JPH09267555A - Preparation of undercoating paper for heat-sensitive recording paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make recording sensitivity high and to decrease sticking of tailing on a recording head by using a coating compsn. wherein a calcined kaolin and a fine hollow polymer as pigments and starch and an alkali-swollen latex as adhesives are incorporated. SOLUTION: An undercoating paper for a heat-sensitive recording paper is prepd. by coating a base paper 1 with an undercoating coating compsn. mainly consisting of a pigment and an adhesive. As the undercoating coating compsn., a compsn. wherein a calcined kaolin and a fine hollow polymer as pigments are incorporated so as to make the wt. mixing ratio of the calcined kaolin to the fine hollow polymer to be 9:1-6:4 and a starch and an alkali-swollen latex are incorporated. When the compounding part of the calcined kaolin in the wt. ratio of the calcined caolin to the fine hollow polymer exceeds 9 and becomes smaller than 1, decrease in recording sensitivity and deterioration of sticking properties of tailing are respectively recognized. In addition, among alkali-swollen latexes, those latexes which have their glass transition temp. of at most 0 deg.C exhibit especially good recording sensitivity.

Description

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

【０００１】[0001]

【発明の属する技術分野】本発明は感熱記録紙用アンダ
−コ−ト紙の製造方法に関し、特に記録感度が高く、記
録ヘッドへの粕付着性の少ない感熱記録紙用アンダ−コ
−ト紙をロ−ルコ−タ−で製造する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing undercoat paper for heat-sensitive recording paper, and more particularly to undercoat paper for heat-sensitive recording paper which has high recording sensitivity and less adhesion of lees to a recording head. To a roll coater.

【０００２】[0002]

【従来の技術】感熱記録紙用アンダ−コ−ト紙は表面に
感熱発色塗料を塗布し、感熱記録紙となるが、この時、
アンダ−コ−ト紙の機能としては、記録感度を高くする
こと及び記録ヘッドへの粕付着を少なくすることが主に
求められる。そのためアンダ−コ−ト表面が平滑で、ア
ンダ−コ−ト層に空隙が多いことが通常要求される。そ
こでアンダ−塗被組成物を塗布するコ−タ−ヘッドは、
塗布面の平滑性が優れているブレ−ドコ−タ−やバ−コ
−タ−、ロッドコ−タ−を使用することが一般的であ
る。BACKGROUND OF THE INVENTION Undercoat paper for heat-sensitive recording paper has a surface coated with a heat-sensitive color-developing paint to form a heat-sensitive recording paper.
As the function of the undercoat paper, it is mainly required to increase the recording sensitivity and to reduce the adhesion of lees to the recording head. Therefore, it is usually required that the surface of the undercoat be smooth and that the undercoat layer have many voids. Therefore, the coater head for applying the undercoat composition is
It is common to use a blade coater, a bar coater, or a rod coater, which has an excellent smoothness on the coated surface.

【０００３】これに対してロ−ルコ−タ−は塗被組成物
塗布時、アプリケ−タ−ロ−ルと基紙の間で塗被組成物
層の開裂塗布パタ−ンが発生、塗布面の平滑性が低下、
記録感度が大幅に低下するという大きな欠点がある。従
って、アンダ−塗被組成物の塗布には、これが全く使用
されていないのが現状である。On the other hand, the roll coater, when the coating composition is applied, generates a cleavage coating pattern of the coating composition layer between the applicator roll and the base paper, and the coated surface. The smoothness of
There is a big drawback that the recording sensitivity is significantly lowered. Therefore, at present, it is not used at all for the application of the undercoat composition.

【０００４】しかしロ−ルコ−タ−には前述したような
欠点はあるが、両面を同時に塗布できる(感熱記録紙
は通常片面熱発色塗料塗布であるが、裏面にカ−ル防止
液等を塗布するため、これは大きなメリットになる)、
操作性が簡便で、オンマシン塗工が簡単にできる、
ブレ−ド替えのような周期の短い繁雑な作業がない、
基紙に透き穴、異物が混入していても紙切れの恐れが少
なく、ストリ−クの発生がない、等の数々の利点があ
り、ロ−ルコ−タ−で記録感度が高く、記録ヘッドへの
粕付着の少ない感熱記録紙用アンダ−コ−ト紙を製造で
きれば大きなメリットが生まれるため、この技術に関す
る開発が待ち望まれていた。However, although the roll coater has the above-mentioned drawbacks, it can be coated on both sides at the same time. (Because it is applied, this is a great advantage),
Easy operability, easy on-machine coating,
There is no complicated work with a short cycle such as blade change,
The base paper has many advantages, such as clear paper holes and less risk of paper breakage even if foreign matter is mixed in, and no occurrence of strikes. Since it is possible to produce an undercoat paper for thermal recording paper with less adherence of lees, a great advantage will be produced, and therefore, development of this technology has been long awaited.

【０００５】ロ−ルコ−タ−を前提としない感熱記録紙
用アンダ−コ−ト紙の従来技術としては、これまで多く
の提案がなされており、いくつかの例として特公平３−
５４０８３０号公報、特公平７−１０６２３号公報、特
公平７−６７８５６号公報、特開平１−１１３２８２号
公報、特開平２−３３６９号公報、特開平４−２０１４
８１号公報等があげられる。Many proposals have been made up to now for the prior art of undercoat paper for heat-sensitive recording paper which is not based on a roll coater, and some examples are disclosed in Japanese Patent Publication No.
Japanese Patent Publication No. 540830, Japanese Patent Publication No. 7-10623, Japanese Patent Publication No. 7-67856, Japanese Unexamined Patent Publication No. 1-113282, Japanese Unexamined Patent Publication No. 2-3369, and Japanese Unexamined Patent Publication No. 4-2014.
No. 81 publication is cited.

【０００６】これらを含めてロ−ルコ−タ−を用いる製
造方法の具体的提案が従来見られないが、その理由は、
前述した開裂塗布パタ−ン発生により記録感度が大幅に
低下したり、塗被組成物がアプリケ−タ−ロ−ル上で部
分的に乾き塗布ムラになったり、これがひどくなると基
紙が切れてしまったりして、記録感度が高く、記録ヘッ
ドへの粕付着の少ない感熱記録紙用アンダ−コ−ト紙を
ロ−ルコ−タ−で製造するのは不可能であると、考えら
れていたためと思われる。[0006] Although no concrete proposal of a production method using a roll coater including these is conventionally found, the reason is as follows.
The recording sensitivity is significantly reduced due to the occurrence of the cleavage coating pattern described above, the coating composition is partially dried on the applicator roll and the coating becomes uneven, and when this becomes severe, the base paper is cut off. It was thought that it was impossible to manufacture an undercoat paper for heat-sensitive recording paper having a high recording sensitivity and a small amount of residue adhered to the recording head by a roll coater. I think that the.

【０００７】[0007]

【発明が解決しようとする課題】本発明は記録感度が高
く、記録ヘッドへの粕付着の少ない感熱記録紙用アンダ
−コ−ト紙を、ロ−ルコ−タ−により製造する方法を提
供するものである。SUMMARY OF THE INVENTION The present invention provides a method for producing an undercoat paper for heat-sensitive recording paper, which has a high recording sensitivity and a small amount of residue adhered to a recording head, by a roll coater. It is a thing.

【０００８】[0008]

【課題を解決するための手段】本発明者らは鋭意研究し
た結果、記録感度が高く、記録ヘッドへの粕付着の少な
い感熱記録紙用アンダ−コ−ト紙をロ−ルコ−タ−で製
造するには、基紙上に、顔料として焼成カオリンと微小
中空ポリマ−を、接着剤として澱粉とアルカリ膨潤ラテ
ックスを含ませた塗被組成物をロ−ルコ−タ−で塗布す
れば良いことを見い出し本発明を完成するに至った。As a result of intensive studies by the present inventors, the undercoat paper for heat-sensitive recording paper, which has a high recording sensitivity and a small amount of residue adhered to the recording head, can be used as a roll coater. For production, it is sufficient to coat a base paper with a coating composition containing calcined kaolin and a micro hollow polymer as a pigment and starch and an alkali-swelling latex as an adhesive with a roll coater. The present invention has been completed and the present invention has been completed.

【０００９】ここで顔料として焼成カオリンと微小中空
ポリマ−を配合するが、その理由は次の通りである。一
般に粕付着性が少なくなる顔料は、顔料粒子中に開いた
空隙を多く持っている。この様な顔料は塗被組成物にし
た場合流動性が悪く、ロ−ルコ−タ−で塗布した場合、
ひどい開裂塗布パタ−ンが発生、平滑性が悪化すること
が多い。Here, calcined kaolin and fine hollow polymer are blended as pigments for the following reasons. In general, pigments that have less adhesion to lees have many open voids in the pigment particles. Such a pigment has poor fluidity when formed into a coating composition, and when coated with a roll coater,
A severe cleavage coating pattern often occurs, resulting in poor smoothness.

【００１０】[0010]

【発明の実施の形態】しかし、種々これらの顔料をロ−
ルコ−タ−で塗布して検討した結果、この様な顔料の中
でも、焼成カオリンが塗被組成物にした場合の流動性も
良好で、開裂塗布パタ−ンも少なく、平滑性も良く、粕
付着防止効果にも優れていることが分かった。一方、微
小中空ポリマ−は焼成カオリンに比較して、記録感度向
上効果は優れていたが、これは顔料粒子中に閉じた空隙
しか持っていないため、粕付着性が非常に悪いという欠
点があった。従って、記録感度と粕付着性の両方を満足
するには、両顔料を併用すること良いということが分か
った。DETAILED DESCRIPTION OF THE INVENTION However, various pigments such as
As a result of studying by coating with a lucoter, among these pigments, the fluidity when calcined kaolin was used as a coating composition was good, the cleavage coating pattern was small, the smoothness was good, and the residue was fine. It was found that the anti-adhesion effect was also excellent. On the other hand, the micro hollow polymer was excellent in the effect of improving the recording sensitivity as compared with the calcined kaolin, but this had the drawback that the adhesiveness to the lees was very poor because it had only closed voids in the pigment particles. It was Therefore, it was found that it is preferable to use both pigments in combination in order to satisfy both the recording sensitivity and the adhesion property of lees.

【００１１】本発明は、基紙上に、主として顔料と接着
剤からなるアンダ−コ−ト塗被組成物を、ロ−ルコ−タ
−で塗布して感熱記録紙用アンダ−コ−ト紙を製造する
方法において、顔料として焼成カオリンと微小中空ポリ
マ−を、接着剤として澱粉とアルカリ膨潤ラテックスを
含ませた塗被組成物を用いることを特徴とする感熱記録
紙用アンダ−コ−ト紙の製造方法である。According to the present invention, an undercoat coating composition consisting mainly of a pigment and an adhesive is coated on a base paper with a roll coater to form an undercoat paper for thermal recording paper. A method for producing an undercoat paper for heat-sensitive recording paper, which comprises using a coating composition containing calcined kaolin and a micro hollow polymer as a pigment and starch and an alkali-swelling latex as an adhesive. It is a manufacturing method.

【００１２】本発明は、基紙上に、主として顔料と接着
剤からなるアンダ−コ−ト塗被組成物を、ロ−ルコ−タ
−で塗布して感熱記録紙用アンダ−コ−ト紙を製造する
方法において、顔料として焼成カオリンと微小中空ポリ
マ−を、焼成カオリンと微小中空ポリマ−の重量混合比
が９：１〜６：４となるようにし、接着剤として澱粉と
アルカリ膨潤ラテックスを含ませた塗被組成物を用いる
ことを特徴とする感熱記録紙用アンダ−コ−ト紙の製造
方法である。According to the present invention, an undercoat coating composition consisting mainly of a pigment and an adhesive is applied on a base paper by a roll coater to form an undercoat paper for thermal recording paper. In the manufacturing method, the calcined kaolin and the micro hollow polymer are used as pigments so that the weight mixing ratio of the calcined kaolin and the micro hollow polymer is 9: 1 to 6: 4, and the starch and the alkali swelling latex are contained as the adhesive. A method for producing an undercoat paper for thermal recording paper, which comprises using a coating composition.

【００１３】本発明は、基紙上に、主として顔料と接着
剤からなるアンダ−コ−ト塗被組成物を、ロ−ルコ−タ
−で塗布して感熱記録紙用アンダ−コ−ト紙を製造する
方法において、顔料として焼成カオリンと微小中空ポリ
マ−を、接着剤として澱粉とアルカリ膨潤ラテックスを
含ませた塗被組成物を用い、該アルカリ膨潤ラテックス
のガラス転移温度が０℃以下であることを特徴とする感
熱記録紙用アンダ−コ−ト紙の製造方法である。According to the present invention, an undercoat coating composition comprising a pigment and an adhesive is coated on a base paper with a roll coater to form an undercoat paper for thermal recording paper. In the method for producing, a coating composition containing calcined kaolin and a micro hollow polymer as a pigment and starch and an alkali swelling latex as an adhesive is used, and the glass transition temperature of the alkali swelling latex is 0 ° C. or lower. And a method for producing an undercoat paper for heat-sensitive recording paper.

【００１４】本発明は、基紙上に、主として顔料と接着
剤からなるアンダ−コ−ト塗被組成物を、ロ−ルコ−タ
−で塗布して感熱記録紙用アンダ−コ−ト紙を製造する
方法において、顔料として焼成カオリンと微小中空ポリ
マ−を、焼成カオリンと微小中空ポリマ−の重量混合比
が９：１〜６：４となるようにし、接着剤として澱粉と
アルカリ膨潤ラテックスを含ませた塗被組成物を用い、
該アルカリ膨潤ラテックスのガラス転移温度（以下Ｔｇ
と記す）が０℃以下であることを特徴とする感熱記録紙
用アンダ−コ−ト紙の製造方法である。In the present invention, an undercoat coating composition consisting mainly of a pigment and an adhesive is applied on a base paper by a roll coater to form an undercoat paper for thermal recording paper. In the method for producing, calcined kaolin and fine hollow polymer are used as pigments, the weight mixing ratio of calcined kaolin and fine hollow polymer is 9: 1 to 6: 4, and starch and alkali swelling latex are contained as adhesives. Using the coating composition
Glass transition temperature of the alkali-swelling latex (hereinafter Tg
Is 0 ° C. or lower. The method for producing an undercoat paper for thermal recording paper is characterized by the following.

【００１５】ここで、焼成カオリンと微小中空ポリマ−
の配合比は重量比で１：９〜９：１が特に良好であっ
た。焼成カオリンの配合部数が９を越えると記録感度の
低下が、１未満になると粕付着性の悪化が認められる。Here, calcined kaolin and fine hollow polymer
The mixing ratio of 1: 9 to 9: 1 by weight was particularly good. If the compounding part of the calcined kaolin exceeds 9, the recording sensitivity is lowered, and if it is less than 1, the adhering property of the lees is deteriorated.

【００１６】更に、焼成カオリン、微小中空ポリマ−以
外のその他の顔料も必要に応じて配合しても良い。その
配合比は焼成カオリンと微小中空ポリマ−の合計量とそ
の他の顔料の重量比で１０：０〜７：３が良好である。
焼成カオリンと微小中空ポリマ−の合計量が７未満にな
ると、記録濃度、粕付着性の悪化が認められる。Further, pigments other than calcined kaolin and fine hollow polymer may be blended as required. The mixing ratio is preferably 10: 0 to 7: 3 in terms of the total amount of the calcined kaolin and the micro hollow polymer and the weight ratio of other pigments.
When the total amount of the calcined kaolin and the minute hollow polymer is less than 7, the recording density and the adhesion of the lees are deteriorated.

【００１７】焼成カオリンは塗工用に使えるものであれ
ば何でも良く、例として、アルファテックス、オパシテ
ックス、デルタテックス(イ−・シ−・シ−・インタ−
ナショナル社製)、カオカル(シ−ル社製)、アンシレッ
クス(エンゲルハ−ド社製)等がある。微小中空ポリマ−
もポリマ−の内部に空隙を包含するものであれば使用で
き、例として、ロ−ペイク(ロ−ム＆ハ−ス社製)、ＳＸ
８６３(Ａ)(日本合成ゴム社製)、ＭＨ５０５５(日本ゼ
オン社製)等がある。Any calcined kaolin may be used as long as it can be used for coating, and examples thereof include Alphatex, Opacitex, and Deltatex (E-C-SEE-INTER-F).
National Corporation), Kaokar (Seal), Ansilex (Engelhard), and the like. Micro hollow polymer
Any polymer can be used as long as it contains voids inside the polymer, and examples thereof include ROPAK (made by Rome & Haas Co.) and SX.
863 (A) (manufactured by Japan Synthetic Rubber Co., Ltd.), MH5055 (manufactured by Nippon Zeon Co., Ltd.) and the like.

【００１８】本発明において使用できるその他の顔料に
も特に制限はなく、例えばクレ−、構造化クレ−、炭酸
カルシウム、炭酸マグネシウム、二酸化チタン、水酸化
アルミ、サチンホワイト、合成シリカ、硫酸カルシウ
ム、硫酸バリウム、ケイ藻土、スチレン系プラスチック
ピグメント、尿素系プラスチックピグメント等がある。Other pigments usable in the present invention are not particularly limited, and examples include clay, structured clay, calcium carbonate, magnesium carbonate, titanium dioxide, aluminum hydroxide, satin white, synthetic silica, calcium sulfate and sulfuric acid. Barium, diatomaceous earth, styrene plastic pigments, urea plastic pigments, etc. are available.

【００１９】接着剤として、澱粉を配合するが、澱粉を
配合しないと、開裂塗布パタ−ンが悪化したり、塗被組
成物がアプリケ−タ−ロ−ル上で部分的に乾き塗布ムラ
になったりするため記録感度が低下する。さらに、澱粉
を配合することにより、粕付着防止効果の向上が認めら
れる。配合部数としては顔料１００重量部に対し、５〜
３０重量部、特に５〜２０重量部が良好である。５重量
部未満であると、塗被組成物がアプリケ−タ−上で部分
的に乾き塗布ムラ傾向が見られ、３０重量部を越える
と、塗料の流動性が悪くなることにより塗布パタ−ンが
ひどくなり、平滑性が悪化、５重量部未満と同じく記録
感度の低下が認められる。Starch is blended as an adhesive, but if the starch is not blended, the cleavage coating pattern is deteriorated or the coating composition is partially dried on the applicator roll to cause uneven coating. As a result, the recording sensitivity decreases. Further, by adding starch, the effect of preventing adherence of lees is improved. The compounding number is 5 to 100 parts by weight of the pigment.
30 parts by weight, especially 5 to 20 parts by weight are preferable. When the amount is less than 5 parts by weight, the coating composition is partially dried on the applicator and uneven coating tends to be observed. When the amount is more than 30 parts by weight, the fluidity of the coating composition is deteriorated and the coating pattern is deteriorated. Becomes worse, the smoothness is deteriorated, and the recording sensitivity is decreased as is less than 5 parts by weight.

【００２０】なお澱粉としては各種のものが使用できる
が、例えば澱粉原料でみると、トウモロコシ、馬鈴薯、
小麦、米、タピオカ、甘藷等があり、澱粉変性方法とし
てみると、酸化、尿素リン酸エステル化、酢酸エステル
化、ヒドロキシエチル化、カチオン化、酵素処理、焙焼
化等がある。もちろんこれらを組み合わせても使用でき
る。Various types of starch can be used. For example, when looking at starch raw materials, corn, potatoes,
There are wheat, rice, tapioca, sweet potato, etc., and the starch modification methods include oxidation, urea phosphate esterification, acetate esterification, hydroxyethylation, cationization, enzyme treatment, roasting and the like. Of course, these can be used in combination.

【００２１】又、接着剤としてアルカリ膨潤ラテックス
も配合する。ここでアルカリ膨潤ラテックスとは、アル
カリ性物質を加えるとラテックスの粒子が膨潤して径が
大きくなるもので、これを配合しなかったり非アルカリ
膨潤ラテックスを配合すると、開裂塗布パタ−ンが悪化
したり、塗被組成物がアプリケ−タ−上で部分的に乾き
塗布ムラになったりするため、記録感度の低下に繋がっ
てしまう。An alkali swelling latex is also added as an adhesive. Here, the alkali swelling latex is a particle in which latex particles swell and have a large diameter when an alkaline substance is added, and when this is not blended or when a non-alkali swelling latex is blended, the cleavage coating pattern is deteriorated. However, the coating composition is partially dried on the applicator to cause uneven coating, which leads to a decrease in recording sensitivity.

【００２２】アルカリ膨潤ラテックスの中では、Ｔｇが
０℃以下のものが特に記録感度が良好で好ましい。なお
アルカリ膨潤ラテックスの組成としては何でも良く、例
えば、スチレン−ブタジエン系ラテックス、アクリル系
ラテックス、酢酸ビニル系ラテックス、ウレタン系ラテ
ックス、ニトリル−ブタジエン系ラテックス等がある。
配合部数としては１〜２０重量部、特に１〜１０重量部
が好ましく、１重量部未満では開裂塗布パタ−ンの悪化
やアプリケ−タ−上での部分的な乾き塗布ムラによる記
録感度の低下が見られ、２０重量部を越えると塗被組成
物の流動性が悪くなることにり塗布パタ−ンがひどくな
り、平滑性が悪化、１重量部未満と同じく記録感度の低
下が認められる。Among the alkali-swelling latices, those having Tg of 0 ° C. or less are particularly preferable because they have good recording sensitivity. Any composition may be used as the alkali-swelling latex, and examples thereof include styrene-butadiene latex, acrylic latex, vinyl acetate latex, urethane latex and nitrile-butadiene latex.
The blending number is preferably 1 to 20 parts by weight, particularly preferably 1 to 10 parts by weight, and if it is less than 1 part by weight, the recording sensitivity is deteriorated due to deterioration of the cleavage coating pattern and partial dry coating unevenness on the applicator. When the amount exceeds 20 parts by weight, the fluidity of the coating composition deteriorates, the coating pattern becomes worse, the smoothness deteriorates, and the recording sensitivity decreases similarly to less than 1 part by weight.

【００２３】接着剤として他のものを必要に応じて併用
しても良く、例えばポリビニルアルコ−ル、カゼイン、
大豆蛋白、スチレン−ブタジエン系ラテックス、アクリ
ル系ラテックス、酢酸ビニル系ラテッテクス、ウレタン
系ラテックス、ニトリル−ブタジエン系ラテックス等が
ある。これらの配合部数は澱粉の配合量を越えないのが
良く、これを越えると塗被組成物の流動性とか、粕付着
性の悪化傾向が認められるようになる。If desired, other adhesives may be used in combination, such as polyvinyl alcohol, casein,
Soybean protein, styrene-butadiene latex, acrylic latex, vinyl acetate latextex, urethane latex, nitrile-butadiene latex and the like. It is preferable that the number of parts blended does not exceed the amount of starch blended, and if it exceeds this range, the fluidity of the coating composition and the tendency to adhere to the lees tend to deteriorate.

【００２４】又、この他に分散剤、ＰＨ調整剤、保水
剤、潤滑剤、消泡剤、防腐剤、蛍光染料、染料、着色顔
料、耐水化剤等も必要に応じて使用できる。塗料調製は
例えば、焼成カオリンの分散にはコ−レス分散機を、そ
の他の薬品の混合にはミキサ−を用いて、常法により行
うことができる。In addition to these, a dispersant, a pH adjusting agent, a water retention agent, a lubricant, an antifoaming agent, an antiseptic agent, a fluorescent dye, a dye, a coloring pigment, a water-proofing agent and the like can be used if necessary. The coating composition can be prepared by a conventional method, for example, using a coalescing machine for dispersing calcined kaolin and a mixer for mixing other chemicals.

【００２５】このアンダ−コ−ト用塗被組成物の塗工量
も必要に応じて変わってくるが、好ましくは片面４〜１
５ｇ／ｍ²である。The coating amount of this undercoat coating composition also varies depending on the need, but it is preferably 4-1 on one side.
It is 5 g / m ² .

【００２６】基紙も何でも良く、例えば抄紙パルプで見
ると上質紙、中質紙等があり、基紙のＰＨで見ると中性
紙、酸性紙等がある。これを抄造するパルプも各種のも
のが使用でき、例えば化学パルプ、機械パルプ、古紙パ
ルプ、合成パルプ等がある。必要に応じて、内添サイズ
剤、定着剤、紙力増強剤、濾水歩留まり向上剤、内添填
料、染料、消泡剤、スラテムコントロ−ル剤等を使用し
て良い。The base paper may be of any kind. For example, when viewed from paper making pulp, there are high quality paper and medium quality paper, and when viewed from the PH of the base paper, there are neutral paper and acid paper. Various types of pulp can be used for papermaking, and examples thereof include chemical pulp, mechanical pulp, waste paper pulp, and synthetic pulp. If necessary, an internally added sizing agent, a fixing agent, a paper strengthening agent, a drainage retention improving agent, an internally added filler, a dye, a defoaming agent, a latex control agent and the like may be used.

【００２７】ロ−ルコ−タ−も各種のものが使用できる
が、例としてゲ−トロ−ルコ−タ−、ブレ−ドメ−タリ
ングサイズプレス、ハイドロバ−メ−タリングサイズプ
レス、サイズプレス、リバ−スロ−ルコ−タ−等があ
る。Various roll coaters can be used, but examples thereof include a gate roll coater, a blade metering size press, a hydro bar metering size press, a size press and a river. There are scroll coaters and the like.

【００２８】又、アンダ−コ−ト塗被組成物塗布前及び
塗布後、感熱塗料塗布後のいずれの段階においても、必
要に応じてカレンダ−処理をしても良い。Further, calendering may be carried out at any stage before and after the application of the undercoat coating composition and after the application of the heat-sensitive paint.

【００２９】アンダ−コ−ト紙上に塗布する感熱塗料も
一般に使用されるものが全て使用可能である。支持体上
の感熱発色層の発色成分は、加熱によって記録画像を形
成し得るものであればいかなるものであっても良く、例
えばロイコ染料とフェノール性物質に代表される電子受
容性物質との反応によるもの、イミノ化合物とイソシア
ナート化合物との反応によるもの、長鎖脂肪酸鉄塩と多
価フェノールとの反応によるもの等を利用し得る。これ
らの組み合わせの具体例は、例えば特開昭５４−１１８
８４５号公報などに記載されている。その他の添加物に
ついても公知の素材が使用される。As the heat-sensitive paint to be applied on the undercoat paper, all the commonly used heat-sensitive paints can be used. The color-forming component of the thermosensitive color-forming layer on the support may be any as long as it can form a recorded image by heating, for example, a reaction between a leuco dye and an electron-accepting substance represented by a phenolic substance. , A reaction of an imino compound with an isocyanate compound, a reaction of a long-chain fatty acid iron salt with a polyhydric phenol, and the like can be used. Specific examples of these combinations are described in, for example, JP-A-54-118.
No. 845, etc. Known materials are used for other additives.

【００３０】[0030]

【実施例】以下実施例により更に詳細に説明するが、本
発明はこれにより限定されるものではない。なお、配合
部数は全て有効固形分である。The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. All the compounding parts are effective solids.

【００３１】(実施例−１)アンダ−コ−ト用塗被組成物
調製：顔料としてアルファテックス(焼成カオリン、イ
−・シ−・シ−・インタ−ナショナル社製)１００重量
部、ＳＤＡ−４０Ｐ(分散剤、ソマ−ル工業社製)０.２
重量部、アンモニア０.５重量部を分散水に添加、コ−
レス分散機により３０分間撹拌し、５５％濃度の顔料ス
ラリ−を得た。(Example-1) Preparation of coating composition for undercoat: 100 parts by weight of Alphatex (calcined kaolin, manufactured by I-C-S International) as a pigment, SDA- 40P (dispersant, manufactured by Somer Industry Co., Ltd.) 0.2
Add 0.5 parts by weight of ammonia and 0.5 parts by weight of ammonia to the dispersion water.
The mixture was agitated for 30 minutes with a Les Disperser to obtain a pigment slurry having a concentration of 55%.

【００３２】次いで、この顔料スラリ−６５重量部に対
し、ロ−ペイクＯＰ−８５Ｊ(微小中空ポリマ−、ロ−
ム＆ハ−ス社製)３５重量部、ニ−ルガムＡ−８５(尿素
リン酸エステル化澱粉、アベベ社製)１２重量部、Ｇ−
１５７９(アルカリ膨潤ラテックス、旭化成社製)３重量
部と希釈水を加え２５分間撹拌し、３８％濃度のアンダ
−コ−ト用塗被組成物を得た。Next, with respect to 65 parts by weight of this pigment slurry, Ropaek OP-85J (micro hollow polymer, low polymer) was used.
35 parts by weight, Nylgum A-85 (urea phosphate esterified starch, manufactured by Abbe Co.) 12 parts by weight, G-
3579 parts by weight of 1579 (alkali swollen latex, manufactured by Asahi Kasei Corporation) and dilution water were added and stirred for 25 minutes to obtain a coating composition for undercoat having a concentration of 38%.

【００３３】この塗被組成物を米坪５０ｇ／ｍ²の上質
紙に乾燥塗工量が８ｇ／ｍ²になるように、テストゲ−
トロ−ル(熊谷理機工業社製)を使用して塗布し、温度１
０５℃で１分間乾燥した。次いで、ＪＩＳ Ｐ−８１１
１に準じて前処置し、線圧 １５０ｋｇ／ｃｍ、速度 ５
ｍ／分、チルドロ−ル温度 ４０℃の条件で、塗布面が
チルドロ−ルに当たるようグロスカレンダ−で１回処理
し、感熱記録紙用アンダ−コ−ト紙を得た。This coating composition was applied to a high-quality paper of 50 g / m ² of tsubo so that the dry coating amount was 8 g / m ² , and a test coat was applied.
Troll (manufactured by Kumagai Riki Kogyo Co., Ltd.) and applied at a temperature of 1
It was dried at 05 ° C for 1 minute. Then, JIS P-811
Pretreatment according to 1., linear pressure 150kg / cm, speed 5
Under the conditions of m / min and chill-droll temperature of 40 ° C., the coated surface was treated once with a gloss calender so that the under-coated paper for thermal recording paper was obtained.

【００３４】感熱記録層用塗被組成物の調製 Ａ液調製 ３−ブチルアミノ−６−メチル−７−アニリノフルオラ
ン １０重量部、ポリビニルアルコ−ル(クラレポバ−ル
１０５、クラレ社製)２重量部、水 ２０重量部を加え、
サンドミルで平均粒子径が０.８μｍとなるまで粉砕し
た。 Ｂ液調製 ４−ヒドロキシ−４'−イソプロポキシジフェニルスル
ホン １０重量部、ポリビニルアルコ−ル(クラレポバ−
ル１０５、クラレ社製)２重量部、水 ２０重量部を加
え、サンドミルで平均粒子径１.５μｍとなるまで粉砕
した。 Ｃ液調成 メタタ−フェニル １０重量部、ポリビニルアルコ−ル
(クラレポバ−ル１０５、クラレ社製)２重量部、水 ２
０重量部を加え、サンドミルで平均粒子径が１.０μｍ
となるまで粉砕した。 感熱塗被組成物の作成 Ａ液 １２重量部、Ｂ液 ２４重量部、Ｃ液 １２重量
部、ステアリン酸亜鉛分散体(Ｄ−５２３、中京油脂社
製)３重量部、非晶性シリカ(Ｐ−５２７、水澤化学社
製)１５重量部、ポリビニルアルコ−ル(クラレポバ−ル
１０５、クラレ社製)１重量部、水５０重量部を混合撹
拌し、感熱塗被組成物を得た。Preparation of coating composition for heat-sensitive recording layer Preparation of solution A 3-butylamino-6-methyl-7-anilinofluorane 10 parts by weight, polyvinyl alcohol (Kuraray Poval 105, manufactured by Kuraray Co., Ltd.) 2 Add 20 parts by weight of water and 20 parts by weight of water,
It was pulverized with a sand mill until the average particle size became 0.8 μm. Preparation of solution B 4-hydroxy-4'-isopropoxydiphenyl sulfone 10 parts by weight, polyvinyl alcohol (clarepobar)
(No. 105, manufactured by Kuraray Co., Ltd.) and 20 parts by weight of water were added, and the mixture was pulverized with a sand mill until the average particle diameter became 1.5 μm. Liquid C preparation Metata-phenyl 10 parts by weight, polyvinyl alcohol
(Kuraray Poval 105, manufactured by Kuraray) 2 parts by weight, water 2
Add 0 parts by weight and use a sand mill to obtain an average particle size of 1.0 μm.
And crushed until Preparation of heat-sensitive coating composition 12 parts by weight of solution A, 24 parts by weight of solution B, 12 parts by weight of solution C, 3 parts by weight of zinc stearate dispersion (D-523, Chukyo Yushi Co., Ltd.), amorphous silica (P -527, manufactured by Mizusawa Chemical Co., Ltd.), 15 parts by weight of polyvinyl alcohol (Kuraray Poval 105, manufactured by Kuraray Co., Ltd.) and 50 parts by weight of water were mixed and stirred to obtain a heat-sensitive coating composition.

【００３５】感熱記録層の形成 この塗被組成物を上記感熱記録用アンダ−コ−ト紙に乾
燥塗工量が３ｇ／ｍ²になるようマイヤ−バ−を使用し
て塗布、温度５５℃で１分間乾燥した。次いで、ＪＩＳ
Ｐ−８１１１で前処置し、線圧 １００ｋｇ／ｃｍ、速
度 ５ｍ／分、チルドロ−ル温度４０℃の条件で、塗布
面がチルドロ−ルに当たるようグロスカレンダ−で１回
処理し、感熱記録サンプルを得た。このサンプルについ
て、感熱記録濃度と粕付着性を評価した。結果を表−２
に記す。Formation of Thermosensitive Recording Layer This coating composition was applied to the above thermal recording undercoat paper using a Mayer bar so that the dry coating amount was 3 g / m ² , and the temperature was 55 ° C. And dried for 1 minute. Then JIS
Pretreatment with P-8111, linear pressure of 100 kg / cm, speed of 5 m / min, chill-roll temperature of 40 ° C., treated once with a gloss calender so that the coated surface hits the chill-roll, and heat-sensitive recording sample Obtained. With respect to this sample, the heat-sensitive recording density and the residue adhesion property were evaluated. Table 2 shows the results.
It writes in.

【００３６】(実施例−２〜５)実施例−１において表−
１に従って変更する以外は、実施例−１と同様に行い品
質評価をした。結果を表−２に記す。Examples-2 to 5 Tables in Example-1
The quality was evaluated in the same manner as in Example-1 except that the quality was evaluated according to 1. The results are shown in Table-2.

【００３７】(比較例−１〜５)実施例−１において表−
１に従って変更する以外は、実施例−１と同様に行い品
質評価をした。結果を表−２に記す。Comparative Examples-1 to 5 Tables in Example-1
The quality was evaluated in the same manner as in Example-1 except that the quality was evaluated according to 1. The results are shown in Table-2.

【００３８】[0038]

【表１】 注・Ａ：アルファテックス；焼成カオリン、イー・シー
・シー・インターナショナル社製 Ｂ：ローペイクＯＰ−８５Ｊ；微小中空ポリマー、ロー
ム＆ハース社製 Ｃ：ローペイクＨＰ−９１；微小中空ポリマー、ローム
＆ハース社製 Ｄ：ウルトラホワイト９０；クレー、エンゲルハード社
製 Ｅ：ニールガムＡ−８５；尿素リン酸エステル化澱粉、
アベベ社製 Ｆ：ペンホードガム２９５；ヒドロキシエチルエーテル
化澱粉、ペンフォードプロダクツ社製 Ｇ：Ｇ−１５７９．０１；アルカリ膨潤スチレンーブタ
ジエン系共重合体（Ｔｇ＝−４０℃）、旭化成社製 Ｈ：ＳＮ−３０７；アルカリ非膨潤スチレンーブタジエ
ン系共重合体、住友ダウ社製 顔料配合、澱粉、ラテックスの数字は重量部。塗工量は
ｇ／ｍ²。[Table 1] Note: A: Alphatex; calcined kaolin, made by ECS International B: Lowpaque OP-85J; Micro hollow polymer, manufactured by Rohm & Haas C: Lowpaque HP-91; Micro hollow polymer, Rohm & Haas Product D: Ultra White 90; Clay, manufactured by Engelhard E: Neil gum A-85; Urea phosphate esterified starch,
Abebe F: Penhodogum 295; Hydroxyethyl etherified starch, Penford Products G: G-1579.01; Alkali swollen styrene-butadiene copolymer (Tg = -40 ° C), Asahi Kasei H: SN -307; Alkali non-swollen styrene-butadiene copolymer, Sumitomo Dow Pigment blend, starch, latex figures are parts by weight. The coating amount is g / m ² .

【００３９】[0039]

【表２】 [Table 2]

【００４０】試験法 （記録感度)感熱発色試験装置(大倉電気社製)で測定。
マクベス光学濃度計で発色濃度を測定して、１.０の測
定値になったときのサンプルと記録ヘッドとの接触時間
(ｍｓｅｃ.)を感度とする。従って、この数値が小さい
ほど、記録感度は高い。 (粕付着)長さ２０ｃｍのサンプルを１０枚、ＶＰ−３５
(セイコ−社製)でテストパタ−ンを連続印字する。この
印字面上の筋の発生度合いを目視評価する。記録ヘッド
に粕が付着すると、印字面に筋が発生する。 ５：１０枚印字しても筋の発生のないもの。 ４：９〜１０枚目の印字で筋の発生が認められるもの。 ３：５〜６枚目の印字で筋の発生が認められるもの。 ２：２〜３枚目の印字で筋の発生が認められるもの。 １：１枚目の印字で筋の発生が認められるもの。Test Method (Recording Sensitivity) Measured with a thermosensitive color tester (manufactured by Okura Electric Co., Ltd.).
Contact time between the sample and the print head when the color density was measured with a Macbeth optical densitometer and the measured value was 1.0.
(msec.) is the sensitivity. Therefore, the smaller this value, the higher the recording sensitivity. (Adhesion of lees) Ten samples with a length of 20 cm, VP-35
(Seiko Co., Ltd.) continuously prints the test pattern. The degree of occurrence of streaks on the printed surface is visually evaluated. When the residue adheres to the recording head, streaks occur on the printed surface. 5: No streaking even after printing 10 sheets. 4: Streaks are observed on the 9th to 10th sheets of printing. 3: Streaks are observed on the 5th to 6th sheets. 2: Streaks are observed on the 2nd to 3rd prints. 1st: Streaks are observed on the first printed sheet.

【００４１】[0041]

【発明の効果】比較例１は微小中空ポリマ−が、比較例
２は焼成カオリンが、比較例３及び５はアルカリ膨潤ラ
テックスが、比較例４は澱粉が含まれておらず請求の範
囲外である。実施例とこれら比較例から分かるように、
基紙上に、顔料として焼成カオリンと微小中空ポリマ−
を、接着剤として澱粉とアルカリ膨潤ラテックスを含む
塗被組成物をロ−ルコ−タ−で塗工することにより、記
録感度が高く、記録ヘッドへの粕付着の少ない感熱記録
紙用アンダ−コ−ト紙の製造が可能になった。INDUSTRIAL APPLICABILITY Comparative Example 1 does not contain a fine hollow polymer, Comparative Example 2 does not contain calcined kaolin, Comparative Examples 3 and 5 do not contain an alkali swelling latex, and Comparative Example 4 does not contain starch. is there. As can be seen from the examples and these comparative examples,
On the base paper, fired kaolin as pigment and fine hollow polymer
By coating a coating composition containing starch and an alkali-swelling latex as an adhesive with a roll coater to obtain high recording sensitivity and less undercoat for heat-sensitive recording paper with less residue adhered to the recording head. -It became possible to manufacture paper.

フロントページの続き (51)Int.Cl.⁶ 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ４１Ｍ 5/18 １１１ Ｄ２１Ｈ 1/22 Ｂ Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location B41M 5/18 111 D21H 1/22 B

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】基紙上に、主として顔料と接着剤からなる
アンダ−コ−ト塗被組成物を、ロ−ルコ−タ−で塗布し
て感熱記録紙用アンダ−コ−ト紙を製造する方法におい
て、顔料として焼成カオリンと微小中空ポリマ−を、接
着剤として澱粉とアルカリ膨潤ラテックスを含ませた塗
被組成物を用いることを特徴とする感熱記録紙用アンダ
−コ−ト紙の製造方法。1. An undercoat paper for heat-sensitive recording paper is manufactured by applying an undercoat coating composition mainly composed of a pigment and an adhesive onto a base paper by means of a roll coater. In the method, a coating composition containing calcined kaolin and a micro hollow polymer as a pigment and starch and an alkali swelling latex as an adhesive is used to produce an undercoat paper for thermal recording paper. . 【請求項２】該塗被組成物中の焼成カオリンと微小中空
ポリマ−の重量混合比が９：１〜６：４であることを特
徴とする請求項１記載の感熱記録紙用アンダ−コ−ト紙
の製造方法。2. The undercoat for thermal recording paper according to claim 1, wherein the weight mixing ratio of the calcined kaolin and the micro hollow polymer in the coating composition is 9: 1 to 6: 4. -A method for producing paper. 【請求項３】該塗被組成物中のアルカリ膨潤ラテックス
として、ガラス転移温度が０℃以下であることを特徴と
する請求項１または２記載の感熱記録紙用アンダ−コ−
ト紙の製造方法。3. The undercoat for thermal recording paper according to claim 1, wherein the alkali swelling latex in the coating composition has a glass transition temperature of 0 ° C. or lower.
Paper manufacturing method.