JP5843395B2 - 顔料分散剤の製造方法 - Google Patents
顔料分散剤の製造方法 Download PDFInfo
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- JP5843395B2 JP5843395B2 JP2012095290A JP2012095290A JP5843395B2 JP 5843395 B2 JP5843395 B2 JP 5843395B2 JP 2012095290 A JP2012095290 A JP 2012095290A JP 2012095290 A JP2012095290 A JP 2012095290A JP 5843395 B2 JP5843395 B2 JP 5843395B2
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Description
(A)下記の一般式(1)〜(7)及び(9)のいずれかで表される芳香族エポキシ化合物
(B)炭素数12以上の脂肪酸化合物、又は炭素数12以上のモノヒドロキシ脂肪酸を縮合させてなるポリエステル化合物
本発明の顔料分散剤は、(A)分子内に1以上のエポキシ基を有する芳香族エポキシ化合物と、(B)炭素数12以上の脂肪酸化合物、又は炭素数12以上のモノヒドロキシ脂肪酸を縮合させてなるポリエステル化合物と、を反応させてなる。この反応では、芳香族エポキシ化合物に含まれるエポキシ基と、脂肪酸化合物又はポリエステル化合物に含まれるカルボキシル基とが反応し、芳香族エポキシ化合物に脂肪鎖の導入された化合物が得られる。本発明者らは、顔料分散剤の検討を重ねる過程でこの種の化合物が高い顔料分散作用を示すことを見出し、本発明を完成するに至った。以下、上記(A)成分及び(B)成分について説明する。なお、本明細書では、上記(A)で表される化合物及び上記(B)で表される化合物をそれぞれ(A)成分及び(B)成分とも呼ぶ。
上記顔料分散剤を含む印刷インキ組成物もまた本発明の一つである。このような印刷インキ組成物は、顔料が微分散安定化されていることに伴い、高い光沢と着色力、高い透明性、高い流動性等を備える。
上記顔料分散剤の製造方法もまた本発明の一つである。本発明の顔料分散剤の製造方法は、(A)分子内に1以上のエポキシ基を有する芳香族エポキシ化合物、及び(B)炭素数12以上の脂肪酸化合物、又は炭素数12以上のモノヒドロキシ脂肪酸を縮合させてなるポリエステル化合物を溶媒中で反応させる反応工程を含む。このような製造方法については、既に説明した通りであるので、ここでの説明を省略する。
・顔料分散剤A〜J及びM
反応容器に、エポキシ樹脂、ポリ(12−ヒドロキシステアリン酸)(PHSA;伊藤製油株式会社製、製品名PHF−33)、溶媒であるDMFを表1に記載の割合で仕込み、窒素気流下にて、125℃で3時間にわたり撹拌した。反応溶液を100℃まで放冷し、テレフタル酸(TPA)を表1の割合で反応溶液に加え、150℃で2.5時間にわたり撹拌した。その後、溶媒であるDMFを減圧留去し、粘ちょうな液体である顔料分散剤A〜J及びMを得た。これらの顔料分散剤は、架橋タイプである。なお、表1に記載した数値は、質量部である。
反応容器に、エポキシ樹脂、PHSA、溶媒であるDMFを表1に記載の割合で仕込み、窒素気流下にて、125℃で5.5時間にわたり撹拌した。その後、溶媒であるDMFを減圧留去し、粘ちょうな液体である顔料分散剤K及びLを得た。これらの顔料分散剤は、非架橋タイプである。
上記jER−1032H60自体を顔料分散剤Nとし、上記jER−1031S自体を顔料分散剤Oとし、上記PHSA自体を顔料分散剤Pとした。顔料分散剤N〜Pは、本発明の顔料分散剤を合成するための原料であり、本発明の顔料分散剤ではない。
コンデンサー、温度計及び撹拌機を装着した4つ口フラスコに、重量平均分子量10万のロジン変性フェノール樹脂(荒川化学工業株式会社製、KG−2212)、大豆油及び石油系溶剤(JX日鉱日石エネルギー株式会社製、AFソルベント7号)を下記配合比率となるように仕込んだ後200℃に昇温し、同温度を1時間維持することにより樹脂を溶解させた後、アルミニウムエチルアセトアセテート・ジイソプロピレート(川研ファインケミカル株式会社製、ALCH)を0.5部仕込み、その後170℃で60分間加熱保持して、印刷インキ組成物用ワニス(以下、単に「ワニス」とも呼ぶ。)を得た。
ロジン変性フェノール樹脂:35部、大豆油:20部、石油系溶剤:44.5部
シアニンブルー顔料16部、炭酸カルシウム(白石カルシウム株式会社製、白艶華CC)10部、上記ワニス64部、大豆油10部、及び上記顔料分散剤A〜Pのいずれかを表2の質量部にて混合し、得られた混合物を三本ロールミルにより、印刷インキ組成物として十分に鮮明な色相及び光沢が発現するまで練肉し、シアンベースを得た。得られたシアンベースに大豆油を添加することで粘度を調節し、ラレー粘度6.0Pa・s(25℃)の実施例1〜14及び比較例1〜4の印刷インキ組成物を得た。実施例及び比較例の番号と、使用した顔料分散剤の種類との対応は、表2に示した通りである。
実施例1〜14及び比較例1〜4の印刷インキ組成物のそれぞれについて、垂直ガラス板流度計を用いて、25℃において、印刷インキ組成物0.5ccが重力により10分間で流れた距離を測定した。この距離が大きいほど、流動性が良好であり、顔料の分散性が優れることになる。この評価において、印刷インキ組成物の流れた距離が100mm以上のものを◎とし、50mm以上100mm未満のものを○とし、50mm未満のものを×として表3に結果を示す。
実施例1〜14及び比較例1〜4の印刷インキ組成物のそれぞれについて、25℃の恒温槽に3ヶ月間保管した後、ラレー粘度計による粘度の測定(25℃)を行った。この評価において、粘度が6.5Pa・s以下であったものを◎とし、6.5Pa・sを超え7.0Pa・s以下であったものを○とし、7.0Pa・sを超えたものを×として表3に結果を示す。
Claims (1)
- 下記(A)及び(B)を溶媒中で反応させる反応工程を含むことを特徴とする顔料分散剤の製造方法。
(A)下記の一般式(1)〜(7)及び(9)のいずれかで表される芳香族エポキシ化合物
(B)炭素数12以上の脂肪酸化合物、又は炭素数12以上のモノヒドロキシ脂肪酸を縮合させてなるポリエステル化合物
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