JP4434178B2 - 非磁性一成分静電潜像現像方法、画像形成方法及び画像形成装置とそれに用いられるトナー - Google Patents
非磁性一成分静電潜像現像方法、画像形成方法及び画像形成装置とそれに用いられるトナー Download PDFInfo
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- JP4434178B2 JP4434178B2 JP2006147819A JP2006147819A JP4434178B2 JP 4434178 B2 JP4434178 B2 JP 4434178B2 JP 2006147819 A JP2006147819 A JP 2006147819A JP 2006147819 A JP2006147819 A JP 2006147819A JP 4434178 B2 JP4434178 B2 JP 4434178B2
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- Developing Agents For Electrophotography (AREA)
Description
トナー搬送部材、トナー層規制部材及びトナー補給補助部材を備え、且つトナー補給補助部材とトナー搬送部材、及びトナー層規制部材とトナー搬送部材がそれぞれ当接している現像装置を用いて薄層化させた非磁性トナーを静電潜像形成体表面に供給して潜像を現像する非磁性一成分静電潜像現像方法において、少なくとも樹脂粒子を水系媒体中で会合させてなる、形状係数1.2〜1.6の範囲にあるトナー粒子が65個数%以上であり、形状係数の変動係数が16%以下で、かつ、該トナー粒子の粒径をD(μm)とするとき、自然対数lnDを横軸にとり、この横軸を0.23間隔で複数の階級に分けた個数基準の粒度分布を示すヒストグラムにおける、最頻階級に含まれるトナー粒子の相対度数(m1)と、前記最頻階級の次に頻度の高い階級に含まれるトナー粒子の相対度数(m2)との和(M)が70%以上であるトナーを用いることを特徴とする非磁性一成分静電潜像現像方法。
(1)に記載の非磁性一成分静電潜像現像方法を用い、潜像形成、現像、転写、定着の工程を経ることを特徴とする画像形成方法。
使用されるトナーが、下記定義による角がないトナー粒子を50個数%以上含有することを特徴とする(2)に記載の画像形成方法。
(角がないトナー)
トナー粒子の長径をL、L/10を半径Rとする円で、トナー粒子周囲線に対し1点で内側に接しつつ内側をころがした場合に、全く円がトナーの外側に実質的にはみださない場合を角がないトナー粒子という。実質的にはみ出さない場合とは、はみ出す円が存在する突起が1箇所以下をいう。また、トナー粒子の長径とは、トナー粒子の平面上への投影像を2本の平行線ではさんだとき、その平行線の間隔が最大となる粒子の幅をいう。
使用されるトナーの個数平均粒径が3〜8μmであることを特徴とする(2)又は(3)に記載の画像形成方法。
使用されるトナーが、少なくとも重合性単量体を水系媒体中で重合せしめて得られた樹脂粒子を、水系媒体中で会合させて造られることを特徴とする(2)〜(4)の何れか1項に記載の画像形成方法。
(1)に記載の非磁性一成分静電潜像現像方法を用い、潜像形成、現像、転写、定着の工程を有することを特徴とする画像形成装置。
トナー搬送部材、トナー層規制部材及びトナー補給補助部材を備え、且つトナー補給補助部材とトナー搬送部材、及びトナー層規制部材とトナー搬送部材がそれぞれ当接している現像装置を用いて薄層化させた非磁性トナーを静電潜像形成体表面に供給して潜像を現像する非磁性一成分静電潜像現像方法に用いられるトナーにおいて、少なくとも樹脂粒子を水系媒体中で会合させてなる、形状係数1.2〜1.6の範囲にあるトナー粒子が65個数%以上であり、形状係数の変動係数が16%以下で、かつ、該トナー粒子の粒径をD(μm)とするとき、自然対数lnDを横軸にとり、この横軸を0.23間隔で複数の階級に分けた個数基準の粒度分布を示すヒストグラムにおける、最頻階級に含まれるトナー粒子の相対度数(m1)と、前記最頻階級の次に頻度の高い階級に含まれるトナー粒子の相対度数(m2)との和(M)が70%以上である、トナーを用いることを特徴とするトナー。
ここに、最大径とは、トナー粒子の平面上への投影像を2本の平行線ではさんだとき、その平行線の間隔が最大となる粒子の幅をいう。また、投影面積とは、トナー粒子の平面上への投影像の面積をいう。
式中、Sは100個のトナー粒子の形状係数の標準偏差を示し、Kは形状係数の平均値を示す。
式中、Sは個数粒度分布における標準偏差を示し、Dnは個数平均粒径(μm)を示す。
(1)アパーチャー:100μm
(2)サンプル調製法:電解液〔ISOTON R−11(コールターサイエンティフィックジャパン社製)〕50〜100mlに界面活性剤(中性洗剤)を適量加えて攪拌し、これに測定試料10〜20mgを加える。この系を超音波分散機にて1分間分散処理することにより調製する。
この外添剤の添加量としては、トナー中に0.1〜5.0質量%、好ましくは0.5〜4.0質量%である。また、外添剤としては種々のものを組み合わせて使用してもよい。
n−ドデシル硫酸ナトリウム0.90kgと純水10.0Lを入れ攪拌溶解する。この溶液に、リーガル330R(キャボット社製カーボンブラック)1.20kgを徐々に加え、1時間よく攪拌した後に、サンドグラインダー(媒体型分散機)を用いて、20時間連続分散した。このものを「着色剤分散液1」とする。また、ドデシルベンゼンスルホン酸ナトリウム0.055kgとイオン交換水4.0Lからなる溶液を「アニオン界面活性剤溶液A」とする。
トナー製造例1において、着色剤をカーボンブラックの代わりにベンジジン系イエロー顔料を1.05kg使用した他は同様にして、表3に示すトナー51〜59を得た。
トナー製造例1において、着色剤をカーボンブラックの代わりにキナクリドン系マゼンタ顔料を1.20kg使用した他は同様にして、表3〜4に示すトナー60〜68を得た。
トナー製造例1において、着色剤をカーボンブラックの代わりにフタロシアニン系シアン顔料を0.60kg使用した他は同様にして、表4に示すトナー69〜77を得た。
スチレン165g、n−ブチルアクリレート35g、カーボンブラック10g、ジ−t−ブチルサリチル酸金属化合物2g、スチレン−メタクリル酸共重合体8g、パラフィンワックス(mp=70℃)20gを60℃に加温し、TKホモミキサー(特殊機化工業社製)にて12000rpmで均一に溶解、分散した、これに重合開始剤として2,2′−アゾビス(2,4−バレロニトリル)を10gを加えて溶解させ、重合性単量体組成物を調製した。ついで、イオン交換水710gに0.1M燐酸ナトリウム水溶液450gを加え、TKホモミキサーにて13000rpmで攪拌しながら1.0M塩化カルシウム68gを徐々に加え、燐酸三カルシウムを分散させた懸濁液を調製した。この懸濁液に上記重合性単量体組成物を添加し、TKホモミキサーにて10000rpmで20分間攪拌し、重合性単量体組成物を造粒した。その後、攪拌翼の構成を図2とした反応装置を使用し、75〜95℃にて5〜15時間反応させた。塩酸により燐酸三カルシウムを溶解除去し、次に遠心分離機を用いて、遠心沈降法により液中にて分級を行い、ついで濾過、洗浄、乾燥させた。得られた着色粒子の100質量部に、シリカ微粒子1質量部をヘンシェルミキサーにて外添混合して懸濁重合法によるトナーを得た。
トナー製造例5において、攪拌翼の構成を図9としたこと、および遠心分離機を用いた液中での分級を行わなかった他は同様にして、表5に示すトナー84を得た。
スチレン−nブチルアクリレート共重合体樹脂100kgとカーボンブラック10kgとポリプロピレン4質量部とからなるトナー原材料をヘンシェルミキサーにより予備混合し、二軸押出機にて溶融混練し、ハンマーミルにて粗粉砕し、ジェット式粉砕機にて粉砕し、得られた粉体をスプレードライヤーの熱気流中に分散して(200〜300℃に0.05秒間)形状を調整した粒子を得た。この粒子を風力分級機にて目的の粒径分布となるまで繰り返し分級した。得られた着色粒子の100質量部に、シリカ微粒子1質量部をヘンシェルミキサーにて外添混合して粉砕法による表5に示すトナー85〜88を得た。
コニカ製デジタル複写機Konica7033を改造し、図11に示した現像装置を用いて画像形成した。
ランクB:スジ状の薄いムラが存在
ランクC:スジ状の薄いムラが数本存在
ランクD:スジ状のはっきりしたムラが数本以上存在
定着器としては圧接方式の加熱定着器を採用した。構成は下記である。
2 撹拌槽
3 回転軸
4 下段の撹拌翼
5 上段の撹拌翼
6 中孔部
11 静電潜像担持体(電子写真感光体ドラム)
12 トナー搬送部材(ゴムローラー)
13 トナー層厚規制部材(スチール製弾性ブレード)
15 トナー補給補助部材(撹拌羽根付きローラー)
16 非磁性一成分トナー
17 トナータンク
Claims (7)
- トナー搬送部材、トナー層規制部材及びトナー補給補助部材を備え、且つトナー補給補助部材とトナー搬送部材、及びトナー層規制部材とトナー搬送部材がそれぞれ当接している現像装置を用いて薄層化させた非磁性トナーを静電潜像形成体表面に供給して潜像を現像する非磁性一成分静電潜像現像方法において、少なくとも樹脂粒子を水系媒体中で会合させてなる、形状係数1.2〜1.6の範囲にあるトナー粒子が65個数%以上であり、形状係数の変動係数が16%以下で、かつ、該トナー粒子の粒径をD(μm)とするとき、自然対数lnDを横軸にとり、この横軸を0.23間隔で複数の階級に分けた個数基準の粒度分布を示すヒストグラムにおける、最頻階級に含まれるトナー粒子の相対度数(m1)と、前記最頻階級の次に頻度の高い階級に含まれるトナー粒子の相対度数(m2)との和(M)が70%以上であるトナーを用いることを特徴とする非磁性一成分静電潜像現像方法。
- 請求項1に記載の非磁性一成分静電潜像現像方法を用い、潜像形成、現像、転写、定着の工程を経ることを特徴とする画像形成方法。
- 使用されるトナーが、下記定義による角がないトナー粒子を50個数%以上含有することを特徴とする請求項2に記載の画像形成方法。
(角がないトナー)
トナー粒子の長径をL、L/10を半径Rとする円で、トナー粒子周囲線に対し1点で内側に接しつつ内側をころがした場合に、全く円がトナーの外側に実質的にはみださない場合を角がないトナー粒子という。実質的にはみ出さない場合とは、はみ出す円が存在する突起が1箇所以下をいう。また、トナー粒子の長径とは、トナー粒子の平面上への投影像を2本の平行線ではさんだとき、その平行線の間隔が最大となる粒子の幅をいう。 - 使用されるトナーの個数平均粒径が3〜8μmであることを特徴とする請求項2又は3に記載の画像形成方法。
- 使用されるトナーが、少なくとも重合性単量体を水系媒体中で重合せしめて得られた樹脂粒子を、水系媒体中で会合させて造られることを特徴とする請求項2〜4の何れか1項に記載の画像形成方法。
- 請求項1に記載の非磁性一成分静電潜像現像方法を用い、潜像形成、現像、転写、定着の工程を有することを特徴とする画像形成装置。
- トナー搬送部材、トナー層規制部材及びトナー補給補助部材を備え、且つトナー補給補助部材とトナー搬送部材、及びトナー層規制部材とトナー搬送部材がそれぞれ当接している現像装置を用いて薄層化させた非磁性トナーを静電潜像形成体表面に供給して潜像を現像する非磁性一成分静電潜像現像方法に用いられるトナーにおいて、少なくとも樹脂粒子を水系媒体中で会合させてなる、形状係数1.2〜1.6の範囲にあるトナー粒子が65個数%以上であり、形状係数の変動係数が16%以下で、かつ、該トナー粒子の粒径をD(μm)とするとき、自然対数lnDを横軸にとり、この横軸を0.23間隔で複数の階級に分けた個数基準の粒度分布を示すヒストグラムにおける、最頻階級に含まれるトナー粒子の相対度数(m1)と、前記最頻階級の次に頻度の高い階級に含まれるトナー粒子の相対度数(m2)との和(M)が70%以上であるトナーを用いることを特徴とするトナー。
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