π × (D + d) / (D−d) × (V / I)

(Electric field dependence of surface resistivity)
Moreover, the seamless tubular product made of polyimide resin according to the present embodiment has a difference in common logarithm of surface resistivity of 0.3 (logΩ / logo) when voltages of 100 V and 1000 V are applied under the conditions of 22 ° C. and 55 RH%. □) The following.

  As mentioned above, although the manufacturing method of the seamless tubular product of the present invention has been described, the present invention is not limited only to these embodiments, and various modifications can be made based on the knowledge of those skilled in the art without departing from the spirit of the present invention. The present invention can be implemented in a mode with improvements, changes and modifications.

<Image forming apparatus>
The image forming apparatus according to the present embodiment includes the above-described seamless tubular object according to the present embodiment, and a plurality of support rolls around which the seamless tubular object is wound and which stretches and conveys the seamless tubular object. It is characterized by. Specifically, the sheet conveying belt type image forming apparatus using the seamless tubular material of the present embodiment described above and the intermediate transfer body type image forming apparatus using the seamless tubular material of the present embodiment are exemplified.

  A color image forming apparatus that repeats primary transfer will be described below as an example of the image forming apparatus of the present invention. FIG. 6 is a schematic configuration diagram showing an example of the image forming apparatus of the present invention.

  An image forming apparatus 100 shown in FIG. 6 includes a photosensitive drum 101 as an image carrier, an intermediate transfer belt 102 as an intermediate transfer member, a bias roller 103 as a transfer electrode, and a paper tray 104 for supplying paper as a transfer target. , K (black) toner developing device 105, Y (yellow) toner developing device 106, M (magenta) toner developing device 107, C (cyan) toner developing device 108, belt cleaner 109, peeling claw 113, support A roll 121, a support roll 123, a support roll 124, a backup roller 122, a conductive roller 125, an electrode roller 126, a cleaning blade 131, a paper 141, a pickup roller 142, and a feed roller 143 are configured. As the intermediate transfer belt 102, the seamless tubular product 10 of the present invention is used.

  The intermediate transfer belt 102 is stretched over a support roll 121, a support roll 123, a backup roller 122, and a support roll 124 as a plurality of support rolls, and is mounted on the image forming apparatus 100 in a stretched state.

  The intermediate transfer belt 102 is stretched and conveyed by a plurality of support rolls (a support roll 121, a support roll 123, a backup roller 122, and a support roll 124), thereby rotating in a predetermined direction (the arrow G direction in FIG. 6). Be transported.

  Here, when the intermediate transfer belt 102 is stretched across the support roll 121, the support roll 123, the backup roller 122, and the support roll 124 as a plurality of support rolls, The meandering prevention rib guide provided on the inner peripheral surface side of the intermediate transfer belt 102 includes a support roll 121, a support roll 123, a backup roller 122, and side edges of the support roll 124 or the support roll 121, the support roll 123, and the backup roller. 122 and the support roll 124 are positioned so as to abut on a groove (not shown) provided in the circumferential direction of the surface. For this reason, the intermediate transfer belt 102 is guided to the meandering prevention rib guide 14 during belt running. For this reason, the intermediate transfer belt 102 does not cause a problem of meandering during the stretch conveyance.

  In the image forming apparatus 100, the photosensitive drum 101 is rotated in a predetermined direction (the direction of arrow F in FIG. 6). When the photosensitive drum 101 is rotated, the surface of the photosensitive drum 101 is uniformly charged by a charging device (not shown). On the surface of the photosensitive drum 101 whose surface is uniformly charged, the photosensitive drum 101 is modulated in accordance with a first color (for example, BK) included in image data of an image formed by an exposure device (not shown) such as a laser writing device. Laser light is scanned and exposed to form an electrostatic latent image corresponding to black image data. The electrostatic latent image is visualized by the black toner supplied from the developing device 105 that performs development using the black toner, whereby a black toner image T is formed on the photosensitive drum 101. When the toner image T reaches a region (primary transfer portion) facing the conductive roller 125 by the rotation of the photosensitive drum 101, an electrostatic field is applied to the toner image T from the conductive roller 125 by electrostatic force. By being attracted to the intermediate transfer belt 102, the primary transfer is performed on the intermediate transfer belt 102.

  Similarly, a second color (for example, Y color) toner image, a third color (for example, M color) toner image, and a fourth color (for example, C color) toner image are sequentially formed in the same manner. Polymerization is performed at 102 to form a multiple toner image.

  The multiple toner images transferred to the intermediate transfer belt 102 reach a region (secondary transfer portion) facing the bias roller 103 by the tension transfer of the intermediate transfer belt 102. The secondary transfer unit includes a bias roller 103 disposed opposite to the outer peripheral surface of the intermediate transfer belt 102, a backup roller 122 disposed so as to sandwich and convey the intermediate transfer belt 102 between the bias roller 103, and this An electrode roller 126 that rotates in pressure contact with the backup roller 122 is included.

  The sheets 141 are picked up one by one from the sheet bundle accommodated in the sheet tray 104 by the pickup roller 142, and are fed to a region where the intermediate transfer belt 102 and the bias roller 103 of the secondary transfer unit are opposed by the feed roller 143 at a predetermined timing. Be fed. The toner image carried on the intermediate transfer belt 102 is transferred to the fed paper 141 by the pressure contact conveyance by the bias roller 103 and the backup roller 122 and the rotation of the intermediate transfer belt 102.

  The paper 141 onto which the toner image has been transferred is peeled off from the intermediate transfer belt 102 by operating the peeling claw 113 at the retracted position until the primary transfer of the final toner image is completed, conveyed to a fixing device (not shown), and pressurized / heated. The toner image is fixed by the processing to be a permanent image. The intermediate transfer belt 102 after the transfer of the multiple toner image to the paper 141 is completed for removal of residual toner by a belt cleaner 109 provided downstream of the secondary transfer unit to prepare for the next transfer. The bias roller 103 is attached so that a cleaning blade 131 made of polyurethane or the like is always in contact with it, and foreign particles such as toner particles and paper dust adhered by transfer are removed.

  In the case of transfer of a single color image, the primary transferred toner image T is immediately secondarily transferred and conveyed to the fixing device. In the case of transfer of a multicolor image by superimposing a plurality of colors, the toner image of each color is transferred to the primary transfer unit. Therefore, the rotation of the intermediate transfer belt 102 and the photosensitive drum 101 is synchronized so that the toner images of the respective colors do not shift so that they coincide with each other accurately. In the secondary transfer section, an output pressure (transfer voltage) having the same polarity as the polarity of the toner image is applied to the electrode roller 126 that is in pressure contact with the backup roller 122 disposed opposite to the bias roller 103 via the intermediate transfer belt 102. The toner image is transferred to the paper 141 by electrostatic repulsion. As described above, an image can be formed.

  Next, another example of the image forming apparatus of the present invention is shown. An image forming apparatus 200 shown in FIG. 7 includes an image forming unit 201Y for forming a Y color toner image, an image forming unit 201M for forming an M color toner image, and a C color toner image. Image forming unit 201 </ b> C, image forming unit 201 </ b> BK for forming a black (BK) toner image, paper transport belt 206 that transports paper on the surface, and transports the paper to each of the image forming units 201. A sheet conveying roll 208 and a fixing device 209 that fixes a toner image formed on the sheet to the sheet are configured. The image forming unit 201Y for forming the Y color toner image, the image forming unit 201M for forming the M color toner image, the image forming unit 201C for forming the C color toner image, and the black color The image forming unit 201BK for forming the (BK) toner image will be collectively referred to as the image forming unit 201. As the paper conveying belt 206, the seamless tubular material of the present invention is used.

  The sheet transport belt 206 is mounted on the image forming apparatus 200 in a stretched state, spanning the support roll 213, the support roll 212, the support roll 210, and the support roll 211 as a plurality of support rolls.

  The sheet conveying belt 206 is stretched and conveyed by the plurality of supporting rolls (the supporting roll 213, the supporting roll 212, the supporting roll 210, and the supporting roll 211), and thus in a predetermined direction (the arrow H direction in FIG. 7). It is rotated and conveyed.

  Here, when the paper transport belt 206 is stretched over the support roll 213, the support roll 212, the support roll 210, and the support roll 211 as a plurality of support rolls, The meandering prevention rib guide provided on the inner peripheral surface side of the sheet conveying belt 206 includes a support roll 213, a support roll 212, a support roll 210, and a side edge of the support roll 211 or a support roll 213, a support roll 212, and a support roll. 210 and the support roll 211 are positioned so as to abut on a groove (not shown) provided in the circumferential direction of the surface. For this reason, when the belt travels, the paper transport belt 206 is guided by the meandering prevention rib guide. For this reason, the paper conveyance belt 206 does not cause a problem of meandering during stretch conveyance.

  For example, a metal roll having an outer diameter of 12 to 18 mm can be used as the plurality of support rolls.

  Each of the image forming unit 201Y, the image forming unit 201M, the image forming unit 201C, and the image forming unit 201BK includes a photosensitive drum 221Y that rotates at a predetermined peripheral speed in a predetermined direction (the direction of arrow I in FIG. 7), and a photosensitive member. Each of the drum 221M, the photosensitive drum 221C, and the photosensitive drum 221BK is provided.

  In the vicinity of each of the photosensitive drum 221Y, the photosensitive drum 221M, the photosensitive drum 221C, and the photosensitive drum 221BK, a charging device (charging) for charging the photosensitive drum along the rotation direction of each photosensitive drum. 202Y, charging device 202M, charging device 202C, and charging device 202BK), and exposure units (exposure unit 203Y, exposure unit 203M, and exposure unit 203C) for forming an electrostatic latent image corresponding to image data on the photosensitive drum. , And exposure device 203BK), developing devices for developing the electrostatic latent image formed on the photosensitive drum with toner (yellow developing device 204Y, magenta developing device 204M, cyan developing device 204C, black developing device 204BK), photosensitive member Cleaning blade (cleaning blade 2) for removing deposits such as residual toner on the top 5Y, the cleaning blade 205M, the cleaning blade 205C, and the cleaning blade 205BK), and a transfer roll for transferring the toner image on the photosensitive drum to the paper 216 conveyed between the paper conveying belt 206 and the photosensitive drum ( A transfer roll 207Y, a transfer roll 207M, a transfer roll 207C, and a transfer roll 207BK) are sequentially provided.

  The transfer roll 207Y, the transfer roll 207M, the transfer roll 207C, and the transfer roll 207BK are provided on the inner peripheral side of the paper conveyance belt 206, and the photosensitive drum 221Y, the photosensitive drum 221M, the photosensitive drum 221C, and the photosensitive drum. The sheet conveying belt 206 is sandwiched between each of the 221BKs.

  The image forming unit 201BK, the image forming unit 201C, the image forming unit 201M, and the image forming unit 201Y are each along the paper transport belt 206 from the upstream side to the downstream side in the transport direction of the paper transport belt 206. Although they are arranged in order in parallel, the order is not limited to this, and an appropriate order can be set according to the image forming method.

  The fixing device 209 fixes each of the image forming unit 201Y, the image forming unit 201M, the image forming unit 201C, and the image forming unit 201BK to a sheet on which each color toner image is transferred by these image forming units. The sheet is discharged outside the image forming apparatus 200.

  In the image forming apparatus 200, first, the surface of the photosensitive drum 221BK of the image forming unit 201BK is uniformly charged by the charging device 202BK, and then the light beam modulated according to the image data is scanned and exposed by the exposure device 203BK. As a result, an electrostatic latent image is formed. This electrostatic latent image is developed by the black developing device 204BK to form a toner image of BK toner. The toner may be one-component or two-component.

  The black toner image formed on the photoconductive drum 221BK passes through a region where the photoconductive drum 221BK and the paper transport belt 206 are opposed to each other, and at the same time, the paper 216 is electrostatically attracted to the paper transport belt 206. The sheet is conveyed to the opposite area and transferred onto the outer peripheral surface of the sheet 216 by an electric field formed by a transfer bias applied from the transfer roll 207BK.

  Next, in the image forming unit 201C, the image forming unit 201M, and the image forming unit 201Y, the same processing as that of the image forming unit 201BK is performed, so that the C, M, and Y color toners are sequentially applied to the paper 216. Images are transferred in sequence.

  The sheet 216 to which the BK, C, M, and Y toner images are transferred is conveyed to the installation position of the fixing device 209 by the conveyance of the sheet conveying belt 206, so that the toner image is transferred by the fixing device 209. After fixing, the image forming apparatus 200 is discharged to the outside.

  In the example of the image forming apparatus described above, the case where the seamless tubular object is wound around a plurality of support rolls and stretched is explained. However, according to the seamless tubular object of the present invention, as shown in FIG. As a pair of support rolls, the support roll 300 and the support roll 302 may be wound around and stretched.

  Hereinafter, the present invention will be specifically described by way of examples. However, each example does not limit the present invention.

  First, a polyimide precursor solution and seamless tubular molding will be described for reference.

<Polyimide precursor solution A>
N-methyl-2-pyrrolidone (NMP) solution of polyamic acid consisting of 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride (BPDA) and oxydianiline (ODA) (Ube Industries R made by Ube Industries) 5 parts by weight of dry oxidized carbon black (SPEDIAL BLACK4 (manufactured by Degussa)) was added to 100 parts by weight of the polyimide resin solids of FIG. (GianusPY), the pressure is 200 MPa, the minimum area is 1.4 mm ² , and the collision is performed after dividing into two parts, and the mixture is mixed again by passing through a path that is divided into two parts again and mixed five times. Obtained.

<Polyimide precursor solution B>
N-methyl-2pyrrolidone (NMP) solution of polyamic acid composed of 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride (BPDA) and p-phenylenediamine (PPD) (Uwanisu S manufactured by Ube Industries) ) Polyimide resin solid content of 100 parts by weight of the dry oxidized carbon black (SPEDIAL BLACK4 (manufactured by Degussa)) is added so as to become 23 parts by weight. The carbon black-dispersed polyamic acid solution B having a viscosity of 150 poise is mixed by passing through a path that is divided into two parts again after being divided into two parts with a pressure of 200 MPa and a minimum area of 1.4 mm ² at a pressure of 200 MPa. Obtained.

<Polyamideimide resin solution C>
The impact shown in FIG. 5 is added to a polyamideimide resin solution (Toyobo Viromax 16NN) with a solid content of 100 parts by weight so as to be 23 parts by weight of dry oxidized carbon black (SPEDIAL BLACK4 (manufactured by Degussa)). Carbon black with a viscosity of 150 poise using a type disperser (Genus PY made by Genus), colliding after splitting into two parts with a pressure of 200 MPa and a minimum area of 1.4 mm ² , and again passing through the two split paths five times. A dispersed polyamideimide acid solution C was obtained.

<Seamless tubular molding>
While the polyimide precursor solutions A and B and the polyamideimide precursor solution C are rotated at 100 rpm, the molding core is rotated at 100 rpm, the starting point is 55 mm from the end of the molding core, and the dispenser and scraper are moved to the outer peripheral surface of the core. While moving at 150 min / min, applying at a thickness of 0.5 mm, rotating at 5 rpm, heating at 120 ° C. for 30 minutes, cooling to room temperature, and then heating to 300 ° C. for 2 hours to remove the solvent and imide After the conversion, and finally cooling to room temperature, the polyimide seamless tubular material was separated from the core.

[Example 1]
<Core>
Using a cylindrical aluminum base material having an outer diameter of 190 mm, a length of 500 mm, and a thickness of 5 mm, n-heptane 16 with respect to 4 parts by mass of a silicone resin composition (Shin-Etsu Chemical Co., SepaCoat) on the outer surface of the core body A solution diluted with parts by mass was applied by spraying and baked at 150 ° C. for 60 minutes to form a release layer. The seamless tubular product forming region of the forming core on which the release layer is formed is covered with a film having holes of φ6 mm at a pitch of 20 mm, and irradiated with ultraviolet rays at an illuminance of 13 mW / cm ² , an irradiation time of 24 min, and a core rotation speed of 5 rpm. I let you. The water contact angle of the UV-irradiated part was 40 °. The water contact angle was 3.1 μl of the droplet, the maximum value measured within 15 seconds after the droplet, and the average value of four divisions in the circumferential direction of the core.

Further, the low water contact angle area per one in the release layer of the molding core is 0.28 cm ² , and the total area of the low water contact angle region with a water contact angle of 40 ° is 6 with respect to the total area of the release layer. A molding core of .9% was obtained. Moreover, the low water contact angle area | region of the water contact angle of 40 degrees in the area of 10 cm x 10 cm square of a mold release layer was measured about arbitrary 6 places (3 places of an axial direction, 2 places of circumferential directions) of the core for shaping | molding. However, it was 6.9% in any part.

  Using the above-described molding core, the above-described seamless tubular product was molded using the polyimide precursor solution A, and the seamless tubular product was molded. There was no dirt. When the film thickness was measured, the difference between the maximum value and the minimum value in the axial direction was 3 μm. When used as a transfer belt of an image forming apparatus, image defects such as image displacement and density unevenness did not occur.

[Example 2]
<Core>
The release layer of the molding core was operated in the same manner as in Example 1 except that the seamless tubular product molding region in the molding core on which the release layer was formed was covered with a film in which holes of φ3 mm were formed at a pitch of 10 mm. A molding core having a low water contact angle area of 0.07 cm ² and a total area of a low water contact angle region with a water contact angle of 40 ° is 7.0% of the total area of the release layer. I was able to get it. Moreover, when the low water contact angle area | region of the water contact angle of 40 degrees in the area of 10 cm x 10 cm square of a mold release layer was measured about arbitrary 6 places of a shaping | molding core, all places are 7.0%. there were.

  When the above-described seamless tubular product was molded using the polyimide precursor solution A using the above-described molding core, and the seamless tubular product was molded, the core after separation of the molded product did not swell and contract. There was no. When the film thickness was measured, the difference between the maximum value and the minimum value in the axial direction was 3 μm. Further, when used as a transfer belt of an image forming apparatus, image defects such as image displacement and density unevenness did not occur.

[Example 3]
<Core>
The release layer of the molding core was operated in the same manner as in Example 1 except that the seamless tubular product molding region in the molding core on which the release layer was formed was covered with a film having φ18 mm holes formed at a pitch of 60 mm. A molding core having a low water contact angle area of 2.80 cm ² and a total area of a low water contact angle area of 40 ° water contact is 6.9% of the total area of the release layer. I was able to get it. Moreover, when the low water contact angle area | region of the water contact angle of 40 degrees in the area of 10 cm x 10 cm square of a mold release layer was measured about arbitrary 6 places of a shaping | molding core, all places were 6.9%. there were.

  Using the above-described molding core, the above-described seamless tubular product was molded using the polyimide precursor solution A, and the seamless tubular product was molded. There was no. When the film thickness was measured, the difference between the maximum value and the minimum value in the axial direction was 3 μm. Further, when used as a transfer belt of an image forming apparatus, image defects such as image displacement and density unevenness did not occur.

[Example 4]
<Core>
The release layer of the molding core was operated in the same manner as in Example 1 except that the seamless tubular product molding region in the molding core on which the release layer was formed was covered with a film having φ6 mm holes formed at a pitch of 30 mm. A molding core having a low water contact angle area of 0.28 cm ² and a total water area of a low water contact angle of 40 ° is 3.0% of the total area of the release layer. I was able to get it. Moreover, when the low water contact angle area | region of the water contact angle of 40 degrees in the area of 10 cm x 10 cm square of a mold release layer was measured about arbitrary six places of a shaping | molding core, all places are 3.0%. there were.

  Using the above-described molding core, the above-described seamless tubular product was molded using the polyimide precursor solution A, and the seamless tubular product was molded. There was no. When the film thickness was measured, the difference between the maximum value and the minimum value in the axial direction was 5 μm. Further, when used as a transfer belt of an image forming apparatus, image defects such as image displacement and density unevenness did not occur.

[Example 5]
<Core>
The release layer of the molding core was operated in the same manner as in Example 1 except that the seamless tubular product molding region in the molding core on which the release layer was formed was covered with a film in which holes of φ6 mm were formed at a pitch of 10 mm. A molding core body having a low water contact angle area of 0.28 cm ² and a total water area of a low water contact angle of 40 ° is 28.1% of the total area of the release layer. I was able to get it. Moreover, when the low water contact angle area | region of the water contact angle of 40 degrees in the area of 10 cm x 10 cm square of a mold release layer was measured about arbitrary 6 places of a shaping | molding core, all places were 28.1%. there were.

  Using the above-described molding core, the above-described seamless tubular product was molded using the polyimide precursor solution A, and the seamless tubular product was molded. There was no. When the film thickness was measured, the difference between the maximum value and the minimum value in the axial direction was 2 μm. Further, when used as a transfer belt of an image forming apparatus, image defects such as image displacement and density unevenness did not occur.

[Example 6]
<Core>
The same operation as in Example 1 was carried out except that the ultraviolet irradiation time was set to 26 min, and the low water contact angle area per one in the release layer of the molding core was 0.28 cm ² , and the low water contact angle was 30 °. A molding core having a total contact angle region area of 6.9% with respect to the total area of the release layer could be obtained. Moreover, when the low water contact angle area | region of the water contact angle of 30 degrees in the area of 10 cm x 10 cm square of a mold release layer was measured about arbitrary 6 places of a shaping | molding core, all places were 6.9%. there were.

  Using the above-described molding core, the above-described seamless tubular product was molded using the polyimide precursor solution A, and the seamless tubular product was molded. There was no. When the film thickness was measured, the difference between the maximum value and the minimum value in the axial direction was 2 μm. Further, when used as a transfer belt of an image forming apparatus, image defects such as image displacement and density unevenness did not occur.

[Example 7]
<Core>
The same operation as in Example 1 was carried out except that the ultraviolet irradiation time was set to 22 min, and the low water contact angle area per one in the release layer of the molding core was 0.28 cm ² and the low water contact angle was 50 °. A molding core having a total contact angle region area of 6.9% with respect to the total area of the release layer could be obtained. Moreover, when the low water contact angle area | region of the water contact angle of 50 degrees in the area of 10 cm x 10 cm square of a mold release layer was measured about arbitrary 6 places of a shaping | molding core, all places were 6.9%. there were.

  Using the above-described molding core, the above-described seamless tubular product was molded using the polyimide precursor solution A, and the seamless tubular product was molded. There was no. When the film thickness was measured, the difference between the maximum value and the minimum value in the axial direction was 5 μm. Further, when used as a transfer belt of an image forming apparatus, image defects such as image displacement and density unevenness did not occur.

[Example 8]
<Core>
One of the mold release layers of the molding core is formed by covering a seamless tubular product molding region of the molding core with the mold release layer with a film having φ6 mm holes formed at a pitch of 10 mm, with an ultraviolet irradiation time of 26 min. It is possible to obtain a molding core having a low water contact angle area of 0.28 cm ² and a total area of a low water contact angle region of 30 ° water contact angle of 28.1% with respect to the total area of the release layer. did it. Moreover, when the low water contact angle area | region of the water contact angle of 30 degrees in the area of 10 cm x 10 cm square of a mold release layer was measured about arbitrary six places of a shaping | molding core, all places were 28.1%. there were.

  When the above-described seamless tubular product was molded using the polyimide precursor solution B using the above-described molding core, and the seamless tubular product was molded, the core after separation of the molded product was soiled without swelling or shrinkage. There was no. When the film thickness was measured, the difference between the maximum value and the minimum value in the axial direction was 6 μm. Further, when used as a transfer belt of an image forming apparatus, image defects such as image displacement and density unevenness did not occur.

[Example 9]
<Core>
One of the mold release layers of the molding core is formed by coating a seamless tubular product molding area in the molding core on which the mold release layer is formed with a film having holes of φ6 mm at a pitch of 20 mm and an ultraviolet irradiation time of 22 min. It is possible to obtain a molding core having a low water contact angle area of 0.28 cm ² and a total area of a low water contact angle region of 50 ° water contact angle of 6.9% with respect to the total area of the release layer. did it. Moreover, when the low water contact angle area | region of the water contact angle of 50 degrees in the area of 10 cm x 10 cm square of a mold release layer was measured about arbitrary 6 places of a shaping | molding core, all places were 6.9%. there were.

  When the above-described seamless tubular product was molded using the polyamideimide solution C using the molding core, and the seamless tubular product was molded, there was no swelling and shrinkage, and the core after separation of the molded product was not soiled. It was. When the film thickness was measured, the difference between the maximum value and the minimum value in the axial direction was 3 μm. Further, when used as a transfer belt of an image forming apparatus, image defects such as image displacement and density unevenness did not occur.

[Example 10]
<Core>
The same operation as in Example 1 was carried out except that a seamless tubular product molding region in the molding core formed with the release layer was covered with a film in which holes with a diameter of 6 mm were randomly formed so as to have an average pitch of 10 mm, The low water contact angle area per one in the release layer of the molding core is 0.28 cm ² , and the total area of the low water contact angle region with a water contact angle of 40 ° is 6.9 with respect to the total area of the release layer. %, A molding core was obtained. Moreover, when the low water contact angle area | region of the water contact angle of 40 degrees in the area of 10 cm x 10 cm square of a mold release layer was measured about arbitrary 6 places of a shaping | molding core, it was 4 to 10% .

  Using the above-described molding core, the above-described seamless tubular product was molded using the polyimide precursor solution A, and the seamless tubular product was molded. There was no. When the film thickness was measured, the difference between the maximum value and the minimum value in the axial direction was 2 μm. Further, when used as a transfer belt of an image forming apparatus, image defects such as image displacement and density unevenness did not occur.

[Example 11]
<Core>
The same operation as in Example 1 was carried out except that a seamless tubular product molding region in the molding core formed with the release layer was covered with a film in which holes with a diameter of 6 mm were randomly formed so as to have an average pitch of 10 mm, The low water contact angle area per one in the release layer of the molding core is 0.28 cm ² , and the total area of the low water contact angle region with a water contact angle of 40 ° is 3.0 relative to the total area of the release layer. %, A molding core was obtained. Moreover, when the low water contact angle area | region of the water contact angle of 40 degrees in the area of 10 cm x 10 cm square of a mold release layer was measured about arbitrary 6 places of a shaping | molding core, it is 1.5% or more and 5% or less. there were.

  When the above-described seamless tubular product was molded using the polyimide precursor solution A using the molding core, and the seamless tubular product was molded, there was no shrinkage, but there was no shrinkage, and the molded product There was no stain on the core after separation. When the film thickness was measured, the difference between the maximum value and the minimum value in the axial direction was 4 μm. Further, when used as a transfer belt of an image forming apparatus, image defects such as image displacement and density unevenness did not occur.

[Example 12]
<Core>
The same operation as in Example 5 was carried out except that a seamless tubular product molding region in the molding core formed with the release layer was coated with a film in which holes with a diameter of 6 mm were randomly formed so as to have an average pitch of 10 mm, The low water contact angle area per one in the release layer of the molding core is 0.28 cm ² , and the total area of the low water contact angle region with a water contact angle of 40 ° is 28.1 with respect to the total area of the release layer. %, A molding core was obtained. Moreover, when the low water contact angle area | region of the water contact angle of 40 degrees in the area of 10 cm x 10 cm square of a mold release layer was measured about arbitrary 6 places of a shaping | molding core, it was 25 to 31% .

  Using the polyimide core solution A, the above-described polyimide precursor solution A is used to perform the above-mentioned seamless tubular product molding, and the seamless tubular product is molded. However, it was demoldable, did not swell and contract, and the core after separation of the molded body was not soiled. When the film thickness was measured, the difference between the maximum value and the minimum value in the axial direction was 3 μm. Further, when used as a transfer belt of an image forming apparatus, image defects such as image displacement and density unevenness did not occur.

[Comparative Example 1]
<Core>
Except for non-irradiation with ultraviolet rays, the same operation as in Example 1 was performed, and the water contact angle of the entire core surface at this time was 100 °.

  When the seamless tubular product is molded using the polyimide precursor solution A by using the polyimide precursor solution A, and the seamless tubular product is molded, blisters frequently occur and streaks due to shrinkage occur. It could not be used as a transfer belt for a molding apparatus.

[Comparative Example 2]
<Core>
The same operation as in Example 1 was performed except that the seamless tubular product forming region in the forming core on which the release layer was formed was coated with a film having a 7 mm pitch hole of φ2 mm, and the release layer of the forming core was A molding core having a low water contact angle area of 0.03 cm ² per unit and a total area of low water contact angle regions with a water contact angle of 40 ° is 6.3% with respect to the total area of the release layer. I was able to. Moreover, when the low water contact angle area | region of the water contact angle of 40 degrees in the area of 10 cm x 10 cm square of a mold release layer was measured about arbitrary 6 places of a shaping | molding core, all places were 6.3%. there were.

  Using the molding core, the above-described seamless tubular product was molded using the polyimide precursor solution A, and when the seamless tubular product was molded, several blisters occurred and streaks due to shrinkage occurred. , And could not be used as a transfer belt for an image forming apparatus.

[Comparative Example 3]
<Core>
The release layer of the molding core was operated in the same manner as in Example 1 except that the seamless tubular product molding region in the molding core on which the release layer was formed was coated with a film having holes of φ24 mm formed at an 80 mm pitch. A molding core having a low water contact angle area of 4.52 cm ² and a total water area of a low water contact angle of 40 ° is 5.5% of the total area of the release layer. I was able to get it. Moreover, when the low water contact angle area | region of the water contact angle of 40 degrees in the area of 10 cm x 10 cm square of a mold release layer was measured about arbitrary 6 places of a shaping | molding core, all places were 5.5%. there were.

  Using the above-described molding core, the above-described seamless tubular product was molded using the polyimide precursor solution A and the seamless tubular product was molded. Several blisters occurred in a region other than the water contact angle region, and could not be used as a transfer belt for an image forming apparatus.

[Comparative Example 4]
<Core>
The release layer of the molding core was operated in the same manner as in Example 1 except that the seamless tubular product molding region in the molding core on which the release layer was formed was covered with a film having 6 mm holes formed at a pitch of 8 mm. A molding core having a low water contact angle area of 0.28 cm ² and a total water area of a low water contact angle of 40 ° is 42.9% of the total area of the release layer. I was able to get it. Moreover, when the low water contact angle area | region of the water contact angle of 40 degrees in the area of 10 cm x 10 cm square of a mold release layer was measured about arbitrary six places of a shaping | molding core, all the places were 42.9%. there were.

  Using the polyimide core solution A, the above-described polyimide precursor solution A was used to perform the above-described seamless tubular product molding, and when the seamless tubular product was molded, the molding core and the seamless tubular product molded article had strong adhesion. Separation from the core was not possible, and a seamless tubular product could not be obtained.

[Comparative Example 5]
<Core>
The release layer of the molding core was operated in the same manner as in Example 1 except that the seamless tubular product molding region in the molding core on which the release layer was formed was covered with a film having holes of 6 mm in diameter at a pitch of 40 mm. A molding core having a low water contact angle area of 0.03 cm ² and a total water area of a low water contact angle of 40 ° is 1.6% of the total area of the release layer. I was able to get it. Moreover, when the low water contact angle area | region of the water contact angle of 40 degrees in the area of 10 cm x 10 cm square of a mold release layer was measured about arbitrary 6 places of a shaping | molding core, all places are 1.6%. there were.

  When the above-described seamless tubular product is molded using the polyimide precursor solution A by using the molding core, and the seamless tubular product is molded, several blisters are generated and used as a transfer belt of an image molding apparatus. I couldn't.

[Comparative Example 6]
<Core>
The same operation as in Example 1 was carried out except that the ultraviolet irradiation time was changed to 30 min, and the low water contact angle area per one in the mold release layer of the molding core was 0.28 cm ² and the low water contact angle was 20 °. A molding core having a total contact angle region area of 6.9% with respect to the total area of the release layer could be obtained. Moreover, when the low water contact angle area | region of the water contact angle of 20 degrees in the area of 10 cm x 10 cm square of a mold release layer was measured about arbitrary 6 places of a shaping | molding core, all places were 6.9%. there were.

  Using the polyimide core solution A, the above-described polyimide precursor solution A was used to perform the above-described seamless tubular product molding, and when the seamless tubular product was molded, the molding core and the seamless tubular product molded article had strong adhesion. Separation from the core was not possible, and a seamless tubular product could not be obtained.

[Comparative Example 7]
<Core>
The same operation as in Example 1 was carried out except that the ultraviolet irradiation time was 19 min. The low water contact angle area per one in the release layer of the molding core was 0.28 cm ² , and the low water contact angle was 60 °. A molding core having a total contact angle region area of 6.9% with respect to the total area of the release layer could be obtained. Moreover, when the low water contact angle area | region of the water contact angle of 60 degrees in the area of 10 cm x 10 cm square of a mold release layer was measured about arbitrary 6 places of a shaping | molding core, all places were 6.9%. there were.

  When the above-described seamless tubular product is molded using the polyimide precursor solution A by using the molding core, and the seamless tubular product is molded, several blisters are generated and used as a transfer belt of an image molding apparatus. I couldn't.

[Evaluation]
(Blowing and shrinking streaks of seamless tubular objects)
The swelling and shrinkage streaks of the obtained seamless tubular product were determined visually.

(Demoldability)
The detachability of the seamless tubular material from the cylindrical core was determined according to the following criteria.
○: Demolded easily by air insertion.
(Triangle | delta): Although the seamless tubular thing stuck to the cylindrical core at the time of mold removal, mold removal was possible.
X: The seamless tubular product sticks to the cylindrical core during demolding, and the demolded seamless tubular product cannot be used.

(Evaluation of transfer image quality)
Using the Fuji Xerox Co., Ltd. Docu Color a450 shown in FIG. 6, the transfer image quality was evaluated while changing the obtained semiconductive belt. As the paper, a product name “Rezac 66 (151 g / m ² )” manufactured by Fuji Xerox Office Supply Co., Ltd. was used. The paper size was A3. The output was 200 cycles per cycle up to 5 cycles up to 1000, and image defects such as white spots were visually observed.
○: No image defect.
X: There is an image defect.
-: Unusable as a transfer belt.

(Dirt on the molding core after separation)
The seamless tubular product molded body was visually observed for stains on the molding core after demolding and separation from the molding core.
○: No dirt on the molding core after separation.
Δ: The molded core after separation is partially soiled but can be easily removed by wiping with alcohol.
X: The molding core after separation is soiled and cannot be removed by wiping the molding core with alcohol.

(Seamless tubular film thickness)
An aluminum plate was installed on the inner surface of the obtained seamless tubular product as a base, and the film thickness was measured using an eddy current meter Isoscope MP30 (manufactured by Fisher Instruments Co., Ltd.). The measurement points were 10 mm pitch per axial direction, and the maximum and minimum widths per axial direction were calculated.

  As an application example of the present invention, it can be applied to belt applications that require heat resistance, high strength and conductivity, for example, an antistatic member, an electromagnetic wave shielding member, and copying using an electrophotographic system There are also applications to belts used in image forming apparatuses such as printers and printers.

It is a schematic perspective view which shows the structure of an example of the core for shaping | molding in this Embodiment. It is a figure explaining an example of shaping | molding of a seamless tubular product molded object using the core for shaping | molding of this Embodiment. It is a schematic diagram explaining the area | region where the surface energy of the surface of the core for shaping | molding of this Embodiment differs. It is the schematic plan view (a) and schematic sectional drawing (b) which show an example of the circular electrode which measures a surface resistivity and volume resistivity. It is a figure explaining the structure of an example of a collision type dispersion machine. 1 is a schematic configuration diagram of an image forming apparatus provided with a seamless tubular article as an intermediate transfer belt in the present embodiment. 1 is a schematic configuration diagram of an image forming apparatus provided with a seamless tubular article of the present embodiment as a paper conveying belt. It is a schematic block diagram which shows the tension state different from FIG. 7 of a seamless tubular thing.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Molding core, 11 Base material, 12 Low water contact angle area | region, 14 Release layer, 16 Seamless tubular product molded body formation area, 18a Pitch width, 100 Image forming apparatus, 101 Photosensitive drum, 102 Intermediate transfer belt, 103 bias roller, 104 paper tray, 105 developing device, 106 developing device, 107 developing device, 108 developing device, 109 belt cleaner, 113 peeling claw, 121 supporting roll, 122 backup roller, 123 supporting roll, 124 supporting roll, 125 conductive Property roller, 126 electrode roller, 131 cleaning blade, 141 paper, 142 pickup roller, 143 feed roller.

Claims (9)

A base material, and a release layer formed on the surface of the base material,
Wherein the release layer, regions where water contact angle is 30 ° to 50 ° is provided with a plurality, area per the region one is at 0.05 cm ² or more 3.0 cm ² or less, the area The total core area is 3% or more and 30% or less of the total area of the release layer.   2. The molding core according to claim 1, wherein the region exists in an area of 10 cm × 10 cm square of the release layer at 3% or more and 30% or less.   The molding core according to claim 1, wherein the release layer contains a silicone resin.   2. The molding core according to claim 1, wherein the regions are scattered in the release layer, and a pitch width of adjacent regions is 10 mm or more and 60 mm or less. A substrate and a release layer formed on the surface of the substrate, wherein the release layer is provided with a plurality of regions having a water contact angle of 30 ° or more and 50 ° or less. area is at 0.05 cm ² or more 3.0 cm ² or less, and applying a solution total area of the region contains a resin on the surface of 3% or more to 30% or less is the core of the area of the release layer The manufacturing method of the seamless tubular thing characterized by having the application | coating process to do. A substrate and a release layer formed on the surface of the substrate, wherein the release layer is provided with a plurality of regions having a water contact angle of 30 ° or more and 50 ° or less. area is at 0.05 cm ² or more 3.0 cm ² or less, and applying a solution total area of the region contains a resin on the surface of 3% or more to 30% or less is the core of the area of the release layer A seamless tubular product characterized in that it is molded.   The seamless tubular article according to claim 6, wherein the resin in the resin-containing solution is a polyimide resin.   The seamless tubular article according to claim 6 or 7, wherein the difference between the maximum value and the minimum value of the film thickness in the axial direction is 7 µm or less. An image carrier, a charging unit that charges the surface of the image carrier, a latent image forming unit that forms a latent image on the surface of the image carrier, and a developing unit that develops the latent image with toner to form a toner image. Transfer means for transferring the toner image to a recording medium; and fixing means for fixing the toner image to the recording medium;
An image forming apparatus comprising the seamless tubular member according to claim 7 or 8 in the transfer unit or the fixing unit.

Images