JP3904674B2 - Colored resin fine particle aqueous dispersion for water-based ink - Google Patents

Colored resin fine particle aqueous dispersion for water-based ink Download PDF

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Publication number
JP3904674B2
JP3904674B2 JP18280497A JP18280497A JP3904674B2 JP 3904674 B2 JP3904674 B2 JP 3904674B2 JP 18280497 A JP18280497 A JP 18280497A JP 18280497 A JP18280497 A JP 18280497A JP 3904674 B2 JP3904674 B2 JP 3904674B2
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Japan
Prior art keywords
water
ink composition
aqueous dispersion
resin fine
colored resin
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JP18280497A
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Japanese (ja)
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JPH10259337A (en
Inventor
浩幸 井戸川
康明 荻原
敦 岩佐
清和 桜井
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Mitsubishi Pencil Co Ltd
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Mitsubishi Pencil Co Ltd
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Priority to JP18280497A priority Critical patent/JP3904674B2/en
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Description

【0001】
【発明の属する技術分野】
本発明はインキのベースとなる水性インキ用着色樹脂微粒子水性分散液、および筆記時の滲みがなく、サインペンやボールペンなどの筆記具あるいはインキジェット記録装置に有用な水性インキ組成物に関するものである。
【0002】
【従来の技術】
水性サインペン、水性ボールペンなどの筆記具に使用する水性インキの着色成分として、染料および顔料が知られている。
【0003】
染料を使用したインキは、染料が水可溶性のために文字・描線が汗や水で滲んだり消失したりして筆記した文字・描線が不鮮明になる欠点があり、いわゆる耐水性が劣る。また、染料自体は耐光性が劣るので、文字・描線が長期の間に変質するという問題がある。
【0004】
一方、顔料を使用したインキは、耐水性や耐光性に関して問題はないが、長期の間に顔料が凝集したり沈降したりして、ペン先の目詰まり、筆記不良などの問題が発生する。また、筆記具用インキとしては、顔料の微分散化が要求されるので、様々な有色顔料を分散してインキの色数を増やすことは困難な状況である。
【0005】
従来のインキジェット記録装置用インキ組成物としては、水可溶性の酸性染料や塩基性染料などを水性媒体中に溶解し、湿潤剤、pH調整剤、防腐剤などの添加剤を加えてなるインキ組成物などが知られている。
【0006】
【発明が解決しようとする課題】
しかしながら、これらインキ組成物は印刷部が滲んで画像が不鮮明になったり、染料が水可溶性のために記録された画像が汗や水で滲みを生じたり消失したり、また、混色により色が濁るという欠点がある。本来、水溶性染料は耐光性が劣り、印刷物を長期間保存すると画像が変質するという問題がある。また、これらインキ組成物は長期間の保存や繰り返し印刷などにより、インキの物性が変化したり沈殿物を生じたりして、ノズルの目詰まりやインキ吐出に著しい障害を起こし、印刷不良を発生するという欠点がある。
【0007】
本発明は、上述の欠点や問題点を解決するためになされたものであり、沈殿物の生じない安定なインキ組成物のベースとなる充分な濃度を有する水性インキ用着色樹脂微粒子水性分散液を提供することを目的とする。
【0008】
本発明のもう一つの目的は、鮮明で、水や汗によって滲んだり消失したりすることがなく、長期間変質しない耐光性に優れた文字、描線を与える筆記具用水性インキ組成物を提供することである。
【0009】
本発明のさらなる目的は、水や汗によって記録された画像が滲みを生じたり消失したりすることのない、印刷部が滲まない鮮明な画像を与え、印刷物を長期間保存しても画像が変質しない耐光性に優れた、混色によって色が濁らないインキジェット記録装置用インキ組成物を提供することである。
【0010】
【課題を解決するための手段】
本発明の水性インキ用着色樹脂微粒子水性分散液は、酸性官能基として水への溶解度が10重量%以下のカルボキシル基含有ビニルモノマーを5〜90重量%含有すると共に、シアノ基、トリアジン環およびフッ素基のうち少なくとも一つの置換基を有するビニルモノマーを含有し、かつ、残部に疎水性ビニルモノマーを含有し、水溶性塩基性染料をモノマー全量に対して0.2〜50重量%を溶解し、当該混合ビニルモノマーに対し、0.1〜50重量%の重合性界面活性剤の存在下で乳化重合して調製される。
【0014】
本発明の水性インキ組成物は、上記記載の水性インキ用着色樹脂微粒子水性分散液と、水溶性有機溶媒と、水とを含有する。好ましくは、インキ組成物総量に対して、前記水性インキ用着色樹脂微粒子水性分散液の含有量が3〜30重量%(樹脂固形分換算)、前記水溶性有機溶媒の含有量が5〜80重量%、前記水の含有量が30〜90重量%である。
【0015】
本発明の筆記具用水性インキ組成物は、上記記載の水性インキ用着色樹脂微粒子水性分散液と、水溶性有機溶媒と、水とを含有する。好ましくは、インキ組成物総量に対して、前記水性インキ用着色樹脂微粒子水性分散液の含有量が3〜30重量%(樹脂固形分換算)、前記水溶性有機溶媒の含有量が5〜80重量%、前記水の含有量が30〜90重量%である。
【0016】
本発明のインキジェット記録装置用水性インキ組成物は、上記記載の水性インキ用着色樹脂微粒子水性分散液と、水溶性有機溶媒と、水とを含有する。好ましくは、インキ組成物総量に対して、前記水性インキ用着色樹脂微粒子水性分散液の含有量が3〜30重量%(樹脂固形分換算)、前記水溶性有機溶媒の含有量が5〜80重量%、前記水の含有量が30〜90重量%である。
【0017】
【発明の実施の形態】
本発明の水性インキ用着色樹脂微粒子水性分散液は、水溶性塩基性染料を溶解した酸性基を有するビニルモノマーを含む混合ビニルモノマーを、過硫酸アンモニウム、過硫酸カリウム、過酸化水素などを重合開始剤とし、または、必要ならば還元剤を併用するかたちで開始剤とし、重合性界面活性剤を用いて乳化共重合することによって調製される。以上のようにして得られた水性インキ用着色樹脂微粒子水性分散液は、通常、樹脂固形分20〜50重量%の濃厚液で得られる。
【0018】
この濃厚液で得られた水性インキ用着色樹脂微粒子水性分散液を、水および水溶性有機溶媒で希釈して樹脂固形分3〜30重量%に調製することにより本発明の水性インキ組成物が得られる。
【0019】
本発明に係わる着色樹脂微粒子水性分散液の調製に用いる酸性官能基を有するビニルモノマーは、カルボキシル基、スルフォン基などの酸性官能基を有するビニルモノマーであれば特に制限はなく、例えば、アクリル酸、メタクリル酸、コハク酸2−メタクリロイルオキシエチル〔三菱レイヨン(株)製、“アクリルエステルSA”〕、フタル酸2−メタクリロイルオキシエチル〔三菱レイヨン(株)製、“アクリルエステルPA”〕、ヘキサヒドロフタル酸2−メタクリロイルオキシエチル〔三菱レイヨン(株)製、“アクリルエステルHH”〕、p−スチレンスルホン酸、2−スルホエチルメタクリレート〔三菱レイヨン(株)製、“アクリルエステルSEM”〕などがあげられる。
【0020】
また、酸性官能基を有するビニルモノマーのような親水性モノマー単独では、乳化重合できないことが多く、疎水性ビニルモノマーを混合して乳化重合を行うのが好ましい。
【0021】
この疎水性ビニルモノマーとしては、特に制限することはなく、例えば、アクリル酸メチル、アクリル酸エチル、アクリル酸n−プロピル、アクリル酸n−ブチルなどのアクリル酸エステル類、メタクリル酸メチル、メタクリル酸エチル、メタクリル酸n−プロピル、メタクリル酸n−ブチルなどのメタクリル酸エステル類、スチレン、メチルスチレンなどのスチレン類などがあげられる。また、該乳化重合において、エポキシド基、ヒドロキシメチルアミド基、イソシアネート基などの反応性架橋基を有するモノマーや2つ以上のビニル基を有する多官能性モノマーを混合して架橋してもよい。
【0022】
酸性官能基を有するビニルモノマーの存在によって、水溶性塩基性染料の混合ビニルモノマーへの混和が非常によくなり、その結果、色の濃い着色樹脂微粒子を得ることができる。
【0023】
乳化共重合における酸性官能基を有するビニルモノマーの配合量は、ビニルモノマー全量に対して5〜95重量%が好ましく、少なすぎると水溶性塩基性染料のビニルモノマーへの混和が不十分となり、樹脂微粒子の着色が不十分となり、また、多すぎると乳化共重合に支障をきたす。
【0024】
本発明に係わる着色樹脂微粒子水性分散液の製造に用いるシアノ基を有するビニルモノマーは、アクリロニトリルやメタアクリロニトリルが代表例である。シアノ基を有するビニルモノマーを共重合することにより、得られる着色樹脂微粒子は、より鮮やかな色を呈するようになり、筆記具用インキとしておよびインキジェット記録に十分な濃度と鮮明さを与えるようになり、また、耐光性も一層優れたものとなる。
【0025】
乳化共重合におけるシアノ基を有するビニルモノマーの配合量は、ビニルモノマー全量に対して5〜80重量%が好ましく、少なすぎると、着色樹脂微粒子の発色性や濃度、耐光性などが向上せず、一方、多すぎると乳化共重合に支障をきたす。
【0026】
本発明に係わる乳化共重合には、酸性官能基を有するビニルモノマーおよびシアノ基を有するビニルモノマー以外に他の疎水性ビニルモノマーを混合して混合ビニルモノマーとして乳化共重合を行ってもよい。
【0027】
疎水性ビニルモノマーとしては、特に制限することはなく、例えば、アクリル酸メチル、アクリル酸エチル、アクリル酸n−プロピル、アクリル酸n−ブチルなどのアクリル酸エステル類、メタクリル酸メチル、メタクリル酸エチル、メタクリル酸n−プロピル、メタクリル酸n−ブチルなどのメタクリル酸エステル類、スチレン、メチルスチレンなどのスチレン類などがあげられる。
【0028】
また、該乳化共重合において、エポキシ基、ヒドロキシメチルアミド基、イソシアネート基などの反応性架橋基を有するモノマーや2つ以上のビニル基を有する多官能性モノマーを混合して架橋してもよい。
【0029】
本発明に係わる着色樹脂微粒子水性分散液の調製に用いるトリアジン環含有ビニルモノマーは、トリアリルシアヌレートが代表例である。トリアジン環含有ビニルモノマーを共重合することにより、得られる着色樹脂微粒子は、より鮮やかな色を呈するようになり、筆記具用インキとしておよびインキジェット記録に十分な濃度と鮮明さを与えるようになり、また、耐光性も一層優れたものとなる。乳化共重合におけるトリアジン環含有ビニルモノマーの配合量は、ビニルモノマー全量に対して3〜80重量%が好ましく、少なすぎると着色樹脂微粒子の発色性や濃度、耐光性などが向上せず、一方、多すぎると乳化共重合に支障をきたす。
【0030】
本発明に係わる乳化共重合には、酸性官能基を有するビニルモノマーおよびトリアジン環含有ビニルモノマー以外に他の疎水性ビニルモノマーを混合して混合ビニルモノマーとして乳化共重合を行ってもよい。
【0031】
疎水性ビニルモノマーとしては、特に制限することはなく、例えば、アクリル酸メチル、アクリル酸エチル、アクリル酸n−プロピル、アクリル酸n−ブチルなどのアクリル酸エステル類、メタクリル酸メチル、メタクリル酸エチル、メタクリル酸n−プロピル、メタクリル酸n−ブチルなどのメタクリル酸エステル類、スチレン、メチルスチレンなどのスチレン類などがあげられる。
【0032】
また、該乳化共重合において、エポキシ基、ヒドロキシメチルアミド基、イソシアネート基などの反応性架橋基を有するモノマーや2つ以上のビニル基を有する多官能性モノマーを混合して架橋してもよい。
【0033】
本発明に係る着色樹脂微粒子水性分散液の製造に用いるフッ素基を有するビニルノマーは特に制限されることはなく、例えば、メタクリル酸トリフルオロエチル〔三菱レイヨン(株)製、“アクリルエステル3FE”〕、メタクリル酸ヘプタデカフルオロデシル〔三菱レイヨン(株)製、“アクリルエステル17FE”〕などがあげられる。
【0034】
フッ素基を有するビニルモノマーを共重合することにより、得られる着色微粒子は、より鮮やかな色を呈するようになり、筆記具用インキとしておよびインキジェット記録に充分な濃度と鮮明さを与え、耐光性も優れたものとなる。
【0035】
本発明に係わる乳化共重合には、酸性官能基を有するビニルモノマーおよびフッ素基を有するビニルモノマー以外に他の疎水性ビニルモノマーを混合して混合ビニルモノマーとして乳化共重合を行ってもよい。
【0036】
疎水性ビニルモノマーとしては、特に制限することはなく、例えば、アクリル酸メチル、アクリル酸エチル、アクリル酸プロピル、アクリル酸n−ブチルなどのアクリル酸エステル類、メタクリル酸メチル、メタクリル酸エチル、メタクリル酸n−プロピル、メタクリル酸n−ブチルなどのメタクリル酸エステル類、スチレン、メチルスチレンなどのスチレン類などがあげられる。
【0037】
また、該乳化重合において、エポキシド基、ヒドロキシメチルアミド基、イソシアネート基などの反応性架橋基を有するモノマーや2つ以上のビニル基を有する多官能性モノマーを混合して架橋してもよい。
【0038】
フッ素基を有するビニルモノマーの配合量は、ビニルモノマー全量に対して5〜80重量%が好ましい。配合量が少なすぎると、着色樹脂微粒子の発色性や濃度、耐光性などが向上しない。
【0039】
本発明のもう一つの着色樹脂微粒子水性分散液は、水への溶解度が10重量%以下のカルボキシル基含有ビニルモノマー5〜90重量%含む混合ビニルモノマーに水溶性塩基性染料を溶解し、過硫酸アンモニウム、過硫酸カリウム、過酸化水素などを重合開始剤として、または、これに必要ならば還元剤を併用するかたちで開始剤とし、重合性界面活性剤を用いた乳化重合することにより樹脂固形分20〜50重量%の濃厚液として得られる。これをインキ組成物にするには、水および水溶性有機溶媒で希釈して、樹脂固形分をインキ組成物中3〜30重量%に調製することにより得られる。
【0040】
本発明に係わるもう一つの着色樹脂微粒子水性分散液の調製に用いるカルボキシル基含有ビニルモノマーは、水への溶解度が10重量%以下のビニルモノマーであり、例えば、コハク酸2−メタクリロイルオキシエチル(三菱レイヨン(株)製、アクリルエステルSA、水への溶解度=1.86重量%)、マレイン酸2−メタクリロイルオキシエチル(三菱レイヨン(株)製、アクリルエステルML、水への溶解度=9.17重量%)、フタル酸2−メタクルロイルオキシエチル(三菱レイヨン(株)製、アクリルエステルPA、水への溶解度=0.08重量%)、ヘキサヒドロフタル酸2−メタクリロイルオキシエチル(三菱レイヨン(株)製、アクリルエステルHH、水への溶解度=3.40重量%)などがあげられる。
【0041】
水への溶解度が小さいカルボキシル基含有ビニルモノマーを用いると、混合ビニルモノマー中の酸性モノマーの割合を高めることができ、従って、水溶性塩基性染料のビニルモノマーへ混和できる量が非常に多くなり、その結果、色の濃い着色樹脂微粒子を得ることができる。カルボキシル基含有ビニルモノマーの配合量は、混合ビニルモノマー全量に対して、5〜90重量%が好ましい。配合量が少なすぎると、水溶性塩基性染料のビニルモノマーへ混和できる量が少なく、樹脂微粒子の着色が不十分となり、また、多過ぎると、乳化共重合に支障をきたす。
【0042】
本発明に係わる乳化共重合には、カルボキシル基含有ビニルモノマー以外に他の疎水性ビニルモノマーを混合して混合ビニルモノマーとして乳化共重合を行ってもよい。
【0043】
疎水性ビニルモノマーとしては、特に制限することはなく、例えば、アクリル酸メチル、アクリル酸エチル、アクリル酸n−プロピル、アクリル酸n−ブチルなどのアクリル酸エステル類、メタクリル酸メチル、メタクリル酸エチル、メタクリルn−プロピル、メタクリル酸n−ブチルなどのメタクリル酸エステル類、スチレン、メチルスチレンなどのスチレン類などがあげられる。
【0044】
また、該乳化共重合において、エポキシ基、ヒドロキシメチルアミド基、イソシアネート基などの反応性架橋基を有するモノマーや2つ以上のビニル基を有する多官能性モノマーを配合して架橋してもよい。
【0045】
本発明に係わる着色樹脂微粒子水性分散液の調製に用いる水溶性塩基性染料は、特に制限はなく、例えば「保土谷化学工業(株)製の“AIZEN CATHILON YELLOW 7GLH”(CI BASIC YELLOW 21)」「BASF社製の“BASACRYL GOLDEN YELLOW X−GFL”(CI BASIC YELLOW 28)」「保土谷化学工業(株)製の“AIZEN CATHILON RED BLH 200%”(CI BASIC RED 39)」「BASF社製の“BASACRYL BRILLIANT RED G”(CI BASIC RED 52)」「保土谷化学工業(株)製の“AIZEN CATHILON PURE BLUE 5GH 200%”(CI BASIC BLUE 3)」「BASF社製の“BASACRYL BLUE X−3GL”(CI BASIC BLUE 41)」などがあげられる。乳化共重合時の染料の配合量はモノマー全量に対して0.2〜50重量%の範囲である。
【0046】
本発明に係わる乳化共重合には、通常界面活性剤を用いられるが、その界面活性剤は特に制限はないが重合性界面活性剤が好ましい。
【0047】
重合性界面活性剤としては、アニオン系またはノニオン系であり、例えば、旭電化工業(株)製の“アデカリアソープNE−10”、“同NE−20”、“同NE−30”、“同NE−40”、“同SE−10N”、花王(株)製の“ラテムルS−180”、“同S−180A”、“同S−120A”、三洋化成工業(株)製の“エレミノールJS−2”などが挙げられ、その中から1種類あるいは2種類以上を組み合わせて用いられる。界面活性剤の使用量は、ビニルモノマーに対して0.1〜50重量%が望ましい。
【0048】
本発明に係わる着色樹脂微粒子水性分散液は、従来の界面活性剤を用いて得られたものと比較すると、水性媒体中に表面活性物質が殆ど存在しないため、表面張力が高いものとなる(普通、40dyn/cm以上)。そのため、インキジェット記録装置用インキ組成物に用いたとき、印刷部が滲まない鮮明な画像を得ることが可能となる。また、画像が水や汗によって滲んだり消失したりすることのない、耐水性のある被膜を得ることが可能となる。また、筆記具用インキとして用いたとき、文字、描線は鮮明で、水や汗によって滲んだり消失したりすることがなく、また耐水性のある描線被膜となる。
【0049】
本発明のインキ組成物は、上述したように、着色樹脂微粒子水性分散液の濃厚液を水性有機溶媒および水で希釈することにより得られる。
【0050】
本発明のインキ組成物に用いる水溶性有機溶媒としては、エチレングリコール、トリエチレングリコール、テトラエチレングリコール、ジプロピレングリコール、1,2−プロパンジオール、1,3−プロパンジオール、1,2−ブタンジオール、2,3−ブタンジオール、1,3−ブタンジオール、1,4−ブタンジオール、1,2−ペンタンジオール、1,5−ペンタンジオール、2,5−ヘキサンジオール、3−メチル1,3−ブタンジオール、2メチルペンタン−2,4−ジオール、3−メチルペンタン−1,3,5トリオール、1,2,3−ヘキサントリオール、グリセリンなどのアルキレングリコール類、ポリエチレングリコール、ポリプロピレングリコールなどのポリアルキレングリコール類、グリセロール、ジグリセロール、トリグリセロールなどのグリセロール類、エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル、ジエチレングリコールモノ−n−ブチルエーテルなどのグリコールの低級アルキルエーテル、チオジエタノール、N−メチル−2−ピロリドン、1,3−ジメチル−2−イミダリジノンなどが挙げられる。その含有量はインキ組成物全量に対して5〜80重量%が好ましく、より好ましくは10〜60重量%である。
【0051】
その他にも、たとえばメチルアルコール、エチルアルコール、イソプロピルアルコール、n−ブチルアルコール、tert−ブチルアルコール、イソブチルアルコール、ヘキシルアルコール、オクチルアルコール、ノニルアルコール、デシルアルコール、ベンジルアルコールなどのアルコール類、ジメチルホルムアミド、ジエチルアセトアミドなどのアミド類、アセトンなどのケトン類、N−メチルピロリドン、1,3−ジメチル−2−イミダゾリジノンなどの水溶性溶剤を混合することもできる。
【0052】
また、水の含有量はインキ組成物全量に対して30〜90重量%が好ましく、より好ましくは40〜60重量%である。
【0053】
その他、必要に応じて防腐剤、pH調整剤、消泡剤などを適宜選択して使用することができる。
【0054】
例えば、pH調整剤として、アンモニア、尿素、モノエタノールアミン、ジエタノールアミン、トリエタノールアミン、トリポリン酸ナトリウム、炭酸ナトリウムなど炭酸やリン酸のアルカリ金属塩、水酸化ナトリウムなどのアルカリ金属の水酸化物などがあげられる。
【0055】
防腐剤もしくは防黴剤として、フェノール、ナトリウムオマジン、ペンタクロロフェノールナトリウム、1,2−ベンズイソチアゾリン3−オン、2,3,5,6−テトラクロロ−4(メチルフォニル)ピリジン、安息香酸やソルビン酸やデヒドロ酢酸のアルカリ金属塩、ベンズイミダゾール系化合物などがあげられる。
【0056】
潤滑剤としてポリオキシエチレンラウリルエーテルなどのポリアルキレングリコール誘導体、脂肪酸アルカリ塩、ノニオン系界面活性剤、パーフルオロアルキルリン酸エステルなどのフッ素系界面活性剤、ジメチルポリシロキサンのポリエチレングリコール付加物などのポリエーテル変性シリコーンなどがあげられる。
【0057】
本発明のインキ用着色樹脂微粒子水性分散液は、通常、凝集したり沈殿したりすることはない。このインキ用着色樹脂微粒子水性分散液をインキジェット記録装置用インキ組成物に用いた場合、インキ用着色樹脂微粒子の粒子径が1.0μm以下であるので、インキ組成物が細いノズルを通過するとき、目詰まりを起こさず、高度の安定性が得られる。他方、このインキ用着色樹脂微粒子水性分散液を筆記具用インキ組成物に用いた場合、フェルトペンのような細いペン先を通過するとき、目詰まりを起こさない。
【0058】
さらに、本発明の水性インキ用着色樹脂微粒子水性分散液をインキジェット記録装置用インキ組成物に用いた場合、印刷部が混色によって色が濁ったりすることもなく、鮮明な画像が得られ、その画像が水や汗によって滲んだり消失することもない。また、長期間保存しても画像が変質しない耐光性に優れた印字、印刷物が提供できる。他方、本発明の水性インキ用着色樹脂微粒子水性分散液を筆記具用インキ組成物に用いた場合、水や汗によって滲んだり消失することもなく、混色によって色が濁ったりすることもない、鮮明で、滲まない筆記文字または描線を与える。また、文字、描線を長期間放置しても変質しない耐水性や耐光性に優れたものである。
【0059】
【実施例】
以下に実施例、比較例を示して本発明を更に詳細に説明する。
各例における性能試験は次の方法に従った。
【0060】
(鮮明さ)
PPCコピー用紙に印字した文字の鮮明さを目視により判定した。
○:鮮明である。
△:僅かに濁っている。
×:濁っている。
【0061】
(滲み)
PPCコピー用紙に印字した文字の滲みの程度を目視により判定した。
○:滲まない。
△:僅かに滲む。
×:滲む。
【0062】
(耐水性)
PPCコピー用紙に印字した文字を水に1時間浸漬し、滲みの程度を目視により判定した。
○:滲まない。
△:僅かに滲む。
×:滲む。
【0063】
(耐光性)
PPCコピー用紙に印字した文字をフェードメーターに照射し、褪色が認められた時間を測定した。
【0064】
(保存安定性)
インキ組成物を充填したカートリッジを50℃の恒温槽中に入れ、印字不能となるまでの日数を測定した。
【0065】
(粒子径)
インキ組成物中の着色樹脂微粒子の粒子径は、レーザー散乱式粒度分布測定機〔日機装(株)製、コールターカウンター、モデルN4SD〕を用いて測定した。
【0066】
(粘度)
インキ組成物の粘度は、コーンプレート型回転粘度計〔東京計器(株)、ELD型〕を用いて測定した。測定温度は25℃であった。
【0067】
(表面張力)
インキ組成物の表面張力は、吊り板法によって測定した。測定温度は25℃であった。
【0068】
実施例1
2リットルのフラスコに、撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液漏斗を取り付け、温水槽にセットし、蒸留水500g、重合性界面活性剤〔旭電化工業(株)製“アデカリアソープSE−10N”〕50gおよび過硫酸アンモニウム3gを仕込んで、窒素ガスを導入しながら、内温を50℃まで昇温した。
【0069】
一方、メタクリル酸メチル200g、トリアリルシアヌレート100g、コハク酸2−メタクリロイルオキシエチル〔三菱レイヨン(株)製、“アクリルエステルSA”〕200gからなる混合モノマー500gに、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN CATHILON RED BLH 200%”〕40gを混合した液を調製した。
【0070】
この調製液を上記分液漏斗から温度50℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し、乳化重合を行った。さらに5時間熟成して重合を終了し、着色微粒子水性分散液を得た。
【0071】
この着色微粒子水性分散液に、蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度2.8cp、表面張力50dyn/cmの赤色インキ組成物を得た。
【0072】
赤色インキ組成物中の着色樹脂微粒子の粒子径は0.14μmであった。また、赤色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な赤色を呈した。
【0073】
実施例2
2リットルのフラスコに、撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液漏斗を取り付け、温水槽にセットし、蒸留水500g、重合性界面活性剤〔花王(株)製の“ラテムルS−180”〕40gおよび過硫酸アンモニウム3gを仕込んで、窒素ガスを導入しながら、内温を50℃まで昇温した。
【0074】
一方、スチレン100g、メタクリル酸メチル200g、トリアリルシアヌレート100g、メタクリル酸100gからなる混合モノマー500gに、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN PURE BLUE 5GH 200%”〕30gを撹拌混合した液を調製した。
【0075】
この調製液を上記分液漏斗から温度を50℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し乳化重合を行った。さらに5時間熟成して重合を終了し、着色微粒子水性分散液を得た。
【0076】
この着色微粒子水性分散液に、蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度3.0cp、表面張力52dyn/cmの青色インキ組成物を得た。
【0077】
青色インキ組成物中の着色樹脂微粒子の粒子径は0.13μmであった。また、青色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な赤色を呈した。
【0078】
比較例1
混合モノマー500gを単一のモノマーのメタクリル酸メチル500gに代える以外は、実施例1と同様にインキ組成物を調製した。
【0079】
得られたインキ組成物は粘度9.6cp、表面張力42dyn/cmであり、鮮明さに欠けたものであり、インキ組成物中の着色樹脂微粒子の粒子径は0.34μmであった。
【0080】
比較例2
混合モノマー500gを、メタクリル酸メチル300gおよびトリアリルシアヌレート200gからなる混合モノマー500gに代える以外は、実施例1と同様にしてインキ組成物を調製した。
【0081】
得られたインキ組成物は粘度13.1cp、表面張力36dyn/cmであり、鮮明さにかけたもので、インキ組成物中の赤色樹脂微粒子の粒子径は0.56μmであった。
【0082】
比較例3
水溶性塩基性染料を使用しない以外は実施例1と同様にして未着色の樹脂微粒子水性分散液を得た。
【0083】
その後、この水性分散液に水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN CATHILON PINK FGH”〕5g、プロピレングリコール1000g、蒸留水3000gを加えて均一に撹拌して赤色インキ組成物を得た。
【0084】
比較例4
水溶性アクリル系樹脂〔ジョンソンポリマー(株)製、“JONCRYL 61J”(固形分30%)〕25g、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN CATHILON PINK FGH”〕2g、プロピレングリコール10g、蒸留水63gを混合し1時間撹拌溶解することにより赤色インキ組成物を得た。
【0085】
比較例5
水溶性青色染料〔保土谷化学工業(株)製“AIZEN VICTORIA PURE BLUE BOH”〕1g、プロピレングリコール10g、蒸留水89gを混合し1時間撹拌溶解することにより青色インキ組成物を得た。
【0086】
得られた結果を表1に示す。
【0087】
【表1】

Figure 0003904674
【0088】
実施例3
2リットルのフラスコに、撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液漏斗を取り付け、温水槽にセットし、蒸留水250gを仕込んで、窒素ガスを導入しながら、内温を60℃まで昇温した。
【0089】
一方、メタクリル酸メチル200g、メタクリロニトリル100g、コハク酸2−メタクリロイルオキシエチル〔三菱レイヨン(株)製、“アクリルエステルSA”〕200gからなる混合モノマー500gに、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN CATHILON RED BLH 200%”〕40gを混合し、さらに蒸留水250gおよび重合性界面活性剤〔旭電化工業(株)製“アデカリアソープSE−10N”〕50gを混合撹拌分散させ、ついで過硫酸アンモニウム3gを溶解させた液を調製した。
【0090】
この調製液を上記分液漏斗から温度60℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し、5時間目で重合を終了し、着色微粒子水性分散液を得た。
【0091】
この着色微粒子水性分散液に、蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度3.2cp、表面張力51dyn/cmの赤色インキ組成物を得た。
【0092】
赤色インキ組成物中の着色樹脂微粒子の粒子径は0.16μmであった。また、赤色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な赤色を呈した。
【0093】
実施例4
2リットルのフラスコに、撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液漏斗を取り付け、温水槽にセットし、蒸留水250gを仕込んで、窒素ガスを導入しながら、内温を50℃まで昇温した。
【0094】
一方、スチレン100g、メタクリル酸メチル200g、メタクリロニトリル100g、メタクリル酸100gからなる混合モノマー500gに、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN PURE BLUE 5GH 200%”〕30g、蒸留水250gおよび重合性界面活性剤〔花王(株)製の“ラテムルS−180”〕40gを撹拌混合して、さらに過硫酸アンモニウム3gを溶解させた液を調製した。
【0095】
この調製液を上記分液漏斗から温度を50℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し、5時間目で重合を終了し、着色微粒子水性分散液を得た。
【0096】
この着色微粒子水性分散液に、蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度3.0cp、表面張力50dyn/cmの青色インキ組成物を得た。
【0097】
青色インキ組成物中の着色樹脂微粒子の粒子径は0.14μmであった。また、青色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な青色を呈した。
【0098】
比較例6
混合モノマー500gを、メタクリル酸メチル300gおよびメタクリロニトリル200gからなる混合モノマー500gに代える以外は、実施例3と同様にしてインキ組成物を調製した。
【0099】
得られたインキ組成物は粘度10.5cp、表面張力37dyn/cmであり、鮮明さにかけたもので、インキ組成物中の赤色樹脂微粒子の粒子径は0.44μmであった。
【0100】
比較例7
水溶性塩基性染料を使用しない以外は実施例3と同様にして未着色の樹脂微粒子水性分散液を得た。
【0101】
その後、この水性分散液に水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN CATHILON PINK FGH”〕5g、プロピレングリコール1000g、蒸留水3000gを加えて均一に撹拌して赤色インキ組成物を得た。
【0102】
得られた結果を表2に示す。
【0103】
【表2】
Figure 0003904674
【0104】
実施例5
2リットルのフラスコに、撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液漏斗を取り付け、温水槽にセットし、蒸留水250gを仕込んで、窒素ガスを導入しながら、内温を60℃まで昇温する。
【0105】
一方、メタクリル酸メチル250g、コハク酸2−メタクリロイルオキシエチル〔三菱レイヨン(株)製、“アクリルエステルSA”〕250gからなる混合モノマー500gに、水溶性塩基性染料〔保土谷化学工業(株)製“AIZENCATHILON RED BLH 200%”〕30gを混合し、さらに蒸留水250gおよび重合性界面活性剤〔旭電化工業(株)製“アデカリアソープSE−10N”〕50gを混合撹拌分散させ、ついで過硫酸アンモニウム3gを溶解させた液を調製した。
【0106】
この調製液を上記分液漏斗から温度60℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し、5時間目で重合を終了し、インキ用着色樹脂微粒子水性分散液を得た。
【0107】
このインキ用着色樹脂微粒子水性分散液に、蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度2.8cp、表面張力52dyn/cmの赤色インキ組成物を得た。
【0108】
赤色インキ組成物中の着色樹脂微粒子の粒子径は0.12μmであった。また、赤色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な赤色を呈した。
【0109】
実施例6
2リットルのフラスコに、撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液漏斗を取り付け、温水槽にセットし、蒸留水250gを仕込んで、窒素ガスを導入しながら、内温を50℃まで昇温する。
【0110】
一方、スチレン200g、メタクリル酸メチル200g、メタクリル酸100gからなる混合モノマー500gに、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN PURE BLUE 5GH 200%”〕25g、蒸留水250gおよび重合性界面活性剤〔花王(株)製の“ラテムルS−180”〕30gを撹拌混合して、さらに過硫酸アンモニウム3gを溶解させた液を調製した。この調製液を上記分液漏斗から温度を50℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し、5時間目で重合を終了し、インキ用着色樹脂微粒子水性分散液を得た。
【0111】
このインキ用着色樹脂微粒子水性分散液に、蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度3.2cp、表面張力49dyn/cmの青色インキ組成物を得た。
【0112】
青色インキ組成物中の着色樹脂微粒子の粒子径は0.15μmであった。また、青色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な青色を呈した。
【0113】
比較例8
水溶性塩基性染料を使用しない以外は実施例5と同様にして未着色の樹脂微粒子水性分散液を得た。
【0114】
その後この水性分散液に、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN CATHILON PINK FGH”〕5gを混合し、さらに蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、赤色インキ組成物を得た。
【0115】
得られた結果を表3に示す。
【0116】
【表3】
Figure 0003904674
【0117】
実施例7
2リットルのフラスコに、撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液漏斗を取り付け、温水槽にセットし、蒸留水250gを仕込んで、窒素ガスを導入しながら、内温を60℃まで昇温する。一方、メタクリル酸メチル150g、メタクリル酸トリフルオロエチル〔三菱レイヨン(株)製、“アクリルエステル3FE”〕150g、コハク酸2−メタクリロイルオキシエチル〔三菱レイヨン(株)製、“アクリルエステルSA”〕200gよりなる混合モノマー500gに、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN CATHILON RED BLH 200%”〕30gを混合し、さらに蒸留水250gおよび重合性界面活性剤〔旭電化工業(株)製“アデカリアソープSE−10N”〕50gを混合撹拌分散させ、ついで過硫酸アンモニウム3gを溶解させた液を調製した。
【0118】
この調製液を上記分液漏斗から温度60℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し、5時間目で重合を終了し、インキ用着色微粒子水性分解液を得た。
【0119】
このインキ用着色微粒子水性分解液に蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度3.0cp、表面張力52dyn/cmの赤色インキ組成物を得た。
【0120】
赤色インキ組成物中の着色樹脂微粒子の粒子径は0.14μmであった。また、赤色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な赤色を呈した。
【0121】
実施例8
2リットルのフラスコに、撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液漏斗を取り付け、温水槽にセットし、蒸留水250gを仕込んで、窒素ガスを導入しながら、内温を50℃まで昇温する。一方、スチレン100g、メタクリル酸メチル200g、メタクリル酸ヘプタデカフルオロデシル100g、メタクリル酸100gからなる混合モノマー500gに、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN PURE BLUE5GH 200%”〕25g、蒸留水250gおよび重合性界面活性剤〔花王(株)製の“ラテムルS−180”〕30gを撹拌混合して、さらに過硫酸アンモニウム3gを溶解させた液を調製した。
【0122】
この調製液を上記分液漏斗から温度を50℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し、5時間目で重合を終了し、インキ用着色微粒子水性分解液を得た。
【0123】
このインキ用着色微粒子水性分解液に蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度2.9cp、表面張力50dyn/cmの青色インキ組成物を得た。
【0124】
青色インキ組成物中の着色樹脂微粒子の粒子径は0.13μmであった。また、青色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な青色を呈した。
【0125】
比較例9
混合モノマー500gを、メタクリル酸メチル300gおよびメタクリル酸トリフルオロエチル(アクリルエステル3FE)200gに代える以外は実施例7と同様にしてインキ組成物を調製した。
【0126】
得られたインキ組成物は粘度10.1cp、表面張力38dyn/cmであり、鮮明さにかけたもので、インキ組成物中の赤色樹脂微粒子の粒子径は0.40μmであった。
【0127】
比較例10
水溶性塩基性染料を使用しない以外は実施例7と同様にして未着色の樹脂微粒子の水性分散液を得た。
【0128】
その後この水性分散液に水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN CATHILON PINK FGH”〕2g、プロピレングリコール10g、蒸留水3000g、プロピレングリコール1000gを加えて均一に撹拌して赤色インキ組成物を得た。
【0129】
得られた結果を表4に示す。
【0130】
【表4】
Figure 0003904674
【0131】
実施例9
2リットルのフラスコに撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液ロートを取り付け、温水槽にセットし、蒸留水500g、重合性界面活性剤「アデカリアソープSE−10N(旭電化工業(株)製)」50g、および過硫酸アンモニウム3gを仕込んで、窒素ガスを導入しながら、80℃まで昇温する。
【0132】
一方、メタクリル酸メチル200g、トリアリルシアヌレート100g、ヘキサヒドロフタル酸2−メタクリロイルオキシエチル〔三菱レイヨン(株)製、アクリルエステルHH、水への溶解度=3.40重量%)200gからなる混合モノマー500gに水溶性塩基性染料「AIZEN CATHILON RED BLH 200%(保土谷化学工業(株)製)」40gを溶解させた液を調製した。
【0133】
この調製液を上記分液ロートから温度80℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し、更に5時間熟成して重合を終了し、インキ用着色樹脂微粒子水性分散液を得た。
【0134】
このインキ用着色樹脂微粒子水性分散液に蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度2.9cp、表面張力50dyn/cmの赤色インキ組成物を得た。
【0135】
赤色インキ組成物中の着色樹脂微粒子の粒子径は0.13μmであった。また、赤色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な赤色を呈した。
【0136】
実施例10
2リットルのフラスコに撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液ロートを取り付け、温水槽にセットし、蒸留水500g、重合性界面活性剤「ラテムルS−180A(花王(株)製)」40g、および過硫酸アンモニウム3gを仕込んで、窒素ガスを導入しながら、内温を60℃まで昇温する。
【0137】
一方、スチレン200g、トリアリルシアヌレート100g、フタル酸2−メタクリロイルオキシエチル(三菱レイヨン(株)製、アクリルエステルPA、水への溶解度=0.08重量%)200gよりなる混合モノマー500gに水溶性塩基性染料「AIZEN PURE BLUE 5GH 200%(保土谷化学工業(株)製)」50gを溶解させた液を調製した。
【0138】
この調製液を上記分液ロートから温度60℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し、更に5時間熟成して重合を終了し、インキ用着色樹脂微粒子水性分散液を得た。
【0139】
このインキ用着色樹脂微粒子水性分散液に蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度3.0cp、表面張力52dyn/cmの青色インキ組成物を得た。
【0140】
青色インキ組成物中の着色樹脂微粒子の粒子径は0.12μmであった。また、青色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な青色を呈した。
【0141】
比較例11
ヘキサヒドロフタル酸2−メタクリロイルオキシエチル200gをメタクリル酸(水への溶解度=∞)200gに代える以外は、実施例9と同様にインキ組成物の調製を行った。しかし、インキ用着色樹脂微粒子水性分散液を調製する途中で、ゲル化が起こり、インキ組成物を得ることができなかった。
【0142】
比較例12
水溶性塩基性染料を使用しない以外は実施例9と同様にして未着色の樹脂微粒子水性分散液を得た。
【0143】
その後、この水性分散液に水溶性塩基性染料「AIZEN CATHILONPINK FGH(保土谷化学工業(株)製)」10g、蒸留水3000g、プロピレングリコール1000gを加えて均一に撹拌して、赤色インキ組成物を得た。
【0144】
得られた結果を表5に示す。
【0145】
【表5】
Figure 0003904674
【0146】
以下に示す実施例、比較例における測定方法は次の方法に従った。なお、粒子径、粘度および表面張力の測定方法は上記と同様に行われた。
【0147】
(鮮明さ)
筆記用紙に筆記した文字の鮮明さを目視により判定した。
○:鮮明である。
△:僅かに濁っている。
×:濁っている。
【0148】
(滲み)
筆記用紙に筆記した文字の滲みの程度を目視により判定した。
○:滲まない。
△:僅かに滲む。
×:滲む。
【0149】
(耐水性)
筆記用紙に筆記した文字を水に1時間浸漬し、滲みの程度を目視により判定した。
○:滲まない。
△:僅かに滲む。
×:滲む。
【0150】
(耐光性)
筆記用紙に筆記した文字をフェードメーター1に照射し、褪色が認められる時間を測定した。
【0151】
(保存安定性)
インキ組成物を水性サインペン容器に充填し、50℃の恒温槽中に入れ、筆記不能となるまでの日数を測定した。
【0152】
実施例11
2リットルのフラスコに、撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液漏斗を取り付け、温水槽にセットし、蒸留水500g、重合性界面活性剤〔旭電化工業(株)製“アデカリアソープSE−10N”〕50gおよび過硫酸アンモニウム3gを仕込んで、窒素ガスを導入しながら、内温を50℃まで昇温した。
【0153】
一方、メタクリル酸メチル200g、トリアリルシアヌレート100g、コハク酸2−メタクリロイルオキシエチル〔三菱レイヨン(株)製、“アクリルエステルSA”〕200gからなる混合モノマー500gに、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN CATHILON RED BLH 200%”〕40gを混合した液を調製した。
【0154】
この調製液を上記分液漏斗から温度50℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し、乳化重合を行った。さらに5時間熟成して重合を終了し、着色微粒子水性分散液を得た。
【0155】
この着色微粒子水性分散液に、蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度2.8cp、表面張力50dyn/cmの赤色インキ組成物を得た。
【0156】
赤色インキ組成物中の着色樹脂微粒子の粒子径は0.14μmであった。また、赤色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な赤色を呈した。
【0157】
実施例12
2リットルのフラスコに、撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液漏斗を取り付け、温水槽にセットし、蒸留水500g、重合性界面活性剤〔花王(株)製の“ラテムルS−180”〕40gおよび過硫酸アンモニウム3gを仕込んで、窒素ガスを導入しながら、内温を50℃まで昇温した。
【0158】
一方、スチレン100g、メタクリル酸メチル200g、トリアリルシアヌレート100g、メタクリル酸100gからなる混合モノマー500gに、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN PURE BLUE 5GH 200%”〕30gを撹拌混合した液を調製した。
【0159】
この調製液を上記分液漏斗から温度を50℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し乳化重合を行った。さらに5時間熟成して重合を終了し、着色微粒子水性分散液を得た。
【0160】
この着色微粒子水性分散液に、蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度3.0cp、表面張力52dyn/cmの青色インキ組成物を得た。
【0161】
青色インキ組成物中の着色樹脂微粒子の粒子径は0.13μmであった。また、青色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な青色を呈した。
【0162】
比較例13
混合モノマー500gを単一のモノマーのメタクリル酸メチル500gに代える以外は、実施例11と同様にインキ組成物を調製した。
【0163】
得られたインキ組成物は粘度9.6cp、表面張力42dyn/cmであり、鮮明さに欠けたものであり、インキ組成物中の着色樹脂微粒子の粒子径は0.34μmであった。
【0164】
比較例14
混合モノマー500gを、メタクリル酸メチル500gおよびトリアリルシアヌレート200gからなる混合モノマー500gに代える以外は、実施例1と同様にしてインキ組成物を調製した。
【0165】
得られたインキ組成物は粘度13.1cp、表面張力36dyn/cmであり、鮮明さにかけたもので、インキ組成物中の赤色樹脂微粒子の粒子径は0.56μmであった。
【0166】
比較例15
水溶性塩基性染料を使用しない以外は実施例11と同様にして未着色の樹脂微粒子水性分散液を得た。
【0167】
その後、この水性分散液に水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN CATHILON PINK FGH”〕5g、プロピレングリコール1000g、蒸留水3000gを加えて均一に撹拌して赤色インキ組成物を得た。
【0168】
比較例16
水溶性アクリル系樹脂〔ジョンソンポリマー(株)製、“JONCRYL 61J”(固形分30%)〕25g、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN CATHILON PINK FGH”〕2g、プロピレングリコール10g、蒸留水63gを混合し1時間撹拌溶解することにより赤色インキ組成物を得た。
【0169】
比較例17
水溶性青色染料〔保土谷化学工業(株)製“AIZEN VICTORIA PURE BLUE BOH”〕1g、プロピレングリコール10g、蒸留水89gを混合し、1時間撹拌溶解することにより青色インキ組成物を得た。
【0170】
得られた結果を表6に示す。
【0171】
【表6】
Figure 0003904674
【0172】
実施例13
2リットルのフラスコに、撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液漏斗を取り付け、温水槽にセットし、蒸留水500g、重合性界面活性剤〔旭電化工業(株)製“アデカリアソープSE−10N”〕50gおよび過硫酸アンモニウム3gを仕込んで、窒素ガスを導入しながら、内温を50℃まで昇温した。
【0173】
一方、メタクリル酸メチル200g、メタクリロニトリル100g、コハク酸2−メタクリロイルオキシエチル〔三菱レイヨン(株)製、“アクリルエステルSA”〕200gからなる混合モノマー500gに、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN CATHILON RED BLH 200%”〕40gを混合した液を調製した。
【0174】
この調製液を上記分液漏斗から温度50℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し、5時間目で重合を終了し、着色微粒子水性分散液を得た。
【0175】
この着色微粒子水性分散液に、蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度3.0cp、表面張力50dyn/cmの赤色インキ組成物を得た。
【0176】
赤色インキ組成物中の着色樹脂微粒子の粒子径は0.14μmであった。また、赤色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な赤色を呈した。
【0177】
実施例14
2リットルのフラスコに、撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液漏斗を取り付け、温水槽にセットし、蒸留水500g、重合性界面活性剤〔花王(株)製の“ラテムルS−180”〕40gおよび過硫酸アンモニウム3gを仕込んで、窒素ガスを導入しながら、内温を50℃まで昇温した。
【0178】
一方、スチレン100g、メタクリル酸メチル200g、メタクリロニトリル100g、メタクリル酸100gからなる混合モノマー500gに、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN PURE BLUE 5GH 200%”〕30gを撹拌混合した液を調製した。
【0179】
この調製液を上記分液漏斗から温度を50℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し、5時間目で重合を終了し、着色微粒子水性分散液を得た。
【0180】
この着色微粒子水性分散液に、蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度2.8cp、表面張力52dyn/cmの青色インキ組成物を得た。
【0181】
青色インキ組成物中の着色樹脂微粒子の粒子径は0.13μmであった。また、青色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な青色を呈した。
【0182】
比較例18
混合モノマー500gを、メタクリル酸メチル300gおよびメタクリロニトリル200gからなる混合モノマー500gに代える以外は、実施例13と同様にしてインキ組成物を調製した。
【0183】
得られたインキ組成物は粘度9.1cp、表面張力38dyn/cmであり、鮮明さにかけたもので、インキ組成物中の赤色樹脂微粒子の粒子径は0.45μmであった。
【0184】
比較例19
水溶性塩基性染料を使用しない以外は実施例13と同様にして未着色の樹脂微粒子水性分散液を得た。
【0185】
その後、この水性分散液に水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN CATHILON PINK FGH”〕5g、プロピレングリコール1000g、蒸留水3000gを加えて均一に撹拌して赤色インキ組成物を得た。
【0186】
得られた結果を表7に示す。
【0187】
【表7】
Figure 0003904674
【0188】
実施例15
2リットルのフラスコに、撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液漏斗を取り付け、温水槽にセットし、蒸留水500g、重合性界面活性剤〔旭電化工業(株)製“アデカリアソープSE−10N”〕50g、および過硫酸アンモニウム3gを仕込んで、窒素ガスを導入しながら、内温を50℃まで昇温する。
【0189】
一方、メタクリル酸メチル250g、コハク酸2−メタクリロイルオキシエチル〔三菱レイヨン(株)製“アクリルエステルSA”〕250gからなる混合モノマー500gに、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN CATHILON RED BLH 200%”〕40gを混合した液を調製した。
【0190】
この調製液を上記分液漏斗から温度50℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し、5時間目で重合を終了し、着色樹脂微粒子水性分散液を得た。
【0191】
この樹脂微粒子水性分散液に、蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度2.9cp、表面張力52dyn/cmの筆記具用赤色インキ組成物を得た。
【0192】
この赤色インキ組成物中の着色樹脂微粒子の粒子径は0.13μmであった。また、赤色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な赤色を呈した。
【0193】
実施例16
2リットルのフラスコに、撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液漏斗を取り付け、温水槽にセットし、蒸留水500g、重合性界面活性剤〔花王(株)製“ラテムルS−180”〕40g、および過硫酸アンモニウム3gを仕込んで、窒素ガスを導入しながら、内温を50℃まで昇温する。
【0194】
一方、スチレン200g、メタクリル酸メチル200g、メタクリル酸100gからなる混合モノマー500gに、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN PURE BLUE 5GH 200%”〕30gを混合した液を調製した。
【0195】
この調製液を上記分液漏斗から温度を50℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し、5時間目で重合を終了し、着色樹脂微粒子水性分散液を得た。
【0196】
この樹脂微粒子水性分散液に、蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度3.0cp、表面張力50dyn/cmの筆記具用青色インキ組成物を得た。
【0197】
この青色インキ組成物中の着色樹脂微粒子の粒子径は0.14μmであった。また、青色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な青色を呈した。
【0198】
比較例20
水溶性塩基性染料を使用しない以外は実施例15と同様にして未着色の樹脂微粒子の水性分散液を得た。
【0199】
その後この水性分散液に、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN CATHILON PINK FGH”〕5gを混合し、さらに蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、赤色インキ組成物を得た。
【0200】
得られた結果を表8に示す。
【0201】
【表8】
Figure 0003904674
【0202】
実施例17
2リットルのフラスコに、撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液漏斗を取り付け、温水槽にセットし、蒸留水500g、重合性界面活性剤〔旭電化工業(株)製“アデカリアソープSE−10N”〕50g、および過硫酸アンモニウム3gを仕込んで、窒素ガスを導入しながら、内温を50℃まで昇温する。
【0203】
一方、メタクリル酸メチル150g、メタクリル酸トリフルオロエチル〔三菱レイヨン(株)製“アクリルエステル3FE”〕150g、コハク酸2−メタクリロイルオキシエチル〔三菱レイヨン(株)製“アクリルエステルSA”〕200gかならる混合モノマー500gに、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN CATHILON RED BLH 200%”〕40gを混合した液を調製した。
【0204】
この調製液を上記分液漏斗から温度50℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し、5時間目で重合を終了し、着色樹脂微粒子水性分散液を得た。
【0205】
この樹脂微粒子水性分散液に、蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度2.9cp、表面張力52dyn/cmの筆記具用赤色インキ組成物を得た。
【0206】
この赤色インキ組成物中の着色樹脂微粒子の粒子径は0.13μmであった。また、赤色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な赤色を呈した。
【0207】
実施例18
2リットルのフラスコに、撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液漏斗を取り付け、温水槽にセットし、蒸留水500g、重合性界面活性剤〔花王(株)製“ラテムルS−180”〕40g、および過硫酸アンモニウム3gを仕込んで、窒素ガスを導入しながら、内温を50℃まで昇温する。
【0208】
一方、スチレン100g、メタクリル酸メチル200g、メタクリル酸ヘプタデカフルオロデシル100g、メタクリル酸100gからなる混合モノマー500gに、水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN PURE BLUE 5GH 200%”〕30gを混合した液を調製した。
【0209】
この調製液を上記分液漏斗から温度を50℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し、5時間目で重合を終了し、着色樹脂微粒子水性分散液を得た。
【0210】
この樹脂微粒子水性分散液に、蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度3.0cp、表面張力50dyn/cmの筆記具用青色インキ組成物を得た。
【0211】
この青色インキ組成物中の着色樹脂微粒子の粒子径は0.12μmであった。また、青色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な青色を呈した。
【0212】
比較例21
混合モノマー500gを、メタクリル酸メチル300gおよびメタクリル酸トリフルオロエチル(アクリルエステル3FE)200gに代える以外は実施例17と同様にしてインキ組成物を調製した。
【0213】
得られたインキ組成物は粘度10.1cp、表面張力38dyn/cmであり、鮮明さにかけたもので、インキ組成物中の赤色樹脂微粒子の粒子径は0.40μmであった。
【0214】
比較例22
水溶性塩基性染料を使用しない以外は実施例17と同様にして未着色の樹脂微粒子の水性分散液を得た。
【0215】
その後この水性分散液に水溶性塩基性染料〔保土谷化学工業(株)製“AIZEN CATHILON PINK FGH”〕5g、蒸留水3000g、プロピレングリコール1000gを加えて均一に撹拌して赤色インキ組成物を得た。
【0216】
得られた結果を表9に示す。
【0217】
【表9】
Figure 0003904674
【0218】
実施例19
2リットルのフラスコに撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液ロートを取り付け、温水槽にセットし、蒸留水500g、重合性界面活性剤「アデカリアソープSE−10N(旭電化工業(株)製)」50g、および過硫酸アンモニウム3gを仕込んで、窒素ガスを導入しながら、80℃まで昇温する。
【0219】
一方、メタクリル酸メチル200g、トリアリルシアヌレート100g、ヘキサヒドロフタル酸2−メタクリロイルオキシエチル(三菱レイヨン(株)製、アクリルエステルHH、水への溶解度=3.40重量%)200gよりなる混合モノマー500gに水溶性塩基性染料「AIZEN CATHILON RED BLH 200%(保土谷化学工業(株)製)」40gを溶解させた液を調製した。
【0220】
この調製液を上記分液ロートから温度80℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し、更に5時間熟成して重合を終了し、インキ用着色樹脂微粒子水性分散液を得た。
【0221】
このインキ用着色樹脂微粒子水性分散液に蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度2.9cp、表面張力50dyn/cmの赤色インキ組成物を得た。
【0222】
赤色インキ組成物中の着色樹脂微粒子の粒子径は0.13μmであった。また、赤色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な赤色を呈した。
【0223】
実施例20
2リットルのフラスコに撹拌機、還流冷却器、温度計、窒素ガス導入管、モノマー投入用1000ml分液ロートを取り付け、温水槽にセットし、蒸留水500g、重合性界面活性剤「ラテムルS−180A(花王(株)製)」40g、および過硫酸アンモニウム3gを仕込んで、窒素ガスを導入しながら、内温を60℃まで昇温する。
【0224】
一方、スチレン200g、トリアリルシアヌレート100g、フタル酸2−メタクリロイルオキシエチル(三菱レイヨン(株)製、アクリルエステルPA、水への溶解度=0.08重量%)200gよりなる混合モノマー500gに水溶性塩基性染料「AIZEN PURE BLUE 5GH 200%(保土谷化学工業(株)製)」50gを溶解させた液を調製した。
【0225】
この調製液を上記分液ロートから温度60℃付近に保ったフラスコ内に撹拌下で3時間にわたって添加し、更に5時間熟成して重合を終了し、インキ用着色樹脂微粒子水性分散液を得た。
【0226】
このインキ用着色樹脂微粒子水性分散液に蒸留水3000g、プロピレングリコール1000gを加えて、均一に撹拌して、粘度3.0cp、表面張力52dyn/cmの青色インキ組成物を得た。
【0227】
青色インキ組成物中の着色樹脂微粒子の粒子径は0.12μmであった。また、青色インキ組成物は、耐水性、耐光性に優れた特性を有し、滲み、目詰まりのない鮮明な青色を呈した。
【0228】
比較例23
ヘキサヒドロフタル酸2−メタクリロイルオキシエチル200gをメタクリル酸(水への溶解度=∞)200gに代える以外は、実施例19と同様にインキ組成物の調製を行った。しかし、インキ用着色樹脂微粒子水性分散液を調製する途中で、ゲル化が起こり、インキ組成物を得ることができなかった。
【0229】
比較例24
水溶性塩基性染料を使用しない以外は実施例19と同様にして未着色の樹脂微粒子水性分散液を得た。
【0230】
その後、この水性分散液に水溶性塩基性染料「AIZEN CATHILONPINK FGH(保土谷化学工業(株)製)」10g、蒸留水3000g、プロピレングリコール1000gを加えて均一に撹拌して、赤色インキ組成物を得た。
【0231】
得られた結果を表10に示す。
【0232】
【表10】
Figure 0003904674
【0233】
【発明の効果】
本発明の水性インキ用着色樹脂微粒子水性分散液は、予め水溶性塩基性染料が溶解されたビニルモノマーを乳化重合して調製された着色樹脂微粒子を含有しているので、鮮やかな色を呈し、長期の間に樹脂微粒子が凝集したり沈降したりしない。
【0234】
本発明の筆記具用インキ組成物は、水や汗によって滲んだり消失することもなく、混色によって色が濁ったりすることもない、鮮明で、滲まない筆記文字または描線を与える。また、文字、描線を長期間放置しても変質しない耐水性や耐光性に優れたものである。
【0235】
本発明のインキジェット記録装置用水性インキ組成物は安定性に優れている。また、このインキ組成物を用いたインキジェット記録は、印刷部が滲まず、鮮明な画像を与え、耐水性や耐光性に優れている。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an aqueous dispersion of colored resin fine particles for water-based ink, which is a base of ink, and a water-based ink composition which is free from bleeding during writing and is useful for writing instruments such as sign pens and ballpoint pens or ink jet recording apparatuses.
[0002]
[Prior art]
Dyes and pigments are known as coloring components of water-based inks used for writing instruments such as water-based sign pens and water-based ballpoint pens.
[0003]
An ink using a dye has a defect that the written character / drawing line becomes unclear because the dye / water is soluble in the dye / sweat, and the so-called water resistance is poor. In addition, since the dye itself is inferior in light resistance, there is a problem that characters and drawn lines are deteriorated over a long period of time.
[0004]
On the other hand, inks using pigments have no problem with respect to water resistance or light resistance, but the pigments aggregate or settle over a long period of time, causing problems such as clogging of the pen tip and poor writing. In addition, since the ink for writing instruments is required to be finely dispersed in the pigment, it is difficult to increase the number of ink colors by dispersing various colored pigments.
[0005]
As an ink composition for a conventional ink jet recording apparatus, an ink composition obtained by dissolving a water-soluble acidic dye or basic dye in an aqueous medium and adding additives such as a wetting agent, a pH adjusting agent, and a preservative. Things are known.
[0006]
[Problems to be solved by the invention]
However, in these ink compositions, the printed portion is blurred and the image becomes unclear, the recorded image is blurred or disappeared due to sweat or water, and the color becomes cloudy due to color mixing. There is a drawback. Originally, water-soluble dyes are inferior in light resistance, and there is a problem that an image is deteriorated when a printed matter is stored for a long period of time. In addition, these ink compositions change the physical properties of the ink or cause precipitation due to long-term storage or repeated printing, etc., causing clogging of the nozzles and significant ink ejection, resulting in poor printing. There is a drawback.
[0007]
The present invention has been made in order to solve the above-mentioned drawbacks and problems. An aqueous dispersion of colored resin fine particles for water-based inks having a sufficient concentration as a base for a stable ink composition free from precipitation. The purpose is to provide.
[0008]
Another object of the present invention is to provide a water-based ink composition for a writing instrument that is clear, does not bleed or disappear due to water or sweat, does not deteriorate for a long time, and has excellent light resistance and line drawing. It is.
[0009]
A further object of the present invention is to provide a clear image in which the recorded image does not blur or disappear due to water or sweat, and the printed portion does not blur, and the image is altered even if the printed matter is stored for a long period of time. It is an object to provide an ink composition for an ink jet recording apparatus which has excellent light resistance and does not become cloudy due to color mixing.
[0010]
[Means for Solving the Problems]
The aqueous dispersion of colored resin fine particles for water-based ink according to the present invention contains 5 to 90% by weight of a carboxyl group-containing vinyl monomer having a solubility in water of 10% by weight or less as an acidic functional group, as well as a cyano group, triazine ring and fluorine. Containing a vinyl monomer having at least one substituent among the groups and a hydrophobic vinyl monomer in the balance, dissolving 0.2 to 50% by weight of a water-soluble basic dye based on the total amount of the monomers; The mixed vinyl monomer is prepared by emulsion polymerization in the presence of 0.1 to 50% by weight of a polymerizable surfactant.
[0014]
The water-based ink composition of the present invention contains the above-described aqueous dispersion of colored resin fine particles for water-based ink, a water-soluble organic solvent, and water. Preferably, the content of the aqueous dispersion of colored resin fine particles for water-based ink is 3 to 30% by weight (in terms of resin solid content) and the content of the water-soluble organic solvent is 5 to 80% with respect to the total amount of the ink composition. %, And the water content is 30 to 90% by weight.
[0015]
The water-based ink composition for a writing instrument of the present invention contains the above-described aqueous dispersion of colored resin fine particles for water-based ink, a water-soluble organic solvent, and water. Preferably, the content of the aqueous dispersion of colored resin fine particles for water-based ink is 3 to 30% by weight (in terms of resin solid content) and the content of the water-soluble organic solvent is 5 to 80% with respect to the total amount of the ink composition. %, And the water content is 30 to 90% by weight.
[0016]
The water-based ink composition for an ink jet recording apparatus of the present invention contains the above-described aqueous dispersion of colored resin fine particles for water-based ink, a water-soluble organic solvent, and water. Preferably, the content of the aqueous dispersion of colored resin fine particles for water-based ink is 3 to 30% by weight (in terms of resin solid content) and the content of the water-soluble organic solvent is 5 to 80% with respect to the total amount of the ink composition. %, And the water content is 30 to 90% by weight.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
The aqueous dispersion of colored resin fine particles for water-based ink according to the present invention comprises a mixed vinyl monomer containing a vinyl monomer having an acidic group in which a water-soluble basic dye is dissolved, a polymerization initiator such as ammonium persulfate, potassium persulfate, and hydrogen peroxide. Or, if necessary, by using a reducing agent in combination as an initiator and preparing by emulsion copolymerization using a polymerizable surfactant. The colored resin fine particle aqueous dispersion for water-based ink obtained as described above is usually obtained as a concentrated liquid having a resin solid content of 20 to 50% by weight.
[0018]
A water-based ink composition of the present invention is obtained by diluting the aqueous dispersion of colored resin fine particles for water-based ink obtained with this concentrated liquid with water and a water-soluble organic solvent to a resin solid content of 3 to 30% by weight. It is done.
[0019]
The vinyl monomer having an acidic functional group used for the preparation of the colored resin fine particle aqueous dispersion according to the present invention is not particularly limited as long as it is a vinyl monomer having an acidic functional group such as a carboxyl group or a sulfone group. For example, acrylic acid, Methacrylic acid, succinic acid 2-methacryloyloxyethyl [manufactured by Mitsubishi Rayon Co., Ltd., “acrylic ester SA”], 2-methacryloyloxyethyl phthalate [manufactured by Mitsubishi Rayon Co., Ltd., “acrylic ester PA”], hexahydrophthal Acid 2-methacryloyloxyethyl [manufactured by Mitsubishi Rayon Co., Ltd., “acrylic ester HH”], p-styrene sulfonic acid, 2-sulfoethyl methacrylate [manufactured by Mitsubishi Rayon Co., Ltd., “acrylic ester SEM”] and the like. .
[0020]
Also, hydrophilic monomers alone such as vinyl monomers having an acidic functional group often cannot undergo emulsion polymerization, and it is preferable to carry out emulsion polymerization by mixing hydrophobic vinyl monomers.
[0021]
The hydrophobic vinyl monomer is not particularly limited, and examples thereof include acrylic esters such as methyl acrylate, ethyl acrylate, n-propyl acrylate, and n-butyl acrylate, methyl methacrylate, and ethyl methacrylate. Methacrylic acid esters such as n-propyl methacrylate and n-butyl methacrylate, and styrenes such as styrene and methylstyrene. In the emulsion polymerization, a monomer having a reactive crosslinking group such as an epoxide group, a hydroxymethylamide group or an isocyanate group or a polyfunctional monomer having two or more vinyl groups may be mixed and crosslinked.
[0022]
Due to the presence of the vinyl monomer having an acidic functional group, the mixing of the water-soluble basic dye into the mixed vinyl monomer becomes very good, and as a result, colored resin fine particles having a deep color can be obtained.
[0023]
The blending amount of the vinyl monomer having an acidic functional group in the emulsion copolymerization is preferably 5 to 95% by weight based on the total amount of the vinyl monomer, and if it is too small, the water-soluble basic dye is not sufficiently mixed with the vinyl monomer, and the resin The coloring of the fine particles becomes insufficient, and if it is too much, the emulsion copolymerization is hindered.
[0024]
Typical examples of the vinyl monomer having a cyano group used for the production of the colored resin fine particle aqueous dispersion according to the present invention include acrylonitrile and methacrylonitrile. By copolymerizing a vinyl monomer having a cyano group, the resulting colored resin fine particles will exhibit a more vivid color, and will give sufficient density and clarity as ink for writing instruments and for ink jet recording. In addition, the light resistance is further improved.
[0025]
The blending amount of the vinyl monomer having a cyano group in the emulsion copolymerization is preferably 5 to 80% by weight based on the total amount of the vinyl monomer, and if it is too small, the coloring property and concentration of the colored resin fine particles, light resistance, etc. are not improved. On the other hand, if it is too much, emulsion copolymerization will be hindered.
[0026]
In the emulsion copolymerization according to the present invention, in addition to the vinyl monomer having an acidic functional group and the vinyl monomer having a cyano group, another hydrophobic vinyl monomer may be mixed to carry out the emulsion copolymerization as a mixed vinyl monomer.
[0027]
The hydrophobic vinyl monomer is not particularly limited, and examples thereof include acrylic acid esters such as methyl acrylate, ethyl acrylate, n-propyl acrylate, and n-butyl acrylate, methyl methacrylate, ethyl methacrylate, Examples thereof include methacrylic acid esters such as n-propyl methacrylate and n-butyl methacrylate, and styrenes such as styrene and methylstyrene.
[0028]
In the emulsion copolymerization, a monomer having a reactive crosslinking group such as an epoxy group, a hydroxymethylamide group or an isocyanate group, or a polyfunctional monomer having two or more vinyl groups may be mixed and crosslinked.
[0029]
A typical example of the triazine ring-containing vinyl monomer used in the preparation of the colored resin fine particle aqueous dispersion according to the present invention is triallyl cyanurate. By copolymerizing the triazine ring-containing vinyl monomer, the resulting colored resin fine particles come to exhibit a more vivid color, and as a writing instrument ink and to give sufficient density and clarity for ink jet recording, Further, the light resistance is further improved. The blending amount of the triazine ring-containing vinyl monomer in the emulsion copolymerization is preferably 3 to 80% by weight based on the total amount of the vinyl monomer, and if it is too small, the coloring property and concentration of the colored resin fine particles, light resistance, etc. are not improved. If it is too much, the emulsion copolymerization will be hindered.
[0030]
In the emulsion copolymerization according to the present invention, in addition to the vinyl monomer having an acidic functional group and the triazine ring-containing vinyl monomer, other hydrophobic vinyl monomers may be mixed to carry out emulsion copolymerization as a mixed vinyl monomer.
[0031]
The hydrophobic vinyl monomer is not particularly limited, and examples thereof include acrylic acid esters such as methyl acrylate, ethyl acrylate, n-propyl acrylate, and n-butyl acrylate, methyl methacrylate, ethyl methacrylate, Examples thereof include methacrylic acid esters such as n-propyl methacrylate and n-butyl methacrylate, and styrenes such as styrene and methylstyrene.
[0032]
In the emulsion copolymerization, a monomer having a reactive crosslinking group such as an epoxy group, a hydroxymethylamide group or an isocyanate group, or a polyfunctional monomer having two or more vinyl groups may be mixed and crosslinked.
[0033]
The vinylomer having a fluorine group used for the production of the colored resin fine particle aqueous dispersion according to the present invention is not particularly limited. For example, trifluoroethyl methacrylate [manufactured by Mitsubishi Rayon Co., Ltd., “acrylic ester 3FE”], Examples thereof include heptadecafluorodecyl methacrylate [manufactured by Mitsubishi Rayon Co., Ltd., “acrylic ester 17FE”].
[0034]
By copolymerizing a vinyl monomer having a fluorine group, the resulting colored fine particles exhibit a more vivid color, provide sufficient concentration and clarity as ink for writing instruments and ink jet recording, and also have light resistance. It will be excellent.
[0035]
In the emulsion copolymerization according to the present invention, in addition to a vinyl monomer having an acidic functional group and a vinyl monomer having a fluorine group, other hydrophobic vinyl monomers may be mixed to carry out emulsion copolymerization as a mixed vinyl monomer.
[0036]
The hydrophobic vinyl monomer is not particularly limited, and examples thereof include acrylic esters such as methyl acrylate, ethyl acrylate, propyl acrylate, and n-butyl acrylate, methyl methacrylate, ethyl methacrylate, and methacrylic acid. Examples thereof include methacrylic acid esters such as n-propyl and n-butyl methacrylate, and styrenes such as styrene and methylstyrene.
[0037]
In the emulsion polymerization, a monomer having a reactive crosslinking group such as an epoxide group, a hydroxymethylamide group or an isocyanate group or a polyfunctional monomer having two or more vinyl groups may be mixed and crosslinked.
[0038]
The blending amount of the vinyl monomer having a fluorine group is preferably 5 to 80% by weight based on the total amount of the vinyl monomer. If the blending amount is too small, the color developability, concentration, light resistance and the like of the colored resin fine particles are not improved.
[0039]
Another colored resin fine particle aqueous dispersion of the present invention is prepared by dissolving a water-soluble basic dye in a mixed vinyl monomer containing 5 to 90% by weight of a carboxyl group-containing vinyl monomer having a solubility in water of 10% by weight or less. , Potassium persulfate, hydrogen peroxide or the like as a polymerization initiator, or, if necessary, an initiator in combination with a reducing agent, and by emulsion polymerization using a polymerizable surfactant, the resin solid content 20 Obtained as a concentrated solution of ˜50% by weight. In order to make this into an ink composition, it is obtained by diluting with water and a water-soluble organic solvent and adjusting the resin solid content to 3 to 30% by weight in the ink composition.
[0040]
The carboxyl group-containing vinyl monomer used for the preparation of another colored resin fine particle aqueous dispersion according to the present invention is a vinyl monomer having a solubility in water of 10% by weight or less. For example, 2-methacryloyloxyethyl succinate (Mitsubishi Manufactured by Rayon Co., Ltd., acrylic ester SA, solubility in water = 1.86 wt%, 2-methacryloyloxyethyl maleate (produced by Mitsubishi Rayon Co., Ltd., acrylic ester ML, solubility in water = 9.17 wt. %), 2-methacryloyloxyethyl phthalate (manufactured by Mitsubishi Rayon Co., Ltd., acrylic ester PA, solubility in water = 0.08 wt%), 2-methacryloyloxyethyl hexahydrophthalate (Mitsubishi Rayon Co., Ltd.) ), Acrylic ester HH, solubility in water = 3.40% by weight) and the like.
[0041]
When a carboxyl group-containing vinyl monomer having a low solubility in water can be used, the proportion of acidic monomers in the mixed vinyl monomer can be increased. Therefore, the amount of water-soluble basic dye that can be mixed with the vinyl monomer becomes very large. As a result, colored resin fine particles having a deep color can be obtained. As for the compounding quantity of a carboxyl group-containing vinyl monomer, 5-90 weight% is preferable with respect to mixed vinyl monomer whole quantity. If the amount is too small, the amount of the water-soluble basic dye that can be mixed with the vinyl monomer is small, and the resin fine particles are not sufficiently colored. If the amount is too large, the emulsion copolymerization is hindered.
[0042]
In the emulsion copolymerization according to the present invention, in addition to the carboxyl group-containing vinyl monomer, another hydrophobic vinyl monomer may be mixed to carry out the emulsion copolymerization as a mixed vinyl monomer.
[0043]
The hydrophobic vinyl monomer is not particularly limited, and examples thereof include acrylic acid esters such as methyl acrylate, ethyl acrylate, n-propyl acrylate, and n-butyl acrylate, methyl methacrylate, ethyl methacrylate, Examples thereof include methacrylic acid esters such as methacrylic n-propyl and n-butyl methacrylate, and styrenes such as styrene and methylstyrene.
[0044]
In the emulsion copolymerization, a monomer having a reactive crosslinking group such as an epoxy group, a hydroxymethylamide group or an isocyanate group, or a polyfunctional monomer having two or more vinyl groups may be blended and crosslinked.
[0045]
The water-soluble basic dye used for the preparation of the colored resin fine particle aqueous dispersion according to the present invention is not particularly limited. For example, “AIZEN CATHILON YELLOW 7GLH” (CI BASIC YELLOW 21) manufactured by Hodogaya Chemical Industries, Ltd. “BASCRYL GOLDEN YELLOW X-GFL” manufactured by BASF (CI BASIC YELLOW 28) “AIZEN CATILON RED BLH 200%” manufactured by Hodogaya Chemical Co., Ltd. (“CI BASIC RED 39”) "BASACRYL BRILLIANT RED G" (CI BASIC RED 52) "" AIZEN CATILON PURE BLUE 5GH 200% "(CI BASIC BLUE 3) manufactured by Hodogaya Chemical Co., Ltd. ASACRYL BLUE X-3GL "(CI BASIC BLUE 41)", and the like. The blending amount of the dye at the time of emulsion copolymerization is in the range of 0.2 to 50% by weight with respect to the total amount of monomers.
[0046]
In the emulsion copolymerization according to the present invention, a surfactant is usually used. The surfactant is not particularly limited, but a polymerizable surfactant is preferred.
[0047]
Examples of the polymerizable surfactant include anionic and nonionic surfactants such as “Adekaria Soap NE-10”, “Same NE-20”, “Same NE-30”, “Asahi Denka Kogyo Co., Ltd.” "NE-40", "SE-10N", "Latemul S-180", "S-180A", "S-120A" manufactured by Kao Corporation, "Eleminol" manufactured by Sanyo Chemical Industries JS-2 "and the like can be used, and one or more of them can be used in combination. The amount of the surfactant used is desirably 0.1 to 50% by weight based on the vinyl monomer.
[0048]
The aqueous dispersion of colored resin fine particles according to the present invention has a high surface tension because there is almost no surface-active substance in the aqueous medium as compared with that obtained using a conventional surfactant (ordinary) , 40 dyn / cm or more). Therefore, when used in an ink composition for an ink jet recording apparatus, it is possible to obtain a clear image in which a printed portion does not blur. Further, it is possible to obtain a water-resistant film in which an image is not blotted or disappeared by water or sweat. In addition, when used as a writing instrument ink, the characters and the drawn lines are clear and do not bleed or disappear due to water or sweat, resulting in a water-resistant drawn film.
[0049]
As described above, the ink composition of the present invention can be obtained by diluting a concentrated liquid of colored resin fine particle aqueous dispersion with an aqueous organic solvent and water.
[0050]
Examples of the water-soluble organic solvent used in the ink composition of the present invention include ethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, 1,2-propanediol, 1,3-propanediol, and 1,2-butanediol. 2,3-butanediol, 1,3-butanediol, 1,4-butanediol, 1,2-pentanediol, 1,5-pentanediol, 2,5-hexanediol, 3-methyl-1,3- Alkylene glycols such as butanediol, 2methylpentane-2,4-diol, 3-methylpentane-1,3,5triol, 1,2,3-hexanetriol, glycerin, and polyalkylenes such as polyethylene glycol and polypropylene glycol Glycols, glycerol, diglycerol Glycerols such as triglycerol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, lower alkyl ethers of glycols such as diethylene glycol mono-n-butyl ether, thiodiethanol, N-methyl-2- Examples include pyrrolidone and 1,3-dimethyl-2-imidazolidinone. The content is preferably 5 to 80% by weight, more preferably 10 to 60% by weight, based on the total amount of the ink composition.
[0051]
In addition, for example, alcohols such as methyl alcohol, ethyl alcohol, isopropyl alcohol, n-butyl alcohol, tert-butyl alcohol, isobutyl alcohol, hexyl alcohol, octyl alcohol, nonyl alcohol, decyl alcohol, benzyl alcohol, dimethylformamide, diethyl Amides such as acetamide, ketones such as acetone, water-soluble solvents such as N-methylpyrrolidone and 1,3-dimethyl-2-imidazolidinone can also be mixed.
[0052]
The water content is preferably 30 to 90% by weight, more preferably 40 to 60% by weight, based on the total amount of the ink composition.
[0053]
In addition, preservatives, pH adjusters, antifoaming agents, and the like can be appropriately selected and used as necessary.
[0054]
For example, pH adjusters include ammonia, urea, monoethanolamine, diethanolamine, triethanolamine, sodium tripolynate, sodium carbonate and other alkali metal salts of carbonic acid and phosphoric acid, and alkali metal hydroxides such as sodium hydroxide. can give.
[0055]
As preservatives or antifungal agents, phenol, sodium omadin, sodium pentachlorophenol, 1,2-benzisothiazoline 3-one, 2,3,5,6-tetrachloro-4 (methylphonyl) pyridine, benzoic acid and sorbine Examples thereof include alkali metal salts of acids and dehydroacetic acid, and benzimidazole compounds.
[0056]
Polyalkylene glycol derivatives such as polyoxyethylene lauryl ether, fatty acid alkali salts, nonionic surfactants, fluorine-based surfactants such as perfluoroalkyl phosphate esters, and polyethylene glycol adducts of dimethylpolysiloxane as lubricants Examples include ether-modified silicone.
[0057]
The colored resin fine particle aqueous dispersion for ink of the present invention usually does not aggregate or precipitate. When this colored resin fine particle aqueous dispersion is used in an ink composition for an ink jet recording apparatus, the particle diameter of the colored resin fine particle for ink is 1.0 μm or less, so that the ink composition passes through a fine nozzle. High stability is obtained without clogging. On the other hand, when this colored resin fine particle aqueous dispersion for ink is used in an ink composition for writing instruments, clogging does not occur when passing through a thin pen tip such as a felt pen.
[0058]
Furthermore, when the aqueous dispersion of colored resin fine particles for water-based ink of the present invention is used in an ink composition for an ink jet recording apparatus, a clear image can be obtained without the printing part becoming cloudy due to color mixing. The image does not blur or disappear due to water or sweat. In addition, it is possible to provide a print or printed matter with excellent light resistance that does not change the image even when stored for a long period of time. On the other hand, when the aqueous dispersion of colored resin fine particles for water-based ink of the present invention is used in an ink composition for writing instruments, it does not blur or disappear due to water or sweat, and the color does not become cloudy due to color mixing. Gives a non-bleeded writing or stroke. In addition, it is excellent in water resistance and light resistance that does not change even if letters and drawn lines are left for a long period of time.
[0059]
【Example】
Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.
The performance test in each example followed the following method.
[0060]
(Clarity)
The clearness of the characters printed on the PPC copy paper was visually determined.
○: Clear.
Δ: Slightly cloudy.
X: It is cloudy.
[0061]
(Bleed)
The degree of bleeding of characters printed on the PPC copy paper was judged visually.
○: No bleeding.
Δ: Slightly blots.
×: bleeding.
[0062]
(water resistant)
The characters printed on the PPC copy paper were immersed in water for 1 hour, and the degree of bleeding was judged visually.
○: No bleeding.
Δ: Slightly blots.
×: bleeding.
[0063]
(Light resistance)
The characters printed on the PPC copy paper were irradiated on the fade meter, and the time when the fading was recognized was measured.
[0064]
(Storage stability)
The cartridge filled with the ink composition was placed in a constant temperature bath at 50 ° C., and the number of days until printing became impossible was measured.
[0065]
(Particle size)
The particle diameter of the colored resin fine particles in the ink composition was measured using a laser scattering type particle size distribution analyzer (manufactured by Nikkiso Co., Ltd., Coulter Counter, Model N4SD).
[0066]
(viscosity)
The viscosity of the ink composition was measured using a cone plate type rotational viscometer [Tokyo Keiki Co., Ltd., ELD type]. The measurement temperature was 25 ° C.
[0067]
(surface tension)
The surface tension of the ink composition was measured by a hanging plate method. The measurement temperature was 25 ° C.
[0068]
Example 1
A 2 liter flask was equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer addition, set in a hot water tank, 500 g of distilled water, polymerizable surfactant [Asahi Denka Kogyo Co., Ltd. 50 g of “ADEKA rear soap SE-10N” manufactured by KK and 3 g of ammonium persulfate were charged, and the internal temperature was raised to 50 ° C. while introducing nitrogen gas.
[0069]
On the other hand, to 500 g of a mixed monomer consisting of 200 g of methyl methacrylate, 100 g of triallyl cyanurate, 2-methacryloyloxyethyl succinate (“Mitsubishi Rayon Co., Ltd.,“ acrylic ester SA ”), water-soluble basic dye [Hodogaya A liquid in which 40 g of “AIZEN CATILON RED BLH 200%” manufactured by Chemical Industry Co., Ltd. was mixed was prepared.
[0070]
This preparation solution was added from the above separatory funnel to a flask maintained at a temperature of about 50 ° C. over 3 hours with stirring to carry out emulsion polymerization. Further, aging was performed for 5 hours to complete the polymerization, and a colored fine particle aqueous dispersion was obtained.
[0071]
To this colored fine particle aqueous dispersion, 3000 g of distilled water and 1000 g of propylene glycol were added and stirred uniformly to obtain a red ink composition having a viscosity of 2.8 cp and a surface tension of 50 dyn / cm.
[0072]
The particle diameter of the colored resin fine particles in the red ink composition was 0.14 μm. The red ink composition had excellent water resistance and light resistance, and exhibited a clear red color without bleeding and clogging.
[0073]
Example 2
A 2 liter flask was equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer introduction, set in a warm water tank, 500 g of distilled water, a polymerizable surfactant [Kao Corporation ) “Latemul S-180”] and 40 g of ammonium persulfate were charged, and the internal temperature was raised to 50 ° C. while introducing nitrogen gas.
[0074]
On the other hand, to 500 g of a mixed monomer composed of 100 g of styrene, 200 g of methyl methacrylate, 100 g of triallyl cyanurate, and 100 g of methacrylic acid, 30 g of water-soluble basic dye [“AIZEN PURE BLUE 5GH 200%” manufactured by Hodogaya Chemical Co., Ltd.] Was mixed with stirring.
[0075]
This preparation was added from the above separatory funnel to a flask maintained at a temperature of about 50 ° C. over 3 hours with stirring to carry out emulsion polymerization. Further, aging was performed for 5 hours to complete the polymerization, and a colored fine particle aqueous dispersion was obtained.
[0076]
To this colored fine particle aqueous dispersion, 3000 g of distilled water and 1000 g of propylene glycol were added and stirred uniformly to obtain a blue ink composition having a viscosity of 3.0 cp and a surface tension of 52 dyn / cm.
[0077]
The particle diameter of the colored resin fine particles in the blue ink composition was 0.13 μm. The blue ink composition had excellent water resistance and light resistance, and exhibited a clear red color without bleeding and clogging.
[0078]
Comparative Example 1
An ink composition was prepared in the same manner as in Example 1 except that 500 g of the mixed monomer was replaced with 500 g of the single monomer methyl methacrylate.
[0079]
The obtained ink composition had a viscosity of 9.6 cp and a surface tension of 42 dyn / cm, and lacked clarity. The particle diameter of the colored resin fine particles in the ink composition was 0.34 μm.
[0080]
Comparative Example 2
An ink composition was prepared in the same manner as in Example 1 except that 500 g of the mixed monomer was replaced with 500 g of the mixed monomer composed of 300 g of methyl methacrylate and 200 g of triallyl cyanurate.
[0081]
The obtained ink composition had a viscosity of 13.1 cp and a surface tension of 36 dyn / cm, and was subjected to sharpness. The particle diameter of the red resin fine particles in the ink composition was 0.56 μm.
[0082]
Comparative Example 3
An uncolored resin fine particle aqueous dispersion was obtained in the same manner as in Example 1 except that the water-soluble basic dye was not used.
[0083]
Thereafter, 5 g of a water-soluble basic dye ("AIZEN CATHILON PINK FGH" manufactured by Hodogaya Chemical Co., Ltd.), 1000 g of propylene glycol and 3000 g of distilled water are added to this aqueous dispersion and stirred uniformly to obtain a red ink composition. Obtained.
[0084]
Comparative Example 4
Water-soluble acrylic resin [Johnson Polymer Co., Ltd., “JONCRYL 61J” (solid content 30%)] 25 g, water-soluble basic dye [Hodogaya Chemical Co., Ltd. “AIZEN CATILON PINK FGH”] 2 g, propylene A red ink composition was obtained by mixing 10 g of glycol and 63 g of distilled water and stirring and dissolving for 1 hour.
[0085]
Comparative Example 5
A blue ink composition was obtained by mixing 1 g of water-soluble blue dye [“AIZEN VICTORIA PURE BLUE BOH” manufactured by Hodogaya Chemical Co., Ltd.], 10 g of propylene glycol, and 89 g of distilled water and stirring and dissolving for 1 hour.
[0086]
The obtained results are shown in Table 1.
[0087]
[Table 1]
Figure 0003904674
[0088]
Example 3
A 2 liter flask was equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer addition, set in a warm water tank, charged with 250 g of distilled water, and introducing nitrogen gas The internal temperature was raised to 60 ° C.
[0089]
On the other hand, a water-soluble basic dye [Hodogaya Chemical Co., Ltd.] was added to 500 g of a mixed monomer composed of 200 g of methyl methacrylate, 100 g of methacrylonitrile, and 200 g of 2-methacryloyloxyethyl succinate (manufactured by Mitsubishi Rayon Co., Ltd., “acrylic ester SA”). 40 g of “AIZEN CATHILON RED BLH 200%” manufactured by Kogyo Co., Ltd. was mixed, and 250 g of distilled water and 50 g of a polymerizable surfactant [“Adekaria Soap SE-10N” manufactured by Asahi Denka Kogyo Co., Ltd.] were mixed and stirred. A liquid in which 3 g of ammonium persulfate was dissolved and then dissolved was prepared.
[0090]
This prepared liquid was added from the above separatory funnel to a flask maintained at a temperature of about 60 ° C. over 3 hours with stirring, and the polymerization was terminated at 5 hours to obtain a colored fine particle aqueous dispersion.
[0091]
To this colored fine particle aqueous dispersion, 3000 g of distilled water and 1000 g of propylene glycol were added and stirred uniformly to obtain a red ink composition having a viscosity of 3.2 cp and a surface tension of 51 dyn / cm.
[0092]
The particle diameter of the colored resin fine particles in the red ink composition was 0.16 μm. The red ink composition had excellent water resistance and light resistance, and exhibited a clear red color without bleeding and clogging.
[0093]
Example 4
A 2 liter flask was equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer addition, set in a warm water tank, charged with 250 g of distilled water, and introducing nitrogen gas The internal temperature was raised to 50 ° C.
[0094]
On the other hand, to 500 g of a mixed monomer composed of 100 g of styrene, 200 g of methyl methacrylate, 100 g of methacrylonitrile, and 100 g of methacrylic acid, 30 g of a water-soluble basic dye (“AIZEN PURE BLUE 5GH 200%” manufactured by Hodogaya Chemical Co., Ltd.), 250 g of distilled water and 40 g of a polymerizable surfactant (“Latemul S-180” manufactured by Kao Corporation) were mixed with stirring to prepare a solution in which 3 g of ammonium persulfate was further dissolved.
[0095]
This preparation was added from the above separatory funnel to a flask maintained at a temperature of about 50 ° C. over 3 hours with stirring, and the polymerization was terminated at 5 hours to obtain a colored fine particle aqueous dispersion.
[0096]
To this colored fine particle aqueous dispersion, 3000 g of distilled water and 1000 g of propylene glycol were added and stirred uniformly to obtain a blue ink composition having a viscosity of 3.0 cp and a surface tension of 50 dyn / cm.
[0097]
The particle diameter of the colored resin fine particles in the blue ink composition was 0.14 μm. Further, the blue ink composition had excellent water resistance and light resistance, and exhibited a clear blue color without bleeding and clogging.
[0098]
Comparative Example 6
An ink composition was prepared in the same manner as in Example 3, except that 500 g of the mixed monomer was replaced with 500 g of the mixed monomer composed of 300 g of methyl methacrylate and 200 g of methacrylonitrile.
[0099]
The obtained ink composition had a viscosity of 10.5 cp and a surface tension of 37 dyn / cm, and was subjected to sharpness. The particle diameter of the red resin fine particles in the ink composition was 0.44 μm.
[0100]
Comparative Example 7
An uncolored resin fine particle aqueous dispersion was obtained in the same manner as in Example 3 except that the water-soluble basic dye was not used.
[0101]
Thereafter, 5 g of a water-soluble basic dye ("AIZEN CATHILON PINK FGH" manufactured by Hodogaya Chemical Co., Ltd.), 1000 g of propylene glycol and 3000 g of distilled water are added to this aqueous dispersion and stirred uniformly to obtain a red ink composition. Obtained.
[0102]
The obtained results are shown in Table 2.
[0103]
[Table 2]
Figure 0003904674
[0104]
Example 5
A 2 liter flask was equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer addition, set in a warm water tank, charged with 250 g of distilled water, and introducing nitrogen gas The internal temperature is raised to 60 ° C.
[0105]
On the other hand, to 500 g of a mixed monomer composed of 250 g of methyl methacrylate and 250 g of 2-methacryloyloxyethyl succinate [manufactured by Mitsubishi Rayon Co., Ltd., “acrylic ester SA”], a water-soluble basic dye [manufactured by Hodogaya Chemical Co., Ltd.] 30 g of “AIZENCATHILON RED BLH 200%”] is mixed, and 250 g of distilled water and 50 g of a polymerizable surfactant (“Adeka Soap SE-10N” manufactured by Asahi Denka Kogyo Co., Ltd.) are mixed and dispersed, then ammonium persulfate. A solution in which 3 g was dissolved was prepared.
[0106]
This prepared liquid was added from the above separatory funnel to a flask maintained at a temperature of about 60 ° C. over 3 hours with stirring, and the polymerization was terminated at 5 hours to obtain an aqueous dispersion of colored resin fine particles for ink.
[0107]
To this colored resin fine particle aqueous dispersion, 3000 g of distilled water and 1000 g of propylene glycol were added and stirred uniformly to obtain a red ink composition having a viscosity of 2.8 cp and a surface tension of 52 dyn / cm.
[0108]
The particle diameter of the colored resin fine particles in the red ink composition was 0.12 μm. The red ink composition had excellent water resistance and light resistance, and exhibited a clear red color without bleeding and clogging.
[0109]
Example 6
A 2 liter flask was equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer addition, set in a warm water tank, charged with 250 g of distilled water, and introducing nitrogen gas The internal temperature is raised to 50 ° C.
[0110]
On the other hand, 500 g of a mixed monomer composed of 200 g of styrene, 200 g of methyl methacrylate and 100 g of methacrylic acid, 25 g of a water-soluble basic dye [“AIZEN PURE BLUE 5GH 200%” manufactured by Hodogaya Chemical Co., Ltd.], 250 g of distilled water and polymerization 30 g of a surfactant (“Latemul S-180” manufactured by Kao Corporation) was mixed with stirring to prepare a solution in which 3 g of ammonium persulfate was further dissolved. This prepared liquid was added from the above separatory funnel into a flask maintained at a temperature of about 50 ° C. over 3 hours with stirring, and the polymerization was terminated at 5 hours to obtain an aqueous dispersion of colored resin fine particles for ink.
[0111]
To this colored resin fine particle aqueous dispersion, 3000 g of distilled water and 1000 g of propylene glycol were added and stirred uniformly to obtain a blue ink composition having a viscosity of 3.2 cp and a surface tension of 49 dyn / cm.
[0112]
The particle diameter of the colored resin fine particles in the blue ink composition was 0.15 μm. Further, the blue ink composition had excellent water resistance and light resistance, and exhibited a clear blue color without bleeding and clogging.
[0113]
Comparative Example 8
An uncolored resin fine particle aqueous dispersion was obtained in the same manner as in Example 5 except that the water-soluble basic dye was not used.
[0114]
Thereafter, 5 g of a water-soluble basic dye ["AIZEN CATHILON PINK FGH" manufactured by Hodogaya Chemical Co., Ltd.] was mixed with this aqueous dispersion, and further 3000 g of distilled water and 1000 g of propylene glycol were added and stirred uniformly. A red ink composition was obtained.
[0115]
The obtained results are shown in Table 3.
[0116]
[Table 3]
Figure 0003904674
[0117]
Example 7
A 2 liter flask was equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer addition, set in a warm water tank, charged with 250 g of distilled water, and introducing nitrogen gas The internal temperature is raised to 60 ° C. On the other hand, 150 g of methyl methacrylate, 150 g of trifluoroethyl methacrylate [manufactured by Mitsubishi Rayon Co., Ltd., “acrylic ester 3FE”], 200 g of 2-methacryloyloxyethyl succinate [manufactured by Mitsubishi Rayon Co., Ltd., “acrylic ester SA”] 30 g of a water-soluble basic dye ("AIZEN CATHILON RED BLH 200%" manufactured by Hodogaya Chemical Industry Co., Ltd.)] was mixed with 500 g of the mixed monomer, and 250 g of distilled water and a polymerizable surfactant [Asahi Denka Kogyo ( "Adekaria soap SE-10N"] 50 g was mixed and stirred and dispersed, and then a solution in which 3 g of ammonium persulfate was dissolved was prepared.
[0118]
This prepared liquid was added from the above separatory funnel to a flask maintained at a temperature of about 60 ° C. over 3 hours with stirring, and the polymerization was terminated in 5 hours to obtain a colored fine particle aqueous decomposition liquid for ink.
[0119]
Distilled water 3000 g and propylene glycol 1000 g were added to this colored fine particle aqueous decomposition solution for ink and stirred uniformly to obtain a red ink composition having a viscosity of 3.0 cp and a surface tension of 52 dyn / cm.
[0120]
The particle diameter of the colored resin fine particles in the red ink composition was 0.14 μm. The red ink composition had excellent water resistance and light resistance, and exhibited a clear red color without bleeding and clogging.
[0121]
Example 8
A 2 liter flask was equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer addition, set in a warm water tank, charged with 250 g of distilled water, and introducing nitrogen gas The internal temperature is raised to 50 ° C. On the other hand, to 500 g of a mixed monomer composed of 100 g of styrene, 200 g of methyl methacrylate, 100 g of heptadecafluorodecyl methacrylate and 100 g of methacrylic acid, a water-soluble basic dye ["AIZEN PURE BLUE5GH 200%" manufactured by Hodogaya Chemical Co., Ltd.] 25 g, distilled water 250 g and polymerizable surfactant [“Latemul S-180” manufactured by Kao Co., Ltd.] 30 g were mixed with stirring to prepare a solution in which 3 g of ammonium persulfate was further dissolved.
[0122]
This prepared liquid was added from the above separatory funnel to a flask maintained at a temperature of about 50 ° C. over 3 hours with stirring, and the polymerization was terminated at 5 hours to obtain a colored fine particle aqueous decomposition liquid for ink.
[0123]
Distilled water 3000 g and propylene glycol 1000 g were added to the colored fine particle aqueous decomposition solution for ink and stirred uniformly to obtain a blue ink composition having a viscosity of 2.9 cp and a surface tension of 50 dyn / cm.
[0124]
The particle diameter of the colored resin fine particles in the blue ink composition was 0.13 μm. Further, the blue ink composition had excellent water resistance and light resistance, and exhibited a clear blue color without bleeding and clogging.
[0125]
Comparative Example 9
An ink composition was prepared in the same manner as in Example 7 except that 500 g of the mixed monomer was replaced with 300 g of methyl methacrylate and 200 g of trifluoroethyl methacrylate (acrylic ester 3FE).
[0126]
The obtained ink composition had a viscosity of 10.1 cp and a surface tension of 38 dyn / cm, and was subjected to sharpness. The particle diameter of the red resin fine particles in the ink composition was 0.40 μm.
[0127]
Comparative Example 10
An aqueous dispersion of uncolored resin fine particles was obtained in the same manner as in Example 7 except that the water-soluble basic dye was not used.
[0128]
Thereafter, 2 g of a water-soluble basic dye ["AIZEN CATILON PINK FGH" manufactured by Hodogaya Chemical Co., Ltd.], 10 g of propylene glycol, 3000 g of distilled water, and 1000 g of propylene glycol were added to this aqueous dispersion, and the mixture was stirred uniformly to obtain a red ink. A composition was obtained.
[0129]
Table 4 shows the obtained results.
[0130]
[Table 4]
Figure 0003904674
[0131]
Example 9
A 2 liter flask is equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer addition, set in a hot water tank, 500 g of distilled water, polymerizable surfactant “Adekari Soap SE” -10N (manufactured by Asahi Denka Kogyo Co., Ltd.) "and 3 g of ammonium persulfate are charged, and the temperature is raised to 80 ° C. while introducing nitrogen gas.
[0132]
On the other hand, a mixed monomer comprising 200 g of methyl methacrylate, 100 g of triallyl cyanurate, 200 g of 2-methacryloyloxyethyl hexahydrophthalate (manufactured by Mitsubishi Rayon Co., Ltd., acrylic ester HH, solubility in water = 3.40% by weight) A solution was prepared by dissolving 40 g of a water-soluble basic dye “AIZEN CATHILON RED BLH 200% (manufactured by Hodogaya Chemical Co., Ltd.)” in 500 g.
[0133]
This prepared liquid was added from the above separatory funnel to a flask maintained at a temperature of about 80 ° C. over 3 hours with stirring, and further aged for 5 hours to complete the polymerization to obtain a colored resin fine particle aqueous dispersion for ink. .
[0134]
Distilled water 3000 g and propylene glycol 1000 g were added to the colored resin fine particle aqueous dispersion for ink and stirred uniformly to obtain a red ink composition having a viscosity of 2.9 cp and a surface tension of 50 dyn / cm.
[0135]
The particle diameter of the colored resin fine particles in the red ink composition was 0.13 μm. The red ink composition had excellent water resistance and light resistance, and exhibited a clear red color without bleeding and clogging.
[0136]
Example 10
A 2 liter flask was equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer addition, set in a hot water tank, 500 g of distilled water, polymerizable surfactant “Latemul S-180A” (Kao Co., Ltd.) 40 g and ammonium persulfate 3 g are charged, and the internal temperature is raised to 60 ° C. while introducing nitrogen gas.
[0137]
On the other hand, it is water-soluble in 500 g of a mixed monomer composed of 200 g of styrene, 100 g of triallyl cyanurate, and 200 g of 2-methacryloyloxyethyl phthalate (manufactured by Mitsubishi Rayon Co., Ltd., acrylic ester PA, solubility in water = 0.08 wt%). A solution in which 50 g of basic dye “AIZEN PURE BLUE 5GH 200% (manufactured by Hodogaya Chemical Co., Ltd.)” was dissolved was prepared.
[0138]
This prepared liquid was added from the above separatory funnel to a flask maintained at a temperature of about 60 ° C. over 3 hours with stirring, and further aged for 5 hours to complete the polymerization to obtain a colored resin fine particle aqueous dispersion for ink. .
[0139]
Distilled water 3000 g and propylene glycol 1000 g were added to this colored resin fine particle aqueous dispersion for ink and stirred uniformly to obtain a blue ink composition having a viscosity of 3.0 cp and a surface tension of 52 dyn / cm.
[0140]
The particle diameter of the colored resin fine particles in the blue ink composition was 0.12 μm. Further, the blue ink composition had excellent water resistance and light resistance, and exhibited a clear blue color without bleeding and clogging.
[0141]
Comparative Example 11
An ink composition was prepared in the same manner as in Example 9, except that 200 g of 2-methacryloyloxyethyl hexahydrophthalate was replaced with 200 g of methacrylic acid (solubility in water = ∞). However, during the preparation of the colored resin fine particle aqueous dispersion for ink, gelation occurred and an ink composition could not be obtained.
[0142]
Comparative Example 12
An uncolored resin fine particle aqueous dispersion was obtained in the same manner as in Example 9 except that the water-soluble basic dye was not used.
[0143]
Thereafter, 10 g of a water-soluble basic dye “AIZEN CATHILOPINK FGH (manufactured by Hodogaya Chemical Co., Ltd.)”, 3000 g of distilled water and 1000 g of propylene glycol are added to this aqueous dispersion and stirred uniformly to obtain a red ink composition. Obtained.
[0144]
The results obtained are shown in Table 5.
[0145]
[Table 5]
Figure 0003904674
[0146]
The measuring methods in the following examples and comparative examples followed the following methods. In addition, the measuring method of a particle diameter, a viscosity, and surface tension was performed similarly to the above.
[0147]
(Clarity)
The vividness of the characters written on the writing paper was judged visually.
○: Clear.
Δ: Slightly cloudy.
X: It is cloudy.
[0148]
(Bleed)
The degree of bleeding of the characters written on the writing paper was visually determined.
○: No bleeding.
Δ: Slightly blots.
×: bleeding.
[0149]
(water resistant)
The letters written on the writing paper were immersed in water for 1 hour, and the degree of bleeding was visually determined.
○: No bleeding.
Δ: Slightly blots.
×: bleeding.
[0150]
(Light resistance)
The letters written on the writing paper were irradiated to the fade meter 1, and the time required for fading was measured.
[0151]
(Storage stability)
The ink composition was filled in a water-based sign pen container, placed in a thermostatic bath at 50 ° C., and the number of days until writing became impossible was measured.
[0152]
Example 11
A 2 liter flask was equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer addition, set in a hot water tank, 500 g of distilled water, polymerizable surfactant [Asahi Denka Kogyo Co., Ltd. 50 g of “ADEKA rear soap SE-10N” manufactured by KK and 3 g of ammonium persulfate were charged, and the internal temperature was raised to 50 ° C. while introducing nitrogen gas.
[0153]
On the other hand, to 500 g of a mixed monomer consisting of 200 g of methyl methacrylate, 100 g of triallyl cyanurate, 2-methacryloyloxyethyl succinate (“Mitsubishi Rayon Co., Ltd.,“ acrylic ester SA ”), water-soluble basic dye [Hodogaya A liquid in which 40 g of “AIZEN CATILON RED BLH 200%” manufactured by Chemical Industry Co., Ltd. was mixed was prepared.
[0154]
This preparation solution was added from the above separatory funnel to a flask maintained at a temperature of about 50 ° C. over 3 hours with stirring to carry out emulsion polymerization. Further, aging was performed for 5 hours to complete the polymerization, and a colored fine particle aqueous dispersion was obtained.
[0155]
To this colored fine particle aqueous dispersion, 3000 g of distilled water and 1000 g of propylene glycol were added and stirred uniformly to obtain a red ink composition having a viscosity of 2.8 cp and a surface tension of 50 dyn / cm.
[0156]
The particle diameter of the colored resin fine particles in the red ink composition was 0.14 μm. The red ink composition had excellent water resistance and light resistance, and exhibited a clear red color without bleeding and clogging.
[0157]
Example 12
A 2 liter flask was equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer introduction, set in a warm water tank, 500 g of distilled water, a polymerizable surfactant [Kao Corporation ) “Latemul S-180”] and 40 g of ammonium persulfate were charged, and the internal temperature was raised to 50 ° C. while introducing nitrogen gas.
[0158]
On the other hand, to 500 g of a mixed monomer composed of 100 g of styrene, 200 g of methyl methacrylate, 100 g of triallyl cyanurate, and 100 g of methacrylic acid, 30 g of water-soluble basic dye [“AIZEN PURE BLUE 5GH 200%” manufactured by Hodogaya Chemical Co., Ltd.] Was mixed with stirring.
[0159]
This preparation was added from the above separatory funnel to a flask maintained at a temperature of about 50 ° C. over 3 hours with stirring to carry out emulsion polymerization. Further, aging was performed for 5 hours to complete the polymerization, and a colored fine particle aqueous dispersion was obtained.
[0160]
To this colored fine particle aqueous dispersion, 3000 g of distilled water and 1000 g of propylene glycol were added and stirred uniformly to obtain a blue ink composition having a viscosity of 3.0 cp and a surface tension of 52 dyn / cm.
[0161]
The particle diameter of the colored resin fine particles in the blue ink composition was 0.13 μm. Further, the blue ink composition had excellent water resistance and light resistance, and exhibited a clear blue color without bleeding and clogging.
[0162]
Comparative Example 13
An ink composition was prepared in the same manner as in Example 11 except that 500 g of the mixed monomer was replaced with 500 g of a single monomer methyl methacrylate.
[0163]
The obtained ink composition had a viscosity of 9.6 cp and a surface tension of 42 dyn / cm, and lacked clarity. The particle diameter of the colored resin fine particles in the ink composition was 0.34 μm.
[0164]
Comparative Example 14
An ink composition was prepared in the same manner as in Example 1 except that 500 g of the mixed monomer was replaced with 500 g of the mixed monomer composed of 500 g of methyl methacrylate and 200 g of triallyl cyanurate.
[0165]
The obtained ink composition had a viscosity of 13.1 cp and a surface tension of 36 dyn / cm, and was subjected to sharpness. The particle diameter of the red resin fine particles in the ink composition was 0.56 μm.
[0166]
Comparative Example 15
An uncolored resin fine particle aqueous dispersion was obtained in the same manner as in Example 11 except that the water-soluble basic dye was not used.
[0167]
Thereafter, 5 g of a water-soluble basic dye ("AIZEN CATHILON PINK FGH" manufactured by Hodogaya Chemical Co., Ltd.), 1000 g of propylene glycol and 3000 g of distilled water are added to this aqueous dispersion and stirred uniformly to obtain a red ink composition. Obtained.
[0168]
Comparative Example 16
Water-soluble acrylic resin [Johnson Polymer Co., Ltd., “JONCRYL 61J” (solid content 30%)] 25 g, water-soluble basic dye [Hodogaya Chemical Co., Ltd. “AIZEN CATILON PINK FGH”] 2 g, propylene A red ink composition was obtained by mixing 10 g of glycol and 63 g of distilled water and stirring and dissolving for 1 hour.
[0169]
Comparative Example 17
A blue ink composition was obtained by mixing 1 g of water-soluble blue dye [“AIZEN VICTORIA PURE BLUE BOH” manufactured by Hodogaya Chemical Co., Ltd.], 10 g of propylene glycol and 89 g of distilled water and stirring and dissolving for 1 hour.
[0170]
The results obtained are shown in Table 6.
[0171]
[Table 6]
Figure 0003904674
[0172]
Example 13
A 2 liter flask was equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer addition, set in a hot water tank, 500 g of distilled water, polymerizable surfactant [Asahi Denka Kogyo Co., Ltd. 50 g of “ADEKA rear soap SE-10N” manufactured by KK and 3 g of ammonium persulfate were charged, and the internal temperature was raised to 50 ° C. while introducing nitrogen gas.
[0173]
On the other hand, a water-soluble basic dye [Hodogaya Chemical Co., Ltd.] was added to 500 g of a mixed monomer composed of 200 g of methyl methacrylate, 100 g of methacrylonitrile, and 200 g of 2-methacryloyloxyethyl succinate (manufactured by Mitsubishi Rayon Co., Ltd., “acrylic ester SA”). A liquid in which 40 g of “AIZEN CATHILON RED BLH 200%” manufactured by Kogyo Co., Ltd. was mixed was prepared.
[0174]
This prepared liquid was added from the above separatory funnel to a flask maintained at a temperature of about 50 ° C. over 3 hours with stirring, and the polymerization was terminated at 5 hours to obtain a colored fine particle aqueous dispersion.
[0175]
To this colored fine particle aqueous dispersion, 3000 g of distilled water and 1000 g of propylene glycol were added and stirred uniformly to obtain a red ink composition having a viscosity of 3.0 cp and a surface tension of 50 dyn / cm.
[0176]
The particle diameter of the colored resin fine particles in the red ink composition was 0.14 μm. The red ink composition had excellent water resistance and light resistance, and exhibited a clear red color without bleeding and clogging.
[0177]
Example 14
A 2 liter flask was equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer introduction, set in a warm water tank, 500 g of distilled water, a polymerizable surfactant [Kao Corporation ) “Latemul S-180”] and 40 g of ammonium persulfate were charged, and the internal temperature was raised to 50 ° C. while introducing nitrogen gas.
[0178]
On the other hand, 30 g of water-soluble basic dye ["AIZEN PURE BLUE 5GH 200%" manufactured by Hodogaya Chemical Co., Ltd.] is added to 500 g of a mixed monomer composed of 100 g of styrene, 200 g of methyl methacrylate, 100 g of methacrylonitrile, and 100 g of methacrylic acid. A liquid with stirring and mixing was prepared.
[0179]
This preparation was added from the above separatory funnel to a flask maintained at a temperature of about 50 ° C. over 3 hours with stirring, and the polymerization was terminated at 5 hours to obtain a colored fine particle aqueous dispersion.
[0180]
To this colored fine particle aqueous dispersion, 3000 g of distilled water and 1000 g of propylene glycol were added and stirred uniformly to obtain a blue ink composition having a viscosity of 2.8 cp and a surface tension of 52 dyn / cm.
[0181]
The particle diameter of the colored resin fine particles in the blue ink composition was 0.13 μm. Further, the blue ink composition had excellent water resistance and light resistance, and exhibited a clear blue color without bleeding and clogging.
[0182]
Comparative Example 18
An ink composition was prepared in the same manner as in Example 13 except that 500 g of the mixed monomer was replaced with 500 g of the mixed monomer composed of 300 g of methyl methacrylate and 200 g of methacrylonitrile.
[0183]
The obtained ink composition had a viscosity of 9.1 cp and a surface tension of 38 dyn / cm, and was subjected to sharpness. The particle diameter of the red resin fine particles in the ink composition was 0.45 μm.
[0184]
Comparative Example 19
An uncolored resin fine particle aqueous dispersion was obtained in the same manner as in Example 13 except that the water-soluble basic dye was not used.
[0185]
Thereafter, 5 g of a water-soluble basic dye ("AIZEN CATHILON PINK FGH" manufactured by Hodogaya Chemical Co., Ltd.), 1000 g of propylene glycol and 3000 g of distilled water are added to this aqueous dispersion and stirred uniformly to obtain a red ink composition. Obtained.
[0186]
The results obtained are shown in Table 7.
[0187]
[Table 7]
Figure 0003904674
[0188]
Example 15
A 2 liter flask was equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer addition, set in a hot water tank, 500 g of distilled water, polymerizable surfactant [Asahi Denka Kogyo Co., Ltd. “Adekaria Soap SE-10N” manufactured by Co., Ltd.] and 3 g of ammonium persulfate are charged, and the internal temperature is raised to 50 ° C. while introducing nitrogen gas.
[0189]
On the other hand, to 500 g of a mixed monomer composed of 250 g of methyl methacrylate and 250 g of 2-methacryloyloxyethyl succinate [“Acrylic ester SA” manufactured by Mitsubishi Rayon Co., Ltd.], a water-soluble basic dye [manufactured by Hodogaya Chemical Co., Ltd. “ AIZEN CATHILON RED BLH 200% "] 40 g was mixed.
[0190]
This prepared liquid was added from the above separatory funnel to a flask maintained at a temperature of about 50 ° C. over 3 hours with stirring, and the polymerization was terminated at 5 hours to obtain a colored resin fine particle aqueous dispersion.
[0191]
To this resin fine particle aqueous dispersion, 3000 g of distilled water and 1000 g of propylene glycol were added and stirred uniformly to obtain a red ink composition for a writing instrument having a viscosity of 2.9 cp and a surface tension of 52 dyn / cm.
[0192]
The particle diameter of the colored resin fine particles in this red ink composition was 0.13 μm. The red ink composition had excellent water resistance and light resistance, and exhibited a clear red color without bleeding and clogging.
[0193]
Example 16
A 2 liter flask was equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer introduction, set in a warm water tank, 500 g of distilled water, a polymerizable surfactant [Kao Corporation ) “Latemul S-180”] 40 g and 3 g of ammonium persulfate are charged, and the internal temperature is raised to 50 ° C. while introducing nitrogen gas.
[0194]
On the other hand, a mixture of 500 g of a mixed monomer composed of 200 g of styrene, 200 g of methyl methacrylate and 100 g of methacrylic acid and 30 g of a water-soluble basic dye ["AIZEN PURE BLUE 5GH 200%" manufactured by Hodogaya Chemical Co., Ltd.] is prepared. did.
[0195]
This preparation was added from the above separatory funnel to a flask maintained at a temperature of about 50 ° C. over 3 hours with stirring, and the polymerization was terminated at 5 hours to obtain a colored resin fine particle aqueous dispersion.
[0196]
To this resin fine particle aqueous dispersion, 3000 g of distilled water and 1000 g of propylene glycol were added and stirred uniformly to obtain a blue ink composition for a writing instrument having a viscosity of 3.0 cp and a surface tension of 50 dyn / cm.
[0197]
The particle diameter of the colored resin fine particles in this blue ink composition was 0.14 μm. Further, the blue ink composition had excellent water resistance and light resistance, and exhibited a clear blue color without bleeding and clogging.
[0198]
Comparative Example 20
An aqueous dispersion of uncolored resin fine particles was obtained in the same manner as in Example 15 except that the water-soluble basic dye was not used.
[0199]
Thereafter, 5 g of a water-soluble basic dye ["AIZEN CATHILON PINK FGH" manufactured by Hodogaya Chemical Co., Ltd.] was mixed with this aqueous dispersion, and further 3000 g of distilled water and 1000 g of propylene glycol were added and stirred uniformly. A red ink composition was obtained.
[0200]
Table 8 shows the obtained results.
[0201]
[Table 8]
Figure 0003904674
[0202]
Example 17
A 2 liter flask was equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer addition, set in a hot water tank, 500 g of distilled water, polymerizable surfactant [Asahi Denka Kogyo Co., Ltd. “Adekaria Soap SE-10N” manufactured by Co., Ltd.] and 3 g of ammonium persulfate are charged, and the internal temperature is raised to 50 ° C. while introducing nitrogen gas.
[0203]
On the other hand, 150 g of methyl methacrylate, 150 g of trifluoroethyl methacrylate [“Acrylic ester 3FE” manufactured by Mitsubishi Rayon Co., Ltd.], 200 g of 2-methacryloyloxyethyl succinate [“Acrylic ester SA” manufactured by Mitsubishi Rayon Co., Ltd.] A mixture of 500 g of the above mixed monomer with 40 g of a water-soluble basic dye [“AIZEN CATHILON RED BLH 200%” manufactured by Hodogaya Chemical Co., Ltd.] was prepared.
[0204]
This prepared liquid was added from the above separatory funnel to a flask maintained at a temperature of about 50 ° C. over 3 hours with stirring, and the polymerization was terminated at 5 hours to obtain a colored resin fine particle aqueous dispersion.
[0205]
To this resin fine particle aqueous dispersion, 3000 g of distilled water and 1000 g of propylene glycol were added and stirred uniformly to obtain a red ink composition for a writing instrument having a viscosity of 2.9 cp and a surface tension of 52 dyn / cm.
[0206]
The particle diameter of the colored resin fine particles in this red ink composition was 0.13 μm. The red ink composition had excellent water resistance and light resistance, and exhibited a clear red color without bleeding and clogging.
[0207]
Example 18
A 2 liter flask was equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer introduction, set in a warm water tank, 500 g of distilled water, a polymerizable surfactant [Kao Corporation ) “Latemul S-180”] 40 g and 3 g of ammonium persulfate are charged, and the internal temperature is raised to 50 ° C. while introducing nitrogen gas.
[0208]
On the other hand, a mixed monomer 500 g consisting of 100 g of styrene, 200 g of methyl methacrylate, 100 g of heptadecafluorodecyl methacrylate and 100 g of methacrylic acid was added to a water-soluble basic dye ["AIZEN PURE BLUE 5GH 200%" manufactured by Hodogaya Chemical Co., Ltd. A solution in which 30 g was mixed was prepared.
[0209]
This preparation was added from the above separatory funnel to a flask maintained at a temperature of about 50 ° C. over 3 hours with stirring, and the polymerization was terminated at 5 hours to obtain a colored resin fine particle aqueous dispersion.
[0210]
To this resin fine particle aqueous dispersion, 3000 g of distilled water and 1000 g of propylene glycol were added and stirred uniformly to obtain a blue ink composition for a writing instrument having a viscosity of 3.0 cp and a surface tension of 50 dyn / cm.
[0211]
The particle diameter of the colored resin fine particles in this blue ink composition was 0.12 μm. Further, the blue ink composition had excellent water resistance and light resistance, and exhibited a clear blue color without bleeding and clogging.
[0212]
Comparative Example 21
An ink composition was prepared in the same manner as in Example 17 except that 500 g of the mixed monomer was replaced with 300 g of methyl methacrylate and 200 g of trifluoroethyl methacrylate (acrylic ester 3FE).
[0213]
The obtained ink composition had a viscosity of 10.1 cp and a surface tension of 38 dyn / cm, and was subjected to sharpness. The particle diameter of the red resin fine particles in the ink composition was 0.40 μm.
[0214]
Comparative Example 22
An aqueous dispersion of uncolored resin fine particles was obtained in the same manner as in Example 17 except that the water-soluble basic dye was not used.
[0215]
Thereafter, 5 g of a water-soluble basic dye ["AIZEN CATHILON PINK FGH" manufactured by Hodogaya Chemical Co., Ltd.], 3000 g of distilled water, and 1000 g of propylene glycol are added to this aqueous dispersion and stirred uniformly to obtain a red ink composition. It was.
[0216]
Table 9 shows the obtained results.
[0217]
[Table 9]
Figure 0003904674
[0218]
Example 19
A 2 liter flask is equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer addition, set in a hot water tank, 500 g of distilled water, polymerizable surfactant “Adekari Soap SE” -10N (manufactured by Asahi Denka Kogyo Co., Ltd.) "and 3 g of ammonium persulfate are charged, and the temperature is raised to 80 ° C. while introducing nitrogen gas.
[0219]
On the other hand, a mixed monomer comprising 200 g of methyl methacrylate, 100 g of triallyl cyanurate, 200 g of 2-methacryloyloxyethyl hexahydrophthalate (manufactured by Mitsubishi Rayon Co., Ltd., acrylic ester HH, solubility in water = 3.40% by weight) A solution was prepared by dissolving 40 g of a water-soluble basic dye “AIZEN CATHILON RED BLH 200% (manufactured by Hodogaya Chemical Co., Ltd.)” in 500 g.
[0220]
This prepared liquid was added from the above separatory funnel to a flask maintained at a temperature of about 80 ° C. over 3 hours with stirring, and further aged for 5 hours to complete the polymerization to obtain a colored resin fine particle aqueous dispersion for ink. .
[0221]
Distilled water 3000 g and propylene glycol 1000 g were added to the colored resin fine particle aqueous dispersion for ink and stirred uniformly to obtain a red ink composition having a viscosity of 2.9 cp and a surface tension of 50 dyn / cm.
[0222]
The particle diameter of the colored resin fine particles in the red ink composition was 0.13 μm. The red ink composition had excellent water resistance and light resistance, and exhibited a clear red color without bleeding and clogging.
[0223]
Example 20
A 2 liter flask was equipped with a stirrer, reflux condenser, thermometer, nitrogen gas inlet tube, 1000 ml separatory funnel for monomer addition, set in a hot water tank, 500 g of distilled water, polymerizable surfactant “Latemul S-180A” (Kao Co., Ltd.) 40 g and ammonium persulfate 3 g are charged, and the internal temperature is raised to 60 ° C. while introducing nitrogen gas.
[0224]
On the other hand, it is water-soluble in 500 g of a mixed monomer composed of 200 g of styrene, 100 g of triallyl cyanurate, and 200 g of 2-methacryloyloxyethyl phthalate (manufactured by Mitsubishi Rayon Co., Ltd., acrylic ester PA, solubility in water = 0.08 wt%). A solution in which 50 g of basic dye “AIZEN PURE BLUE 5GH 200% (manufactured by Hodogaya Chemical Co., Ltd.)” was dissolved was prepared.
[0225]
This prepared liquid was added from the above separatory funnel to a flask maintained at a temperature of about 60 ° C. over 3 hours with stirring, and further aged for 5 hours to complete the polymerization to obtain a colored resin fine particle aqueous dispersion for ink. .
[0226]
Distilled water 3000 g and propylene glycol 1000 g were added to this colored resin fine particle aqueous dispersion for ink and stirred uniformly to obtain a blue ink composition having a viscosity of 3.0 cp and a surface tension of 52 dyn / cm.
[0227]
The particle diameter of the colored resin fine particles in the blue ink composition was 0.12 μm. Further, the blue ink composition had excellent water resistance and light resistance, and exhibited a clear blue color without bleeding and clogging.
[0228]
Comparative Example 23
An ink composition was prepared in the same manner as in Example 19 except that 200 g of 2-methacryloyloxyethyl hexahydrophthalate was replaced with 200 g of methacrylic acid (solubility in water = ∞). However, during the preparation of the colored resin fine particle aqueous dispersion for ink, gelation occurred and an ink composition could not be obtained.
[0229]
Comparative Example 24
An uncolored resin fine particle aqueous dispersion was obtained in the same manner as in Example 19 except that the water-soluble basic dye was not used.
[0230]
Thereafter, 10 g of a water-soluble basic dye “AIZEN CATHILOPINK FGH (manufactured by Hodogaya Chemical Co., Ltd.)”, 3000 g of distilled water and 1000 g of propylene glycol are added to this aqueous dispersion and stirred uniformly to obtain a red ink composition. Obtained.
[0231]
Table 10 shows the obtained results.
[0232]
[Table 10]
Figure 0003904674
[0233]
【The invention's effect】
Since the colored resin fine particle aqueous dispersion for water-based ink of the present invention contains colored resin fine particles prepared by emulsion polymerization of a vinyl monomer in which a water-soluble basic dye is dissolved in advance, it exhibits a vivid color, The resin particles do not aggregate or settle for a long time.
[0234]
The ink composition for a writing instrument of the present invention gives a clear and non-bleeded writing character or drawing line that does not bleed or disappear due to water or sweat, and does not become cloudy due to color mixing. In addition, it is excellent in water resistance and light resistance that does not change even if letters and drawn lines are left for a long period of time.
[0235]
The water-based ink composition for an ink jet recording apparatus of the present invention is excellent in stability. Also, ink jet recording using this ink composition gives a clear image without bleeding on the printed part, and is excellent in water resistance and light resistance.

Claims (7)

酸性官能基として水への溶解度が10重量%以下のカルボキシル基含有ビニルモノマーを5〜90重量%含有すると共に、シアノ基、トリアジン環およびフッ素基のうち少なくとも一つの置換基を有するビニルモノマーを含有し、かつ、残部に疎水性ビニルモノマーを含有し、水溶性塩基性染料をモノマー全量に対して0.2〜50重量%を溶解し、当該混合ビニルモノマーに対し、0.1〜50重量%の重合性界面活性剤の存在下で乳化重合して調製された水性インキ用着色樹脂微粒子水性分散液。  5 to 90% by weight of a carboxyl group-containing vinyl monomer having a solubility in water of 10% by weight or less as an acidic functional group, and a vinyl monomer having at least one substituent among a cyano group, a triazine ring and a fluorine group In addition, the balance contains a hydrophobic vinyl monomer, and 0.2 to 50% by weight of the water-soluble basic dye is dissolved with respect to the total amount of the monomer, and 0.1 to 50% by weight with respect to the mixed vinyl monomer. An aqueous dispersion of colored resin fine particles for water-based inks prepared by emulsion polymerization in the presence of a polymerizable surfactant. 請求項1記載の水性インキ用着色樹脂微粒子水性分散液と、水溶性有機溶媒と、水とを含有する水性インキ組成物。  A water-based ink composition comprising the aqueous dispersion of colored resin fine particles for water-based ink according to claim 1, a water-soluble organic solvent, and water. インキ組成物総量に対して、前記水性インキ用着色樹脂微粒子水性分散液の含有量が3〜30重量%(樹脂固形分換算)、前記水溶性有機溶媒の含有量が5〜80重量%、前記水の含有量が30〜90重量%である請求項2記載の水性インキ組成物。  The content of the aqueous dispersion of colored resin fine particles for water-based ink is 3 to 30% by weight (in terms of resin solid content), the content of the water-soluble organic solvent is 5 to 80% by weight, based on the total amount of the ink composition, The water-based ink composition according to claim 2, wherein the water content is 30 to 90% by weight. 請求項1記載の水性インキ用着色樹脂微粒子水性分散液と、水溶性有機溶媒と、水とを含有する筆記具用水性インキ組成物。  A water-based ink composition for a writing instrument comprising the aqueous dispersion of colored resin fine particles for water-based ink according to claim 1, a water-soluble organic solvent, and water. インキ組成物総量に対して、前記水性インキ用着色樹脂微粒子水性分散液の含有量が3〜30重量%(樹脂固形分換算)、前記水溶性有機溶媒の含有量が5〜80重量%、前記水の含有量が30〜90重量%である請求項4記載の筆記具用水性インキ組成物。  The content of the aqueous dispersion of colored resin fine particles for water-based ink is 3 to 30% by weight (in terms of resin solid content), the content of the water-soluble organic solvent is 5 to 80% by weight, based on the total amount of the ink composition, The water-based ink composition for a writing instrument according to claim 4, wherein the water content is 30 to 90% by weight. 請求項1記載の水性インキ用着色樹脂微粒子水性分散液と、水溶性有機溶媒と、水とを含有するインキジェット記録装置用水性インキ組成物。  A water-based ink composition for an ink jet recording apparatus, comprising the aqueous dispersion of colored resin fine particles for water-based ink according to claim 1, a water-soluble organic solvent, and water. インキ組成物総量に対して、前記水性インキ用着色樹脂微粒子水性分散液の含有量が3〜30重量%(樹脂固形分換算)、前記水溶性有機溶媒の含有量が5〜80重量%、前記水の含有量が30〜90重量%である請求項6記載のインキジェット記録装置用水性インキ組成物。  The content of the aqueous dispersion of colored resin fine particles for water-based ink is 3 to 30% by weight (in terms of resin solid content), the content of the water-soluble organic solvent is 5 to 80% by weight, based on the total amount of the ink composition, The water-based ink composition for an ink jet recording apparatus according to claim 6, wherein the water content is 30 to 90% by weight.
JP18280497A 1996-09-02 1997-07-08 Colored resin fine particle aqueous dispersion for water-based ink Expired - Fee Related JP3904674B2 (en)

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