JP5539691B2 - アニオン性基が付与されたカーボンブラックを含む非水系インク組成物 - Google Patents
アニオン性基が付与されたカーボンブラックを含む非水系インク組成物 Download PDFInfo
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- JP5539691B2 JP5539691B2 JP2009220712A JP2009220712A JP5539691B2 JP 5539691 B2 JP5539691 B2 JP 5539691B2 JP 2009220712 A JP2009220712 A JP 2009220712A JP 2009220712 A JP2009220712 A JP 2009220712A JP 5539691 B2 JP5539691 B2 JP 5539691B2
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- carbon black
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- aqueous ink
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- MXVMODFDROLTFD-UHFFFAOYSA-N 2-[2-[2-(2-butoxyethoxy)ethoxy]ethoxy]ethanol Chemical compound CCCCOCCOCCOCCOCCO MXVMODFDROLTFD-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Ink Jet (AREA)
- Ink Jet Recording Methods And Recording Media Thereof (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Description
攪拌装置、温度計、窒素ガス導入装置、及び冷却管を取り付けたフラスコ中に、表1に示す処方に従い、各物質を秤り入れた。
*2.上記式(1)で示されるアゾビスシアノ吉草酸、和光純薬(株)製
*3.上記式(2)で示される過硫酸カリウム、和光純薬(株)製
*4.β‐ナフタレンスルホン酸ホルマリン縮合物ナトリウム塩、花王(株)製
三角フラスコに乾燥カーボンブラック1gを1mg単位で秤量し、0.1規定の炭酸水素ナトリウム水溶液50mlを加えた。フラスコを4時間振盪した後、濾過し、得られた濾液の上澄み液20mlを採取して0.01規定の塩酸水溶液によって滴定試験を行い、表面上のアニオン性基量を求めた。この値を、該当する未酸化カーボンブラックの窒素吸着比表面積で除した値を単位面積あたりのアニオン性基量(μeq/m2)とした。
アニオン性基量(μeq/m2)=[{(50/20)×0.01×(滴定量−空滴定量)}/(カーボンブラックの重量×比表面積)]×103
処理例1〜3で得られたカーボンブラックを夫々用いて、下記表2に示す処方で、実施例1〜3のインクジェット用インクを調製した。比較例1のインクには、未処理のカーボンブラック(MA600、三菱化学(株)製)を用いた。
*2.オレイン酸メチル:ナフテン系溶剤(AF−7、新日本石油社製):イソミリスチルアルコール(FOC−140N、日産化学工業(株)製)=1:1:1の混合物
23℃、湿度50%の環境下において、ノズル口径が25μmで記録解像度が300dpiであるピエゾ型インクジェット記録ヘッドを使用して、1ドットあたりの吐出量30plで、ベタ画像とドット画像を、インクジェット用塗工紙(理想用紙IJマット及びIJ環境用紙マット93、いずれも理想科学工業(株)製)上に、夫々、印刷した。得られた画像の画像濃度を下記方法により調べた。
ベタ画像の画像濃度を、マクベス反射濃度計(RD920、グレタグマクベス社製)を用いて測定し、OD値が1.05以上をA、1.00以上1.05未満をB、1.00未満をCとして評価した。結果を表3に示す。
インク30plを塗工紙(理想用紙IJマット)上の同じ箇所に4回、計120plを連続して吐出した直後に、インクの浮きが認められない場合にはA、10秒経過後に浮きが無くなった場合にはB、10秒経過後でも浮きが認められた場合にはCとして評価した。結果を表3に示す。
Claims (4)
- 顔料と、有機溶剤と、分散剤(ただし、(A)酸性官能基、酸性官能基の中和塩基、塩基性官能基、塩基性官能基の中和塩基及びノニオン系極性分子鎖から選ばれる1種以上の極性基又は極性分子鎖と、(B)低極性分子鎖と、(C)活性エネルギー線硬化性不飽和基とを含む樹脂からなる分散剤を除く。)を含むインクジェット記録用の非水系インク組成物において、前記顔料がアニオン性基を1.5μeq/m2〜10μeq/m2有するカーボンブラックであることを特徴とする、インクジェット記録用非水系インク組成物。
- 前記カーボンブラックが、アニオン性基を2.0μeq/m2〜6.0μeq/m2有する、請求項1記載の非水系インク組成物。
- 前記アニオン性基が、−COOH及び−SO3 Hから選ばれる少なくとも一種である、請求項1または2記載の非水系インク組成物。
- 前記カーボンブラックを、非水系インク組成物重量の5〜15重量%で含む、請求項1〜3のいずれか1項記載の非水系インク組成物。
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