JP2021086056A - 電子写真機器用現像ロール - Google Patents
電子写真機器用現像ロール Download PDFInfo
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- JP2021086056A JP2021086056A JP2019216100A JP2019216100A JP2021086056A JP 2021086056 A JP2021086056 A JP 2021086056A JP 2019216100 A JP2019216100 A JP 2019216100A JP 2019216100 A JP2019216100 A JP 2019216100A JP 2021086056 A JP2021086056 A JP 2021086056A
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Images
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
- G03G15/0808—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the developer supplying means, e.g. structure of developer supply roller
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
- G03G15/0818—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the structure of the donor member, e.g. surface properties
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dry Development In Electrophotography (AREA)
Abstract
Description
導電性シリコーンゴム(信越化学工業社製、「X−34−264A/B、混合質量比A/B=1/1」)をスタティックミキサーにて混合することにより、弾性体層用組成物を調製した。
軸体として直径6mmの中実円柱状の鉄棒を準備し、その外周面に接着剤を塗布した。この軸体をロール成形用金型の中空空間にセットした後、調製した弾性体層用組成物を中空空間内に注入し、190℃で30分間加熱して硬化させ、脱型した。これにより、軸体の外周面に沿って導電性シリコーンゴムよりなるロール状の弾性体層(厚さ3mm)を形成した。
熱可塑性ポリウレタン(東ソー社製、「ニッポラン5199」)10質量部と、ポリエーテルジオール(2官能ポリプロピレングリコール)(ADEKA社製、「アデカポリエーテルP−1000」)60質量部と、ポリイソシアネート(へキサメチレンジイソシアネート3量体)(東ソー社製、「コロネートHX」)30質量部と、電子導電剤(カーボンブラック)(ライオン社製、「ケッチェンEC300J」)3質量部と、イオン導電剤(テトラメチルアンモニウムクロリド)(東京化成工業社製)0.5質量部とを固形分濃度20質量%となるようにMEKに溶解し、三本ロールを用いて十分に混合、分散させた。調製した表層用組成物を弾性体層の外周面上にロールコートし、熱処理を施すことにより、弾性体層の外周面上に表層(厚さ15μm)を形成した。
表に記載の配合(質量部)となるように各成分を配合し、固形分濃度25質量%となるように希釈溶媒(MIBK)で濃度調整し、端部保護層用組成物を調製した。次いで、端部保護層用組成物を表層の外周面上で軸方向の両端部(非画像形成領域)にロールコートし、熱処理を施すことにより、表層の外周面上で軸方向の両端部に端部保護層(厚さ1μm)を形成した。以上により、現像ロールを作製した。
・熱可塑性ポリウレタン:日本ポリウレタン工業製「ニッポラン5196」
・PPG系ポリオール:アデカ製「アデカポリエーテルP1000」
・TDI系イソシアネート:東ソー製「コロネートL」
・表面改質剤<1>:フッ素系(シアノ基有り)、東亞合成製「アロンGF400」
・表面改質剤<2>:シリコーン系(シアノ基有り)、合成品A
・表面改質剤<3>:フッ素系(シアノ基無し)、DIC製「メガファックF553」
・表面改質剤<4>:フッ素系(シアノ基無し)、DIC製「メガファックF561」
・表面改質剤<5>:シリコーン系(シアノ基無し)、東亞合成製「サイマックUS−270」
・熱伝導性フィラー<1>:酸化アルミニウム、昭和電工製「AL−160SG−3」
・熱伝導性フィラー<2>:酸化マグネシウム、協和化学工業製「キューワマグ MF30」
100mLの反応フラスコに、メタクリル酸メチル(試薬)9.98g(98.64mmol)、アクリレート変性シリコーンオイル(信越化学工業製「X‐22‐174DX」)1.66g(0.36mmol)、メタクリロニトリル(試薬)0.07g(1mmol)、ジメチル1,1’−アゾビス(1−シクロヘキサンカルボキシレート)(和光純薬工業製「VE−73」)1.24g(4mmol)及びMEK10.50gを仕込み、撹拌しながら5分間窒素バブリングを行った後、内液の温度80℃にて7時間重合させた。その後、MEK19.45gを仕込み固形分30%の表面改質剤<2>(合成品A)を得た。
作製した現像ロールを、HH環境(32.5℃×85%RH)で4時間養生した後、市販のカラーレーザープリンター(ブラザー工業製「HL-L9319CDW」)に組み込み、ベタ白画像を1,000枚連続印字した後、ロール端部を観察した。ロール端部からトナーが漏れていなければ、引き続き、ベタ白画像を1,000枚連続印字し、ロール端部を観察した。これをロール端部からトナーが漏れるまで繰り返し、トナー漏れまでの耐久枚数を調べた。
作製した現像ロールに電源(アンプ)から電圧(1,000μA)を印加し、印加停止して5秒後の端部保護層における残電荷量を表面電位計で測定した。
端部保護層用組成物を離型PET上にバーコートし、熱処理することにより成膜した(厚さ15〜30μm)。得られた膜を離型PETから剥がし、評価シートサンプルとした。電気抵抗率計(測定レンジ104〜1018Ω)(ケスレーインスツルメンツ製、「6517B型エレクトロメーター」)を用い、JIS−K6911に準拠し、評価シートサンプルに印加電圧500Vを印加したときの体積抵抗率(Ω・cm)を測定した。
12 軸体
14 弾性体層
16 表層
18 端部保護層
Claims (6)
- 軸体と、前記軸体の外周面上に形成された弾性体層と、前記弾性体層の外周面上に形成された表層と、前記表層の外周面上で軸方向の両端部に形成された端部保護層と、を備え、
前記端部保護層が、バインダーポリマーと、シアノ基を有する表面改質剤と、を含有することを特徴とする電子写真機器用現像ロール。 - 前記シアノ基を有する表面改質剤が、フッ素系の表面改質剤であることを特徴とする請求項1に記載の電子写真機器用現像ロール。
- 前記シアノ基を有する表面改質剤の含有量が、前記バインダーポリマー100質量部に対し、0.1〜20質量部の範囲内であることを特徴とする請求項1または2に記載の電子写真機器用現像ロール。
- 前記バインダーポリマーが、ポリウレタンであることを特徴とする請求項1から3のいずれか1項に記載の電子写真機器用現像ロール。
- 前記端部保護層が、さらに熱伝導性材料を含有することを特徴とする請求項1から4のいずれか1項に記載の電子写真機器用現像ロール。
- 前記熱伝導性材料が、アルミナ粒子であることを特徴とする請求項5に記載の電子写真機器用現像ロール。
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