JPH06316145A - Recording sheet and recorded matter - Google Patents
Recording sheet and recorded matterInfo
- Publication number
- JPH06316145A JPH06316145A JP5096966A JP9696693A JPH06316145A JP H06316145 A JPH06316145 A JP H06316145A JP 5096966 A JP5096966 A JP 5096966A JP 9696693 A JP9696693 A JP 9696693A JP H06316145 A JPH06316145 A JP H06316145A
- Authority
- JP
- Japan
- Prior art keywords
- acid
- recording sheet
- receiving layer
- porous
- aromatic nucleus
- 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.)
- Granted
Links
Landscapes
- Ink Jet Recording Methods And Recording Media Thereof (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、記録用シートおよび記
録物に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording sheet and recorded matter.
【0002】[0002]
【従来の技術】インクジェット方式、静電転写方式、昇
華型熱転写方式等の各種プリンターを用いて画像を形成
することが多くなっている。この場合、普通の紙では、
十分な吸収性や解像度が得られず、また透明なものが得
られないので、例えば、特開平2−276670号等の
ように、基材に無機の多孔質層を形成した記録用シート
が提案されている。2. Description of the Related Art Images are often formed using various printers such as an ink jet system, an electrostatic transfer system, and a sublimation type thermal transfer system. In this case, on plain paper,
Since sufficient absorbency and resolution cannot be obtained and a transparent material cannot be obtained, a recording sheet in which an inorganic porous layer is formed on a substrate is proposed, for example, as in JP-A-2-276670. Has been done.
【0003】[0003]
【発明が解決しようとする課題】上記のように、インク
の吸収性が良好で、かつ、色素の定着性の良好な多孔質
層を有する記録用シートにあっては、保存中に樹脂の可
塑剤のようなものまで吸着し、変色をきたす場合があっ
た。本発明は、インクの吸収性が良好で、かつ、色素の
定着性の良好な記録用シートであって、長期の保存でも
変色のない記録用シートを得ることを目的とする。As described above, in a recording sheet having a porous layer having good ink absorbability and good dye fixing property, the plasticization of resin during storage is required. In some cases, even substances such as agents were adsorbed, causing discoloration. It is an object of the present invention to obtain a recording sheet which has good ink absorbability and good dye fixing property and which does not discolor even after long-term storage.
【0004】[0004]
【課題を解決するための手段】本発明は、基材上に、芳
香核を有する有機酸を含有する多孔質インク受理層を有
する記録用シートを提供するものである。SUMMARY OF THE INVENTION The present invention provides a recording sheet having a porous ink receiving layer containing an organic acid having an aromatic nucleus on a substrate.
【0005】芳香核を有する有機酸としては、芳香核に
カルボン酸基またはスルホン酸基が結合した有機酸が好
ましい。芳香核としては、溶解性などの点からベンゼン
核が好ましい。具体的には、フタル酸(o−ジカルボキ
シベンゼン)、イソフタル酸(m−ジカルボキシベンゼ
ン)、テレフタル酸(p−ジカルボキシベンゼン)、安
息香酸、サリチル酸、ベンゼンスルホン酸、フェニル酢
酸などがあげられる。ジカルボン酸については、その一
部または全部が無水物化していてもよい。The organic acid having an aromatic nucleus is preferably an organic acid having a carboxylic acid group or a sulfonic acid group bonded to the aromatic nucleus. As the aromatic nucleus, a benzene nucleus is preferable from the viewpoint of solubility and the like. Specific examples include phthalic acid (o-dicarboxybenzene), isophthalic acid (m-dicarboxybenzene), terephthalic acid (p-dicarboxybenzene), benzoic acid, salicylic acid, benzenesulfonic acid and phenylacetic acid. . Part or all of the dicarboxylic acid may be anhydride.
【0006】芳香核を有する有機酸は、塩の形で存在し
ていてもよい。塩としては、水溶液が酸性であるような
塩が好ましい。このような塩としてジカルボン酸のカル
ボキシル基の水素の一部がカチオンで置換した塩があげ
られる。このときのカチオンとしては、アルカリ金属イ
オンまたはアンモニウムイオンが好ましい。The organic acid having an aromatic nucleus may be present in the form of a salt. The salt is preferably such that the aqueous solution is acidic. An example of such a salt is a salt in which a part of hydrogen of the carboxyl group of dicarboxylic acid is replaced with a cation. At this time, the cation is preferably an alkali metal ion or an ammonium ion.
【0007】多孔質インク受理層に、芳香核を有する有
機酸を付与する方法としては、あらかじめ形成した多孔
質インク受理層に、芳香核を有する有機酸を適当な溶媒
に溶解した溶液を浸漬法またはスプレー法などで付与す
る方法が好ましく採用される。あるいは、多孔質インク
受理層を形成する原料に芳香核を有する有機酸を混合し
ておく方法なども採用することができる。多孔質インク
受理層に溶液を付与する方法において、溶媒は有機酸の
溶解度に応じて適宜選択することができる。芳香核を有
する有機酸を塩の形で用いる場合には、水を溶媒として
使用することが容易になるという利点がある。As a method for imparting an organic acid having an aromatic nucleus to the porous ink receiving layer, a solution in which an organic acid having an aromatic nucleus is dissolved in a suitable solvent is immersed in a preformed porous ink receiving layer. Alternatively, a method of applying by a spray method or the like is preferably adopted. Alternatively, a method in which an organic acid having an aromatic nucleus is mixed with a raw material for forming the porous ink receiving layer can also be adopted. In the method of applying the solution to the porous ink receiving layer, the solvent can be appropriately selected depending on the solubility of the organic acid. When the organic acid having an aromatic nucleus is used in the form of a salt, there is an advantage that water can be easily used as a solvent.
【0008】芳香核を有する有機酸の含有量としては、
多孔質インク受理層の重量を基準として0.05〜7.
5重量%であることが好ましい。芳香核を有する有機酸
の含有量が0.05重量%に満たない場合は、本願発明
の効果が十分発現せず、記録用シートの変色が起こるお
それがあるので好ましくない。芳香核を有する有機酸の
含有量が7.5重量%を超える場合は、それ以上変色を
抑制する効果が増大しないばかりか、多孔質層の吸収性
を阻害するおそれがあるので好ましくない。より好まし
い有機酸の含有量は、0.5〜5.5重量%である。As the content of the organic acid having an aromatic nucleus,
0.05 to 7. Based on the weight of the porous ink receiving layer.
It is preferably 5% by weight. When the content of the organic acid having an aromatic nucleus is less than 0.05% by weight, the effect of the present invention is not sufficiently exhibited, and the discoloration of the recording sheet may occur, which is not preferable. When the content of the organic acid having an aromatic nucleus exceeds 7.5% by weight, not only the effect of suppressing discoloration does not increase, but also the absorptivity of the porous layer may be impaired, which is not preferable. The more preferable content of the organic acid is 0.5 to 5.5% by weight.
【0009】本発明において、多孔質インク受理層は、
記録の際にインクを吸収し定着し得る多孔質層である。
多孔質インク受理層の厚さは、薄すぎると色素を十分担
持できず、色濃度の低い印刷物しか得られないおそれが
あるので好ましくなく、逆に厚すぎると多孔質インク受
理層の強度が低下したり、あるいは透明性が減少して印
刷物の透明性あるいは質感が損なわれるおそれがあるの
で好ましくない。多孔質インク受理層の好ましい厚さ
は、1〜50μmである。In the present invention, the porous ink receiving layer is
It is a porous layer capable of absorbing and fixing ink during recording.
If the thickness of the porous ink receiving layer is too thin, it may not be able to sufficiently carry the dye, and only a printed matter with a low color density may be obtained, which is not preferable, and if it is too thick, the strength of the porous ink receiving layer will decrease. Or the transparency may be reduced to impair the transparency or texture of the printed matter, which is not preferable. The preferable thickness of the porous ink receiving layer is 1 to 50 μm.
【0010】多孔質インク受理層は、無機粒子を好まし
くはバインダーで結合した構成が好ましい。無機粒子の
材質としては、シリカまたはアルミナあるいはそれらの
水和物が好ましい。特に、擬ベーマイト多孔質層は、吸
収性が良好であるとともに、色素を選択的によく吸着す
るため、各種の記録方式を用いて、色濃度が高く鮮明な
記録物が得られるので好ましい。ここで、擬ベーマイト
は、AlOOHの組成式で表されるアルミナ水和物であ
り、細孔構造を有する凝集体である。The porous ink receiving layer preferably has a structure in which inorganic particles are bound by a binder. As a material for the inorganic particles, silica, alumina or a hydrate thereof is preferable. In particular, the pseudo-boehmite porous layer is preferable because it has good absorbability and selectively and well adsorbs the dye, and thus various recording methods can be used to obtain a clear recorded matter with high color density. Here, pseudo-boehmite is an alumina hydrate represented by the composition formula of AlOOH, and is an aggregate having a pore structure.
【0011】多孔質層が擬ベーマイトである場合には、
有機酸は擬ベーマイト1モルあたり、0.2〜30ミリ
モルであることが好ましい。より好ましい範囲は、1〜
20ミリモルである。When the porous layer is pseudo-boehmite,
The organic acid is preferably 0.2 to 30 mmol per mol of pseudoboehmite. A more preferable range is 1 to
20 mmol.
【0012】擬ベーマイト多孔質層は、その細孔構造が
実質的に半径が10〜100Åの細孔からなり、細孔容
積が0.3〜1.0cc/gである場合は、十分な吸収
性を有しかつ透明性もあるので好ましい。このとき、基
材が透明であれば、記録用シートも透明なものが得られ
る。基材が不透明である場合には、基材の質感を損なわ
ずに必要とされる物性を付与することが可能である。こ
れらの物性に加え、擬ベーマイト多孔質層の平均細孔半
径が30〜70Åである場合はさらに好ましい。なお、
細孔径分布の測定は、窒素吸脱着法による。The pseudo-boehmite porous layer has a pore structure whose pores are substantially composed of pores having a radius of 10 to 100Å and has a pore volume of 0.3 to 1.0 cc / g. It is preferable because it has properties and is transparent. At this time, if the base material is transparent, a transparent recording sheet can be obtained. When the substrate is opaque, it is possible to impart the required physical properties without impairing the texture of the substrate. In addition to these physical properties, it is further preferable that the pseudo-boehmite porous layer has an average pore radius of 30 to 70Å. In addition,
The pore size distribution is measured by the nitrogen adsorption / desorption method.
【0013】上記のような細孔構造を有する擬ベーマイ
ト多孔質層を製造するには、アルミニウムのアルコキシ
ドを加水分解して得たベーマイトゾルを用いるのが好ま
しい。基材上に塗布する手段は、ベーマイトゾルに、好
ましくはバインダーを加えてスラリー状とし、ロールコ
ーター、エアナイフコーター、ブレードコーター、ロッ
ドコーター、バーコーターなどを用いて基材上に塗布
し、乾燥する方法を好ましく採用することができる。In order to produce a pseudo-boehmite porous layer having a pore structure as described above, it is preferable to use a boehmite sol obtained by hydrolyzing an aluminum alkoxide. The means for applying on the base material is a boehmite sol, preferably a binder is added to form a slurry, which is applied onto the base material using a roll coater, an air knife coater, a blade coater, a rod coater, a bar coater, etc., and dried. The method can be preferably adopted.
【0014】バインダーとしては、でんぷんやその変性
物、ポリビニルアルコールおよびその変性物、SBRラ
テックス、NBRラテックス、ヒドロキシセルロース、
ポリビニルピロリドン等の有機物を用いることができ
る。バインダーの使用量は、少ないと多孔質インク受理
層の強度が不十分になるおそれがあり、逆に多すぎると
インクの吸収量や色素の担持量が低くなるおそれがある
ので、無機粒子の5〜50重量%程度が好ましい。As the binder, starch and its modified products, polyvinyl alcohol and its modified products, SBR latex, NBR latex, hydroxycellulose,
Organic substances such as polyvinylpyrrolidone can be used. If the amount of the binder used is too small, the strength of the porous ink-receiving layer may be insufficient. On the contrary, if the amount is too large, the amount of ink absorbed and the amount of dye supported may be low. It is preferably about 50% by weight.
【0015】本発明において、基材としては種々のもの
を使用することができる。例えば、ポリエチレンテレフ
タレート等のポリエステル、ポリカーボネート、ETF
E等のフッ素系樹脂等のプラスチック、あるいは紙を好
適に使用することができる。これらの基材には、多孔質
インク受理層の接着強度を向上させる目的で、コロナ放
電処理やアンダーコート等を行うこともできる。In the present invention, various materials can be used as the base material. For example, polyester such as polyethylene terephthalate, polycarbonate, ETF
A plastic such as a fluorine-based resin such as E, or paper can be preferably used. These substrates may be subjected to corona discharge treatment or undercoating for the purpose of improving the adhesive strength of the porous ink receiving layer.
【0016】[0016]
【作用】本発明における芳香核を有する有機酸の作用
は、明確にはわからないが、多孔質インク受理層に吸着
されて、発色の原因となるプラスチックの可塑剤などの
成分と何らかの相互作用をして、これらの吸着または発
色を抑制するものと思われる。The function of the organic acid having an aromatic nucleus in the present invention is not clearly understood, but it may interact with some components such as plasticizers of plastics that are adsorbed to the porous ink receiving layer and cause color formation. Therefore, it is considered that these adsorption or coloring is suppressed.
【0017】[0017]
実施例 容量2000ccのガラス製反応器に、水540gとイ
ソプロピルアルコール676gを仕込み、マントルヒー
ターにより液温を75℃に加熱した。撹拌しながらアル
ミニウムイソプロポキシド306gを添加し、液温を7
5〜78℃に保持しながら5時間加水分解を行った。そ
の後95℃に昇温し、酢酸9gを添加して48時間、7
5〜78℃に保持して解膠した。さらにこの液を、90
0gになるまで濃縮して、白色のゾルを得た。このゾル
の乾燥物は擬ベーマイトであった。Example A glass reactor having a capacity of 2000 cc was charged with 540 g of water and 676 g of isopropyl alcohol, and the liquid temperature was heated to 75 ° C. by a mantle heater. While stirring, 306 g of aluminum isopropoxide was added, and the liquid temperature was adjusted to 7
Hydrolysis was carried out for 5 hours while maintaining at 5 to 78 ° C. Then, the temperature was raised to 95 ° C., 9 g of acetic acid was added, and the mixture was added for 48 hours to 7
The temperature was kept at 5 to 78 ° C for peptization. Then add 90 parts of this liquid.
Concentration to 0 g gave a white sol. The dried product of this sol was pseudo-boehmite.
【0018】このアルミナゾル5重量部にポリビニール
アルコール1重量部を加えて、さらに水を加えて、固形
分約10%のスラリーを調製した。このスラリーを、コ
ロナ放電処理を施したポリエチレンテレフタレート(厚
さ100μm)からなる基材の上に、バーコーターを用
いて乾燥時の層厚が30μmになるように塗布、乾燥し
ベーマイト質の多孔質層を形成した。To 5 parts by weight of this alumina sol, 1 part by weight of polyvinyl alcohol was added, and further water was added to prepare a slurry having a solid content of about 10%. This slurry was applied onto a base material made of polyethylene terephthalate (thickness 100 μm) that had been subjected to corona discharge treatment, using a bar coater so that the layer thickness when dried was 30 μm, and dried to form a boehmite porous material. Layers were formed.
【0019】上記のようにして得られたシートの塗工面
を、表1に示す濃度のフタル酸のエタノール溶液に浸漬
し、均一に溶液を塗布した。これを垂直に吊して風乾し
た後、ドラム乾燥器にて140℃、4分間加熱焼成し
た。The coated surface of the sheet obtained as described above was dipped in an ethanol solution of phthalic acid having a concentration shown in Table 1 to apply the solution uniformly. This was hung vertically and air-dried, and then heated and baked at 140 ° C. for 4 minutes in a drum dryer.
【0020】このようにして得られた記録用シートの多
孔質中のフタル酸量を、記録用シートの一部を切り出
し、塩酸水溶液に12時間浸漬した後の溶液を水酸化ナ
トリウム溶液で滴定して定量した。また、記録用シート
および比較のためフタル酸処理を行わない記録用シート
の塗工面に同じ大きさのポリ塩化ビニルフィルムを重ね
て、室内で14日間保持し、シート端部におけるに黄色
の着色の有無を目視で確認した。結果を表1に示す。The amount of phthalic acid in the porosity of the recording sheet thus obtained was cut out from a part of the recording sheet and immersed in an aqueous hydrochloric acid solution for 12 hours, and the solution was titrated with a sodium hydroxide solution. Was quantified. In addition, a polyvinyl chloride film of the same size was overlaid on the coated surface of the recording sheet and the recording sheet that was not treated with phthalic acid for comparison, and it was kept indoors for 14 days. The presence or absence was visually confirmed. The results are shown in Table 1.
【0021】表1において、処理液のフタル酸濃度の単
位はM(モル/リットル)、シート中のフタル酸量の単
位は擬ベーマイト(AlOOH)1モル当たりのミリモ
ル数である。表1の端部の黄変の欄において、「有」と
は1枚のシートを観察した場合にも肉眼で明瞭に着色が
観察されたこと、「少」とはシートを3枚重ねたときに
肉眼で着色が観察されたこと、「無」とはシートを3枚
重ねても着色が観察されなかったことを示す。In Table 1, the unit of the concentration of phthalic acid in the treatment liquid is M (mol / liter), and the unit of the amount of phthalic acid in the sheet is the number of millimoles per mol of pseudo-boehmite (AlOOH). In the column of yellowing at the end of Table 1, "yes" means that the coloring was clearly observed with the naked eye even when one sheet was observed, and "minor" means when three sheets were stacked. No coloration was observed with the naked eye, and "no" means that no coloration was observed even after stacking three sheets.
【0022】[0022]
【表1】 [Table 1]
【0023】実施例2 実施例1で得られたシートの塗工面を、表2に示すよう
な有機酸を0.2M含有するエタノール溶液または水溶
液に浸漬し、均一に溶液を塗布した。これを垂直に吊し
て風乾した後、ドラム乾燥器にて140℃、4分間加熱
焼成した。Example 2 The coated surface of the sheet obtained in Example 1 was dipped in an ethanol solution or an aqueous solution containing 0.2 M of an organic acid as shown in Table 2 to apply the solution uniformly. This was hung vertically and air-dried, and then heated and baked at 140 ° C. for 4 minutes in a drum dryer.
【0024】この記録用シートの塗工面に同じ大きさの
ポリ塩化ビニルフィルムを重ねて、室内で14日間保持
し、シート端部における黄色の着色の有無を目視で確認
した。いずれの記録用シートについても、シートを3枚
以上重ねても着色が観察されなかった。A polyvinyl chloride film of the same size was overlaid on the coated surface of this recording sheet and kept in a room for 14 days, and the presence or absence of yellow coloring at the edge of the sheet was visually confirmed. No coloring was observed in any of the recording sheets even when three or more sheets were stacked.
【0025】[0025]
【表2】 [Table 2]
【0026】実施例3 紙の基材上に多孔質シリカを塗布して得られるコート紙
について、実施例1と同様にして濃度0.3Mのフタル
酸のエタノール溶液を塗工面から浸漬し、均一に溶液を
塗布した。これを垂直に吊して風乾したあと、ドラム乾
燥器にて140℃、4分間加熱焼成した。Example 3 A coated paper obtained by coating porous silica on a base material of paper was dipped from the coated surface in an ethanol solution of phthalic acid having a concentration of 0.3M in the same manner as in Example 1 to uniformly coat it. The solution was applied to. This was hung vertically and air-dried, and then heated and baked at 140 ° C. for 4 minutes in a drum dryer.
【0027】このようにして得られた記録用シートおよ
び比較のため処理を行わない記録用シートの塗工面に、
同じ大きさのポリ塩化ビニルフィルムを重ねて、室内で
14日間保持した。無処理シートは端部に黄色の着色が
認められたが、処理シートはそのような着色は認められ
なかった。On the coated surfaces of the recording sheet thus obtained and the recording sheet which was not treated for comparison,
Polyvinyl chloride films of the same size were overlaid and kept indoors for 14 days. The untreated sheet had yellow coloring at the edges, but the treated sheet did not have such coloring.
【0028】[0028]
【発明の効果】本発明の記録用シートは、インクの吸収
性が良好で、かつ、色素の定着性が良好である。しか
も、長期の保存でも変色が生じない。本発明の記録用シ
ートは、種々の記録方式に有効であるが、特にインクジ
ェットプリンター用の記録媒体に適する。The recording sheet of the present invention has good ink absorbability and good dye fixing property. Moreover, discoloration does not occur even after long-term storage. The recording sheet of the present invention is effective for various recording systems, but is particularly suitable for a recording medium for an inkjet printer.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田沼 敏弘 神奈川県横浜市神奈川区羽沢町1150番地 旭硝子株式会社中央研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiro Tanuma 1150 Hazawa-machi, Kanagawa-ku, Yokohama-shi, Kanagawa Asahi Glass Co., Ltd. Central Research Laboratory
Claims (5)
る多孔質インク受理層を有する記録用シート。1. A recording sheet having, on a substrate, a porous ink receiving layer containing an organic acid having an aromatic nucleus.
請求項1の記録用シート。2. The recording sheet according to claim 1, wherein the porous ink receiving layer is pseudo-boehmite.
ある請求項1または請求項2の記録用シート。3. The recording sheet according to claim 1, which is a recording medium for an ink jet printer.
る多孔質インク受理層を有し、この多孔質インク受理層
に色素が担持された記録物。4. A recorded matter having a porous ink-receiving layer containing an organic acid having an aromatic nucleus on a substrate, and a dye being carried on the porous ink-receiving layer.
請求項4の記録物。5. The recorded matter according to claim 4, wherein the porous ink receiving layer is pseudo-boehmite.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP09696693A JP3238522B2 (en) | 1993-03-10 | 1993-03-31 | Recording sheet |
DE69415190T DE69415190T2 (en) | 1993-03-10 | 1994-03-09 | Recording sheet with a dye absorbing layer |
EP94103603A EP0614771B1 (en) | 1993-03-10 | 1994-03-09 | Recording sheet having a colorant-absorbing layer |
US08/208,292 US5445868A (en) | 1993-03-10 | 1994-03-10 | Recording sheet and record |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7620793 | 1993-03-10 | ||
JP5-76207 | 1993-03-10 | ||
JP09696693A JP3238522B2 (en) | 1993-03-10 | 1993-03-31 | Recording sheet |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06316145A true JPH06316145A (en) | 1994-11-15 |
JP3238522B2 JP3238522B2 (en) | 2001-12-17 |
Family
ID=26417361
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP09696693A Expired - Lifetime JP3238522B2 (en) | 1993-03-10 | 1993-03-31 | Recording sheet |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3238522B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6391440B1 (en) | 1999-02-23 | 2002-05-21 | Canon Kabushiki Kaisha | Recording medium and image formation and print employing the medium |
JP2006271771A (en) * | 2005-03-30 | 2006-10-12 | Mizuno Technics Kk | Golf club head and its manufacturing method |
US7736709B2 (en) | 2005-09-22 | 2010-06-15 | Fujifilm Corporation | Recording medium and method for manufacturing recording medium |
-
1993
- 1993-03-31 JP JP09696693A patent/JP3238522B2/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6391440B1 (en) | 1999-02-23 | 2002-05-21 | Canon Kabushiki Kaisha | Recording medium and image formation and print employing the medium |
JP2006271771A (en) * | 2005-03-30 | 2006-10-12 | Mizuno Technics Kk | Golf club head and its manufacturing method |
US7736709B2 (en) | 2005-09-22 | 2010-06-15 | Fujifilm Corporation | Recording medium and method for manufacturing recording medium |
Also Published As
Publication number | Publication date |
---|---|
JP3238522B2 (en) | 2001-12-17 |
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