JP2004347729A - Method for manufacturing conductive roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conductive roller by which the problem of close contactness between a conductive elastic layer and a surface layer such as the occurrence of wrinkles due to insufficiency in contactness is solved. <P>SOLUTION: The conductive roller is constituted by orderly laminating at least one conductive elastic layer consisting of a rubber elastic body and at least one surface layer consisting of a synthetic resin around a shaft, and the conductive elastic layer and the surface layer are stuck with each other with primer, wherein the primer is applied to the conductive elastic layer by spray coating and is dried, and then, solution obtained by diluting the constituting material of the surface layer with an organic solvent is applied to the elastic layer. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００３２】
（２＜ｍ＋ｎ≦５０、２＜ｍ、０≦ｎ、Ｒとしては主鎖の炭素数が２〜２０の炭化水素で１個以上のフェニル基を含有してもよい。）
【００３３】
【化２】

【００３４】
（０＜ｍ＋ｎ≦５０、０＜ｍ、０≦ｎ、Ｒとしては主鎖の炭素数が２〜２０の炭化水素で１個以上のフェニル基を含有してもよい。）
【００３５】
【化３】

【００３６】
（３≦ｍ＋ｎ≦２０、２＜ｍ≦１９、０≦ｎ＜１８、Ｒとしては主鎖の炭素数が２〜２０の炭化水素で１個以上のフェニル基を含有してもよい。）
などで示される鎖状、環状のものや、これらのユニットを２個以上有する
【００３７】
【化４】

【００３８】
（１≦ｍ＋ｎ≦５０、１≦ｍ、０≦ｎ、Ｒとしては主鎖の炭素数が２〜２０の炭化水素で１個以上のフェニル基を含有してもよい。２≦ｌ、Ｒ^２は２〜４価の有機基であり、Ｒ^１は２価の有機基。ただし、Ｒ^１はＲ^２の構造によってはなくてもよい。）
【００３９】
【化５】

【００４０】
（０≦ｍ＋ｎ≦５０、０≦ｍ、０≦ｎ、Ｒとしては主鎖の炭素数が２〜２０の炭化水素で１個以上のフェニル基を含有してもよい。２≦ｌ、Ｒ^２は２〜４価の有機基であり、Ｒ^１は２価の有機基。ただし、Ｒ^１はＲ^２の構造によってはなくてもよい。）
【００４１】
【化６】

【００４２】
（３≦ｍ＋ｎ≦５０、１≦ｍ、０≦ｎ、Ｒとしては主鎖の炭素数が２〜２０の炭化水素で１個以上のフェニル基を含有してもよい。２≦ｌ、Ｒ^２は２〜４価の有機基であり、Ｒ^１は２価の有機基。ただし、Ｒ^１はＲ^２の構造によってはなくてもよい。）
などで示されるものが挙げられる。
【００４３】
またこれら（Ｂ）成分の使用にあたっては、（Ａ）成分や（Ｃ）成分、（Ｄ）成分との相溶性、あるいは系中における分散安定性がよいものが好ましい。特に系全体の粘度が低い場合には、（Ｂ）成分として上記各成分との相溶性の低いものを使用すると、相分離が起こり硬化不良を引き起こすことがある。また、分散性助剤として、微粉末シリカ等の粒径の小さいフィラーを配合してもよい。
（Ａ）成分、（Ｃ）成分、（Ｄ）成分との相溶性、あるいは分散安定性が比較的良好なものとして具体的に示すと、
【００４４】
【化７】

【００４５】
（ｎは６〜１２）
【００４６】
【化８】

【００４７】
（２＜ｋ＜３５、０＜ｌ＜１０、Ｒは炭素数８以上の炭化水素基）
などが挙げられる。
【００４８】
また、本発明における（Ｂ）成分の使用量としては、（Ａ）成分のアルケニル基の総量に対して、（Ｂ）成分のケイ素原子結合水素原子が０．８当量以上、５．０当量以下となるように使用することが好ましい。上記（Ａ）成分のアルケニル基総量に対して（Ｂ）成分のケイ素原子結合水素原子が０．８当量に満たない場合、架橋が不十分となることがある。また、５．０当量を越える場合には、硬化後に残留するケイ素原子結合水素原子の影響により物性が大きく変化することが問題となる。特にこの影響を抑制したい場合には１．０当量以上、２．０当量以下となるように（Ｂ）成分を用いることが好ましい。
【００４９】
本発明の（Ｃ）成分であるヒドロシリル化触媒については、特に制限はなく、任意のものが使用できる。具体的に例示すれば、塩化白金酸、白金の単体、アルミナ、シリカ、カ−ボンブラック等の担体に固体白金を担持させたもの；白金ービニルシロキサン錯体｛例えば、Ｐｔ_ｎ（ＶｉＭｅ_２ＳｉＯＳｉＭｅ_２Ｖｉ）_ｎ、Ｐｔ〔（ＭｅＶｉＳｉＯ）_４〕_ｍ｝；白金ーホスフィン錯体｛例えば、Ｐｔ（ＰＰｈ_３）_４、Ｐｔ（ＰＢｕ_３）_４｝；白金ーホスファイト錯体｛例えば、Ｐｔ〔Ｐ（ＯＰｈ）_３〕_４、Ｐｔ〔Ｐ（ＯＢｕ）_３〕_４｝（式中、Ｍｅはメチル基、Ｂｕはブチル基、Ｖｉはビニル基、Ｐｈはフェニル基を表し、ｎ、ｍは整数を表す）、Ｐｔ（ａｃａｃ）_２、また、Ａｓｈｂｙらの米国特許第３１５９６０１及び３１５９６６２号明細書中に記載された白金−炭化水素複合体、並びにＬａｍｏｒｅａｕｘらの米国特許第３２２０９７２号明細書中に記載された白金アルコラ−ト触媒も挙げられる。
【００５０】
また、白金化合物以外の触媒の例としては、ＲｈＣｌ（ＰＰｈ_３）_３、ＲｈＣｌ_３、Ｒｈ／Ａｌ_２Ｏ_３、ＲｕＣｌ_３、ＩｒＣｌ_３、ＦｅＣｌ_３、ＡｌＣｌ_３、ＰｄＣｌ_２・２Ｈ_２Ｏ、ＮｉＣｌ_２、ＴｉＣｌ_４、等が挙げられる。これらの触媒は単独で使用してもよく、２種以上併用しても構わない。触媒活性の点から塩化白金酸、白金−オレフィン錯体、白金−ビニルシロキサン錯体、Ｐｔ（ａｃａｃ）_２等が好ましい。触媒量としては特に制限はないが、（Ａ）成分中のアルケニル基１ｍｏｌに対して１０^−１ｍｏｌ以上、１０^−８ｍｏｌ以下の範囲で用いるのがよい。好ましくは１０^−２ｍｏｌ以上、１０^−６ｍｏｌ以下の範囲で用いるのがよい。また、ヒドロシリル化触媒は、一般に高価で腐食性であり、また、水素ガスを大量に発生して硬化物が発泡してしまう場合があるので１０^−１ｍｏｌ以上用いない方がよい。
【００５１】
本発明の（Ｄ）成分の導電性付与剤としては、カーボンブラックや金属酸化物、金属微粉末、さらには、第４級アンモニウム塩、カルボン酸基、スルホン酸基、硫酸エステル基、リン酸エステル基などを有する有機化合物もしくは重合体、エーテルエステルイミド、もしくはエーテルイミド重合体、エチレンオキサイド−エピハロヒドリン共重合体、メトキシポリエチレングリコールアクリレートなどで代表される導電性ユニットを有する化合物、または高分子化合物などの帯電防止剤といった化合物などがあげられる。本発明における（Ｄ）成分は、単独で用いてもよく、２種以上を併用してもよい。上記カーボンブラックの例としては、ファーネスブラック、アセチレンブラック、ランプブラック、チャンネルブラック、サーマルブラック、オイルブラックなどがあげられる。これらカーボンブラックの種類、粒径等に制限はない。
【００５２】
（Ｄ）成分の添加量は、所望の導電特性に応じて調整して添加され、（Ａ）成分の重合体１００重量部に対し、０．０１重量部以上、１００重量部以下、さらには０．１重量部以上、５０重量部以下用いることが好ましい。添加量が少なすぎると、発現される導電付与能が不十分であり、また、添加量が多すぎると硬化性組成物の粘度の上昇が大きく作業性が悪くなる恐れがある。また、用いる導電性付与剤の種類あるいは添加量によっては、ヒドロシリル化反応を阻害するものがあるため、導電性付与物質のヒドロシリル化反応に対する影響を考慮しなければならない。
【００５３】
また、本発明における硬化性組成物には、各種充填剤、酸化防止剤、紫外線吸収剤、顔料などを適宜添加してよい。前記充填剤の具体例としては、特にシリカ微粉末、とりわけ比表面積が５０ｍ^２／ｇ以上、３８０ｍ^２／ｇ以下程度の微粉末シリカが好ましく、その中でも表面処理を施した疎水性シリカが、導電性弾性層の強度を好ましい方向に改善する働きが大きいので特に好ましい。
【００５４】
また、本発明における硬化性組成物には、粘度や硬度を調整する目的で軟化剤、可塑剤を添加してもよい。軟化剤、可塑剤の使用量は（Ａ）成分１００重量部に対して、１００重量部以下が好ましい。それ以上の添加量になると、ブリード等の問題を生じる可能性がある。
【００５５】
また、本発明における硬化性組成物には、組成物の貯蔵安定性を改良する目的で、貯蔵安定性改良剤を使用することができる。この貯蔵安定性改良剤としては、本発明の（Ｂ）成分の保存安定剤として知られている通常の安定剤であり、所期の目的を達成するものであればよく、特に限定されるものではない。具体的には、脂肪族不飽和結合を含有する化合物、有機リン化合物、有機硫黄化合物、窒素含有化合物、スズ系化合物、有機過酸化物等を好適に用いることができる。さらに具体的には、２−ベンゾチアゾリルサルファイド、ベンゾチアゾール、チアゾール、ジメチルアセチレンダイカルボキシレート、ジエチルアセチレンダイカルボキシレート、ブチルヒドロキシトルエン、ブチルヒドロキシアニソール、ビタミンＥ、２−（４−モルフォジニルジチオ）ベンゾチアゾール、３−メチル−１−ブテン−３−オール、アセチレン性不飽和基含有オルガノシロキサン、エチレン性不飽和基含有オルガノシロキサン、アセチレンアルコール、３−メチル−１−ブチル−３−オール、ジアリルフマレート、ジアリルマレエート、ジエチルフマレート、ジエチルマレエート、ジメチルマレート、２−ペンテンニトリル、２，３−ジクロロプロペン等が挙げられるが、これらに限定されるわけではない。
【００５６】
本発明における導電性ローラの導電性弾性層の形成方法は，特に限定されず、従来公知の各種ローラの成形方法を用いることができる。例えば、中心にＳＵＳ製などのシャフトを設置した金型に、組成物を押出成形、プレス成形、射出成形、反応射出成形（ＲＩＭ）、液状射出成形（ＬＩＭ）、注型成形などの各種成形法により成形し、適切な温度および時間で加熱硬化させてシャフトのまわりに導電性弾性層を成形する。ここで、本発明における導電性ローラの製造方法としては、導電性弾性層を形成するための導電性組成物が液状である場合、生産性、加工性の点で液状射出成形が好ましい。この場合、硬化性組成物は、半硬化させた後に、別途後硬化させるプロセスを設けて完全硬化させてもよい。
【００５７】
次に、本発明の導電性ローラにおいて、導電性弾性層の外周面上に形成される表面層について説明する。
【００５８】
表面層の材料としては、特に制限はないが、導電特性と耐摩耗性の観点からはウレタン結合を含有し、また柔軟性等の観点からはポリエーテル、ポリエステル、ポリカーボネート骨格を有する樹脂を主な組成とするウレタン樹脂組成物からなっていればよく、ウレタン樹脂と、ポリエーテル、ポリエステル、ポリカーボネートとのブレンド樹脂、１分子中にウレタン結合とポリエーテル、ポリエステル、ポリカーボネート、ポリシロキサンからなる群において選ばれる少なくとも１つの骨格を含有するウレタン樹脂組成物であってもよい。
【００５９】
また、表面層を構成する樹脂組成物には抵抗調整、表面形状の調整あるいは導電性弾性層に対する接着性等の観点から、導電性付与剤、各種フィラー等の各種添加剤を必要に応じて添加してもよい。
【００６０】
次に、本発明における表面層の形成方法について説明する。
【００６１】
本発明における表面層の形成方法としては特に制限はないが、プライマーによって表面処理された導電性弾性層の上から、表面層を構成する樹脂組成物をスプレー塗布、ディップ塗布、ロールコート等の方法を用いて所定の厚みに塗布し、所定の温度で乾燥、硬化させることにより、該導電性弾性層の表面層を形成することができる。具体的には、上記の表面層として使用される樹脂を溶剤に溶かして固形分を５％以上、２０％以下にしてスプレーあるいはディッピング塗布する方法が簡便である。使用する溶剤としては用いる表面層の主成分である樹脂が相溶すれば特に制限はなく、具体的には、メチルエチルケトン、酢酸ブチル、酢酸エチル、Ｎ，Ｎ−ジメチルホルムアミド、Ｎ，Ｎ−ジメチルアセトアミド、トルエン、プロピレングリコールメチルエーテルアセテート、プロピレングリコールメチルエーテル等が例示される。特に、ウレタン樹脂を用いて表面層を形成する場合、Ｎ，Ｎ−ジメチルホルムアミドやＮ，Ｎ−ジメチルアセトアミド、プロピレングリコールメチルエーテルが相溶性の観点から好ましい。ここで、表面層の乾燥温度としては、７０以上、２００℃以下が好ましい。乾燥温度が７０℃より低いと乾燥が不十分になる場合があり、２００℃より高いと、下層の導電性弾性層の劣化を招く恐れがある。また、表面層の厚さは、用いる材料、組成および用途などにより適切な値に設定するものであり、とくに限定されないが、通常１μｍ以上、１００μｍ以下が好ましい。１μｍより薄くなると耐磨耗性が低下し、長期間の耐久性が低下する傾向がある。また、１００μｍより厚いと、導電性弾性層との線膨張率の差に起因してしわが発生しやすくなるまたは圧縮歪みが大きくなるなどの問題が発生する傾向がある。
【００６２】
本発明においては、表面層溶液の被膜性を改善するために、レベリング剤等の各種添加剤を必要に応じて添加してもよい。本発明における導電性ローラは、必要に応じて、導電性弾性層の外側に１層以上の表面層を設けてもよい。
【００６３】
本発明の導電性ローラは、具体的には、例えば、電子写真装置用の帯電ローラ、現像ローラ、転写ローラ、給紙ローラ、クリーニングローラ、定着用の加圧ローラ、転写ドラム等に好適である。
【００６４】
【実施例】
以下の実施例に基づき本発明をさらに詳細に説明するが、本発明はこれらの実施例のみに限定されるものではない。
【００６５】
（製造例１）
（Ａ）成分としてのアリル末端ポリオキシプロピレン（商品名ＡＣＸ００４−Ｎ、鐘淵化学工業製）５００ｇに対して、（Ｄ）成分としてカーボンブラック＃３０３０Ｂ（三菱化学製）７０ｇを３本ロールで混練した混合物に、ついで、（Ｂ）成分としてポリオルガノハイドロジェンシロキサン（商品名ＡＣＸ００４−Ｃ、鐘淵化学工業製）を３３ｇ、（Ｃ）成分として、ビス（１，３−ジビニル−１，１，３，３−テトラメチルジシロキサン）白金錯体触媒（白金含有量３ｗｔ％、キシレン溶液）を３５０μＬ、そして貯蔵安定性改良剤としてジメチルマレートを１７０μＬ秤取し、均一混合した。該組成物を真空脱泡撹拌装置（シーテック（株）製）で９０分間脱泡を行ったあと、得られた導電性組成物をローラ成形用金型に射出圧１ＭＰａで注入し、１４０℃で３０分加熱の条件で直径８ｍｍのＳＵＳ製のシャフトの周りに厚さ４ｍｍの導電性弾性層を設けた導電性ローラを作成した。
【００６６】
（実施例１）
製造例１で得られた導電性弾性層ローラ表面上に、エポキシ基含有化合物および有機チタン化合物としてＭＥ１５１（ＧＥ東芝シリコーン製）を２０ｇを８０ｇのメチルエチルケトンに均一溶解させたプライマー溶液をスプレーで均一に塗布し、常温下で３０秒乾燥させ、表面処理を完了した。このように表面処理を施した導電性弾性層を有するローラに、ポリエーテル系ウレタン樹脂（商品名：ハイムレンＹ２５８）５０ｇをＮ，Ｎ−ジメチルホルムアミド４５０ｇに均一溶解した表面層塗布液をスプレー法によりコーティングし、１６０℃×９０分の条件で乾燥させ、導電性ローラを完成させた。
【００６７】
このようにして作成されたローラを、温度２０℃、相対湿度６０％の条件下で、２４時間養生した後に、ローラ表面をローラの軸方向まっすぐに幅１０ｍｍの切れ込みを入れ、表面層の伸びを抑制するため、表面上にテープを張り補強した。前述した１０ｍｍの切れ込みを軸方向に１０ｍｍ程度剥し、ローラ端部より５０ｍｍからローラ端部方向へ、引っ張り速度５０ｍｍ／ｍｉｎでの９０度ピール強度を導電性ローラ１本当たり端部と軸方向に逆側端部の２点ずつ測定し、導電性弾性層と表面層との密着性を導電性ローラ１０本の平均値にて評価した。評価結果を表１に示す。
【００６８】
（実施例２）
エポキシ基含有化合物としてＡ−１８７（日本ユニカー製）を４ｇ、および、有機チタン化合物としてテトラブトキシチタンを４ｇを２００ｇのメチルエチルケトンに均一溶解させたプライマー溶液を用いた以外は、実施例１と同様に導電性ローラを作成し、導電性弾性層と表面層との密着性評価を実施した。評価結果を表１に示す。
【００６９】
（比較例１）
実施例１記載と同処方のプライマー溶液を刷毛にて均一塗布し、常温下で３０秒乾燥させ表面処理した。後は実施例１と同様に導電性ローラを作成し、導電性弾性層と表面層との密着性評価を実施した。評価結果を表１に示す。
【００７０】
【表１】

【００７１】
以上に示したように、本発明により、導電性弾性層と表面層との密着性及び改善されることが明らかとなった。
【００７２】
【発明の効果】
本発明によれば、表面処理後の加熱をせずとも導電性弾性層と表面層間に強固な密着性を発現することが可能となる。
【図面の簡単な説明】
【図１】本発明の製造方法を用いて製造した導電性ローラを模式的に表した図
【符号の説明】
１ 表面層
２ 導電性弾性層
３ シャフト[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a conductive roller incorporated in an electrophotographic apparatus employing an electrophotographic process in an image forming apparatus such as a copying machine, a laser beam printer, or a facsimile receiving apparatus.
[0002]
[Prior art]
In a conductive roller composed of a shaft, a conductive elastic layer formed on the outer peripheral surface of the shaft, and one or more surface layers formed on the outer peripheral surface, the conductive roller includes friction or the like applied to the roller surface during use. It is indispensable that the conductive elastic layer and the surface layer have adhesion so that they do not peel off due to external force. However, the adhesion between the conductive elastic layer and the surface layer is often problematic, and there is a concern about quality risks, such as wrinkling due to insufficient conductive elastic layer and the surface layer.
[0003]
Among conductive rollers, a roller having an intermediate layer in order to improve the adhesion between the conductive elastic layer and the surface layer has been proposed (for example, Patent Documents 1 and 2). In this case, an intermediate layer is provided. As a result, it is necessary to adjust various characteristics (for example, electric resistance and the like) of the entire conductive roller, quality control becomes difficult, and it is necessary to provide a not necessarily simple process of providing a new layer. They had problems such as disadvantages.
[0004]
In addition, it is common practice to increase the adhesion by performing a primer treatment on the conductive elastic layer to improve the adhesion between the conductive elastic layer and the surface layer. As a general method of the primer treatment, there is a method in which a primer is applied with a brush or the like and heated. At this time, heating is a very important step because the components in the primer become reactive. However, adding a heating step increases the equipment cost.Because of the heating and cooling steps from primer treatment to coating the surface layer, it takes time to coat the surface layer, increasing the risk of contamination and increasing process control. There were problems such as difficulties and yield disadvantages.
[0005]
[Patent Document 1] Japanese Patent Application Laid-Open No. 10-333423
[Patent Document 2] Japanese Patent Application Laid-Open No. H11-38732
[Problems to be solved by the invention]
The present invention has been made in view of such a situation, and easily improves the adhesion between a conductive elastic layer of a conductive roller and a surface layer formed on the outer periphery thereof, and at the same time, improves the surface of the conductive roller. Is to prevent foreign matter from entering.
[0008]
[Means for Solving the Problems]
The present inventors have conducted intensive studies to solve the above-mentioned problems, and by performing primer treatment by spray spray on the conductive elastic layer, the conductive elastic layer and the surface layer can be applied without heating and drying after application. The inventors have found that high adhesion can be obtained, and have reached the present invention.
[0009]
That is, the present invention has a structure in which at least one conductive elastic layer made of a rubber elastic body and at least one surface layer made of a synthetic resin are laminated in this order around a shaft, and at the interface between the conductive elastic layer and the surface layer. A method for producing a conductive roller, wherein a primer is interposed, the primer is subjected to surface treatment on the conductive elastic layer by spraying, and then a solution obtained by diluting the surface layer constituting material with an organic solvent is coated. Was developed.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention has a structure in which at least one conductive elastic layer made of a rubber elastic body and at least one surface layer made of a synthetic resin are laminated in this order around a shaft, and a primer is provided at an interface between the conductive elastic layer and the surface layer. Wherein the primer is subjected to surface treatment on the conductive elastic layer by spraying, and then coated with a solution obtained by diluting the surface layer constituting material with an organic solvent. Things. According to this method, since the primer is applied by spraying, the primer treats the surface of the conductive elastic layer through fine droplets (mist), so that it does not need to be heated after the surface treatment. It is possible to develop a strong adhesive force. Further, since the heating step can be omitted, it is possible to suppress the risk of foreign matter adhering to the conductive elastic layer during the heating step. Also, unlike the brush coating method, since the conductive elastic layer is not directly touched during the surface treatment, it is possible to suppress the contamination of the conductive roller surface with foreign substances, leading to an improvement in yield and an advantage in terms of cost. Become.
[0011]
Further, the device for spraying the primer is preferably of a two-fluid type. By using a two-fluid type device, it becomes easy to discharge a small amount of the primer solution, and it is possible to reduce the adhesion of foreign substances to the conductive roller due to contamination of the surroundings by the sprayed mist.
[0012]
FIG. 1 shows a schematic view of one example of the conductive roller manufactured by the present manufacturing method. This conductive roller has a conductive elastic layer 2 formed on a shaft 3 and a surface layer 1 formed on the conductive elastic layer 2. In the present invention, after the conductive elastic layer 2 is formed, the surface treatment with the primer using a spray is performed, so that the adhesion between the conductive elastic layer and the surface layer is improved.
[0013]
The primer used in the present invention is preferably a primer capable of proceeding with moisture in the air. At this time, since the primer solution becomes a fine droplet state (mist) and absorbs moisture in the coating atmosphere, and the reaction of the primer proceeds by the moisture, the necessity of heating after the surface treatment can be further reduced. (It becomes easy to develop a strong adhesive force without heating). Therefore, the risk of foreign matter adhering to the conductive elastic layer during the heating step can be further suppressed.
[0014]
Further, it is preferable that the primer used in the present invention contains a component having a hydrolyzable silicon group. At this time, since the primer solution becomes a fine droplet state (mist) and absorbs moisture in the coating atmosphere, and the reaction of the primer proceeds by the moisture, the necessity of heating after the surface treatment can be further reduced. (It becomes easy to develop a strong adhesive force without heating). Therefore, the risk of foreign matter adhering to the conductive elastic layer during the heating step can be further suppressed.
[0015]
The primer used in the present invention preferably contains (I) an epoxy group-containing compound and (II) an organotitanium compound. The epoxy group-containing compound is not particularly limited as long as an epoxy group such as a glycidyl group, an alicyclic epoxy group, or an aliphatic epoxy group is present in the molecule, and an epoxy group and an organic titanium compound described below. Due to the interaction with the surface of the conductive elastic layer, the surface treatment of the conductive elastic layer is effectively performed, and a conductive roller having excellent adhesion to the surface layer can be obtained. At this time, the epoxy group and the organic titanium compound also interact with each other, so that the surface treatment can be more effectively performed. Here, from the viewpoint of interaction with the organic titanium compound, an epoxy group-containing compound having a hydrolyzable silicon group in the molecule can be suitably used as the epoxy group-containing compound. In this case, not only the epoxy group but also the hydrolyzable silicon group interacts with the organic titanium compound, and the surface of the conductive elastic layer can be more effectively treated.
[0016]
As the organic titanium compound, an organic titanium compound having a Ti—O—C bond is suitably used. As specific examples, in addition to tetraalkoxytitanium such as tetraisopropoxytitanium and tetrabutoxytitanium, general titanate coupling agents such as those having a residue such as oxyacetic acid and ethylene glycol can be used.
[0017]
As the primer used in the present invention, a silane coupling agent, a tackifier, a conductivity-imparting agent, organic fine particles, inorganic fine particles, and the like can be appropriately used as needed.
[0018]
Various organic solvents can be mixed with the primer used in the present invention. In particular, it is preferable to uniformly dissolve both substances (I) the epoxy group-containing compound and (II) the organic titanium compound. From the viewpoint of improving the properties, an organic solvent having high water absorption is preferably used. Specifically, methyl ethyl ketone, acetone, methyl isobutyl ketone, isopropanol, ethanol, methanol and the like can be preferably used. Further, depending on the coating environment, from the viewpoint of controlling the water absorption, it is also possible to use together with an organic solvent having a relatively low water absorption such as cyclohexane, hexane, benzene, toluene and xylene. A mixed solvent of methyl ethyl ketone, toluene and isopropanol is particularly preferred from the viewpoints of the volatility of the solvent used in the primer solution, water absorption and compatibility of the primer solids.
[0019]
The concentration of the primer solution can be used at an arbitrary concentration in consideration of the efficiency of the surface treatment and the viscosity on the apparatus.However, if the concentration is too high, the pot life is shortened and the viscosity increases, so the inside of the nozzle increases. Since there is a problem such as clogging with the solid content of the primer, it is preferable to use the solid content at 30% or less, more preferably at 10% or less. At this time, if the surface of the conductive roller after the surface treatment is uniformly dried, the presence or absence of heating is not particularly limited, but from the viewpoint of facilitating process management by reducing the cost of equipment and the risk of contamination of foreign substances. More preferably, it is performed without heating.
[0020]
In addition, the environment for the spray treatment of the primer is preferably 15 ° C. or higher and 40 ° C. or lower and an absolute humidity of 2 g / m ³ or higher and 20 g / m ³ or lower, more preferably 20 ° C. or higher and 35 ° C. or lower. The absolute humidity is preferably 4 g / m ³ or more and 15 g / m ³ or less. If the temperature is too low, the activity of the primer deteriorates and the adhesion decreases. If the temperature is too high, the organic solvent becomes too volatile after spraying, making it difficult to perform a uniform surface treatment. Also, if the absolute humidity is too low, the amount of moisture absorbed by the spray mist after spraying will be reduced, and the risk of adhesion will decrease because the reaction of the primer component will not have sufficient activity.If the absolute humidity is too high, The amount of moisture absorption becomes excessive, and foreign substances formed by the reaction of the primer components are generated.
[0021]
The spray amount of the primer solution in the present invention is preferably 1 ml / min or more and 40 ml / min or less, and more preferably 5 ml / min or more and 25 ml / min or less. If the spray amount is too large, the solution will sag on the surface of the conductive roller during drying, and a uniform adhesive force will not be produced.If the spray amount is too small, it will be sufficient to exert the adhesive force on the conductive roller surface. No amount of primer is coated. The distance between the spray nozzle and the conductive elastic layer at the time of spraying is not particularly limited as long as the surface of the conductive elastic layer is uniformly treated with a primer. The distance between the conductive elastic layers is preferably in the range of 5 mm or more and 50 mm or less.
[0022]
In the present invention, it is possible to improve the adhesion between the conductive elastic layer and the surface layer by a simple primer treatment method, and in particular, since the risk of adhesion of foreign matter on the conductive roller is reduced, In addition, since there is no need to form an intermediate layer or the like, quality control is easy and the cost is advantageous.
[0023]
Next, each layer constituting the conductive roller of the present invention will be described.
[0024]
As the shaft of the conductive roller of the present invention, stainless steel, iron plated or an aluminum shaft, a drum obtained by machining a cylindrical aluminum tube by machining, or a stainless plate made by bending a stainless plate into a cylindrical shape. An example of a seamless roll obtained by welding these connecting portions by laser processing can be given. The function required for the shaft is to support the conductive elastic layer and the surface layer and maintain a predetermined shape, and by machining such as lathing and polishing, and shaping such as drawing and drawing, As long as the material can be easily processed, the material and the processing method are not limited. If the conductive elastic layer and the surface layer can be supported and a predetermined shape can be maintained, it is possible to use a shaftless type.
[0025]
Next, the conductive elastic layer in the conductive roller of the present invention will be described. As the material of the conductive elastic layer in the present invention, those generally widely known as a conductive elastic layer material of a conductive roller can be used.
(A) an oxypropylene polymer having at least one hydrosilyl-reactive alkenyl group in the molecule; (B) a compound having at least two hydrosilyl groups in the molecule; (C) a hydrosilylation catalyst; Rubber materials obtained by curing a curable composition containing a imparting agent as an essential component are exemplified. By curing the curable composition around the shaft, a suitable conductive elastic layer can be obtained. Here, the polymer of the component (A) is a component which is cured by a hydrosilylation reaction with the component (B) in the presence of the component (C), and has at least one alkenyl group in the molecule. The reaction takes place to polymerize and harden. The curable composition is a low-viscosity liquid before curing, and has excellent curability because of utilizing a hydrosilylation reaction, and is more preferable in terms of productivity and processability. The temperature at which the curable composition is thermally cured is preferably in the range of 80 ° C to 180 ° C. When the temperature is 80 ° C. or higher, the hydrosilylation reaction proceeds rapidly, and curing can be performed in a short time.
[0026]
Here, the alkenyl group in the component (A) is not particularly limited as long as it is a group containing a carbon-carbon double bond that is active in a hydrosilylation reaction. , Allyl group, methylvinyl group, propenyl group, butenyl group, pentenyl group, hexenyl group, etc., aliphatic unsaturated hydrocarbon group, cyclopropenyl group, cyclobutenyl group, cyclopentenyl group, cyclohexenyl group, etc. Examples include a hydrogen group and a methacryl group. The number of alkenyl groups of the oxypropylene-based polymer is at least one for the hydrosilylation reaction with the component (B) as a curing agent, but from the viewpoint of obtaining good rubber elasticity, the number of In such a case, the molecule preferably has two alkenyl groups at both ends of the molecule, and in the case of a branched molecule, it preferably has two or more alkenyl groups at the molecular end. The component (A) in the present invention desirably has the alkenyl group capable of undergoing a hydrosilylation reaction introduced at the polymer terminal. When the alkenyl group is at the terminal of the polymer as described above, it is preferable in that the rubber conductive elastic layer of the roller can be easily set to have a low hardness and the strength can be easily increased.
[0027]
The oxypropylene-based polymer of the component (A) refers to a polymer in which more than 50% of the repeating units constituting the main chain are composed of oxypropylene units. A compound having two or more active hydrogens, such as a unit derived from ethylene glycol, propylene glycol, a bisphenol compound, glycerin, trimethylolpropane, pentaerythritol, etc., and ethylene oxide, butylene It may be a copolymerizable unit composed of an oxide or the like.
[0028]
The molecular weight of the oxypropylene-based polymer is preferably from 1,000 to 50,000 in number average molecular weight (Mn). When the number average molecular weight is less than 1000, it is difficult to obtain sufficient mechanical properties (rubber hardness, elongation) and the like when the curable composition is cured. On the other hand, if the number average molecular weight is too large, the molecular weight per alkenyl group contained in the molecule will be large, or the reactivity will decrease due to steric hindrance, so curing is often insufficient, Further, the viscosity tends to be too high and the processability tends to be poor.
[0029]
The component (B) in the present invention is used as a curing agent, and is not limited as long as it contains two or more silicon-bonded hydrogen atoms in the molecule. Here, the hydrosilyl group represents a group having a Si—H bond. In the present invention, when two hydrogen atoms (H) are bonded to the same silicon atom (Si), two hydrosilyl groups are used. calculate.
[0030]
As the component (B), polyorganohydrogensiloxane is one of preferred examples. The term "polyorganohydrogensiloxane" used herein refers to a siloxane compound having a hydrocarbon group or a hydrogen atom on a silicon atom. To show the structure specifically,
[0031]
Embedded image

[0032]
(2 <m + n ≦ 50, 2 <m, 0 ≦ n, where R is a hydrocarbon having 2 to 20 carbon atoms in the main chain and may contain one or more phenyl groups.)
[0033]
Embedded image

[0034]
(0 <m + n ≦ 50, 0 <m, 0 ≦ n, where R is a hydrocarbon having 2 to 20 carbon atoms in the main chain and may contain one or more phenyl groups.)
[0035]
Embedded image

[0036]
(3.ltoreq.m + n.ltoreq.20, 2 <m.ltoreq.19, 0.ltoreq.n <18, R may be a hydrocarbon having 2 to 20 carbon atoms in the main chain and may contain one or more phenyl groups.)
Or a chain or ring represented by, for example, or two or more of these units.
Embedded image

[0038]
(1 ≦ m + n ≦ 50, 1 ≦ m, 0 ≦ n, R is a hydrocarbon having a main chain of 2 to 20 carbon atoms and may contain one or more phenyl groups. 2 ≦ l, R ² Is a divalent to tetravalent organic group, and R ¹ is a divalent organic group, provided that R ¹ does not have to depend on the structure of R ^2. )
[0039]
Embedded image

[0040]
(0 ≦ m + n ≦ 50, 0 ≦ m, 0 ≦ n, R is a hydrocarbon having 2 to 20 carbon atoms in the main chain and may contain one or more phenyl groups. 2 ≦ l, R ² Is a divalent or tetravalent organic group, and R ¹ is a divalent organic group, provided that R ¹ may not be dependent on the structure of R ^2. )
[0041]
Embedded image

[0042]
(3 ≦ m + n ≦ 50, 1 ≦ m, 0 ≦ n, where R is a hydrocarbon having 2 to 20 carbon atoms in the main chain and may contain one or more phenyl groups. 2 ≦ l, R ² Is a divalent or tetravalent organic group, and R ¹ is a divalent organic group, provided that R ¹ may not be dependent on the structure of R ^2. )
And the like.
[0043]
In using these components (B), those having good compatibility with the components (A), (C) and (D), or dispersion stability in the system are preferred. In particular, when the viscosity of the entire system is low, when a component having low compatibility with the above components is used as the component (B), phase separation may occur and poor curing may be caused. Further, a filler having a small particle size such as finely divided silica may be blended as a dispersing aid.
When the compatibility with the component (A), the component (C), and the component (D) or the dispersion stability is specifically shown as being relatively good,
[0044]
Embedded image

[0045]
(N is 6 to 12)
[0046]
Embedded image

[0047]
(2 <k <35, 0 <l <10, R is a hydrocarbon group having 8 or more carbon atoms)
And the like.
[0048]
The amount of the component (B) used in the present invention is such that the silicon-bonded hydrogen atom of the component (B) is at least 0.8 equivalent and at most 5.0 equivalent to the total amount of the alkenyl groups of the (A) component. It is preferable to use it. When the silicon-bonded hydrogen atoms of the component (B) are less than 0.8 equivalents relative to the total amount of the alkenyl groups of the component (A), crosslinking may be insufficient. If it exceeds 5.0 equivalents, there is a problem that physical properties are greatly changed due to the influence of silicon-bonded hydrogen atoms remaining after curing. In particular, when it is desired to suppress this effect, it is preferable to use the component (B) in an amount of 1.0 equivalent or more and 2.0 equivalents or less.
[0049]
There is no particular limitation on the hydrosilylation catalyst which is the component (C) of the present invention, and any catalyst can be used. Specifically, solid platinum is supported on a carrier such as chloroplatinic acid, platinum alone, alumina, silica, and carbon black; a platinum-vinylsiloxane complex {for example, Pt _n (ViMe ₂ SiOSiMe ₂₎ Vi) _n , Pt [(MeViSiO) ₄ ] _m {; platinum-phosphine complex {eg, Pt (PPh ₃ ) ₄ , Pt (PBu ₃ ) ₄ }; platinum-phosphite complex {eg, Pt [P (OPh) ₃ ] ₄ , Pt [P (OBu) ₃ ] ₄ } (where Me is a methyl group, Bu is a butyl group, Vi is a vinyl group, Ph is a phenyl group, n and m are integers), Pt (acac) _2, also, platinum described in U.S. Patent 3,159,601 and in Pat 3159662 of Ashby et al - hydrocarbon complex, and Lamoreaux et al U.S. Patent Platinum is described in the 3220972 Pat Arcola - DOO catalysts may be mentioned.
[0050]
Examples of catalysts other than platinum compounds include RhCl (PPh ₃ ) ₃ , RhCl ₃ , Rh / Al ₂ O ₃ , RuCl ₃ , IrCl ₃ , FeCl ₃ , AlCl ₃ , PdCl ₂ .2H ₂ O, NiCl ₂ , TiCl ₄ , and the like. These catalysts may be used alone or in combination of two or more. From the viewpoint of catalytic activity, chloroplatinic acid, platinum-olefin complex, platinum-vinylsiloxane complex, Pt (acac) _{2 and the} like are preferable. The amount of the catalyst is not particularly limited, but is preferably in the range of 10 ^-1 mol or more and 10 ^-8 mol or less based on 1 mol of the alkenyl group in the component (A). Preferably, it is used in the range of 10 ⁻² mol or more and 10 ⁻⁶ mol or less. Further, the hydrosilylation catalyst is generally expensive and corrosive, and a large amount of hydrogen gas may be generated to foam a cured product. Therefore, it is better not to use the hydrosilylation catalyst in an amount of 10 ^-1 mol or more.
[0051]
Examples of the conductivity imparting agent of the component (D) of the present invention include carbon black, metal oxides, metal fine powders, quaternary ammonium salts, carboxylic acid groups, sulfonic acid groups, sulfate groups, and phosphate esters. Organic compound or polymer having a group or the like, ether ester imide or ether imide polymer, ethylene oxide-epihalohydrin copolymer, a compound having a conductive unit represented by methoxypolyethylene glycol acrylate, or a high molecular compound Examples include compounds such as antistatic agents. The component (D) in the present invention may be used alone or in combination of two or more. Examples of the carbon black include furnace black, acetylene black, lamp black, channel black, thermal black, oil black, and the like. There is no limitation on the type, particle size, etc. of these carbon blacks.
[0052]
The addition amount of the component (D) is adjusted and added according to desired conductive properties, and is 0.01 to 100 parts by weight, more preferably 0 to 100 parts by weight, based on 100 parts by weight of the polymer of the component (A). It is preferable to use not less than 1 part by weight and not more than 50 parts by weight. If the addition amount is too small, the ability to impart conductivity is insufficient, and if the addition amount is too large, the viscosity of the curable composition may increase so much that the workability may deteriorate. In addition, depending on the type or the amount of the conductivity-imparting agent used, the hydrosilylation reaction may be inhibited. Therefore, it is necessary to consider the effect of the conductivity-imparting substance on the hydrosilylation reaction.
[0053]
Moreover, various fillers, antioxidants, ultraviolet absorbers, pigments, and the like may be appropriately added to the curable composition of the present invention. As a specific example of the filler, silica fine powder, particularly fine powder silica having a specific surface area of about 50 m ² / g or more and about 380 m ² / g or less is preferable. This is particularly preferable because the effect of improving the strength of the elastic elastic layer in a preferable direction is large.
[0054]
Further, a softener or a plasticizer may be added to the curable composition of the present invention for the purpose of adjusting the viscosity or hardness. The amount of the softener and the plasticizer is preferably 100 parts by weight or less based on 100 parts by weight of the component (A). If the addition amount exceeds that, there is a possibility that a problem such as bleeding may occur.
[0055]
In addition, a storage stability improver can be used in the curable composition of the present invention for the purpose of improving the storage stability of the composition. The storage stability improver is a usual stabilizer known as a storage stabilizer of the component (B) of the present invention, and may be any as long as it achieves the intended purpose, and is particularly limited. is not. Specifically, a compound containing an aliphatic unsaturated bond, an organic phosphorus compound, an organic sulfur compound, a nitrogen-containing compound, a tin compound, an organic peroxide, or the like can be suitably used. More specifically, 2-benzothiazolyl sulfide, benzothiazole, thiazole, dimethylacetylene dicarboxylate, diethylacetylene dicarboxylate, butylhydroxytoluene, butylhydroxyanisole, vitamin E, 2- (4-morphodinyl Dithio) benzothiazole, 3-methyl-1-buten-3-ol, an acetylenically unsaturated group-containing organosiloxane, an ethylenically unsaturated group-containing organosiloxane, acetylene alcohol, 3-methyl-1-butyl-3-ol, Examples include, but are not limited to, diallyl fumarate, diallyl maleate, diethyl fumarate, diethyl maleate, dimethyl maleate, 2-pentenenitrile, 2,3-dichloropropene, and the like.
[0056]
The method for forming the conductive elastic layer of the conductive roller in the present invention is not particularly limited, and any conventionally known roller forming method can be used. For example, various molding methods such as extrusion molding, press molding, injection molding, reaction injection molding (RIM), liquid injection molding (LIM), casting molding, etc., are carried out in a mold having a shaft made of SUS or the like at the center. And heat-curing at an appropriate temperature and time to form a conductive elastic layer around the shaft. Here, as a method of manufacturing the conductive roller in the present invention, when the conductive composition for forming the conductive elastic layer is in a liquid form, liquid injection molding is preferable in terms of productivity and workability. In this case, the curable composition may be completely cured by providing a separate post-curing process after semi-curing.
[0057]
Next, the surface layer formed on the outer peripheral surface of the conductive elastic layer in the conductive roller of the present invention will be described.
[0058]
The material of the surface layer is not particularly limited, but contains a urethane bond from the viewpoint of conductive properties and abrasion resistance, and mainly includes a resin having a polyether, polyester, or polycarbonate skeleton from the viewpoint of flexibility and the like. The urethane resin may be composed of a urethane resin, a polyether, a polyester, a blend resin of a polycarbonate, and a urethane bond and a polyether, a polyester, a polycarbonate, and a polysiloxane in one molecule. It may be a urethane resin composition containing at least one skeleton.
[0059]
In addition, various additives such as a conductivity-imparting agent and various fillers are added to the resin composition constituting the surface layer as necessary from the viewpoints of resistance adjustment, surface shape adjustment, and adhesion to the conductive elastic layer. May be.
[0060]
Next, a method for forming a surface layer in the present invention will be described.
[0061]
The method for forming the surface layer in the present invention is not particularly limited, but a method such as spray coating, dip coating, roll coating, etc. of the resin composition constituting the surface layer on the conductive elastic layer surface-treated with the primer. Is applied to a predetermined thickness, and dried and cured at a predetermined temperature, whereby the surface layer of the conductive elastic layer can be formed. Specifically, a method of dissolving the resin used as the surface layer in a solvent to have a solid content of 5% or more and 20% or less and spraying or dipping is simple. The solvent used is not particularly limited as long as the resin which is the main component of the surface layer used is compatible. Specifically, methyl ethyl ketone, butyl acetate, ethyl acetate, N, N-dimethylformamide, N, N-dimethylacetamide , Toluene, propylene glycol methyl ether acetate, propylene glycol methyl ether and the like. In particular, when the surface layer is formed using a urethane resin, N, N-dimethylformamide, N, N-dimethylacetamide, and propylene glycol methyl ether are preferred from the viewpoint of compatibility. Here, the drying temperature of the surface layer is preferably 70 or more and 200 ° C. or less. If the drying temperature is lower than 70 ° C., the drying may be insufficient. If the drying temperature is higher than 200 ° C., the lower conductive elastic layer may be deteriorated. The thickness of the surface layer is set to an appropriate value depending on the material, composition, application, and the like to be used, and is not particularly limited, but is usually preferably 1 μm or more and 100 μm or less. When the thickness is less than 1 μm, abrasion resistance tends to decrease, and long-term durability tends to decrease. On the other hand, when the thickness is more than 100 μm, there is a tendency that wrinkles are easily generated or a compressive strain is increased due to a difference in linear expansion coefficient between the conductive elastic layer and the conductive elastic layer.
[0062]
In the present invention, various additives such as a leveling agent may be added as necessary in order to improve the film property of the surface layer solution. The conductive roller in the present invention may have one or more surface layers outside the conductive elastic layer, if necessary.
[0063]
The conductive roller of the present invention is specifically suitable for, for example, a charging roller for an electrophotographic apparatus, a developing roller, a transfer roller, a paper feed roller, a cleaning roller, a pressure roller for fixing, a transfer drum, and the like. .
[0064]
【Example】
The present invention will be described in more detail based on the following examples, but the present invention is not limited to only these examples.
[0065]
(Production Example 1)
To 500 g of allyl-terminated polyoxypropylene (trade name: ACX004-N, manufactured by Kanegafuchi Chemical Industry Co., Ltd.) as the component (A), kneading 70 g of carbon black # 3030B (manufactured by Mitsubishi Chemical) as the component (D) using a three-roll mill. Then, 33 g of polyorganohydrogensiloxane (trade name ACX004-C, manufactured by Kaneka Corporation) as the component (B) and bis (1,3-divinyl-1,1,1) as the component (C) were added to the mixture. 350 μL of 3,3-tetramethyldisiloxane) platinum complex catalyst (platinum content: 3 wt%, xylene solution) and 170 μL of dimethyl malate as a storage stability improver were weighed and uniformly mixed. After defoaming the composition for 90 minutes using a vacuum defoaming stirrer (manufactured by C-Tech Co., Ltd.), the obtained conductive composition was injected into a roller molding die at an injection pressure of 1 MPa, and heated at 140 ° C. Under a condition of heating for 30 minutes, a conductive roller having a conductive elastic layer having a thickness of 4 mm provided around a SUS shaft having a diameter of 8 mm was prepared.
[0066]
(Example 1)
A primer solution obtained by uniformly dissolving 20 g of ME151 (manufactured by GE Toshiba Silicone) as an epoxy group-containing compound and an organic titanium compound in 80 g of methyl ethyl ketone was sprayed on the surface of the conductive elastic layer roller obtained in Production Example 1 by spraying. It was applied and dried at room temperature for 30 seconds to complete the surface treatment. The roller having the conductive elastic layer subjected to the surface treatment as described above is sprayed with a surface layer coating solution obtained by uniformly dissolving 50 g of a polyether-based urethane resin (trade name: Heimlen Y258) in 450 g of N, N-dimethylformamide. Coating and drying were performed at 160 ° C. for 90 minutes to complete a conductive roller.
[0067]
After curing the roller thus prepared at a temperature of 20 ° C. and a relative humidity of 60% for 24 hours, a 10 mm wide cut is made in the roller surface straight in the axial direction of the roller to reduce the elongation of the surface layer. To control, tape was reinforced on the surface and reinforced. The above-mentioned 10 mm notch is peeled off by about 10 mm in the axial direction, and the 90 degree peel strength at a pulling speed of 50 mm / min from the roller end toward the roller end is reversed in the axial direction with respect to the end per conductive roller. The measurement was performed at two points at the side end, and the adhesion between the conductive elastic layer and the surface layer was evaluated by the average value of 10 conductive rollers. Table 1 shows the evaluation results.
[0068]
(Example 2)
Except for using a primer solution obtained by uniformly dissolving 4 g of A-187 (manufactured by Nippon Unicar) as an epoxy group-containing compound and 4 g of tetrabutoxytitanium as an organic titanium compound in 200 g of methyl ethyl ketone, the same procedure as in Example 1 was used. A conductive roller was prepared, and the adhesion between the conductive elastic layer and the surface layer was evaluated. Table 1 shows the evaluation results.
[0069]
(Comparative Example 1)
A primer solution having the same formulation as described in Example 1 was uniformly applied with a brush, dried at room temperature for 30 seconds, and surface-treated. Thereafter, a conductive roller was prepared in the same manner as in Example 1, and the adhesion between the conductive elastic layer and the surface layer was evaluated. Table 1 shows the evaluation results.
[0070]
[Table 1]

[0071]
As described above, it has been clarified that the adhesion between the conductive elastic layer and the surface layer is improved and improved by the present invention.
[0072]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to express strong adhesiveness between a conductive elastic layer and a surface layer without heating after surface treatment.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing a conductive roller manufactured by using the manufacturing method of the present invention.
Reference Signs List 1 surface layer 2 conductive elastic layer 3 shaft

Claims (12)

Around the shaft, at least one conductive elastic layer made of a rubber elastic body and at least one surface layer made of a synthetic resin are laminated in this order, and a primer is interposed at an interface between the conductive elastic layer and the surface layer. A method for producing a conductive roller, comprising: applying a surface treatment to the conductive elastic layer with the primer by spraying; and coating a solution obtained by diluting the surface layer constituting material with an organic solvent. The method for producing a conductive roller according to claim 1, wherein the primer is a primer whose reaction can proceed by moisture in the air. The method for producing a conductive roller according to claim 1 or 2, wherein the primer contains a component having a hydrolyzable silicon group. The method for producing a conductive roller according to any one of claims 1 to 3, wherein the primer contains the following components (I) and (II) as essential components.
(I) Epoxy group-containing compound (II) Organotitanium compound The conductive material according to any one of claims 1 to 4, wherein the primer contains at least one selected from the group consisting of methyl ethyl ketone, acetone, methyl isobutyl ketone, isopropanol, ethanol, and methanol as an organic solvent. Roller manufacturing method. The method for producing a conductive roller according to claim 5, wherein the primer further contains at least one selected from cyclohexane, hexane, benzene, toluene, and xylene as an organic solvent. The method for producing a conductive roller according to any one of claims 1 to 6, wherein an apparatus for spraying the primer is a two-fluid type. 8. The conductive roller according to claim 4, wherein when the primer is sprayed, the content of the components (I) and (II) in the primer is 30% or less. 9. Production method. The method according to any one of claims 1 to 8, wherein a flow rate of the primer solution is 1 ml / min or more and 40 ml / min or less when the primer is sprayed. The environment for spraying the primer is 15 ° C. or more and 40 ° C. or less and the absolute humidity is 2 g / m ³ or more and 20 g / m ³ , according to any one of claims 1 to 9, wherein A method for producing the conductive roller according to the above. The conductive elastic layer according to any one of claims 1 to 10, wherein the conductive elastic layer is a cured product of a conductive composition containing the following components (A) to (D) as essential components. Roller manufacturing method.
(A) an oxypropylene polymer having at least one hydrosilyl-reactive alkenyl group in the molecule (B) a compound having at least two hydrosilyl groups in the molecule (C) a hydrosilylation catalyst (D) Granting agent The method according to any one of claims 1 to 11, wherein the synthetic resin forming the surface layer has a polyurethane-based resin as a main component.

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