JPH07172037A - Ink-jet recording sheet - Google Patents

Ink-jet recording sheet

Info

Publication number
JPH07172037A
JPH07172037A JP5321717A JP32171793A JPH07172037A JP H07172037 A JPH07172037 A JP H07172037A JP 5321717 A JP5321717 A JP 5321717A JP 32171793 A JP32171793 A JP 32171793A JP H07172037 A JPH07172037 A JP H07172037A
Authority
JP
Japan
Prior art keywords
printing
parts
ink
particles
porous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP5321717A
Other languages
Japanese (ja)
Inventor
Futoshi Hoshino
Kosuke Someya
太 星野
浩介 染矢
Original Assignee
Mitsui Toatsu Chem Inc
三井東圧化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsui Toatsu Chem Inc, 三井東圧化学株式会社 filed Critical Mitsui Toatsu Chem Inc
Priority to JP5321717A priority Critical patent/JPH07172037A/en
Publication of JPH07172037A publication Critical patent/JPH07172037A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To cope with far higher resolution printing since strike-through is hard to occur as ink absorption per unit capacity on a surface part is increasing in the quantity, by a method wherein the sheet is allowed to contain porous resin particles. CONSTITUTION:An ink-jet recording sheet is allowed to contain porous resin particles. Although the porous resin particles are obtained by various polymerizing methods, emulsion polymerization is preferable. In a resin component, a sheet base which is allowed to contain the porous resin particles, for example, polyester resin, methacrylate resin or polycarbonate resin possesses pulp or paper possessing the pulp as its row materials or polyolefin or polyester as their row materials. Although there are various methods which allow a printed body sheet to contain porous resin particles, it is most preferable to apply to a sheet base along with a binder. The quantity of porous particles which are allowed to contain in the sheet base are taken preferably as 10-50wt.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、印刷時の文字の滲みが
少なく、鮮明で高解像度の印刷が可能で、印字濃度や鮮
明さの経時変化が少なく、且つ印字部のインクの乾燥が
速く、未乾燥のインクによる汚損の起こりにくい、イン
クジェット印刷用の記録シートに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has little blurring of characters during printing, enables clear and high-resolution printing, has little change in printing density and sharpness with time, and can dry ink in a printing portion quickly. The present invention relates to a recording sheet for inkjet printing, which is less likely to be stained by undried ink.

【0002】[0002]

【従来の技術】近年、紙やOHPフィルム等の基材に文
字や画像を印字・印刷する為の色々な技術が提唱されて
いる。これらの技術は多種多様であるが、事務所や一般
家庭に於いて高度な専門知識や技術を要せず、一般的に
普及している印字・印刷技術は多くはない。一般的に普
及した印字・印刷技術の例としては、伝票発行用プリン
ター等に用いられるドット・インパクト方式、個人用ワ
ードプロセッサー等に用いられる熱転写方式、ファクシ
ミリ等に用いられる感熱印字方式、コピー機等に用いら
れる電子写真方式などがあるが、近年最も一般家庭・事
務所等に於いて普及しつつあるものがインクジェット方
式である。
2. Description of the Related Art In recent years, various techniques for printing and printing characters and images on a substrate such as paper and OHP film have been proposed. Although these techniques are diverse, there are not many printing / printing techniques that are widely used without requiring specialized knowledge and techniques in offices and homes. Examples of popular printing / printing technology include dot impact method used in voucher printers, thermal transfer method used in personal word processors, thermal printing method used in facsimiles, and copy machines. Although there are electrophotographic methods and the like used, the inkjet method has become widespread in most homes and offices in recent years.

【0003】インクジェット方式とは、基本的には、水
性、油性或いは溶剤性のインク液滴を微細なノズルより
噴射し、紙等の被印字面に付着させ、文字又は画像とし
ての情報を得る方式である。このインクジェット方式
も、インク液滴の発生方法、インク液滴の付着方法、或
いはインクの種類などから分類されうる様々な方式が提
唱されており、これらの技術を応用したインクジェット
・プリンターが数多く製品化されている。
The ink jet system is basically a system in which water, oil, or solvent ink droplets are ejected from fine nozzles and adhered to a printing surface such as paper to obtain information as characters or images. Is. As for this inkjet method, various methods that can be classified by the method of generating ink droplets, the method of attaching ink droplets, the type of ink, etc. have been proposed, and many inkjet printers that apply these technologies have been commercialized. Has been done.

【0004】インクジェット方式の長所は、他の方式と
比べ、(1)被印字体の形状や種類の制限が少なく、感
熱紙など特別な用紙等を必要としない。また、印字媒体
(インク)の消費は印字部に限って行われ、かつまた印
字媒体の補給は通常インクを補給するだけで良く、印字
コストが低い。(2)印字時に騒音をほとんど発せず静
粛であり、印字面と印字装置が機械的に接触しないので
高速印刷が可能である。(3)印字装置が大がかりでな
く小型化が可能であり、装置の消費電力も小さい、等が
挙げられる。即ち低コスト、静粛、小型の特徴から、該
方式は広く普及している。
The advantages of the ink jet system are (1) there are few restrictions on the shape and type of the printing medium, and no special paper such as thermal paper is required. Further, the consumption of the printing medium (ink) is limited to the printing section, and the printing medium can be replenished only by replenishing the ink, and the printing cost is low. (2) Quiet with almost no noise during printing, and high-speed printing is possible because the printing surface and the printing device do not mechanically contact each other. (3) The printing device is not large and can be downsized, and the power consumption of the device is small. That is, the method is widely used because of its low cost, quietness, and small size.

【0005】しかしながら、インクジェット方式の短所
としては、液体状態のインクを被印字体に付着させると
いう、該方式の原理より(1)被印字体の表面状態によ
っては、印字の滲みやコントラストのムラが発生しやす
い。(2)印字直後に印字面に手を触れたり、印字済み
の用紙等を重ねたりした場合、未乾燥のインクが付着し
て周辺を汚損し易い、等が挙げられる。近年市場の要請
から、該方式もより高速、高解像度であることを求めら
れている。またカラー印刷等、複数の色のインクを重ね
て印字する事も多くなっている。
However, the disadvantages of the ink jet system are that ink in a liquid state is adhered to a printing medium, and the principle of the system is as follows: (1) Depending on the surface state of the printing medium, bleeding of printing and unevenness of contrast may occur. Likely to happen. (2) When the printed surface is touched immediately after printing, or when printed sheets are overlaid, undried ink adheres and stains the surrounding area. Due to market demands in recent years, the system is also required to have higher speed and higher resolution. In addition, in many cases, such as color printing, inks of a plurality of colors are overlaid and printed.

【0006】インクジェット印字をより高解像度にする
と、印字の大きさの最小単位であるドットの大きさが小
さくなる。これは噴射するインクの量の最小単位が小さ
くなる事でもある。従って被印字体に付着したインクが
被印字体の奥深く浸透する場合、被印字体表層付近の有
効なインク中の顔料・染料の量が減少し、印字のコント
ラストがより顕著に低下する。また、付着したインクが
被印字体の表層付近で横方向に拡がる場合、印字の滲み
となって解像度を低下させる。
When the ink jet printing has a higher resolution, the dot size which is the minimum unit of the printing size becomes smaller. This also means that the minimum unit of the amount of ejected ink becomes small. Therefore, when the ink adhering to the printing medium penetrates deep into the printing medium, the amount of pigment / dye in the effective ink near the surface layer of the printing medium decreases, and the printing contrast decreases significantly. Further, when the adhered ink spreads in the lateral direction near the surface layer of the printing medium, it causes bleeding of the printing and lowers the resolution.

【0007】コントラストの低下と滲みを防止するに
は、被印字体の表面を平滑にし、表層付近の細孔を減少
させる方法があるが、この方法では被印字体へのインク
の吸収が遅くなり、インクの乾燥に時間がかかり、印字
直後の印字部分に触れた物体を汚損したり、得られた印
字や画像情報を損なう事がある。またインクジェット方
式の場合、インクの粘度が低い事が必須であるため、被
印字体へのインクの吸収が遅い場合、噴射されたインク
がはねたり、未乾燥のインクが流れ落ちてしまう事もあ
り、これが印字の滲みの原因となる場合もある。これら
の事は印字の高速化についても障害となる。
In order to prevent the deterioration of contrast and bleeding, there is a method of smoothing the surface of the printing medium and reducing the pores in the vicinity of the surface layer. However, this method slows the absorption of ink into the printing medium. However, it takes a long time to dry the ink, and an object that touches the printed portion immediately after printing may be soiled or the obtained printing or image information may be damaged. Further, in the case of the inkjet method, it is essential that the viscosity of the ink is low. Therefore, when the absorption of the ink to the printing medium is slow, the ejected ink may splash or the undried ink may flow down. However, this may cause blurring of printing. These things also hinder the speeding up of printing.

【0008】またインクジェット方式によるカラー印刷
の場合、複数種のインクが順番に噴射されるので、被印
字体のインク吸収量が少ないと先に噴射された色のイン
クは被付着体に吸収され、後から噴射されたものは吸収
されず表面付近にとどまる。このため、後から噴射され
た色の方がより強く発色される事になり、最終的な色彩
が設定通りにならない事がある。
Further, in the case of color printing by the ink jet system, a plurality of types of inks are ejected in order, so if the ink absorption amount of the printing object is small, the previously ejected color ink is absorbed by the adhesion object, What is injected later is not absorbed and remains near the surface. Therefore, the color ejected later may be more intensely colored, and the final color may not be as set.

【0009】インク自体の改良で乾燥性を向上させる方
法もあるが、インクの非溶剤化、水性化によって寧ろ乾
燥性は低下する傾向にある。このような、インクジェッ
ト方式の高速化と高解像度化に関する相反する要因を解
決する手段としては、被印字体の表層付近を多孔質化
し、表層付近の吸水・吸油性を向上させる方法がある。
即ち、表層付近に充分なインクの吸収能力があれば、被
印字体全体の吸収能力の如何に関わらず、インクは全て
速やかに表層付近に吸収され、かつその場所に留まるた
め、上記の問題は解決される。被印字体の表層付近を多
孔質化する手段としてはコロイダルシリカ等の無機多孔
質粒子を被印字体に含有させたり、塗工する方法があ
る。しかしながら無機粒子は一般に硬質であり、印字装
置の走行系を傷めやすいと言う問題点がある。また、無
機粒子は重量が樹脂粒子と比して非常に大きいため、無
機粒子を使用した被印字体の重量が大きくなり、また、
樹脂粒子を用いた被印字体と同じ重量にすれば、無機粒
子の使用量が減少し、効果が少なくなると言う問題点が
あった。
There is also a method of improving the drying property by improving the ink itself, but the drying property tends to decrease rather by making the ink non-solvent and water-based. As a means for solving such contradictory factors relating to speeding up and high resolution of the ink jet system, there is a method of making the surface layer of the printing object porous and improving the water absorption and oil absorption properties near the surface layer.
That is, if there is sufficient ink absorption capacity in the vicinity of the surface layer, all the ink is promptly absorbed in the vicinity of the surface layer regardless of the absorption capacity of the entire print object, and stays at that location. Will be resolved. As a means for making the surface of the printing medium near the surface layer porous, there is a method of incorporating or coating inorganic porous particles such as colloidal silica into the printing medium. However, the inorganic particles are generally hard and have a problem that the running system of the printing apparatus is easily damaged. In addition, since the weight of the inorganic particles is much larger than that of the resin particles, the weight of the object to be printed using the inorganic particles becomes large, and
If the same weight as that of the printing object using the resin particles is used, the amount of the inorganic particles used is decreased, and the effect is reduced.

【0010】[0010]

【発明が解決しようとする課題】本発明の目的は、より
高解像度、高速のインクジェット方式に対応できる、イ
ンクジェット記録シート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 sheet which can be applied to an ink jet system of higher resolution and higher speed.

【0011】[0011]

【課題を解決するための手段】上記問題を解決すべく鋭
意検討を重ねた結果、多孔質樹脂粒子が吸水・吸油性に
優れ、かつ、無機多孔質粒子と比べ軽量、軟質である事
から、本発明を完成させるに至ったものである。即ち、
本発明は、多孔質樹脂粒子を含有する事を特徴とするイ
ンクジェット記録シートである。
[Means for Solving the Problems] As a result of extensive studies to solve the above problems, the porous resin particles are excellent in water absorption and oil absorption, and are lighter and softer than the inorganic porous particles. The present invention has been completed. That is,
The present invention is an ink jet recording sheet characterized by containing porous resin particles.

【0012】以下、本発明について詳しく説明する。本
発明において使用される多孔質樹脂粒子とは、乳化重合
法、懸濁重合法、分散重合法、その他の重合法によって
得られたもので良く、また塊状の多孔質樹脂を粉砕した
ものでも良い。樹脂の成分については例えばポリエステ
ル樹脂、メタクリル樹脂、ポリカーボネート樹脂、スチ
レン共重合体樹脂、塩化ビニル樹脂、ポリプロピレン樹
脂及びこれらのブレンドなど特に限定されない。また、
該樹脂粒子を多孔質化する、もしくは多孔質化した樹脂
を得る手段についても特に限定されない。そのうち、乳
化重合によって得られる多孔質樹脂粒子が好ましく、例
えば特開平2-70741 号公報に開示されている微粒子集合
体エマルション粒子が好ましい。更に本発明者らによる
特開平5-222108号記載の乾燥時の構造が粒子の表層部か
ら内部を結ぶ貫通孔を1個以上有し、且つ粒子直径が
0.1〜5.0μである事を特徴とする多層構造エマル
ション粒子ならより好ましい。
The present invention will be described in detail below. The porous resin particles used in the present invention may be those obtained by an emulsion polymerization method, a suspension polymerization method, a dispersion polymerization method, or another polymerization method, or may be a pulverized lump of porous resin. . The resin component is not particularly limited, for example, polyester resin, methacrylic resin, polycarbonate resin, styrene copolymer resin, vinyl chloride resin, polypropylene resin and blends thereof. Also,
The means for making the resin particles porous or for obtaining the resin made porous is not particularly limited. Among them, porous resin particles obtained by emulsion polymerization are preferable, and for example, fine particle aggregate emulsion particles disclosed in JP-A-2-70741 are preferable. Further, the structure described in Japanese Patent Laid-Open No. 5-222108 by the present inventors has one or more through-holes connecting the surface layer of the particles to the inside thereof, and the particle diameter is 0.1 to 5.0 μm. It is more preferable that the emulsion particles have a multilayer structure.

【0013】該多孔質樹脂粒子の粒子径は、0.05〜
100μ、好ましくは0.1〜50μ、より好ましくは
0.2〜20μである。粒子径0.05μ未満では粒子
を多孔質化する事が困難である。また100μ以上では
被印字体の表面の凹凸が大きくなり、被印字面の平滑性
を著しく損ない、本発明の目的に反する。
The particle size of the porous resin particles is from 0.05 to
It is 100μ, preferably 0.1 to 50μ, and more preferably 0.2 to 20μ. If the particle size is less than 0.05 μ, it is difficult to make the particles porous. On the other hand, when it is 100 μm or more, the unevenness of the surface of the printing object becomes large, and the smoothness of the printing surface is significantly impaired, which is contrary to the object of the present invention.

【0014】該多孔質樹脂粒子が多孔質化されているか
否かは、外見的には電子顕微鏡等を用いて知ることがで
きるが、多孔質化の程度は、水銀ポロシメーターによる
比表面積の測定によって確認することが出来る。またJ
IS K−5101に記載されている吸油量の測定によ
って確認することも出来る。これは粒子表面及び内部に
存在する細孔の毛細管現象により、同成分、同粒径の多
孔質でない粒子よりも多くの油を吸う事を利用してい
る。
Whether or not the porous resin particles have been made porous can be externally known by using an electron microscope or the like. The degree of porosity can be determined by measuring the specific surface area with a mercury porosimeter. You can check. See J
It can also be confirmed by measuring the oil absorption amount described in IS K-5101. This utilizes the fact that it absorbs more oil than non-porous particles of the same component and the same particle size due to the capillarity of the pores existing on the surface and inside the particles.

【0015】このような多孔質樹脂粒子が被印字体シー
ト中に含有、もしくは該シート表面に塗工されることに
より、該シートの表面部がより微細に多孔質化される。
表面部が微細に多孔質化されると、該シートの表面近傍
付近に於ける単位体積あたりの吸水・吸油量が増加す
る。この吸収能の向上した表面部分にノズルから噴射さ
れたインクが付着すれば直ちに吸収されるが、充分な吸
収能があるため、インクは奥深くまで浸透せずに、該シ
ートの表面付近で乾燥・固定されることになる。一方、
多孔質樹脂粒子を含有しなくとも、例えば未塗工の紙原
紙なども多孔質ではある。しかしこの場合、その「孔」
は紙の繊維同士の隙間であり、多孔質樹脂粒子の持つ
「孔」とは形状も大きさも異なり、また、繊維そのもの
に於いての単位体積あたりの吸収能は、多孔質樹脂粒子
や無機多孔質粒子と比べて、低い。従って紙原紙等の場
合、付着したインクは繊維同士の隙間を浸透していくこ
とになり、このため上述した、コントラスト低下や滲み
を発生させることになる。
By containing such a porous resin particle in the sheet to be printed or coating it on the surface of the sheet, the surface portion of the sheet is made more finely porous.
When the surface portion is made finely porous, the amount of water absorption / oil absorption per unit volume in the vicinity of the surface of the sheet increases. If the ink ejected from the nozzle adheres to the surface portion with improved absorption capacity, it is immediately absorbed, but since it has sufficient absorption capacity, the ink does not penetrate deeply and dries near the surface of the sheet. It will be fixed. on the other hand,
Even if it does not contain porous resin particles, for example, uncoated paper base paper is also porous. But in this case, the "hole"
Is the gap between the fibers of the paper, and the shape and size are different from the “pores” of the porous resin particles. Also, the absorption capacity per unit volume of the fibers themselves is Low compared to quality particles. Therefore, in the case of paper base paper or the like, the adhered ink permeates through the gaps between the fibers, which causes the above-described decrease in contrast and bleeding.

【0016】またコロイダルシリカ等の無機多孔質粒子
を使用した場合、一般に硬質であることから、印字装置
の走行系を傷めやすく、高速印刷や、長期にわたる使用
において問題がある。また、無機粒子は重量が樹脂粒子
と比して非常に大きいため、無機粒子を使用した被印字
体シートの重量が大きくなり、また、樹脂粒子を用いた
被印字体シートと同じ重量にすれば、無機粒子の使用量
が減少し、効果が少なくなる。さらに、インクの顔料や
染料を固着させる成分は、樹脂粒子と比べ無機粒子との
親和性に乏しく、このためインクが一旦無機粒子に吸収
されても、インクが乾燥・固定される前に毛細管現象に
よって拡散し、コントラスト低下や滲みを発生させる。
In addition, when inorganic porous particles such as colloidal silica are used, they are generally hard and therefore easily damage the running system of the printing device, which causes problems in high-speed printing and long-term use. In addition, since the weight of the inorganic particles is much larger than that of the resin particles, the weight of the sheet to be printed using the inorganic particles becomes large, and if the weight of the sheet to be printed using the resin particles is the same as that of the sheet to be printed. , The amount of inorganic particles used is reduced, and the effect is reduced. In addition, the components that fix the pigments and dyes of the ink have less affinity with the inorganic particles than the resin particles, so even if the ink is once absorbed by the inorganic particles, the capillary phenomenon occurs before the ink is dried and fixed. Diffuses and causes a decrease in contrast and bleeding.

【0017】このように、多孔質樹脂粒子を被印字体シ
ート中に含有させれば、該シートのインク吸収能は著し
く向上し、その効果は無機粒子を上回る。多孔質樹脂粒
子を含有させるシート基材としては、パルプ及びパルプ
を主原料にした紙、再生紙、合成紙、ポリオレフィンや
ポリエステル等を主原料にしたフィルムなどが挙げられ
るが特に限定はされない。また、これらシートには必要
に応じてラテックスを含侵させたり、耐水化剤や紙力増
強剤を内添したり、サイズプレスを行ったり、蛍光剤や
白色顔料を添加するなど、従来のシートと同様な処理・
高付加価値化を行って良く、特に制限はない。
As described above, when the porous resin particles are contained in the sheet to be printed, the ink absorbing ability of the sheet is remarkably improved, and the effect is superior to the inorganic particles. Examples of the sheet base material containing the porous resin particles include, but are not particularly limited to, pulp and pulp-based paper, recycled paper, synthetic paper, and films based on polyolefin and polyester. In addition, if necessary, latex may be impregnated into these sheets, a waterproofing agent or a paper strengthening agent may be internally added, size press may be performed, and a fluorescent agent or a white pigment may be added to the sheet. Processing similar to
There is no particular limitation as long as the added value is increased.

【0018】多孔質樹脂粒子を被印字体シートに含有さ
せる方法は、バインダーと共にシート基材に塗工するほ
か、シート基材に内添したり、溶融したシート基材原料
と共に成形・フィルム化しても良く、特に限定されない
が、紙をシート基材としてその表面にバインダーと共に
塗工するのが好ましい。該シート基材に塗工を行う場
合、使用するバインダーや他の顔料等の添加剤の種類や
量及び塗工方法については一般的な塗工紙と同じでよ
く、特に制限はない。内添や成形等によってシート基材
に含有させる場合も従来の樹脂粒子を含有させる方法と
同じでよく、また組み合わせて用いる添加剤等も同様に
用いることができる。
The method for incorporating the porous resin particles into the sheet to be printed is to coat the sheet base material with a binder, add it internally to the sheet base material, or form / film with the molten sheet base material. Although it is not particularly limited, it is preferable to coat paper with a binder as a sheet base material on the surface thereof. When the sheet base material is coated, the type and amount of the binder and other additives such as other pigments to be used and the coating method may be the same as those for general coated paper, and there is no particular limitation. When it is contained in the sheet base material by internal addition or molding, it may be the same as the conventional method of containing the resin particles, and the additive or the like used in combination may be similarly used.

【0019】シート基材に含有させる該多孔質粒子の量
は、多いほど吸油能の効果が大である。しかしながら、
シート基材全体100重量部に対し5〜80重量部、好
ましくは10〜50重量含有させるのがよい。含有量が
5重量部未満では効果が少なく、80重量部以上含有さ
せると、基材の強度が極端に低下し実用的でない。ただ
し、シート基材上に塗工する場合、該粒子が塗工層のみ
に存在するので、基材の強度を考慮する必要が無く、ま
た、シート表面付近に存在する有効な粒子の数が増大す
るのでより効果的である。従って塗工の場合、塗工層全
体の重量に対し1〜95重量部、好ましくは5〜60重
量部含有させればよい。含有量が1重量部未満では効果
が少なく、95重量部以上含有させると、塗工層の強度
が極端に低下し実用的でない。また被塗工基材に対する
塗工層成分の量は一般的な塗工紙と同じでよい。これら
多孔質樹脂粒子を含有した被印字体シートに対し、キャ
レンダー処理等、表面部分の平滑性を向上させる後処理
を行うことも効果があり、好ましい。
The larger the amount of the porous particles contained in the sheet base material, the greater the effect of oil absorption. However,
It is preferable to add 5 to 80 parts by weight, preferably 10 to 50 parts by weight, based on 100 parts by weight of the entire sheet substrate. If the content is less than 5 parts by weight, the effect is small, and if the content is 80 parts by weight or more, the strength of the base material is extremely lowered, which is not practical. However, when coating on a sheet substrate, since the particles are present only in the coating layer, it is not necessary to consider the strength of the substrate, and the number of effective particles existing near the sheet surface increases. So it is more effective. Therefore, in the case of coating, it may be contained in an amount of 1 to 95 parts by weight, preferably 5 to 60 parts by weight, based on the total weight of the coating layer. If the content is less than 1 part by weight, the effect is small, and if the content is 95 parts by weight or more, the strength of the coating layer is extremely reduced, which is not practical. The amount of the coating layer component with respect to the base material to be coated may be the same as that of general coated paper. It is also effective to subject the sheet to be printed containing these porous resin particles to post-treatment such as calendering for improving the smoothness of the surface portion, which is preferable.

【0020】[0020]

〔インクジェット記録シートの作製〕[Preparation of inkjet recording sheet]

実施例−1 特開平5-222108号公報の重合例−1に開示されている方
法に準じて多孔質樹脂粒子を作製した。撹拌機、温度
計、還流コンデンサー付きのセパラブルフラスコに水2
500部を仕込み、撹拌化に窒素置換しながら80℃ま
で昇温する。内温を80℃に保ち、重合開始剤として、
過硫酸カリウム1.5部を添加し、溶解後、予め水7
部、ラウリル硫酸ナトリウム0.2部にスチレン16
部、メタクリル酸0.3部、ジビニルベンゼン0.2部
を撹拌下に加えて作成した乳化物をセパラブルフラスコ
内に仕込み、1時間重合させ、種粒子エマルションを作
製した。次に予め水40部、ラウリル硫酸ナトリウム
0.3部にメタクリル酸メチル55部、アクリル酸ブチ
ル5部、メタクリル酸40部を撹拌下に加えて作成した
乳化物を連続的に1時間かけて添加して反応させ、添加
終了後1時間の熟成を行った。
Example-1 Porous resin particles were prepared according to the method disclosed in Polymerization Example-1 of JP-A-5-222108. Water in a separable flask equipped with a stirrer, thermometer and reflux condenser.
500 parts are charged, and the temperature is raised to 80 ° C. while substituting nitrogen for stirring. Keeping the internal temperature at 80 ℃, as a polymerization initiator,
After adding 1.5 parts of potassium persulfate and dissolving, water 7
Parts, styrene 16 to 0.2 parts sodium lauryl sulfate
, 0.3 parts of methacrylic acid, and 0.2 parts of divinylbenzene were added with stirring to prepare an emulsion, which was charged in a separable flask and polymerized for 1 hour to prepare a seed particle emulsion. Next, an emulsion prepared by previously adding 40 parts of water, 0.3 part of sodium lauryl sulfate to 55 parts of methyl methacrylate, 5 parts of butyl acrylate, and 40 parts of methacrylic acid was continuously added over 1 hour. The reaction was carried out, and aging was carried out for 1 hour after the addition was completed.

【0021】続いて重合開始剤として、過硫酸アンモニ
ウム3部を水30部に溶解した水溶液を加え、さらに予
め水240部、ラウリル硫酸ナトリウム1.2部にメタ
クリル酸メチル468部、アクリル酸ブチル120部、
メタクリル酸12部を撹拌下に加えて作成した乳化物を
連続的に1時間かけて添加して反応させ、添加終了後さ
らに2時間の熟成を行った。
Subsequently, as a polymerization initiator, an aqueous solution prepared by dissolving 3 parts of ammonium persulfate in 30 parts of water was added, and further 240 parts of water, 1.2 parts of sodium lauryl sulfate, 468 parts of methyl methacrylate, and 120 parts of butyl acrylate. ,
An emulsion prepared by adding 12 parts of methacrylic acid with stirring was continuously added over 1 hour to cause a reaction, and aging was continued for 2 hours after the addition was completed.

【0022】重合終了後、撹拌機、温度計、還流コンデ
ンサー付きの別のセパラブルフラスコに上記のエマルシ
ョン490部と水78部を仕込み、28%のアンモニア
水8.5部を撹拌下に添加する。次に内温を85℃に昇
温させ、30分そのまま撹拌を続けた後、重合開始剤と
して、過硫酸アンモニウム0.5部を水5部に溶解した
水溶液を加え、さらに予め水120部、ラウリル硫酸ナ
トリウム0.6部にスチレン297部、アクリロニトリ
ル3部を撹拌下に加えて作成しておいた乳化物を連続的
に90分間かけて添加して反応させ、添加終了後さらに
90分間の熟成を行った。
After completion of the polymerization, 490 parts of the above emulsion and 78 parts of water were charged into another separable flask equipped with a stirrer, a thermometer, and a reflux condenser, and 8.5 parts of 28% ammonia water was added with stirring. . Next, the internal temperature is raised to 85 ° C., and stirring is continued for 30 minutes as it is. Then, an aqueous solution in which 0.5 part of ammonium persulfate is dissolved in 5 parts of water is added as a polymerization initiator, and further 120 parts of water and lauryl are preliminarily added. An emulsion prepared by adding 297 parts of styrene and 3 parts of acrylonitrile to 0.6 part of sodium sulfate with stirring is continuously added over 90 minutes to react, and aging is continued for 90 minutes after the addition is completed. went.

【0023】得られたエマルションは、不揮発分40%
であり、貫通孔を有する直径が0.50μの粒子であっ
た。尚、作製された粒子粉体に関して、JIS K−5
101に準じて吸油量を測定した。試料粉体は、エマル
ションを50℃で24hr乾燥させた後、乳鉢で粉砕、
#150メッシュの濾布で濾過したものを用いた。結果
は吸油量84であった。多孔質樹脂粒子エマルションを
用いて、インクジェット記録シートを作製した。まず以
下の成分からなる固形分40%の水溶液/分散液である
塗工液を作製した。 多孔質樹脂粒子エマルション 125部(固形量50部) UW−90(カオリンクレー) 50部 [EMC(株)製、商品名] ポイズ530(ポリアクリル酸ソーダ系顔料分散剤) [花王(株)製、商品名] 1部(固形量0.4部) MS−3600(燐酸エステル化澱粉) [日本食品工業(株)製、商品名] 5部 ポリラック780A−2(SBRラテックス) [三井東圧化学(株)製、商品名] 24部(固形量12部) 塗工液の調製は、水にポリアクリル酸ソーダ系顔料分散
剤(固形分40%のポイズ530)を加え、カウレスミ
キサーにてカオリンクレーUW−90を十分に分散し、
これに多孔質樹脂粒子として上記のエマルションを添加
する。バインダーとしては燐酸エステル化澱粉MS−3
600、固形分50%のポリラック780A−2を加え
て塗工液とした。この塗工液を市販の上質紙(坪量約5
0g/m2)に、乾燥塗布量が約15g/m2になるよう
にアプリケーターにて塗布し、乾燥条件が120℃、2
0秒で乾燥したものを、キャレンダーロールにてロール
温度60℃、線圧70kg/cm、速度10m/min
の条件にて2回通してインクジェット記録シートを得、
実施例−1として性能評価を行った。
The obtained emulsion has a nonvolatile content of 40%.
And was a particle having a through hole and a diameter of 0.50 μm. Regarding the produced particle powder, JIS K-5
The oil absorption was measured according to 101. The sample powder was dried at 50 ° C. for 24 hours and then pulverized in a mortar.
A filter cloth of # 150 mesh was used. The result was 84 oil absorption. An inkjet recording sheet was produced using the porous resin particle emulsion. First, a coating liquid was prepared which was an aqueous solution / dispersion liquid having a solid content of 40%, which was composed of the following components. Porous resin particle emulsion 125 parts (solid amount 50 parts) UW-90 (kaolin clay) 50 parts [EMC Co., Ltd., trade name] Poise 530 (sodium polyacrylate pigment dispersant) [Kao Co., Ltd.] , Trade name] 1 part (solid content 0.4 part) MS-3600 (phosphoric acid esterified starch) [Nippon Shokuhin Kogyo Co., Ltd., trade name] 5 parts Polylac 780A-2 (SBR latex) [Mitsui Toatsu Chemicals Co., Ltd., trade name] 24 parts (solid amount 12 parts) The coating liquid is prepared by adding a sodium polyacrylate pigment dispersant (Poise 530 having a solid content of 40%) to water and using a Cowles mixer. Kaolin clay UW-90 is well dispersed,
The above emulsion is added to this as porous resin particles. As the binder, phosphoric acid esterified starch MS-3
600 and polylac 780A-2 having a solid content of 50% were added to obtain a coating liquid. Commercially available high-quality paper (basis weight approximately 5
0 g / m 2 ) with an applicator so that the dry coating amount is about 15 g / m 2 , and the drying conditions are 120 ° C. and 2
What was dried in 0 seconds was rolled with a calender roll at a roll temperature of 60 ° C., a linear pressure of 70 kg / cm, and a speed of 10 m / min.
Under the conditions of 2 times to obtain an inkjet recording sheet,
Performance evaluation was performed as Example-1.

【0024】実施例−2 特開平2-70741 号公報の実施例−1に開示されている方
法に準じて多孔質樹脂粒子を作製した。撹拌機、温度
計、還流コンデンサー付きのセパラブルフラスコに水1
00部、ラウリル硫酸ナトリウム0.05部を仕込み、
撹拌化に窒素置換しながら70℃まで昇温する。内温を
70℃に保ち、重合開始剤として、過硫酸カリウム0.
8部を添加し、溶解後、メタクリル酸メチル4部、アク
リル酸ブチル4部、メタクリル酸2部の混合単量体を仕
込み、2時間反応させた。反応終了後、得られた共重合
体エマルションに28%アンモニア水を1.6部(約
1.1モル当量)加え、良く撹拌して中和膨潤して種粒
子とする。
Example-2 Porous resin particles were prepared according to the method disclosed in Example-1 of JP-A-2-70741. Water 1 in a separable flask equipped with stirrer, thermometer and reflux condenser.
00 parts, 0.05 parts of sodium lauryl sulfate were charged,
The temperature is raised to 70 ° C. while substituting nitrogen for stirring. The internal temperature was kept at 70 ° C., and potassium persulfate of 0.
After 8 parts were added and dissolved, a mixed monomer of 4 parts of methyl methacrylate, 4 parts of butyl acrylate and 2 parts of methacrylic acid was charged and reacted for 2 hours. After the completion of the reaction, 1.6 parts (about 1.1 molar equivalent) of 28% ammonia water is added to the obtained copolymer emulsion, and well stirred to neutralize and swell to obtain seed particles.

【0025】続いて重合開始剤として、過硫酸アンモニ
ウム0.5部を水5部に溶解した水溶液を加え、さらに
予め水50部、ラウリル硫酸ナトリウム0.5部にスチ
レン85部、ジビニルベンゼン5部を撹拌下に加えて作
成しておいた乳化物を連続的に4時間かけて添加して反
応させ、添加終了後さらに3時間の熟成を行った。得ら
れたエマルションは、固形分40%、0.1〜0.3μ
の微粒子が集合して出来た形状の、平均粒子径0.9μ
の微粒子集合体粒子エマルションを得た。実施例−1と
同様に吸油量を測定したところ82であった。この多孔
質樹脂粒子エマルションを用いて実施例−1と同様に作
製したインクジェット記録シートを実施例−2として性
能評価を行った。
Then, an aqueous solution prepared by dissolving 0.5 parts of ammonium persulfate in 5 parts of water was added as a polymerization initiator, and further 50 parts of water, 0.5 parts of sodium lauryl sulfate and 85 parts of styrene and 5 parts of divinylbenzene were previously added. The emulsion prepared by adding under stirring was continuously added and reacted for 4 hours, and aging was carried out for 3 hours after completion of the addition. The obtained emulsion has a solid content of 40% and 0.1 to 0.3 μ.
Average particle diameter of 0.9μ
A fine particle aggregate particle emulsion of was obtained. The oil absorption measured in the same manner as in Example-1 was 82. An ink jet recording sheet produced in the same manner as in Example-1 using this porous resin particle emulsion was evaluated as Example-2.

【0026】比較例−1 多孔質でないポリスチレン系樹脂粒子エマルションとし
てミューティクルSPMM−47BF(三井東圧化学
(株)製、商品名;固形分47%;粒子径0.5μ;吸
油量60)を用いて、実施例−1と同様に作製したイン
クジェット記録シートを比較例−1として性能評価を行
った。
Comparative Example-1 Muticle SPMM-47BF (manufactured by Mitsui Toatsu Chemicals, Inc., trade name; solid content 47%; particle size 0.5 μ; oil absorption 60) was used as a non-porous polystyrene resin particle emulsion. An inkjet recording sheet produced in the same manner as in Example-1 was used as Comparative Example-1 for performance evaluation.

【0027】比較例−2 多孔質無機粒子として、微粉末ケイ酸ミズカシルP−5
27(水澤化学工業(株)製、商品名;粒子径1.6
μ;吸油量168)を用いて、実施例−1と同様に作製
したインクジェット記録シートを比較例−2として性能
評価を行った。 比較例−3 基材として使用した上質紙に塗工を行わず、キャレンダ
ー処理のみを施したインクジェット記録シートを比較例
−3として性能評価を行った。
Comparative Example-2 As the porous inorganic particles, fine powder Mizukasil silicate P-5 was used.
27 (manufactured by Mizusawa Chemical Industry Co., Ltd., trade name; particle size 1.6)
μ; oil absorption 168) was used, and an ink jet recording sheet produced in the same manner as in Example-1 was used as Comparative Example-2 for performance evaluation. Comparative Example-3 An inkjet recording sheet, which was not subjected to coating on the high-quality paper used as the base material and only subjected to the calender treatment, was evaluated as Comparative Example-3.

【0028】〔インクジェット記録シートの評価〕上記
の方法で作成したインクジェット記録シートに市販のイ
ンクジェットプリンター(キャノン(株)製、インクは
該プリンター用黒色)で印字し、以下の項目につき5段
階評価した。色濃度はマクベス濃度計で測定した。画像
の鮮明度は目視で官能評価した。乾燥性は印字直後に基
材として用いた紙を印字面に重ね、10g/cm2相当
の重しを1分間乗せた後、重しと紙を取り除き、重ねた
紙への印字の転写を目視で官能評価した。色濃度と鮮明
度は、同じサンプルを印字後5分後と1時間後に評価を
行った。評価結果を表1に示す。優秀な「◎」、良好な
「○」、普通の「△」、使用に問題となる「×」、重大
な欠点のある「××」の5段階に分けた。
[Evaluation of Inkjet Recording Sheet] The inkjet recording sheet prepared by the above method was printed with a commercially available inkjet printer (manufactured by Canon Inc., ink is black for the printer), and the following items were evaluated in 5 grades. . Color density was measured with a Macbeth densitometer. The sharpness of the image was visually evaluated by sensory evaluation. Immediately after printing, stack the paper used as the substrate on the print surface immediately after printing, put a weight equivalent to 10 g / cm 2 for 1 minute, remove the weight and the paper, and visually check the transfer of the print to the stacked paper. It was sensory evaluated. The color density and the sharpness were evaluated 5 minutes and 1 hour after printing the same sample. The evaluation results are shown in Table 1. It was divided into five stages: excellent "◎", good "○", ordinary "△", "×" that causes problems in use, and "XX" that has serious defects.

【0029】[0029]

【表1】 [Table 1]

【0030】[0030]

【発明の効果】本発明のインクジェット記録シートは従
来のもの(紙、フィルム等)に比べ表面部分に於ける単
位体積あたりのインク吸収量が増しているため、より高
解像度、高速度のインクジェット印字に対応できる。ま
た無機系の多孔質粒子を含有させた場合に比して、印字
濃度や鮮明さの経時変化が少なく、軽量で、高速・長期
間印字時に印字機器を傷めないインクジェット記録シー
トを提供できる。
INDUSTRIAL APPLICABILITY The ink jet recording sheet of the present invention has a higher ink absorption amount per unit volume in the surface portion than conventional ones (paper, film, etc.), so that ink jet printing with higher resolution and higher speed can be achieved. Can handle. Further, as compared with the case where inorganic porous particles are contained, it is possible to provide an ink jet recording sheet that has less change in printing density and sharpness with time, is lightweight, and does not damage a printing device at high speed and long term printing.

【手続補正書】[Procedure amendment]

【提出日】平成6年2月15日[Submission date] February 15, 1994

【手続補正1】[Procedure Amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】発明の詳細な説明[Name of item to be amended] Detailed explanation of the invention

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、印刷時の文字の滲みや
裏抜けが少なく、鮮明で高解像度の印刷が可能で、印字
濃度や鮮明さの経時変化が少なく、且つ印字部のインク
の乾燥が速く、未乾燥のインクによる汚損の起こりにく
い、インクジェット印刷用の記録シートに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has little blurring or strike-through of characters at the time of printing, enables clear and high-resolution printing, has little change in printing density and sharpness with time, and is capable of printing ink in a printing portion. The present invention relates to a recording sheet for inkjet printing, which dries quickly and is less likely to be stained by undried ink.

【0002】[0002]

【従来の技術】近年、紙やOHPフィルム等の基材に文
字や画像を印字・印刷する為の色々な技術が提唱されて
いる。これらの技術は多種多様であるが、事務所や一般
家庭に於いて高度な専門知識や技術を要せず、一般的に
普及している印字・印刷技術は多くはない。一般的に普
及した印字・印刷技術の例としては、伝票発行用プリン
ター等に用いられるドット・インパクト方式、個人用ワ
ードプロセッサー等に用いられる熱転写方式、ファクシ
ミリ等に用いられる感熱印字方式、コピー機等に用いら
れる電子写真方式などがあるが、近年最も一般家庭・事
務所等に於いて普及しつつあるものがインクジェット方
式である。
2. Description of the Related Art In recent years, various techniques for printing and printing characters and images on a substrate such as paper and OHP film have been proposed. Although these techniques are diverse, there are not many printing / printing techniques that are widely used without requiring specialized knowledge and techniques in offices and homes. Examples of popular printing / printing technology include dot impact method used in voucher printers, thermal transfer method used in personal word processors, thermal printing method used in facsimiles, and copy machines. Although there are electrophotographic methods and the like used, the inkjet method has become widespread in most homes and offices in recent years.

【0003】インクジェット方式とは、基本的には、水
性、油性或いは溶剤性のインク液滴を微細なノズルより
噴射し、紙等の被印字面に付着させ、文字又は画像とし
ての情報を得る方式である。このインクジェット方式
も、インク液滴の発生方法、インク液滴の付着方法、或
いはインクの種類などから分類されうる様々な方式が提
唱されており、これらの技術を応用したインクジェット
・プリンターが数多く製品化されている。
The ink jet system is basically a system in which water, oil, or solvent ink droplets are ejected from fine nozzles and adhered to a printing surface such as paper to obtain information as characters or images. Is. As for this inkjet method, various methods that can be classified by the method of generating ink droplets, the method of attaching ink droplets, the type of ink, etc. have been proposed, and many inkjet printers that apply these technologies have been commercialized. Has been done.

【0004】インクジェット方式の長所は、他の方式と
比べ、(1)被印字体の形状や種類の制限が少なく、感
熱紙など特別な用紙等を必要としない。また、印字媒体
(インク)の消費は印字部に限って行われ、かつまた印
字媒体の補給は通常インクを補給するだけで良く、更に
特殊な用紙や装置を用いることなく両面印刷が可能であ
り、印字コストが低い。(2)印字時に騒音をほとんど
発せず静粛であり、印字面と印字装置が機械的に接触し
ないので高速印刷が可能である。(3)印字装置が大が
かりでなく小型化が可能であり、装置の消費電力も小さ
い、等が挙げられる。即ち低コスト、静粛、小型の特徴
から、該方式は広く普及している。
The advantages of the ink jet system are (1) there are few restrictions on the shape and type of the printing medium, and no special paper such as thermal paper is required. Further, the consumption of the print medium (ink) is limited to the print section, and the print medium is normally replenished only with the ink, and double-sided printing is possible without using special paper or a device. , Printing cost is low. (2) Quiet with almost no noise during printing, and high-speed printing is possible because the printing surface and the printing device do not mechanically contact each other. (3) The printing device is not large and can be downsized, and the power consumption of the device is small. That is, the method is widely used because of its low cost, quietness, and small size.

【0005】しかしながら、インクジェット方式の短所
としては、液体状態のインクを被印字体に付着させると
いう、該方式の原理より(1)被印字体の表面状態によ
っては、印字の滲みやコントラストのムラが発生しやす
い。(2)印字直後に印字面に手を触れたり、印字済み
の用紙等を重ねたりした場合、未乾燥のインクが付着し
て周辺を汚損し易い、等が挙げられる。近年市場の要請
から、該方式もより高速、高解像度であることを求めら
れている。またカラー印刷等、複数の色のインクを重ね
て印字する事も多くなっている。
However, the disadvantages of the ink jet system are that ink in a liquid state is adhered to a printing medium, and the principle of the system is as follows: (1) Depending on the surface state of the printing medium, bleeding of printing and unevenness of contrast may occur. Likely to happen. (2) When the printed surface is touched immediately after printing, or when printed sheets are overlaid, undried ink adheres and stains the surrounding area. Due to market demands in recent years, the system is also required to have higher speed and higher resolution. In addition, in many cases, such as color printing, inks of a plurality of colors are overlaid and printed.

【0006】インクジェット印字をより高解像度にする
と、印字の大きさの最小単位であるドットの大きさが小
さくなる。これは噴射するインクの量の最小単位が小さ
くなる事でもある。従って被印字体に付着したインクが
被印字体の奥深く浸透する場合、被印字体表層付近の有
効なインク中の顔料・染料の量が減少し、印字のコント
ラストがより顕著に低下する。また、付着したインクが
被印字体の表層付近で横方向に拡がる場合、印字の滲み
となって解像度を低下させる。更に被印字体が薄かった
り、インクが被印字体の奥深くまで浸透すると、被印字
体の裏側に印字が抜き出てくる、いわゆる裏抜けが起こ
り易くなり、特に両面印刷の場合に印字画像の品詞が大
幅に損なわれる。
When the ink jet printing has a higher resolution, the dot size which is the minimum unit of the printing size becomes smaller. This also means that the minimum unit of the amount of ejected ink becomes small. Therefore, when the ink adhering to the printing medium penetrates deep into the printing medium, the amount of pigment / dye in the effective ink near the surface layer of the printing medium decreases, and the printing contrast decreases significantly. Further, when the adhered ink spreads in the lateral direction near the surface layer of the printing medium, it causes bleeding of the printing and lowers the resolution. Furthermore, if the printing target is thin or if the ink penetrates deep into the printing target, the print tends to come out on the back side of the printing target, so-called strike-through easily occurs. Is greatly impaired.

【0007】コントラストの低下と滲みを防止するに
は、被印字体の表面を平滑にし、表層付近の細孔を減少
させる方法があるが、この方法では被印字体へのインク
の吸収が遅くなり、インクの乾燥に時間がかかり、印字
直後の印字部分に触れた物体を汚損したり、得られた印
字や画像情報を損なう事がある。またインクジェット方
式の場合、インクの粘度が低い事が必須であるため、被
印字体へのインクの吸収が遅い場合、噴射されたインク
がはねたり、未乾燥のインクが流れ落ちてしまう事もあ
り、これが印字の滲みの原因となる場合もある。これら
の事は印字の高速化についても障害となる。
In order to prevent the deterioration of contrast and bleeding, there is a method of smoothing the surface of the printing medium and reducing the pores in the vicinity of the surface layer. However, this method slows the absorption of ink into the printing medium. However, it takes a long time to dry the ink, and an object that touches the printed portion immediately after printing may be soiled or the obtained printing or image information may be damaged. Further, in the case of the inkjet method, it is essential that the viscosity of the ink is low. Therefore, when the absorption of the ink to the printing medium is slow, the ejected ink may splash or the undried ink may flow down. However, this may cause blurring of printing. These things also hinder the speeding up of printing.

【0008】またインクジェット方式によるカラー印刷
の場合、複数種のインクが順番に噴射されるので、被印
字体のインク吸収量が少ないと先に噴射された色のイン
クは被付着体に吸収され、後から噴射されたものは吸収
されず表面付近にとどまる。このため、後から噴射され
た色の方がより強く発色される事になり、最終的な色彩
が設定通りにならない事がある。
Further, in the case of color printing by the ink jet system, a plurality of types of inks are ejected in order, so if the ink absorption amount of the printing object is small, the previously ejected color ink is absorbed by the adhesion object, What is injected later is not absorbed and remains near the surface. Therefore, the color ejected later may be more intensely colored, and the final color may not be as set.

【0009】被印字体の表層付近を多孔質化する手段と
してはコロイダルシリカ等の無機多孔質粒子を被印字体
に含有させたり、塗工する方法がある。しかしながら無
機粒子は一般に硬質であり、印字装置の走行系を傷めや
すいと言う問題点がある。また、無機粒子は重量が樹脂
粒子と比して非常に大きいため、無機粒子を使用した被
印字体の重量が大きくなり、また、樹脂粒子を用いた被
印字体と同じ重量にすれば、無機粒子の使用量が減少
し、効果が少なくなると言う問題点があった。
As a means for making the surface of the material to be printed near the surface layer porous, there is a method of incorporating or coating inorganic porous particles such as colloidal silica into the material to be printed. However, the inorganic particles are generally hard and have a problem that the running system of the printing apparatus is easily damaged. Moreover, since the weight of the inorganic particles is much larger than that of the resin particles, the weight of the printing object using the inorganic particles becomes large, and if the same weight as the printing object using the resin particles is used, the inorganic particles are There is a problem that the amount of particles used decreases and the effect decreases.

【0010】[0010]

【発明が解決しようとする課題】本発明の目的は、より
高解像度、高速のインクジェット方式に対応できる、イ
ンクジェット記録シート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 sheet which can be applied to an ink jet system of higher resolution and higher speed.

【0011】[0011]

【課題を解決するための手段】上記問題を解決すべく鋭
意検討を重ねた結果、多孔質樹脂粒子が吸水・吸油性に
優れ、かつ、無機多孔質粒子と比べ軽量、軟質である事
から、本発明を完成させるに至ったものである。即ち、
本発明は、多孔質樹脂粒子を含有する事を特徴とするイ
ンクジェット記録シートである。
[Means for Solving the Problems] As a result of extensive studies to solve the above problems, the porous resin particles are excellent in water absorption and oil absorption, and are lighter and softer than the inorganic porous particles. The present invention has been completed. That is,
The present invention is an ink jet recording sheet characterized by containing porous resin particles.

【0012】本発明に於いて、多孔質樹脂粒子とは、乳
化重合法、懸濁重合法、分散重合法、その他の重合法に
よって得られたもので良く、また塊状の多孔質樹脂を粉
砕したものでも良い。樹脂の成分については例えばポリ
エステル樹脂、メタクリル樹脂、ポリカーボネート樹
脂、スチレン共重合体樹脂、塩化ビニル樹脂、ポリプロ
ピレン樹脂及びこれらのブレンドなど特に限定されな
い。また、該樹脂粒子を多孔質化する、もしくは多孔質
化した樹脂を得る手段についても特に限定されない。そ
のうち、乳化重合によって得られる多孔質樹脂粒子が好
ましく、例えば特開平2-70741 号公報に開示されている
微粒子集合体エマルション粒子が好ましい。更に本発明
者らによる特開平5-222108号記載の乾燥時の構造が粒子
の表層部から内部を結ぶ貫通孔を1個以上有し、且つ粒
子直径が0.1〜5.0μである事を特徴とする多層構
造エマルション粒子ならより好ましい。
In the present invention, the porous resin particles may be those obtained by an emulsion polymerization method, a suspension polymerization method, a dispersion polymerization method or another polymerization method, and a lumpy porous resin is pulverized. Anything is fine. The resin component is not particularly limited, for example, polyester resin, methacrylic resin, polycarbonate resin, styrene copolymer resin, vinyl chloride resin, polypropylene resin and blends thereof. Further, the means for making the resin particles porous or for obtaining the resin made porous is not particularly limited. Among them, porous resin particles obtained by emulsion polymerization are preferable, and for example, fine particle aggregate emulsion particles disclosed in JP-A-2-70741 are preferable. Further, the structure described in Japanese Patent Laid-Open No. 5-222108 by the inventors of the present invention has one or more through holes connecting the surface layer of the particles to the inside thereof, and the particle diameter is 0.1 to 5.0 μm. It is more preferable that the emulsion particles have a multilayer structure.

【0013】該多孔質樹脂粒子の粒子径は、0.05〜
100μ、好ましくは0.1〜50μ、より好ましくは
0.2〜20μである。粒子径0.05μ未満では粒子
を多孔質化する事が困難である。また100μ以上では
被印字体の表面の凹凸が大きくなり、被印字面の平滑性
を著しく損ない、本発明の目的に反する。
The particle size of the porous resin particles is from 0.05 to
It is 100μ, preferably 0.1 to 50μ, and more preferably 0.2 to 20μ. If the particle size is less than 0.05 μ, it is difficult to make the particles porous. On the other hand, when it is 100 μm or more, the unevenness of the surface of the printing object becomes large, and the smoothness of the printing surface is significantly impaired, which is contrary to the object of the present invention.

【0014】該多孔質樹脂粒子が多孔質化されているか
否かは、外見的には電子顕微鏡等を用いて知ることがで
きるが、多孔質化の程度は、水銀ポロシメーターによる
比表面積の測定によって確認することが出来る。またJ
IS K−5101に記載されている吸油量の測定によ
って確認することも出来る。これは粒子表面及び内部に
存在する細孔の毛細管現象により、同成分、同粒径の多
孔質でない粒子よりも多くの油を吸う事を利用してい
る。
Whether or not the porous resin particles have been made porous can be externally known by using an electron microscope or the like. The degree of porosity can be determined by measuring the specific surface area with a mercury porosimeter. You can check. See J
It can also be confirmed by measuring the oil absorption amount described in IS K-5101. This utilizes the fact that it absorbs more oil than non-porous particles of the same component and the same particle size due to the capillarity of the pores existing on the surface and inside the particles.

【0015】一方、多孔質樹脂粒子を含有しなくとも、
例えば未塗工の紙原紙なども多孔質ではある。しかしこ
の場合、その「孔」は紙の繊維同士の隙間であり、多孔
質樹脂粒子の持つ「孔」とは形状も大きさも異なり、ま
た、繊維そのものに於いての単位体積あたりの吸収能
は、多孔質樹脂粒子や無機多孔質粒子と比べて、低い。
従って紙原紙等の場合、付着したインクは繊維同士の隙
間を浸透していくことになり、このため上述した、コン
トラスト低下や滲みや裏抜けを発生させることになる。
On the other hand, even if the porous resin particles are not contained,
For example, uncoated paper base paper is also porous. However, in this case, the "pores" are the gaps between the fibers of the paper, and the shape and size are different from the "pores" of the porous resin particles, and the absorption capacity per unit volume of the fibers themselves is , Lower than porous resin particles and inorganic porous particles.
Therefore, in the case of paper base paper or the like, the adhered ink permeates through the gaps between the fibers, which causes the above-described decrease in contrast, bleeding, and strikethrough.

【0016】またコロイダルシリカ等の無機多孔質粒子
を使用した場合、一般に硬質であることから、印字装置
の走行系を傷めやすく、高速印刷や、長期にわたる使用
において問題がある。また、無機粒子は比重が樹脂粒子
と比して非常に大きいため、無機粒子を使用した被印字
体シートの重量が大きくなり、また、樹脂粒子を用いた
被印字体シートと同じ重量にすれば、無機粒子の使用量
が減少し、効果が少なくなる。さらに、インクの顔料や
染料を固着させる成分は、樹脂粒子と比べ無機粒子との
親和性に乏しく、このためインクが一旦無機粒子に吸収
されても、インクが乾燥・固定される前に毛細管現象に
よって拡散し、コントラスト低下や滲みや裏抜けを発生
させる。
In addition, when inorganic porous particles such as colloidal silica are used, they are generally hard and therefore easily damage the running system of the printing device, which causes problems in high-speed printing and long-term use. In addition, since the specific gravity of the inorganic particles is much larger than that of the resin particles, the weight of the printing object sheet using the inorganic particles becomes large, and if the same weight as the printing object sheet using the resin particles is used, , The amount of inorganic particles used is reduced, and the effect is reduced. In addition, the components that fix the pigments and dyes of the ink have less affinity with the inorganic particles than the resin particles, so even if the ink is once absorbed by the inorganic particles, the capillary phenomenon occurs before the ink is dried and fixed. Diffuses and causes contrast deterioration, bleeding, and strikethrough.

【0017】このように、多孔質樹脂粒子を被印字体シ
ート中に含有させれば、該シートのインク吸収能は著し
く向上し、その効果は無機粒子を上回る。多孔質樹脂粒
子を含有させるシート基材としては、パルプ及びパルプ
を主原料にした紙、再生紙、合成紙、ポリオレフィンや
ポリエステル等を主原料にしたフィルムなどが挙げられ
るが特に限定はされない。また、これらシートには必要
に応じてラテックスを含侵させたり、耐水化剤や紙力増
強剤を内添したり、サイズプレスを行ったり、蛍光剤や
白色顔料を添加するなど、従来のシートと同様な処理・
高付加価値化を行って良く、特に制限はない。
As described above, when the porous resin particles are contained in the sheet to be printed, the ink absorbing ability of the sheet is remarkably improved, and the effect is superior to the inorganic particles. Examples of the sheet base material containing the porous resin particles include, but are not particularly limited to, pulp and pulp-based paper, recycled paper, synthetic paper, and films based on polyolefin and polyester. In addition, if necessary, latex may be impregnated into these sheets, a waterproofing agent or a paper strengthening agent may be internally added, size press may be performed, and a fluorescent agent or a white pigment may be added to the sheet. Processing similar to
There is no particular limitation as long as the added value is increased.

【0018】多孔質樹脂粒子を被印字体シートに含有さ
せる方法は、バインダーと共にシート基材に塗工するほ
か、シート基材に内添したり、溶融したシート基材原料
と共に成形・フィルム化しても良く、特に限定されない
が、紙をシート基材としてその表面にバインダーと共に
塗工するのが好ましい。該シート基材に塗工を行う場
合、使用するバインダーや他の顔料等の添加剤の種類や
量及び塗工方法については一般的な塗工紙と同じでよ
く、特に制限はない。内添や成形等によってシート基材
に含有させる場合も従来の樹脂粒子を含有させる方法と
同じでよく、また組み合わせて用いる添加剤等も同様に
用いることができる。シート基材の厚みは印字装置の仕
様に適合していれば良く特に制限はないが、1mm〜1
μmが好ましく、0.1〜10μmならばより好まし
い。
The method for incorporating the porous resin particles into the sheet to be printed is to coat the sheet base material with a binder, add it internally to the sheet base material, or form / film with the molten sheet base material. Although it is not particularly limited, it is preferable to coat paper with a binder as a sheet base material on the surface thereof. When the sheet base material is coated, the type and amount of the binder and other additives such as other pigments to be used and the coating method may be the same as those for general coated paper, and there is no particular limitation. When it is contained in the sheet base material by internal addition or molding, it may be the same as the conventional method of containing the resin particles, and the additive or the like used in combination may be similarly used. The thickness of the sheet base material is not particularly limited as long as it conforms to the specifications of the printing device, but is 1 mm to 1
μm is preferable, and 0.1 to 10 μm is more preferable.

【0019】シート基材に含有させる該多孔質粒子の量
は、多いほど吸油能の効果が大である。しかしながら、
シート基材全体100部に対し5〜80重量部、好まし
くは10〜50重量含有させるのがよい。含有量が5重
量部未満では効果が少なく、80重量部以上含有させる
と、基材の強度が極端に低下し実用的でない。ただし、
シート基材上に塗工する場合、該粒子が塗工層のみに存
在するので、基材の強度を考慮する必要が無く、また、
シート表面付近に存在する有効な粒子の数が増大するの
でより効果的である。従って塗工の場合、塗工層全体の
重量100部に対し1〜95重量部、好ましくは5〜6
0重量部含有させればよい。含有量が1重量部未満では
効果が少なく、95重量部以上含有させると、塗工層の
強度が極端に低下し実用的でない。また塗工層の厚みも
しくは塗工重量は一般的な塗工紙と同じでよいが、5〜
100μもしくは1〜50g/m2が好ましい。
The larger the amount of the porous particles contained in the sheet base material, the greater the effect of oil absorption. However,
It is preferable to add 5 to 80 parts by weight, preferably 10 to 50 parts by weight, based on 100 parts of the entire sheet base material. If the content is less than 5 parts by weight, the effect is small, and if the content is 80 parts by weight or more, the strength of the base material is extremely lowered, which is not practical. However,
When coating on a sheet substrate, since the particles are present only in the coating layer, it is not necessary to consider the strength of the substrate,
It is more effective because the number of effective particles existing near the sheet surface is increased. Therefore, in the case of coating, 1 to 95 parts by weight, preferably 5 to 6 parts by weight based on 100 parts by weight of the entire coating layer is applied.
It may be contained in an amount of 0 parts by weight. If the content is less than 1 part by weight, the effect is small, and if the content is 95 parts by weight or more, the strength of the coating layer is extremely reduced, which is not practical. The thickness or coating weight of the coating layer may be the same as that of general coated paper, but
100 μ or 1 to 50 g / m 2 is preferable.

【0020】[0020]

【実施例】以下、本発明の具体的な実施例について説明
する。なお、部及び%は総て重量部及び重量%を示す。 〔インクジェット記録シートの作製〕 実施例−1 特開平5-222108号公報の重合例−1に開示されている方
法に準じて多孔質樹脂粒子を作製した。撹拌機、温度
計、還流コンデンサー付きのセパラブルフラスコに水2
500部を仕込み、撹拌化に窒素置換しながら80℃ま
で昇温する。内温を80℃に保ち、重合開始剤として、
過硫酸カリウム1.5部を添加し、溶解後、予め水7
部、ラウリル硫酸ナトリウム0.2部にスチレン16
部、メタクリル酸0.3部、ジビニルベンゼン0.2部
を撹拌下に加えて作成した乳化物をセパラブルフラスコ
内に仕込み、1時間重合させ、種粒子エマルションを作
製した。次に予め水40部、ラウリル硫酸ナトリウム
0.3部にメタクリル酸メチル55部、アクリル酸ブチ
ル5部、メタクリル酸40部を撹拌下に加えて作成した
乳化物を連続的に1時間かけて添加して反応させ、添加
終了後1時間の熟成を行った。
EXAMPLES Specific examples of the present invention will be described below. All parts and% are parts by weight and% by weight. [Preparation of Inkjet Recording Sheet] Example-1 Porous resin particles were prepared according to the method disclosed in Polymerization Example-1 of JP-A-5-222108. Water in a separable flask equipped with a stirrer, thermometer and reflux condenser.
500 parts are charged, and the temperature is raised to 80 ° C. while substituting nitrogen for stirring. Keeping the internal temperature at 80 ℃, as a polymerization initiator,
After adding 1.5 parts of potassium persulfate and dissolving, water 7
Parts, styrene 16 to 0.2 parts sodium lauryl sulfate
Parts, 0.3 parts of methacrylic acid, and 0.2 parts of divinylbenzene were added with stirring to prepare an emulsion, which was charged in a separable flask and polymerized for 1 hour to prepare a seed particle emulsion. Next, an emulsion prepared by previously adding 40 parts of water, 0.3 part of sodium lauryl sulfate to 55 parts of methyl methacrylate, 5 parts of butyl acrylate, and 40 parts of methacrylic acid was continuously added over 1 hour. The reaction was carried out, and aging was carried out for 1 hour after the addition was completed.

【0021】続いて重合開始剤として、過硫酸アンモニ
ウム3部を水30部に溶解した水溶液を加え、さらに予
め水240部、ラウリル硫酸ナトリウム1.2部にメタ
クリル酸メチル468部、アクリル酸ブチル120部、
メタクリル酸12部を撹拌下に加えて作成した乳化物を
連続的に1時間かけて添加して反応させ、添加終了後さ
らに2時間の熟成を行った。
Subsequently, as a polymerization initiator, an aqueous solution prepared by dissolving 3 parts of ammonium persulfate in 30 parts of water was added, and further 240 parts of water, 1.2 parts of sodium lauryl sulfate, 468 parts of methyl methacrylate, and 120 parts of butyl acrylate. ,
An emulsion prepared by adding 12 parts of methacrylic acid with stirring was continuously added over 1 hour to cause a reaction, and aging was continued for 2 hours after the addition was completed.

【0022】重合終了後、撹拌機、温度計、還流コンデ
ンサー付きの別のセパラブルフラスコに上記のエマルシ
ョン490部と水78部を仕込み、28%のアンモニア
水8.5部を撹拌下に添加する。次に内温を85℃に昇
温させ、30分そのまま撹拌を続けた後、重合開始剤と
して、過硫酸アンモニウム0.5部を水5部に溶解した
水溶液を加え、さらに予め水120部、ラウリル硫酸ナ
トリウム0.6部にスチレン297部、アクリロニトリ
ル3部を撹拌下に加えて作成しておいた乳化物を連続的
に90分間かけて添加して反応させ、添加終了後さらに
90分間の熟成を行った。
After completion of the polymerization, 490 parts of the above emulsion and 78 parts of water were charged into another separable flask equipped with a stirrer, a thermometer, and a reflux condenser, and 8.5 parts of 28% ammonia water was added with stirring. . Next, the internal temperature is raised to 85 ° C., and stirring is continued for 30 minutes as it is. Then, an aqueous solution in which 0.5 part of ammonium persulfate is dissolved in 5 parts of water is added as a polymerization initiator, and further 120 parts of water and lauryl are preliminarily added. An emulsion prepared by adding 297 parts of styrene and 3 parts of acrylonitrile to 0.6 part of sodium sulfate with stirring is continuously added over 90 minutes to react, and aging is continued for 90 minutes after the addition is completed. went.

【0023】実施例−2 撹拌機、温度計、還流コンデンサー付きのセパラブルフ
ラスコに水2500部を仕込み、撹拌化に窒素置換しな
がら80℃まで昇温する。内温を80℃に保ち、重合開
始剤として過硫酸カリウム1.5部を添加し、溶解後、
予め水7部、ラウリル硫酸ナトリウム0.2部にスチレ
ン16部、メタクリル酸0.3部、ジビニルベンゼン
0.2部を撹拌下に加えて作成した乳化物をセパラブル
フラスコ内に仕込み1時間重合させ、種粒子エマルショ
ンを作製した。次に予め水40部、ラウリル硫酸ナトリ
ウム0.3部にメタクリル酸メチル45部、アクリル酸
ブチル5部、メタクリル酸50部を撹拌下に加えて作成
した乳化物を連続的に1時間かけて添加して反応させ、
添加終了後1時間の熟成を行った。続いて重合開始剤と
して、過硫酸アンモニウム1.5部を水15部に溶解し
た水溶液を加え、さらに予め水160部、ラウリル硫酸
ナトリウム0.8部にメタクリル酸メチル312部、ア
クリル酸ブチル80部、メタクリル酸8部を撹拌下に加
えて作成した乳化物を連続的に2時間かけて添加して反
応させ、添加終了後さらに2時間の熟成を行った。
Example-2 2500 parts of water was charged into a separable flask equipped with a stirrer, a thermometer and a reflux condenser, and the temperature was raised to 80 ° C. while substituting nitrogen for stirring. Keep the internal temperature at 80 ° C, add 1.5 parts of potassium persulfate as a polymerization initiator, and after dissolution,
An emulsion prepared by previously adding 7 parts of water, 0.2 part of sodium lauryl sulfate to 16 parts of styrene, 0.3 part of methacrylic acid and 0.2 part of divinylbenzene was charged in a separable flask and polymerized for 1 hour. Then, a seed particle emulsion was prepared. Next, an emulsion prepared by previously adding 45 parts of methyl methacrylate, 5 parts of butyl acrylate, and 50 parts of methacrylic acid to 40 parts of water and 0.3 part of sodium lauryl sulfate under stirring was continuously added over 1 hour. To react,
After completion of the addition, aging was carried out for 1 hour. Subsequently, an aqueous solution in which 1.5 parts of ammonium persulfate was dissolved in 15 parts of water was added as a polymerization initiator, and further 160 parts of water, 0.8 parts of sodium lauryl sulfate, 312 parts of methyl methacrylate, 80 parts of butyl acrylate, An emulsion prepared by adding 8 parts of methacrylic acid with stirring was continuously added over 2 hours to cause a reaction, and aging was continued for 2 hours after the addition was completed.

【0024】重合終了後、撹拌機、温度計、還流コンデ
ンサー付きの別のセパラブルフラスコに上記のエマルシ
ョン625部(固形分100部相当)と水279部を仕
込み、28%のアンモニア水7部を撹拌下に添加する。
次に内温を85℃に昇温させ、30分そのまま撹拌を続
けた後、重合開始剤として過硫酸アンモニウム0.5部
を水5部に溶解した水溶液を加え、さらに予め水120
部、ラウリル硫酸ナトリウム0.6部にスチレン297
部、アクリロニトリル3部を撹拌下に加えて作成してお
いた乳化物を連続的に90分間かけて添加して反応さ
せ、添加終了後さらに90分間の熟成を行った。得られ
たエマルションは、不揮発分30%であり、貫通孔を有
する直径が0.7μの粒子であった。実施例−1と同様
に吸油量を測定したところ150であった。この多孔質
樹脂粒子エマルションを用いて、実施例−1と同様に作
製したインクジェット記録シートを実施例−2として性
能評価を行った。
After completion of the polymerization, 625 parts of the above emulsion (equivalent to 100 parts of solid content) and 279 parts of water were charged into another separable flask equipped with a stirrer, a thermometer and a reflux condenser, and 7 parts of 28% ammonia water was added. Add with stirring.
Next, the internal temperature is raised to 85 ° C., and stirring is continued for 30 minutes as it is. Then, an aqueous solution in which 0.5 part of ammonium persulfate is dissolved in 5 parts of water as a polymerization initiator is added, and water 120
Parts, 0.6 parts of sodium lauryl sulfate and styrene 297
And acrylonitrile (3 parts) were added under stirring, and the emulsion prepared was continuously added over 90 minutes to cause a reaction, and after the addition was completed, aging was performed for 90 minutes. The obtained emulsion had a nonvolatile content of 30% and was a particle having a through hole and a diameter of 0.7 μm. The oil absorption measured in the same manner as in Example-1 was 150. Using this porous resin particle emulsion, an inkjet recording sheet produced in the same manner as in Example-1 was evaluated as Example-2 for performance evaluation.

【0025】実施例−3 特開平2-70741 号公報の実施例−1に開示されている方
法に準じて多孔質樹脂粒子を作製した。撹拌機、温度
計、還流コンデンサー付きのセパラブルフラスコに水1
00部、ラウリル硫酸ナトリウム0.05部を仕込み、
撹拌化に窒素置換しながら70℃まで昇温する。内温を
70℃に保ち、重合開始剤として、過硫酸カリウム0.
8部を添加し、溶解後、メタクリル酸メチル4部、アク
リル酸ブチル4部、メタクリル酸2部の混合単量体を仕
込み、2時間反応させた。反応終了後、得られた共重合
体エマルションに28%アンモニア水を1.6部(約
1.1モル当量)加え、良く撹拌して中和膨潤して種粒
子とする。この多孔質樹脂粒子エマルションを用いて実
施例−1と同様に作製したインクジェット記録シートを
実施例−2として性能評価を行った。
Example-3 Porous resin particles were prepared according to the method disclosed in Example-1 of JP-A-2-70741. Water 1 in a separable flask equipped with stirrer, thermometer and reflux condenser.
00 parts, 0.05 parts of sodium lauryl sulfate were charged,
The temperature is raised to 70 ° C. while substituting nitrogen for stirring. The internal temperature was kept at 70 ° C., and potassium persulfate of 0.
After 8 parts were added and dissolved, a mixed monomer of 4 parts of methyl methacrylate, 4 parts of butyl acrylate and 2 parts of methacrylic acid was charged and reacted for 2 hours. After the completion of the reaction, 1.6 parts (about 1.1 molar equivalent) of 28% ammonia water is added to the obtained copolymer emulsion, and well stirred to neutralize and swell to obtain seed particles. An ink jet recording sheet produced in the same manner as in Example-1 using this porous resin particle emulsion was evaluated as Example-2.

【0026】比較例−1 多孔質でないポリスチレン系樹脂粒子エマルションとし
てミューティクルPP100P(三井東圧化学(株)
製、商品名;固形分43%;粒子径0.6μ;吸油量4
5)を用いて、実施例−1と同様に作製したインクジェ
ット記録シートを比較例−1として性能評価を行った。
Comparative Example-1 Muticle PP100P (Mitsui Toatsu Chemicals, Inc.) was used as a non-porous polystyrene resin particle emulsion.
Product name: Solid content 43%; Particle size 0.6μ; Oil absorption 4
Using 5), the ink jet recording sheet produced in the same manner as in Example-1 was evaluated as Comparative Example-1.

【0027】比較例−2 多孔質無機粒子として、微粉末ケイ酸ミズカシルP−5
27(水澤化学工業(株)製、商品名;粒子径1.6
μ;吸油量168)を用いて、実施例−1と同様に作製
したインクジェット記録シートを比較例−2として性能
評価を行った。 比較例−3 基材として使用した上質紙に塗工を行わず、キャレンダ
ー処理のみを施したインクジェット記録シートを比較例
−3として性能評価を行った。
Comparative Example-2 As the porous inorganic particles, fine powder Mizukasil silicate P-5 was used.
27 (manufactured by Mizusawa Chemical Industry Co., Ltd., trade name; particle size 1.6)
μ; oil absorption 168) was used, and an ink jet recording sheet produced in the same manner as in Example-1 was used as Comparative Example-2 for performance evaluation. Comparative Example-3 An inkjet recording sheet, which was not subjected to coating on the high-quality paper used as the base material and only subjected to the calender treatment, was evaluated as Comparative Example-3.

【0028】色濃度はマクベス濃度計で測定した。裏抜
けは印字後の紙の裏側に於いて色濃度の測定をして評価
した。画像の鮮明度は目視で官能評価した。乾燥性は印
字直後に基材として用いた紙を印字面に重ね、10g/
cm2相当の重しを1分間乗せた後、重しと紙を取り除
き、重ねた紙への印字の転写を目視で官能評価した。色
濃度と鮮明度は、同じサンプルを印字後5分後と1時間
後に評価を行った。評価結果を表1に示す。優秀な
「◎」、良好な「○」、普通の「△」、使用に問題とな
る「×」、重大な欠点のある「××」の5段階に分け
た。
Color density was measured with a Macbeth densitometer. The strike-through was evaluated by measuring the color density on the back side of the printed paper. The sharpness of the image was visually evaluated by sensory evaluation. Immediately after printing, stack the paper used as the substrate on the printed surface immediately after printing, 10 g /
After applying a weight corresponding to cm 2 for 1 minute, the weight and the paper were removed, and the transfer of the print to the overlapped paper was visually sensory evaluated. The color density and the sharpness were evaluated 5 minutes and 1 hour after printing the same sample. The evaluation results are shown in Table 1. It was divided into five stages: excellent "◎", good "○", ordinary "△", "×" that causes problems in use, and "XX" that has serious defects.

【0029】[0029]

【表1】 [Table 1]

【0030】[0030]

【発明の効果】本発明のインクジェット記録シートは従
来のもの(紙、フィルム等)に比べ表面部分に於ける単
位体積あたりのインク吸収量が増しているため、裏抜け
が起こりにくく、より高解像度、高速度のインクジェッ
ト印字に対応できる。また無機系の多孔質粒子を含有さ
せた場合に比して、印字濃度や鮮明さの経時変化が少な
く、軽量で、高速・長期間印字時に印字機器を傷めない
インクジェット記録シートを提供できる。
EFFECTS OF THE INVENTION The ink jet recording sheet of the present invention has a higher ink absorption amount per unit volume in the surface portion than conventional ones (paper, film, etc.). It can be used for high-speed inkjet printing. Further, as compared with the case where inorganic porous particles are contained, it is possible to provide an ink jet recording sheet that has less change in printing density and sharpness with time, is lightweight, and does not damage a printing device at high speed and long term printing.

Claims (3)

    【特許請求の範囲】[Claims]
  1. 【請求項1】多孔質樹脂粒子を含有する事を特徴とする
    インクジェット記録シート。
    1. An ink jet recording sheet containing porous resin particles.
  2. 【請求項2】多孔質樹脂粒子を含有する塗工層を有し、
    且つ該塗工層を支持する基材から形成される事を特徴と
    する請求項1記載のインクジェット記録シート。
    2. A coating layer containing porous resin particles,
    The inkjet recording sheet according to claim 1, wherein the inkjet recording sheet is formed of a base material that supports the coating layer.
  3. 【請求項3】乾燥時の構造が粒子の表層部から内部を結
    ぶ貫通孔を1個以上有し、且つ粒子直径が0.15〜
    5.0μである多層構造エマルション粒子を塗工層に含
    有する事を特徴とする請求項1乃至2記載のインクジェ
    ット記録シート。
    3. The structure when dried has at least one through hole connecting the surface layer of the particle to the inside thereof, and the particle diameter is 0.15 to 0.15.
    The inkjet recording sheet according to claim 1, wherein the coating layer contains multi-layered emulsion particles having a size of 5.0 μm.
JP5321717A 1993-12-21 1993-12-21 Ink-jet recording sheet Pending JPH07172037A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5321717A JPH07172037A (en) 1993-12-21 1993-12-21 Ink-jet recording sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5321717A JPH07172037A (en) 1993-12-21 1993-12-21 Ink-jet recording sheet

Publications (1)

Publication Number Publication Date
JPH07172037A true JPH07172037A (en) 1995-07-11

Family

ID=18135661

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5321717A Pending JPH07172037A (en) 1993-12-21 1993-12-21 Ink-jet recording sheet

Country Status (1)

Country Link
JP (1) JPH07172037A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6328443B1 (en) 2000-06-30 2001-12-11 Eastman Kodak Company Ink jet printing method
EP1167057A2 (en) * 2000-06-30 2002-01-02 Eastman Kodak Company Ink jet printing method
JP2002052820A (en) * 2000-06-30 2002-02-19 Eastman Kodak Co Ink jet recording element
US6475602B1 (en) 2000-06-30 2002-11-05 Eastman Kodak Company Ink jet recording element

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6328443B1 (en) 2000-06-30 2001-12-11 Eastman Kodak Company Ink jet printing method
EP1167057A2 (en) * 2000-06-30 2002-01-02 Eastman Kodak Company Ink jet printing method
JP2002052820A (en) * 2000-06-30 2002-02-19 Eastman Kodak Co Ink jet recording element
EP1167057A3 (en) * 2000-06-30 2002-10-30 Eastman Kodak Company Ink jet printing method
US6475602B1 (en) 2000-06-30 2002-11-05 Eastman Kodak Company Ink jet recording element
US6492006B1 (en) 2000-06-30 2002-12-10 Eastman Kodak Company Ink jet recording element
US6528147B1 (en) 2000-06-30 2003-03-04 Eastman Kodak Company Ink jet printing method

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