JP2002160239A - Method for forming film, jointless belt, and manufacturing method for jointless belt - Google Patents
Method for forming film, jointless belt, and manufacturing method for jointless beltInfo
- Publication number
- JP2002160239A JP2002160239A JP2000360969A JP2000360969A JP2002160239A JP 2002160239 A JP2002160239 A JP 2002160239A JP 2000360969 A JP2000360969 A JP 2000360969A JP 2000360969 A JP2000360969 A JP 2000360969A JP 2002160239 A JP2002160239 A JP 2002160239A
- Authority
- JP
- Japan
- Prior art keywords
- film
- core
- coating
- polyimide precursor
- resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims description 48
- 238000000576 coating method Methods 0.000 claims abstract description 145
- 239000011248 coating agent Substances 0.000 claims abstract description 135
- 239000011347 resin Substances 0.000 claims abstract description 63
- 229920005989 resin Polymers 0.000 claims abstract description 63
- 239000000758 substrate Substances 0.000 claims abstract description 46
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 229920001721 polyimide Polymers 0.000 claims description 157
- 239000004642 Polyimide Substances 0.000 claims description 124
- 239000002243 precursor Substances 0.000 claims description 98
- 239000010408 film Substances 0.000 description 144
- 239000002904 solvent Substances 0.000 description 42
- 239000009719 polyimide resin Substances 0.000 description 31
- 229910052782 aluminium Inorganic materials 0.000 description 28
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 28
- 230000003746 surface roughness Effects 0.000 description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 22
- 238000001035 drying Methods 0.000 description 21
- 239000002798 polar solvent Substances 0.000 description 19
- 238000005488 sandblasting Methods 0.000 description 19
- 238000003618 dip coating Methods 0.000 description 14
- 239000000463 material Substances 0.000 description 10
- 230000008961 swelling Effects 0.000 description 10
- 239000004962 Polyamide-imide Substances 0.000 description 7
- 238000000151 deposition Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000007654 immersion Methods 0.000 description 7
- 229920002312 polyamide-imide Polymers 0.000 description 7
- 238000012546 transfer Methods 0.000 description 7
- 238000001723 curing Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 238000007598 dipping method Methods 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 238000010304 firing Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 238000007788 roughening Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 239000004809 Teflon Substances 0.000 description 3
- 229920006362 Teflon® Polymers 0.000 description 3
- 239000006229 carbon black Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000013007 heat curing Methods 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 229920001296 polysiloxane Polymers 0.000 description 3
- 239000013557 residual solvent Substances 0.000 description 3
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 2
- DLFVBJFMPXGRIB-UHFFFAOYSA-N Acetamide Chemical compound CC(N)=O DLFVBJFMPXGRIB-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000004693 Polybenzimidazole Substances 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- -1 etc.) Natural products 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920002480 polybenzimidazole Polymers 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 101100325793 Arabidopsis thaliana BCA2 gene Proteins 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 101100257194 Homo sapiens SMIM8 gene Proteins 0.000 description 1
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 239000004697 Polyetherimide Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 102100024789 Small integral membrane protein 8 Human genes 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910000410 antimony oxide Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 150000003949 imides Chemical class 0.000 description 1
- 229910003437 indium oxide Inorganic materials 0.000 description 1
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920001601 polyetherimide Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Fixing For Electrophotography (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、被膜形成方法、並
びに、例えば、電子写真複写機やレーザープリンタ等の
画像形成装置において、感光体、帯電ベルト、転写ベル
ト、及び定着ベルトなどに好適に使用される継ぎ目なし
ベルト及び継ぎ目なしベルトの製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a coating film and an image forming apparatus such as an electrophotographic copying machine or a laser printer, which is suitably used for a photoreceptor, a charging belt, a transfer belt and a fixing belt. The present invention relates to a seamless belt and a method for manufacturing the seamless belt.
【０００２】[0002]
【従来の技術】一般に樹脂溶液を塗布して得る被膜は、
樹脂材料等を有機溶剤に溶解或いは分散し、基体上に塗
布して塗膜を形成し、該塗膜を乾燥或いは加熱して形成
される。このような被膜形成方法を利用して得られるも
のの一つとしては継ぎ目なしベルトが挙げられる。一般
的に、継ぎ目なしベルトは、芯体の表面に樹脂溶液を均
一に塗布して塗膜を形成し、該塗膜を芯体上に保持した
まま加熱して樹脂を成膜した後、芯体から分離すること
で、得られる。2. Description of the Related Art In general, a coating obtained by applying a resin solution is as follows.
A resin material or the like is dissolved or dispersed in an organic solvent, applied on a substrate to form a coating film, and the coating film is formed by drying or heating. One of those obtained by using such a film forming method is a seamless belt. In general, a seamless belt is formed by coating a resin solution uniformly on the surface of a core to form a coating film, and heating the coating film while holding the coating film on the core to form a resin film. Obtained by separating from the body.
【０００３】継ぎ目なしベルトは、電子写真機器等の分
野、様々な分野で利用されている。一例を挙げると、従
来、電子写真機器では、トナー像を用紙上に加熱定着す
るための定着体などに、金属や各種プラスチック、また
はゴム製の回転体が使用されていたが、小型化或いは高
性能化のために、定着体等の回転体は変形可能なものが
好ましい場合があり、その回転体には肉厚が薄いプラス
チック製のフィルムからなるベルトが用いられる。この
場合、ベルトに継ぎ目（シーム）があると、出力画像に
継ぎ目に起因する欠陥が生じるので、継ぎ目はない方が
好ましく、継ぎ目なしベルトが用いられる。この継ぎ目
なしベルトを形成する樹脂材料としては、ポリイミド、
ポリアミドイミド、ポリベンズイミダゾール、ポリエー
テルエーテルケトン、ポリフェニレンスルフィド、ポリ
エーテルイミド等が挙げられる。これらの中では、強
度、耐熱性、寸法安定性等の観点からポリイミドが特に
好ましい。[0003] Seamless belts are used in various fields such as electrophotographic equipment. For example, conventionally, in an electrophotographic apparatus, a rotating body made of metal, various plastics, or rubber has been used as a fixing body for heat-fixing a toner image on paper. In order to improve performance, a rotating body such as a fixing body may be preferably deformable, and a belt made of a thin plastic film is used as the rotating body. In this case, if the belt has a seam, a defect caused by the seam occurs in the output image. Therefore, it is preferable that the belt has no seam, and a seamless belt is used. As a resin material for forming the seamless belt, polyimide,
Polyamide imide, polybenzimidazole, polyether ether ketone, polyphenylene sulfide, polyether imide and the like can be mentioned. Among them, polyimide is particularly preferable from the viewpoint of strength, heat resistance, dimensional stability and the like.
【０００４】ポリイミド樹脂製の継ぎ目なしベルトを作
製するには、例えば、特開平１０−１００１７１号公報
や特開平１０−２９６７６１号公報に開示されているよ
うに、円筒体の内面にポリイミド前駆体溶液を展開し、
回転しながら乾燥させる遠心成形法、特開平１−１３９
２２８号公報に開示されている内面塗布法がある。しか
しながら、最終的に熱硬化させるために、被膜を円筒体
の内面から加熱用の芯体に載せ換える工程が必要であ
り、これがコストアップ要因であるほか、載せ換え時に
異物故障等が発生して歩留まりが低下することもある。In order to produce a seamless belt made of a polyimide resin, for example, as disclosed in Japanese Patent Application Laid-Open Nos. 10-100171 and 10-296676, a polyimide precursor solution is coated on the inner surface of a cylindrical body. And expand
Centrifugal molding method of drying while rotating, JP-A-1-139
No. 228 discloses an inner surface coating method. However, in order to finally heat cure, a process of replacing the coating from the inner surface of the cylindrical body to the heating core is necessary, which is a cost increase factor, and foreign matter failure etc. occurs at the time of replacement. Yield may decrease.
【０００５】他の継ぎ目なしベルトの製造方法として、
例えば、特開昭６１−２７３９１９号公報に記載されて
いるように、所望の外径の芯体を用意し、その表面に浸
漬塗布方法によってポリイミド樹脂被膜を形成した後、
被膜を剥離する方法もある。[0005] As another method of manufacturing a seamless belt,
For example, as described in JP-A-61-273919, a core having a desired outer diameter is prepared, and a polyimide resin film is formed on the surface by a dip coating method.
There is also a method of removing the coating.
【０００６】ここで、ポリイミド樹脂被膜は、一般にポ
リイミド樹脂前駆体が溶解した溶液を塗布し、溶剤を乾
燥した後、加熱硬化して形成される。このときの溶剤と
しては、非プロトン系極性溶剤が用いられるが、非プロ
トン性極性溶剤は、いずれも沸点が高く、乾燥が非常に
遅いという性質がある。更に、ポリイミド樹脂はガス透
過性の低い樹脂であるため、溶剤を乾燥させようとして
も一部が残留する。Here, the polyimide resin film is generally formed by applying a solution in which a polyimide resin precursor is dissolved, drying the solvent, and heat-curing. As the solvent at this time, an aprotic polar solvent is used, and all aprotic polar solvents have a high boiling point and a very slow drying property. Furthermore, since the polyimide resin is a resin having low gas permeability, a part of the polyimide resin remains even when the solvent is dried.
【０００７】浸漬塗布方法など、芯体表面に被膜を形成
した後で剥離する方法によるポリイミド樹脂被膜の製造
方法においては、溶剤乾燥後の加熱硬化工程において、
溶剤乾燥工程において除去されなかった溶剤や、イミド
化反応が進行する段階で発生する水が、被膜内部や芯体
と被膜との間に滞留していると、加熱時の熱で膨張し、
膜厚や外径が不均一になって変形をきたすことがある。
均一なベルトを得ることは膜厚が厚くなるほど困難であ
った。In a method for producing a polyimide resin film by a method in which a film is formed on the surface of a core body and then peeled off, such as a dip coating method, a heating and curing step after drying a solvent involves
If the solvent not removed in the solvent drying step or water generated at the stage where the imidization reaction proceeds is staying between the inside of the coating or the core and the coating, it expands due to heat at the time of heating,
The film thickness and the outer diameter may become non-uniform and deform.
It was difficult to obtain a uniform belt as the film thickness increased.
【０００８】このようなポリイミド樹脂被膜に限らず、
他の樹脂被膜を形成する際も、同様な問題が生じ、改善
が望まれていた。[0008] Not limited to such a polyimide resin film,
Similar problems occur when other resin coatings are formed, and improvements have been desired.
【０００９】[0009]
【発明が解決しようとする課題】本発明は、従来におけ
る諸問題を解決し、樹脂の被膜を形成するに際して、加
熱硬化時に膨張しようとするガスを効果的に逃がすこと
で、均一な樹脂被膜を得ることができる被膜形成方法、
並びに、継ぎ目なしベルト及び継ぎ目なしベルトの製造
方法を提供することを目的する。DISCLOSURE OF THE INVENTION The present invention solves the problems in the prior art and, when forming a resin film, effectively releases a gas that tends to expand during heating and curing to form a uniform resin film. A film forming method that can be obtained,
It is another object of the present invention to provide a seamless belt and a method for manufacturing the seamless belt.
【００１０】[0010]
【課題を解決するための手段】上記課題は、以下の手段
により解決される。即ち、本発明は、 ＜１＞表面を粗面化した基体を用い、前記基体の表面に
樹脂溶液を均一に塗布して塗膜を形成し、該塗膜を基体
上に保持したまま加熱して樹脂を成膜することを特徴と
する被膜形成方法。 ＜２＞表面に穴を設けた基体を用い、前記基体の表面に
樹脂溶液を均一に塗布して塗膜を形成し、該塗膜を基体
上に保持したまま加熱して樹脂を成膜することを特徴と
する被膜形成方法。 ＜３＞表面を粗面化した芯体を用い、前記芯体の表面に
樹脂溶液を均一に塗布して塗膜を形成し、該塗膜を芯体
上に保持したまま加熱して樹脂を成膜した後、芯体から
分離することを特徴とする継ぎ目なしベルトの製造方
法。 ＜４＞表面に穴を設けた芯体を用い、前記芯体の表面に
樹脂溶液を均一に塗布して塗膜を形成し、該塗膜を芯体
上に保持したまま加熱して樹脂を成膜した後、芯体から
分離することを特徴とする継ぎ目なしベルトの製造方
法。 ＜５＞樹脂溶液としてポリイミド前駆体を用い、ポリイ
ミド被膜からなる継ぎ目なしベルトを製造することを特
徴とする前記＜３＞又は＜４＞に記載の継ぎ目なしベル
トの製造方法。 ＜６＞前記＜３＞〜＜５＞のいずれかに記載の継ぎ目な
しベルトの製造方法により得られることを特徴とする継
ぎ目なしベルト。 ＜７＞表面と裏面の粗さが異なることを特徴とする前記
＜６＞に記載の継ぎ目なしベルト。The above object is achieved by the following means. That is, the present invention relates to <1> using a substrate having a roughened surface, uniformly applying a resin solution to the surface of the substrate to form a coating film, and heating the coating film while holding the coating film on the substrate. A method for forming a coating film, comprising forming a resin film by heating. <2> Using a substrate provided with holes on the surface, a resin solution is uniformly applied to the surface of the substrate to form a coating film, and the resin film is formed by heating while holding the coating film on the substrate. A method for forming a coating film, comprising: <3> Using a core having a roughened surface, a resin solution is uniformly applied to the surface of the core to form a coating film, and the resin is heated by holding the coating film on the core to heat the resin. A method for producing a seamless belt, comprising separating a film from a core after forming the film. <4> Using a core provided with holes on the surface, a resin solution is uniformly applied to the surface of the core to form a coating film, and the resin is heated by holding the coating film on the core to heat the resin. A method for producing a seamless belt, comprising separating a film from a core after forming the film. <5> The method for producing a seamless belt according to <3> or <4>, wherein a seamless belt made of a polyimide film is produced using a polyimide precursor as a resin solution. <6> A seamless belt obtained by the method for producing a seamless belt according to any one of <3> to <5>. <7> The seamless belt according to <6>, wherein the surface and the back have different roughness.
【００１１】[0011]
【発明の実施の形態】（被膜形成方法）本発明の被膜形
成方法は、基体の表面に樹脂溶液を均一に塗布して塗膜
を形成し、該塗膜を基体上に保持したまま加熱して樹脂
を成膜する方法であって、前記芯体として、表面を粗面
化した或いは表面に穴を設けた基体（以下、単に「基
体」という）を用いる。一般的に、樹脂塗膜を加熱して
成膜する際、塗膜に含まれる残留溶剤、或いは加熱反応
時に樹脂から発生する水が熱で膨張して高圧のガスとな
り、樹脂被膜に膨れが生じることが避けられない。この
ため、基体の表面を粗面化或いは穴を設けて、基体加熱
時に発生する気体を逃がす機能を持たせることで、樹脂
塗膜の加熱時に発生するガスを効果的に逃がすことがで
き、被膜の膨張を防止することができる。従って、均一
な被膜を得ることができる。なお、以下、基体表面とは
被膜を形成する面のことを示す。また、被膜表面とは基
体とは接しない方の面を示し、裏面とは基体と接する面
を示す。BEST MODE FOR CARRYING OUT THE INVENTION (Coating Method) In a coating forming method of the present invention, a resin solution is uniformly applied to the surface of a substrate to form a coating film, and the coating film is heated while being held on the substrate. In this method, a substrate having a roughened surface or a hole provided in the surface (hereinafter simply referred to as a “substrate”) is used as the core. Generally, when a resin coating is heated to form a film, residual solvent contained in the coating or water generated from the resin during the heating reaction expands with heat to become a high-pressure gas, and the resin coating swells. That is inevitable. For this reason, the surface of the substrate is roughened or a hole is provided to allow the gas generated during heating of the substrate to escape, so that the gas generated during heating of the resin coating can be effectively released. Can be prevented from expanding. Therefore, a uniform coating can be obtained. Hereinafter, the substrate surface refers to a surface on which a film is formed. In addition, the surface of the coating indicates a surface that is not in contact with the substrate, and the back surface indicates a surface that is in contact with the substrate.
【００１２】基体として、表面を粗面化した基体につい
て説明する。基体は、図１に示すように、基体（芯体）
１の表面は、粗面化してなる面１３を有するが（図１に
示す基体は筒状の芯体である。）、粗面化により、樹脂
塗膜の加熱時に生じる残留溶剤または水が膨張した気体
は、樹脂被膜と芯体表面の間に僅かながら隙間が生じ、
その隙間から放出され、被膜が膨れることはなくなる。A substrate having a roughened surface will be described. The base is a base (core) as shown in FIG.
The surface 1 has a roughened surface 13 (the substrate shown in FIG. 1 is a cylindrical core), but due to the roughening, residual solvent or water generated when the resin coating is heated expands. The gas has a slight gap between the resin coating and the core surface,
The film is released from the gap and the coating does not swell.
【００１３】基体表面の表面粗さＲａとしては、０．１
μｍであることが好ましいが、被膜の膨張は、特に被膜
の膜厚が例えば５０μｍを越えるような厚い場合に顕著
であるため、被膜の膜厚によって、ガス抜きに必要な基
体の表面粗さの好適な値は異なってくる。膜厚が１０〜
２５μｍの薄膜である場合、ガスの発生量が少ないこと
と、被膜のガス透過性が比較的良いので特に制限はない
が、膜厚が薄いことから基体表面の粗さが被膜表面に影
響し易いので、表面粗さＲａは０．１〜０．８μｍの範
囲であることが好ましく、より好ましくはＲａ０．１〜
０．３μｍの範囲である。また、膜厚が２６〜５０μｍ
の場合は、ガスの発生量が増加し、被膜のガス透過性も
低下するが、被膜表面への影響を考慮すると、表面粗さ
Ｒａは０．１〜１．５μｍの範囲であることが好まし
く、より好ましくはＲａ０．３〜１．２μｍの範囲であ
る。また、膜厚が５１μｍ〜１２０μｍの場合はさらに
ガスの発生量が増し、ガス透過性も低下するため、基体
表面粗さは大きくする必要があるが、被膜表面への影響
を考慮すると、表面粗さＲａは０．３〜２．９μｍの範
囲であることが好ましく、より好ましくはＲａ０．５〜
２．０μｍの範囲である。なお、表面粗さＲａとは粗さ
の尺度の一つである算術平均粗さであり、公知の触針式
表面粗さ測定機（例えばサーフコム１４００Ａ、東京精
密社製等）を使用して測定することができる。Ｒａの測
定条件としては、ＪＩＳ Ｂ０６０１−１９９４に準拠
し、評価長さＬｎ＝４ｍｍ、基準長さＬ＝０．８ｍｍ、
カットオフ値＝０．８ｍｍで測定することが好ましい
が、本発明においてはこれに限定されるものではない。The surface roughness Ra of the substrate surface is 0.1
Although it is preferable that the thickness of the film is large, the expansion of the film is particularly remarkable when the film thickness is large, for example, exceeding 50 μm. Suitable values will vary. The film thickness is 10
In the case of a thin film having a thickness of 25 μm, there is no particular limitation because the amount of generated gas is small and the gas permeability of the film is relatively good. However, since the film is thin, the roughness of the substrate surface easily affects the film surface. Therefore, the surface roughness Ra is preferably in the range of 0.1 to 0.8 μm, more preferably Ra 0.1 to 0.8 μm.
The range is 0.3 μm. In addition, the film thickness is 26 to 50 μm
In the case of, the amount of generated gas increases, and the gas permeability of the coating also decreases, but considering the influence on the coating surface, the surface roughness Ra is preferably in the range of 0.1 to 1.5 μm. , And more preferably Ra is in the range of 0.3 to 1.2 μm. When the film thickness is 51 μm to 120 μm, the amount of generated gas is further increased, and the gas permeability is also reduced. Therefore, it is necessary to increase the substrate surface roughness. The Ra is preferably in the range of 0.3 to 2.9 μm, more preferably Ra 0.5 to
The range is 2.0 μm. The surface roughness Ra is an arithmetic average roughness, which is one of the measures of roughness, and is measured using a known stylus type surface roughness measuring device (for example, Surfcom 1400A, manufactured by Tokyo Seimitsu Co., Ltd.). can do. The measurement conditions of Ra are based on JIS B0601-1994, and the evaluation length Ln = 4 mm, the reference length L = 0.8 mm,
It is preferable to measure at a cutoff value of 0.8 mm, but the present invention is not limited to this.
【００１４】ここで、基体表面を粗面化する方法として
は、乾式で粒子を吹き付けるブラスト加工法、湿式で粒
子を吹き付けるホーニング加工法、あるいは砥石研削
法、サンドペーパーで粗す方法などがある。これらの中
では、ブラスト加工法が、粗度の安定性、あるいは生産
性やコストの面から、最も好ましい。粗度は粒子の種
類、大きさ、形状、および吹きつけ圧力等によって制御
することができる。Here, as a method for roughening the surface of the substrate, there are a blasting method in which particles are blown dry, a honing method in which particles are blown wet, a grinding method with a grindstone, and a method of roughening with sandpaper. Among these, the blasting method is most preferable in terms of stability of roughness, productivity, and cost. The roughness can be controlled by the type, size, shape, spraying pressure and the like of the particles.
【００１５】基体表面と被膜裏面との粗さの関係はほぼ
直線的で、基体表面の粗さが大きくなるに従い、被膜裏
面の粗さも大きくなる。また、被膜表面の表面粗さに関
しては、被膜の膜厚により影響は異なる。被膜の膜厚が
薄い程被膜表面が基体表面から受ける影響は大きく、被
膜の膜厚が厚くなると被膜表面が受ける影響は小さくな
る。被膜の表面粗さについては、使用目的によって異な
り、適宜選択するればよい。なお、基体の表面粗さにつ
いては、必要となる膜厚、被膜の表面粗さによって決定
する事ができ、表面と裏面とで粗さが異なった、膨れが
発生しない均一な被膜となる。The relationship between the surface roughness of the substrate and the back surface of the coating is almost linear, and the roughness of the back surface of the coating increases as the surface roughness of the substrate increases. Further, the influence of the surface roughness of the film surface differs depending on the film thickness of the film. The smaller the thickness of the coating, the greater the influence of the coating surface from the substrate surface, and the greater the thickness of the coating, the smaller the effect of the coating surface. The surface roughness of the coating varies depending on the purpose of use and may be appropriately selected. The surface roughness of the substrate can be determined according to the required film thickness and the surface roughness of the film, and a uniform film having different roughness between the front surface and the rear surface and without swelling is obtained.
【００１６】基体として、表面に穴を設けた基体につい
て説明する。基体は、図２に示すように、基体（芯体）
１の表面には、所定の間隔で複数の穴１４を設けるが
（図１に示す基体は筒状の芯体である。）、穴１４を設
けることで、樹脂塗膜の加熱時に生じる残留溶剤または
水が膨張した気体は、この穴１４を通じて放出され、被
膜が膨れることはなくなる。A substrate having a hole on its surface will be described as the substrate. The base is a base (core) as shown in FIG.
A plurality of holes 14 are provided at predetermined intervals on the surface of the substrate 1 (the base shown in FIG. 1 is a cylindrical core). Alternatively, the gas in which the water has expanded is released through the hole 14, and the coating does not swell.
【００１７】基体表面に設ける穴の形状は、特に制限は
なく、円型、楕円型、四角型等、適宜選択すればよい
が、加工容易性等の観点から円型が好ましい。また、穴
の大きさは、小さいほど好ましく、具体的には直径（最
大径）が１ｍｍ以下であることが好ましく、より好まし
くは０．２ｍｍ以下である。この径が１ｍｍを越える
と、穴から樹脂溶液が漏れてしまう、被膜裏面に大きな
凹凸が形成される等の問題が生じ易くなる。穴は、基板
に対し貫通した穴でもよいし、底面を持つ貫通していな
い穴でもよい。また、穴の数や設ける間隔は、適宜設定
することができる。The shape of the hole provided on the surface of the substrate is not particularly limited, and may be appropriately selected from a circle, an ellipse, a square, and the like, but a circle is preferable from the viewpoint of ease of processing. Further, the size of the hole is preferably as small as possible, and specifically, the diameter (maximum diameter) is preferably 1 mm or less, more preferably 0.2 mm or less. If the diameter exceeds 1 mm, problems such as leakage of the resin solution from the hole and formation of large irregularities on the back surface of the coating are likely to occur. The hole may be a hole penetrating the substrate or a non-penetrating hole having a bottom surface. In addition, the number of holes and the interval between the holes can be set as appropriate.
【００１８】本発明の被膜形成方法において、基体は被
膜を塗布形成する基板に相当するものであり、その材料
種及び形状は、用途に応じて適宜選択することができ
る。例えば、後述する継ぎ目なしベルトを作製する場
合、基体として筒状或いは柱状の芯体が用いられる。In the method of forming a film according to the present invention, the substrate corresponds to the substrate on which the film is to be formed, and its material type and shape can be appropriately selected according to the application. For example, when producing a seamless belt described later, a tubular or columnar core is used as a base.
【００１９】本発明の被膜形成方法において、形成され
る樹脂種は、用途に応じて適宜選択することができる
が、例えば、ポリイミド、ポリアミドイミド、ポリベン
ズイミダゾール、ナイロン、ポリビニルブチラール、ポ
リカーボネート、ポリアリレート、ポリメチルメタクリ
レート、ポリエステル等の汎用樹脂等が挙げられる。In the method of forming a film according to the present invention, the kind of resin to be formed can be appropriately selected according to the intended use. Examples thereof include polyimide, polyamideimide, polybenzimidazole, nylon, polyvinyl butyral, polycarbonate, and polyarylate. And general-purpose resins such as polymethyl methacrylate and polyester.
【００２０】本発明の被膜形成方法は、上述した特定の
表面状態の基体を用いる以外は、樹脂の種類に応じて、
従来の公知の方法に従って形成することができる。この
ように、本発明の被膜形成方法は、様々な用途の被膜を
形成に適用することができるが、特に後述する継ぎ目な
しベルトの製造方法に好適に適用することができる。The method of forming a film according to the present invention comprises the steps of:
It can be formed according to a conventionally known method. As described above, the film forming method of the present invention can be applied to the formation of films for various uses, but can be particularly suitably applied to a method of manufacturing a seamless belt described later.
【００２１】（継ぎ目なしベルトの製造方法）本発明の
継ぎ目なしベルトの製造方法は、芯体の表面に樹脂溶液
を均一に塗布して塗膜を形成し、該塗膜を芯体上に保持
したまま加熱して樹脂を成膜した後、芯体から分離して
継ぎ目なしベルトを用いる方法であって、前記芯体とし
て、表面を粗面化した或いは表面に穴を設けた芯体（以
下、単に「芯体」という）を用いる。芯体の表面を粗面
化或いは穴を設けて、芯体加熱時に発生する気体を逃が
す機能を持たせることで、樹脂塗膜の加熱時に発生する
ガスを効果的に逃がすことができ、被膜の膨張を防止す
ることができる。従って、均一な被膜からなるベルトを
容易に得ることができる。なお、以下、芯体表面とは被
膜を形成する面のことを示す。また、ベルト表面とは芯
体とは接しない方の面を示し、裏面とは芯体と接する面
を示す。(Method of Manufacturing Seamless Belt) In the method of manufacturing a seamless belt of the present invention, a resin solution is uniformly applied to the surface of a core to form a coating film, and the coating film is held on the core. A method of using a seamless belt separated from a core after heating to form a resin film, wherein the core has a roughened surface or a hole in the surface (hereinafter referred to as a core). , Simply referred to as “core”). By roughening the surface of the core or providing holes to allow the gas generated during heating of the core to escape, the gas generated during heating of the resin coating can be effectively released, Inflation can be prevented. Therefore, a belt having a uniform coating can be easily obtained. Hereinafter, the core body surface indicates the surface on which the coating is formed. Further, the surface of the belt indicates a surface that is not in contact with the core, and the back surface indicates a surface that is in contact with the core.
【００２２】芯体は、前記本発明の被膜形成方法で用い
る基体と同様であるので、その詳細は省略するが、上述
したように基体（ここでは芯体）表面と被膜（ここでは
ベルト）裏面との粗さの関係はほぼ直線的で、基体（芯
体）表面の粗さが大きくなるに従い、被膜裏面の粗さも
大きくなる。このため、例えば、得られる継ぎ目なしベ
ルトを、画像形成装置の定着ベルトや中間転写ベルト等
に用いる場合、ベルト面の表面粗さＲａは総じて３．０
μｍ以下であることが好ましい。表面粗さＲａが０．３
μｍを超えると、面が粗くなりすぎ、画像欠陥等の問題
が生じやすく、表面粗さＲａは０．３μｍ以下が好まし
い。よって、このベルトの表面粗さを考慮しても、各ベ
ルト膜厚に対する好適な芯体表面粗さＲａは、上述した
範囲と同様の範囲が好ましい。芯体表面粗さについて
は、継ぎ目なしベルトを画像形成装置分野で使用する
際、画質上はベルト表面は平滑、ベルト走行機能上とし
てベルト裏面は粗面、というように、表面と裏面の粗さ
が異なるベルトを要求されることがあるが、本発明の継
ぎ目なしベルトの製造方法においては、必要となるベル
ト膜厚、ベルトの表面粗さを適宜決定する事ができるた
め、表面と裏面とで粗さが異なった、膨れが発生しない
均一なベルトを製造することができる。The core is the same as the substrate used in the method of forming a film according to the present invention, and the details thereof are omitted. However, as described above, the front surface of the substrate (here, the core) and the rear surface of the film (here, the belt) Is substantially linear, and as the surface roughness of the substrate (core) increases, the roughness of the back surface of the coating increases. Therefore, for example, when the obtained seamless belt is used as a fixing belt or an intermediate transfer belt of an image forming apparatus, the surface roughness Ra of the belt surface is generally 3.0.
It is preferably not more than μm. Surface roughness Ra is 0.3
If it exceeds μm, the surface becomes too rough, and problems such as image defects are likely to occur. The surface roughness Ra is preferably 0.3 μm or less. Therefore, even in consideration of the surface roughness of this belt, the suitable core surface roughness Ra for each belt film thickness is preferably in the same range as the above-described range. Regarding the surface roughness of the core, when a seamless belt is used in the field of image forming apparatus, the surface quality is smooth on the belt surface, the belt back function is rough on the belt back surface, and so on. Although a different belt may be required, in the method of manufacturing a seamless belt of the present invention, the required belt film thickness, since the surface roughness of the belt can be appropriately determined, the front and back surface A uniform belt with different roughness and no swelling can be manufactured.
【００２３】芯体の形状としては、目的に応じて適宜選
択することができるが、例えば円柱状又は円筒状、楕円
柱状又は楕円筒状が挙げられる。芯体の材質は、アルミ
ニウムや銅、ステンレス等の金属が好ましい。その際、
表面をクロムやニッケルでメッキしたり、フッ素樹脂や
シリコーン樹脂で表面を被覆したり、あるいは表面にポ
リイミド樹脂が接着しないよう、離型剤を塗布すること
も有効である。The shape of the core can be appropriately selected according to the purpose, and examples thereof include a column or a cylinder, an elliptical column and an elliptic cylinder. The material of the core body is preferably a metal such as aluminum, copper, and stainless steel. that time,
It is also effective to plate the surface with chromium or nickel, coat the surface with a fluorine resin or silicone resin, or apply a release agent so that the polyimide resin does not adhere to the surface.
【００２４】本発明の継ぎ目なしベルトの製造方法にお
いて、形成される樹脂種は、上述のように、用途に応じ
て適宜選択することができ、また、その形成方法も従来
公知の方法にて形成することができる。特に樹脂種とし
ては、ポリイミド樹脂が耐熱性、耐久性などの観点から
利用頻度が高い観点から好ましい。In the method for producing a seamless belt according to the present invention, the kind of resin to be formed can be appropriately selected according to the application as described above, and the method for forming the resin can be formed by a conventionally known method. can do. In particular, as a resin type, a polyimide resin is preferable from the viewpoint of high use frequency from the viewpoint of heat resistance, durability and the like.
【００２５】ここで、ポリイミド樹脂被膜からなる継ぎ
目なしベルトの製造方法の詳細を説明する。ポリイミド
樹脂被膜からなる継ぎ目なしベルトの製造方法は、金属
製の柱状又は筒状の芯体上に、ポリイミド前駆体を非プ
ロトン系極性溶剤に溶解した溶液を塗布し、ポリイミド
前駆体塗膜を形成する工程（以下、「ポリイミド前駆体
塗膜形成工程」という）と、ポリイミド前駆体塗膜から
溶剤を除去して、ポリイミド前駆体が析出したポリイミ
ド前駆体被膜を形成する工程（以下、「ポリイミド前駆
体析出工程」という）と、ポリイミド前駆体被膜を、乾
燥、加熱硬化して、ポリイミド樹脂被膜を形成する工程
と（以下、「ポリイミド樹脂被膜形成工程」という）、
ポリイミド樹脂被膜を芯体から剥離する工程とを有す
る。また、必要に応じてその他の工程を有してもよい。Here, a method of manufacturing a seamless belt made of a polyimide resin film will be described in detail. The method for producing a seamless belt made of a polyimide resin film is to apply a solution of a polyimide precursor dissolved in an aprotic polar solvent on a metal columnar or cylindrical core to form a polyimide precursor coating film (Hereinafter, referred to as a “polyimide precursor coating film forming step”) and a step of removing a solvent from the polyimide precursor coating film to form a polyimide precursor coating film on which the polyimide precursor is deposited (hereinafter, “polyimide precursor coating film forming step”). A step of forming a polyimide resin film by drying and heating and curing the polyimide precursor film (hereinafter, referred to as a “polyimide resin film forming step”);
Separating the polyimide resin film from the core. Further, other steps may be provided as necessary.
【００２６】−ポリイミド前駆体塗膜形成工程− ポリイミド前駆体塗膜形成工程において、ポリイミド前
駆体を非プロトン系極性溶剤に溶解してポリイミド前駆
体溶液を調製するが、該ポリイミド前駆体としては、従
来公知のものを用いることができる。また、非プロトン
系極性溶剤としては、Ｎ−メチルピロリドン、Ｎ，Ｎ−
ジメチルアセトアミド、アセトアミド、Ｎ，Ｎ−ジメチ
ルホルムアミド等、従来公知のものを用いることができ
る。なお、調製の際における混合比、粘度等は、適宜選
択して行われる。-Polyimide precursor coating film forming step-In the polyimide precursor coating film forming step, a polyimide precursor is dissolved in an aprotic polar solvent to prepare a polyimide precursor solution. Conventionally known ones can be used. Further, as the aprotic polar solvent, N-methylpyrrolidone, N, N-
Conventionally known compounds such as dimethylacetamide, acetamide, and N, N-dimethylformamide can be used. The mixing ratio, viscosity and the like in the preparation are appropriately selected and performed.
【００２７】ポリイミド前駆体塗膜形成工程おいて、前
記該ポリイミド前駆体溶液を芯体上に塗布し、ポリイミ
ド前駆体塗膜を形成するが、その塗布方法としては、芯
体の形状にもよるが、芯体をポリイミド前駆体溶液に浸
漬して引き上げる浸漬塗布法、芯体を水平方向に回転さ
せながらその表面にポリイミド前駆体溶液を吐出する流
し塗り法、その際にブレードで被膜をメタリングするブ
レード塗布法、既存の公知の方法が採用できる。上記流
し塗り法やブレード塗布法では、塗布部を芯体の軸方向
に水平移動させることにより被膜はらせん状に形成され
るが、ポリイミド前駆体溶液の溶剤は常温での乾燥が遅
いために継ぎ目は自然に平滑化される。In the step of forming a polyimide precursor coating film, the polyimide precursor solution is applied on a core to form a polyimide precursor coating. The coating method depends on the shape of the core. However, a dip coating method in which the core is dipped in the polyimide precursor solution and pulled up, a flow coating method in which the polyimide precursor solution is discharged onto the surface while rotating the core in the horizontal direction, and at that time, the coating is metered with a blade A blade coating method or an existing known method can be adopted. In the above-mentioned flow coating method or blade coating method, the coating is formed in a spiral shape by moving the coating portion horizontally in the axial direction of the core, but the solvent of the polyimide precursor solution is slow to dry at room temperature, so that the seam is formed. Is naturally smoothed.
【００２８】ポリイミド前駆体塗膜形成工程おいて、ポ
リイミド前駆体溶液の塗布を浸漬塗布方法で行う場合、
ポリイミド前駆体溶液は粘度が非常に高いので、膜厚が
所望値より厚くなりすぎることがある。その際には、以
下に示すような、フロートにより膜厚を制御する浸漬塗
布法が好適に適用できる。In the polyimide precursor coating film forming step, when the application of the polyimide precursor solution is performed by a dip coating method,
Since the viscosity of the polyimide precursor solution is very high, the film thickness may be too large than desired. In this case, a dip coating method in which the film thickness is controlled by a float as described below can be suitably applied.
【００２９】フロートにより膜厚を制御する浸漬塗布法
を、図３〜５を参照して説明する。なお、芯体が、円柱
又は円筒状の場合を説明する。図３はフロートにより膜
厚を制御する浸漬塗布方法に用いる塗布装置の一例を示
す概略構成図である。図３に示すように、この浸漬塗布
法は、塗布槽３に満たされたポリイミド前駆体溶液２
に、芯体１よりも大きな孔を設けたフロート５を浮か
べ、該孔を通して芯体１ポリイミド前駆体溶液２に浸漬
し、次いで引き上げる塗布法である。但し、図３は主要
部のみを示した図面であり、他の装置は省略した。The dip coating method for controlling the film thickness by a float will be described with reference to FIGS. The case where the core is cylindrical or cylindrical will be described. FIG. 3 is a schematic configuration diagram showing an example of a coating apparatus used for a dip coating method of controlling a film thickness by a float. As shown in FIG. 3, the dip coating method uses a polyimide precursor solution 2 filled in a coating tank 3.
In this method, a float 5 having a hole larger than the core 1 is floated, the core 5 is immersed in the polyimide precursor solution 2 through the hole, and then pulled up. However, FIG. 3 is a diagram showing only a main part, and other devices are omitted.
【００３０】図４はフロートの概略斜視図を示す。図４
に示すように、ポリイミド前駆体溶液２上に、芯体１の
外径よりも一定の間隙だけ大きい孔６を設けたフロート
５を浮かべてある。FIG. 4 is a schematic perspective view of the float. FIG.
As shown in (1), a float 5 having a hole 6 larger than the outer diameter of the core 1 by a certain gap is floated on the polyimide precursor solution 2.
【００３１】フロート５は、ポリイミド前駆体溶液２上
に浮くものであれば、どのような材質のものであっても
よい。但し、その材質は、ポリイミド前駆体溶液によっ
て侵されないものであるのがよい。材質として、例えば
種々の金属、種々のプラスチック等が挙げられる。ま
た、フロート５の構造が中空構造であってもよい。The float 5 may be made of any material as long as it floats on the polyimide precursor solution 2. However, it is preferable that the material is not affected by the polyimide precursor solution. Examples of the material include various metals and various plastics. Further, the structure of the float 5 may be a hollow structure.
【００３２】また、フロート５が塗布槽３の中央部に位
置するように、フロート５を一時的に固定する固定手段
を設けてもよい。このような固定手段としてフロート５
に足を設ける手段などがある。但し、これらの固定手段
を用いた場合、後述するように、芯体１を浸漬した後、
引き上げる際に、フロート５が自由に動き得るように、
それらは取り外し可能なように配置されているのがよ
い。A fixing means for temporarily fixing the float 5 may be provided so that the float 5 is located at the center of the coating tank 3. Float 5 as such fixing means
There is a means for providing a foot to the vehicle. However, when these fixing means are used, as described later, after the core body 1 is immersed,
When lifting, float 5 can move freely.
They should be arranged so that they can be removed.
【００３３】芯体１の外径と孔６の内径の間隙は、所望
の塗布膜厚を鑑みて調整する。即ち、所望の膜厚、即ち
乾燥膜厚は、濡れ膜厚とポリイミド前駆体溶液２の不揮
発分濃度の積になる。これから、所望の濡れ膜厚が求め
られる。また、芯体１の外径と孔６の内径の間隙は、所
望の濡れ膜厚の１倍〜３倍であるのがよい。１倍〜３倍
とするのは、ポリイミド前駆体溶液２の粘度及び／又は
表面張力などにより、間隙の距離が濡れ膜厚になるとは
限らないからである。このように、所望の乾燥膜厚及び
所望の濡れ膜厚から、所望の孔６の内径が求められる。The gap between the outer diameter of the core 1 and the inner diameter of the hole 6 is adjusted in consideration of a desired coating film thickness. That is, the desired film thickness, that is, the dry film thickness is the product of the wet film thickness and the nonvolatile content of the polyimide precursor solution 2. From this, a desired wet film thickness is determined. The gap between the outer diameter of the core 1 and the inner diameter of the hole 6 is preferably 1 to 3 times the desired wet film thickness. The reason for setting the value to 1 to 3 times is that the distance of the gap does not always become the wet film thickness due to the viscosity and / or surface tension of the polyimide precursor solution 2. Thus, the desired inner diameter of the hole 6 is determined from the desired dry film thickness and the desired wet film thickness.
【００３４】フロート５に設けられる孔６の内壁は、例
えば、図３に示す断面図に示す直線状であり且つその直
線がポリイミド前駆体溶液の液面に垂直であるもの、図
５（ａ）に示すように、ポリイミド前駆体溶液２に浸る
下部が広く、上部が狭い、斜めの直線状７であるもの、
又は図５（ｂ）に示すように、ポリイミド前駆体溶液２
に浸る下部と上部が広く、上端部よりやや下に最も狭い
部分を有する形状（断面が三角形）８が挙げられる。特
に、図５（ａ）又は図５（ｂ）に示すように、ポリイミ
ド前駆体溶液２に浸る下部が広い形状が好ましい。The inner wall of the hole 6 provided in the float 5 is, for example, a straight line shown in the sectional view shown in FIG. 3 and the straight line is perpendicular to the liquid surface of the polyimide precursor solution, FIG. As shown in the figure, the lower part immersed in the polyimide precursor solution 2 is wide, the upper part is narrow,
Or, as shown in FIG.
The shape (cross section is triangular) 8 has a lower part and an upper part which are immersed in the upper part, and a narrow part slightly below the upper part. In particular, as shown in FIG. 5A or FIG. 5B, a shape in which the lower part immersed in the polyimide precursor solution 2 is wide is preferable.
【００３５】浸漬塗布を行う際、芯体１を孔６を通して
ポリイミド前駆体溶液２に浸漬する。次いで、孔６を通
して芯体１を引き上げる。この際、芯体１と孔６との間
隙により被膜４が形成される。引き上げ速度としては５
０〜５００ｍｍ／ｍｉｎ程度であるのが好ましい。この
塗布方法に好ましいポリイミド前駆体溶液の固形分濃度
は１０〜４０％、粘度は１〜１００Ｐａ・ｓである。When performing dip coating, the core 1 is immersed in the polyimide precursor solution 2 through the holes 6. Next, the core 1 is pulled up through the hole 6. At this time, the coating 4 is formed by the gap between the core 1 and the hole 6. The lifting speed is 5
It is preferably about 0 to 500 mm / min. The polyimide precursor solution preferably has a solid concentration of 10 to 40% and a viscosity of 1 to 100 Pa · s for this coating method.
【００３６】フロート５はポリイミド前駆体溶液２上を
自由に動くことができる。また、フロートの孔６が円形
であり、且つ被塗布物の断面の外周も円形である。した
がって、芯体１を孔６を通して引き上げる際、芯体１と
フロート５との摩擦抵抗が一定になるように、フロート
５は自由に動くことができる。即ち、芯体１を引き上げ
る際、ある位置で、フロート５と芯体１との間隙が狭ま
ろうとした場合、狭まろうとした部分では摩擦抵抗が大
きくなる一方、その反対側では摩擦抵抗が小さくなると
いう、一時的に摩擦抵抗が不均一な状態が生じうる。し
かしながら、フロート５が自由に動くこと、並びに芯体
１の断面が円形であること及びフロートの孔６が円形で
あることから、そのような摩擦抵抗が不均一な状態から
均一な状態になるように、フロート５が動く。したがっ
て、フロート５が芯体１と接触するようなことはない。The float 5 can move freely on the polyimide precursor solution 2. The hole 6 of the float is circular, and the outer periphery of the cross section of the object is also circular. Therefore, when the core 1 is pulled up through the hole 6, the float 5 can move freely so that the frictional resistance between the core 1 and the float 5 becomes constant. That is, when the gap between the float 5 and the core body 1 is to be narrowed at a certain position when the core body 1 is pulled up, the frictional resistance increases at the portion where the float 5 is to be narrowed, and the frictional resistance decreases at the opposite side. That is, the frictional resistance may be temporarily non-uniform. However, since the float 5 moves freely and the cross section of the core 1 is circular and the hole 6 of the float is circular, such a frictional resistance is changed from a non-uniform state to a uniform state. Then, the float 5 moves. Therefore, the float 5 does not come into contact with the core 1.
【００３７】また、摩擦抵抗が均一となる位置は、芯体
１の外周の円形と、フロートの孔６の円形とがほぼ同心
円となる位置である。よって、円柱又は円筒状の芯体１
断面の円の中心が、長手方向において、許容範囲内でず
れている場合であっても、フロート５はそれに追随する
ように動く。したがって、芯体表面にに一定の濡れ膜厚
のポリイミド前駆体塗膜４が塗布される。The position where the frictional resistance is uniform is a position where the circle of the outer periphery of the core 1 and the circle of the hole 6 of the float are substantially concentric. Therefore, a cylindrical or cylindrical core 1
Even if the center of the circle of the cross section is shifted within the allowable range in the longitudinal direction, the float 5 moves so as to follow it. Therefore, the polyimide precursor coating film 4 having a constant wet thickness is applied to the surface of the core body.
【００３８】−ポリイミド前駆体析出工程− ポリイミド前駆体析出工程においては、ポリイミド前駆
体塗膜から溶剤を除去する。その方法の一つとして、芯
体を水平に回転させながら加熱することで溶剤を除去す
る方法がある。一方、乾燥前のポリイミド前駆体塗膜
を、ポリイミド前駆体に不溶でかつ非プロトン系極性溶
剤と混和する第二の溶剤（以下、単に「第二の溶剤」と
いう）に接触させる方法をとってもよい。こうすること
で、濡れたポリイミド前駆体塗膜４から非プロトン系極
性溶剤が第二の溶剤中に染み出る。ポリイミド前駆体は
第二の溶剤には不溶なので、ポリイミド前駆体塗膜から
非プロトン系極性溶剤が離脱する共に、ポリイミド前駆
体はその表面から不溶物となって析出し、不透明状態の
固形化されたポリイミド前駆体被膜が形成される。その
結果、後述するようにポリイミド前駆体被膜の乾燥が速
やかに行われる。なお、この接触の際には、ポリイミド
前駆体被膜中には第二の溶剤がある程度浸透する。—Polyimide Precursor Deposition Step— In the polyimide precursor deposition step, the solvent is removed from the polyimide precursor coating film. As one of the methods, there is a method of removing the solvent by heating while rotating the core horizontally. On the other hand, a method may be employed in which the polyimide precursor coating before drying is brought into contact with a second solvent that is insoluble in the polyimide precursor and is mixed with the aprotic polar solvent (hereinafter, simply referred to as “second solvent”). . By doing so, the aprotic polar solvent oozes out of the wet polyimide precursor coating film 4 into the second solvent. Since the polyimide precursor is insoluble in the second solvent, the aprotic polar solvent is separated from the polyimide precursor coating film, and the polyimide precursor is separated from the surface as an insoluble substance and solidified in an opaque state. The resulting polyimide precursor coating is formed. As a result, the drying of the polyimide precursor coating is promptly performed as described later. At the time of this contact, the second solvent permeates to some extent into the polyimide precursor coating.
【００３９】ポリイミド前駆体析出工程において、ポリ
イミド前駆体塗膜と第二の溶剤との接触は、前記ポリイ
ミド前駆体塗膜形成工程を行った直後に行うことが好ま
しい。ポリイミド前駆体溶液塗布後において、ポリイミ
ド前駆体塗膜に含まれる非プロトン系極性溶剤は、前述
したように常温では極めて乾燥が遅いため、該塗膜はい
つまででも濡れたままで、塗膜は重力の影響を受けて常
に下方に垂れやすい。そのため、ポリイミド前駆体塗膜
形成工程を行った直後に、ポリイミド前駆体塗膜と第二
の溶剤との接触を行い、固形化されたポリイミド前駆体
被膜を形成することで、垂れを防止することができる。In the step of depositing the polyimide precursor, the contact between the polyimide precursor coating and the second solvent is preferably carried out immediately after the step of forming the polyimide precursor coating. After the application of the polyimide precursor solution, the aprotic polar solvent contained in the polyimide precursor coating film is extremely slow-drying at room temperature as described above, so that the coating film remains wet forever, and the coating film is subjected to gravity. Under the influence, it is always easy to hang down. Therefore, immediately after performing the polyimide precursor coating film forming step, by contacting the polyimide precursor coating film and the second solvent, by forming a solidified polyimide precursor coating, to prevent sagging Can be.
【００４０】ポリイミド前駆体析出工程において、ポリ
イミド前駆体塗膜と第二の溶剤との接触方法としては、
ポリイミド前駆体塗膜を第二の溶剤に浸漬する方法が特
に好適である。この方法を図６を参照して、説明する。
図６は、ポリイミド前駆体塗膜４を第二の溶剤に浸漬す
る方法を説明する概要図である。図６に示すように、ポ
リイミド前駆体被膜を形成した芯体１を、容器１２に満
たされた第二の溶剤１１中に浸漬する。これにより、ポ
リイミド前駆体被膜１０から非プロトン系極性溶剤が第
二の溶剤１１中に染み出て離脱し、均一なポリイミド前
駆体被膜１０を析出させることができる。In the step of depositing the polyimide precursor, the method of contacting the polyimide precursor coating film with the second solvent is as follows.
The method of dipping the polyimide precursor coating film in the second solvent is particularly preferred. This method will be described with reference to FIG.
FIG. 6 is a schematic diagram illustrating a method of dipping the polyimide precursor coating film 4 in a second solvent. As shown in FIG. 6, the core 1 on which the polyimide precursor coating is formed is immersed in a second solvent 11 filled in a container 12. As a result, the aprotic polar solvent oozes out of the polyimide precursor coating 10 into the second solvent 11 and is released, whereby a uniform polyimide precursor coating 10 can be deposited.
【００４１】ポリイミド前駆体析出工程において、ポリ
イミド前駆体塗膜と第二の溶剤との接触方法としては、
その他、ポリイミド前駆体塗膜に、第二の溶剤を流下さ
せたり、吹き付けてもよい。In the step of depositing the polyimide precursor, the method of contacting the polyimide precursor coating film with the second solvent includes:
In addition, the second solvent may be flowed down or sprayed on the polyimide precursor coating film.
【００４２】ポリイミド前駆体析出工程において、第二
の溶剤にポリイミド前駆体塗膜を接触させる時間によ
り、ポリイミド前駆体塗膜からの非プロトン系極性溶剤
の離脱量が変化する。ポリイミド前駆体塗膜から非プロ
トン系極性溶剤が完全になくなると、析出して固形化さ
れたポリイミド前駆体被膜はもろくなってしまう場合が
あり、微量に非プロトン系極性溶剤が残留している方が
好ましい。そのため、第二の溶剤へのポリイミド前駆体
塗膜の接触時間は、非プロトン系極性溶剤の種類とポリ
イミド前駆体塗膜の膜厚にもよるが、１０秒から１０分
間程度が好ましい。なお、ポリイミド前駆体塗膜の膜厚
が厚いほど含まれる非プロトン系極性溶剤が多くなるの
で、接触時間は長くする必要がある。In the step of depositing the polyimide precursor, the amount of the aprotic polar solvent released from the polyimide precursor coating varies depending on the time during which the polyimide precursor coating is brought into contact with the second solvent. If the aprotic polar solvent completely disappears from the polyimide precursor coating, the precipitated and solidified polyimide precursor coating may become brittle, and a small amount of the aprotic polar solvent remains. Is preferred. Therefore, the contact time of the polyimide precursor coating film with the second solvent depends on the type of the aprotic polar solvent and the thickness of the polyimide precursor coating film, but is preferably about 10 seconds to 10 minutes. In addition, since the aprotic polar solvent contained increases as the thickness of the polyimide precursor coating increases, the contact time needs to be increased.
【００４３】ポリイミド前駆体析出工程において、第二
の溶剤としては、水、アルコール類（例えばメタノー
ル、エタノール等）、炭化水素類（例えばヘキサン、ヘ
プタン、等）、ケトン類（例えばアセトン、ブタノン
等）、エステル類（例えば酢酸エチル等）、が挙げられ
る。これらの中も、水が最も扱いが簡便で好ましい。第
二の溶剤が水である場合、第二の溶剤と接触させた後
（接触を浸漬にて行った場合、引き離した後）、ポリイ
ミド前駆体被膜表面に水滴が付着していることもある。
その際は、該水滴を拭き取りにより除去してもよいし、
アルコール類やアセトン等の速乾性で水と混和する溶剤
にポリイミド前駆体被膜をさっと浸漬して除去してもよ
い。In the polyimide precursor deposition step, the second solvent may be water, alcohols (eg, methanol, ethanol, etc.), hydrocarbons (eg, hexane, heptane, etc.), ketones (eg, acetone, butanone, etc.). And esters (for example, ethyl acetate and the like). Among these, water is the most convenient and preferred. When the second solvent is water, water droplets may adhere to the surface of the polyimide precursor coating after being brought into contact with the second solvent (when the contact is performed by immersion, after separation).
In that case, the water droplets may be removed by wiping,
The polyimide precursor coating may be quickly removed by dipping in a solvent that is quick-drying and miscible with water, such as alcohols and acetone.
【００４４】−ポリイミド樹脂被膜形成工程− ポリイミド樹脂被膜形成工程においては、まず溶剤の乾
燥を行う。乾燥は、残留する非プロトン系極性溶剤と、
第二の溶剤に接触させた場合はポリイミド前駆体被膜中
に浸透した第二の溶剤とを除去する目的で行う。次い
で、１００〜２００℃の温度で、３０〜１２０分間残留
溶剤を完全に除去することが好ましい。この乾燥は、温
度を段階的に上昇させたり、一定速度で上昇させてもよ
い。なお、第二の溶剤に接触させた場合、第二の溶剤と
非プロトン系極性溶剤とでは、非プロトン系極性溶剤の
方が蒸発しにくいので、ポリイミド前駆体被膜中には第
二の溶剤がなくなって非プロトン系極性溶剤が残留した
状態が形成される。この状態になることにより、析出し
たポリイミド前駆体が再び溶解状態になり、透明化され
る。-Polyimide Resin Film Forming Step- In the polyimide resin film forming step, first, the solvent is dried. Drying, with the remaining aprotic polar solvent,
When it is brought into contact with the second solvent, it is performed for the purpose of removing the second solvent that has penetrated into the polyimide precursor coating. Next, it is preferable to completely remove the residual solvent at a temperature of 100 to 200 ° C. for 30 to 120 minutes. In this drying, the temperature may be increased stepwise or at a constant rate. When the second solvent and the aprotic polar solvent are in contact with each other, the aprotic polar solvent is more difficult to evaporate, so the second solvent is contained in the polyimide precursor coating. A state in which the aprotic polar solvent remains and disappears is formed. In this state, the precipitated polyimide precursor is again in a dissolved state and is transparent.
【００４５】ポリイミド樹脂被膜形成工程において、前
記乾燥後、３５０℃前後（好ましくは３５０〜４５０
℃）の温度で、２０〜６０分間ポリイミド前駆体被膜を
加熱硬化させることで、ポリイミド樹脂被膜を形成す
る。In the step of forming the polyimide resin film, after the drying, about 350 ° C. (preferably 350 to 450 ° C.)
(C) by heating and curing the polyimide precursor coating for 20 to 60 minutes to form a polyimide resin coating.
【００４６】以上の工程を経て、最後にポリイミド樹脂
被膜を芯体から外して継ぎ目なしベルトを得る。なお、
上述した形成方法（例えば浸漬方法や溶剤の乾燥の方法
（第二の溶剤を用いる方法）等）は、ポリイミド樹脂被
膜の形成に限らず、他の樹脂被膜形成に適用することが
できる。After the above steps, the polyimide resin film is finally removed from the core to obtain a seamless belt. In addition,
The above-described forming method (for example, a dipping method or a method for drying a solvent (a method using a second solvent) or the like) is not limited to forming a polyimide resin film, and can be applied to forming another resin film.
【００４７】本発明の継ぎ目なしベルトの製造方法によ
り得られるポリイミド樹脂被膜は、半導体等の分野おけ
る種々の絶縁材、後述するような、電子写真複写機やレ
ーザープリンタ等の画像形成装置における感光体、帯電
体（転写体等）、定着体等の継ぎ目なしベルト等に利用
することができる。それらの厚さとしては５〜５００μ
ｍの範囲であることが好ましい。より好ましくは１０〜
３００の厚さである。継ぎ目なしベルトには、更に必要
に応じて端部のスリット加工、パンチング穴あけ加工、
テープ巻き付け加工等が施されることもある。The polyimide resin film obtained by the method for producing a seamless belt according to the present invention can be used for various insulating materials in the field of semiconductors and the like, and for a photosensitive member in an image forming apparatus such as an electrophotographic copying machine or a laser printer as described later. And a seamless belt such as a charged member (transfer member) and a fixing member. 5 to 500μ as their thickness
It is preferably in the range of m. More preferably, 10
300 thickness. For seamless belts, if necessary, slit the ends, punch holes,
A tape winding process or the like may be performed.
【００４８】継ぎ目なしベルトを転写ベルトや接触帯電
フィルムのような帯電体として使用する場合には、樹脂
材料の中に導電性粒子を分散させる。導電性粒子として
は、例えば、カーボンブラック、カーボンブラックを造
粒したカーボンビーズ、カーボンファイバー、グラファ
イト等の炭素系物質、銅、銀、アルミニウム等の金属又
は合金、酸化錫、酸化インジウム、酸化アンチモン、Ｓ
ｎＯ2−Ｉｎ2Ｏ3複合酸化物等の導電性金属酸化物、チ
タン酸カリウム等の導電性ウィスカー等が挙げられる。When a seamless belt is used as a charging member such as a transfer belt or a contact charging film, conductive particles are dispersed in a resin material. Examples of the conductive particles include, for example, carbon black, carbon beads obtained by granulating carbon black, carbon fiber, a carbon-based substance such as graphite, a metal or alloy such as copper, silver, and aluminum, tin oxide, indium oxide, and antimony oxide. S
Examples include conductive metal oxides such as nO 2 —In 2 O 3 composite oxide, and conductive whiskers such as potassium titanate.
【００４９】継ぎ目なしベルトを定着体として使用する
場合には、表面に付着するトナーの剥離性の向上のた
め、ベルト表面に離型性の樹脂被膜を形成することが有
効である。その離型性の樹脂被膜の材料としては、ポリ
テトラフルオロエチレン（ＰＴＦＥ）、テトラフルオロ
エチレン−パーフルオロアルキルビニルエーテル共重合
体（ＰＦＡ）、テトラフルオロエチレン−ヘキサフルオ
ロプロピレン共重合体（ＦＥＰ）等のフッ素樹脂が好ま
しい。フッ素樹脂被膜の厚さは２〜３０μｍの範囲が好
ましい。また、離型性の樹脂被膜には、耐久性や静電オ
フセットの向上のためにカーボン粉末が分散されていて
もよい。When a seamless belt is used as a fixing member, it is effective to form a releasable resin film on the belt surface in order to improve the releasability of toner adhering to the surface. Examples of the material for the releasable resin film include polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (PFA), and tetrafluoroethylene-hexafluoropropylene copolymer (FEP). Fluororesins are preferred. The thickness of the fluororesin coating is preferably in the range of 2 to 30 μm. Further, carbon powder may be dispersed in the releasable resin film in order to improve durability and electrostatic offset.
【００５０】これらフッ素樹脂被膜を形成するには、そ
の水分散液を継ぎ目なしベルトの表面に塗布して焼き付
け処理する方法が好ましい。また、フッ素樹脂被膜の密
着性が不足する場合には、必要に応じて、ベルト表面に
プライマー層をあらかじめ塗布形成する方法がある。プ
ライマー層の材料としては、ポリフェニレンサルファイ
ド、ポリエーテルスルホン、ポリスルホン、ポリアミド
イミド、ポリイミド及びこれらの誘導体が挙げられ、さ
らにフッ素樹脂から選ばれる少なくとも一つの化合物を
含むことが好ましい。プライマー層の厚さは０．５〜１
０μｍの範囲が好ましい。In order to form these fluororesin coatings, it is preferable to apply the aqueous dispersion to the surface of the seamless belt and bake it. If the adhesion of the fluororesin film is insufficient, there is a method in which a primer layer is applied in advance to the belt surface as necessary. Examples of the material of the primer layer include polyphenylene sulfide, polyether sulfone, polysulfone, polyamide imide, polyimide, and derivatives thereof, and it is preferable that the primer layer further contains at least one compound selected from fluororesins. The thickness of the primer layer is 0.5 to 1
A range of 0 μm is preferred.
【００５１】ベルト上にプライマー層、及びフッ素樹脂
被膜を形成するには、加熱硬化してポリイミド樹脂被膜
（ベルト）を芯体の表面に形成してから、これらを塗布
形成してもよいが、ポリイミド前駆体溶液を塗布し、必
要に応じて第二の溶剤に接触させた後、溶剤を乾燥させ
てから、または、溶剤を乾燥させないまま、プライマー
層、及びフッ素樹脂分散液を塗布し、その後に加熱して
イミド転化完結反応とフッ素樹脂被膜の焼成処理を同時
に行ってもよい。その場合、プライマー層がなくてもフ
ッ素樹脂被膜の密着性が強固になることもある。In order to form a primer layer and a fluororesin coating on the belt, a polyimide resin coating (belt) may be formed by heating and curing on the surface of the core, and then these may be coated and formed. After applying the polyimide precursor solution and contacting it with the second solvent as necessary, after drying the solvent, or without drying the solvent, apply a primer layer, and a fluororesin dispersion, and then To complete the imide conversion completion reaction and the calcination treatment of the fluororesin film. In such a case, even without the primer layer, the adhesion of the fluororesin coating may become strong.
【００５２】（継ぎ目なしベルト）本発明の継ぎ目なし
ベルトは、前記本発明の継ぎ目なしベルトの製造方法に
より得られるものである。本発明の継ぎ目なしベルト
は、前記本発明の継ぎ目なしベルトの製造方法における
芯体表面の表面粗さを制御することで、表面と裏面との
表面粗さが異なるベルトとなる。(Seamless Belt) The seamless belt of the present invention is obtained by the method for producing a seamless belt of the present invention. The seamless belt of the present invention is a belt having different surface roughness between the front surface and the back surface by controlling the surface roughness of the core body surface in the method for producing a seamless belt of the present invention.
【００５３】本発明の継ぎ目なしベルトは、電子写真機
器等の画像形成装置における感光体ベルト、定着ベル
ト、転写ベルト等、様々な分野におけるベルトとして好
適に利用することができる。The seamless belt of the present invention can be suitably used as a belt in various fields such as a photosensitive belt, a fixing belt, and a transfer belt in an image forming apparatus such as an electrophotographic apparatus.
【００５４】[0054]
【実施例】以下、本発明を、実施例を挙げてさらに具体
的に説明する。ただし、これら各実施例は、本発明を制
限するものではない。EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, these embodiments do not limit the present invention.
【００５５】（実施例１） ―継ぎ目なしベルトの作製― 図３に示す浸漬塗布装置で浸漬塗布を行った。詳しくは
以下に示す。ポリイミド前駆体であるＮ−メチルピロリ
ドン溶液（商品名：Ｕワニス、宇部興産（株）製）を用
意した。固形分濃度は１８％で粘度は約５Ｐａ・ｓであ
った。これを内径８０ｍｍ、高さ５００ｍｍの円筒容器
に入れた。(Example 1) -Preparation of seamless belt- Dip coating was performed by a dip coating device shown in FIG. Details are shown below. An N-methylpyrrolidone solution (trade name: U Varnish, manufactured by Ube Industries, Ltd.) as a polyimide precursor was prepared. The solid concentration was 18% and the viscosity was about 5 Pa · s. This was placed in a cylindrical container having an inner diameter of 80 mm and a height of 500 mm.
【００５６】芯体として、外径３０ｍｍ、長さ４００ｍ
ｍのアルミ製円筒表面を、サンドブラストにてＲａ０．
５μｍに粗面化したものを用意した。その表面にはシリ
コーン系離型剤（商品名：ＫＳ７００、信越化学（株）
製）を塗布して、３００℃で１時間、焼き付け処理し
た。As a core, an outer diameter of 30 mm and a length of 400 m
m of the aluminum cylindrical surface is sandblasted with Ra0.
A surface roughened to 5 μm was prepared. A silicone release agent (trade name: KS700, Shin-Etsu Chemical Co., Ltd.)
Was applied and baked at 300 ° C. for 1 hour.
【００５７】一方、フロートとして、外径６５ｍｍ、内
径４０ｍｍ、高さ３０ｍｍのステンレス製の中空状のリ
ングを作製し、この内側に、外径が４０ｍｍで断面が三
角形で、最も狭い部分の内径が３１．３ｍｍのテフロン
製リングを嵌合させたもの（図５（ｂ）参照）を用意し
た。On the other hand, as a float, a stainless steel hollow ring having an outer diameter of 65 mm, an inner diameter of 40 mm, and a height of 30 mm was prepared. Inside this ring, the outer diameter was 40 mm, the cross section was triangular, and the inner diameter of the narrowest part was The one fitted with a 31.3 mm Teflon ring (see FIG. 5B) was prepared.
【００５８】フロートを上記溶液に浮かべた後、フロー
トを動かないよう固定し、芯体を長手方向を垂直にして
その中に５００ｍｍ／ｍｉｎの速度で挿入し、溶液に浸
漬した。次いでフロートの固定を解除し、１５０ｍｍ／
ｍｉｎの速度で芯体を引き上げた。溶液の粘度が高いの
で、引き上げ途中ではフロートが芯体に接触することは
なく、芯体には濡れ膜厚が約６５０μｍのポリイミド前
駆体塗膜が形成された。After the float was floated on the above solution, the float was fixed so as not to move, and the core was inserted vertically into the solution at a speed of 500 mm / min and immersed in the solution. Next, the float was released, and 150 mm /
The core was pulled up at a speed of min. Since the viscosity of the solution was high, the float did not come into contact with the core during the lifting, and a polyimide precursor coating film having a wet film thickness of about 650 μm was formed on the core.
【００５９】芯体を引き上げた後、すぐに水中に浸漬
し、６分間放置した。芯体を引き上げると、ポリイミド
前駆体は黄白色の析出物となって芯体上にポリイミド前
駆体被膜が形成されていた。表面の水滴を拭き取り、次
いで上記芯体を乾燥炉に入れた。設定温度は最初が３０
℃で、１時間後に１００℃になるよう、徐々に温度が上
昇するようにした。この乾燥後、被膜は透明化した。さ
らに１５０℃で２０分間、２００℃で２０分間加熱乾燥
させ、Ｎ−メチルピロリドンと水を完全に除去した。After the core was pulled out, it was immediately immersed in water and left for 6 minutes. When the core was pulled up, the polyimide precursor became a yellow-white precipitate, and a polyimide precursor coating was formed on the core. Water droplets on the surface were wiped off, and then the core was placed in a drying oven. Set temperature is initially 30
The temperature was gradually increased to 100 ° C. after 1 hour at 100 ° C. After this drying, the coating became transparent. Further, it was dried by heating at 150 ° C. for 20 minutes and at 200 ° C. for 20 minutes to completely remove N-methylpyrrolidone and water.
【００６０】その後、３５０℃で３０分間加熱してポリ
イミド前駆体被膜を硬化させ、ポリイミド樹脂被膜を形
成した。室温に冷えてから被膜を取り外すことにより、
７０μｍ厚の均一で、膨れの無いポリイミド樹脂製継ぎ
目なしベルトを得ることができた。芯体表面には離型剤
を塗布してあるので、ポリイミド樹脂が接着することは
なかった。このときのベルト粗さは、表面のＲａが０．
０５μｍ、裏面のＲａが０．４５μｍとなっており、表
面と裏面の粗さが異なる継ぎ目なしベルトを得ることが
できた。Thereafter, the polyimide precursor film was cured by heating at 350 ° C. for 30 minutes to form a polyimide resin film. By cooling down to room temperature and removing the coating,
A polyimide resin seamless belt having a thickness of 70 μm and having no swelling was obtained. Since the release agent was applied to the surface of the core body, the polyimide resin did not adhere. The belt roughness at this time was such that Ra on the surface was 0.1.
05 μm and Ra of the back surface were 0.45 μm, and a seamless belt with different roughness on the front and back surfaces could be obtained.
【００６１】−評価− 得られた継ぎ目なしベルトについて、次の示す評価を行
った。結果を表１に示す。 ・目視にてベルトの外径膨れについて調べた。評価基準
は以下の通りである。 ○：膨れ発生無し △：若干の膨れ有り（性能上問題ないレベル） ×：大きな膨れ有り ・表面凹凸（ベルト裏面の表面粗さＲａ）について、Ｊ
ＩＳ Ｂ０６０１−１９９４（評価長さＬｎ＝４ｍｍ、
基準長さＬ＝０．８ｍｍ、カットオフ値＝０．８ｍｍ）
に準拠し調べた。評価基準は以下の通りである ○：Ｒａ０．３μｍ以下の表面 △：Ｒａ０．３〜３．０μｍの表面、若干突起有り（性
能上問題ないレベル） ×：Ｒａ３．０μｍ以上、大きな突起有り-Evaluation- The following evaluation was performed on the obtained seamless belt. Table 1 shows the results. -The outer diameter swelling of the belt was visually inspected. The evaluation criteria are as follows. ：: No swelling occurred. ：: Slight swelling occurred (level at which there is no problem in performance). X: Large swelling was observed.
IS B0601-1994 (evaluation length Ln = 4 mm,
(Standard length L = 0.8 mm, cut-off value = 0.8 mm)
I checked according to. The evaluation criteria are as follows: ○: Surface with Ra of 0.3 μm or less Δ: Surface with Ra of 0.3 to 3.0 μm, with some protrusions (level at which there is no problem in performance) ×: Ra with a size of 3.0 μm or more, with large protrusions
【００６２】（実施例２）芯体として、外径３０ｍｍ、
長さ５００ｍｍのアルミ製円筒表面を、サンドブラスト
にてＲａ１．５μｍに粗面化したものを用意した以外
は、実施例１と同様にして、ポリイミド製の継ぎ目なし
ベルトを得て、評価した。結果を表１に示す。(Example 2) As a core, an outer diameter of 30 mm,
A seamless belt made of polyimide was obtained and evaluated in the same manner as in Example 1, except that a surface of an aluminum cylinder having a length of 500 mm was roughened to Ra 1.5 μm by sandblasting. Table 1 shows the results.
【００６３】（実施例３）芯体として、外径３０ｍｍ、
長さ５００ｍｍのアルミ製円筒表面を、サンドブラスト
にてＲａ０．１μｍに粗面化したものを用意した以外
は、実施例１と同様にして、ポリイミド製の継ぎ目なし
ベルトを得て、評価した。結果を表１に示す。(Example 3) As a core, an outer diameter of 30 mm,
A seamless belt made of polyimide was obtained and evaluated in the same manner as in Example 1, except that a surface of an aluminum cylindrical member having a length of 500 mm was roughened to Ra 0.1 μm by sandblasting. Table 1 shows the results.
【００６４】（実施例４）芯体として、外径３０ｍｍ、
長さ５００ｍｍのアルミ製円筒表面を、サンドブラスト
にてＲａ３．０μｍに粗面化したものを用意した以外
は、実施例１と同様にして、ポリイミド製の継ぎ目なし
ベルトを得て、評価した。結果を表１に示す。(Example 4) As a core, an outer diameter of 30 mm,
A seamless belt made of polyimide was obtained and evaluated in the same manner as in Example 1 except that a surface of an aluminum cylindrical member having a length of 500 mm was roughened to Ra 3.0 μm by sandblasting. Table 1 shows the results.
【００６５】[0065]
【表１】 [Table 1]
【００６６】（実施例５）芯体として、外径３０ｍｍ、
長さ５００ｍｍのアルミ製円筒表面を、サンドブラスト
にてＲａ０．５μｍに粗面化したものを用意し、最も狭
い部分の径が３０．９ｍｍである以外は実施例１と同様
のフロートを用いて塗布を行った。塗布後の水浸時間は
４分間とし、実施例１と同様の焼成条件にてポリイミド
製の継ぎ目なしベルトを得て、評価した。結果を表２に
示す。(Example 5) An outer diameter of 30 mm was used as a core.
A 500 mm long aluminum cylindrical surface roughened to Ra 0.5 μm by sand blasting was prepared and applied using the same float as in Example 1 except that the diameter of the narrowest part was 30.9 mm. Was done. The water immersion time after the application was 4 minutes, and a seamless belt made of polyimide was obtained and evaluated under the same firing conditions as in Example 1. Table 2 shows the results.
【００６７】（比較例１）芯体として、外径３０ｍｍ、
長さ５００ｍｍ、粗面化していないアルミ製円筒（表面
粗さ０．０５）を用意した以外は、実施例５と同様にし
てポリイミド製の継ぎ目なしベルトを得て、評価した。
結果を表２に示す。(Comparative Example 1) An outer diameter of 30 mm
A seamless belt made of polyimide was obtained and evaluated in the same manner as in Example 5, except that an aluminum cylinder (surface roughness 0.05) having a length of 500 mm and not being roughened was prepared.
Table 2 shows the results.
【００６８】（実施例６）芯体として、外径３０ｍｍ、
長さ５００ｍｍのアルミ製円筒表面を、サンドブラスト
にてＲａ２．０μｍに粗面化したものを用意した以外
は、実施例５と同様にしてポリイミド製の継ぎ目なしベ
ルトを得て、評価した。結果を表２に示す。(Example 6) As a core, an outer diameter of 30 mm was used.
A seamless belt made of polyimide was obtained and evaluated in the same manner as in Example 5, except that a surface of an aluminum cylinder having a length of 500 mm was roughened to Ra 2.0 μm by sandblasting. Table 2 shows the results.
【００６９】[0069]
【表２】 [Table 2]
【００７０】（実施例７）芯体として、外径３０ｍｍ、
長さ５００ｍｍのアルミ製円筒表面を、サンドブラスト
にてＲａ０．５μｍに粗面化したものを用意し、最も狭
い部分の径が３０．６ｍｍである以外は実施例１と同様
のフロートを用いて塗布を行った。塗布後の水浸時間は
２分間とし、実施例１と同様の焼成条件にてポリイミド
製の継ぎ目なしベルトを得て、評価した。結果を表３に
示す。(Example 7) As a core, an outer diameter of 30 mm was used.
An aluminum cylindrical surface with a length of 500 mm was roughened to Ra 0.5 μm by sandblasting, and coated using the same float as in Example 1 except that the diameter of the narrowest part was 30.6 mm. Was done. The water immersion time after the application was 2 minutes, and a seamless belt made of polyimide was obtained and evaluated under the same firing conditions as in Example 1. Table 3 shows the results.
【００７１】（比較例２）芯体として、外径３０ｍｍ、
長さ５００ｍｍ、粗面化していないアルミ製円筒（表面
粗さＲａが０．０５μｍ）を用意した以外は、実施例７
と同様にしてポリイミド製の継ぎ目なしベルトを得て、
評価した。結果を表３に示す。(Comparative Example 2) The core had an outer diameter of 30 mm,
Example 7 except that a 500 mm long, non-roughened aluminum cylinder (surface roughness Ra of 0.05 μm) was prepared.
In the same manner as above, a seamless belt made of polyimide was obtained,
evaluated. Table 3 shows the results.
【００７２】（実施例８）芯体として、外径３０ｍｍ、
長さ５００ｍｍのアルミ製円筒表面を、サンドブラスト
にてＲａ２．０μｍに粗面化したものを用意した以外
は、実施例７と同様にしてポリイミド製の継ぎ目なしベ
ルトを得て、評価した。結果を表３に示す。Example 8 An outer diameter of 30 mm was used as a core.
A seamless belt made of polyimide was obtained and evaluated in the same manner as in Example 7, except that a surface of an aluminum cylinder having a length of 500 mm was roughened to Ra 2.0 μm by sandblasting. Table 3 shows the results.
【００７３】[0073]
【表３】 [Table 3]
【００７４】（実施例９）芯体として、外径３０ｍｍ、
長さ５００ｍｍのアルミ製円筒表面を、サンドブラスト
にてＲａ０．３μｍに粗面化したものを用意し、最も狭
い部分の径が３０．４５ｍｍである以外は実施例１と同
様のフロートを用いて塗布を行った。塗布後の水浸時間
は２分間とし、実施例１と同様の焼成条件にてポリイミ
ド製の継ぎ目なしベルトを得て、評価した。結果を表４
に示す。Example 9 An outer diameter of 30 mm was used as a core.
A 500 mm long aluminum cylindrical surface roughened to Ra 0.3 μm by sand blasting was prepared and applied using the same float as in Example 1 except that the diameter of the narrowest part was 30.45 mm. Was done. The water immersion time after the application was 2 minutes, and a seamless belt made of polyimide was obtained and evaluated under the same firing conditions as in Example 1. Table 4 shows the results
Shown in
【００７５】（実施例１０）芯体として、外径３０ｍ
ｍ、長さ５００ｍｍのアルミ製円筒表面を、サンドブラ
ストにてＲａ１．０μｍに粗面化したものを用意した以
外は、実施例９と同様にしてポリイミド製の継ぎ目なし
ベルトを得て、評価した。結果を表４に示す。(Example 10) An outer diameter of 30 m was used as a core.
A seamless belt made of polyimide was obtained and evaluated in the same manner as in Example 9, except that a surface of an aluminum cylinder having a length of 500 mm and a length of 500 mm was roughened to Ra 1.0 μm by sandblasting. Table 4 shows the results.
【００７６】[0076]
【表４】 [Table 4]
【００７７】（実施例１１）芯体として、外径３０ｍ
ｍ、長さ５００ｍｍのアルミ製円筒表面を、サンドブラ
ストにてＲａ０．３μｍに粗面化したものを用意し、最
も狭い部分の径が３０．２ｍｍである以外は実施例１と
同様のフロートを用いて塗布を行った。塗布後の水浸時
間は無しとし、実施例１と同様の焼成条件にてポリイミ
ド製の継ぎ目なしベルトを得て、評価した。結果を表５
に示す。(Example 11) An outer diameter of 30 m was used as a core body.
m, a surface of an aluminum cylinder having a length of 500 mm roughened to Ra 0.3 μm by sand blasting, and using the same float as in Example 1 except that the diameter of the narrowest part is 30.2 mm. Was applied. No water immersion time was applied after coating, and a seamless belt made of polyimide was obtained and evaluated under the same firing conditions as in Example 1. Table 5 shows the results
Shown in
【００７８】（実施例１２）芯体として、外径３０ｍ
ｍ、長さ５００ｍｍのアルミ製円筒表面を、サンドブラ
ストにてＲａ１．０μｍに粗面化したものを用意した以
外は、実施例１１と同様にしてポリイミド製の継ぎ目な
しベルトを得て、評価した。結果を表５に示す。(Example 12) An outer diameter of 30 m was used as a core body.
A seamless belt made of polyimide was obtained and evaluated in the same manner as in Example 11, except that an aluminum cylindrical surface having a length of 500 mm and a length of 500 mm was roughened to Ra 1.0 μm by sandblasting. Table 5 shows the results.
【００７９】[0079]
【表５】 [Table 5]
【００８０】（実施例１３）芯体として、外径３０ｍ
ｍ、長さ５００ｍｍのアルミ製円筒表面を、サンドブラ
ストにてＲａ０．８μｍに粗面化したものを用意し、最
も狭い部分の径が３１．６ｍｍである以外は実施例１と
同様のフロートを用いて塗布を行った。塗布後の水浸時
間７分間とし、実施例１と同様の焼成条件にてポリイミ
ド製の継ぎ目なしベルトを得て、評価した。結果を表６
に示す。(Example 13) As a core, an outer diameter of 30 m was used.
m, an aluminum cylindrical surface having a length of 500 mm was roughened to Ra 0.8 μm by sandblasting, and the same float as in Example 1 was used except that the diameter of the narrowest part was 31.6 mm. Was applied. Water immersion time after application was 7 minutes, and a polyimide seamless belt was obtained and evaluated under the same firing conditions as in Example 1. Table 6 shows the results
Shown in
【００８１】（実施例１４）芯体として、外径３０ｍ
ｍ、長さ５００ｍｍのアルミ製円筒表面を、サンドブラ
ストにてＲａ２．０μｍに粗面化したものを用意した以
外は、実施例１３と同様にしてポリイミド製の継ぎ目な
しベルトを得て、評価した。結果を表６に示す。(Example 14) An outer diameter of 30 m was used as a core body.
A seamless belt made of polyimide was obtained and evaluated in the same manner as in Example 13 except that an aluminum cylindrical surface having a length of 500 mm and a length of 500 mm was roughened to Ra 2.0 μm by sandblasting. Table 6 shows the results.
【００８２】（実施例１５）芯体として、外径３０ｍ
ｍ、長さ５００ｍｍのアルミ製円筒表面を、サンドブラ
ストにてＲａ０．１μｍに粗面化したものを用意した以
外は、実施例１３と同様にしてポリイミド製の継ぎ目な
しベルトを得て、評価した。結果を表６に示す。(Embodiment 15) The core has an outer diameter of 30 m.
A seamless belt made of polyimide was obtained and evaluated in the same manner as in Example 13 except that an aluminum cylindrical surface having a length of 500 mm and a length of 500 mm was roughened to Ra 0.1 μm by sandblasting. Table 6 shows the results.
【００８３】（実施例１６）芯体として、外径３０ｍ
ｍ、長さ５００ｍｍのアルミ製円筒表面を、サンドブラ
ストにてＲａ３．０μｍに粗面化したものを用意した以
外は、実施例１３と同様にしてポリイミド製の継ぎ目な
しベルトを得て、評価した。結果を表６に示す。(Example 16) An outer diameter of 30 m was used as a core body.
A seamless belt made of polyimide was obtained and evaluated in the same manner as in Example 13 except that a surface of an aluminum cylinder having a length of 500 mm and a length of 500 mm was roughened to Ra 3.0 μm by sandblasting. Table 6 shows the results.
【００８４】[0084]
【表６】 [Table 6]
【００８５】（実施例１７）芯体として、外径３０ｍ
ｍ、長さ５００ｍｍのアルミ製円筒表面を、サンドブラ
ストにてＲａ０．８μｍに粗面化したものを用意し、最
も狭い部分の径が３２．２ｍｍである以外は実施例１と
同様のフロートを用いて塗布を行った。塗布後の水浸時
間９分間とし、実施例１と同様の焼成条件にてポリイミ
ド製の継ぎ目なしベルトを得て、評価した。結果を表７
に示す。(Embodiment 17) The core has an outer diameter of 30 m.
m, a surface of an aluminum cylinder having a length of 500 mm roughened to Ra 0.8 μm by sandblasting, and a float similar to that of Example 1 was used except that the diameter of the narrowest portion was 32.2 mm. Was applied. The water immersion time after application was 9 minutes, and a polyimide seamless belt was obtained under the same baking conditions as in Example 1 and evaluated. Table 7 shows the results
Shown in
【００８６】（実施例１８）芯体として、外径３０ｍ
ｍ、長さ５００ｍｍのアルミ製円筒表面を、サンドブラ
ストにてＲａ２．０μｍに粗面化したものを用意した以
外は、実施例１７と同様にしてポリイミド製の継ぎ目な
しベルトを得て、評価した。結果を表７に示す。(Example 18) An outer diameter of 30 m was used as the core body.
A seamless belt made of polyimide was obtained and evaluated in the same manner as in Example 17, except that a surface of an aluminum cylinder having a length of 500 mm and a length of 500 mm was roughened to Ra 2.0 μm by sandblasting. Table 7 shows the results.
【００８７】（実施例１９）芯体として、外径３０ｍ
ｍ、長さ５００ｍｍのアルミ製円筒表面を、サンドブラ
ストにてＲａ０．１μｍに粗面化したものを用意した以
外は、実施例１７と同様にしてポリイミド製の継ぎ目な
しベルトを得て、評価した。結果を表７に示す。(Example 19) As a core, an outer diameter of 30 m was used.
A seamless belt made of polyimide was obtained and evaluated in the same manner as in Example 17, except that a surface of an aluminum cylinder having a length of 500 mm and a length of 500 mm was roughened to Ra 0.1 μm by sandblasting. Table 7 shows the results.
【００８８】（実施例２０）芯体として、外径３０ｍ
ｍ、長さ５００ｍｍのアルミ製円筒表面を、サンドブラ
ストにてＲａ３．０μｍに粗面化したものを用意した以
外は、実施例１７と同様にしてポリイミド製の継ぎ目な
しベルトを得て、評価した。結果を表７に示す。(Example 20) An outer diameter of 30 m was used as a core body.
A seamless belt made of polyimide was obtained and evaluated in the same manner as in Example 17 except that an aluminum cylindrical surface having a length of 500 mm and a length of 500 mm was roughened to Ra 3.0 μm by sandblasting. Table 7 shows the results.
【００８９】[0089]
【表７】 [Table 7]
【００９０】（実施例２１）芯体として、外径３０ｍ
ｍ、長さ４００ｍｍのアルミニウム製円筒表面に、直径
０．２ｍｍの穴を所定の間隔で複数個設けたものを使用
した以外は、実施例１と同様にして、ポリイミド製の継
ぎ目なしベルトを得た。この芯体を用いて得られた継ぎ
目なしベルトは膨れの発生は無く、膜厚も均一であっ
た。このときのベルト粗さは表面のＲａが０．０３μ
ｍ、裏面のＲａが０．０５μｍであった。(Example 21) As a core, an outer diameter of 30 m
m, a polyimide seamless belt was obtained in the same manner as in Example 1 except that a plurality of holes each having a diameter of 0.2 mm were provided at predetermined intervals on an aluminum cylindrical surface having a length of 400 mm. Was. The seamless belt obtained using this core had no swelling and a uniform film thickness. At this time, the surface roughness Ra was 0.03 μm.
m, Ra of the back surface was 0.05 μm.
【００９１】（実施例２２）芯体として、外径３０ｍ
ｍ、長さ４００ｍｍのアルミニウム製円筒表面に、直径
１．２ｍｍの穴を所定の間隔で複数個設けたものを使用
した以外は、実施例１と同様にして、ポリイミド製の継
ぎ目なしベルトを得た。この芯体を用いて得られた継ぎ
目なしベルトは膨れの発生はなく、外径の均一性はよか
ったが、ベルト裏面において、塗液が芯体表面にあけた
穴に進入してできたと考えられる突起が僅かながら発生
していた。Example 22 The core had an outer diameter of 30 m.
m, a polyimide seamless belt was obtained in the same manner as in Example 1 except that a plurality of holes each having a diameter of 1.2 mm were provided at predetermined intervals on an aluminum cylindrical surface having a length of 400 mm. Was. The seamless belt obtained using this core had no swelling and uniform outer diameter was good, but it is considered that the coating liquid entered the holes formed in the surface of the core on the back surface of the belt. The projection was slightly generated.
【００９２】（実施例２３）実施例１において、ポリイ
ミド前駆体被膜が透明化した状態で室温に冷却した。こ
の表面に、ＰＦＡのディスパージョン水性塗料（商品
名：ＡＤ−２ＣＲ、ダイキン工業（株）製）を浸漬塗布
した。すなわち、芯体をその長手方向を垂直にして塗料
中に浸漬し、次いで３００ｍｍ／ｍｉｎの速度で引き上
げ、２０μｍ厚のＰＦＡ塗膜を形成した。(Example 23) In Example 1, the polyimide precursor film was cooled to room temperature in a state where it was transparent. An aqueous dispersion of PFA (AD-2CR, manufactured by Daikin Industries, Ltd.) was dip-coated on this surface. That is, the core body was immersed in the paint with its longitudinal direction vertical, and then pulled up at a speed of 300 mm / min to form a PFA coating film having a thickness of 20 μm.
【００９３】続いて室温で５分間の乾燥後、１００℃で
１０分間、１５０℃で２０分間、２００℃で２０分間加
熱乾燥させた。これにより、ポリイミド前駆体被膜から
はＮ−メチルピロリドンと水が除去され、ＰＦＡ塗膜か
らは水が除去された。Subsequently, after drying at room temperature for 5 minutes, it was dried by heating at 100 ° C. for 10 minutes, 150 ° C. for 20 minutes, and 200 ° C. for 20 minutes. Thereby, N-methylpyrrolidone and water were removed from the polyimide precursor coating, and water was removed from the PFA coating.
【００９４】その後、３８０℃で３０分間加熱してポリ
イミド前駆体被膜を硬化させ、ポリイミド樹脂被膜を形
成すると共に、ＰＦＡ塗膜を焼成した。室温に冷えてか
ら被膜を取り外すことにより、７０μｍ厚のポリイミド
樹脂製の継ぎ目なしベルト上に、２０μｍ厚のＰＦＡ層
を有する電子写真用定着ベルトを得ることができた。ポ
リイミド樹脂とＰＦＡ層の密着性は十分であった。Then, the polyimide precursor film was cured by heating at 380 ° C. for 30 minutes to form a polyimide resin film, and the PFA film was baked. By removing the film after cooling to room temperature, a fixing belt for electrophotography having a PFA layer having a thickness of 20 μm on a seamless belt made of a polyimide resin having a thickness of 70 μm was obtained. The adhesion between the polyimide resin and the PFA layer was sufficient.
【００９５】（実施例２４）実施例１のポリイミド前駆
体溶液に、カーボンブラック（商品名：Ｃｏｎｄｕｃｔ
ｅｘ９７５、コロンビヤンカーボン社製）を固形分重量
比１３％で混合し、次いでボールミルにより２４時間分
散し、粘度が約１０Ｐａ・ｓの塗料を得た。(Example 24) Carbon black (trade name: Conduct) was added to the polyimide precursor solution of Example 1.
ex975, manufactured by Colombian Carbon Co., Ltd.) at a solid content of 13% by weight and then dispersed by a ball mill for 24 hours to obtain a paint having a viscosity of about 10 Pa · s.
【００９６】芯体として、サンドブラストにより表面粗
さＲａ１．０μｍとした、外径１６０ｍｍ、長さ５００
ｍｍのアルミニウム製円筒を用意し、その表面は実施例
１と同じくシリコーン系離型剤の処理をした。フロート
として、外径２００ｍｍ、内径１８０ｍｍ、高さ３０ｍ
ｍのステンレス製の中空状のリングを作製し、この内側
に、外径が１８０ｍｍで断面が三角形で、最も狭い部分
の内径が１６１．２ｍｍのテフロン製リングを嵌合させ
たものを用意した。上記の他は実施例１と同様にして、
フロートを用いて芯体表面に浸漬塗布を行い、水中に５
分間浸漬した後、乾燥処理と加熱硬化を行った。The core body was sandblasted to have a surface roughness Ra of 1.0 μm, an outer diameter of 160 mm, and a length of 500 mm.
An aluminum cylinder having a thickness of 1 mm was prepared, and the surface thereof was treated with a silicone release agent as in Example 1. As a float, outer diameter 200mm, inner diameter 180mm, height 30m
m, a Teflon ring having an outer diameter of 180 mm, a triangular cross-section, and an inner diameter of 161.2 mm at the narrowest part was fitted inside the hollow ring made of stainless steel. Other than the above, in the same manner as in the first embodiment,
Using a float, dip coating is performed on the surface of the core body.
After soaking for a minute, a drying treatment and heat curing were performed.
【００９７】室温に冷えてからポリイミド樹脂被膜を取
り外すことにより、８０μｍ厚の膨れのない、均一なポ
リイミド樹脂製の継ぎ目なしベルトを得ることができ
た。体積抵抗率を測定すると、約１０9Ω・ｃｍであ
り、ベルト粗さは表面のＲａが０．０６μｍ、裏面のＲ
ａが０．６７μｍであった。このベルトを転写ベルトと
して使用したところ、表面のＲａが小さいので、トナー
像に乱れのない転写画像を得ることができた。また、ベ
ルトの裏面のＲａが大きいので、駆動ロールからの駆動
力はスリップ無くスムーズに伝達されることができた。By removing the polyimide resin film after cooling to room temperature, a uniform polyimide resin seamless belt having a thickness of 80 μm without swelling was obtained. When the volume resistivity was measured, it was about 10 9 Ω · cm, and the belt roughness was 0.06 μm for Ra on the front side and R
a was 0.67 μm. When this belt was used as a transfer belt, it was possible to obtain a transfer image without disturbance in the toner image because the surface Ra was small. Also, since the Ra on the back surface of the belt was large, the driving force from the driving roll could be smoothly transmitted without slip.
【００９８】（実施例２５）ポリアミドイミド製継ぎ目
なしベルトを作製するために、ポリアミドイミド溶液
（商品名：バイロマックスＮ８０２０、東洋紡（株）
製）を用意した。固形分濃度は１３％で粘度は約２０Ｐ
ａ・ｓであった。これを内径８０ｍｍ、高さ５００ｍｍ
の円筒容器に入れた。Example 25 A polyamide-imide solution (trade name: Viromax N8020, manufactured by Toyobo Co., Ltd.) was used to produce a seamless belt made of polyamide-imide.
Made). Solid content concentration is 13% and viscosity is about 20P
a · s. 80mm inside diameter, 500mm height
In a cylindrical container.
【００９９】芯体として、外径３０ｍｍ、長さ５００ｍ
ｍのアルミ製円筒表面を、サンドブラストにてＲａ１．
０μｍに粗面化したものを用意し、その表面は実施例１
と同じくシリコーン系離型剤の処理をした。フロートと
しては、外径６５ｍｍ、内径４０ｍｍ、高さ３０ｍｍの
ステンレス製の中空状のリングを作製し、この内側に、
外径が４０ｍｍで断面が三角形で、最も狭い部分の内径
が３１．６ｍｍのテフロン製リングを嵌合させたもの
（図５（ｂ）参照）を用意した。上記の他は実施例１と
同様にして、フロートを用いて芯体表面に浸漬塗布を行
い、水中に３分間浸漬した後、加熱乾燥処理を行った。As the core, the outer diameter is 30 mm and the length is 500 m
m of aluminum cylindrical surface is sandblasted to Ra1.
A surface roughened to 0 μm was prepared.
And treated with a silicone release agent. As a float, a stainless steel hollow ring having an outer diameter of 65 mm, an inner diameter of 40 mm, and a height of 30 mm was prepared, and inside this ring,
A Teflon ring having an outer diameter of 40 mm, a triangular cross section, and an inner diameter of the narrowest portion of 31.6 mm was fitted (see FIG. 5B). Except for the above, in the same manner as in Example 1, dip coating was performed on the surface of the core body using a float, immersed in water for 3 minutes, and then heated and dried.
【０１００】室温に冷えてからポリアミドイミド樹脂被
膜を取り外すことにより、７０μｍ厚の膨れのない、均
一なポリアミドイミド樹脂製の継ぎ目なしベルトを得る
ことができた。ベルト粗さを測定したところ、ベルト表
面粗さＲａが０．０３μｍ、ベルト裏面粗さＲａが０．
７１μｍであった。By removing the polyamide-imide resin film after cooling to room temperature, a 70 μm-thick, uniform and seamless polyamide-imide resin belt could be obtained. When the belt roughness was measured, the belt surface roughness Ra was 0.03 μm, and the belt back surface roughness Ra was 0.5 μm.
It was 71 μm.
【０１０１】実施例１〜２５、及び比較例１〜２から、
表面を粗面化または表面に穴を設けた金属芯体を用いる
ことで、樹脂被膜焼成時に発生するガスを効果的に逃が
すことができるので、外径、膜厚が均一である樹脂製の
継ぎ目なしベルトを容易に製造できることがわかる。ま
た、本発明による粗面化した芯体を用いることにより、
表面と裏面の粗さが異なり、機能上優れた継ぎ目なしベ
ルトを容易に製造できることがわかる。From Examples 1 to 25 and Comparative Examples 1 and 2,
By using a metal core with a roughened surface or a hole in the surface, the gas generated during baking of the resin film can be effectively released, so that a resin seam with a uniform outer diameter and film thickness can be used. It can be seen that a belt without a belt can be easily manufactured. Also, by using the roughened core body according to the present invention,
It can be seen that the roughness of the front and back surfaces is different, and that a seamless seamless belt excellent in function can be easily manufactured.
【０１０２】[0102]
【発明の効果】以上により、本発明によれば、樹脂の被
膜を形成するに際して、加熱硬化時に膨張しようとする
ガスを効果的に逃がすことで、均一な樹脂被膜を得るこ
とができる被膜形成方法、並びに、継ぎ目なしベルト及
び継ぎ目なしベルトの製造方法を提供することができ
る。As described above, according to the present invention, when a resin film is formed, a gas which tends to expand during heating and curing is effectively released, whereby a uniform resin film can be obtained. , And a seamless belt and a method for manufacturing the seamless belt.
【図１】粗面化された基体（芯体）の一例を示す図であ
るFIG. 1 is a diagram showing an example of a roughened substrate (core).
【図２】表面に穴を設けた基体（芯体）の一例を示す図
であるFIG. 2 is a diagram showing an example of a base (core body) having a surface provided with holes.
【図３】フロートにより膜厚を制御する浸漬塗布方法に
用いる塗布装置の一例を示す概略構成図である。FIG. 3 is a schematic configuration diagram illustrating an example of a coating apparatus used for a dip coating method of controlling a film thickness by a float.
【図４】フロートの概略斜視図である。FIG. 4 is a schematic perspective view of a float.
【図５】（ａ）フロートの別の一例を示す概略断面図で
ある。（ｂ）フロートの別の一例を示す概略断面図であ
る。FIG. 5A is a schematic sectional view showing another example of the float. (B) It is an outline sectional view showing another example of a float.
【図６】ポリイミド前駆体塗膜を第二の溶剤に浸漬する
方法を説明する概要図である。FIG. 6 is a schematic diagram illustrating a method of dipping a polyimide precursor coating film in a second solvent.
１、９ 芯体（基体） ２ ポリイミド前駆体溶液 ３ 塗布槽 ４ ポリイミド前駆体塗膜 ５ フロート ６ フロートの孔 ７ 傾斜した直線状のフロート内壁 ８ 上端より下に最も狭い部分を有するフロートの内壁 １０ ポリイミド前駆体被膜 １１ 第二の溶剤 １２ 容器 １３ 粗面化された芯体表面 １４ 穴 1, 9 core (substrate) 2 polyimide precursor solution 3 coating tank 4 polyimide precursor coating 5 float 6 float hole 7 inclined straight float inner wall 8 float inner wall having narrowest part below upper end 10 Polyimide precursor coating 11 Second solvent 12 Container 13 Surface of roughened core 14 Hole
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｇ０３Ｇ 15/16 Ｇ０３Ｇ 15/16 15/20 １０２ 15/20 １０２ 21/00 ３５０ 21/00 ３５０ // Ｂ２９Ｌ 29:00 Ｂ２９Ｌ 29:00 (72)発明者 矢敷 雄一 神奈川県南足柄市竹松1600番地 富士ゼロ ックス株式会社内 Ｆターム(参考） 2H003 BB11 CC04 2H033 AA31 BA11 BA12 2H035 CA05 CB06 4D075 AB03 AB36 BB02X BB26Z CA18 DA10 DA15 DA20 DB04 DB06 DB07 DB39 DB54 DC18 DC21 DC24 EA07 EA31 EB19 EB22 EB35 EB39 EB44 4F205 AA40 AC05 AG16 GA06 GB01 GC01 GF03 GF24 GN13 GN29 GW06 Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat II (reference) G03G 15/16 G03G 15/16 15/20 102 15/20 102 21/00 350 21/00 350 // B29L 29:00 B29L 29:00 (72) Inventor Yuichi Yashiki 1600 Takematsu, Minamiashigara-shi, Kanagawa Prefecture Fuji Xerox Co., Ltd.F-term (reference) 2H003 BB11 CC04 2H033 AA31 BA11 BA12 2H035 CA05 CB06 4D075 AB03 AB36 BB02X BB26Z CA18 DA10 DB15 DA20 DB20 DB07 DB39 DB54 DC18 DC21 DC24 EA07 EA31 EB19 EB22 EB35 EB39 EB44 4F205 AA40 AC05 AG16 GA06 GB01 GC01 GF03 GF24 GN13 GN29 GW06
Claims (7)
し、該塗膜を基体上に保持したまま加熱して樹脂を成膜
することを特徴とする被膜形成方法。1. Using a substrate having a roughened surface, a resin solution is uniformly applied to the surface of the substrate to form a coating film, and the coating film is heated while holding the coating film on the substrate to form a resin. A method for forming a film, comprising forming a film.
し、該塗膜を基体上に保持したまま加熱して樹脂を成膜
することを特徴とする被膜形成方法。2. Using a substrate provided with holes in its surface, applying a resin solution uniformly to the surface of the substrate to form a coating film, and heating the resin film while holding the coating film on the substrate to form a resin. A method for forming a film, comprising forming a film.
し、該塗膜を芯体上に保持したまま加熱して樹脂を成膜
した後、芯体から分離することを特徴とする継ぎ目なし
ベルトの製造方法。3. A core body having a roughened surface, a resin solution is uniformly applied to the surface of the core body to form a coating film, and the coating film is heated while being held on the core body. A method for producing a seamless belt, comprising separating a resin from a core after forming a film.
し、該塗膜を芯体上に保持したまま加熱して樹脂を成膜
した後、芯体から分離することを特徴とする継ぎ目なし
ベルトの製造方法。4. Using a core having a hole in its surface, applying a resin solution uniformly to the surface of the core to form a coating film, and heating the core film while holding the coating film on the core. A method for producing a seamless belt, comprising separating a resin from a core after forming a film.
い、ポリイミド被膜からなる継ぎ目なしベルトを製造す
ることを特徴とする請求項３又は４に記載の継ぎ目なし
ベルトの製造方法。5. The method for producing a seamless belt according to claim 3, wherein a seamless belt made of a polyimide film is produced by using a polyimide precursor as the resin solution.
なしベルトの製造方法により得られることを特徴とする
継ぎ目なしベルト。6. A seamless belt obtained by the method for producing a seamless belt according to any one of claims 3 to 5.
する請求項６に記載の継ぎ目なしベルト。7. The seamless belt according to claim 6, wherein the front and rear surfaces have different roughness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000360969A JP2002160239A (en) | 2000-11-28 | 2000-11-28 | Method for forming film, jointless belt, and manufacturing method for jointless belt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000360969A JP2002160239A (en) | 2000-11-28 | 2000-11-28 | Method for forming film, jointless belt, and manufacturing method for jointless belt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002160239A true JP2002160239A (en) | 2002-06-04 |
Family
ID=18832474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000360969A Pending JP2002160239A (en) | 2000-11-28 | 2000-11-28 | Method for forming film, jointless belt, and manufacturing method for jointless belt |
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| Country | Link |
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| JP (1) | JP2002160239A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006240099A (en) * | 2005-03-03 | 2006-09-14 | Fuji Xerox Co Ltd | Endless belt made of thermosetting resin and its production method |
| JP2007058154A (en) * | 2005-07-26 | 2007-03-08 | Fuji Xerox Co Ltd | Intermediate transfer belt, production method thereof and image-forming device |
| JP2007114689A (en) * | 2005-10-24 | 2007-05-10 | Fuji Xerox Co Ltd | Core body mold, method for manufacturing core body mold, and method for manufacturing seamless tubular core body using core body mold |
| JP2008238597A (en) * | 2007-03-27 | 2008-10-09 | Ricoh Co Ltd | Polyimide resin seamless belt, its manufacturing method and image forming device |
| WO2009028022A1 (en) * | 2007-08-24 | 2009-03-05 | I.S.T. Corporation | Heat fixing belt, process for manufacturing the same, and image fixing apparatus |
| JP2013193229A (en) * | 2012-03-16 | 2013-09-30 | Nippon Zeon Co Ltd | Method of manufacturing polyimide laminate |
-
2000
- 2000-11-28 JP JP2000360969A patent/JP2002160239A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006240099A (en) * | 2005-03-03 | 2006-09-14 | Fuji Xerox Co Ltd | Endless belt made of thermosetting resin and its production method |
| JP2007058154A (en) * | 2005-07-26 | 2007-03-08 | Fuji Xerox Co Ltd | Intermediate transfer belt, production method thereof and image-forming device |
| JP2007114689A (en) * | 2005-10-24 | 2007-05-10 | Fuji Xerox Co Ltd | Core body mold, method for manufacturing core body mold, and method for manufacturing seamless tubular core body using core body mold |
| JP2008238597A (en) * | 2007-03-27 | 2008-10-09 | Ricoh Co Ltd | Polyimide resin seamless belt, its manufacturing method and image forming device |
| WO2009028022A1 (en) * | 2007-08-24 | 2009-03-05 | I.S.T. Corporation | Heat fixing belt, process for manufacturing the same, and image fixing apparatus |
| JP2013193229A (en) * | 2012-03-16 | 2013-09-30 | Nippon Zeon Co Ltd | Method of manufacturing polyimide laminate |
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