JP4315581B2 - Inkjet recording sheet - Google Patents

Inkjet recording sheet Download PDF

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Publication number
JP4315581B2
JP4315581B2 JP2000239717A JP2000239717A JP4315581B2 JP 4315581 B2 JP4315581 B2 JP 4315581B2 JP 2000239717 A JP2000239717 A JP 2000239717A JP 2000239717 A JP2000239717 A JP 2000239717A JP 4315581 B2 JP4315581 B2 JP 4315581B2
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Japan
Prior art keywords
ink
receiving layer
water
recording sheet
jet recording
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JP2002052812A (en
Inventor
寛峰 山本
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Nisshinbo Holdings Inc
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Nisshinbo Holdings Inc
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Description

【0001】
【発明の属する技術分野】
本発明は、画像ににじみが生じることなく、発色性とインク定着性を維持しつつ、しかも、インク受理層と印画部が耐水性及び濡れた状態での耐擦過性に優れ、色再現性と耐光性にも優れたインクジェット記録用シートに関するものである。
【0002】
【従来の技術】
インクジェット記録用シートとしては、従来種々のものが提案され、実用に供されている。即ち、前記インクジェット記録用シートの被記録材に記録させるためのインクはアニオン性であるため、インクのにじみ性、発色性、インク定着性を向上させるために、例えば、特開昭62−268682号公報に開示されているように、被記録材にカチオン性有機物を含有させることが行われており、特に、4級アンモニウム塩、ジシアンジアミド系、ポリアミン系、アルキルアミン系の水溶性のカチオン性有機物を含有させる場合が極めて多い。
【0003】
しかしながら、被記録材に、上記の水溶性のカチオン性有機物を添加すると、塗工層自体の耐水性及び濡れた状態での耐擦過性の低下を招くばかりでなく、印画部の耐水性及び濡れた状態での耐擦過性も低下するし、色再現性、耐光性にも悪影響を与える。
【0004】
また、通常、インク受理層のバインダー樹脂として、ポリビニルアルコールが併用されるが、このポリビニルアルコールを単独又はこれを主成分としたバインダー樹脂を用いたインク受理層は耐水性が十分でなく、特に、カチオン性有機物質を含有させた場合、耐水性が著しく低下する。
【0005】
従って、インク受理層に水溶性のカチオン性有機物を添加する場合と比較して、インクのにじみ性、発色性、インク定着性を低下させること無く、且つ、塗工層自体と印画部の耐水性及び濡れた状態での耐擦過性、色再現性、耐光性に優れたインクジェット記録用シートの開発が望まれていたが、未だ十分満足すべきものは実現されていない。
【0006】
【発明が解決しようとする課題】
本発明は、上述のような従来技術に鑑み、画像ににじみが生じることなく、発色性とインク定着性を維持しつつ、しかも、インク受理層と印画部が耐水性及び濡れた状態での耐擦過性に優れ、色再現性と耐光性にも優れたインクジェット記録用シートを提供することを、その課題とするものである。
【0007】
【課題を解決するための手段】
上記課題を解決することを目的としてなされた本発明インクジェット記録用シートの構成は、基材の少なくとも片面にインク受理層を設けたインクジェット記録用シートにおいて、前記インク受理層が顔料成分としてシリカを含有すると共に、ガラス転移温度が10〜45℃のカチオン型アクリル樹脂を含むバインダー樹脂及び水溶性アルミニウム塩を含有し、且つ、水溶性アルミニウム塩が全インク受理層固形分の2〜10重量%であることを特徴とするものである。
【0008】
即ち、本発明の発明者は、上記課題を解決することを目的として鋭意研究の結果、インクジェット記録用シートにおいて、水溶性カチオン性有機物質を使用することなく、シリカ、水溶性アルミニウム塩、アクリル樹脂を適切に用いることにより、上記目的を達成できることを知得し、本発明を成し遂げたのである。
【0009】
而して、上記水溶性アルミニウム塩は、塩基性乳酸アルミニウム又は硫酸アルミニウム、硫酸アンモニウムアルミニウム、硫酸ナトリウムアルミニウムから選ばれる少なくとも1つであることが好ましい。
【0010
更に、顔料成分は、平均二次粒子径が3μm以上、且つ、比表面積が200m2/g以上のシリカが好ましい。顔料成分としてはシリカの他、アルミナゾルを含む構成にすれば、更に好ましい。
【0011
一方、インク受理層中の、バインダー樹脂を除いた残余の有機物中、カチオン性のものはインク受理層固形分の2重量%以下であることが好ましい。
【0012
【発明の実施の形態】
本発明インクジェット記録用シートにおける基材としては、紙又はプラスチックフィルムが使用されるが、紙としては、上質紙、中質紙、更紙、模造紙、アート紙、微塗工紙、薄葉紙、化学パルプ紙、ファンシーペーパー等が用いられ、また、プラスチックフィルムとして、ポリエチレンテレフタレート、ポリプロピレン、ポリスチレン、ポリカーボネート等の一般的な熱可塑性樹脂フィルム、或いは、炭酸カルシウム等の無機粉末を内添させたこれらの発泡フィルムや酸化チタンが内添された表面光沢性を有する白ポリエチレンテレフタレートフィルム等が用いられる。
【0013
また、顔料成分としては、インク吸収能力の面から、シリカを使用する。特に、平均二次粒子径が3.0μm以上、比表面積が200m2/g以上のものが好ましい。顔料成分の含有量としては、インク受理層の全固形分の40〜70重量%が好ましい。含有量が40重量%より少ない場合はインク吸収能力が不十分であり、また、70重量%を超えると塗工層の強度が低下しやすくなる。
【0014
顔料成分としては、水不溶性のもので、炭酸カルシウム、炭酸マグネシウム、珪藻土、タルク、酸化チタン、アルミナゾル等を含むことができる。特に、塗工層の耐水性を強化するためにアルミナゾルを加えるとより好ましい効果が得られる。含有量はバインダー樹脂固形分に対し、好ましくは、0.5〜30重量%、より好ましくは、1.0〜20重量%添加する。添加量が0.5重量%未満では十分な効果が得られず、30重量%を超えると、効果が飽和してそれ以上の改善は得られないばかりか、塗工層がカールしやすくなる。
【0015
バインダー樹脂には、アクリル樹脂を使用する。その理由は、耐水性の面から本発明インクジェット記録用シートに有効であるからであって、耐光性の面からアクリル樹脂が好ましい。このアクリル樹脂はノニオン型又はカチオン型のものがインク定着性の面から好ましく、水溶性アルミニウム塩を添加したときのゲル化防止の目的から、特にカチオン型が好ましい。また、低温、低湿度の環境下でのカールを防ぐために、ガラス転移点温度は10〜45℃が好ましい。なお、バインダー樹脂としては、アクリル樹脂以外の樹脂、例えば、ポリウレタン樹脂、ポリビニルアルコール、ポリビニルブチラール、ゼラチン、ポリビニルアセタール、カルボキシメチルセルロース、ポリビニルピロリドン、スチレン−アクリル共重合体、エチレン−酢酸ビニル共重合体、スチレン−ブタジエンゴム等を混合して使用することができる。
【0016
次に、水溶性アルミニウム塩は、カチオン性有機物と同じカチオン性であるが、添加しても耐水性をあまり低下させることなく、にじみ性,発色性を改善することができる。水溶性アルミニウム塩としては、塩化アルミニウム、硫酸アルミニウム、硝酸アルミニウム及びその類似物のようなアルミニウム塩であり、特に発色性の面から塩基性乳酸アルミニウム、硫酸アルミニウム、硫酸アンモニウムアルミニウム、硫酸ナトリウムアルミニウムが好適である。含有量としては、全受理層固形分の2〜10重量%、より好ましくは、4〜8重量%である。2重量%未満ではにじみ、発色性が不十分であり、10重量%を超えると効果が飽和する。
【0017
更に、塗工層の構成は、固形分重量で15〜55g/m2 、好ましくは、20〜40g/m2、乾燥温度は100〜130℃が好ましい。なお、密着性を向上させる目的で、基材にアンカー層を設けてもよい。また、インク受理層中のバインダー樹脂を除いた残余の有機物中、カチオン性のものをインク受理層固形分の2重量%以下とすることが好ましく、まったく含まないことが更に好ましい。インク受理層中のバインダー樹脂を除いた残余の有機物は印画部及び非印画部のぬれた状態での耐擦過性の面からまったく含まないことが好ましいが、インク受理層固形分の2重量%以下であれば耐擦過性の点でも実用上問題なく使用することができるからである。
【0018
次に、本発明の実施例と比較例について説明する。
実施例及び比較例における基材としては、厚さ80μmの合成紙(ユポFPG#80 王子油化合成紙社製)を用い、また、シリカとしては、下記の表1のものを使用した。
【0019
【表1】

Figure 0004315581
【0020
(実施例1)
〔組成1〕
アクリル系樹脂(アクロナールYJ−6221D
固形分49% BASFディスパージョン社製) 60g
水 26g
炭酸カルシウム 10g
基材の表面に、上記組成のアンカーコート処理を施した後、下記組成2の塗工液を塗布し、塗工厚35μmのインク受理層を形成した。
〔組成2〕
水 24g
非イオン界面活性剤(SNディフォーマー480 サンノプコ社製) 0.2g
アルミナゾル(アルミナゾル200 固形分10% 日産化学工業社製) 2g
蛍光増白剤(ブランコフォアBSU−PNリキッド バイエル社製) 0.2g
塩基性乳酸アルミニウム(タキセラムM‐160L
固形分10% 多木化学社製) 18g
カチオン型アクリル樹脂(NKポリマーAC−111
固形分36.3% 新中村化学社製) 41g
合成シリカ(ミズカシルP−78A 水沢化学社製) 10g
合成シリカ(ミズカシルP−50 水沢化学社製)
5g
【0021
(実施例2)
基材表面に、前記組成1のアンカーコート処理を施した後、下記組成3の塗工液を塗布し、塗工厚35μmのインク受理層を形成した。
〔組成3〕
水 24g
非イオン界面活性剤(SNディフォーマー480 サンノプコ社製) 0.2g
アルミナゾル(アルミナゾル200 固形分10% 日産化学工業社製) 2g
蛍光増白剤(ブランコフォアBSU−PNリキッド バイエル社製) 0.2g
硫酸ナトリウムアルミニウム 1.8g
カチオン型アクリル樹脂(NKポリマーAC−111
固形分36.3% 新中村化学社製) 41g
合成シリカ(ミズカシルP−78A 水沢化学社製) 10g
合成シリカ(ミズカシルP−50 水沢化学社製)
5g
【0022
(実施例3,4)
基材表面に、前記組成1のアンカーコート処理を施した後、前記組成3の硫酸ナトリウムアルミニウムを、硫酸アルミニウムに変えた組成4(実施例3用),硫酸アンモニウムアルミニウムに変えた組成5(実施例4用)の塗工液をそれぞれ塗布し、塗工厚35μmのインク受理層を形成した。
【0023
(比較例1 水溶性アルミニウム塩を含有しない)
基材に前記組成1のアンカーコート処理を施した後、下記組成6の塗工液を塗布し、塗工厚35μmのインク受理層を形成した。
〔組成6〕
水 24g
非イオン界面活性剤(SNディフォーマー480 サンノプコ社製) 0.2g
アルミナゾル(アルミナゾル200 固形分10% 日産化学工業社製) 2g
蛍光増白剤(ブランコフォアBSU−PNリキッド バイエル社製) 0.2g
カチオン型アクリル樹脂(NKポリマーAC−111
固形分36.3% 新中村化学社製) 41g
合成シリカ(ミズカシルP−78A 水沢化学社製) 10g
合成シリカ(ミズカシルP−50 水沢化学社製)
5g
【0024
(比較例2 水溶性アルミニウム塩の代わりにカチオン性有機物を含有)
基材表面に、前記組成1のアンカーコート処理を施した後、下記組成7の塗工液を塗布し、塗工厚35μmのインク受理層を形成した。
〔組成7〕
水 24g
非イオン界面活性剤(SNディフォーマー480 サンノプコ社製) 0.2g
アルミナゾル(アルミナゾル200 固形分10% 日産化学工業社製) 2g
蛍光増白剤(ブランコフォアBSU−PNリキッド バイエル社製) 0.2g
特殊変性ポリアミン(ポリフィックス700 固形分60%
昭和高分子社製) 7g
カチオン型アクリル樹脂(NKポリマーAC−111
固形分36.3% 新中村化学社製) 41g
合成シリカ(ミズカシルP−78A 水沢化学社製) 10g
合成シリカ(ミズカシルP−50 水沢化学社製)
5g
【0025
(比較例3 水溶性アルミニウム塩の代わりにカチオン性有機物を含有)
基材表面に、前記組成1のアンカーコート処理を施した後、下記組成8の塗工液を塗布し、塗工厚35μmのインク受理層を形成した。
〔組成8〕
水 24g
非イオン界面活性剤(SNディフォーマー480 サンノプコ社製) 0.2g
アルミナゾル(アルミナゾル200 固形分10% 日産化学工業社製) 2g
蛍光増白剤(ブランコフォアBSU−PNリキッド バイエル社製) 0.2g
ジシアンジアミド縮合物(ネオフィックスE−117
固形分50% 日華化学社製) 8g
カチオン型アクリル樹脂(NKポリマーAC−111
固形分36.3% 新中村化学社製) 41g
合成シリカ(ミズカシルP−78A 水沢化学社製) 10g
合成シリカ(ミズカシルP−50 水沢化学社製)
5g
【0026
(比較例4 カチオン型アクリル樹脂の代わりにPVAを用いた)
基材表面に、前記組成1のアンカーコート処理を施した後、下記組成9の塗工液を塗布し、塗工厚35μmのインク受理層を形成した。
〔組成9〕
ポリビニルアルコール(PVA R−1130 クラレ社製) 4.5g
非イオン界面活性剤(SNディフォーマー480 サンノプコ社製) 0.3g
アルミナゾル(アルミナゾル200 固形分10% 日産化学工業社製) 4.5g
蛍光増白剤(ブランコフォアBSU−PNリキッド バイエル社製)
0.3g
塩基性乳酸アルミニウム(タキセラムM‐160L 固形分10%
多木化学社製) 8.5g
合成シリカ(ミズカシルP−78A 水沢化学社製) 4.5g
【0027
上記の実施例及び比較例のインクジェット記録用シートについて、「白紙部擦り耐水性」、インクジェットプリンター(HEWLETT PACKARD社製 DesignJet2000CP顔料インク)を用いたときの「印画部擦り耐水性」、「発色性」、「にじみ」について、下記の基準により評価した。
【0028
白紙部擦り耐水性は、十分に濡れた綿棒で荷重が100gになるように白紙部を擦り、塗工層が脱離するまで擦る。(1往復−片道約50mm−を1回とカウント)とし、100回以上を○、51〜99回を△、50回以下を×とした。
印画部擦り耐水性は、十分に濡れた綿棒で荷重が50gになるように印画部を擦り、インク又は塗工層が脱離するまで擦る。(片道約50mm、片道を1回とカウント)とし、10回以上を○、9回以下6回までを△、5回以下を×とした。
また、発色性は、マクベス濃度計RD−918により、シアン、マゼンタ、イエロー、ブラック反射濃度を測定し、十分な反射濃度を得られた場合を○、やや反射濃度が低い場合を△、反射濃度が不十分な場合を×とした。
更に、にじみについては、目視により、にじみがない場合を○、ややにじんだ場合を△、激しくにじんだ場合を×とした。
【0029
上記の評価の結果は、表2に示すとおりであった。
【0030
【表2】
Figure 0004315581
【0031
上記表2から明らかなように、比較例1のように、水溶性アルミニウム塩を含有しない場合、発色性が極めて悪く、激しくにじむ。比較例2,3のように、水溶性アルミニウム塩の代わりにカチオン性有機物質であるポリアミン、ジシアンジアミド縮合物を含有させた場合、印画部擦り耐水性が低下する。また、比較例4のように、カチオン型アクリル樹脂の代わりにポリビニルアルコールを用いた場合、白紙部擦り耐水性が低い
【0032
上記の各比較例に対し、本発明の実施例1〜4のように、シリカ、アルミナゾルを含む顔料、カチオン型アクリル樹脂、水溶性アルミニウム塩を含み、且つ、水溶性アルミニウム塩を全インク受理層固形分の2〜10重量%含有させれば、極めて良好な結果を得ることができる。
【0033
【発明の効果】
本発明は上述のとおりであって、本発明インクジェット記録用シートは、画像ににじみが無く、発色性とインク定着性が良好であり、しかも、インク受理層の印画部と非印画部の耐水性及び濡れた状態での耐擦過性に優れ、色再現性、耐光性にも優れたもので、従来のインクジェット記録用シートに比し、その性能は著しく高度なものとなる。[0001]
BACKGROUND OF THE INVENTION
The present invention maintains color developability and ink fixability without causing bleeding, and is excellent in water resistance and scratch resistance when the ink receiving layer and the printed part are wet, and color reproducibility. The present invention relates to an ink jet recording sheet having excellent light resistance.
[0002]
[Prior art]
Various types of inkjet recording sheets have been proposed and put into practical use. That is, since the ink for recording on the recording material of the ink jet recording sheet is anionic, in order to improve the ink bleeding property, color developing property, and ink fixing property, for example, JP-A-62-268682. As disclosed in the official gazette, a recording material contains a cationic organic substance, and in particular, a quaternary ammonium salt, a dicyandiamide type, a polyamine type, an alkylamine type water-soluble cationic organic substance is used. Very often included.
[0003]
However, when the above water-soluble cationic organic substance is added to the recording material, not only does the water resistance of the coating layer itself and the scratch resistance in a wet state decrease, but also the water resistance and wettability of the printed portion. In addition, the scratch resistance in a wet state is reduced, and color reproducibility and light resistance are also adversely affected.
[0004]
Usually, polyvinyl alcohol is used in combination as the binder resin of the ink receiving layer, but the ink receiving layer using the polyvinyl resin alone or a binder resin containing the polyvinyl alcohol as a main component is not sufficiently water resistant. When the cationic organic substance is contained, the water resistance is remarkably lowered.
[0005]
Therefore, compared with the case where a water-soluble cationic organic substance is added to the ink receiving layer, the ink bleeding property, color developing property, and ink fixing property are not deteriorated, and the water resistance of the coating layer itself and the printed portion is reduced. In addition, development of an ink jet recording sheet excellent in scratch resistance, color reproducibility and light resistance in a wet state has been desired, but a satisfactory one has not yet been realized.
[0006]
[Problems to be solved by the invention]
In view of the prior art as described above, the present invention maintains the color developability and the ink fixing property without causing blurring of the image, and further, the ink receiving layer and the print portion are water resistant and resistant to being wet. An object of the present invention is to provide an ink jet recording sheet having excellent scratch resistance and excellent color reproducibility and light resistance.
[0007]
[Means for Solving the Problems]
The composition of the inkjet recording sheet of the present invention made for the purpose of solving the above problems is an inkjet recording sheet in which an ink receiving layer is provided on at least one side of a base material, wherein the ink receiving layer contains silica as a pigment component. while, the glass transition temperature of 10 to 45 ° C. cationic a acrylic resin contained including binder resin and a water-soluble aluminum salts, and 2 to 10 wt% of water-soluble aluminum salt is the total ink receiving layer solids It is characterized by being.
[0008]
That is, the inventor of the present invention, as a result of diligent research aimed at solving the above-mentioned problems, in the ink jet recording sheet, without using a water-soluble cationic organic substance, silica, water-soluble aluminum salt, acrylic resin It was learned that the above-mentioned object can be achieved by appropriately using, and the present invention has been accomplished.
[0009]
Thus, the water-soluble aluminum salt is preferably at least one selected from basic aluminum lactate or aluminum sulfate, ammonium aluminum sulfate, and sodium aluminum sulfate.
[00 10 ]
Further, the pigment component is preferably silica having an average secondary particle diameter of 3 μm or more and a specific surface area of 200 m 2 / g or more. It is more preferable that the pigment component includes alumina sol in addition to silica.
[00 11 ]
On the other hand, in the remaining organic matter excluding the binder resin in the ink receiving layer, the cationic one is preferably 2% by weight or less of the solid content of the ink receiving layer.
[00 12 ]
DETAILED DESCRIPTION OF THE INVENTION
As the substrate in the inkjet recording sheet of the present invention, paper or plastic film is used, and as the paper, high-quality paper, medium-quality paper, reprinted paper, imitation paper, art paper, fine coated paper, thin paper, chemical Pulp paper, fancy paper, etc. are used. Also, as a plastic film, general thermoplastic resin films such as polyethylene terephthalate, polypropylene, polystyrene, polycarbonate, etc., or foams in which inorganic powder such as calcium carbonate is internally added. A white polyethylene terephthalate film having surface gloss with a film or titanium oxide added therein is used.
[00 13 ]
As the pigment component, silica is used from the viewpoint of ink absorption capability. In particular, those having an average secondary particle diameter of 3.0 μm or more and a specific surface area of 200 m 2 / g or more are preferred. The content of the pigment component is preferably 40 to 70% by weight of the total solid content of the ink receiving layer. If the content is less than 40% by weight, the ink absorption capacity is insufficient, and if it exceeds 70% by weight, the strength of the coating layer tends to decrease.
[00 14 ]
The pigment component is water-insoluble and may include calcium carbonate, magnesium carbonate, diatomaceous earth, talc, titanium oxide, alumina sol, and the like. In particular, when alumina sol is added to enhance the water resistance of the coating layer, a more preferable effect can be obtained. The content is preferably 0.5 to 30% by weight, more preferably 1.0 to 20% by weight, based on the solid content of the binder resin. If the addition amount is less than 0.5% by weight, a sufficient effect cannot be obtained, and if it exceeds 30% by weight, the effect is saturated and no further improvement can be obtained, and the coating layer is easily curled.
[00 15 ]
An acrylic resin is used for the binder resin. The reason is that it is effective for the ink jet recording sheet of the present invention from the viewpoint of water resistance, and acrylic resin is also preferable from the viewpoint of light resistance. Preferably from the viewpoint of ink fixability those of the acrylic resins are nonionic or cationic, for the purpose of prevention of gelation upon addition of water-soluble aluminum salts, in particular cationic are preferred. In order to prevent curling in a low temperature and low humidity environment, the glass transition temperature is preferably 10 to 45 ° C. As the binder resin, a resin other than acrylic resins, for example, polyurethane resins, polyvinyl alcohol, polyvinyl butyral, gelatin, polyvinyl acetal, carboxymethylcellulose, polyvinyl pyrrolidone, styrene - acrylic copolymer, ethylene - vinyl acetate copolymer Further, styrene-butadiene rubber or the like can be mixed and used.
[00 16 ]
Next, the water-soluble aluminum salt is the same cationic as the cationic organic substance, but even when added, it can improve the bleeding property and color developability without significantly reducing the water resistance. Examples of the water-soluble aluminum salt include aluminum salts such as aluminum chloride, aluminum sulfate, aluminum nitrate and the like, and basic aluminum lactate, aluminum sulfate, ammonium aluminum sulfate and sodium aluminum sulfate are particularly preferable in terms of color development. is there. The content is 2 to 10% by weight, more preferably 4 to 8% by weight, based on the total solid content of the receiving layer. If the amount is less than 2% by weight, the ink bleeds and the color developability is insufficient. If the amount exceeds 10% by weight, the effect is saturated.
[00 17 ]
Furthermore, the structure of the coating layer, 15~55g / m 2 in solid weight, preferably, 20 to 40 g / m 2, the drying temperature is preferably from 100 to 130 ° C.. In addition, you may provide an anchor layer in a base material in order to improve adhesiveness. In addition, it is preferable that the remaining organic substances excluding the binder resin in the ink receiving layer contain a cationic one in an amount of 2% by weight or less based on the solid content of the ink receiving layer, and more preferably not contain it at all. The remaining organic matter excluding the binder resin in the ink receiving layer is preferably not contained at all from the aspect of scratch resistance in the wet state of the printed part and the non-printed part, but 2% by weight or less of the solid content of the ink receiving layer This is because it can be used practically without problems in terms of scratch resistance.
[00 18 ]
Next, examples and comparative examples of the present invention will be described.
As a base material in Examples and Comparative Examples, a synthetic paper having a thickness of 80 μm (Yupo FPG # 80 manufactured by Oji Oil Chemical Co., Ltd.) was used, and the silica shown in Table 1 was used.
[00 19 ]
[Table 1]
Figure 0004315581
[00 20 ]
Example 1
[Composition 1]
Acrylic resin (Acronal YJ-6221D
Solid content 49% BASF Dispersion) 60g
26g of water
Calcium carbonate 10g
After subjecting the surface of the base material to an anchor coating treatment having the above composition, a coating liquid having the following composition 2 was applied to form an ink receiving layer having a coating thickness of 35 μm.
[Composition 2]
24g of water
Nonionic surfactant (SN deformer 480, manufactured by San Nopco) 0.2g
Alumina sol (Alumina sol 200 solid content 10%, manufactured by Nissan Chemical Industries) 2g
Optical brightener (Brancophore BSU-PN Liquid Bayer) 0.2g
Basic aluminum lactate (Taxelum M-160L
Solid content 10% Taki Chemical Co., Ltd.) 18g
Cationic acrylic resin (NK polymer AC-111
Solid content 36.3% Shin-Nakamura Chemical Co., Ltd.) 41g
Synthetic silica (Mizukasil P-78A made by Mizusawa Chemical) 10g
Synthetic silica (Mizukasil P-50 made by Mizusawa Chemical)
5g
[00 21 ]
(Example 2)
After subjecting the substrate surface to the anchor coating treatment of the above composition 1, a coating liquid of the following composition 3 was applied to form an ink receiving layer having a coating thickness of 35 μm.
[Composition 3]
24g of water
Nonionic surfactant (SN deformer 480 manufactured by San Nopco) 0.2g
Alumina sol (Alumina sol 200 solid content 10%, manufactured by Nissan Chemical Industries) 2g
Optical brightener (Brancophore BSU-PN Liquid Bayer) 0.2g
Sodium aluminum sulfate 1.8g
Cationic acrylic resin (NK polymer AC-111
Solid content 36.3% Shin-Nakamura Chemical Co., Ltd.) 41g
Synthetic silica (Mizukasil P-78A made by Mizusawa Chemical) 10g
Synthetic silica (Mizukasil P-50 made by Mizusawa Chemical)
5g
[00 22 ]
(Examples 3 and 4)
After subjecting the substrate surface to the anchor coating treatment of the composition 1, the composition 4 (for Example 3) in which the sodium aluminum sulfate of the composition 3 was changed to aluminum sulfate, and the composition 5 (Example in which the aluminum sulfate was changed to aluminum sulfate) 4) was applied to form an ink receiving layer having a coating thickness of 35 μm.
[00 23 ]
(Comparative Example 1 does not contain a water-soluble aluminum salt)
After subjecting the substrate to the anchor coating treatment of the above composition 1, a coating liquid of the following composition 6 was applied to form an ink receiving layer having a coating thickness of 35 μm.
[Composition 6]
24g of water
Nonionic surfactant (SN deformer 480 manufactured by San Nopco) 0.2g
Alumina sol (Alumina sol 200 solid content 10%, manufactured by Nissan Chemical Industries) 2g
Optical brightener (Brancophore BSU-PN Liquid Bayer) 0.2g
Cationic acrylic resin (NK polymer AC-111
Solid content 36.3% Shin-Nakamura Chemical Co., Ltd.) 41g
Synthetic silica (Mizukasil P-78A made by Mizusawa Chemical) 10g
Synthetic silica (Mizukasil P-50 made by Mizusawa Chemical)
5g
[00 24 ]
(Comparative Example 2 contains cationic organic substance instead of water-soluble aluminum salt)
After subjecting the substrate surface to the anchor coating treatment of the composition 1, a coating liquid of the following composition 7 was applied to form an ink receiving layer having a coating thickness of 35 μm.
[Composition 7]
24g of water
Nonionic surfactant (SN deformer 480 manufactured by San Nopco) 0.2g
Alumina sol (Alumina sol 200 solid content 10%, manufactured by Nissan Chemical Industries) 2g
Optical brightener (Brancophore BSU-PN Liquid Bayer) 0.2g
Specially modified polyamine (Polyfix 700, solid content 60%
7g made by Showa Polymer Co., Ltd.
Cationic acrylic resin (NK polymer AC-111
Solid content 36.3% Shin-Nakamura Chemical Co., Ltd.) 41g
Synthetic silica (Mizukasil P-78A made by Mizusawa Chemical) 10g
Synthetic silica (Mizukasil P-50 made by Mizusawa Chemical)
5g
[00 25 ]
(Comparative Example 3 contains cationic organic substance instead of water-soluble aluminum salt)
After subjecting the substrate surface to the anchor coating treatment of the composition 1, a coating liquid of the following composition 8 was applied to form an ink receiving layer having a coating thickness of 35 μm.
[Composition 8]
24g of water
Nonionic surfactant (SN deformer 480 manufactured by San Nopco) 0.2g
Alumina sol (Alumina sol 200 solid content 10%, manufactured by Nissan Chemical Industries) 2g
Optical brightener (Brancophore BSU-PN Liquid Bayer) 0.2g
Dicyandiamide condensate (Neofix E-117
Solid content 50% Nikka Chemical Co., Ltd.) 8g
Cationic acrylic resin (NK polymer AC-111
Solid content 36.3% Shin-Nakamura Chemical Co., Ltd.) 41g
Synthetic silica (Mizukasil P-78A made by Mizusawa Chemical) 10g
Synthetic silica (Mizukasil P-50 made by Mizusawa Chemical)
5g
[00 26 ]
(Comparative Example 4 PVA was used in place of the cationic acrylic resin)
After subjecting the substrate surface to the anchor coating treatment of the composition 1, a coating liquid of the following composition 9 was applied to form an ink receiving layer having a coating thickness of 35 μm.
[Composition 9]
Polyvinyl alcohol (PVA R-1130 Kuraray Co., Ltd.) 4.5g
Nonionic surfactant (SN deformer 480 manufactured by San Nopco) 0.3g
Alumina sol (Alumina sol 200 solid content 10%, manufactured by Nissan Chemical Industries) 4.5g
Fluorescent whitening agent (Brancophore BSU-PN Liquid Bayer)
0.3g
Basic aluminum lactate (Taxelum M-160L solid content 10%
8.5g made by Taki Chemical Co., Ltd.
Synthetic silica (Mizukasil P-78A made by Mizusawa Chemical) 4.5g
[00 27 ]
About the ink jet recording sheets of the above examples and comparative examples, “white paper part rubbing water resistance”, “print part rubbing water resistance” when using an ink jet printer (DesignJet2000CP pigment ink manufactured by HEWLETT PACKARD), “color development” The “smudge” was evaluated according to the following criteria.
[00 28 ]
For the water resistance of rubbing the white paper portion, the white paper portion is rubbed with a sufficiently wet cotton swab so that the load is 100 g and rubbed until the coating layer is detached. (One reciprocation—about 50 mm on one way is counted as one time), 100 or more times were marked with ◯, 51 to 99 times were marked with Δ, and 50 times or less were marked with ×.
The water resistance of rubbing the printed part is rubbed with a sufficiently wet cotton swab so that the load is 50 g and rubbed until the ink or coating layer is detached. (Approximately 50 mm for one way, count one time for one way), 10 times or more for ◯, 9 times or less up to 6 times, △, 5 times or less for x.
The color developability was measured with a Macbeth densitometer RD-918. The reflection density was measured with cyan, magenta, yellow, and black. Is insufficient.
Further, with respect to the blur, the case where there was no blur was visually evaluated as ◯, the case where the blur was slightly blurred, and the case where the blur was severely marked as X.
[00 29 ]
The results of the above evaluation were as shown in Table 2.
[00 30 ]
[Table 2]
Figure 0004315581
[00 31 ]
As is clear from Table 2 above, when no water-soluble aluminum salt is contained as in Comparative Example 1, the color developability is extremely poor and blurs vigorously. As in Comparative Examples 2 and 3, when a polyamine or dicyandiamide condensate, which is a cationic organic substance, is contained in place of the water-soluble aluminum salt, the water resistance of rubbing on the print area is lowered. Further, as in Comparative Example 4, when polyvinyl alcohol is used in place of the cationic acrylic resin, the white paper portion scuffing water resistance is low .
[00 32 ]
For each of the above comparative examples, as in Examples 1-4 of the present invention, silica, a pigment containing an alumina sol, a cationic acrylic resin, a water-soluble aluminum salt, and a water-soluble aluminum salt as a whole ink receiving layer When 2 to 10% by weight of the solid content is contained, extremely good results can be obtained.
[00 33 ]
【The invention's effect】
The present invention is as described above, and the ink jet recording sheet of the present invention has no image blur, good color developability and ink fixability, and water resistance of the printed portion and the non-printed portion of the ink receiving layer. In addition, it has excellent scratch resistance in a wet state, excellent color reproducibility, and light resistance, and its performance is remarkably high as compared with a conventional ink jet recording sheet.

Claims (5)

基材の少なくとも片面にインク受理層を設けたインクジェット記録用シートにおいて、前記インク受理層が顔料成分としてシリカを含有すると共に、ガラス転移温度が10〜45℃のカチオン型アクリル樹脂を含むバインダー樹脂及び水溶性アルミニウム塩を含有し、且つ、水溶性アルミニウム塩が全インク受理層固形分の2〜10重量%であることを特徴とするインクジェット記録用シート。In the ink-jet recording sheet provided with a least ink-receiving layer on one side of the substrate, together with the ink-receiving layer contains silica as the pigment component, the glass transition temperature of 10 to 45 ° C. cationic A acrylic resin including a binder A sheet for ink-jet recording comprising a resin and a water-soluble aluminum salt, wherein the water-soluble aluminum salt is 2 to 10% by weight of the total solid content of the ink receiving layer. 水溶性アルミニウム塩は、塩基性乳酸アルミニウム又は硫酸アルミニウム、硫酸アンモニウムアルミニウム、硫酸ナトリウムアルミニウムから選ばれる少なくとも1つである請求項1のインクジェット記録用シート。  The ink-jet recording sheet according to claim 1, wherein the water-soluble aluminum salt is at least one selected from basic aluminum lactate or aluminum sulfate, ammonium aluminum sulfate, and sodium aluminum sulfate. シリカは、平均二次粒子径が3μm以上、且つ、比表面積が200m/g以上のものである請求項1又は2のインクジェット記録用シート。 3. The ink jet recording sheet according to claim 1, wherein the silica has an average secondary particle diameter of 3 [mu] m or more and a specific surface area of 200 m < 2 > / g or more. 顔料成分としてアルミナゾルを含む請求項1〜のいずれかのインクジェット記録用シート。The inkjet recording sheet according to any one of claims 1 to 3 , comprising alumina sol as a pigment component. インク受理層中のバインダー樹脂を除いた残余の有機物中、カチオン性のものはインク受理層固形分の2重量%以下である請求項1〜のいずれかのインクジェット記録用シート。The ink jet recording sheet according to any one of claims 1 to 4 , wherein the remaining organic matter excluding the binder resin in the ink receiving layer has a cationic content of 2% by weight or less based on the solid content of the ink receiving layer.
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