JP2005258221A - トナー用結着樹脂 - Google Patents
トナー用結着樹脂 Download PDFInfo
- Publication number
- JP2005258221A JP2005258221A JP2004071543A JP2004071543A JP2005258221A JP 2005258221 A JP2005258221 A JP 2005258221A JP 2004071543 A JP2004071543 A JP 2004071543A JP 2004071543 A JP2004071543 A JP 2004071543A JP 2005258221 A JP2005258221 A JP 2005258221A
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- Prior art keywords
- resin
- toner
- binder resin
- raw material
- temperature
- Prior art date
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Abstract
【解決手段】連続相を形成する縮重合系樹脂(樹脂a)と分散相を形成する付加重合系樹脂(樹脂b)とからなるトナー用結着樹脂であって、樹脂断面における直径2μm以下の分散相が、分散相の断面積全体の90%以上であり、樹脂bのガラス転移温度が10℃以下であるトナー用結着樹脂、並びに該トナー用結着樹脂及び着色剤を含有してなる電子写真用トナー。
【選択図】なし
Description
で表されるビスフェノールAのアルキレンオキサイド付加物等の芳香族ジオール;エチレングリコール、1,2 −プロピレングリコール、1,4 −ブタンジオール、ネオペンチルグリコール、ポリエチレングリコール、ポリプロピレングリコール等の脂肪族ジオール;水素添加ビスフェノールA等が挙げられる。
高化式フローテスター((株)島津製作所製、CFT−500)を用い、1gの試料を昇温速度6℃/分で加熱しながら、プランジャーにより1.96MPaの荷重を与え、直径1mm、長さ1mmのノズルを押し出すようにし、これによりフローテスターのプランジャー降下量(流れ値)―温度曲線を描き、そのS字曲線の高さをhとするときh/2に対応する温度(樹脂の半分が流出した温度)を軟化点とする。
示差走査熱量計(セイコー電子工業社製、DSC210)を用いて200℃まで昇温し、その温度から降温速度10℃/分で0℃まで冷却したサンプルを昇温速度10℃/分で測定し、融解熱の最大ピーク温度以下のベースラインの延長線と、ピークの立ち上がり部分からピークの頂点まで最大傾斜を示す接線との交点の温度をガラス転移温度とする。ガラス転移温度のピークが2つ以上ある場合は、付加重合系樹脂についてその原料モノマーの組成からFox法により算出されるガラス転移温度をピークの帰属判断の補助として使用することができる。
表1、2に示す縮重合系樹脂の原料モノマー及び触媒を窒素導入管、脱水管、攪拌器及び熱伝対を装備した5リットル容の四つ口フラスコにを入れ、窒素雰囲気下で160℃で攪拌しつつ、表1、2に示す付加重合系樹脂の原料モノマー及び重合開始剤の混合物を滴下ロートより1時間かけて滴下した。160℃で2時間保持した後、230℃に昇温して所望の軟化点に達するまで縮重合反応させ、樹脂A〜Rを得た。
(1) スチレン140g、ブタジエン60g、ベンゾイルパーオキサイド15g及びトルエン500gを85℃で10時間反応させた後、マレイン酸20gを添加した。さらに付加重合させた後、水を少量添加して開環させて、樹脂S1の溶液を得た。樹脂S1の軟化点は95℃、ガラス転移温度は32.1℃であった。
表3に示す結着樹脂100重量部、磁性粉「MTS106HD」(戸田工業社製)66重量部、荷電制御剤「T−77」(保土谷化学工業社製)0.5重量部、ポリエチレンワックス「C−80」(サゾール社製、融点:82℃)1重量部及びポリプロピレンワックス「NP−105」(三井化学社製、融点:140℃)1重量部をヘンシェルミキサーで十分混合した後、混練部分の全長1560mm、スクリュー径42mm、バレル内径43mmの同方向回転二軸押出機を用いて溶融混練した。ロール内の加熱温度は140℃、ロール回転速度は150回転/分、混合物の供給速度は20kg/時、平均滞留時間は約18秒であった。
得られた混練物を冷却ロールで圧延し、機械式粉砕し、分級して、重量平均粒径(D4 )が6μmの粉体を得た。
磁性一成分現像装置「Laser Jet 4200」(HP社製)に磁性トナー250gを実装し、トナー付着量が0.6mg/cm2 の未定着画像(2cm×12cm)を得た。
得られた未定着画像を、複写機「AR−505」(シャープ(株)製)の定着機をオフラインによる定着可能なように改良した定着機(定着速度:200mm/sec)を用いて、100℃から240℃へと10℃づつ順次上昇させながら定着試験を行った。定着紙には、「CopyBond SF−70NA」(シャープ社製、75g/m2 )を使用した。
◎◎: 最低定着温度が170℃未満である。
◎ : 最低定着温度が170℃以上、190℃未満である。
○ : 最低定着温度が190℃以上、210℃未満である。
× : 最低定着温度が210℃以上、240℃未満である。
××: 最低定着温度が240℃以上である。
トナー4gを温度50℃、湿度60%の環境下で1週間放置した後、パウダーテスターを用いて凝集度を測定し、以下の評価基準に従って、耐ブロッキング性を評価した。結果を表3に示す。
◎ : 凝集が全く認められない。
○ : 凝集がほとんど認められない。
× : 凝集が認められる。
Claims (6)
- 連続相を形成する縮重合系樹脂(樹脂a)と分散相を形成する付加重合系樹脂(樹脂b)とからなるトナー用結着樹脂であって、樹脂断面における直径2μm以下の分散相が、分散相の断面積全体の90%以上であり、樹脂bのガラス転移温度が10℃以下であるトナー用結着樹脂。
- 樹脂aがポリエステル、ポリエステル−ポリアミド及びポリアミドからなる群より選ばれた少なくとも1種であり、樹脂bがビニル系樹脂である請求項1記載のトナー用結着樹脂。
- 樹脂aの樹脂bに対する重量比が50/50〜95/5である請求項1又は2記載のトナー用結着樹脂。
- 樹脂aの原料モノマー及び樹脂bの原料モノマーを、樹脂aの原料モノマーの樹脂bの原料モノマーに対する重量比が55/45〜95/5の範囲で用い、縮重合反応と付加重合反応とを行って得られる、請求項1〜3いずれか記載のトナー用結着樹脂。
- さらに、樹脂aの原料モノマーと樹脂bの原料モノマーの両方と反応するモノマーを構成単位として有してなる請求項1〜4いずれか記載のトナー用結着樹脂。
- 請求項1〜5いずれか記載のトナー用結着樹脂及び着色剤を含有してなる電子写真用トナー。
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JPH0777837A (ja) * | 1993-07-13 | 1995-03-20 | Ricoh Co Ltd | 静電荷像現像用トナー |
JPH0798518A (ja) * | 1993-04-27 | 1995-04-11 | Kao Corp | 電子写真用トナー |
JPH07230187A (ja) * | 1993-12-24 | 1995-08-29 | Sekisui Chem Co Ltd | トナー用樹脂組成物及びトナー |
JPH0830020A (ja) * | 1994-07-11 | 1996-02-02 | Sekisui Chem Co Ltd | トナー用樹脂組成物及びトナー |
JPH0844108A (ja) * | 1994-07-26 | 1996-02-16 | Kao Corp | 結着樹脂及び静電像現像用トナー |
JP3222976B2 (ja) * | 1993-03-25 | 2001-10-29 | 株式会社東芝 | 電子写真用現像剤 |
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JP3222976B2 (ja) * | 1993-03-25 | 2001-10-29 | 株式会社東芝 | 電子写真用現像剤 |
JPH0798518A (ja) * | 1993-04-27 | 1995-04-11 | Kao Corp | 電子写真用トナー |
JPH0777837A (ja) * | 1993-07-13 | 1995-03-20 | Ricoh Co Ltd | 静電荷像現像用トナー |
JPH07230187A (ja) * | 1993-12-24 | 1995-08-29 | Sekisui Chem Co Ltd | トナー用樹脂組成物及びトナー |
JPH0830020A (ja) * | 1994-07-11 | 1996-02-02 | Sekisui Chem Co Ltd | トナー用樹脂組成物及びトナー |
JPH0844108A (ja) * | 1994-07-26 | 1996-02-16 | Kao Corp | 結着樹脂及び静電像現像用トナー |
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JP2019109274A (ja) * | 2017-12-15 | 2019-07-04 | 花王株式会社 | トナー用結着樹脂組成物 |
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