JP4729869B2 - インクジェットプリンター用水性記録液の製造方法 - Google Patents
インクジェットプリンター用水性記録液の製造方法 Download PDFInfo
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- JP4729869B2 JP4729869B2 JP2004161277A JP2004161277A JP4729869B2 JP 4729869 B2 JP4729869 B2 JP 4729869B2 JP 2004161277 A JP2004161277 A JP 2004161277A JP 2004161277 A JP2004161277 A JP 2004161277A JP 4729869 B2 JP4729869 B2 JP 4729869B2
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- Prior art keywords
- pigment
- dispersion
- organic polymer
- polymer compound
- aqueous
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- 125000000129 anionic group Chemical group 0.000 claims description 58
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- 238000000034 method Methods 0.000 claims description 30
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- 238000011049 filling Methods 0.000 description 4
- 235000011187 glycerol Nutrition 0.000 description 4
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 4
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- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
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- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
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- 239000012190 activator Substances 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 125000005442 diisocyanate group Chemical group 0.000 description 3
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- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 2
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- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
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Description
しかしながら、インクジェットプリンター用水性記録液には、一般に、インクとしての印字特性を付加するため、エチレングリコール、グリセリン、pH調整剤、活性剤等を加えるため、上記特許文献1の様な方法で得られた水性顔料分散体をもってしても、例えば、パールミル(PM−DCP型)等の流通式湿式ビーズミルで製造したインクジェットプリンター用水性記録液は、顔料の一次粒子の破砕が避けられず、貯蔵中に粘度上昇や粒子径の増大等を起こし、水性記録液の貯蔵安定性を実用的なレベルまでもっていけないという欠点があった。
しかしながら、このインクジェットプリンター用水性記録液は、従来の分散装置を用いて得た顔料分散液で調製するより、貯蔵安定性に優れた極めて実用性の高い前記水性記録液が得られるものの、近年の市場要求レベルから見て、その貯蔵安定性は未だ不十分であった。
しかしながら、遠心分離機は、顔料の粗粒を除去し、インクジェットプリンター印字での吐出安定性の向上(プリンターのノズル詰まりを軽減)には有効であるが、過大な遠心力は、粗粒と共に有用な粒度成分も除去することになり、残った粒度成分には分散工程での破砕された顔料粒子が多く残されるため、インクジェットプリンターインクとしたときにかえって貯蔵安定性が不良となる欠点があった。
[スチレン/アクリル系共重合体の合成]
滴下装置、温度計、窒素ガス導入管、攪拌装置および還流冷却管を備えた容量3リットルの四つ口フラスコに、メチルエチルケトン1,000部を仕込み、窒素シール下に、攪拌しながら液温を78℃まで昇温させた後、スチレン200部、メタクリル酸n−ブチル400部、アクリル酸n−ブチル50部、メタクリル酸2−ヒドロキシエチル150部、メタクリル酸200部、パーブチルO(日本油脂(株)製のtert−ブチルパーオキシオクトエート)80部とからなる混合液を4時間掛けて滴下した。更に、同温度で8時間反応を続けた。
反応混合物を室温まで放冷した後、不揮発分が50%となるようにメチルエチルケトンを加えて希釈して、酸価130、水酸基価65、数平均分子量13,000の有機高分子化合物溶液(A)を得た。
[加熱架橋型共重合体の合成]
滴下装置、温度計、窒素ガス導入管、攪拌装置および還流冷却管を備えた容量3リットルの四つ口フラスコに、メチルエチルケトン1,000部を仕込み、窒素シール下に、攪拌しながら液温を78℃まで昇温させた後、n−ブチルメタクリレート335部、n−ブチルアクリレート358部、2−ヒドロキシエチルメタクリレート150部、メタクリル酸107部、グリシジルメタクリレート50部、パーブチルO(日本油脂(株)製のtert−ブチルパーオキシオクトエート)80部とからなる混合液を4時間掛けて滴下した。更に、同温度で8時間反応を続けた。反応混合物を室温まで放冷した後、不揮発分が50%となるようにメチルエチルケトンを加えて希釈して、酸価70、水酸基価65、数平均分子量10,000の有機高分子化合物溶液(B)を得た。
20%水酸化ナトリウム19部及びイオン交換水221部を加え、均一になったところへ、合成例1で得られた有機高分子化合物溶液(A)の80部を加え、攪拌して、有機高分子化合物中のカルボキシル基を100%中和すると共に、有機高分子化合物を水中に溶解させた。次いで、FASTOGEN BLUE TGR(大日本インキ化学工業株式会社製の銅フタロシアニンブルー顔料 C.I.Pigment Blue 15:3)80部を攪拌しながらゆっくりと加え、更に30分間よく攪拌して銅フタロシアニンブルー顔料の懸濁液を得た。
塩基で中和されたカルボキシル基を有する有機高分子化合物と顔料からなる水性分散体(顔料分散液)に水を加えて倍に希釈した後、常圧蒸留によってメチルエチルケトンを蒸留した。
溶剤蒸留後の水性分散体をディスパーで攪拌しながら、1規定塩酸を加えて水性分散体のpHを3〜5に調整し、有機高分子化合物を析出させ、カルボキシル基を有する有機高分子化合物で顔料を被覆した。
カルボキシル基を有する有機高分子化合物で被覆された顔料スラリーを吸引濾過、水洗して、含水ケーキを得た。
ディスパーで攪拌下、含水ケーキに、水酸化ナトリウムの10%水溶液を加え分散体のpHを8.5〜9.5に調整した。更に、1時間攪拌を続けた後、水を加えて、不揮発分が23%になるように調整した。
連続式遠心分離機((株)コクサン製200B特型)の遠心力を5,500Gで運転し、かつ、供給液からの顔料の粗粒除去率を13%となるように、上記(5)再分散工程で得られた顔料分散液を連続的に供給した後、水を加えて、不揮発分が20%となるように調整して、塩基で中和されたカルボキシル基を有する有機高分子化合物で顔料が被覆されてなるシアン水性顔料分散体(A−1)を得た。
上記シアン水性顔料分散体(A−1)20.0部、イオン交換水44.4部、エチレングリコール4.0部、グリセリン8.0部、ジエタノールアミン2.4部、エマルゲン147(花王株式会社製のノニオン活性剤)1.2部を混合し、塩基で中和されたカルボキシル基を有する有機高分子化合物で顔料が被覆されてなるインクジェットプリンター用水性記録液を調製した。調製した水性記録液をインクジェットプリンターBJC−400J(キャノン株式会社製)のカートリッジに詰め、カラーBJペーパー(キャノン株式会社製)に印刷した結果、プリンターのノズル詰まりはなく、吐出安定性良好で、十分に発色の良いシアン色の画像を得た。
実施例1で、連続式遠心分離機の遠心力を5,500Gから9,000Gに代えた以外は実施例1と同様の操作を行い、不揮発分20%のシアン水性顔料分散体(A−3)を得た。
実施例2の遠心分離工程で、供給液からの顔料の粗粒除去率を5%から1%に代えた以外は実施例2と同様の操作を行い、不揮発分20%のカーボンブラック水性顔料分散体(A−4)を得た。
実施例3の遠心分離工程で、連続式遠心分離機の遠心力を5,500Gから3,000Gに代えた以外は実施例1と同様の操作を行い、不揮発分20%のシアン水性顔料分散体(B−2)を得た。
プリンターのノズル詰まり:○は詰まり無しで吐出安定性良好。×は詰まり有りで吐出安定性不良。
2 円筒状ロータ
3 ロータの回転軸
4 供給口
5 スリット
6 液室
7 分散メディア
8 セパレータ
9 吐出口
Claims (3)
- 中和されたアニオン性基を有する有機高分子化合物で顔料が被覆されてなるインクジェットプリンター用水性記録液を製造する工程として、アニオン性基を塩基性化合物で中和して水溶性化したアニオン性基を有する有機高分子化合物と水性媒体と顔料とを混合し懸濁液として、懸濁液の液媒体中に顔料を均一に微分散させるに当たり、分散装置として、懸濁液の供給口と吐出口を有する、セパレータを有する内壁が円筒状の外部固定容器(I)と、その内部に所定間隙を介し設けられた、回転軸中心に回転可能な円筒状ロータ(II)とからなり、当該ロータ(II)が、円筒内部に中空の液室を有し、液室に向かって懸濁液が供給できる、当該供給口に対向するスリットと、液室外部に通じる円筒側壁に複数の液吐出孔とを有するロータ(II)であり、当該外部固定容器(I)が、当該ロータの円周外壁面と所定間隙を介して対向する、分散メディアよりも小さい所定径の複数の穴を有するセパレータが円筒状内壁に設けられた外部固定容器(I)であり、当該ロータとセパレータとの間隙には分散メディアが充填された分散装置を用い、ロータ(II)を回転させながら、容器(I)の供給口からロータのスリットに向けて、液室に懸濁液を供給し、遠心力にて吐出孔から懸濁液を放出し、分散メディアを介してセパレータを通過した懸濁液を容器(I)の吐出口から取り出し、顔料を微分散して顔料分散液とした後、酸性化合物を加えてアニオン性基を有する有機高分子化合物を析出させることにより顔料をアニオン性基を有する有機高分子化合物で被覆し、次いで塩基性化合物を加えてアニオン性基を有する有機高分子化合物のアニオン性基を中和して水性媒体中に分散させた後、遠心分離機の特定遠心力下で、顔料の粗粒を特定量除去して水性分散体とし、これを用いて、水性記録液を製造するインクジェットプリンター用水性記録液の製造方法において、
水性分散体中の顔料の粗粒を除去するための遠心分離機の遠心力が5,500〜6,000Gであり、かつ、顔料の粗粒を除去する割合が質量換算5〜13%であることを特徴とするインクジェットプリンター用水性記録液の製造方法。 - アニオン性基を有する有機高分子化合物が、酸価30〜150KOHmg/gのカルボキシル基を有する有機高分子化合物である請求項1記載のインクジェットプリンター用水性記録液の製造方法。
- アニオン性基を有する有機高分子化合物が、酸価30〜150KOHmg/g、かつ、水酸基価20〜120KOHmg/gのカルボキシル基と水酸基を有する有機高分子化合物である請求項1または2記載のインクジェットプリンター用水性記録液の製造方法。
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JPH11166145A (ja) * | 1997-12-05 | 1999-06-22 | Dainippon Ink & Chem Inc | インクジェットプリンター用水性記録液の製造方法 |
JP2000160093A (ja) * | 1998-12-01 | 2000-06-13 | Dainippon Ink & Chem Inc | 水性顔料分散体、その製造方法ならびに水性記録液 |
JP2002501965A (ja) * | 1998-01-29 | 2002-01-22 | キャボット コーポレイション | 分散体の純化方法及びインクジェットインクの製造方法 |
JP2004083786A (ja) * | 2002-08-28 | 2004-03-18 | Dainippon Ink & Chem Inc | 水性顔料分散体の製造方法 |
JP2004203970A (ja) * | 2002-12-24 | 2004-07-22 | Kao Corp | インクジェット記録用インク |
JP2004285172A (ja) * | 2003-03-20 | 2004-10-14 | Dainippon Ink & Chem Inc | 水性顔料分散体の製造方法及び水性顔料記録液の製造方法 |
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JPH11166145A (ja) * | 1997-12-05 | 1999-06-22 | Dainippon Ink & Chem Inc | インクジェットプリンター用水性記録液の製造方法 |
JP2002501965A (ja) * | 1998-01-29 | 2002-01-22 | キャボット コーポレイション | 分散体の純化方法及びインクジェットインクの製造方法 |
JP2000160093A (ja) * | 1998-12-01 | 2000-06-13 | Dainippon Ink & Chem Inc | 水性顔料分散体、その製造方法ならびに水性記録液 |
JP2004083786A (ja) * | 2002-08-28 | 2004-03-18 | Dainippon Ink & Chem Inc | 水性顔料分散体の製造方法 |
JP2004203970A (ja) * | 2002-12-24 | 2004-07-22 | Kao Corp | インクジェット記録用インク |
JP2004285172A (ja) * | 2003-03-20 | 2004-10-14 | Dainippon Ink & Chem Inc | 水性顔料分散体の製造方法及び水性顔料記録液の製造方法 |
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