JP4077307B2 - Antistatic paper feed roller manufacturing method and antistatic paper feed roller manufactured by the manufacturing method - Google Patents

Description

【００６９】
【表２】

【００７０】
表中の各配合の数値は重量部である。また、表中の各配合は以下の通りである。
イオン導電性熱可塑性エラストマー組成物：フタル酸エステル類含有塩素系熱可塑性エラストマー組成物 東ソー株式会社製 エラステージＥＳ２５２０Ａ
ゴム：住友化学ＥＰＤＭ エスプレン６７０Ｆ（パラフィンオイル１００％油展）
水素添加スチレン系ＴＰＥコンパウンド：ＳＥＥＰＳ Ｍｎ＝３０万 クラレ製 セプトン４０７７ ＋ＰＰ（日本ポリケム製 ノバックＰＰ ＢＣ６）＋パラフィンオイル（出光興産製 ダイアナプロセスオイルＰＷ−３８０）；（ＳＥＥＰＳ：ＰＰ：オイル）＝（１００：３５：１７０）
【００７１】
導電剤１：ポリエーテルブロックナイロン１２樹脂＋金属塩 チバスペシャルティ・ケミカル株式会社製 イルガスタット（ＩＲＧＡＳＴＡＴ）Ｐ１８（ベース樹脂がポリアミド１２であり、この中にポリアミド１２とエーテルのブロック共重合体及び金属塩として過塩素酸ナトリウムを含んでいる）
導電剤２：ポリエーテル−ポリオレフィンブロック共重合体樹脂＋金属塩 三洋化成工業株式会社製 ペレスタット３００
導電剤３：ポリエーテルブロックナイロン６樹脂＋金属塩 チバスペシャルティ・ケミカル株式会社製 イルガスタット（ＩＲＧＡＳＴＡＴ）Ｐ２２（ベース樹脂がポリアミド６であり、この中にポリアミド６とエーテルのブロック共重合体及び金属塩として過塩素酸ナトリウムを含んでいる）
【００７２】
架橋剤１：田岡化学製 タッキロール２５０−ＩＩＩ
架橋剤２：田岡化学製 タッキロール２０１
架橋活性剤：酸化亜鉛 三井金属鉱業社製 酸化亜鉛2種
【００７３】
（実施例１〜実施例５）
実施例１〜実施例５は、ＥＰＤＭ２００重量部（オイル１００％を含む）及び水素添加スチレン系ＴＰＥコンパウンド１００重量部との動的架橋混合物を上記熱可塑性エラストマー組成物として用いた。実施例１、実施例４及び実施例５はポリエーテルを含むブロック共重合体樹脂及び金属塩を含むイオン導電性導電剤として導電剤１を用いて、その配合量を上記熱可塑性エラストマー組成物中のマトリクス成分に対して、９．８重量％〜２８．６重量％の割合で配合した。
実施例２はイオン導電性導電剤として導電剤２を用い、実施例３はイオン導電性導電剤として導電剤３を用い、各配合量を上記熱可塑性エラストマー組成物中のマトリクス成分に対して１６．７重量％の割合で配合した。
【００７４】
（比較例１〜３）
比較例１は市販の塩素系であるイオン導電性熱可塑性エラストマー組成物を用い、ポリエーテルを含むブロック共重合体樹脂及び金属塩を含むイオン導電性導電剤は配合しなかった。
比較例２，３は、実施例と同じ上記熱可塑性エラストマー組成物（Ａ）及び導電剤１を用いたが、導電剤１の配合量は上記熱可塑性エラストマー組成物中のマトリクス成分に対して各々、４．８重量％及び３７．５重量％の割合とした。
【００７５】
上記実施例１〜実施例５及び比較例１〜比較例３の熱可塑性エラストマー組成物、紙送りローラを、以下の各々の項目に関して、各々以下の様に測定および試験を行った。
【００７６】
（スラブシート表面抵抗測定）
表面抵抗の測定は、上記の様にして作製した１３０ｍｍ×１３０ｍｍ×２ｍｍのスラブシートに対して、アドバンテストコーポレーション社製のテジタル超高抵抗微小電流計Ｒ−８３４０Ａを用いて、２３℃、相対湿度５５％の恒温恒湿条件下で測定した。測定方法は、ＪＩＳ Ｋ６９１１に記載の表面抵抗率の測定法に従った。測定時の印加電圧は１ｋＶとした。
【００７７】
（印字評価試験）
カットしたローラをキャノン製インクジェットプリンターＳ３００に装着し、所定書式を印字し、インクが正常に飛んでいったか印刷面をビデオマイクロで観察し評価した。もしローラから静電気が発生していれば、その部分に画像乱れが生じる。
【００７８】
（感光体汚染）
ヒューレットパッカード社製のＬａｓｅｒ Ｊｅｔ４０５０型レーザービームプリンタのカートリッジ（カートリッジタイプＣ４１２Ｘ）のセットされている感光体に、スラブシートを押し付けた状態で、３２．５℃、相対湿度９０％の条件下で１週間保管する。その後、感光体からスラブシートを除去し、当該感光体を用いて上記プリンターにてハーフトーンの印刷を行い、印刷物に汚れがでるかどうかを以下の基準で評価した。
○：印刷物を目で見る限り汚染なし。
△：軽度の汚染。（５枚以内の刷り込みにより、目で見てわからない程度にまでとれる使用上問題ない汚染）
×：重度の汚染（５枚以内の刷り込んでも、印刷物を目で見て異常が判る汚染。
【００７９】
（圧縮永久歪み）
ＪＩＳ Ｋ６２６２「加硫ゴムの永久歪み試験方法」の規定に従い、測定温度７０℃、測定時間２４時間で測定した。
【００８０】
（硬度）
ＪＩＳ Ｋ６２５３「加硫ゴム及び熱可塑性ゴムの硬さ試験方法」の規定に従い、デュロメータ硬さ試験、タイプＡで試験した。
【００８１】
表１に示される様に、実施例１乃至実施例５の半導電性熱可塑性エラストマー組成物を用いて形成された紙送りローラは、全て測定温度７０℃、測定時間２２〜２４時間での圧縮永久歪みが３０％以下であり、かつ、ショアＡ硬度が１０以上５０以下で、かつ１０００Ｖで測定したときの表面抵抗率が１０の１１乗（Ω・ｃｍ）以下であった。また、印字評価も全て異常なく、静電気の発生による印字のずれは生じなかった。そして感光体汚染も全くみられなかった。
よって、実施例の半導電性熱可塑性エラストマー組成物を用いた紙送りローラは、全て、紙送りローラに適した硬度及び圧縮永久歪みを有すると共に、優れた帯電防止性能を有することが確認できた。
【００８２】
また、実施例１〜５の材料は、ポリマー中に塩素を含有していないので、環境にも優しいものであった。さらには、実施例１〜５の半導電性熱可塑性エラストマー組成物は熱可塑性を有しているのでリサイクルも可能である上に流動性にも富んでいるため、成形加工性にも優れていた。
【００８３】
また、実施例１〜５は少なくとも、上記熱可塑性エラストマー組成物（Ａ）と上記イオン導電性導電剤（Ｂ）との混合前に、上記熱可塑性エラストマー組成物（Ａ）の動的架橋を行っているので、不必要にイオン導電性導電剤（Ｂ）の使用量を増やすことがなく、また、均一に分散させることができ、このため硬度の上昇を抑えることができ、かつ、原材料コストを抑えることができた。
【００８４】
一方、表１、表２に示すように、導電剤１〜３が配合されていない比較例１は、ＤＯＰ等のフタル酸エステル類を含有しているため、圧縮永久歪みが大きく、はめ込み後にゆるみが発生してしまい、ローラとしては不適であった。また、感光体汚染も生じた。比較例２は、導電剤１の配合量が、少なく、詳細には、上記熱可塑性エラストマー組成物（Ａ）中のマトリクス成分１００重量部に対して、上記イオン導電性導電剤（Ｂ）は９重量％以上３０重量％以下の割合の範囲外（４．８重量％）で配合しているため、表面抵抗の常用対数値は１３．５と高かった。よって、印字試験においても、静電気の発生により、ずれが生じてしまった。比較例３は、導電剤１の配合量が、多すぎた（３７．５重量％）ため、硬度が５０を越えてしまい、そのため、摩擦係数が低くなり、紙送りローラとしては不適であった。
【００８５】
【発明の効果】
以上の説明より明らかなように、本発明によれば、ゴムのような耐久性、弾性、柔軟性と樹脂のような良好な成形性を併せ持つと共に、半導電の抵抗値を有するチューブ状成形体を備えた帯電防止紙送りローラを得ることができる。また、該チューブ状成形体は熱可塑性であるため、リサイクルも可能であり、高価なイオン導電剤を不用意に増量することなく低抵抗を実現できるので、コスト的にも有利である。
【００８６】
よって、本発明の帯電防止紙送りローラは、レーザープリンター、静電式複写機、普通紙ファクシミリ装置、ＡＴＭ等の紙送りローラとして好適に用いられ、特に、紙等の搬送媒体に帯電した静電気によって画像等に影響を与えてしまう機構を持った印刷装置、例えば、高画質用のインクジェットプリンターや静電式複写機に搭載される紙送りローラとして非常に好適に用いることができ、印字ずれのない良好な画像を得ることができる。
【図面の簡単な説明】
【図１】 本発明の紙送りローラの概略図である。
【符号の説明】
１ 紙送りローラ
２ 軸芯[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to an antistatic paper feed roller.Manufacturing method and antistatic paper feed roller manufactured by the manufacturing methodFor more details,A semiconductive thermoplastic elastomer composition,It has the characteristics of rubber and resin, and realizes semiconductive resistance value, such as OA equipment such as inkjet printer, laser printer, electrostatic copying machine, plain paper facsimile machine, automatic deposit payment machine (ATM), etc. Mounted on paper feed rollers used in paper feed mechanisms, especially on printing devices such as high-quality inkjet printers, laser printers, and electrostatic copiers, where the image can be affected by static electricity charged on transported materials such as paper. Used as a paper feed rollerRumoIt is.
[0002]
[Prior art]
Rubber compositions, elastomer compositions, etc. for paper feeding mechanisms that transport paper and films in OA equipment such as inkjet printers, laser printers, electrostatic copying machines, facsimile machines, and automatic deposit payment machines (ATMs) A paper feed roller is used.
[0003]
In recent years, in particular, printing apparatuses such as ink jet printers, laser printers, and electrostatic copying machines are required to have higher image quality, and suppression of image disturbance due to static electricity charged on a transported object such as paper is desired. For this reason, a certain degree of conductivity is required in a paper feed roller for transporting paper, film, etc., and an antistatic paper feed roller has been developed.
[0004]
As such a paper feed roller having conductivity, a vulcanized rubber composition or the like can be considered, but an ion conductive thermoplastic elastomer composition can be used for a paper feed roller. For example, JP-A-9-301568. A chlorine-based conductive thermoplastic elastomer composition as disclosed in Japanese Patent Application Laid-Open No. 9-328591 is proposed.
[0005]
JP-A-8-183866 discloses a thermoplastic elastomer sheet in which a permanent antistatic agent is added to an olefinic thermoplastic elastomer. In addition, as a resin antistatic agent, there is a bleed type using a conductive plasticizer.
[0006]
[Patent Document 1]
JP-A-9-301568
[0007]
[Patent Document 2]
Japanese Patent Laid-Open No. 9-328591
[0008]
[Patent Document 3]
JP-A-8-183866
[0009]
[Problems to be solved by the invention]
However, there is a drawback that the vulcanized rubber composition cannot be recycled. Furthermore, the chlorine-containing conductive thermoplastic elastomer composition as disclosed in epichlorohydrin rubber and the above-mentioned JP-A-9-301568 or JP-A-9-328591 contains chlorine and can be incinerated after use. Depending on the processing conditions, there is a risk that harmful gases such as hydrogen chloride and dioxins may be generated during combustion, depending on the processing conditions. At the time of disposal, there is a growing awareness of environmental problems. There are difficulties in handling.
[0010]
Further, the chlorine-based ion conductive thermoplastic elastomer disclosed in JP-A-9-301568 or JP-A-9-328591 has a problem that the compression set is large and the mechanical properties are not sufficient.
[0011]
In addition, the thermoplastic elastomer sheet described in JP-A-8-183866 has a high electric resistance value, causing image disturbance due to static electricity charged on a transported object such as paper, and the heat of a commercial product. Since the plastic elastomer is used as it is, the compression set is large, the performance is insufficient for use in a roller, and there is a problem that the compression set becomes large particularly when the hardness is low.
[0012]
Further, the bleed type using the conductive plasticizer described above impairs the mechanical properties, deteriorates the permanent compression set, and severely contaminates the photoconductor, creating a large shadow on the printed image. There is a problem that it cannot be used for parts around printers and printers. Furthermore, there is a problem in that flexibility is expressed by containing an ester plasticizer such as a phthalate ester which is suspected of an endocrine disrupting substance.
[0013]
  The present invention has been made in view of the above problems, and has a semiconductive thermoplastic elastomer having both elasticity and flexibility such as rubber and good moldability such as a resin, and an electrically semiconductive resistance value. CompositionConsists ofAnti-static paper feed roller that does not cause image distortion due to static electricity charged on paper and other conveyed objectsAnd its manufacturing methodIt is an issue to provide.
[0014]
[Means for Solving the Problems]
  In order to solve the above problems, the present invention provides:A method of manufacturing an antistatic paper feed roller formed by externally fitting a tubular molded body made of a semiconductive elastomer composition on the outer periphery of a core metal,
Create a kneaded product of compound (A) containing hydrogenated styrenic thermoplastic elastomer and polypropylene,
A compound (B) containing an oil-extended EPDM and a resin cross-linking agent is added to the kneaded product and heated and kneaded.Dynamic crosslinking and dispersiondidThermoplastic elastomer compositionCreate
In the dynamically crosslinked thermoplastic elastomer composition,Ion conductive conductive agent containing block copolymer resin containing polyether and metal saltAnd heat kneading to create a semiconductive thermoplastic elastomer composition,
The semiconductive thermoplastic elastomer composition is molded into the tubular molded body by an extruder or an injection molding machine, and the core metal is attached to the molded body,
The tubular molded body isAccording to JIS K6911 when measured at a measurement temperature of 70 ° C. and a measurement time of 22 to 24 hours according to JIS K6262, the compression set is 30% or less, the Shore A hardness is 10 or more and 50 or less, and the applied voltage is 1000V. The listed surface resistivity is 10 11 [Ω · cm] or lessTryingIt is characterized byMethod for manufacturing antistatic paper feed rollerIs provided.
[0015]
  As a result of earnest research, the present inventors haveCompound containing hydrogenated styrenic thermoplastic elastomer and polypropylene (A)Inside, crosslinkable rubberEPDMTheBy resin crosslinkingAn ion conductive conductive agent containing a block copolymer resin containing a polyether and a metal salt in a matrix of a thermoplastic elastomer composition dynamically crosslinked and dispersed (hereinafter also simply referred to as an ion conductive conductive agent) It is possible to obtain a semiconductive thermoplastic elastomer composition having both durability, elasticity, flexibility such as rubber, and good moldability such as a resin, and having a semiconductive resistance value. I found it.
[0016]
  Specifically, the ion conductive conductive agent is hardly mixed into the dynamically crosslinked domain, and the ion conductive conductive agent is unevenly distributed mainly in the matrix of the thermoplastic elastomer composition. Therefore, by adding the ionic conductive conductive agentEPDMThe cross-linking is not affected, and physical properties (such as an increase in hardness and a decrease in compression set) can be suppressed, and good moldability can be realized.
[0017]
  Also,the aboveThe semiconductive thermoplastic elastomer composition has thermoplasticity and can be recycled, and also has good fluidity, so it is excellent in moldability and secures and manufactures recyclability. Cost reduction has also been realized.
[0018]
  Therefore, the aboveHalfConductive thermoplastic elastomer compositionTubular molded body formed by moldingThe compression set at 70 ° C. for 22 to 24 hours is 30% or less, the Shore A hardness is 10 or more and 50 or less, and the surface resistivity when measured at 1000 V is 10 11 (Ω · cm) It can be as follows.
[0019]
In the permanent strain test method for vulcanized rubber described in JIS K6262, the size of the compression set measured at a measurement temperature of 70 ° C. and a measurement time of 22 to 24 hours is 30% or less. If the ratio is larger than 30%, the dimensional change when the paper feed roller or the like is molded becomes too large to be suitable for practical use. For example, in a paper feed roller, loosening occurs after fitting. In addition, Preferably it is 25% or less, and it is so good that it is small.
[0020]
In the hardness test method for vulcanized rubber and thermoplastic rubber described in JIS K6253, the shore A hardness of 10 to 50 tested in the durometer hardness test and type A is less than this range. This is because the durability is not sufficient. On the other hand, if it is larger than this range, the friction coefficient becomes low, which makes it unsuitable as a paper feed roller. That is, within this range, even when the paper feed roller is pressed against the paper or film with a relatively small pressure contact force, the paper feed roller is sufficiently deformed, and a large contact area can be obtained between the paper and the film. A more preferable Shore A hardness value is 25 or more and 45 or less.
[0021]
The surface resistivity described in JIS K6911 measured under constant temperature and humidity conditions of applied voltage 1000 V (1 kV), 23 ° C., and relative humidity 55% is 10 11 (Ω · cm) or less. If it is larger than the square, no antistatic effect is produced, and for example, when a paper feed roller or the like is used, a deviation occurs in printing. A more preferable value is 10 to the 10th power or lower. The lower the value, the better. However, from the viewpoint of balance with other physical properties, the value is preferably about 10 8 or more.
By setting it as such surface resistivity, the effect | action which can prevent the static electricity which generate | occur | produces on the surface of a roller when it is set as a paper feed roller works. For this reason, it is possible to prevent a phenomenon in which static electricity generated from the roller affects the photosensitive member and the like and a shadow is formed on the printed matter. Furthermore, when used as an inkjet roller, it is possible to prevent the phenomenon that the path of the flying ink droplet is distorted and the image is disturbed.
[0022]
The ion conductive conductive agent containing the block copolymer resin containing the polyether and the metal salt has a polyether structure, and thus has an extremely large effect of stabilizing ions such as the metal salt and lowering the electric resistance value. In addition, the structure other than the polyether in the block can ensure a certain degree of compatibility with the base polymer, so that it is difficult to deteriorate the good physical properties of the thermoplastic elastomer composition of the base. Physical properties and moldability can be obtained. As described above, the ion conductive conductive agent containing the block copolymer resin containing the polyether and the metal salt has a remarkably large effect of lowering the electric resistance as compared with other various antistatic agents, Good physical properties of the resulting thermoplastic elastomer composition can be ensured.
[0023]
  The ion conductive conductive agent is the aboveCompound containing hydrogenated styrenic thermoplastic elastomer and polypropylene (A)And 10% by weight or more and 30% by weight or less, and more preferably 10% by weight or more and 25% by weight or less, based on the total weight of the ionic conductive agent and the ionic conductive agent. Therefore, the required low surface resistivity can be obtained with a very small mixing amount.
  If the amount is less than the above range, the antistatic effect is not produced, and printing is shifted when the paper feeding roller is used. On the other hand, if the amount is more than the above range, it tends to be hard, and even if the ion conductive conductive agent is added to a certain level or more, the conductivity hardly changes. On the other hand, the cost of the ion conductive conductive agent is high because it is expensive. This is because it may be disadvantageous.
  Also,Semiconductive thermoplastic elastomerThe ion conductive conductive agent is preferably in a proportion of 3% by weight to 12% by weight with respect to the total weight of the composition.
[0024]
  The block copolymer resin containing the polyether in the ion conductive conductive agent is selected from the group consisting of a polyether block polyamide copolymer resin, a modified product of a polyether ester amide resin, and a polyether block polyolefin resin. One or more are preferable. Thereby, after kneading the semiconductive thermoplastic elastomer composition at a high temperature, when molding a paper feed roller or the like by injection molding or extrusion molding,polypropylenePhase structure (bar collation structure) advantageous for energization in matrix resinButThe electrical resistance value can be reduced more than before.
[0025]
Examples of the metal of the metal salt include alkali metals, alkaline earth metals, ammonium salts, and the like. Among them, lithium and sodium are preferably used because they are easily ion-dissociated.
[0026]
As the ion conductive conductive agent, an ion conductive conductive agent containing a polyether block polyamide copolymer resin and a metal salt is more preferable. As the polyether block amide copolymer resin, a polyether block nylon resin is used. More preferably, more specifically, polyether block nylon 11 resin, polyether block nylon 12 resin or polyether block nylon 6 resin is most suitable.
[0027]
  The thermoplastic elastomer composition isHydrogenationStyrenic thermoplastic elastomerAnd including polypropyleneDuring compound (A),Oil exhibitionEPDMAnd a resin cross-linking agentThe composition is based on a composition in which compound (B) is dispersed by dynamic crosslinking. Thereby, both low hardness and low compression set can be achieved, and further, elasticity and flexibility such as rubber and good moldability such as resin can be realized.
[0028]
  the aboveOil exhibitionEPDM andContains resin cross-linking agentIn the compound (B), it is most preferable that the rubber component contains 100% EPDM. When EPDM and other rubber are blended, the ratio of EPDM to the total rubber is 50% by weight or more, and further 80% by weight. The above is preferable. In EPDM, the main chain is composed of saturated hydrocarbons, and the main chain does not contain double bonds. Therefore, even when exposed to an environment such as high-concentration ozone atmosphere or light irradiation including ultraviolet rays, EPDM can cleave the molecular main chain. Hard to happen. Therefore, ozone resistance, ultraviolet resistance, and heat resistance can be improved by increasing the ratio of EPDM that is excellent in ozone resistance, ultraviolet resistance, and heat resistance as described above.
[0029]
  In the above compound (B)InRubber components other than EPDMWhen blendingDiene rubber is preferable, chloroprene rubber (CR), natural rubber (NR), butadiene rubber (BR), styrene butadiene rubber (SBR), isoprene rubber (IR), acrylonitrile-butadiene rubber (NBR), hydrogenated nitrile rubber. (HNBR) or the like is used favorably, and one or more kinds may be blended. In addition, butyl rubber (IIR), halogenated butyl rubber (X-IIR), ethylene propylene rubber, BIMS (rubber obtained by bromination of a copolymer of isobutylene and p-methylstyrene), fluorine rubber, silicon-Rubber, acrylic rubber, chlorosulfonated polyethylene rubber, etc.Blend in EPDMYou can also. In addition, the rubber component is preferably a non-halogen type that does not contain a halogen component.
[0030]
  Also,In addition to EPDM, the above compound (B)Examples of cross-linkable thermoplastic elastomers include styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), and partially hydrogenated products thereof.MixYou can also.
[0031]
  The compound (A) is the aboveEPDMThe softener may be contained in an amount of 15 to 500 parts by weight, preferably 25 to 400 parts by weight, based on 100 parts by weight. Thereby, moderate softness | flexibility and elasticity can be obtained.
  The reason for the above range is that the hardness is likely to be high if it is smaller than the above range. On the other hand, if it is larger than the above range, the softening agent bleeds from the surface of the dynamic cross-linked product, or the softening agent migrates to the rubber to cause cross-linking inhibition, and the physical properties are likely to be lowered.
[0032]
  The compound (A) is the aboveEPDMFor 100 parts by weightpolypropylene1 to 50 parts by weight, preferably 2 to 40 parts by weight, more preferably 4 to 35 parts by weight.Compound (A) is hydrogenatedStyrenic thermoplastic elastomers andpolypropyleneUsingThe
  The above range is less than the above rangepolypropyleneThis is because the amount is too small and the effect of improving workability cannot be clearly confirmed. On the other hand, if it is larger than the above range, the hardness of the roller tends to increase.
[0033]
  The compound (B) is the aboveEPDMThe softener may be contained in an amount of 15 to 600 parts by weight, preferably 25 to 400 parts by weight, based on 100 parts by weight. Thereby, moderate softness | flexibility and elasticity can be obtained.
  The reason for the above range is that the hardness is likely to be high if it is smaller than the above range. On the other hand, if it is larger than the above range, the softening agent bleeds from the surface of the dynamically cross-linked product, or the softening agent causes cross-linking inhibition, and the rubber component.EPDMIs not sufficiently cross-linked, and the physical properties are likely to deteriorate.
[0034]
  the aboveHydrogenationStyrenic thermoplastic elastomers andpolypropyleneAnd the above EPDMThe weight ratio is (styrenic thermoplastic elastomer andpolypropylene: EPDM)= (60:40) to (15:85) is preferable (excluding the weight of the oil).
  The above range is the rubber component from the above range.EPDMIf there is a large amount, it is difficult to obtain good moldability, while the rubber componentEPDMThis is because if the amount is small, compression set tends to deteriorate. More preferably, it is (45:55) to (25:75).
[0035]
In this application, the weight part of the rubber component means the weight part of the non-oil extended rubber when the rubber is non-oil extended rubber, and the weight of the oil component from the oil extended rubber when the rubber is oil extended rubber. The weight part is represented by the weight of only the rubber component minus. Further, when the rubber is a mixture of oil-extended rubber and non-oil-extended rubber, the weight part is expressed by the total weight of the weight of only the rubber component obtained by subtracting the oil component from the oil-extended rubber and the weight of the non-oil-extended rubber.
[0036]
  The rubber used is oil-extended to obtain good mechanical properties.EPDMRubberIncludingThose having a molecular weight as large as possible are preferred.Oil exhibitionEPDMIngredientsPhysical examples include Sumitomo Chemical's Esprene 670F and Esprene 601F, and 501 × 100 manufactured by Idemitsu DMS.
[0037]
  In the above compound (A),Provides fluidity, compatibilizing ability, and moderate scratch resistanceThePolypropylene because of its excellent processability and good compatibility with EPDMContains.Other commercially available olefin resins can be blended, and one or more of polyethylene, ethylene ethyl acrylate resin, ethylene vinyl acetate resin, ethylene methacrylic acid resin, ionomer resin, polyester resin, chlorinated polyethylene, etc. are blended You may do it. In addition, various other thermoplastic resins can be blended with the polypropylene.
[0038]
Examples of the softener include oil and plasticizer. As the oil, for example, a paraffinic, naphthenic or aromatic mineral oil or a synthetic oil known per se made of a hydrocarbon oligomer or a process oil can be used. As the synthetic oil, for example, an oligomer with α-olefin, an oligomer of butene, and an amorphous oligomer of ethylene and α-olefin are preferable. As the plasticizer, for example, dioctyl phthalate (DOP), dibutyl phthalate (DBP), dioctyl separate (DOS), dioctyl adipate (DOA) and the like can be used.
[0039]
  Dynamic crosslinking aboveIsPerformed by resin crosslinking using a resin crosslinking agentTrying. Resin cross-linking agent is a synthetic resin that causes a cross-linking reaction to rubber by heating, etc. Compared with the use of sulfur and vulcanization accelerator in combination, bloom is less likely to occur, compression set is small, physical properties are reduced, and accuracy is maintained. And preferable in terms of durability. Furthermore, since the cross-linking time is shorter than that of the sulfur cross-linking system, the dynamic cross-linking can proceed within a short time staying in the extruder. In particular, a phenol resin is preferable.
[0040]
  Examples of other resin cross-linking agents include melamine / formaldehyde resins, triazine / formaldehyde condensates, hexamethoxymethyl / melamine resins, and the like.
  Specific examples of the phenol resin include various phenol resins synthesized by reacting phenols such as phenol, alkylphenol, cresol, xylenol, and resorcin with aldehydes such as formaldehyde, acetaldehyde, and furfural. In particular, the alkylphenol-formaldehyde resin obtained by the reaction of formaldehyde with an alkylphenol having an alkyl group bonded to the ortho- or para-position of benzene is excellent in compatibility with rubber and has a high reactivity and a crosslinking reaction initiation time. Is preferable because it can be performed relatively quickly. The alkyl group of the alkylphenol / formaldehyde resin is usually an alkyl group having 1 to 10 carbon atoms, and specific examples include a methyl group, an ethyl group, a propyl group, and a butyl group. A modified alkylphenol resin obtained by addition condensation of sulfurized p-tertiary butylphenol and aldehydes, or an alkylphenol sulfide resin can also be used as a resin crosslinking agent. The compounding amount of the resin crosslinking agent is as described above.EPDMThe amount is preferably 2 to 20 parts by weight, more preferably 5 to 15 parts by weight, based on 100 parts by weight.
[0041]
  In the above compound (A), Hydrogenated styrene thermoplastic elastomerContains. Hydrogenated styrene thermoplastic elastomer has saturated double bonds due to hydrogenation, and has low hardness and excellent durability. As described above, since there is no double bond, it is not cross-linked by reacting with a cross-linking agent at the time of dynamic cross-linking, so that it does not inhibit rubber cross-linking, and an elastomer composition after dynamic cross-linking is desired. Plasticity can be expressed. Therefore, the present invention uses a styrenic thermoplastic elastomer that is hydrogenated to such an extent that it is not crosslinked during dynamic crosslinking.ing. Further, from the viewpoint of mechanical strength, the molecular weight is preferably 80,000 or more. Further, from the viewpoint of mechanical strength, the molecular weight is preferably 80,000 or more. It is also possible to add a non-hydrogenated thermoplastic elastomer (SBS, SIS, etc.) as long as the processability is not lost.
[0042]
  Examples of the hydrogenated styrene thermoplastic elastomer include styrene-ethylene-ethylene / propylene-styrene copolymer (SEEPS), styrene-ethylene / propylene-styrene copolymer (SEPS), and styrene-ethylene / butylene-styrene copolymer. A polymer (SEBS) is mentioned. In addition,In addition to the above hydrogenated styrene thermoplastic elastomerVarious thermoplastic elastomers such as polyolefin, polyester, polyamide and polyurethaneMixthingAlsoit can.
[0043]
  A crosslinking activator may be used to appropriately perform the crosslinking reaction. Metal oxide is used as the crosslinking activator.,acidZinc halide and zinc carbonate are preferredIn particular, zinc oxide is preferred. The crosslinking activator is the aboveEPDM0.5 parts by weight or more and 10 parts by weight or less, and further 1 part by weight or more and 5 parts by weight or less are preferable with respect to 100 parts by weight.
[0044]
  The above dynamic crosslinking is,paperFriction coefficient and wear resistance as a feed rollerThan peroxide cross-linkingResin cross-linking is betterBecause of resin cross-linking. Sulfur bridging often has the possibility of bloom, and generally has a large compression set, which may cause problems in maintaining accuracy and durability when used as a roller for a long period of time.
[0046]
  In the method for producing an antistatic paper feed roller of the present invention, a compound (A) comprising a hydrogenated styrenic thermoplastic elastomer and polypropyleneinside,Compounding oil-extended EPDM and compound (B) containing resin cross-linking agent,Crosslinkable rubberEPDM is a resin cross-linking agentA thermoplastic elastomer composition dispersed by dynamic crosslinking;
  Semiconductive thermoplastic elastomer composition comprising block copolymer resin containing polyether and ionic conductive conductive agent containing metal saltTheProduction methodButBefore mixing the thermoplastic elastomer composition and the ionic conductive conductive agent, the thermoplastic elastomer composition is dynamically crosslinked.Trying.
[0047]
  Specifically, in an extruder or a kneader, the aboveEPDMTheDepending on resin cross-linking agentAbove by dynamic crosslinkingCompound containing hydrogenated styrenic thermoplastic elastomer and polypropyleneAfter being dispersed in, the composition obtained by the dynamic crosslinking is kneaded again with an extruder or a kneader, and mixed with the ionic conductive conductive agent,the aboveA semiconductive thermoplastic elastomer composition is obtained.
[0048]
  As a result of diligent research, the present inventor has found that the ion conductive conductive agent has a feature that it is difficult to enter the dynamically cross-linked domain phase and is selectively mixed into the matrix phase. . For this reason, according to the said manufacturing method, an ion conductive conductive agent will be selectively arrange | positioned toward the matrix of a semiconductive thermoplastic elastomer composition, and an ion conductive conductive agent will become a matrix.Includes hydrogenated styrenic thermoplastic elastomer and polypropyleneIt can be unevenly distributed in the thermoplastic elastomer. As a result, even if an ion conductive conductive agent is blendedEPDMSince it does not affect the degree of cross-linking of rubber, it is possible to suppress an increase in compression set and to prevent an increase in hardness without unnecessarily increasing the amount of ion conductive conductive agent used. And cost of raw materials can be reduced. Thereby, the said ion conductive conductive agent can also be arrange | positioned on the surface side.
[0049]
The heating temperature at the time of dynamic crosslinking is preferably 160 ° C. to 200 ° C., and the heating time is preferably 1 to 20 minutes. The heating temperature at the time of mixing the ion conductive conductive agent is preferably 160 to 220 ° C. and the heating time is 1 to 20 minutes. The thermoplastic elastomer composition obtained by the dynamic cross-linking is preferably formed into a pellet shape for the subsequent process. Thereby, favorable moldability can be obtained.
[0050]
  For dynamic crosslinking and kneading, a twin screw extruder, Banbury mixer, kneader, etc. can be used..
[0051]
  BookDepartureTomorrow,the aboveSemiconductive thermoplastic elastomer compositionFor tube shaped productsMoldedBy attaching a cored bar to the molded bodyAntistatic paper feed rollerManufacturingis doing.
  The above tubular molded bodyIs superior in that it has a low surface resistivity, a small compression set, and a low hardness.Antistatic of the present inventionPaper feed lowLaIt is used for paper feeding mechanisms such as laser printers, electrostatic copying machines, plain paper facsimile machines, and ATMs. In particular, the present inventionantistaticSince the paper feed roller has a low surface resistivity, static electricity generated on the roller can be suppressed. Therefore, it is suitable as a paper feed roller mounted on a printing apparatus having a mechanism that affects the image or the like due to static electricity charged on a transport medium such as paper, for example, an ink jet printer for high image quality or an electrostatic copying machine. Used for.
[0052]
  Of the present inventionUsed in the manufacture of antistatic paper feed rollersSince the semiconductive thermoplastic elastomer composition is excellent in fluidity, it can be extruded into a tube shape or injection-molded, and is very excellent in molding processability. The paper feed roller and the like can be produced by a conventionally known method, and specifically, the following methods can be mentioned.
  the aboveThe semiconductive thermoplastic elastomer composition is pelletized, and the pellet is injection molded by an injection molding machine to form a tube. After the surface of this molded product is polished, it is cut to the required dimensions to form a paper feed roller. In addition, it can also be set as a roller by extruding in the shape of a tube with a single screw extruder for resin instead of an injection molding machine, polishing if necessary, and cutting it.
[0053]
  The surface of the antistatic paper feed roller of the present invention (the contact surface with a transported material such as paper or film) may be formed of at least the semiconductive thermoplastic elastomer composition. Specifically, a tubular molded body made of an elastomer composition is placed on the outer periphery of a metal core made of metal or ceramics.Fiting. An adhesive layer or the like can be provided between the core metal and the paper feed roller. Further, the surface thereof may be polished, and the surface of the roller is brought into contact with the paper so as to obtain a large gripping force, so that the friction coefficient can be increased.
[0054]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the antistatic paper feed roller 1 of the present embodiment is formed by forming a semiconductive thermoplastic elastomer composition into a cylindrical roller and press-fitting the shaft core 2 into the hollow portion, or both of them. It is fixed with an adhesive.
[0055]
  This semiconductive thermoplastic elastomer composition is:Compound containing hydrogenated styrenic thermoplastic elastomer and polypropyleneInside, crosslinkable rubberEPDMThe main component is a thermoplastic elastomer composition that is dynamically cross-linked and dispersed into a matrixHydrogenated styrenic thermoplastic elastomer and polypropyleneIt is obtained by dispersing therein a block copolymer resin containing a polyether and an ion conductive conductive agent containing a metal salt.
[0056]
  Specifically, the thermoplastic elastomer composition isHydrogenationStyrenic thermoplastic elastomers andpolypropyleneIn the compound (A) whose main component isOil exhibitionContains EPDMis doingThe composition is based on a composition in which compound (B) is dispersed by dynamic crosslinking using two kinds of resin crosslinking agents (total 12 parts by weight) and a crosslinking activator (3.5 parts by weight).
[0057]
Compound (A) is a compound containing styrene-ethylene-ethylene / propylene-styrene copolymer (SEEPS) which is a hydrogenated styrene-based thermoplastic elastomer, polypropylene which is an olefin-based resin, and paraffin oil which is a softening agent. And 100 parts by weight are used. (SEEPS: PP: oil) = (100: 35: 170).
[0058]
The compound (B) is ethylene-propylene-diene rubber (EPDM) 100% oil-extended with paraffin oil, which is a crosslinkable rubber, and 200 parts by weight of this oil-extended EPDM is used.
[0059]
  In the ion conductive conductive agent, the base resin is polyamide 12, and a block copolymer of polyamide 12 and ether and a material containing sodium perchlorate as a metal salt are used.polypropyleneas well asHydrogenated styreneIt is contained in a proportion of 16.7% by weight based on the total weight of the compound containing the thermoplastic elastomer and the ionic conductive conductive agent.
[0060]
  This semiconductive thermoplastic elastomer compositionThe tubular molded body molded fromThe measurement temperature is 70 ° C., the compression set at 22 to 24 hours is 17%, the Shore A hardness is 39, and the surface resistivity when measured at 1000 V is 10 to the 9.8th power (Ω · cm). .
[0061]
  Hereinafter, this embodimentUsed to manufacture antistatic paper feed rollersThe production method of the semiconductive thermoplastic elastomer composition will be described in detail.
  The hydrogenated styrenic thermoplastic elastomer composition is swollen in a softener and thenpolypropyleneHydrogenated styrenic thermoplastic elastomer composition, kneaded with resin pellets at a temperature of 160 ° C. to 220 ° C. for 1 to 20 minutes with a twin screw extruder, kneader or Banbury, etc.polypropylenePrepare pellets consisting of a mixture of resin and softener (compound (A)).,After that, this pellet and oil-extended EPDM rubber, Phenolic resin as resin cross-linking agent, zinc whiteCompound (B), ThatOtherOld if desiredNecessary additives such as anti-oxidation agents and fillers are put into a twin-screw extruder, kneaded for 1 to 20 minutes while heating at a temperature of 160 ° C to 220 ° C, and the rubber is dynamically crosslinked and then extruded. ing. At this point, dynamic crosslinking has already been performed.
[0062]
Next, the extruded kneaded composition is cooled and pelletized. Furthermore, the ionic conductive conductive agent was mixed with the pellets of the dynamic crosslinking composition obtained in this way, charged again into the twin screw extruder, and kneaded at a temperature of 160 ° C. to 220 ° C. for 1 to 20 minutes. And the semiconductive thermoplastic elastomer composition of this embodiment is obtained. In addition, you may knead | mix by a kneader or a banbury. Thereafter, the mixture of the dynamic crosslinking composition and the conductive agent (the elastomer composition of this embodiment) is pelletized by a usual method.
[0063]
  This semiconductive thermoplastic elastomer compositionThingsExtruded into a tube with an extruderMolded into a tube-shaped molded body, and a cored bar is attached to the molded body to feed the antistatic paper of this embodiment.Roller is molded.
[0064]
  Thus, the antistatic paper feed roller 1 isthe aboveSince it is molded from the semiconductive thermoplastic elastomer composition, it has durability such as rubber, elasticity, flexibility, and moldability such as resin, and can achieve semiconductivity. Moreover, since it does not contain chlorine and does not generate harmful gas at the time of disposal, it is environmentally friendly and has excellent recyclability due to its thermoplasticity. Moreover, since it is rich in fluidity, it is excellent in moldability. Therefore, printing deviation does not occur, and it can be particularly suitably used as a paper feed roller for a high-quality inkjet printer or the like.
[0065]
  In the above embodiment, EPDM is used as the crosslinkable rubber.onlyA crosslinkable thermoplastic elastomer as described above.ーOther rubberAdd moreYou can also.HydrogenationStyrenic thermoplastic elastomerーThe type may be changed as appropriate.In addition, an olefin resin other than polypropylene may be blended.. Moreover, the compounding quantity of various compounding materials can be set suitably. The block copolymer resin containing the polyether in the ion conductive conductive agent is selected from the group consisting of a polyether block polyamide copolymer resin, a modified polyether ester amide resin, and a polyether block polyolefin resin. 1 or more types.
[0066]
Hereinafter, Examples 1 to 5 and Comparative Examples 1 to 3 of the paper feed roller of the present invention will be described in detail.
The paper feed rollers of Examples and Comparative Examples were prepared by the same method as in the above embodiment, using the formulations of Examples 1 to 5 and Comparative Examples 2 and 3 described in Table 1 below. Using pellets of the elastomer composition, a paper feed roller, various slab sheets for evaluating physical properties, and the like were produced as follows.
However, as shown in Table 2, Comparative Example 1 uses Examples 1 to 5 and Comparative Example 2 using pellets of a chlorinated thermoplastic elastomer composition (trade name: Elastage) purchased from Tosoh Corporation. In the same manner as in Comparative Example 3, a paper feed roller, various physical property evaluation slab sheets and the like were prepared as follows.
[0067]
That is, the elastomer composition pellets produced by the method of the above embodiment were put into a resin extruder, extruded into a tube shape and cut into a paper feed roller having an inner diameter of 31 mm, an outer diameter of 36 mm, and a width of 17 mm.
Moreover, the said pellet was shape | molded with the injection molding machine, samples, such as a 130 mm x 130 mmx2mm slab sheet and the compression ball as described in following JIS, were produced, and the following various physical-property evaluation was performed.
[0068]
[Table 1]

[0069]
[Table 2]

[0070]
The numerical value of each formulation in the table is parts by weight. Moreover, each compounding in the table is as follows.
Ion conductive thermoplastic elastomer composition: Chlorine-based thermoplastic elastomer composition containing phthalates Estela ES2520A manufactured by Tosoh Corporation
Rubber: Sumitomo Chemical EPDM Esplene 670F (paraffin oil 100% oil exhibition)
Hydrogenated styrene-based TPE compound: SEEPS Mn = 300,000 Kuraray Septon 4077 + PP (Nippon Polychem Novak PP BC6) + paraffin oil (Idemitsu Kosan Diana Process Oil PW-380); (SEEPS: PP: oil) = (100 : 35: 170)
[0071]
Conductive agent 1: Polyether block nylon 12 resin + metal salt Ciba Specialty Chemicals Co., Ltd. IRGASTAT P18 (base resin is polyamide 12, in which polyamide 12 and ether block copolymer and metal salt As containing sodium perchlorate)
Conductive agent 2: Polyether-polyolefin block copolymer resin + metal salt Pelestat 300 manufactured by Sanyo Chemical Industries, Ltd.
Conductive agent 3: Polyether block nylon 6 resin + metal salt Ciba Specialty Chemicals Co., Ltd. IRGASTAT P22 (base resin is polyamide 6, in which polyamide 6 and ether block copolymer and metal salt As containing sodium perchlorate)
[0072]
Crosslinking agent 1: TAOKA CHEMICAL TAKIROLL 250-III
Cross-linking agent 2: Takiroll 201 manufactured by Taoka Chemical
Cross-linking activator: Zinc oxide 2 types of zinc oxide manufactured by Mitsui Mining & Smelting Co., Ltd.
[0073]
  (Example 1 to Example 5)
  In Examples 1 to 5, 200 parts by weight of EPDM (including 100% oil) and hydrogenated styrene TPEA dynamically crosslinked mixture with 100 parts by weight of the compound was used as the thermoplastic elastomer composition. Example 1, Example 4 and Example 5 use the conductive agent 1 as an ionic conductive conductive agent containing a block copolymer resin and a metal salt containing a polyether, and the blending amount thereof is in the thermoplastic elastomer composition. 9.8 wt% to 28.6 wt% of the matrix component.
  Example 2 uses conductive agent 2 as the ion conductive conductive agent, and Example 3 uses conductive agent 3 as the ion conductive conductive agent.TheEach blending amount was blended in a proportion of 16.7% by weight with respect to the matrix component in the thermoplastic elastomer composition.
[0074]
(Comparative Examples 1-3)
In Comparative Example 1, a commercially available ionic conductive thermoplastic elastomer composition that is chlorine-based was used, and a block copolymer resin containing a polyether and an ionic conductive conductive agent containing a metal salt were not blended.
Comparative Examples 2 and 3 used the same thermoplastic elastomer composition (A) and conductive agent 1 as in Examples, but the blending amount of the conductive agent 1 was each based on the matrix components in the thermoplastic elastomer composition. The ratio was 4.8 wt% and 37.5 wt%.
[0075]
The thermoplastic elastomer compositions and paper feed rollers of Examples 1 to 5 and Comparative Examples 1 to 3 were measured and tested as follows for the following items.
[0076]
(Slab sheet surface resistance measurement)
The surface resistance was measured at 23 ° C. and relative humidity of 55 using a digital ultrahigh resistance microammeter R-8340A manufactured by Advantest Corporation on the 130 mm × 130 mm × 2 mm slab sheet produced as described above. % Constant temperature and humidity conditions. The measurement method followed the surface resistivity measurement method described in JIS K6911. The applied voltage during measurement was 1 kV.
[0077]
(Print evaluation test)
The cut roller was mounted on a Canon inkjet printer S300, a predetermined format was printed, and the printed surface was observed with a video micro to evaluate whether the ink was normally blown. If static electricity is generated from the roller, image distortion occurs in that portion.
[0078]
  (Photoconductor contamination)
  Laser Jet 4050 laser beam manufactured by Hewlett-Packard Company-A slab sheet is pressed against the photoreceptor in which the cartridge of the printer (cartridge type C412X) is set, and stored for 1 week under conditions of 32.5 ° C. and 90% relative humidity. Thereafter, the slab sheet was removed from the photoconductor, halftone printing was performed with the printer using the photoconductor, and whether or not the printed material was stained was evaluated according to the following criteria.
  ○: As long as the printed material is visually confirmed, there is no contamination.
  Δ: Mild contamination. (With no more than 5 imprints, it can be removed to the extent that it cannot be seen with eyes.)
  ×: Severe contamination (Even if imprinting within 5 sheets, look at the printed matter visuallyAbnormalCan see pollution.
[0079]
(Compression set)
The measurement was performed at a measurement temperature of 70 ° C. and a measurement time of 24 hours in accordance with the provisions of JIS K6262 “Testing method for permanent deformation of vulcanized rubber”.
[0080]
(hardness)
In accordance with JIS K6253 “Method for testing hardness of vulcanized rubber and thermoplastic rubber”, a durometer hardness test, type A, was used.
[0081]
  As shown in Table 1, all the paper feed rollers formed using the semiconductive thermoplastic elastomer compositions of Examples 1 to 5 were compressed at a measurement temperature of 70 ° C. and a measurement time of 22 to 24 hours. The permanent set was 30% or less, the Shore A hardness was 10 or more and 50 or less, and the surface resistivity when measured at 1000 V was 10 11 (Ω · cm) or less. Also, all the print evaluations were normal, and no print misalignment due to the generation of static electricity occurred. No photoconductor contamination was observed.
  Therefore, the exampleSemi-conductiveIt was confirmed that all the paper feed rollers using the thermoplastic elastomer composition had hardness and compression set suitable for the paper feed roller and had excellent antistatic performance.
[0082]
  Moreover, since the material of Examples 1-5 did not contain chlorine in the polymer, it was environmentally friendly. Furthermore, Examples 1 to5 is a semiconductive thermoplastic elastomer compositionSince it has thermoplasticity, it can be recycled and has excellent fluidity, so it has excellent moldability.
[0083]
In Examples 1 to 5, at least the thermoplastic elastomer composition (A) is dynamically crosslinked before mixing the thermoplastic elastomer composition (A) and the ionic conductive conductive agent (B). Therefore, the use amount of the ion conductive conductive agent (B) is not unnecessarily increased and can be uniformly dispersed, so that an increase in hardness can be suppressed and the raw material cost can be reduced. I was able to suppress it.
[0084]
On the other hand, as shown in Tables 1 and 2, Comparative Example 1 in which the conductive agents 1 to 3 are not blended contains phthalates such as DOP, and thus has a large compression set and loosens after fitting. Was generated and was unsuitable as a roller. Photoconductor contamination also occurred. In Comparative Example 2, the blending amount of the conductive agent 1 is small. Specifically, the ionic conductive conductive agent (B) is 9 with respect to 100 parts by weight of the matrix component in the thermoplastic elastomer composition (A). Since the blending was outside the range of 4.8% by weight to 30% by weight (4.8% by weight), the common logarithm of surface resistance was as high as 13.5. Therefore, even in the printing test, a deviation has occurred due to the generation of static electricity. In Comparative Example 3, since the blending amount of the conductive agent 1 was too large (37.5% by weight), the hardness exceeded 50, and thus the friction coefficient was low, which was not suitable as a paper feed roller. .
[0085]
【The invention's effect】
  As is clear from the above description, according to the present invention, the rubber has durability, elasticity, flexibility and good moldability such as resin, and has a semiconductive resistance value.An antistatic paper feed roller equipped with a tube-shaped bodyObtainable. Also,The tubular molded body isSince it is thermoplastic, it can be recycled and low resistance can be realized without inadvertently increasing the amount of expensive ionic conductive agent, which is advantageous in terms of cost.
[0086]
  Therefore, the present inventionAntistatic paper feed rollerIs suitably used as a paper feed roller for laser printers, electrostatic copiers, plain paper facsimile machines, ATMs, etc., and in particular has a mechanism that affects images and the like due to static electricity charged on transport media such as paper. It can be used very favorably as a paper feed roller mounted in a printing apparatus such as an inkjet printer for high image quality or an electrostatic copying machine, and a good image without printing deviation can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic view of a paper feed roller of the present invention.
[Explanation of symbols]
1 Paper feed roller
2 shaft core

Claims (7)

A method of manufacturing an antistatic paper feed roller formed by externally fitting a tubular molded body made of a semiconductive elastomer composition on the outer periphery of a core metal,
Create a kneaded product of compound (A) containing hydrogenated styrenic thermoplastic elastomer and polypropylene,
The above kneaded product, and heating and kneading by blending the compound (B) are blended with EPDM and resin crosslinking agents and oil-extended to create a thermoplastic elastomer composition EPDM is dispersed by dynamic crosslinking,
The above-mentioned dynamically crosslinked thermoplastic elastomer composition is blended with a block copolymer resin containing a polyether and an ionic conductive conductive agent containing a metal salt and heated and kneaded to obtain a semiconductive thermoplastic elastomer composition. make,
The semiconductive thermoplastic elastomer composition is molded into the tubular molded body by an extruder or an injection molding machine, and the core metal is attached to the molded body,
The tubular molded body has a compression set according to JIS K6262 of 30% or less, a Shore A hardness of 10 to 50 and an applied voltage of 1000 V measured at a measurement temperature of 70 ° C. and a measurement time of 22 to 24 hours. method for producing an antistatic paper-feeding roller of surface resistivity according to JIS K6911 when the measurement is characterized in that as a 10 11 square [Ω · cm] or less. The compound (A) contains 15 parts by weight or more and 500 parts by weight or less of the softening agent and 1 part by weight or more and 50 parts by weight or less of the polypropylene with respect to 100 parts by weight of the EPDM.
The method for producing an antistatic paper feed roller according to claim 1 , wherein the compound (B) contains a softening agent in a proportion of 15 parts by weight or more and 600 parts by weight or less with respect to 100 parts by weight of the EPDM . The antistatic paper feed according to claim 1 or 2, wherein the ion conductive conductive agent is blended at a ratio of 3 wt% to 12 wt% with respect to the total weight of the semiconductive elastomer composition. Roller manufacturing method . The hydrogenated styrene-based thermoplastic elastomer, the polypropylene, and the EPDM are in a weight ratio (the hydrogenated styrene-based thermoplastic elastomer and the polypropylene: the EPDM) = (45:55) to (25:75), and The method for producing an antistatic paper feed roller according to any one of claims 1 to 3, which is blended at a ratio of (the polypropylene: the EPDM) = (4: 100) to (35: 100) . The block copolymer resin containing the polyether in the ionic conductive conductive agent is selected from the group consisting of a polyether block polyamide copolymer resin, a modified product of a polyether ester amide resin, and a polyether block polyolefin resin. The method for producing an antistatic paper feed roller according to any one of claims 1 to 4 , wherein the method is one or more kinds . In the compound (B), the resin cross-linking agent is blended at a ratio of 5 parts by weight or more and 15 parts by weight or less based on 100 parts by weight of the EPDM.
Furthermore, the antistatic paper of any one of Claim 1 thru | or 5 which mix | blended zinc oxide as a crosslinking activator in the ratio of 1 to 5 weight part with respect to 100 weight part of said EPDM. Manufacturing method of feed roller. Either produced by the production method according to item 1, antistatic paper feed roller which is mounted on the ink jet printer or laser printer of claim 1 to claim 6.

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