JP2008246963A - Inkjet recording material - Google Patents

Inkjet recording material Download PDF

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JP2008246963A
JP2008246963A JP2007093657A JP2007093657A JP2008246963A JP 2008246963 A JP2008246963 A JP 2008246963A JP 2007093657 A JP2007093657 A JP 2007093657A JP 2007093657 A JP2007093657 A JP 2007093657A JP 2008246963 A JP2008246963 A JP 2008246963A
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ink
recording material
polyurethane resin
receiving layer
silica
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JP4536081B2 (en
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Naomasa Koike
直正 小池
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Mitsubishi Paper Mills Ltd
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Mitsubishi Paper Mills Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide inkjet recording material having good coloring concentration ink quick dryable property, scratch resistance and water resistance of a recording part, in recording particularly using solvent ink. <P>SOLUTION: In the inkjet recording material in which an ink acceptance layer is formed, the ink acceptance layer contains polyurethane resin made from polyetherpolyol as raw material and silica, wherein the mass ratio of the polyurethane resin to the silica is 95:5 to 50:50, and the tensile strength of the polyurethane resin defined in JIS K 7311 is 30 to 70 MPa, and the elongation is 300 to 700%. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、インクジェット記録材料、特に溶剤系インクを用いた記録に対し良好な発色濃度、インク速乾性、記録部の耐スクラッチ性及び耐水性を有するインクジェット記録材料に関する。   The present invention relates to an ink jet recording material, particularly an ink jet recording material having good color density, quick ink drying, scratch resistance and water resistance for recording using a solvent-based ink.

近年、インクジェットプリンタの技術が急速に進歩し、一般的な銀塩写真法によるものと同等以上の画像品質を有する記録物が得られるようになってきた。これに伴い、インクジェット記録材料にも、銀塩写真法に用いられるものと同等の質感を有するものが求められている。このような要求を満たすインクジェット記録材料として、紙やプラスチックフィルム等の基材上に、多孔質のインク吸収層を設けた記録材料が用いられている。   In recent years, the technology of inkjet printers has advanced rapidly, and it has become possible to obtain recorded matter having image quality equivalent to or higher than that obtained by a general silver salt photography method. Accordingly, ink jet recording materials having a texture equivalent to that used in silver salt photography are required. As an ink jet recording material that satisfies such requirements, a recording material in which a porous ink absorbing layer is provided on a substrate such as paper or a plastic film is used.

また一方、溶剤インクを用いた大型インクジェットプリンタ(以下、溶剤インクプリンタという。)も登場してきており、塩化ビニルフィルムやターポリン等のポリマーフィルムシートに記録されたものが耐水性、耐候性が必要となる看板や垂れ幕広告等の屋外表示材料として使用されてきている。溶剤インクは色材顔料を有機溶剤に分散させたものである。当初は記録後の乾燥時間短縮と塩化ビニル記録材料との固着性を確保するために、沸点が低く溶解力の高い溶媒が使用されていたが、環境負荷が高いことから溶媒成分の見直しが進められ、近年では臭気や皮膚刺激が非常に少なく、環境負荷も抑えられた溶剤インクが導入され溶剤インクプリンタが使われる範囲が広がってきている。
このような中、紙支持体を用いた記録材料が溶剤インクプリンタで記録される様になってきている。これは塩化ビニルフィルムの環境負荷が大きいことから、これを避ける動きがあることが理由であると考えられる。
On the other hand, large-scale inkjet printers using solvent ink (hereinafter referred to as solvent ink printers) have also appeared, and those recorded on polymer film sheets such as vinyl chloride films and tarpaulins need water resistance and weather resistance. It has been used as an outdoor display material for billboards and banner advertisements. The solvent ink is obtained by dispersing a colorant pigment in an organic solvent. Initially, a solvent with a low boiling point and high solubility was used to shorten the drying time after recording and to secure the adhesion to the vinyl chloride recording material. In recent years, the use of solvent ink printers has been expanded with the introduction of solvent inks that have very little odor and skin irritation and reduced environmental impact.
Under such circumstances, a recording material using a paper support is being recorded by a solvent ink printer. This is considered to be because there is a movement to avoid this because the environmental load of the vinyl chloride film is large.

紙支持体を用いた溶剤インクプリンタで記録できる記録材料としては、支持体上にポリウレタン樹脂を含むインク受容層を設けた記録材料が検討されている。分子中にポリカーボネート鎖及び/又はポリエステル鎖を有するポリウレタン樹脂を含んだインク受容層が提案されており(例えば、特許文献1参照)、また、ポリカーボネート系ポリウレタン樹脂及びポリエーテル系ポリウレタン樹脂の2種を含んでなるインク受容層が提案されている(例えば、特許文献2参照)。
しかしながら、特許文献1記載の発明では溶剤インクプリンタで記録した際のインクが乾くまでの時間が非常に長く(以降、インク速乾性という)ハンドリングしにくい欠点があり、また溶剤インクの溶剤が蒸散した後に塗層にクラックが生じ記録品質を著しく低下させることがある。また特許文献2記載の発明では速乾性は確保できるものの、インクが付着した箇所を乾燥後に擦った場合にインクが塗層から欠落してしまう事(以降、耐スクラッチ性という)があった。
特開2003−025723号公報 特開2006−247963号公報
As a recording material that can be recorded by a solvent ink printer using a paper support, a recording material in which an ink receiving layer containing a polyurethane resin is provided on a support has been studied. An ink receiving layer containing a polyurethane resin having a polycarbonate chain and / or a polyester chain in the molecule has been proposed (see, for example, Patent Document 1), and two types of polycarbonate-based polyurethane resin and polyether-based polyurethane resin are used. An ink receiving layer comprising the same has been proposed (see, for example, Patent Document 2).
However, in the invention described in Patent Document 1, there is a disadvantage that it takes a very long time until the ink dries when recording with a solvent ink printer (hereinafter referred to as ink quick-drying), and the solvent of the solvent ink has evaporated. Later, the coating layer may crack and the recording quality may be significantly reduced. In addition, in the invention described in Patent Document 2, although quick drying property can be secured, there is a case where ink is missing from the coating layer (hereinafter referred to as scratch resistance) when the portion where the ink is adhered is rubbed after drying.
JP 2003-025723 A JP 2006-247963 A

本発明の目的は、溶剤系インクを用いた記録に対し良好な発色濃度、インク速乾性、記録部の耐スクラッチ性及び耐水性を有するインクジェット記録材料を提供することにある。   SUMMARY OF THE INVENTION An object of the present invention is to provide an ink jet recording material having good color density, ink quick drying, scratch resistance and water resistance for recording using a solvent-based ink.

本発明者は、上記課題を解決するために鋭意検討を行い、インク受容層に特定の組成、特性を有するポリウレタン樹脂を含有し、かつシリカを一定比率混合することにより上記課題を解決でき、溶剤系インクを用いた記録に対し良好な発色濃度、インク速乾性、記録部の耐スクラッチ性及び耐水性を有するインクジェット記録材料を得る事ができた。   The present inventor has intensively studied to solve the above problems, and can contain the polyurethane resin having a specific composition and characteristics in the ink receiving layer, and can solve the above problems by mixing silica at a certain ratio, It was possible to obtain an ink jet recording material having good color density, quick ink drying property, scratch resistance of recording portion and water resistance with respect to recording using a system ink.

本発明は紙を支持体とし、インク受容層が形成されているインクジェット記録材料であり、該インク受容層に、ポリエーテルポリオールを原料としてなるポリウレタン樹脂とシリカを含有し、ポリウレタン樹脂とシリカの質量比が95:5〜50:50であり、かつ該ポリウレタン樹脂の、JIS K 7311に規定される引張り強さが30〜70MPa、伸びが300〜700%であるものである。   The present invention is an ink jet recording material in which an ink receiving layer is formed using paper as a support, and the ink receiving layer contains a polyurethane resin and silica using polyether polyol as raw materials, and the mass of the polyurethane resin and silica. The ratio is 95: 5 to 50:50, and the polyurethane resin has a tensile strength specified in JIS K 7311 of 30 to 70 MPa and an elongation of 300 to 700%.

さらに本発明において、該インク受容層の乾燥後の塗抹量を5〜15g/m2に設定することにより、更に良好な耐水性を得ることができる。 Further, in the present invention, by setting the smear amount after drying of the ink receiving layer to 5 to 15 g / m 2 , further excellent water resistance can be obtained.

本発明により、溶剤系インクを用いた記録に対し、従来得られなかった良好な発色濃度、インク速乾性、記録部の耐スクラッチ性及び耐水性を有するインクジェット記録材料が得られるようになった。   According to the present invention, an ink jet recording material having good color density, quick ink drying, scratch resistance of recording portion and water resistance, which has not been obtained conventionally, can be obtained for recording using solvent-based ink.

本発明のインクジェット記録材料について説明する。本発明では紙を支持体として使用するが、構成するパルプは特に限定されず、針葉樹、広葉樹を原料としたクラフトパルプ、亜硫酸パルプ等の化学パルプ、砕木パルプ等の機械パルプ、セミケミカルパルプ、ケミグラウンドパルプ等の半化学パルプの他、バガス、ケナフ、ワラ等の非木材繊維を原料にした各種パルプ、古紙パルプ等を必要に応じて単独または適宜混合して用いる事ができる。   The ink jet recording material of the present invention will be described. In the present invention, paper is used as a support, but the constituent pulp is not particularly limited, and chemical pulp such as kraft pulp, sulfite pulp, etc. made from softwood and hardwood, mechanical pulp such as groundwood pulp, semi-chemical pulp, chemi In addition to semi-chemical pulps such as ground pulp, various pulps made from non-wood fibers such as bagasse, kenaf, and straw, waste paper pulp, and the like can be used alone or in combination as needed.

本発明に用いる紙支持体には、填料を含有せしめることが可能であり、その種類は特に限定されない。すなわち、軽質炭酸カルシウム、重質炭酸カルシウム、タルク、カオリン、硫酸カルシウム、硫酸バリウム、酸化チタン等の無機顔料や、中実、中空の各種有機白色顔料等を必要に応じて単独でまたは適宜混合して用いることができる。填料の含有量がある程度高いと、インク吸収性が高くなることから好ましいが、含有量が高すぎると、支持体の機械的強度が低下することがある。具体的には、本発明の支持体として用いられる紙の填料含有量は、4〜25質量%の範囲にあることが好ましい。   The paper support used in the present invention can contain a filler, and the type thereof is not particularly limited. That is, inorganic calcium pigments such as light calcium carbonate, heavy calcium carbonate, talc, kaolin, calcium sulfate, barium sulfate, and titanium oxide, and various solid and hollow organic white pigments may be used alone or appropriately mixed as necessary. Can be used. When the content of the filler is high to some extent, it is preferable because the ink absorbability becomes high. However, when the content is too high, the mechanical strength of the support may be lowered. Specifically, the filler content of the paper used as the support of the present invention is preferably in the range of 4 to 25% by mass.

本発明に用いる紙支持体には、前記のパルプと填料以外にも、必要に応じてバインダーやサイズ剤、定着剤、歩留まり向上剤、カチオン化剤、紙力増強剤、色目調整剤、蛍光増白剤、pH調整剤、消泡剤、ピッチコントロール剤、スライムコントロール剤などの各種抄紙用薬剤を適宜使用することもできる。これらの原材料を水中に適宜分散、溶解し、長網抄紙機やギャップフォーマー、ハイブリッドフォーマーなどのツインワイヤー抄紙機、円網抄紙機、コンビ型抄紙機などの各種製紙装置を使用することで、本発明の支持体として用いる紙を製造することができる。   In addition to the pulp and filler described above, the paper support used in the present invention includes a binder, a sizing agent, a fixing agent, a yield improver, a cationizing agent, a paper strength enhancer, a color adjuster, a fluorescence enhancer as necessary. Various paper making agents such as a whitening agent, a pH adjusting agent, an antifoaming agent, a pitch control agent, and a slime control agent can also be appropriately used. By appropriately dispersing and dissolving these raw materials in water, various paper machines such as twin-wire paper machines such as long paper machines, gap formers, and hybrid formers, circular paper machines, and combination-type paper machines can be used. The paper used as the support of the present invention can be produced.

また本発明に用いる紙支持体には、各種のデンプン、各種の表面サイズ剤等からなる表面サイズ処理を施すことも可能である。   The paper support used in the present invention can be subjected to surface sizing treatment comprising various starches, various surface sizing agents and the like.

本発明におけるインク受容層ではポリエーテルポリオールを原料としてなるポリウレタン樹脂を用いる。ポリウレタン樹脂では2個以上のイソシアネート機を有する化合物と活性水素基を有する化合物を重付加させて得られる重合体を言うが、本発明で使用するポリウレタン樹脂では、活性水素基を有する化合物としてポリエーテルポリオールを用いるものである。   In the ink receiving layer in the present invention, a polyurethane resin using polyether polyol as a raw material is used. Polyurethane resin refers to a polymer obtained by polyaddition of a compound having two or more isocyanate units and a compound having an active hydrogen group. In the polyurethane resin used in the present invention, polyether is used as the compound having an active hydrogen group. A polyol is used.

本発明で用いるポリウレタン樹脂の原料であるポリエーテルポリオールとしては、エチレンオキサイド、プロピレンオキサイド、ブチレンオキサイド、テトラヒドロフラン、スチレンオキサイド等の環状エーテルの1種または2種以上を、適切な触媒を用いて開環重合させる等して得られる重合体を用いることができる。これらはその1種を単独で用いてもよいし、2種以上を組み合わせて用いてもよい。   As the polyether polyol which is a raw material of the polyurethane resin used in the present invention, one or more cyclic ethers such as ethylene oxide, propylene oxide, butylene oxide, tetrahydrofuran and styrene oxide are opened using an appropriate catalyst. A polymer obtained by polymerization or the like can be used. These may be used individually by 1 type, and may be used in combination of 2 or more type.

本発明においては、ポリエーテルポリオールを原料としてなるポリウレタン樹脂の中でも、引張り強さが30〜70MPa、伸びが300〜700%のポリウレタン樹脂からなるラテックスを用いることで、良好な記録部の耐スクラッチ性及び耐水性を得ることができる。引張り強さが30MPaまたは、伸びが300%未満の場合は、記録部の耐スクラッチや耐水性が不十分となることがあり、また、引張り強さが70MPaまたは、伸びが700%を越える場合は、インク速乾性が不十分となるので好ましくない。   In the present invention, among the polyurethane resins using polyether polyol as a raw material, the scratch resistance of a good recording portion is obtained by using a latex made of a polyurethane resin having a tensile strength of 30 to 70 MPa and an elongation of 300 to 700%. And water resistance can be obtained. When the tensile strength is 30 MPa or the elongation is less than 300%, the scratch resistance and water resistance of the recording portion may be insufficient, and when the tensile strength is 70 MPa or the elongation exceeds 700%. This is not preferable because the ink quick drying property becomes insufficient.

また本発明のインク受容層ではポリウレタン樹脂と共にシリカを含有し、ポリウレタン樹脂とシリカの質量比が95:5〜50:50である範囲で用いる。シリカを含有することにより良好なインク速乾性を得ることができるが、ポリウレタン樹脂とシリカの質量比が95:5よりもポリウレタン樹脂の比率が高いと良好なインク速乾性が得られず、また質量比が50:50よりもポリウレタン樹脂の比率が低い場合はインク速乾性は良好なものの良好な発色性が得られなかったり、良好な耐水性が得られず、上記質量比の範囲でポリウレタン樹脂とシリカを含有する必要がある。   The ink receiving layer of the present invention contains silica together with the polyurethane resin, and is used in a range where the mass ratio of the polyurethane resin to silica is 95: 5 to 50:50. By including silica, good ink quick-drying property can be obtained, but when the mass ratio of polyurethane resin to silica is higher than 95: 5, good ink quick-drying property cannot be obtained, and mass When the ratio of the polyurethane resin is lower than 50:50, the ink quick drying property is good, but good color developability cannot be obtained, and good water resistance cannot be obtained. It is necessary to contain silica.

本発明で用いられるシリカとしてはゲル法シリカ、沈降法シリカ、コロイダルシルカ及び気相法シリカ等を例示することができ、これらの中の複数の種類を組み合わせて使用することができる。分散した粒子径としては0.1μm以上、10μm以下の範囲の物がインク速乾性の面で好適である。   Examples of the silica used in the present invention include gel method silica, precipitation method silica, colloidal silica, and gas phase method silica, and a plurality of these can be used in combination. A dispersed particle size in the range of 0.1 μm or more and 10 μm or less is suitable in terms of ink quick drying.

本発明で使用するインク受容層の乾燥後の塗抹量としては5〜15g/m2であることが好ましい。塗抹量が5g/m2よりも少ない場合は塗層が紙支持体上に均一な厚みで塗抹できず発色濃度や耐水性が十分に得られなかったりする場合がある。また塗抹量が15g/m2を越える場合ではポリウレタン樹脂の製膜が進みすぎインク速乾性が損なわれたり、生産コストの面で不利になる場合がある。
本発明のインク受容層には、必要に応じて、界面活性剤、消泡剤、増粘剤、色味調整剤、蛍光増白剤、酸化防止剤、紫外線吸収剤など各種の添加剤を添加することもできる。
The smear amount after drying of the ink receiving layer used in the present invention is preferably 5 to 15 g / m 2 . When the smear amount is less than 5 g / m 2, the coating layer may not be smeared on the paper support with a uniform thickness, and the color density and water resistance may not be sufficiently obtained. On the other hand, when the amount of smear exceeds 15 g / m 2 , the polyurethane resin film is formed too much, and the ink quick drying property may be impaired, or the production cost may be disadvantageous.
Various additives such as a surfactant, an antifoaming agent, a thickening agent, a color adjusting agent, a fluorescent whitening agent, an antioxidant, and an ultraviolet absorber are added to the ink receiving layer of the present invention as necessary. You can also

本発明のインク受容層は、例えば紙支持体上にインク受容層を構成する塗工液を塗工し、乾燥する事で設置することができる。塗工方法としては特に制限はなく、エアナイフコーター、ブレードコーター、ロッドブレードコーター、バーコーター、リバースロールコーター、コンマコーター、ゲートロールコーター、フィルムトランスファーコーター、リップコーター、ダイコーター、カーテンコーター等各種の塗工方式を用いることができる。   The ink receiving layer of the present invention can be installed, for example, by applying a coating liquid constituting the ink receiving layer on a paper support and drying it. The coating method is not particularly limited, and various coating methods such as air knife coater, blade coater, rod blade coater, bar coater, reverse roll coater, comma coater, gate roll coater, film transfer coater, lip coater, die coater and curtain coater. A construction method can be used.

また、本発明のインクジェット記録材料の裏面にはカールの抑制や滑り性、白色度、色相調整、糊付け適性の向上や裏面の耐水性を高める為に顔料やバインダー等からなるバックコート層を設ける事ができる。   In addition, a back coat layer made of a pigment, a binder, or the like may be provided on the back surface of the ink jet recording material of the present invention in order to suppress curling, improve slipperiness, whiteness, hue adjustment, pasteability, and increase water resistance of the back surface. Can do.

本発明のインクジェット記録材料は主に溶剤インクに対応するものである。一般的には揮発性溶媒に色材顔料を分散したものであるが、環境や人体に対する影響度配慮から、また臭気や取り扱いの危険性を提言するためにエチレングリコールモノブチルエーテルやプロピレングリコールモノメチルエーテルアセタートの様な溶剤が使われてきている。   The ink jet recording material of the present invention mainly corresponds to a solvent ink. In general, colorant pigments are dispersed in volatile solvents. However, in consideration of the impact on the environment and the human body, and in order to recommend odors and handling risks, ethylene glycol monobutyl ether and propylene glycol monomethyl ether acetate are used. Solvents such as tarts have been used.

また、本発明のインクジェット記録材料は上記溶剤インクの他に、溶剤の揮発性の低い油性インクや紫外線硬化型インクに対しても使用する事ができる。   The ink jet recording material of the present invention can also be used for oil-based inks and ultraviolet curable inks having low solvent volatility in addition to the above solvent inks.

以下本発明の実施例を示す。なお、本実施例中において、部は質量部を示す。   Examples of the present invention will be described below. In addition, in a present Example, a part shows a mass part.

(実施例1)
(インク受容層塗工液の調整)
水40部に湿式合成シリカ(トクヤマ社製ファインシールX−37B)10部を添加した後ノコギリ型ブレードを有する分散機を用いて十分に分散した。ついで引張り強さ35MPa、伸び480%の、ポリオールとしてポリエーテルポリオールを用いたポリウレタンの濃度35質量%のラテックス257部を添加・混合しインク受容層塗工液を得た。
Example 1
(Adjustment of ink receiving layer coating solution)
After adding 10 parts of wet synthetic silica (Fine Seal X-37B manufactured by Tokuyama Corporation) to 40 parts of water, it was sufficiently dispersed using a disperser having a saw blade. Subsequently, 257 parts of latex having a tensile strength of 35 MPa and an elongation of 480% and a polyurethane concentration of 35% by mass using a polyether polyol was added and mixed to obtain an ink receiving layer coating solution.

(インクジェット記録材料の作製)
坪量157g/m2の紙支持体(三菱製紙株式会社製ダイヤフォーム)上に、インク受容層塗工液をマイヤーバーを用いて乾燥後の塗抹量が10g/m2となるように塗工し、熱風型乾燥器を用いて乾燥させた。ついで塗層表面のベック平滑度が400秒となるようにカレンダーを用いて処理し実施例1のインクジェット記録材料を得た。
(Preparation of inkjet recording material)
Coating the ink receiving layer coating solution on a paper support having a basis weight of 157 g / m 2 (Mitsubishi Paper Co., Ltd. Diaform) using a Meyer bar so that the smear amount after drying is 10 g / m 2. And dried using a hot air dryer. Subsequently, it processed using the calendar | calender so that the Beck smoothness of the coating layer surface might be set to 400 second, and the inkjet recording material of Example 1 was obtained.

(実施例2)
インク受容層塗工液のポリウレタンラテックスに代え、引張り強さ40MPa、伸び700%の、ポリオールとしてポリエーテルポリオールを用いたポリウレタンラテックスを用いた以外は実施例1と同様にして実施例2のインクジェット記録材料を作製した。
(Example 2)
Ink jet recording of Example 2 in the same manner as in Example 1 except that polyurethane latex using polyether polyol as a polyol having a tensile strength of 40 MPa and an elongation of 700% was used instead of the polyurethane latex of the ink receiving layer coating liquid. The material was made.

(実施例3)
インク受容層塗工液のポリウレタンラテックスに代え、引張り強さ50MPa、伸び600%の、ポリオールとしてポリエーテルポリオールを用いたポリウレタンラテックスを用いた以外は実施例1と同様にして実施例3のインクジェット記録材料を作製した。
(Example 3)
Inkjet recording of Example 3 in the same manner as in Example 1 except that polyurethane latex using polyether polyol as a polyol having a tensile strength of 50 MPa and elongation of 600% was used instead of the polyurethane latex of the ink receiving layer coating liquid. The material was made.

(実施例4)
ポリウレタンラテックス257部の添加に代え、ポリウレタンラテックス114部を添加する以外は実施例1と同様にして実施例4のインクジェット記録材料を作製した。
Example 4
An ink jet recording material of Example 4 was produced in the same manner as in Example 1 except that 114 parts of polyurethane latex was added instead of adding 257 parts of polyurethane latex.

(実施例5)
ポリウレタンラテックス257部の添加に代え、ポリウレタンラテックス34部を添加する以外は実施例1と同様にして実施例5のインクジェット記録材料を作製した。
(Example 5)
An ink jet recording material of Example 5 was prepared in the same manner as in Example 1 except that 34 parts of polyurethane latex was added instead of adding 257 parts of polyurethane latex.

(実施例6)
インク受容層塗工液を乾燥後の塗抹量を5.5g/m2となるように塗工する以外は実施例1と同様にして実施例6のインクジェット記録材料を作製した。
(Example 6)
An ink jet recording material of Example 6 was produced in the same manner as in Example 1 except that the ink receiving layer coating solution was applied so that the amount of smear after drying was 5.5 g / m 2 .

(実施例7)
インク受容層塗工液を乾燥後の塗抹量を14g/m2となるように塗工する以外は実施例1と同様にして実施例7のインクジェット記録材料を作製した。
(Example 7)
An ink jet recording material of Example 7 was prepared in the same manner as in Example 1 except that the ink receiving layer coating solution was applied so that the amount of smear after drying was 14 g / m 2 .

(実施例8)
インク受容層塗工液を乾燥後の塗抹量を3.5g/m2となるように塗工する以外は実施例1と同様にして実施例8のインクジェット記録材料を作製した。
(Example 8)
An inkjet recording material of Example 8 was produced in the same manner as in Example 1 except that the ink-receiving layer coating solution was applied so that the coating amount after drying was 3.5 g / m 2 .

(実施例9)
インク受容層塗工液を乾燥後の塗抹量を18g/m2となるように塗工する以外は実施例1と同様にして実施例9のインクジェット記録材料を作製した。
Example 9
An ink jet recording material of Example 9 was produced in the same manner as in Example 1 except that the ink-receiving layer coating solution was applied so that the smear amount after drying was 18 g / m 2 .

(比較例1)
湿式合成シリカ10部を添加しない以外は実施例1と同様にして比較例1のインクジェット記録材料を作製した。
(Comparative Example 1)
An inkjet recording material of Comparative Example 1 was produced in the same manner as Example 1 except that 10 parts of wet synthetic silica was not added.

(比較例2)
湿式合成シリカの添加部数10部の代わりに3部とすること以外は実施例1と同様にして比較例2インクジェット記録材料を作製した。
(Comparative Example 2)
A comparative example 2 ink jet recording material was prepared in the same manner as in Example 1 except that 3 parts was used instead of 10 parts of the wet synthetic silica.

(比較例3)
水40部の代わりに水400部を使用し、湿式合成シリカ10部の代わりに100部使用すること以外は実施例1と同様にして比較例3のインクジェット記録材料を作製した。
(Comparative Example 3)
An inkjet recording material of Comparative Example 3 was prepared in the same manner as in Example 1 except that 400 parts of water was used instead of 40 parts of water and 100 parts of wet synthetic silica were used instead of 10 parts.

(比較例4)
インク受容層塗工液のポリウレタンラテックスに代え、引張り強さ22MPa、伸び750%の、ポリオールとしてポリエーテルポリオールを用いたポリウレタンラテックスを用いた以外は実施例1と同様にして比較例4のインクジェット記録材料を作製した。
(Comparative Example 4)
Inkjet recording of Comparative Example 4 in the same manner as in Example 1 except that polyurethane latex having a tensile strength of 22 MPa and elongation of 750% and using polyether polyol as the polyol was used instead of the polyurethane latex of the ink receiving layer coating liquid. The material was made.

(比較例5)
インク受容層塗工液のポリウレタンラテックスに代え、引張り強さ45MPa、伸び800%の、ポリオールとしてポリエーテルポリオールを用いたポリウレタンラテックスを用いた以外は実施例1と同様にして比較例5のインクジェット記録材料を作製した。
(Comparative Example 5)
Inkjet recording of Comparative Example 5 in the same manner as in Example 1 except that a polyurethane latex having a tensile strength of 45 MPa and an elongation of 800% and using a polyether polyol as a polyol was used instead of the polyurethane latex of the ink receiving layer coating liquid. The material was made.

(比較例6)
インク受容層塗工液のポリウレタンラテックスに代え、引張り強さ47MPa、伸び430%の、ポリエステル系ポリウレタンラテックスを用いた以外は実施例1と同様にして比較例6のインクジェット記録材料を作製した。
(Comparative Example 6)
An inkjet recording material of Comparative Example 6 was prepared in the same manner as in Example 1 except that a polyester-based polyurethane latex having a tensile strength of 47 MPa and an elongation of 430% was used instead of the polyurethane latex of the ink receiving layer coating liquid.

(比較例7)
インク受容層塗工液のポリウレタンラテックスに代え、引張り強さ55MPa、伸び300%のポリカーボネート系ポリウレタンラテックスを用いた以外は実施例1と同様にして比較例7のインクジェット記録材料を作製した。
(Comparative Example 7)
An inkjet recording material of Comparative Example 7 was prepared in the same manner as in Example 1 except that a polycarbonate-based polyurethane latex having a tensile strength of 55 MPa and an elongation of 300% was used instead of the polyurethane latex of the ink receiving layer coating solution.

(比較例8)
湿式合成シリカの代わりに、平均粒子径4μmの軽質炭酸カルシウムを使用する以外は実施例1と同様にして比較例8のインクジェット記録材料を作製した。
(Comparative Example 8)
An inkjet recording material of Comparative Example 8 was produced in the same manner as Example 1 except that light calcium carbonate having an average particle size of 4 μm was used instead of wet synthetic silica.

実施例1〜9、比較例1〜8で得たインクジェット記録材料について溶剤系インクジェットプリンタ(VP300:ローランドDG社製)により所定の評価画像を印字し、以下の評価を行った。
(発色濃度評価)
所定の評価画像を印字した後、室温にて24時間乾燥後、グラタグマククベス製光学濃度計にて黒色印字部の画像濃度を測定した。1.5以上の値であれば十分な発色濃度であると言える。
About the inkjet recording material obtained in Examples 1-9 and Comparative Examples 1-8, the predetermined | prescribed evaluation image was printed with the solvent-type inkjet printer (VP300: product made by Roland DG), and the following evaluation was performed.
(Color density evaluation)
After printing a predetermined evaluation image, it was dried at room temperature for 24 hours, and then the image density of the black print portion was measured with an optical densitometer manufactured by Gratag Macbeth. A value of 1.5 or more can be said to be a sufficient color density.

(インク速乾性評価)
所定の評価画像を印字した後、室温にて30分放置後、印字部をコピー用紙と重ね合わせ、印字部のコピー用紙への転写を目視で観察した。評価基準としてA(転写がなく非常に良好)、B(若干転写が見られるが実用上問題ない)、C(転写が見られ実用上問題となる可能性がある)、D(転写が顕著に見られ実用上問題となる)に分類し評価した。
(Ink quick-drying evaluation)
After a predetermined evaluation image was printed, the printing part was allowed to stand at room temperature for 30 minutes, and then the printing part was superimposed on the copy paper, and the transfer of the printing part to the copy paper was visually observed. As evaluation criteria, A (very good with no transfer), B (slight transfer is observed but there is no problem in practice), C (transfer is seen and may be a problem in practice), D (transfer is notable) It is seen and becomes a problem in practical use) and evaluated.

(耐水性評価)
インクジェット記録材料を20℃の水に24時間浸漬した後取り出し、直ちにインク受容層表面を指にて5回強くこすり、インク受容層の欠落状況を目視で観察した。評価基準としてはA(まったくインク受容層の欠落が観察されず良好)、B(若干欠落が観察されるが実用上問題ない)、C(欠落が見られ実用上問題となる可能性がある)、D(欠落が顕著に見られ実用上問題となる)に分類し評価した。
(Water resistance evaluation)
The ink jet recording material was immersed in water at 20 ° C. for 24 hours and then taken out. Immediately, the surface of the ink receiving layer was strongly rubbed with a finger five times, and the missing state of the ink receiving layer was visually observed. As evaluation criteria, A (no missing ink receiving layer is observed and good), B (slight missing is observed but no problem for practical use), C (missing is observed and may be a practical problem) , D (noticeable due to the lack of defects) and evaluation.

(印字部の耐スクラッチ性評価)
所定の評価画像を印字した後、室温にて24時間乾燥後、印字部にコピー用紙を重ね合わせた。その上に質量1kg、直径53mmの分銅を置き横にコピー用紙とともに横に引いた後のコピー用紙への印字部発色成分の付着状況を目視で観察した。評価基準としてはA(まったく発色成分が付着しておらず良好な耐スクラッチ性)、B(若干付着が見られるが実用上問題ない)、C(付着が見られ実用上問題となる可能性がある)、D(付着が顕著で実用上問題となる)に分類し評価した。
(Scratch resistance evaluation of printed part)
After printing a predetermined evaluation image, it was dried at room temperature for 24 hours, and then a copy paper was superimposed on the printing portion. A weight having a mass of 1 kg and a diameter of 53 mm was placed thereon, and the state of adhesion of the color developing component on the copy paper after being pulled sideways along with the copy paper was visually observed. As evaluation criteria, A (no good coloring component is adhered and good scratch resistance), B (slight adhesion is observed but there is no problem in practical use), C (adhesion is observed and may be a practical problem) And D) (adhesion is remarkable and causes a practical problem).

各実施例、比較例で得られたインクジェット記録材料の評価結果を表1に示す。   Table 1 shows the evaluation results of the ink jet recording materials obtained in the examples and comparative examples.

Figure 2008246963
Figure 2008246963

インク受容層に、ポリエーテルポリオールを原料としてなるポリウレタン樹脂とシリカを含有し、ポリウレタン樹脂とシリカの質量比が95:5〜50:50であり、かつ該ポリウレタン樹脂の、JIS K 7311に規定される引張り強さが30〜70MPa、伸びが300〜700%である実施例1〜9のインクジェット記録材料は溶剤系インクにて印字した際の発色濃度、インク速乾性が良好であり、またインク受容層の耐水性、印字部の耐スクラッチ性も良好であることがわかる。特に該インク受容層の乾燥後の塗抹量が5〜15g/m2の範囲である実施例1〜7は、この範囲にない実施例8、9と比べ特に良好なインク受容層の耐水性あるいはインク速乾性を示すことがわかる。 The ink-receptive layer contains a polyurethane resin and silica made from polyether polyol as a raw material, the mass ratio of the polyurethane resin to silica is 95: 5 to 50:50, and is defined in JIS K 7311 of the polyurethane resin. The ink-jet recording materials of Examples 1 to 9 having a tensile strength of 30 to 70 MPa and an elongation of 300 to 700% have good color density and good ink quick-drying property when printed with solvent-based ink, and ink acceptance. It can be seen that the water resistance of the layer and the scratch resistance of the printed part are also good. In particular, Examples 1 to 7 in which the smear amount after drying of the ink receiving layer is in the range of 5 to 15 g / m 2 are particularly excellent in water resistance of the ink receiving layer compared to Examples 8 and 9 which are not in this range. It turns out that ink quick-drying is shown.

これに対しポリエーテルポリオールを原料としてなるポリウレタン樹脂であってもJIS K 7311に規定される引張り強さが30〜70MPa、伸びが300〜700%の範囲外のポリウレタン樹脂を使用した比較例3、4、5やポリエーテルポリオールを原料しないポリウレタン樹脂(比較例6、7)では印字部の耐スクラッチ性が不十分であることが分かる。またインク受容層中のシリカの添加量が本発明の範囲外(比較例1、2、3)であった場合やシリカ以外の無機顔料を使用した場合(比較例8)も発色濃度あるいはインク速乾性、耐水性のいずれかの特性が不十分である。   On the other hand, even if it is a polyurethane resin which uses polyether polyol as a raw material, the comparative example 3 which uses the polyurethane resin whose tensile strength prescribed | regulated to JISK7311 is outside the range of 30-70 MPa and elongation is 300-700%, It can be seen that 4, 5 and a polyurethane resin (Comparative Examples 6 and 7) that does not use a polyether polyol as a raw material have insufficient scratch resistance in the printed portion. Further, when the addition amount of silica in the ink receiving layer is out of the range of the present invention (Comparative Examples 1, 2, and 3) or when an inorganic pigment other than silica is used (Comparative Example 8), the color density or the ink speed is also increased. Either dryness or water resistance is insufficient.

Claims (2)

紙支持体に、インク受容層が形成されているインクジェット記録材料において、該インク受容層に、ポリエーテルポリオールを原料としてなるポリウレタン樹脂とシリカを含有し、ポリウレタン樹脂とシリカの質量比が95:5〜50:50であり、かつ該ポリウレタン樹脂の、JIS K 7311に規定される引張り強さが30〜70MPa、伸びが300〜700%であることを特徴とするインクジェット記録材料。   In an ink jet recording material in which an ink receiving layer is formed on a paper support, the ink receiving layer contains a polyurethane resin and silica using a polyether polyol as a raw material, and the mass ratio of the polyurethane resin to silica is 95: 5. An inkjet recording material having a tensile strength of 30 to 70 MPa and an elongation of 300 to 700% as defined in JIS K 7311 of the polyurethane resin. 該インク受容層の乾燥後の塗抹量が5〜15g/m2である請求項1記載のインクジェット記録材料。 2. The ink jet recording material according to claim 1, wherein a smear amount after drying of the ink receiving layer is 5 to 15 g / m < 2 >.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10315611A (en) * 1997-05-19 1998-12-02 Toyo Ink Mfg Co Ltd Ink jet recording material and production thereof
JP2002248850A (en) * 2001-02-23 2002-09-03 Hokuetsu Paper Mills Ltd Cast glossy paper for ink jet recoding and manufacturing method therefor
JP2003251927A (en) * 2002-03-05 2003-09-09 Union Chemicar Co Ltd Recording material for ink jet
JP2005001334A (en) * 2003-06-13 2005-01-06 Nippon Paper Industries Co Ltd Ink jet recording cast-coated paper
JP2006247963A (en) * 2005-03-09 2006-09-21 Oji Paper Co Ltd Inkjet recording sheet

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10315611A (en) * 1997-05-19 1998-12-02 Toyo Ink Mfg Co Ltd Ink jet recording material and production thereof
JP2002248850A (en) * 2001-02-23 2002-09-03 Hokuetsu Paper Mills Ltd Cast glossy paper for ink jet recoding and manufacturing method therefor
JP2003251927A (en) * 2002-03-05 2003-09-09 Union Chemicar Co Ltd Recording material for ink jet
JP2005001334A (en) * 2003-06-13 2005-01-06 Nippon Paper Industries Co Ltd Ink jet recording cast-coated paper
JP2006247963A (en) * 2005-03-09 2006-09-21 Oji Paper Co Ltd Inkjet recording sheet

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