JP3931649B2 - Pigment composition and pigment dispersion using the same - Google Patents

Pigment composition and pigment dispersion using the same Download PDF

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JP3931649B2
JP3931649B2 JP2001386609A JP2001386609A JP3931649B2 JP 3931649 B2 JP3931649 B2 JP 3931649B2 JP 2001386609 A JP2001386609 A JP 2001386609A JP 2001386609 A JP2001386609 A JP 2001386609A JP 3931649 B2 JP3931649 B2 JP 3931649B2
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pigment
general formula
weight
resin
organic
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JP2003183562A (en
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篤 遠藤
勝彦 澤村
大介 田邉
哲哉 佐井
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Toyo Ink SC Holdings Co Ltd
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Toyo Ink SC Holdings Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、印刷インキまたは塗料に使用した場合の流動性、分散安定性ならびに乾燥皮膜にした場合の光沢等に優れる顔料組成物およびそれを用いた顔料分散体に関するものである。
【0002】
【従来の技術】
印刷インキ、塗料等においては、顔料を微細な状態で分散させることにより、印刷物または塗加工物に鮮明な色調、光沢等の適性を持たせている。また、顔料を安定な状態で分散させることにより、印刷インキや塗料の流動性が向上し印刷適性が向上するばかりでなく、印刷インキや塗料を製造する際の労力やエネルギーを大きく削減することができる。さらに、安定な状態の分散体は、一般的に貯蔵安定性にも優れる。
しかしながら、印刷インキや塗料に用いられる顔料は、より鮮明な色調を実現するために微細な粒径であることが多く、そのために顔料粒子間の凝集力が強くなり上記のような適性を持たせることは困難であることが多い。
【0003】
このような問題を解決するために、様々な顔料分散剤が開発されている。例えば、特公昭41−2466号公報に開示された顔料誘導体や特公昭54−34009号公報、特公昭63−30057号公報等に開示されたポリエステルは、顔料分散剤として一定の効果を示すものの、より高品位の印刷インキ及び塗料を得る目的でより微細な顔料を使用した場合にはその効果は十分とは言えなかった。さらに、近年における環境問題への関心の高まりから、印刷インキおよび塗料に使用される有機溶剤がトルエン等の芳香族系を主成分とするものからエステル系やアルコール系を主成分とするものに変わりつつあり、顔料を分散するためには著しく不利となっている。このような印刷インキ及び塗料においては、上記顔料分散剤の効果は満足されるものとは言えず、全く効果を示さないものも多かった。
【0004】
また、特開平4−246470号公報には、本発明の一般式(1)で示される塩基性官能基含有有機色素誘導体が開示されているが、これらの有機色素誘導体はオフセットインキ用ビヒクルやアルキッド樹脂等の酸性官能基を有するバインダーでは効果を示すものの十分ではなく、ポリウレタン樹脂やポリアミド樹脂等の塩基性官能基を有するバインダーではほとんど効果を示さない。特に、グラビアインキ等に使用される尿素結合を含む塩基性の高いポリウレタン樹脂には全く効果を示さなかった。
【0005】
さらに、特開平3−112992号公報には、本発明の一般式(2)で示されるリン酸エステルが分散剤として開示されているが、実際に有機顔料に使用しても分散剤としての効果は全く示さない。
また、特開2001−164142号公報には、表面が塩基性であるフタロシアニン系顔料をリン酸エステル系顔料分散剤を用いて分散してなる顔料分散体組成物が開示されている。しかし、表面が塩基性であるフタロシアニン系顔料を得る具体的な手段は記載されておらず、特定の市販顔料に対してのみ有効であるに過ぎなかった。
【0006】
【発明が解決しようとする課題】
そこで、本発明は、印刷インキまたは塗料に使用した場合の流動性、分散安定性ならびに乾燥皮膜にした場合の光沢等に優れる顔料組成物およびそれを用いた顔料分散体を提供することを目的とする。
【0007】
【課題を解決するための手段】
本発明者は、有機顔料またはカーボンブラック顔料、特定の塩基性官能基含有有機色素誘導体および特定のリン酸エステルを含む顔料組成物が、印刷インキまたは塗料に使用した場合の流動性、分散安定性ならびに乾燥皮膜にした場合の光沢等に優れることを発見し、本発明を完成させるに至った。
【0008】
すなわち、本発明は、有機顔料またはカーボンブラック顔料、下記一般式(1)で示される塩基性官能基含有有機色素誘導体および下記一般式(2)で示されるリン酸エステルを含む顔料組成物を提供する。
一般式(1)
P−[X1−(CH2m−N(R1,R2)]n
(式中、Pは有機色素残基、X1は−CH2NH−、−SO2NH−、−CH2NHCO−、−CH2NHCOCH2NH−、−CONH−から選ばれる2価の連結基、R1,R2はそれぞれ独立に水素原子、置換基を有してもよいアルキル基、アリール基またはR1,R2で窒素原子または酸素原子を含んでも良い複素環、mは1〜4の整数、nは1〜4の整数を表す。)
一般式(2)
【化2】

Figure 0003931649
(式中、R3は数平均分子量500〜30000のポリエーテル及び/またはポリエステル、yは1または2を表す。)
【0009】
また、本発明は、上記顔料組成物0.1〜50重量%、樹脂0.01〜50重量%、および有機溶剤50〜99重量%を含む顔料分散体を提供する。
【0010】
【発明の実施の形態】
以下に、本発明を詳細に説明する。
本発明の有機顔料としては、通常印刷インキまたは塗料に用いられるすべての顔料が使用でき、具体的には、例えば溶性アゾ顔料、不溶性アゾ顔料、フタロシアニン顔料、キナクリドン顔料、イソインドリノン顔料、ペリレン顔料、ペリノン顔料、ジオキサジン顔料、アントラキノン顔料、ジアンスラキノニル顔料、アンスラピリミジン顔料、アンサンスロン顔料、インダンスロン顔料、フラバンスロン顔料、ピランスロン顔料、ジケトピロロピロール顔料等が挙げられる。
また、本発明のカーボンブラック顔料としては、通常色材として用いられるあらゆる種類のカーボンブラック顔料が使用できる。
【0011】
本発明の塩基性性官能基含有有機色素誘導体は、一般に知られている有機色素骨格に塩基性官能基を導入することで得ることができ、特公昭58−28303号公報、特公昭59−40172号公報、特開昭58−167654号公報、特開昭59−168070号公報、特公昭63−20869号公報、特公昭58−28303号公報、特公平1−34268号公報、特公平1−34269号公報等に開示された公知のものである。ここでいう有機色素骨格としては、溶性アゾ系、不溶性アゾ系、フタロシアニン系、キナクリドン系、イソインドリノン系、ペリレン系、ペリノン系、ジオキサジン系、アントラキノン系、ジアンスラキノニル系、アンスラピリミジン系、アンサンスロン系、インダンスロン系、フラバンスロン系、ピランスロン系、ジケトピロロピロール系、キノフタロン系、チオインジコ系等が挙げられ、アントラキノンのようにほとんど着色していない化合物であっても構わない。
【0012】
本発明における一般式(1)のX1は、−CH2NH−、−SO2NH−、−CH2NHCO−、−CH2NHCOCH2NH−、−CONH−から選ばれる2価の連結基である。これらの結合基を有する塩基性官能基含有有機色素誘導体は、一般式(2)で示されるリン酸エステルとの組み合わせで優れた顔料分散性能を発揮するのみならず、耐性に優れた化合物であり、耐熱性においては通常の有機顔料と比べてもほとんど遜色がない。
【0013】
本発明における一般式(1)のR1 、R2は、それぞれ独立に水素原子、置換基を有してもよいアルキル基、アリール基、またはR1 、R2 で窒素原子または酸素原子を含んでもよい複素環であって、アルキル基およびアリール基の好ましい炭素数は1〜20であり、さらに好ましくは1〜6である。置換基の好ましい例としては、フッ素原子、塩素原子、臭素原子等のハロゲン原子、水酸基、メルカプト基が挙げられる。また、窒素原子または酸素原子を含んでもよい複素環の好ましい例としては、ピペリジノ基、ピペラジノ基、N−メチルピペラジノ基、ピロリジノ基、モルホリノ基チアゾリジノ基等が挙げられる。
【0014】
本発明における一般式(2)で示されるリン酸エステルは公知の化合物であり、特開平3−112992号公報に開示された方法で容易に得ることができる。
本発明における一般式(2)のR3は、数平均分子量500〜30000のポリエーテル及び/またはポリエステルであって、さらに詳しくはポリエーテル、ポリエステルまたはポリエーテル−ポリエステルのコポリマーである。
【0015】
ポリエーテルの好ましい例としては、ポリエチレングリコール、ポリプロピレングリコール、ポリテトラメチレングリコール、ポリブチレングリコール等が挙げられる。また、ポリエステルの好ましい例としては、プロピオラクトン、バレロラクトン、カプロラクトンまたはそれらの混合物の重合体、またはコハク酸、アジピン酸、セバシン酸、アゼライン酸等の脂肪族ジカルボン酸、テレフタル酸、イソフタル酸等の芳香族ジカルボン酸またはそれらの低級アルコールエステルと、エチレングリコール、1,3−プロピレングリコール、1,4−ブチレングリコール、1,6−ヘキサングリコール、ジエチレングリコール、ネオペンチルグリコール、あるはビスフェノールAのエチレンオキサイド付加物等またはこれらの混合物との重合物等が挙げられる。
【0016】
一般式(2)のR3がポリエーテル−ポリエステルのコポリマーである場合は、ポリエーテル−ポリエステルのブロックコポリマーが特に好ましく、ポリエステルブロックとポリエーテルブロックは上記のポリエステルおよびポリエーテルのいずれを用いてもよいが、特に好ましくは下記一般式(3)で示される化合物である。
一般式(3)
−[(CH2 )a−COO]b−[(CH22O]c−R4
(式中、R4は炭素数1〜4のアルキル基、aは4〜5の整数、bは2〜15の数、cは3〜15の数を表す。)
また、一般式(2)のR3は、末端にリン酸エステル構造を含んでもよいが、リン酸エステルを含まないポリエーテルおよびまたはポリエステルの方がより好ましい。
【0017】
本発明の顔料組成物の有機顔料またはカーボンブラック顔料、一般式(1)で示される塩基性官能基含有有機色素誘導体および一般式(2)で示されるリン酸エステルの好ましい組成比は、有機顔料またはカーボンブラック顔料50〜98重量%、一般式(1)で示される塩基性官能基含有有機色素誘導体0.1〜20重量%、一般式(2)で示されるリン酸エステル1〜30重量%であり、さらに好ましくは、有機顔料またはカーボンブラック顔料65〜95重量%、一般式(1)で示される塩基性官能基含有有機色素誘導体2〜15重量%、一般式(2)で示されるリン酸エステル2〜20重量%である。
【0018】
一般式(1)で示される塩基性官能基含有有機色素誘導体の含有量が0.1重量%より少ないとインキ等の流動性や乾燥皮膜の光沢向上効果がほとんど認められず、20重量%より多いと用いた分の効果が得られず経済的に不利である。また、一般式(2)で示されるリン酸エステルの含有量が1重量%よりも少ないと満足のいく効果が得らにくく、30重量%よりも多くても用いた分の効果が得られず経済的に不利である。
【0019】
本発明の顔料組成物は、樹脂および有機溶剤に分散することにより、顔料分散体とし、インキ、塗料等として使用することができる。
顔料分散体には、通常の塗料またはインキに使用されるあらゆる樹脂を使用することができ、樹脂としては、例えば、ニトロセルロース、酢酸セルロース、エチルセルロース、ウレタン樹脂、ポリアミド樹脂、ポリビニルブチラール樹脂、アクリル樹脂、ポリエステル樹脂、アルキド樹脂、ライムロジン、トール油ロジン、ウッドロジン、ロジンエステル、ロジン変成フェノール、石油樹脂、アマニ油、桐油、大豆油、マレイン酸樹脂、ビニル樹脂、環化ゴム、塩化ゴム、エチレンー酢酸ビニル樹脂、ギルソナイト、ダンマル、セラック、エポキシ樹脂、塩化ビニル、シリコン樹脂、メラミン樹脂、尿素樹脂、ベンゾグアナミン樹脂等が挙げられる。
本発明の顔料分散体には、上記の樹脂のうち1種類またはそれ以上を使用しても良く、1種類またはそれ以上の樹脂を用いて分散した高濃度顔料分散体を他の樹脂で希釈して使用しても良い。
【0020】
上記樹脂のうち、重量平均分子量が5000〜100000の通常インキ等のバインダーに用いられるウレタン樹脂は、従来の顔料分散剤や、本発明の有機色素誘導体またはリン酸エステルの単独使用では顔料分散が極めて困難な樹脂であるが、本発明の顔料組成物を使用すると、良好に顔料を分散することができる。一般的に印刷インキ等のバインダーに使用されるウレタン樹脂は、ポリヒドロキシ化合物とポリイソシアネートとの反応により得られる成分を主骨格とし、バインダーとしての性能を付与する目的でしばしばグリコール類、ジアミン類、アミノアルコール類等の化合物を1種または2種以上用いて鎖延長反応と呼ばれる反応によって高分子量化されることが多い。これらのウレタン樹脂のうち、ジアミン類またはアミノアルコール類により鎖延長反応を行うことにより得られる、樹脂1分子中に少なくとも1個以上の尿素結合を有する塩基性の比較的強いウレタン樹脂に本発明の顔料組成物を分散する場合に、顕著な顔料分散効果を示す。このような塩基性樹脂は塩基性官能基含有有機色素誘導体との相互作用がほとんどないため、塩基性樹脂を含む顔料分散体においては、塩基性官能基含有有機色素誘導体は分散剤としての性能をほとんど示さないことが知られている。しかし、本発明のリン酸エステルを併用するとリン酸エステルが選択的に塩基性官能基含有有機色素誘導体と相互作用を起こすことで特異的に優れた分散性能を発揮する。
【0021】
本発明の顔料分散体に用いられる有機溶剤としては、トルエン等の芳香族炭化水素、ミネラルスピリット等の石油系炭化水素、クロロベンゼン等のハロゲン炭化水素、アセトン、メチルエチルケトン、メチルイソブチルケトン、シクロヘキサノン等のケトン類、酢酸エチル、酢酸ブチル、酢酸アミル、2−エトキシエチルアセタート等のエステル類、メタノール、エタノール、プロパノール、ブタノール等のアルコール類、エチルセロソルブ、ブチルセロソルブ等のセロソルブ類等が挙げられる。上記有機溶剤のうち、特に好ましいのは、ケトン類、アルコール類、セロソルブ類、エステル類等の極性の高い有機溶剤である。有機溶剤は、2種またはそれ以上の混合物であっても差し支えない。
【0022】
本発明の顔料分散体を製造する際には、通常印刷インキまたは塗料を製造する際に用いられるすべての分散機が使用でき、このような分散機としては、例えば、ディゾルバー、ハイスピードミキサー、ホモミキサー、ニーダー、フラッシャー、ロールミル、サンドミル、アトライター等が挙げられる。
本発明の顔料組成物および顔料分散体は、印刷インキまたは塗料に使用することができ、その場合に用いられる添加剤としては、消泡剤、レベリング剤、アンチブロッキング剤、界面活性剤、粘度調整剤、ワックス等が挙げられる。
【0023】
【実施例】
以下、実施例により本発明を説明する。例中、部とは重量部を、%とは重量%をそれぞれ表わす。また、本発明の塩基性官能基含有有機色素誘導体の例を表1に示すが、実施例中の記号は表中に示した記号と同じである。
【表1】
Figure 0003931649
【0024】
(リン酸エステルの製造例)
窒素雰囲気下で、数平均分子量750のポリエチレングリコールモノメチルエーテル1125部、ε−カプロラクトン684部およびジブチルスズラウレート1.8部を加熱、攪拌し160℃で固形分が98%以上になるまで反応を続け、ポリエーテル−ポリエステルモノヒドロキシ化合物を得た。得られたポリエーテル−ポリエステルモノヒドロキシ化合物の数平均分子量は、1200であった。5酸化リンを含量84%のポリリン酸84.5部を先に得られたポリエーテル−ポリエステルモノヒドロキシ化合物1200部に加え、水分を除去しながら80℃で5時間反応させ、数平均分子量1280のリン酸モノエステルを得た。
【0025】
(実施例1〜4)
銅フタロシアニン顔料(C.I.Pigment Blue15:3)20部、グラビアインキ用ワニス(ウレタン樹脂15%、酢酸エチル65%、イソプロピルアルコール20%)80部、有機色素誘導体▲1▼2部、製造例で得られたリン酸モノエステル2部および2mmスチールボール300部と混合しペイントコンディショナーで60分間分散して顔料分散体を作成した。同様に銅フタロシアニン顔料、有機色素誘導体▲1▼の代わりに、表2に示す種々の顔料、有機色素誘導体▲2▼〜▲4▼を用いて顔料分散体を作成した。作成した顔料分散体の粘度をB型粘度計(6rpm)で測定した結果および作成した顔料分散体に溶剤(酢酸エチル70%、イソプロピルアルコール30%からなる)を加え、ザーンカップNO.3で14〜16秒に調整して作成したグラビアインキをバーコーターで展色した際の乾燥皮膜の光沢値(60゜)を表2に示す。
なお、上記のウレタン樹脂としては、3−メチル−1,5−ペンタンジオールとアジピン酸を縮重合したポリエステルポリオールとイソホロンジイソシアネートを縮重合して得られたプレポリマーをイソホロンジアミンで鎖延長した重量平均分子量約30000の尿素結合含有ウレタン樹脂を用いた。
【0026】
(実施例5)
実施例1において、有機色素誘導体▲1▼2部を0.2部に、製造例で得られたリン酸モノエステル2部を0.2部に変え、それ以外は全く同様の方法で顔料分散体を作成し、粘度と乾燥皮膜の光沢値を測定した。結果を表2に示す。
(実施例6)
実施例1において、ウレタン樹脂の代わりにニトロセルロースを用いて、それ以外は全く同様の方法で顔料分散体を作成し、粘度と乾燥皮膜の光沢値を測定した。結果を表2に示す。
【0027】
(実施例7)
実施例1において、銅フタロシアニン顔料20部の代わりにカーボンブラック50部を、有機色素誘導体▲1▼2部の代わりに、有機色素誘導体▲5▼2部を用いて、それ以外は全く同様の方法で顔料分散体を作成し、粘度と乾燥皮膜の光沢値を測定した。結果を表2に示す。
(比較例)
実施例1〜7において、有機色素誘導体またはリン酸エステル化合物を用いずに顔料分散体を作成し、粘度と乾燥皮膜の光沢値を測定した。結果を表2に示す。
【0028】
【表2】
Figure 0003931649
【0029】
【発明の効果】
本発明により、印刷インキまたは塗料に使用した場合の流動性、分散安定性ならびに乾燥皮膜にした場合の光沢等に優れ、従来の顔料分散剤や、有機色素誘導体またはリン酸エステルの単独使用では顔料分散が極めて困難なポリウレタン樹脂にも良好に分散する顔料組成物が得られるようになった。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pigment composition excellent in fluidity and dispersion stability when used in printing inks or paints, and gloss and the like when formed into a dry film, and a pigment dispersion using the same.
[0002]
[Prior art]
In printing inks, paints, and the like, pigments are dispersed in a fine state so that printed or coated products have suitability such as clear color tone and gloss. Dispersion of pigments in a stable state not only improves the fluidity of printing inks and paints and improves printability, but also greatly reduces labor and energy when manufacturing printing inks and paints. it can. Furthermore, the dispersion in a stable state is generally excellent in storage stability.
However, pigments used in printing inks and paints often have a fine particle size in order to achieve a clearer color tone, and as a result, the cohesive force between the pigment particles is increased and the above-mentioned suitability is imparted. This is often difficult.
[0003]
In order to solve such problems, various pigment dispersants have been developed. For example, although the pigment derivatives disclosed in Japanese Patent Publication No. 41-2466 and the polyesters disclosed in Japanese Patent Publication No. 54-34009, Japanese Patent Publication No. 63-30057 and the like show a certain effect as a pigment dispersant, When finer pigments were used for the purpose of obtaining higher quality printing inks and paints, the effect was not sufficient. Furthermore, due to increasing interest in environmental issues in recent years, organic solvents used in printing inks and paints have changed from those based on aromatics such as toluene to those based on esters and alcohols. However, it is extremely disadvantageous for dispersing the pigment. In such printing inks and paints, it cannot be said that the effect of the pigment dispersant is satisfactory, and many of them do not exhibit the effect at all.
[0004]
JP-A-4-246470 discloses basic functional group-containing organic dye derivatives represented by the general formula (1) of the present invention. These organic dye derivatives are used in offset ink vehicles and alkyds. A binder having an acidic functional group such as a resin is not sufficient, although an effect is not sufficient, and a binder having a basic functional group such as a polyurethane resin or a polyamide resin has little effect. In particular, it was not effective at all with a highly basic polyurethane resin containing a urea bond used for gravure ink or the like.
[0005]
Further, JP-A-3-112992 discloses the phosphoric acid ester represented by the general formula (2) of the present invention as a dispersant, but even if it is actually used as an organic pigment, the effect as a dispersant is disclosed. Does not show at all.
Japanese Patent Laid-Open No. 2001-164142 discloses a pigment dispersion composition obtained by dispersing a phthalocyanine pigment having a basic surface using a phosphate ester pigment dispersant. However, no specific means for obtaining a phthalocyanine pigment having a basic surface has been described, and it has only been effective for specific commercial pigments.
[0006]
[Problems to be solved by the invention]
Accordingly, the present invention has an object to provide a pigment composition excellent in fluidity, dispersion stability when used in printing inks or paints, and gloss when dried, and a pigment dispersion using the same. To do.
[0007]
[Means for Solving the Problems]
The inventor of the present invention describes fluidity and dispersion stability when a pigment composition containing an organic pigment or carbon black pigment, a specific basic functional group-containing organic dye derivative and a specific phosphate ester is used in printing ink or paint. In addition, the present inventors have found that it is excellent in gloss and the like when formed into a dry film, and has completed the present invention.
[0008]
That is, the present invention provides a pigment composition comprising an organic pigment or a carbon black pigment, a basic functional group-containing organic dye derivative represented by the following general formula (1), and a phosphate ester represented by the following general formula (2). To do.
General formula (1)
P- [X 1 - (CH 2 ) m -N (R 1, R 2)] n
(Wherein, P is an organic pigment residue, X 1 is -CH 2 NH -, - SO 2 NH -, - CH 2 NHCO -, - CH 2 NHCOCH 2 NH -, - CONH- 2 divalent linking of selected from The groups R 1 and R 2 are each independently a hydrogen atom, an alkyl group that may have a substituent, an aryl group, or a heterocyclic ring that may contain a nitrogen atom or an oxygen atom in R 1 and R 2; 4 represents an integer, and n represents an integer of 1 to 4.)
General formula (2)
[Chemical 2]
Figure 0003931649
(In the formula, R 3 represents a polyether and / or polyester having a number average molecular weight of 500 to 30,000, and y represents 1 or 2.)
[0009]
Moreover, this invention provides the pigment dispersion containing 0.1-50 weight% of said pigment compositions, 0.01-50 weight% of resin, and 50-99 weight% of organic solvents.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is described in detail below.
As the organic pigment of the present invention, all pigments usually used for printing inks or paints can be used. Specifically, for example, soluble azo pigments, insoluble azo pigments, phthalocyanine pigments, quinacridone pigments, isoindolinone pigments, perylene pigments. Perinone pigment, dioxazine pigment, anthraquinone pigment, dianthraquinonyl pigment, anthrapyrimidine pigment, ansanthrone pigment, indanthrone pigment, flavanthrone pigment, pyranthrone pigment, diketopyrrolopyrrole pigment and the like.
In addition, as the carbon black pigment of the present invention, any type of carbon black pigment that is usually used as a color material can be used.
[0011]
The basic functional group-containing organic dye derivative of the present invention can be obtained by introducing a basic functional group into a generally known organic dye skeleton. Japanese Patent Publication No. 58-28303 and Japanese Patent Publication No. 59-40172. JP, 58-167654, JP 59-168070, JP 63-20869, JP 58-28303, JP 1-334268, JP 1-334269 It is a well-known thing disclosed by gazette etc. Examples of the organic dye skeleton include soluble azo series, insoluble azo series, phthalocyanine series, quinacridone series, isoindolinone series, perylene series, perinone series, dioxazine series, anthraquinone series, dianthraquinonyl series, anthrapyrimidine series, Anthanthrone type, indanthrone type, flavanthrone type, pyranthrone type, diketopyrrolopyrrole type, quinophthalone type, thioindico type and the like may be mentioned, and a compound that is hardly colored like anthraquinone may be used.
[0012]
X 1 is, -CH 2 NH in general formula (1) in the present invention -, - SO 2 NH -, - CH 2 NHCO -, - CH 2 NHCOCH 2 NH -, - 2 divalent linking group selected from CONH- It is. These basic functional group-containing organic dye derivatives having these linking groups not only exhibit excellent pigment dispersion performance in combination with the phosphate ester represented by the general formula (2), but also are excellent in resistance. In terms of heat resistance, it is almost inferior to ordinary organic pigments.
[0013]
In the present invention, R 1 and R 2 in the general formula (1) each independently represent a hydrogen atom, an alkyl group which may have a substituent, an aryl group, or a nitrogen atom or an oxygen atom in R 1 and R 2. In the heterocyclic ring, the alkyl group and the aryl group preferably have 1 to 20 carbon atoms, more preferably 1 to 6 carbon atoms. Preferable examples of the substituent include halogen atoms such as fluorine atom, chlorine atom and bromine atom, hydroxyl group and mercapto group. Preferred examples of the heterocyclic ring that may contain a nitrogen atom or an oxygen atom include a piperidino group, piperazino group, N-methylpiperazino group, pyrrolidino group, morpholino group thiazolidino group and the like.
[0014]
The phosphate ester represented by the general formula (2) in the present invention is a known compound and can be easily obtained by the method disclosed in JP-A-3-112992.
In the present invention, R 3 in the general formula (2) is a polyether and / or polyester having a number average molecular weight of 500 to 30,000, more specifically a polyether, polyester or polyether-polyester copolymer.
[0015]
Preferable examples of the polyether include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polybutylene glycol and the like. Preferred examples of the polyester include propiolactone, valerolactone, caprolactone, or a polymer thereof, or aliphatic dicarboxylic acids such as succinic acid, adipic acid, sebacic acid, and azelaic acid, terephthalic acid, isophthalic acid, and the like. Aromatic dicarboxylic acids or their lower alcohol esters and ethylene glycol, 1,3-propylene glycol, 1,4-butylene glycol, 1,6-hexane glycol, diethylene glycol, neopentyl glycol, or ethylene oxide of bisphenol A Examples thereof include an adduct and the like, and a polymer with a mixture thereof.
[0016]
When R 3 in the general formula (2) is a polyether-polyester copolymer, a polyether-polyester block copolymer is particularly preferred, and any of the above polyesters and polyethers may be used as the polyester block and the polyether block. Particularly preferred are compounds represented by the following general formula (3).
General formula (3)
- [(CH 2) a- COO] b - [(CH 2) 2 O] c-R 4
(In the formula, R 4 represents an alkyl group having 1 to 4 carbon atoms, a represents an integer of 4 to 5, b represents a number of 2 to 15, and c represents a number of 3 to 15).
In addition, R 3 in the general formula (2) may contain a phosphate ester structure at the terminal, but a polyether and / or polyester containing no phosphate ester is more preferable.
[0017]
The preferred composition ratio of the organic pigment or carbon black pigment of the pigment composition of the present invention, the basic functional group-containing organic dye derivative represented by the general formula (1) and the phosphate ester represented by the general formula (2) is an organic pigment. Alternatively, carbon black pigment 50 to 98% by weight, basic functional group-containing organic dye derivative represented by general formula (1) 0.1 to 20% by weight, phosphate ester 1 to 30% by weight represented by general formula (2) More preferably, the organic pigment or carbon black pigment is 65 to 95% by weight, the basic functional group-containing organic dye derivative represented by the general formula (1) is 2 to 15% by weight, and the phosphorus represented by the general formula (2) is used. The acid ester is 2 to 20% by weight.
[0018]
When the content of the basic functional group-containing organic dye derivative represented by the general formula (1) is less than 0.1% by weight, the fluidity of ink and the gloss improvement effect of the dried film are hardly recognized, and the content is more than 20% by weight. If the amount is too large, the effect of the used amount cannot be obtained, which is economically disadvantageous. Further, if the content of the phosphate ester represented by the general formula (2) is less than 1% by weight, it is difficult to obtain a satisfactory effect, and if it is more than 30% by weight, the effect of the used amount cannot be obtained. It is economically disadvantageous.
[0019]
The pigment composition of the present invention is dispersed in a resin and an organic solvent to form a pigment dispersion, which can be used as an ink, a paint, or the like.
For the pigment dispersion, any resin used in ordinary paint or ink can be used. Examples of the resin include nitrocellulose, cellulose acetate, ethylcellulose, urethane resin, polyamide resin, polyvinyl butyral resin, and acrylic resin. , Polyester resin, alkyd resin, lime rosin, tall oil rosin, wood rosin, rosin ester, rosin modified phenol, petroleum resin, linseed oil, tung oil, soybean oil, maleic acid resin, vinyl resin, cyclized rubber, chlorinated rubber, ethylene-vinyl acetate Examples thereof include resin, gilsonite, dammar, shellac, epoxy resin, vinyl chloride, silicon resin, melamine resin, urea resin, and benzoguanamine resin.
One or more of the above resins may be used in the pigment dispersion of the present invention, and a high concentration pigment dispersion dispersed using one or more resins may be diluted with another resin. May be used.
[0020]
Among the above resins, urethane resins used for binders such as ordinary ink having a weight average molecular weight of 5,000 to 100,000 are extremely pigment-dispersed when a conventional pigment dispersant or the organic dye derivative or phosphate ester of the present invention is used alone. Although it is a difficult resin, when the pigment composition of the present invention is used, the pigment can be dispersed well. In general, urethane resins used for binders such as printing inks have a main skeleton as a component obtained by the reaction of a polyhydroxy compound and a polyisocyanate, and are often glycols, diamines, for the purpose of imparting performance as a binder. In many cases, one or more compounds such as amino alcohols are used to increase the molecular weight by a reaction called chain extension reaction. Among these urethane resins, the basic relatively strong urethane resin having at least one urea bond in one molecule of the resin, which is obtained by performing a chain extension reaction with diamines or amino alcohols. When the pigment composition is dispersed, a remarkable pigment dispersion effect is exhibited. Since such a basic resin has little interaction with a basic functional group-containing organic dye derivative, in a pigment dispersion containing a basic resin, the basic functional group-containing organic dye derivative has a performance as a dispersant. It is known to show little. However, when the phosphate ester of the present invention is used in combination, the phosphate ester selectively interacts with the basic functional group-containing organic dye derivative to exhibit a particularly excellent dispersion performance.
[0021]
Examples of the organic solvent used in the pigment dispersion of the present invention include aromatic hydrocarbons such as toluene, petroleum hydrocarbons such as mineral spirits, halogen hydrocarbons such as chlorobenzene, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone. , Esters such as ethyl acetate, butyl acetate, amyl acetate and 2-ethoxyethyl acetate, alcohols such as methanol, ethanol, propanol and butanol, cellosolves such as ethyl cellosolve and butyl cellosolve, and the like. Of the organic solvents, particularly preferred are highly polar organic solvents such as ketones, alcohols, cellosolves and esters. The organic solvent can be a mixture of two or more.
[0022]
In the production of the pigment dispersion of the present invention, all the dispersers that are usually used in the production of printing inks or paints can be used. Examples of such dispersers include a dissolver, a high speed mixer, a homogenizer, and the like. Examples include a mixer, a kneader, a flasher, a roll mill, a sand mill, and an attritor.
The pigment composition and the pigment dispersion of the present invention can be used in printing inks or paints, and additives used in such cases include antifoaming agents, leveling agents, antiblocking agents, surfactants, and viscosity adjustments. Agents, waxes and the like.
[0023]
【Example】
Hereinafter, the present invention will be described by way of examples. In the examples, “part” represents “part by weight” and “%” represents “% by weight”. Moreover, although the example of the basic functional group containing organic pigment | dye derivative | guide_body of this invention is shown in Table 1, the symbol in an Example is the same as the symbol shown in the table | surface.
[Table 1]
Figure 0003931649
[0024]
(Production example of phosphate ester)
In a nitrogen atmosphere, 1125 parts of polyethylene glycol monomethyl ether having a number average molecular weight of 750, 684 parts of ε-caprolactone and 1.8 parts of dibutyltin laurate are heated and stirred, and the reaction is continued at 160 ° C. until the solid content reaches 98% or more. A polyether-polyester monohydroxy compound was obtained. The number average molecular weight of the obtained polyether-polyester monohydroxy compound was 1200. 84.5 parts of polyphosphoric acid having a content of 84% phosphorus pentoxide was added to 1200 parts of the polyether-polyester monohydroxy compound obtained above, and the mixture was allowed to react at 80 ° C. for 5 hours while removing water. A phosphoric acid monoester was obtained.
[0025]
(Examples 1-4)
Copper phthalocyanine pigment (CI Pigment Blue 15: 3) 20 parts, varnish for gravure ink (urethane resin 15%, ethyl acetate 65%, isopropyl alcohol 20%), organic dye derivative (1) 2 parts, production example A pigment dispersion was prepared by mixing with 2 parts of phosphoric acid monoester obtained in the above and 300 parts of 2 mm steel balls and dispersing for 60 minutes with a paint conditioner. Similarly, pigment dispersions were prepared using various pigments and organic dye derivatives (2) to (4) shown in Table 2 instead of the copper phthalocyanine pigment and organic dye derivative (1). The viscosity of the prepared pigment dispersion was measured with a B-type viscometer (6 rpm) and a solvent (consisting of 70% ethyl acetate and 30% isopropyl alcohol) was added to the prepared pigment dispersion. Table 2 shows the gloss value (60 °) of the dried film when the gravure ink prepared by adjusting to 3 to 14 to 16 seconds is developed with a bar coater.
In addition, as said urethane resin, the weight average which carried out the chain extension of the prepolymer obtained by polycondensing the polyester polyol and isophorone diisocyanate which polycondensated 3-methyl- 1,5-pentanediol and adipic acid with isophorone diamine. A urea bond-containing urethane resin having a molecular weight of about 30,000 was used.
[0026]
(Example 5)
In Example 1, the pigment dispersion was changed in exactly the same manner except that 2 parts of the organic dye derivative (1) was changed to 0.2 part and 2 parts of the phosphoric acid monoester obtained in the production example was changed to 0.2 part. A body was prepared and the viscosity and gloss value of the dried film were measured. The results are shown in Table 2.
(Example 6)
In Example 1, a pigment dispersion was prepared in the same manner except that nitrocellulose was used instead of the urethane resin, and the viscosity and gloss value of the dried film were measured. The results are shown in Table 2.
[0027]
(Example 7)
In Example 1, using 50 parts of carbon black instead of 20 parts of the copper phthalocyanine pigment and 2 parts of the organic dye derivative {circle around (5)} instead of 2 parts of the organic dye derivative {circle around (1)} A pigment dispersion was prepared by measuring the viscosity and the gloss value of the dried film. The results are shown in Table 2.
(Comparative example)
In Examples 1 to 7, pigment dispersions were prepared without using organic dye derivatives or phosphate ester compounds, and the viscosity and gloss value of the dried film were measured. The results are shown in Table 2.
[0028]
[Table 2]
Figure 0003931649
[0029]
【The invention's effect】
According to the present invention, it is excellent in fluidity, dispersion stability when used in printing inks or paints, and gloss when formed into a dry film, etc., and a conventional pigment dispersant, an organic dye derivative or a phosphate ester alone is used as a pigment It has become possible to obtain a pigment composition that can be well dispersed in a polyurethane resin that is extremely difficult to disperse.

Claims (4)

有機顔料またはカーボンブラック顔料、下記一般式(1)で示される塩基性官能基含有有機色素誘導体、および下記一般式(2)で示されるリン酸エステルを含む顔料組成物。
一般式(1)
P−[X1−(CH2m−N(R1,R2)]n
(式中、Pは有機色素残基、X1は−CH2NH−、−SO2NH−、−CH2NHCO−、−CH2NHCOCH2NH−、−CONH−から選ばれる2価の連結基、R1,R2はそれぞれ独立に水素原子、置換基を有してもよいアルキル基、アリール基、またはR1,R2で窒素原子または酸素原子を含んでも良い複素環、mは1〜4の整数、nは1〜4の整数を表す。)
一般式(2)
Figure 0003931649
(式中、R3は数平均分子量500〜30000のポリエーテル及び/またはポリエステル、yは1または2を表す。)
A pigment composition comprising an organic pigment or a carbon black pigment, a basic functional group-containing organic dye derivative represented by the following general formula (1), and a phosphate ester represented by the following general formula (2).
General formula (1)
P- [X 1 - (CH 2 ) m -N (R 1, R 2)] n
(Wherein, P is an organic pigment residue, X 1 is -CH 2 NH -, - SO 2 NH -, - CH 2 NHCO -, - CH 2 NHCOCH 2 NH -, - CONH- 2 divalent linking of selected from The groups R 1 and R 2 are each independently a hydrogen atom, an alkyl group that may have a substituent, an aryl group, or a heterocyclic ring that may contain a nitrogen atom or an oxygen atom in R 1 and R 2; Integer of ~ 4, n represents an integer of 1-4)
General formula (2)
Figure 0003931649
(In the formula, R 3 represents a polyether and / or polyester having a number average molecular weight of 500 to 30,000, and y represents 1 or 2.)
有機顔料またはカーボンブラック顔料50〜98重量%、一般式(1)で示される塩基性官能基含有有機色素誘導体0.1〜20重量%、および一般式(2)で示されるリン酸エステル1〜30重量%を含む請求項1記載の顔料組成物。Organic pigment or carbon black pigment 50 to 98% by weight, basic functional group-containing organic dye derivative represented by the general formula (1) 0.1 to 20% by weight, and phosphate ester 1 represented by the general formula (2) The pigment composition according to claim 1, comprising 30% by weight. 請求項1または2記載の顔料組成物0.1〜50重量%、樹脂0.01〜50重量%、および有機溶剤50〜99重量%を含む顔料分散体。A pigment dispersion comprising 0.1 to 50% by weight of the pigment composition according to claim 1 or 2, 0.01 to 50% by weight of a resin, and 50 to 99% by weight of an organic solvent. 樹脂が、1分子中に少なくとも1つの尿素結合を有するウレタン樹脂であることを特徴とする請求項3記載の顔料分散体。The pigment dispersion according to claim 3, wherein the resin is a urethane resin having at least one urea bond in one molecule.
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