JP3055628B2 - Alumina sol coating liquid - Google Patents
Alumina sol coating liquidInfo
- Publication number
- JP3055628B2 JP3055628B2 JP2180511A JP18051190A JP3055628B2 JP 3055628 B2 JP3055628 B2 JP 3055628B2 JP 2180511 A JP2180511 A JP 2180511A JP 18051190 A JP18051190 A JP 18051190A JP 3055628 B2 JP3055628 B2 JP 3055628B2
- Authority
- JP
- Japan
- Prior art keywords
- alumina sol
- coating liquid
- coating
- solid content
- sol
- 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.)
- Expired - Lifetime
Links
Landscapes
- Ink Jet Recording Methods And Recording Media Thereof (AREA)
Description
【発明の詳細な説明】 [産業上の利用分野] 本発明は、アルミナゾル塗工液、特に記録用シートを
製造するための塗工液に関するものである。Description: TECHNICAL FIELD The present invention relates to an alumina sol coating liquid, particularly to a coating liquid for producing a recording sheet.
[従来の技術] 近年、各種学会、会議等のプレゼンテーション用とし
て、従来のスライドプロジェクターに替わり、オーバー
ヘッドプロジェクターが用いられる機会が多くなってい
る。また、印刷の分野でも、各種の出版物や、包装等の
用途で、透明な印刷物が求められるようになっている。[Related Art] In recent years, overhead projectors have been increasingly used in place of conventional slide projectors for presentations at various academic meetings and conferences. Also, in the field of printing, transparent printed matter has been required for various publications and applications such as packaging.
これらの透明なシートへの印字、印刷は、基材である
シートそれ自体に吸収性が無いため、一般の紙面上に行
なう印刷に比べ印刷の速度や乾燥の面で特別な配慮が必
要である。不透明な基材においても、吸収性に乏しく同
様な配慮が必要な場合が多い。Printing and printing on these transparent sheets requires special consideration in terms of printing speed and drying compared to printing on ordinary paper because the base sheet itself has no absorbency. . Even opaque substrates often have poor absorbency and require similar considerations.
本発明者らは、基材上にアルミナ水和物からなる吸着
層を設けた記録シートが、上記の問題点を解決できるこ
とを見出して、既に特願平1−121414号などとして提案
した。The present inventors have found that a recording sheet in which an adsorption layer made of alumina hydrate is provided on a substrate can solve the above problems, and have already proposed it as Japanese Patent Application No. 1-121414.
[発明が解決しようとする問題点] 従来この記録シートは、アルミナゾルにポリビニルア
ルコール等の水溶性高分子をバインダーとして加えて、
これを塗工液としてポリエチレンテレフタレートのよう
なプラスチックシートに塗って製造されていた。[Problems to be Solved by the Invention] Conventionally, this recording sheet is obtained by adding a water-soluble polymer such as polyvinyl alcohol as a binder to alumina sol,
This was applied to a plastic sheet such as polyethylene terephthalate as a coating liquid to produce the composition.
しかしながら、アルミナゾルにポリビニルアルコール
を加えた場合、塗工液の粘度が経時的に増加して次第に
塗布操作が困難になるという問題点があり、塗布工程の
直前に塗工液を調製し短時間の間に塗布工程を完了させ
なければならなかった。However, when polyvinyl alcohol is added to the alumina sol, there is a problem that the viscosity of the coating solution increases with time and the coating operation becomes gradually difficult. The coating process had to be completed in between.
本発明の目的は、経時的に安定なアルミナゾル塗工液
を提供することにある。An object of the present invention is to provide an alumina sol coating solution that is stable over time.
[課題を解決するための手段] 本発明は、アルミナゾルに、アルミナゾルの固形分に
対し5〜50重量%のモノカルボン酸と、アルミナゾルの
固形分に対し5〜50重量%の水溶性高分子バインダーを
混合したことを特徴とするアルミナゾル塗工液を提供す
るものである。[Means for Solving the Problems] The present invention relates to an alumina sol, a monocarboxylic acid of 5 to 50% by weight based on the solid content of alumina sol, and a water-soluble polymer binder of 5 to 50% by weight based on the solid content of alumina sol. And an alumina sol coating liquid characterized by mixing the above.
本発明では、アルミナゾルに水溶性高分子バインダー
を混合する際にアルミナゾルの固形分に対して5〜50重
量%のモノカルボン酸を添加するので、アルミナゾルの
粘度の経時的な上昇が抑えられる。その理由は明らかで
はないが、添加したモノカルボン酸がpHの緩衝剤として
働き、ゾルが安定化されるのではないかと考えられる。In the present invention, when the water-soluble polymer binder is mixed with the alumina sol, the monocarboxylic acid is added in an amount of 5 to 50% by weight based on the solid content of the alumina sol, so that the viscosity of the alumina sol can be prevented from increasing with time. Although the reason is not clear, it is considered that the added monocarboxylic acid acts as a pH buffer and stabilizes the sol.
モノカルボン酸の添加量は、アルミナゾルの固形分に
対して、5〜50重量%であることが必要である。添加量
が5重量%に満たない場合は、本発明の効果が十分発現
せず、経時的に塗工液の粘度が上昇することがあり不適
当である。添加量が50重量%を超える場合は、モノカル
ボン酸の添加の効果がそれ以上増大せず、逆に激しい臭
いがしたり乾燥が遅くなるなど塗工および乾燥作業上の
問題があるので好ましくない。モノカルボン酸の添加量
が、アルミナゾル固形分に対して10〜35重量%である場
合は、塗工液がさらに安定で、かつ作業上の問題も少な
いので、さらに好ましい。It is necessary that the amount of the monocarboxylic acid to be added is 5 to 50% by weight based on the solid content of the alumina sol. When the addition amount is less than 5% by weight, the effect of the present invention is not sufficiently exhibited, and the viscosity of the coating liquid may increase with time, which is inappropriate. If the addition amount exceeds 50% by weight, the effect of the addition of the monocarboxylic acid is not further increased, and on the contrary, there are problems in coating and drying work such as intense smell and slow drying, which is not preferable. . It is more preferable that the amount of the monocarboxylic acid added is 10 to 35% by weight based on the solid content of the alumina sol, because the coating solution is more stable and there are few problems in operation.
モノカルボン酸としては、塗工液の安定化の効果が高
くかつ取り扱いが容易であるので酢酸が最も好ましい。As the monocarboxylic acid, acetic acid is most preferable because the effect of stabilizing the coating liquid is high and the handling is easy.
本発明の塗工液を製造するには、アルミナゾルにま
ず、アルミナゾルの固形分に対して5〜50重量%のモノ
カルボン酸を添加した後、水溶性高分子バインダーを加
えるのが好ましい。このようにして得た、塗工液は経時
的に安定で、塗布可能な状態で長時間保存することがで
きる。In order to produce the coating liquid of the present invention, it is preferable to first add a monocarboxylic acid of 5 to 50% by weight based on the solid content of the alumina sol, and then add a water-soluble polymer binder to the alumina sol. The coating liquid thus obtained is stable over time and can be stored for a long time in a coatable state.
本発明の塗工液においては、固形分濃度が5〜15重量
%であることが好ましい。固形分濃度が5重量%未満で
ある場合は、乾燥工程に時間やエネルギーを多く必要と
し、あるいは、粘度が低すぎて塗布方法が制限される恐
れがあるので好ましくない。固形分濃度が15重量%をこ
える場合は、塗工液の粘度が高くなって塗工操作が困難
になり、またモノカルボン酸の添加にもかからず、塗工
液の粘度が上昇する恐れがあるので好ましくない。さら
に好ましい固形分濃度は8〜12重量%である。In the coating liquid of the present invention, the solid content concentration is preferably 5 to 15% by weight. When the solid content is less than 5% by weight, it is not preferable because much time and energy are required for the drying step, or the viscosity may be too low to restrict the coating method. If the solids concentration exceeds 15% by weight, the viscosity of the coating liquid will increase, making the coating operation difficult, and the viscosity of the coating liquid may increase without adding the monocarboxylic acid. Is not preferred. A more preferred solid content concentration is 8 to 12% by weight.
本発明の塗工液においても、アルミナゾルの固形分濃
度が高いものを長時間保存した場合は、塗工液がゲル化
することがある。しかし、この場合もゲル化した塗工液
を撹拌すると、再び均一で低粘度の塗工液にすることが
できる。Also in the case of the coating liquid of the present invention, when the one having a high solid content of alumina sol is stored for a long time, the coating liquid may gel. However, also in this case, when the gelled coating liquid is stirred, it can be made into a uniform and low-viscosity coating liquid again.
水溶性高分子バインダーの使用量は、少ないと塗膜の
強度が不十分になり、逆に多すぎると吸収性および定着
性が阻害され適当ではなく、アルミナゾル固形分の5〜
50重量%であることが必要である。本発明において、水
溶性高分子バインダーとしてはポリビニルアルコールが
好適に用いられる。When the amount of the water-soluble polymer binder used is small, the strength of the coating film becomes insufficient. On the other hand, when the amount is too large, the absorbability and fixability are impaired, which is not appropriate.
It must be 50% by weight. In the present invention, polyvinyl alcohol is preferably used as the water-soluble polymer binder.
アルミナゾルとしては、基材に塗布乾燥した後で、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、かつインク受容層の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、塗布後の材料も透明なも
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。As an alumina sol, after coating and drying on a substrate, if the pore structure is substantially composed of pores with a radius of 10 to 100 mm and the pore volume is 0.3 to 1.0 cc / g, sufficient absorption And the transparency of the ink receiving layer is also preferable. At this time, if the substrate is transparent, a transparent material can be obtained after application. When the substrate is opaque, required physical properties can be imparted without impairing the texture of the substrate.
望ましくは、これらの物性に加え、アルミナゾル乾燥
時の平均細孔半径が15〜50Åであり、その平均細孔半径
の±10Åの半径を有する細孔の容積が全細孔容積の45%
以上である場合は、記録用シートにしたときの定着性と
透明性の両立の観点から好ましい。平均細孔半径が15〜
30Åであり、その平均細孔半径の±10Åの半径を有する
細孔の容積が全細孔容積の55%以上である場合は、さら
に好ましい。なお、ここでの細孔径分布の測定は、窒素
吸脱着法による。Desirably, in addition to these physical properties, the average pore radius when the alumina sol is dried is 15 to 50 °, and the volume of pores having a radius of ± 10 ° of the average pore radius is 45% of the total pore volume.
The above case is preferable from the viewpoint of compatibility between fixability and transparency when formed into a recording sheet. Average pore radius is 15 ~
It is more preferable that the volume of pores having a radius of ± 10 ° of the average pore radius is 30% or more and 55% or more of the total pore volume. The measurement of the pore size distribution here is based on the nitrogen adsorption / desorption method.
アルミナゾルとしては、記録用シートとしたとき良好
なインクの吸収性、吸着性が得られることなどから、ベ
ーマイト(A10(OH))ゾルが好ましい。As the alumina sol, a boehmite (A10 (OH)) sol is preferable because good ink absorptivity and adsorbability can be obtained when a recording sheet is used.
本発明の塗工液は、基材上に、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塗布し、乾燥することにより
記録用シートに適した吸着層を得ることができる。基材
としては種々のものを使用することができる。本発明で
は、ポリエチレンテレフタレート、ポリエステル、ポリ
カーボネート、ETFE等のフッ素系樹脂等のプラスチック
等を使用することができる。また、塗膜の接着強度を向
上させる目的で、コロナ放電処理やアンダーコート等を
行なうこともできる。The coating liquid of the present invention, on a substrate, a roll coater, an air knife coater, a blade coater, a rod coater,
By applying and drying using a bar coater or the like, an adsorption layer suitable for a recording sheet can be obtained. Various substrates can be used. In the present invention, plastics such as polyethylene terephthalate, polyester, polycarbonate, fluorine-based resin such as ETFE, and the like can be used. Further, for the purpose of improving the adhesive strength of the coating film, a corona discharge treatment, an undercoat or the like can be performed.
塗膜の厚さは、各プリンター等の仕様によって適宜選
択されるが、一般には0.5〜20μmを採用するのが好ま
しい。塗膜の厚さが0.5μmに満たない場合は効果が発
現し難く、20μmを超える場合は、透明性が損なれわた
り塗膜の強度が低下する恐れがあるので好ましくない。The thickness of the coating film is appropriately selected depending on the specifications of each printer and the like, but it is generally preferable to adopt 0.5 to 20 μm. When the thickness of the coating is less than 0.5 μm, the effect is hardly exhibited, and when it exceeds 20 μm, the transparency may be impaired or the strength of the coating may be undesirably reduced.
[実施例] 容量2のセパラブルフラスコ(撹拌羽根・温度計
付)に、イオン交換水810gとイソプロピルアルコール67
6gを仕込み、マントルヒーターにより液温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を306.
4g添加し、液温を75〜78℃に保持して5時間加水分解を
行なった。次に、95℃に昇温し、酢酸9gを添加して48時
間95〜97℃に保持して解膠した。その後、液量が900gに
なるまで濃縮して、白色のゾルを得た。このゾルを140
℃で乾燥したときの固形物の重量を測定したところ、こ
のゾルの固形分は10.0%であった。また、このゾルを乾
燥して得られる固形物は、粉末X線回折によると擬ベー
マイトであった。[Example] In a separable flask having a capacity of 2 (with a stirring blade and a thermometer), 810 g of ion-exchanged water and isopropyl alcohol 67 were added.
6 g was charged and heated to a liquid temperature of 75 ° C. by a mantle heater. While stirring, add aluminum isopropoxide to 306.
4 g was added, and hydrolysis was carried out for 5 hours while maintaining the liquid temperature at 75 to 78 ° C. Next, the temperature was raised to 95 ° C., 9 g of acetic acid was added, and the mixture was kept at 95 to 97 ° C. for 48 hours to peptize. Thereafter, the solution was concentrated until the liquid amount reached 900 g, to obtain a white sol. 140 of this sol
The weight of the solid after drying at ℃ was measured, and the solid content of this sol was 10.0%. The solid obtained by drying this sol was pseudo boehmite according to powder X-ray diffraction.
このゾル150gに、酢酸1.5gを添加した後、ポリビニル
アルコール(クラレ社製;PVA117)10重量%水溶液22.5g
を添加混合して塗工液を得た。同様にして、酢酸の添加
量3gおよび4.5gの塗工液を調製した。After adding 1.5 g of acetic acid to 150 g of this sol, 22.5 g of a 10% by weight aqueous solution of polyvinyl alcohol (manufactured by Kuraray; PVA117)
Was added and mixed to obtain a coating liquid. In the same manner, a coating solution containing 3 g and 4.5 g of acetic acid was prepared.
これらの塗工液について、調製後の経過時間と粘度と
の関係を図1に示す。粘度の測定は、B型粘度計(東京
計器社製)を用いた。FIG. 1 shows the relationship between the elapsed time after preparation and the viscosity of these coating solutions. The viscosity was measured using a B-type viscometer (manufactured by Tokyo Keiki Co., Ltd.).
これらの塗工液を脱泡した後、ポリエチレンテレフタ
レートフィルム(帝人社製;OCタイプ、厚さ100μm)上
にバーコーターを用いて乾燥後の厚さが5μmになるよ
うに塗布し、乾燥した。この塗布操作を塗工液調製直後
と、調製から7時間経過後行なったところ、酢酸添加量
の異なる3種の塗工液の全てについて、いずれも良好な
塗膜が得られた。After defoaming these coating liquids, they were applied on a polyethylene terephthalate film (manufactured by Teijin Limited; OC type, thickness: 100 μm) using a bar coater so that the thickness after drying was 5 μm, and dried. When this coating operation was performed immediately after preparation of the coating liquid and after 7 hours from the preparation, good coating films were obtained for all three coating liquids with different amounts of acetic acid added.
[比較例] 実施例で用いたアルミナゾルについて、酢酸を添加し
ないこと以外は全て実施例と同様にして塗工液を調製し
た。実施例と同様にして測定した粘度の経時変化を図1
に示す。また、実施例と同様に、塗工液調製直後と、調
製から7時間経過後に塗布操作を行なった。調製直後
は、良好な塗膜が得られたが、7時間経過後は、ムラの
ある塗膜しか得られなかった。Comparative Example With respect to the alumina sol used in the example, a coating solution was prepared in the same manner as in the example except that acetic acid was not added. FIG. 1 shows the change over time of the viscosity measured in the same manner as in the example.
Shown in Further, in the same manner as in the examples, the coating operation was performed immediately after the preparation of the coating liquid and after 7 hours from the preparation. Immediately after the preparation, a good coating film was obtained, but after 7 hours, only a coating film having unevenness was obtained.
[発明の効果] 本発明の塗工液は、経時的な粘度の変化が少なく塗工
操作が容易である。[Effects of the Invention] The coating liquid of the present invention has a small change in viscosity with time, and the coating operation is easy.
図1は、実施例および比較例の塗工液の粘度の経時変化
を示す図である。FIG. 1 is a diagram showing the time-dependent changes in the viscosity of the coating liquids of Examples and Comparative Examples.
Claims (2)
対し5〜50重量%のモノカルボン酸と、アルミナゾルの
固形分に対し5〜50重量%の水溶性高分子バインダーを
混合したことを特徴とするアルミナゾル塗工液。An alumina sol is characterized in that a monocarboxylic acid of 5 to 50% by weight based on the solid content of the alumina sol and a water-soluble polymer binder of 5 to 50% by weight based on the solid content of the alumina sol are mixed. Alumina sol coating liquid.
の塗工液。2. The coating liquid according to claim 1, wherein the monocarboxylic acid is acetic acid.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2180511A JP3055628B2 (en) | 1990-07-10 | 1990-07-10 | Alumina sol coating liquid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2180511A JP3055628B2 (en) | 1990-07-10 | 1990-07-10 | Alumina sol coating liquid |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0467985A JPH0467985A (en) | 1992-03-03 |
JP3055628B2 true JP3055628B2 (en) | 2000-06-26 |
Family
ID=16084531
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2180511A Expired - Lifetime JP3055628B2 (en) | 1990-07-10 | 1990-07-10 | Alumina sol coating liquid |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3055628B2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2122099C (en) | 1993-04-28 | 1999-08-17 | Hitoshi Yoshino | Recording medium, ink-jet recording method using the same, and dispersion of alumina hydrate |
DE69406731T2 (en) * | 1993-07-30 | 1998-03-26 | Canon Kk | The recording element, the ink jet recording method using the same, printing and dispersion thus obtained, and the method for producing the recording element using the dispersion |
JP3308382B2 (en) * | 1994-04-04 | 2002-07-29 | 旭硝子株式会社 | Method of manufacturing recording sheet for inkjet printer |
JPH09150570A (en) * | 1994-10-31 | 1997-06-10 | Canon Inc | Medium to be recorded, dispersion therefor, production thereof and image forming method using medium |
JPH08295509A (en) * | 1995-04-24 | 1996-11-12 | Asahi Glass Co Ltd | Low viscosity and high concentration alumina sol |
US8070466B2 (en) | 2006-10-11 | 2011-12-06 | Freund Corporation | Seamless capsule manufacturing apparatus |
-
1990
- 1990-07-10 JP JP2180511A patent/JP3055628B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0467985A (en) | 1992-03-03 |
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