JPH1072796A - Double-side coated paper for printing - Google Patents

Double-side coated paper for printing

Info

Publication number
JPH1072796A
JPH1072796A JP16724897A JP16724897A JPH1072796A JP H1072796 A JPH1072796 A JP H1072796A JP 16724897 A JP16724897 A JP 16724897A JP 16724897 A JP16724897 A JP 16724897A JP H1072796 A JPH1072796 A JP H1072796A
Authority
JP
Japan
Prior art keywords
coated paper
double
printing
paper
latex
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
JP16724897A
Other languages
Japanese (ja)
Inventor
Shunichi Uchimura
俊一 内村
Hideyuki Suzuki
英之 鈴木
Terunobu Fukui
照信 福井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
New Oji Paper Co Ltd
Original Assignee
Oji Paper Co Ltd
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 Oji Paper Co Ltd filed Critical Oji Paper Co Ltd
Priority to JP16724897A priority Critical patent/JPH1072796A/en
Publication of JPH1072796A publication Critical patent/JPH1072796A/en
Pending legal-status Critical Current

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  • Paper (AREA)

Abstract

PROBLEM TO BE SOLVED: To prepare a sheet of double-side coated paper, having a high gloss and a high stiffness (paper stiffness) and excellent in smoothness and printability. SOLUTION: This sheet of double-side coated paper for printing has an average value L of Clark protruding lengths in the long and short grains measured according to the method A of JIS P8143 satisfies the following formula L>1.28X +45[L is the average value (unit: mm) of the Clark protruding lengths in the long and short grains of the coated paper; X is the metric basis weight (g/m<2> ) of the product] in the double-side coated paper for printing finished by threading thereof through a high-temperature calender at >=100 deg.C. The sheet of double- sided coated paper is prepared by including kaolin assuming a specific particle size distribution as a pigment in an amount of 40-90wt.% based on the total pigment and a copolymer latex (a) having 25-50 deg.C glass transition temperature as an adhesive in an amount of 5-30wt.% expressed in terms of the ratio of solid contents based on the total pigment in coating layers on the outermost sides of both surfaces of the coated paper and the dry weight of the coating layers based on one surface is 12-30g/m<2> .

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】本発明は印刷用塗被紙に関
し、特に光沢が高く、平滑性に優れ、かつ剛度（紙腰）
の高い印刷用両面塗被紙に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated paper for printing, which has particularly high gloss, excellent smoothness, and rigidity (paper stiffness).
High-quality double-sided coated paper for printing.

【０００２】[0002]

【従来の技術】一般的に、印刷用塗被紙には高光沢と高
平滑性、および優れた印刷適性が要求される。特に、近
年、印刷技術の向上と相まって高速印刷のニーズが高ま
るのに伴って、印刷作業性や印刷適性の観点から、前記
のような品質特性を備えた上で、かつ高い剛度（所謂、
強い紙腰）を具備した印刷用塗被紙が求められている。
剛度が高いと高速印刷機にかけた場合でも紙送りが円滑
に行われ、さらに剛度が高いほど製品として嵩高な風合
いを呈する。具体的には、剛度の高い紙を本文用紙に用
いて雑誌やカタログ等に製本すると、本の背中を指で挟
んで持ち上げると、恰もハードカバーの本を持ち上げた
ような硬い感触や、実際の本の厚さ以上に厚い重量感が
得られ、結果的に本やカタログに重量感や高級感が醸成
されて、印刷用紙としての商品価値が高まるものであ
る。2. Description of the Related Art Generally, coated paper for printing is required to have high gloss and high smoothness and excellent printability. In particular, in recent years, along with the need for high-speed printing coupled with the improvement of printing technology, from the viewpoint of printing workability and printability, in addition to the quality characteristics as described above, high rigidity (so-called,
A coated paper for printing having a strong paper stiffness is required.
If the rigidity is high, the paper is smoothly fed even when it is applied to a high-speed printing machine, and the higher the rigidity, the more bulky the texture of the product. Specifically, if you use high-stiffness paper as the text paper and bind it to magazines or catalogs, and lift it by pinching the back of the book with your fingers, you will feel a hard feeling like lifting a hard cover book, A thicker feeling than the thickness of a book is obtained, and as a result, a heavy feeling and a high-grade feeling are created in books and catalogs, and the commercial value as printing paper is increased.

【０００３】また、剛度は、紙の米坪や密度と密接な関
係にあり、一般的にいって、米坪が高くなるほど剛度が
増し、一方、紙の密度が高くなるほど剛度が低下する傾
向にある。したがって、塗被紙の米坪を増し、このもの
を本文用紙として使用すると、上記したように、本やカ
タログに重量感や高級感を付与できるが、他方紙の重量
が必要以上に重くなるといった問題がある。そのため
に、米坪が軽くても剛度の高い製品（塗被紙）が要望さ
れている。しかしながら、印刷用塗被紙にあっては、剛
度以外に高い光沢と平滑性を有することが要求され、か
かる性質を付与するには、ある程度、紙の密度を高めな
ければならなくなる。つまり、光沢や平滑性を高めるた
めには、キャレンダー掛けを不可欠とし、キャレンダー
処理を行えば、必然的に密度が高まり、剛度は低下す
る。このように光沢や平滑性は、剛度との関係でいえば
相反する関係にある。Further, the rigidity is closely related to the rice slab and density of the paper. Generally speaking, the higher the rice slab is, the higher the rigidity is. On the other hand, the higher the paper density is, the lower the rigidity is. is there. Therefore, if the weight of the coated paper is increased and this material is used as the text paper, as described above, the book and the catalog can be given a feeling of weight and luxury, but the weight of the other paper becomes unnecessarily heavy. There is. Therefore, there is a demand for a product (coated paper) that has a high rigidity even though it has a light weight. However, the coated paper for printing is required to have high gloss and smoothness in addition to rigidity, and it is necessary to increase the density of the paper to some extent in order to impart such properties. That is, in order to enhance gloss and smoothness, calendaring is indispensable, and if calendering is performed, the density inevitably increases and the rigidity decreases. As described above, the gloss and the smoothness have a contradictory relationship with respect to the rigidity.

【０００４】従来から、印刷用塗被紙の剛度改良技術に
ついては種々の提案がなされている。例えば、原紙にお
いては針葉樹パルプ（ＮＫＰ）の高率配合、塗被組成物
については澱粉の高率配合、さらには、特開平６−２８
７５０３号に開示されているように、ガラス転移温度
（以下、Ｔｇと称す）の高い共重合体ラテックスを高率
配合することなどによって、その目的を達成しようとし
ているのが現状である。しかしながら、原紙にＮＫＰを
高率配合したり、塗被組成物中に澱粉を高率配合した場
合には紙腰の改善にはなるものの、得られる塗被紙の平
滑性や光沢が低下するという難点がある。Various proposals have hitherto been made regarding a technique for improving the rigidity of coated paper for printing. For example, a high ratio of softwood pulp (NKP) is mixed in the base paper, a high ratio of starch is mixed in the coating composition, and further, JP-A-6-28.
As disclosed in Japanese Patent No. 7503, the present situation is to achieve the object by, for example, blending a copolymer latex having a high glass transition temperature (hereinafter referred to as Tg) at a high ratio. However, when NKP is blended in a high proportion in the base paper or starch is blended in a high proportion in the coating composition, the paper stiffness is improved, but the smoothness and gloss of the resulting coated paper are reduced. There are difficulties.

【０００５】上記の如き理由から、Ｔｇの高い共重合体
ラテックスを（バインダーとして）高率配合することで
剛度改善の手段とすることが多かった。さらに、Ｔｇの
高い共重合体ラテックスを接着剤として用いたときの長
所である光沢発現性の良さを一段と高めるために、特公
昭５３−７９６４号に開示されているように、グロスキ
ャレンダーあるいはソフトキャレンダーと呼ばれる１０
０℃以上の高温キャレンダー処理により仕上げることが
行われている。For the reasons described above, it is often the case that a high-Tg copolymer latex (as a binder) is blended in a high ratio to improve the rigidity. Further, in order to further enhance the goodness of gloss development which is an advantage when a copolymer latex having a high Tg is used as an adhesive, as disclosed in Japanese Patent Publication No. 53-7964, a gloss calender or a soft calendar is used. 10 called the calendar
Finishing is performed by a high temperature calendering process at 0°C or higher.

【０００６】一方、Ｔｇの高い共重合体ラテックスを用
いると、接着強度が落ち、その結果、塗被層の一部剥離
のような不具合が生ずる。このような不具合を改善する
ために、特開昭５６−６８１８８号には、Ｔｇが３８℃
以上の共重合体ラテックスとＴｇが５〜２５℃の共重合
体ラテックスを併用することが提案されている。しかし
ながら、この方法によっても共重合体ラテックスのＴｇ
が高く、十分な接着強度を発現させるためには、高温キ
ャレンダーの条件を強くする必要があり、その結果、得
られた塗被紙の印刷適性やキャレンダーの操業性が劣る
という問題がある。On the other hand, when a copolymer latex having a high Tg is used, the adhesive strength is lowered and, as a result, problems such as partial peeling of the coating layer occur. In order to improve such a problem, Tg of 38° C. is disclosed in JP-A-56-68188.
It has been proposed to use the above copolymer latex and a copolymer latex having Tg of 5 to 25°C in combination. However, even with this method, the Tg of the copolymer latex is
In order to develop sufficient adhesive strength, it is necessary to strengthen the conditions of the high temperature calender, and as a result, there is a problem that the printability of the coated paper obtained and the operability of the calender are poor. ..

【０００７】高温キャレンダーの操業性について説明し
ておくと、このキャレンダー処理は、前記した共重合体
ラテックスなどの熱可塑性物質を含有する塗被層を設け
た紙匹を高温金属ロールと弾性ロールからなるキャレン
ダーニップ部（加圧下）に通過させて処理するものであ
る。その際、紙匹に付加される高熱圧力によって前記ラ
テックスを可塑化させて塗被層中の顔料を効果的に配向
させたり、あるいは金属ロール表面を写し取ることで高
光沢を有する塗被紙を得ようとする作業である。しか
し、このような加温と加圧手段を採ると、高温の金属ロ
ールや弾性ロールに塗被層が貼り付いたり、塗被層の一
部がロール表面に剥ぎ取られて、製品価値を低下させた
り、ロール汚れを誘発するなどして操業性を低下させる
ことが多かった。Explaining the operability of the high temperature calender, this calendering treatment is performed by elastically treating a paper web provided with a coating layer containing a thermoplastic material such as the above-mentioned copolymer latex with a high temperature metal roll. It is processed by passing it through a calender nip part (under pressure) consisting of rolls. At that time, the latex is plasticized by high heat pressure applied to the web to effectively orient the pigment in the coating layer, or the surface of the metal roll is copied to obtain a coated paper having high gloss. It is a work to try. However, if such heating and pressurizing means is adopted, the coating layer will stick to the high temperature metal roll or elastic roll, or part of the coating layer will be peeled off on the roll surface, reducing the product value. In many cases, operability was deteriorated by causing the stains or inducing roll dirt.

【０００８】また、前記のようなロール汚れや貼り付き
を防止する方法として、塗被組成物中にワックス類、脂
肪酸類、脂肪酸塩類、シリコーン樹脂などの離型剤を配
合したり、あるいは前記離型剤を上記ロール表面に直接
塗布することも行われているが、かかる手段を採用した
ときには、過剰の離型剤がロール表面に堆積したりして
塗被紙の光沢を低下させるという難点を伴う。上記の理
由から、一般に市販されている、本発明が目指すような
光沢の高い高級印刷用塗被紙、所謂スーパーアート紙や
アート紙と呼ばれる高光沢印刷用塗被紙として、剛度の
点ではいずれも満足すべき製品が得られていない。As a method for preventing the above-mentioned roll stains and sticking, a release agent such as waxes, fatty acids, fatty acid salts and silicone resins may be added to the coating composition, or the release agent may be used. Although a mold agent is directly applied to the roll surface, when such a means is adopted, there is a drawback that an excessive amount of the mold release agent is deposited on the roll surface to lower the gloss of the coated paper. Accompany. For the above reasons, as a commercially available, high-gloss high-quality coated paper for which the present invention aims, high-gloss printed coated paper called so-called super art paper or art paper, in terms of rigidity, No satisfactory product has been obtained.

【０００９】この点について付記すると、紙の剛度を示
す指標の一つとしては、ＪＩＳ Ｐ８１４３のＡ法が規
定されており、クラーク法とも呼ばれている。この方法
は、手で紙を持ち上げたときの手触り感（硬さ）に合う
評価法であることが知られている。前記クラーク法で
は、紙を測定したときの突き出し長さＬ（単位：ｃｍ）
を３乗して１００で割った値を剛度（剛度＝Ｌ3 ／１０
０）とすると規定されている。しかしながら、本発明で
は、塗被紙製品の縦目、横目における突き出し長さを測
定し、その平均値を塗被紙の剛度Ｌ（単位：ｍｍ）とし
た。In addition to this point, the A method of JIS P8143 is defined as one of the indexes of the stiffness of paper, and is also called the Clark method. It is known that this method is an evaluation method that matches the feel (hardness) when the paper is lifted by hand. In the Clark method, the protrusion length L (unit: cm) when the paper is measured
To the power of 3 and divided by 100 is the stiffness (stiffness=L 3 /10
0) is specified. However, in the present invention, the protruding lengths of the coated paper product in the longitudinal and lateral directions are measured, and the average value thereof is taken as the stiffness L (unit: mm) of the coated paper.

【００１０】即ち、米坪が異なる塗被紙の剛度を測定す
ると、８０〜１６０ｇ／ｍ2 程度の両面塗被紙では、米
坪と剛度Ｌとの間で直線関係が得られ、米坪の異なる用
紙間で剛度を比較し易いので、本発明では、ＪＩＳ Ｐ
８１４３のＡ法で規定されるクラーク突き出し長さＬを
剛度（単位：ｍｍ）としたのである。一方、光沢度は、
ＪＩＳ Ｐ８１４２に準拠して測定される数値で表すの
が普通であり、本発明では、それによる光沢度が７５％
程度から上の値を示す高光沢印刷用両面塗被紙（前記グ
レードの市販品）を対象に剛度を測定した。その結果、
米坪が１００〜１１０ｇ／ｍ2 程度のもので剛度Ｌは、
概ね１５０〜１７２ｍｍ、１２５〜１３５ｇ／ｍ2 程度
のものでは１６２〜２００ｍｍ、さらに、１５５〜１６
５ｇ／ｍ2 程度のものでは概ね２１０〜２３８ｍｍ程度
に過ぎない。That is, when the stiffness of coated papers having different tsubo is measured, a linear relationship between the tsubo and the stiffness L is obtained for the double-coated paper having a weight of about 80 to 160 g/m 2 , and Since it is easy to compare the rigidity between different papers, the present invention uses JIS P
The Clark protrusion length L defined by the A method of 8143 was defined as the rigidity (unit: mm). On the other hand, the glossiness is
It is usually expressed by a numerical value measured according to JIS P8142, and in the present invention, the glossiness is 75%.
The stiffness was measured for a double-sided coated paper for high gloss printing (commercially available product of the above grade) showing a value from the grade to the above. as a result,
The stiffness L is about 100-110 g/m 2 of tsubo.
About 150 to 172 mm, about 125 to 135 g/m 2 , 162 to 200 mm, and 155 to 16 mm
If it is about 5 g/m 2 , it is only about 210 to 238 mm.

【００１１】そして、前記市販品の米坪と剛度の関係を
グラフにまとめると、図１のとおりで、○印が前記した
市販品、●印が本発明による製品である。両者を比較す
ると、従来から市販されている高級印刷紙と本発明の製
品との間に歴然とした格差が存在し、かくして本発明に
よる高光沢両面塗被紙が、従来市販されたことのない新
規な製品であることがわかる。因みに、図２は米坪１２
７．９ｇ／ｍ2 ベースの前記市販品（○印）と本発明に
よる製品（●印）の双方について、白紙光沢と剛度の関
係を示したグラフで、横軸に光沢度を、縦軸に剛度をお
き、このグラフからも明らかなように、本発明品は市販
品と比較し、同程度の光沢を有しながらも剛度において
は極めて高い数値を示すことがわかる。Then, the relationship between the rice tsubo and the stiffness of the above-mentioned commercial products is summarized in a graph. As shown in FIG. 1, the ○ marks are the above-mentioned commercial products, and the ● marks are the products according to the present invention. Comparing the two, there is a clear difference between the high-quality printing paper which has been commercially available in the past and the product of the present invention, and thus the high-gloss double coated paper according to the present invention has never been commercially available. You can see that it is a good product. By the way, Figure 2 is 12 square meters.
A graph showing the relationship between white paper gloss and rigidity for both the above-mentioned commercial product (○ mark) based on 7.9 g/m 2 and the product (● mark) according to the present invention, where the horizontal axis represents glossiness and the vertical axis represents glossiness. Rigidity is set, and as is clear from this graph, it is understood that the product of the present invention has an extremely high numerical value in rigidity while having the same level of gloss as compared with the commercially available product.

【００１２】[0012]

【発明が解決しようとする課題】本発明は、高温キャレ
ンダーを通すことで優れた光沢、平滑性、同時に紙腰が
強く（剛度が高い）、所謂高級感を呈する印刷用塗被紙
を得るようにすること目的に、顔料塗被層の主成分とな
る顔料と接着剤との関係を精細に検討した結果、顔料に
特定の粒度分布を有するカオリンを使用し、さらに接着
剤として比較的高いＴｇを有する重合体ラテックスを用
いることによって、剛度が高く、その上にキャレンダー
操業性に優れ（塗被層のロール面への貼り付きがな
い）、同時に、高光沢および優れた平滑性を有する印刷
用両面塗被紙を提供するものである。DISCLOSURE OF THE INVENTION The present invention obtains a so-called high-grade coated paper having excellent gloss and smoothness, and at the same time a strong paper stiffness (high rigidity) by passing through a high temperature calender. For that purpose, as a result of a detailed study of the relationship between the pigment, which is the main component of the pigment coating layer, and the adhesive, kaolin having a specific particle size distribution was used as the pigment, and the adhesive was relatively high. By using a polymer latex having Tg, it has high rigidity and excellent calender operability (no sticking of the coating layer to the roll surface), and at the same time has high gloss and excellent smoothness. A double-sided coated paper for printing is provided.

【００１３】[0013]

【課題を解決するための手段】本発明は、原紙上に顔料
および接着剤を主成分とする塗被組成物を両面に塗被、
乾燥した後、１００℃以上の高温キャレンダーに通紙し
て仕上げる印刷用両面塗被紙において、ＪＩＳ Ｐ８１
４３のＡ法に準拠して測定したクラーク突き出し長さの
縦目、横目の平均値Ｌが下記（１）式を満足する印刷用
両面塗被紙であって、 Ｌ ＞ １．２８Ｘ＋４５ （１） 〔ここに、Ｌ＝塗被紙の縦目、および横目におけるクラ
ーク突き出し長さの平均値（単位：ｍｍ）、Ｘ＝製品米
坪（ｇ／ｍ2 ）である〕該塗被紙の両面最外側の塗被層
中に、顔料として平均粒子径が０．５〜１．０μｍ、１
μｍ以下の粒子の含まれる比率が５０〜８０重量％、か
つ３μｍ以上の粒子の含まれる比率が５％以下であるカ
オリンを全顔料に対して４０〜９０重量％含有せしめ、
さらに接着剤としてガラス転移温度が２５〜５０℃であ
る共重合体ラテックス（ａ）を全顔料に対して固形分対
比で５〜３０重量％含有せしめ、かつ片面当たりの該塗
被層の乾燥重量が１２〜３０ｇ／ｍ2 であることを特徴
とする印刷用両面塗被紙である。According to the present invention, a base paper is coated with a coating composition containing a pigment and an adhesive as main components on both sides,
Double-sided coated paper for printing, which is dried and then passed through a high-temperature calender of 100°C or higher, according to JIS P81
A double-sided coated paper for printing, in which the average value L of the grain length and the grain width of the Clark protrusion measured in accordance with the A method of No. 43 satisfies the following formula (1), L> 1.28X+45 (1) [Where, L = average value of Clark protrusion length (unit: mm) in the longitudinal and lateral directions of the coated paper, X = product tsubo (g/m 2 )] Both sides of the coated paper In the outer coating layer, the average particle size of the pigment is 0.5 to 1.0 μm, 1
40 to 90 wt% of kaolin having a proportion of particles of not more than μm of 50 to 80% by weight and a proportion of particles of not less than 3 μm of not more than 5% is contained in all pigments,
Further, a copolymer latex (a) having a glass transition temperature of 25 to 50° C. is contained as an adhesive in an amount of 5 to 30% by weight based on the solid content of all pigments, and the dry weight of the coated layer per one side. Is 12 to 30 g/m 2, which is a double-sided coated paper for printing.

【００１４】[0014]

〔ここに、Ｌ＝剛度（ｍｍ）、Ｘ＝製品米坪（ｇ／ｍ2 ）である〕[Where L=rigidity (mm) and X=product tsubo (g/m 2 )]

【００１５】そして、特定の顔料と接着剤とは下記のと
おりである。即ち、顔料として平均粒子径が０．５〜
１．０μｍ、１μｍ以下の粒子の含まれる比率が５０〜
８０重量％で、かつ３μｍ以上の粒子の含まれる比率が
５％以下であるカオリンを、全顔料に対して４０〜９０
重量％含有せしめ、かつ、接着剤としてＴｇが２５〜５
０℃である共重合体ラテックス（ａ）を使用し、その添
加量を顔料に対して固形分対比で５〜３０重量％とする
ものである。The specific pigment and adhesive are as follows. That is, the average particle size of the pigment is 0.5 to
The ratio of particles of 1.0 μm and 1 μm or less is 50 to 50
Kaolin having a content of particles of 3 μm or more in an amount of 80% by weight and 5% or less is used in an amount of 40 to 90% with respect to all pigments.
It should be contained by weight% and has Tg of 25 to 5 as an adhesive.
The copolymer latex (a) at 0° C. is used, and the addition amount thereof is 5 to 30% by weight based on the solid content of the pigment.

【００１６】なお、本発明においては、顔料として前記
した特定のカオリンと平均粒子径が０．１〜０．５μｍ
のアラゴナイト系の針状軽質炭酸カルシウム（以後、針
状軽質炭酸カルシウムと称す）を併用することができ、
その際の針状軽質炭酸カルシウムの配合比率としては、
全顔料に対して１０〜６０重量％の範囲で含有せしめる
ことができる。このように、特定粒度分布のカオリンと
針状軽質炭酸カルシウムとを前記範囲で併用すること
で、併用しない場合に比べて塗被紙の光沢と接着強度を
より良くバランスさせることができる。In the present invention, the above-mentioned specific kaolin as a pigment and the average particle diameter are 0.1 to 0.5 μm.
Aragonite-based acicular light calcium carbonate (hereinafter referred to as acicular light calcium carbonate) can be used in combination,
As the mixing ratio of acicular light calcium carbonate at that time,
It may be contained in the range of 10 to 60% by weight based on the total pigment. Thus, by using kaolin having a specific particle size distribution and acicular light calcium carbonate in the above range, the gloss and the adhesive strength of the coated paper can be better balanced as compared with the case where they are not used in combination.

【００１７】さらに、接着剤として、Ｔｇが−３０〜５
℃である共重合体ラテックス（ｂ）を混在させ、Ｔｇが
２５〜５０℃である共重合体ラテックス（ａ）およびＴ
ｇが−３０〜５℃である共重合体ラテックス（ｂ）の合
計量が全顔料に対して固形分対比で５〜３０重量％であ
り、かつ（ａ）の共重合体ラテックス（高Ｔｇラテック
スと称す）：（ｂ）の共重合体ラテックス（低Ｔｇラテ
ックスと称す）の配合比率を９：１〜５：５の範囲で調
整することが望ましい。因みに、低Ｔｇラテックス１に
対し、高Ｔｇラテックスが９を越えると、低Ｔｇラテッ
クスによる接着強度による改善効果が得られず、他方低
Ｔｇラテックスの比率が高Ｔｇラテックスより多くなる
と本発明が所望とする剛度が得られなくなる虞れがあ
る。Further, as an adhesive, Tg is -30 to 5
Copolymer latex (b) having a Tg of 25 to 50° C. and T having a copolymer latex (a) and T having a Tg of 25 to 50° C.
The total amount of the copolymer latex (b) in which g is −30 to 5° C. is 5 to 30% by weight based on the solid content with respect to all pigments, and the copolymer latex (a) (high Tg latex). It is desirable to adjust the blending ratio of the copolymer latex (referred to as)) (b) (referred to as low Tg latex) within the range of 9:1 to 5:5. Incidentally, when the ratio of the high Tg latex is more than 9 relative to the low Tg latex 1, the improvement effect due to the adhesive strength due to the low Tg latex cannot be obtained, while when the ratio of the low Tg latex is larger than that of the high Tg latex, the present invention is desired. There is a possibility that the rigidity to be obtained may not be obtained.

【００１８】このように高Ｔｇラテックスと低Ｔｇラテ
ックスを混合使用することにより、高Ｔｇラテックスの
特徴である剛度の高さを維持したまま、接着強度を改善
でき、しかも、低Ｔｇラテックスを前記した範囲で併用
したときには、併用しない場合に比べて塗被紙の剛度と
接着強度をより良く調整できるので、より好ましい実施
態様である。By thus using a mixture of the high Tg latex and the low Tg latex, the adhesive strength can be improved while maintaining the high rigidity, which is a characteristic of the high Tg latex, and the low Tg latex is described above. When it is used together within the range, the rigidity and the adhesive strength of the coated paper can be better adjusted as compared with the case where the combined use is not carried out, which is a more preferable embodiment.

【００１９】また、前記に加えて、上記の高Ｔｇラテッ
クス（ａ）のゲル含有率が３０〜９０重量％、かつ低Ｔ
ｇラテックス（ｂ）のゲル含有率が５０〜９０重量％で
ある共重合体ラテックスを使用することで、塗被紙の光
沢と接着強度をよりよく調整できる。かくして、本発明
によれば、従来の高光沢塗被紙製品には全く見られない
剛度（紙腰）の強い印刷用塗被紙、即ち、前記（１）式
を満たすような剛度の高い印刷用塗被紙が得られ、しか
も、その塗被紙の光沢度が７５％以上、かつスムースタ
平滑度が２０ｍｍＨｇ以下といった、高い光沢と平滑性
を併せ持つ新規な印刷用両面塗被紙を提供し得るのであ
る。In addition to the above, the gel content of the high Tg latex (a) is 30 to 90% by weight, and the low T content is low.
By using a copolymer latex in which the gel content of the g latex (b) is 50 to 90% by weight, the gloss and adhesive strength of the coated paper can be better adjusted. Thus, according to the present invention, a coated paper for printing having a high rigidity (stiffness), which is not found in conventional high-gloss coated paper products, that is, printing with a high rigidity satisfying the above formula (1). A double-sided coated paper for printing having a high gloss and smoothness, such as a coated paper for use, a glossiness of the coated paper of 75% or more, and a smoother smoothness of 20 mmHg or less, can be provided. Of.

【００２０】次に、本発明による印刷用両面塗被紙が、
上述のように優れた品質を有する所以について説明す
る。本発明にあっては、前記のように塗被層を構成する
顔料として、粒度分布が狭い特定のカオリンを用い、か
つこのカオリンに、接着剤として前記した特定の共重合
体ラテックスを併用させたことを特徴とする。そして、
粒度分布の狭い特定のカオリンとは、具体的には平均粒
子径が０．５〜１．０μｍ、１μｍ以下の粒子の含有比
率が５０〜８０重量％で、かつ３μｍ以上の粒子の含有
比率が５％以下であるカオリンである。このようなカオ
リンは、通常、塗被紙に用いられている一般的なカオリ
ンに対比して、粗粒子分、特に光沢や平滑性を低下させ
る度合の大きな３μｍ以上の粒子分が少なく、しかも１
μｍ以下の粒子の含まれる比率が同レベルのものと比較
すると平均粒子径が大きい、換言すると、微粒子分が少
ないのが特徴である。Next, the double-sided coated paper for printing according to the present invention is
The reason why it has excellent quality as described above will be described. In the present invention, as the pigment constituting the coating layer as described above, a specific kaolin having a narrow particle size distribution is used, and this kaolin is used in combination with the specific copolymer latex described above as an adhesive. It is characterized by And
The specific kaolin having a narrow particle size distribution specifically means that the content ratio of particles having an average particle size of 0.5 to 1.0 μm, 1 μm or less is 50 to 80% by weight, and the content ratio of particles of 3 μm or more is. Kaolin which is 5% or less. Such kaolin usually has less coarse particles, particularly particles having a size of 3 μm or more, which greatly reduces gloss and smoothness, as compared with general kaolin used for coated paper, and
It is characterized in that the average particle diameter is large, in other words, the amount of fine particles is small, as compared with particles having the same level of particles having a size of μm or less.

【００２１】このような特定粒度分布を示すカオリンを
塗被層を構成する主な顔料として用いると、通常のカオ
リンを使用した場合に比べて、粗粒子分が少ないので良
好な光沢発現性を有するだけでなく、接着剤を消費して
しまうような微粒子分が少ないので、本発明で使用する
高Ｔｇのラテックスを用いても接着強度が発現し易い。
さらに、塗被層を構成する顔料粒子間の間隙が微粒子分
で埋められることが少なくなり、塗被層の顔料粒子間に
間隙が多く生じる。その結果、高温キャレンダー処理を
行って、密度が１．１５〜１．３５ｇ／ｃｍ3 となるよ
うに処理した後も、塗被層に相当数の間隙が残るので、
吸水着肉性やインキセット性が効果的に改善され、要す
るに印刷適性の優れた製品が得られることになる。When kaolin having such a specific particle size distribution is used as the main pigment constituting the coating layer, it has a smaller amount of coarse particles than in the case of using normal kaolin, and thus has good gloss development. In addition, since the amount of fine particles that consume the adhesive is small, the adhesive strength is likely to be exhibited even when using the high Tg latex used in the present invention.
Furthermore, the gaps between the pigment particles that form the coating layer are less likely to be filled with the fine particles, so that there are many gaps between the pigment particles of the coating layer. As a result, a considerable number of gaps remain in the coating layer even after the high temperature calendering treatment so that the density becomes 1.15 to 1.35 g/cm 3 ,
The flesh-absorbing swimsuit and the ink setting property are effectively improved, and in short, a product having excellent printability is obtained.

【００２２】既述したように、ＪＩＳ Ｐ８１４３のＡ
法に準拠して測定されるクラーク突き出し長さＬは、剛
度を示す一つの指標であって、その値が大きいほど剛度
が高いことを示している。なお、この剛度は、製品米坪
Ｘ（ｇ／ｍ2 ）と相関関係にあり、米坪が高くなると、
それに伴って剛度も必然的に高くなる。本発明によれ
ば、製品米坪Ｘ（ｇ／ｍ2 ）が低い値でありながら、高
い剛度の製品を得ることができる点で有用性が発揮さ
れ、とりわけ、製品米坪に対して塗被量の比率を高くし
易い、米坪が８０〜１６０ｇ／ｍ2 程度の印刷用塗被紙
の場合に真価を発揮する。As described above, A of JIS P8143
The Clark protrusion length L measured according to the method is one index showing the rigidity, and the larger the value, the higher the rigidity. In addition, this rigidity is correlated with the product tsubo, X (g/m 2 ).
Along with that, rigidity also inevitably increases. EFFECTS OF THE INVENTION According to the present invention, the usefulness is exhibited in that a product having a high rigidity can be obtained even though the product has a low value of rice tsubo X (g/m 2 ). It exhibits its true value in the case of a coated paper having a weight of 80 to 160 g/m 2, which is easy to increase the amount ratio.

【００２３】前述のとおり、本発明では剛度の高い、高
品質の両面塗被紙を得ようとするものであるが、高い剛
度に加えて、塗被紙の光沢度が７５％以上の高光沢とス
ムースタ平滑度が２０ｍｍＨｇ以下の高い平滑性を有す
る塗被紙を得ようとするものであり、以下に、この塗被
紙の光沢、平滑性と塗被紙の剛度との関係について述べ
る。一般に、キャレンダーなどの加圧処理を強くきかし
て高光沢を得ようとする場合には、剛度は低下する。本
発明の場合は市販の高級印刷用紙が具備する程度の高光
沢、高平滑性を保持させながら、しかも、高い剛度を有
する印刷用両面塗被紙を提供するところに特徴を有す
る。即ち、キャレンダーでの加圧処理を強化させたとき
にも、塗被層を構成する顔料が粒度分布の狭い特定のカ
オリン、または、該カオリンと前記針状軽質炭酸カルシ
ウムの併用であり、かつ接着剤として前記した高Ｔｇラ
テックス、または、該ラテックスと低Ｔｇラテックスと
を併用することによって、高光沢、高平滑性を保持しな
がら、従来品に比較してはるかに高い剛度を具備させる
ことに成功したのである。As described above, the present invention is intended to obtain high-quality double-sided coated paper with high rigidity. In addition to high rigidity, the coated paper has a high gloss of 75% or more. And smoother smoothness is to obtain a coated paper having high smoothness of 20 mmHg or less. The relationship between the gloss and smoothness of the coated paper and the stiffness of the coated paper will be described below. In general, the rigidity is lowered when a pressure treatment such as a calender is strongly used to obtain high gloss. The present invention is characterized in that it provides a double-sided coated paper for printing which has high rigidity while maintaining high gloss and high smoothness that are possessed by commercially available high-grade printing paper. That is, even when the pressure treatment in the calender is enhanced, the pigment constituting the coating layer is a specific kaolin having a narrow particle size distribution, or a combination of the kaolin and the acicular light calcium carbonate, and By using the above-mentioned high Tg latex or a combination of the latex and the low Tg latex as an adhesive, it is possible to provide a much higher rigidity than conventional products while maintaining high gloss and high smoothness. It succeeded.

【００２４】塗被紙の剛度Ｌ（ｍｍ）が、前記（１）式
を満足しない場合は、従来の塗被紙との差が小さく、雑
誌やカタログ等の本文用紙に用いても、それらに十分な
硬さ、所謂本発明でいう高級感、あるいは重量感を付与
できない。一方、剛度Ｌの上限値は特に限定されない
が、製品の取扱い面や印刷あるいは用途面から下記
（２）式を満足するような値を取ることが望ましい。 Ｌ ≦ １．２８Ｘ＋１００ （２） なお、Ｌ＝剛度（ｍｍ）、Ｘ＝製品米坪（ｇ／ｍ2 ） 因みに、剛度Ｌが上記（２）式より外れるようになる
と、塗被層が剛直で、固くなり過ぎ、仕上げ工程での断
裁作業に際し、もしくは印刷時に紙粉が発生したり、あ
るいは製本時に折り割れが発生するなどして商品価値を
失ってしまう恐れがある。When the stiffness L (mm) of the coated paper does not satisfy the above formula (1), the difference from the conventional coated paper is small, and even if it is used for the text paper such as magazines and catalogs, Sufficient hardness, so-called high-class feeling or heavy feeling in the present invention cannot be imparted. On the other hand, the upper limit of the rigidity L is not particularly limited, but it is desirable to take a value that satisfies the following formula (2) from the viewpoint of handling the product, printing or application. L ≦ 1.28X+100 (2) L=rigidity (mm), X=product tsubo (g/m 2 ) By the way, when the rigidity L deviates from the above formula (2), the coating layer becomes rigid. However, the product value may be lost because it becomes too hard, paper dust is generated during cutting work in the finishing process, or during printing, or creases are generated during bookbinding.

【００２５】既述したように、本発明にあっては塗被層
を構成する塗料に配合する顔料として、平均粒子径がが
０．５〜１．０μｍ、１μｍ以下の粒子の含有比率が５
０〜８０重量％で、かつ３μｍ以上の粒子の含有比率が
５％以下であるカオリンを塗料中の全顔料に対し、固形
分対比で４０〜９０重量％配合することが１つの特徴で
ある。因みに、平均粒子径が１．０μｍを越えると、即
ち、１．０μｍ以下の粒子の含まれる比率が５０重量％
未満の場合、あるいは３μｍ以上の粒子の比率が５％を
越えると、塗被紙の光沢が低下すると共に、塗被層面の
平滑性が低下する。一方、平均粒子径が０．５μｍ未
満、あるいは１．０μｍ以下の粒子の含まれる比率が８
０重量％を越えると、顔料の接着剤消費量が多くなり、
本発明のようなガラス転移温度が高い共重合体ラテック
スを用いた場合十分な接着強度が得られない。As described above, in the present invention, as the pigment to be mixed in the coating material constituting the coating layer, the content ratio of particles having an average particle diameter of 0.5 to 1.0 μm and 1 μm or less is 5.
One of the characteristics is that kaolin having a content of particles of 0 to 80% by weight and having a particle size of 3 μm or more of 5% or less is mixed with 40 to 90% by weight based on the solid content with respect to all pigments in the paint. By the way, when the average particle size exceeds 1.0 μm, that is, the ratio of particles of 1.0 μm or less is 50% by weight.
If it is less than 5% or if the proportion of particles having a particle size of 3 μm or more exceeds 5%, the gloss of the coated paper is lowered and the smoothness of the coated layer surface is lowered. On the other hand, the ratio of particles having an average particle size of less than 0.5 μm or 1.0 μm or less is 8
If it exceeds 0% by weight, the adhesive consumption of the pigment increases,
When the copolymer latex having a high glass transition temperature as in the present invention is used, sufficient adhesive strength cannot be obtained.

【００２６】さらに、このような特定のカオリンを全顔
料に対し、固形分対比で４０〜９０重量％の比率で配合
することが重要である。因みに、４０重量％未満の場合
には、接着強度が低下する、あるいは顔料塗被層中に形
成される顔料粒子間の間隙が減少し、吸水着肉性の悪
化、インキセットの遅延化等が誘発され、印刷適性が低
下する。他方、９０重量％を越えると、水性塗料の粘度
が高くなり、高濃度の水性塗料を調製できなくなる結
果、塗被紙の平滑性が低下する。Further, it is important to add such a specific kaolin to the total pigment in a ratio of 40 to 90% by weight based on the solid content. By the way, when the content is less than 40% by weight, the adhesive strength is lowered, or the gaps between the pigment particles formed in the pigment coating layer are decreased, so that the fleshness of the swimsuit is deteriorated and the ink set is delayed. It is induced and printability is reduced. On the other hand, when it exceeds 90% by weight, the viscosity of the water-based paint becomes high and it becomes impossible to prepare a high-concentration water-based paint, resulting in deterioration of the smoothness of the coated paper.

【００２７】なお、平均粒子径が０．１〜０．５μｍの
針状軽質炭酸カルシウムを、前記特定のカオリンと併用
すると、塗被層の顔料間の間隙を一層多くでき、かつ接
着剤消費量が少なく、本発明に係る高Ｔｇラテックスを
接着剤として使用した場合に接着強度が発現し易く、高
い光沢も得られるので、特に好ましい態様となり得るも
のである。因みに、針状軽質炭酸カルシウムの平均粒子
径が０．１μｍ未満では、顔料の接着剤消費量が多くな
り、本発明で使用する高Ｔｇラテックスを用いた場合十
分な接着強度が得られず、一方、０．５μｍを越える
と、塗被紙の白紙光沢が低下すると共に、塗被面の平滑
性不足が懸念される。このような特定形状の軽質炭酸カ
ルシウムを、全顔料に対し、固形分対比で１０〜６０重
量％の範囲で併用することが好ましい。因みに、配合比
率が６０重量％を越えると、水性塗料の粘度が高くな
り、高濃度の水性塗料を調製できなくなる結果、塗被紙
の平滑性が低下する虞れがある。また、１０重量％未満
の配合量では、印刷適性、特に吸水着肉性の悪化、イン
キセットの遅延化などが発生する懸念がある。When acicular light calcium carbonate having an average particle diameter of 0.1 to 0.5 μm is used in combination with the above-mentioned specific kaolin, the gap between the pigments in the coating layer can be further increased and the adhesive consumption amount can be increased. Is low, and when the high Tg latex according to the present invention is used as an adhesive, adhesive strength is likely to be exhibited and high gloss is also obtained, which is a particularly preferable embodiment. By the way, when the average particle size of the acicular light calcium carbonate is less than 0.1 μm, the adhesive consumption of the pigment increases, and when the high Tg latex used in the present invention is used, sufficient adhesive strength cannot be obtained. , 0.5 μm, the white paper gloss of the coated paper decreases, and the smoothness of the coated surface may be insufficient. It is preferable to use light calcium carbonate having such a specific shape in combination within the range of 10 to 60% by weight based on the solid content with respect to all pigments. Incidentally, if the blending ratio exceeds 60% by weight, the viscosity of the water-based paint becomes high and it becomes impossible to prepare a high-concentration water-based paint, and as a result, the smoothness of the coated paper may be deteriorated. Further, if the blending amount is less than 10% by weight, there is a concern that the printability, particularly the fleshness of the swimsuit, may be deteriorated and the ink set may be delayed.

【００２８】次に、本発明における第２の構成要件であ
る接着剤について述べる。上記特定の顔料と併用される
接着剤としては、少なくともＴｇが２５〜５０℃である
重合体ラテックスを、塗料中の顔料に対し、固形分対比
で５〜３０重量％となるように配合するものである。因
みに、前記特定の高ＴｇラテックスのＴｇが２５℃未満
の場合には、高温キャレンダー処理しても高い剛度と光
沢が得られず、他方、５０℃を越えると、高温キャレン
ダー処理しても十分な接着強度が得られない。また、上
記高Ｔｇラテックスが塗料中の顔料に対し、５重量％未
満の場合は、塗被層の接着強度が不足し、一方、３０重
量％を越えると、インキセットの遅延化あるいは吸水着
肉性の低下などを招き、結果的に印刷適性が悪化する。Next, the adhesive which is the second constituent requirement of the present invention will be described. As the adhesive used in combination with the above specific pigment, a polymer latex having at least Tg of 25 to 50° C. is blended so as to be 5 to 30% by weight based on the solid content with respect to the pigment in the paint. Is. By the way, when the Tg of the specific high Tg latex is less than 25° C., high rigidity and gloss cannot be obtained even by high temperature calendering, while when it exceeds 50° C., even if high temperature calendering is performed. Sufficient adhesive strength cannot be obtained. If the content of the high Tg latex is less than 5% by weight of the pigment in the paint, the adhesive strength of the coating layer is insufficient. On the other hand, if it exceeds 30% by weight, the ink set may be delayed or the absorbent swimwear meat may be damaged. The printability is deteriorated, resulting in deterioration of printability.

【００２９】本発明においては、前記した特定の高Ｔｇ
ラテックスと、さらにＴｇが−３０〜５℃である低Ｔｇ
ラテックスの２種類のラテックスを併用することによっ
て、光沢や平滑性および紙腰（剛度）をより効果的に調
整することができるので、好ましい実施態様となるもの
である。なお、前記高Ｔｇラテックスとしては、そのゲ
ル含有量が３０〜９０重量％のものを使用することが望
ましい。因みに、ゲル含有量が３０重量％未満では、接
着強度が劣るだけでなく、高温キャレンダー処理に当た
り、ロール汚れが発生し易くなる恐れがある。一方、９
０重量％を越えると、高温キャレンダー処理しても十分
な光沢が得られない恐れがある。また、前記低Ｔｇラテ
ックスとしては、そのゲル含有量が５０〜９０重量％の
ものを使用することが好ましい。即ち、ゲル含有量が５
０重量％未満では、高Ｔｇラテックスと併用しても接着
強度の改善効果が期待できない恐れがあり、一方９０重
量％を越えると、高温キャレンダー処理しても十分な光
沢が得られない恐れがある。In the present invention, the specific high Tg described above is used.
Latex and low Tg with Tg of -30 to 5°C
By using two kinds of latex in combination, the gloss, smoothness and paper stiffness (stiffness) can be adjusted more effectively, which is a preferred embodiment. The high Tg latex preferably has a gel content of 30 to 90% by weight. Incidentally, if the gel content is less than 30% by weight, not only the adhesive strength is deteriorated, but also roll contamination may be likely to occur during the high temperature calender treatment. On the other hand, 9
If it exceeds 0% by weight, sufficient gloss may not be obtained even by high-temperature calendering. The low Tg latex preferably has a gel content of 50 to 90% by weight. That is, the gel content is 5
If it is less than 0% by weight, the effect of improving the adhesive strength may not be expected even if it is used in combination with a high Tg latex, while if it exceeds 90% by weight, sufficient gloss may not be obtained even by high temperature calender treatment. is there.

【００３０】これら高Ｔｇラテックスとしては、例えば
酢酸ビニル重合体、エチレン−酢酸ビニル共重合体、エ
チレン−塩化ビニル−酢酸ビニル共重合体、酢酸ビニル
−アクリル共重合体などの酢酸ビニル系重合体ラテック
スやスチレン−ブタジエン共重合体、メチルメタクリレ
ート−ブタジエン共重合体などの共役ジエン系共重合体
ラテックス、アクリル酸エステルおよび／またはメタク
リル酸エステルの重合体または共重合体などのアクリル
系重合体ラテックスなど、あるいはこれらの各種共重合
体ラテックスを、カルボキシル基等の官能基含有単量体
で変性したアルカリ部分溶解性あるいはアルカリ非溶解
性の共重合体ラテックスを例示できる。Examples of the high Tg latex include vinyl acetate polymer latex such as vinyl acetate polymer, ethylene-vinyl acetate copolymer, ethylene-vinyl chloride-vinyl acetate copolymer and vinyl acetate-acrylic copolymer. And styrene-butadiene copolymer, conjugated diene-based copolymer latex such as methyl methacrylate-butadiene copolymer, acrylic polymer latex such as acrylic acid ester and / or methacrylic acid ester polymer or copolymer, Alternatively, an alkali partially soluble or alkali insoluble copolymer latex obtained by modifying these various copolymer latexes with a monomer containing a functional group such as a carboxyl group can be used.

【００３１】低Ｔｇラテックスとしては、前記したよう
にＴｇが−３０〜５℃の共重合体ラテックスを使用する
ことが好ましい。因みに、Ｔｇが５℃を越えると、高Ｔ
ｇラテックスと併用しても接着強度を改善できない虞れ
があり、一方、−３０℃未満では、最終製品である印刷
用塗被紙の剛度が大きく低下する虞れがある。As the low Tg latex, it is preferable to use a copolymer latex having a Tg of −30 to 5° C. as described above. By the way, if Tg exceeds 5°C, high T
Even if it is used together with g latex, the adhesive strength may not be improved, while if it is lower than −30° C., the rigidity of the final coated paper for printing may be significantly reduced.

【００３２】これら低Ｔｇラテックスとしては、例えば
エチレン−酢酸ビニル共重合体、エチレン−塩化ビニル
−酢酸ビニル共重合体、酢酸ビニル−アクリル共重合体
などの酢酸ビニル系重合体ラテックスやスチレン−ブタ
ジエン共重合体、メチルメタクリレート−ブタジエン共
重合体などの共役ジエン系共重合体ラテックス、アクリ
ル酸エステルおよび／またはメタクリル酸エステルの重
合体または共重合体などのアクリル系重合体ラテックス
など、あるいはこれらの各種重合体ラテックスを、カル
ボキシル基等の官能基含有単量体で変性したアルカリ部
分溶解性あるいはアルカリ非溶解性の共重合体ラテック
スを例示できる。Examples of the low Tg latex include vinyl acetate polymer latex such as ethylene-vinyl acetate copolymer, ethylene-vinyl chloride-vinyl acetate copolymer, vinyl acetate-acrylic copolymer, and styrene-butadiene copolymer. Polymers, conjugated diene copolymer latexes such as methyl methacrylate-butadiene copolymers, acrylic polymer latexes such as polymers or copolymers of acrylic acid esters and/or methacrylic acid esters, and various types thereof. An example is an alkali partially soluble or alkali insoluble copolymer latex obtained by modifying the combined latex with a monomer containing a functional group such as a carboxyl group.

【００３３】高、低Ｔｇラテックスの製造方法として
は、例えば連続乳化重合法、一括乳化重合法、２段乳化
重合法、分割乳化重合法など、公知の乳化重合法が採用
でき、特に限定されるものではない。なお、乳化重合に
際し、公知の乳化剤、連鎖移動剤、重合開始剤、キレー
ト化剤などの一般の乳化重合に用いられる添加剤、助剤
が使用できる。そして、所要のＴｇを得る方法として
は、重合に供する単量体（モノマー）の選択、あるいは
共重合におけるモノマーの組合わせ、共重合割合などを
操作することによって調整することができる。As the method for producing the high and low Tg latex, known emulsion polymerization methods such as continuous emulsion polymerization method, batch emulsion polymerization method, two-step emulsion polymerization method and divided emulsion polymerization method can be adopted and are not particularly limited. Not a thing. At the time of emulsion polymerization, known additives such as emulsifiers, chain transfer agents, polymerization initiators, chelating agents and the like used in general emulsion polymerization can be used. The method for obtaining the required Tg can be adjusted by selecting the monomers (monomers) to be subjected to the polymerization, or combining the monomers in the copolymerization, the copolymerization ratio, and the like.

【００３４】なお、塗料に配合される接着剤としては、
上記特定の共重合体ラテックス以外に、例えばカゼイ
ン、大豆蛋白、合成蛋白等の蛋白類；ポリビニルアルコ
ール、オレフィン−無水マレイン酸樹脂、メラミン樹脂
等の合成樹脂系接着剤；酸化澱粉、熱化学変性澱粉等の
澱粉類；カルボキシメチルセルロース、ヒドロキシエチ
ルセルロース等のセルロース誘導体等の如き通常の接着
剤を、本発明の所望の効果を損なわない範囲で適宜併用
することができる。As an adhesive to be mixed with the paint,
In addition to the above specific copolymer latex, proteins such as casein, soybean protein, and synthetic protein; synthetic resin adhesives such as polyvinyl alcohol, olefin-maleic anhydride resin, and melamine resin; oxidized starch, thermochemically modified starch Ordinary adhesives such as starches such as; and cellulose derivatives such as carboxymethyl cellulose, hydroxyethyl cellulose and the like can be appropriately used in combination as long as the desired effects of the present invention are not impaired.

【００３５】塗料の主成分の一つである顔料としては、
前記した特定のカオリンや軽質炭酸カルシウム以外に、
例えば、前記特定の粒度分布を外れるカオリンや、特定
の粒子径や形状を外れる軽質炭酸カルシウム、水酸化ア
ルミニウム、重質炭酸カルシウム、二酸化チタン、タル
ク、サチンホワイト、焼成カオリン、有機顔料等の少な
くとも１種を本発明の所望の効果を損なわない範囲で適
宜併用することができる。As the pigment which is one of the main components of the paint,
Besides the specific kaolin and light calcium carbonate mentioned above,
For example, at least one of kaolin having a specific particle size distribution and light calcium carbonate having a specific particle size or shape, aluminum hydroxide, heavy calcium carbonate, titanium dioxide, talc, satin white, calcined kaolin, organic pigment, and the like. The seeds can be appropriately used in combination as long as the desired effects of the present invention are not impaired.

【００３６】また、塗料中には必要に応じて、例えば耐
水化剤、消泡剤、離型剤、流動変性剤等の各種助剤が適
宜配合され、塗料の原紙上での不動化を促進する助剤と
して、例えばアミン、アミド、ポリアクリルアミン等や
亜鉛、アルミニウム、マグネシウム、カルシウム、バリ
ウム等の多価金属の塩を顔料に対して０．１〜１０重量
％程度添加でき、仕上り固形分濃度が４５〜７０重量％
の水性塗料として調製される。If necessary, various auxiliaries such as a water-proofing agent, a defoaming agent, a release agent, and a flow modifier are appropriately blended in the paint to promote immobilization of the paint on the base paper. As an auxiliary agent, for example, amine, amide, polyacrylamine, etc. or a salt of polyvalent metal such as zinc, aluminum, magnesium, calcium, barium, etc. can be added in an amount of about 0.1 to 10% by weight based on the pigment. Concentration is 45-70% by weight
It is prepared as a water-based paint.

【００３７】かくして調製された塗料は、一般の印刷用
塗被紙の製造分野で用いられるコーター、例えばブレー
ドコーター、エアナイフコーター、ロールコーター、リ
バースロールコーター、バーコーター、カーテンコータ
ー、ダイスロットコーター、グラビアコーター、チャン
プレックスコーター、サイズプレスコーター等の塗被装
置を設けたオンマシンあるいはオフマシンコーターによ
って、乾燥後の塗被量が片面当たり１２〜３０ｇ／ｍ2
となるように、塗被紙の両側最外層として塗被、乾燥さ
れる。因みに、塗被量が１２ｇ／ｍ2 未満では、塗被紙
の剛度を本発明が所望するレベルまで改善することが難
しく、一方、３０ｇ／ｍ2 を越えると、断裁時の紙粉の
発生が増えたり、製本等の後加工において折り割れが発
生し易くなるので好ましくない。The thus-prepared coating composition is a coater used in the field of producing general coated paper for printing, for example, a blade coater, an air knife coater, a roll coater, a reverse roll coater, a bar coater, a curtain coater, a die slot coater, a gravure coater. With an on-machine or off-machine coater equipped with a coating device such as a coater, a chanplex coater, or a size press coater, the coating amount after drying is 12 to 30 g/m 2 per side.
So that the outermost layers on both sides of the coated paper are coated and dried. By the way, if the coating amount is less than 12 g/m 2 , it is difficult to improve the rigidity of the coated paper to a level desired by the present invention, while if it exceeds 30 g/m 2 , paper dust is generated during cutting. It is not preferable because the number of folds increases or breaks easily occur in post-processing such as bookbinding.

【００３８】また、原紙上に塗被された湿潤塗料を乾燥
する方法としては、例えば蒸気加熱シリンダー、加熱熱
風エアードライヤー、ガスヒータードライヤー、電気ヒ
ータードライヤー、赤外線ヒータードライヤー、高周波
ヒータードライヤー等、あるいは、レーザー加熱、電子
線加熱、誘電加熱等各種の方法が単独または併用して採
用される。乾燥条件としては、湿潤状態の塗被層の温度
が、接着剤として使用している高ＴｇラテックスのＴｇ
以上となることが必要であり、例えば、加熱熱風ドライ
ヤーの場合、熱風温度１２０〜１８０℃、熱風の流速２
０〜６０ｍ／秒の範囲が好ましく使用される。なお、乾
燥時に湿潤塗料の温度が接着剤として使用している高Ｔ
ｇラテックスのＴｇ以下の場合、即ち、高Ｔｇラテック
スのＴｇ以下で乾燥されると、高Ｔｇラテックスが接着
剤として作用しないまま乾燥されることとなり、その結
果、乾燥後の高温キャレンダー処理時に塗被層が高温の
ロールによって剥離されるなどして、高温キャレンダー
の操業性が著しく低下する。As a method for drying the wet paint applied on the base paper, for example, a steam heating cylinder, a heated hot air dryer, a gas heater dryer, an electric heater dryer, an infrared heater dryer, a high frequency heater dryer, or the like, or Various methods such as laser heating, electron beam heating, and dielectric heating can be used alone or in combination. The drying condition is that the temperature of the coating layer in the wet state is Tg of the high Tg latex used as the adhesive.
It is necessary to be the above. For example, in the case of a heated hot air dryer, the hot air temperature is 120 to 180° C. and the hot air flow rate is 2
A range of 0 to 60 m/sec is preferably used. It should be noted that the temperature of the wet paint when dried is high T
When the Tg is less than the Tg of the g-latex, that is, when it is dried at the Tg of the high-Tg latex or less, the high-Tg latex is dried without acting as an adhesive. The operability of the high temperature calender is remarkably deteriorated because the layer is peeled off by a high temperature roll.

【００３９】原紙の抄紙方法については、特に限定され
るものではなく、一般に行われている酸性抄紙、中性抄
紙、アルカリ性抄紙など、いずれであってもよく、さら
には原料として高歩留パルプを含む中質原紙も使用でき
る。勿論、各種の回収古紙含有パルプも使用できる。ま
た、サイズプレス、ビルブレード、ロールコーター、ゲ
ートロール、ブレードコーター等のサイズプレスやコー
ターで顔料および接着剤、その他助剤等からなる塗料
を、予め予備塗工した下塗り塗被原紙も適宜使用でき
る。The papermaking method of the base paper is not particularly limited, and may be any of commonly used acidic papermaking, neutral papermaking, alkaline papermaking, etc., and high yield pulp is used as a raw material. It is also possible to use medium-quality base paper containing it. Of course, various recovered waste paper-containing pulps can also be used. In addition, a base coat pre-coated with a coating consisting of a pigment and an adhesive, and other auxiliaries with a size press or coater such as a size press, bill blade, roll coater, gate roll, blade coater, etc. in advance can also be appropriately used. ..

【００４０】かくして得られた両面塗被紙は、１００℃
以上に加熱された高温キャレンダーに通紙して仕上げら
れる。即ち、１００〜３００℃に加熱された金属ロール
と弾性ロールから構成されるニップを１回以上通過する
ことで、高光沢で高平滑を有する塗被紙に仕上げられる
ものであって、所望の光沢、平滑性が得られるように、
キャレンダー線圧、ニップ通過数、通紙速度等が適宜調
整される。なお、仕上げ両面塗被紙の密度として、１．
１５〜１．３５ｇ／ｃｍ3 となるように、高温キャレン
ダー処理するものである。因みに、密度が１．１５ｇ／
ｃｍ3 未満では、本発明が所望とする光沢や平滑性が得
られず、さらには塗被層の接着強度が低下する虞れがあ
り、一方、１．３５ｇ／ｃｍ3 を越えると、塗被層が緻
密化し過ぎて顔料間の間隙が大幅に減少し、吸水着肉性
の悪化やインキセットの遅延化等印刷適性が低下する虞
れがある。The double-coated paper thus obtained has a temperature of 100° C.
The paper is passed through the high temperature calender heated above and finished. That is, a coated paper having a high gloss and a high smoothness can be finished by passing through a nip composed of a metal roll heated to 100 to 300° C. and an elastic roll one or more times. , So that smoothness is obtained,
The calender line pressure, the nip passage number, the sheet passing speed, etc. are adjusted appropriately. The density of the finished double-sided coated paper was 1.
A high temperature calender treatment is performed so that the weight becomes 15 to 1.35 g/cm 3 . By the way, the density is 1.15g/
is less than cm 3, the present invention can not be obtained glossiness and smoothness of the desired, more there is a possibility that the adhesion strength of the coated layer is lowered, while when it exceeds 1.35 g / cm 3, coated There is a possibility that the layer becomes too dense and the gaps between the pigments are greatly reduced, and the printability such as the deterioration of the fleshness of the swimsuit and the delay of the ink set is deteriorated.

【００４１】なお、キャレンダー（装置）としては、例
えばグロスキャレンダー、ソフトキャレンダー、あるい
は紙パルプ技術タイムス３９巻３号、１２頁（１９９６
年）に紹介されているようなヤヌスコンセプトキャレン
ダーなどの加熱可能な金属ロールまたはドラムと弾性ロ
ールから構成される、各種のキャレンダーがオンマシン
やオフマシンの形態で適宜使用される。そして、ここで
いうオンマシンキャレンダーは抄紙機に限らず、塗工機
に組込まれたオンマシンキャレンダーも含まれる。上記
キャレンダーの加熱金属ロールと対をなして使用される
弾性ロールはウレタン樹脂、エポキシ樹脂、ポリアミド
樹脂、フェノール樹脂、ポリアクリレート樹脂等の樹脂
ロール、コットン、ナイロン、アラミド繊維等を使用し
て成形されたロールが適宜使用される。The calender (apparatus) is, for example, a gross calender, a soft calender, or paper pulp technology Times Vol. 39, No. 3, page 12 (1996).
Various calenders composed of heatable metal rolls or drums and elastic rolls, such as the Janus Concept calender as introduced in (1), are appropriately used in the form of on-machine or off-machine. The on-machine calender referred to here is not limited to a paper machine, but includes an on-machine calender incorporated in a coating machine. The elastic roll used as a pair with the heating metal roll of the above calender is formed by using a resin roll of urethane resin, epoxy resin, polyamide resin, phenol resin, polyacrylate resin, etc., cotton, nylon, aramid fiber, etc. The rolled roll is used as appropriate.

【００４２】また、弾性ロールの硬度については高温、
高圧下での耐久性、および耐熱性に耐えるものであっ
て、かつ高い光沢および平滑性を付与できることが重要
であり、ショアーＤ硬度で８５〜９５度程度のロールで
あって、例えばその表面粗さとしてＲｍａｘが５μｍ以
下、好ましくは３μｍ以下にまで研磨したものが好まし
く使用される。The hardness of the elastic roll is high,
It is important that it can withstand durability under high pressure and heat resistance, and can impart high gloss and smoothness, and it is a roll having a Shore D hardness of about 85 to 95 degrees. What is polished to Rmax of 5 μm or less, preferably 3 μm or less is preferably used.

【００４３】[0043]

【実施例】以下に実施例を挙げて本発明を具体的に説明
するが、勿論、本発明はそれらに限定されるものではな
い。また、例中の「部」および「％」は特に断らない限
り、それぞれ「重量部」および「重量％」を示す。な
お、評価方法は下記に示すとおりである。The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto. Unless otherwise specified, "parts" and "%" in the examples mean "parts by weight" and "% by weight", respectively. The evaluation method is as shown below.

【００４４】実施例１ 〔塗料の調製〕顔料として、平均粒子径が０．５μｍ、
１μｍ以下の粒子の含有率が７０％、３μｍ以上の粒子
の含有率が３％であるカオリン（商品名：エクリプス７
７００／エンゲルハード社）７０部と平均粒子径が０．
２μｍのアラゴナイト系針状軽質炭酸カルシウム（商品
名：ＴＰ−１２３ＣＳ／奥多摩工業社）２８部、有機顔
料（商品名：ローペイクＨＰ−９１／ローム＆ハース
社）２部を使用し、分散剤として顔料に対してポリアク
リル酸ソーダを０．２部添加し、コーレス分散機を用い
て固形分濃度が６８％の顔料スラリーを調製した。Example 1 [Preparation of coating material] A pigment having an average particle size of 0.5 μm,
Kaolin having a content of particles of 1 μm or less of 70% and a content of particles of 3 μm or more of 3% (trade name: Eclipse 7
(700/Engelhard Co., Ltd.) 70 parts and an average particle size of 0.
28 parts of 2 μm aragonite-based acicular light calcium carbonate (trade name: TP-123CS/Okutama Kogyo Co., Ltd.) and 2 parts of organic pigment (trade name: Ropaik HP-91/Rohm & Haas) are used as a dispersant. On the other hand, 0.2 part of sodium polyacrylate was added, and a pigment slurry having a solid content concentration of 68% was prepared using a Choles disperser.

【００４５】かくして得られたスラリーに高Ｔｇラテッ
クスとして、Ｔｇが３５℃、ゲル含有量が８０％のスチ
レン−ブタジエン共重合体ラテックス（商品名：Ｐ−３
２４８／住化Ａ＆Ｌ社）を固形分換算で１５．３部、お
よび低Ｔｇラテックスとして、Ｔｇが−５℃、ゲル含有
量９０％のスチレン−ブタジエン共重合体ラテックス
（商品名：ＳＮ−１０１Ｂ／住化Ａ＆Ｌ社）を固形分換
算で１．７部、熱化学変性澱粉（未変性トウモロコシ澱
粉１００部に対して過硫酸アンモニウム０．１５部、炭
酸ナトリウム０．０５部を添加した、濃度３５％の澱粉
スラリーを熱化学変性装置で温度１５５℃、滞留時間５
分で糊化、変性した後、水酸化ナトリウムを澱粉１００
部に対して０．２５部添加して得た澱粉糊液）を固形分
換算で２部、離型剤としてステアリン酸カルシウム（商
品名：ノプコートＣ−１０４ＨＳ／サンノプコ社）を固
形分換算で０．３部添加し、さらに、水を加えて固形分
濃度６０％の塗料を調製した。A styrene-butadiene copolymer latex having a Tg of 35° C. and a gel content of 80% (trade name: P-3) was added to the slurry thus obtained as a high Tg latex.
248/Sumika A&L Co., Ltd. as 15.3 parts in terms of solid content, and as a low Tg latex, Tg is −5° C., styrene-butadiene copolymer latex having a gel content of 90% (trade name: SN-101B/ Sumika A&L Co., 1.7 parts in terms of solid content, thermochemically modified starch (0.15 parts of ammonium persulfate and 0.05 parts of sodium carbonate to 100 parts of unmodified corn starch) were added, and the concentration was 35%. The starch slurry was thermochemically modified at a temperature of 155°C and a residence time of 5
After gelatinizing and denaturing in minutes, sodium hydroxide is added to starch 100
2 parts by weight of starch paste solution obtained by adding 0.25 parts to solids, and calcium stearate (trade name: Nopcoat C-104HS/San Nopco Co., Ltd.) as a release agent in solid content of 2 parts. 3 parts was added, and water was further added to prepare a coating material having a solid content concentration of 60%.

【００４６】〔塗工〕次いで、この塗料を中性抄紙で抄
造された米坪７８ｇ／ｍ2 の上質原紙上に、乾燥後の塗
被量が片面当たり２５ｇ／ｍ2 となるように、熱風温度
が１４５℃の熱風乾燥機を備えたブレードコーターを用
いて両面に塗被、乾燥した。[Coating] Then, this coating material was applied to a high quality base paper of 78 g/m 2 having a basis weight of paper produced by neutral papermaking, so that the coating amount after drying was 25 g/m 2 per side. Both sides were coated and dried using a blade coater equipped with a hot air dryer having a temperature of 145°C.

【００４７】〔ソフトキャレンダー仕上げ〕このように
して得た両面塗被紙を表面温度が１５０℃のクロムメッ
キ仕上げした金属ロールとショアーＤ硬度が９１°の樹
脂製弾性ロールの組合わせからなるニップを、線圧２５
０ＫＮ／ｍ、速度４５０ｍ／分で表、裏それぞれの面が
２回ずつ金属ロール面に接触するように通紙して印刷用
両面塗被紙を得た。[Soft Calender Finish] A nip composed of a combination of a metal roll having a surface temperature of 150° C. and a chrome-plated metal roll of the double-coated paper thus obtained, and a resin elastic roll having a Shore D hardness of 91°. Line pressure 25
A double-sided coated paper for printing was obtained by passing the paper at 0 KN/m and a speed of 450 m/min so that the front and back surfaces contacted the metal roll surface twice each.

【００４８】実施例２ 実施例１において、塗被条件として、原紙米坪を６３ｇ
／ｍ2 、乾燥後の片面当たりの塗被量を２１ｇ／ｍ2 に
変更した以外は、実施例１と同様にして印刷用両面塗被
紙を得た。Example 2 In Example 1, as a coating condition, 63 g of rice slab of base paper was used.
/M 2 , and a double-sided coated paper for printing was obtained in the same manner as in Example 1 except that the coating amount per one side after drying was changed to 21 g/m 2 .

【００４９】実施例３ 実施例１において、塗被条件として、原紙米坪を１０１
ｇ／ｍ2 、乾燥後の片面当たりの塗被量を２８ｇ／ｍ2
に変更した以外は、実施例１と同様にして印刷用両面塗
被紙を得た。Example 3 In Example 1, as a coating condition, a base paper of 100 square meters was used.
g/m 2 , coating amount per one side after drying is 28 g/m 2
A double-sided coated paper for printing was obtained in the same manner as in Example 1 except that the content was changed to.

【００５０】実施例４ 実施例１において、塗料の調製に際し、高Ｔｇラテック
スとして、Ｔｇが４４℃、ゲル含有量が８０％のスチレ
ン−ブタジエン共重合体ラテックス（商品名：Ｐ−３２
５０／住化Ａ＆Ｌ社）を固形分換算で１５部、および低
Ｔｇラテックスとして、Ｔｇが−５℃、ゲル含有量が９
０％のスチレン−ブタジエン共重合体ラテックス（商品
名：ＳＮ−１０１Ｂ／住化Ａ＆Ｌ社）を固形分換算で４
部とそれぞれ変更したこと以外は、実施例１と同様にし
て印刷用両面塗被紙を得た。Example 4 In Example 1, a styrene-butadiene copolymer latex (trade name: P-32) having a Tg of 44° C. and a gel content of 80% was used as a high Tg latex in the preparation of the coating material.
50/Sumika A&L) as 15 parts in terms of solid content and low Tg latex, Tg of -5°C, gel content of 9
4% of 0% styrene-butadiene copolymer latex (trade name: SN-101B/Sumika A&L) in terms of solid content
A double-sided coated paper for printing was obtained in the same manner as in Example 1 except that each part was changed.

【００５１】実施例５ 実施例１において、塗料の調製に際し、高Ｔｇラテック
スとして、Ｔｇが２６℃、ゲル含有量が７０％のスチレ
ン−ブタジエン共重合体ラテックス（商品名：Ｐ−３２
５５／住化Ａ＆Ｌ社）を固形分換算で１５部に変更し、
かつ低Ｔｇラテックスを添加しなかったこと以外は、実
施例１と同様にして印刷用両面塗被紙を得た。Example 5 In Example 1, a styrene-butadiene copolymer latex (trade name: P-32) having a Tg of 26° C. and a gel content of 70% was used as a high Tg latex in the preparation of the coating material.
55/Sumika A&L) to 15 parts in terms of solid content,
A double-sided coated paper for printing was obtained in the same manner as in Example 1 except that the low Tg latex was not added.

【００５２】実施例６ 実施例１において、塗料の調製に際し、顔料として、エ
クリプス７７００（カオリン）の代わりに、平均粒子径
が０．７μｍ、１μｍ以下の粒子の含有率が７４％、か
つ３μｍ以上の粒子の含有率が５％であるカオリン（商
品名：カオグロス９０／シール社) を５０部、軽質炭酸
カルシウム（商品名：ＴＰ−１２３ＣＳ／奥多摩工業
社）の添加量を３７部、さらに重質炭酸カルシウム（商
品名：ＦＭＴ−９０／ファイマテック社）１０部、有機
顔料（商品名：ローペイクＨＰ−９１／ローム＆ハース
社）３部に変更したこと以外は、実施例１と同様にして
印刷用両面塗被紙を得た。Example 6 In Example 1, in the preparation of the coating material, as the pigment, instead of Eclipse 7700 (kaolin), the content of particles having an average particle size of 0.7 μm, 1 μm or less and 74% and 3 μm or more was used. Of kaolin (product name: Kaogros 90/Seal) having a particle content of 5%, light calcium carbonate (product name: TP-123CS/Okutama Industrial Co., Ltd.) added at 37 parts, and heavier Printing was carried out in the same manner as in Example 1 except that 10 parts of calcium carbonate (trade name: FMT-90/Pharmatech) and 3 parts of organic pigment (trade name: Ropaik HP-91/Rohm & Haas) were changed. A double-sided coated paper was obtained.

【００５３】実施例７ 実施例６において、塗料の調製に際し、顔料として、カ
オグロス９０（カオリン）の代わりに、平均粒子径が
０．６μｍ、１μｍ以下の粒子の含有率が６５％、かつ
３μｍ以上の粒子の含有率が５％であるカオリン（商品
名：コントラスト２０５／エンゲルハード社）に変更し
たこと以外は、実施例６と同様にして印刷用両面塗被紙
を得た。Example 7 In Example 6, in the preparation of the coating composition, as a pigment, the content of particles having an average particle size of 0.6 μm, 1 μm or less and 65% and 3 μm or more was used, instead of kaogloss 90 (kaolin). A double-sided coated paper for printing was obtained in the same manner as in Example 6 except that kaolin (trade name: Contrast 205/Engelhard) having a particle content of 5% was changed.

【００５４】実施例８ 実施例６において、塗料の調製に際し、高Ｔｇラテック
スとして、Ｔｇが４４℃、ゲル含有量が８０％のスチレ
ン−ブタジエン共重合体ラテックス（商品名：Ｐ−３２
５０／住化Ａ＆Ｌ社）を固形分換算で１０部、および低
Ｔｇラテックスとして、Ｔｇが−２８℃、ゲル含有量が
８６％のスチレン−ブタジエン共重合体ラテックス（商
品名：Ｓ−２５６４Ａ−２／日本合成ゴム社）を固形分
換算で５部となるように、それぞれ変更したこと以外
は、実施例６と同様にして印刷用両面塗被紙を得た。Example 8 In Example 6, a styrene-butadiene copolymer latex having a Tg of 44° C. and a gel content of 80% (trade name: P-32) was used as a high Tg latex in the preparation of the coating material.
50/Sumika A&L Co., Ltd. as 10 parts in terms of solid content, and a low Tg latex, Tg is −28° C., gel content is 86%, styrene-butadiene copolymer latex (trade name: S-2564A-2). A double-sided coated paper for printing was obtained in the same manner as in Example 6 except that the amount of each component was changed to 5 parts in terms of solid content.

【００５５】実施例９ 実施例１において、キャレンダー仕上げに際し、金属ロ
ールの表面温度を１２０℃に変更したこと以外は、実施
例１と同様にして印刷用両面塗被紙を得た。Example 9 A double-sided coated paper for printing was obtained in the same manner as in Example 1 except that the surface temperature of the metal roll was changed to 120° C. in calendering.

【００５６】実施例１０ 実施例１において、塗料の調製に際し、顔料として、軽
質炭酸カルシウム（ＴＰ−１２３ＣＳ／前記）の代わり
に、平均粒子径が０．３μｍのカルサイト系立方体状の
軽質炭酸カルシウム (商品名：ブリリアントＳ−１５／
白石工業社）に変更したこと以外は、実施例１と同様に
して印刷用両面塗被紙を得た。Example 10 In Example 1, in the preparation of the coating material, as the pigment, instead of the light calcium carbonate (TP-123CS/the above), a calcite-based cubic light calcium carbonate having an average particle diameter of 0.3 μm was used. (Product name: Brilliant S-15/
A double-sided coated paper for printing was obtained in the same manner as in Example 1 except that Shiraishi Kogyo Co., Ltd. was used.

【００５７】実施例１１ 〔下塗り用塗料の調製〕顔料として、カオリン（商品
名：ＨＴ／エンゲルハード社）２０部と重質炭酸カルシ
ウム（商品名：ＦＭＴ−９０／ファイマテック社）８０
部を使用し、分散剤として顔料に対してポリアクリル酸
ソーダを０．２部添加し、コーレス分散機を用いて固形
分濃度が７２％の顔料スラリーを調製した。このスラリ
ーに共重合体ラテックスとしてＴｇが−５℃、ゲル含有
量が９０％のスチレン−ブタジエン共重合体ラテックス
（商品名：ＳＮ−１０１Ｂ／住化Ａ＆Ｌ社）を固形分換
算で６部、予め糊化した酸化澱粉（商品名：エースＣ／
王子コーンスターチ社）を固形分換算で８部を添加し、
更に水を加えて固形分濃度６５％の塗料を調製した。Example 11 [Preparation of paint for undercoating] As a pigment, 20 parts of kaolin (trade name: HT/Engelhard) and ground calcium carbonate (trade name: FMT-90/Pharmatech) 80
Part was used, 0.2 part of sodium polyacrylate was added to the pigment as a dispersant, and a pigment slurry having a solid content concentration of 72% was prepared using a Choles disperser. Styrene-butadiene copolymer latex having a Tg of -5°C and a gel content of 90% (trade name: SN-101B/Sumika A&L Co.) was added to the slurry as a copolymer latex in 6 parts in terms of solid content in advance. Gelatinized oxidized starch (trade name: Ace C/
Oji Corn Starch Co., Ltd.) and added 8 parts in terms of solid content,
Further, water was added to prepare a paint having a solid content concentration of 65%.

【００５８】〔下塗り塗料の塗工〕上記の下塗り塗料を
実施例１で用いたものと同じ原紙上に、乾燥後の塗被量
が片面当たり１０ｇ／ｍ2 となるように両面に塗被した
以外は、実施例１の塗工と同様にして下塗り原紙を得
た。[Coating of Undercoat Paint] The same undercoat paint as used in Example 1 was coated on both surfaces so that the coating amount after drying was 10 g/m 2 per side. An undercoat base paper was obtained in the same manner as in the coating of Example 1 except for the above.

【００５９】〔上塗り塗料の塗工〕実施例１で用いた塗
料を上塗り塗料として使用し、上記の下塗り原紙上に、
乾燥後の塗被量が片面当たり１５ｇ／ｍ2 となるように
したこと以外は、実施例１の塗工と同様にして上塗り塗
被層を設けた。[Coating of Topcoat Paint] Using the paint used in Example 1 as a topcoat paint, the above basecoat base paper was coated with
An overcoat coating layer was provided in the same manner as the coating of Example 1, except that the coating amount after drying was 15 g/m 2 per side.

【００６０】〔ソフトキャレンダー仕上げ〕上記の両面
塗被紙を実施例１と同様にキャレンダー仕上げを行い、
印刷用両面塗被紙を得た。[Soft Calender Finishing] The above double-sided coated paper was calendered in the same manner as in Example 1,
A double-sided coated paper for printing was obtained.

【００６１】比較例１ 実施例１において、塗料の調製に際し、顔料として、エ
クリプス７７００（カオリン）の代わりに、平均粒子径
が０．３μｍ、１μｍ以下の粒子の含有率が７６％、か
つ３μｍ以上の粒子の含有率が８％であるカオリン（商
品名：ＨＴ／エンゲルハード社）に変更したこと以外
は、実施例１と同様にして印刷用両面塗被紙を得た。Comparative Example 1 In the preparation of the coating composition of Example 1, instead of Eclipse 7700 (kaolin) as the pigment, the content of particles having an average particle size of 0.3 μm, 1 μm or less and 76% and 3 μm or more was used. A double-sided coated paper for printing was obtained in the same manner as in Example 1 except that kaolin (trade name: HT/Engelhard) having a particle content of 8% was changed.

【００６２】比較例２ 実施例１において、塗料の調製に際し、顔料として、エ
クリプス７７００（カオリン）の代わりに、平均粒子径
が０．３μｍ、１μｍ以下の粒子の含有率が８６％、か
つ３μｍ以上の粒子の含有率が３％であるカオリン（商
品名：ミラグロス／エンゲルハード社）に変更したこと
以外は、実施例１と同様にして印刷用両面塗被紙を得
た。Comparative Example 2 In the preparation of the coating composition of Example 1, instead of Eclipse 7700 (kaolin) as the pigment, the content of particles having an average particle diameter of 0.3 μm and 1 μm or less was 86% and 3 μm or more. A double-sided coated paper for printing was obtained in the same manner as in Example 1 except that kaolin (trade name: Milagros/Engelhard) having a particle content of 3% was changed.

【００６３】比較例３ 実施例１において、塗料の調製に際し、顔料として、エ
クリプス７７００（カオリン）の代わりに、平均粒子径
が０．２μｍ、１μｍ以下の粒子の量が９８％、かつ３
μｍ以上の粒子の含有率が０％であるカオリン（商品
名：アマゾン８８／ＣＡＤＡＭ社）に変更したこと以外
は、実施例１と同様にして印刷用両面塗被紙を得た。Comparative Example 3 In the preparation of the coating composition of Example 1, instead of Eclipse 7700 (kaolin) as the pigment, the amount of particles having an average particle diameter of 0.2 μm and 1 μm or less was 98%, and 3
A double-sided coated paper for printing was obtained in the same manner as in Example 1 except that kaolin (trade name: Amazon 88/CADAM) having a content of particles of μm or more was 0%.

【００６４】比較例４ 実施例１において、塗料の調製に際し、顔料として、エ
クリプス７７００（カオリン）の代わりに、平均粒子径
が０．６μｍ、１μｍ以下の粒子の量が６５％、かつ３
μｍ以上の粒子の含有率が１２％であるカオリン（商品
名：ニュクレイ／エンゲルハード社）に変更したこと以
外は、実施例１と同様にして印刷用両面塗被紙を得た。Comparative Example 4 In the preparation of the coating material in Example 1, instead of Eclipse 7700 (kaolin) as the pigment, the amount of particles having an average particle size of 0.6 μm and 1 μm or less was 65%, and 3%.
A double-sided coated paper for printing was obtained in the same manner as in Example 1 except that kaolin (trade name: Nuclei/Engelhard Co., Ltd.) having a content of particles of μm or more of 12% was used.

【００６５】比較例５ 実施例６において、塗料の調製に際し、顔料として、カ
オグロス９０（カオリン）の代わりに、平均粒子径が
２．３μｍ、１μｍ以下の粒子の量が３０％、かつ３μ
ｍ以上の粒子の比率が４０％であるカオリン（商品名：
ＮＤ−２５１０／ＥＣＣ社）に変更したこと以外は、実
施例６と同様にして印刷用両面塗被紙を得た。Comparative Example 5 In Example 6, in the preparation of the coating material, the amount of particles having an average particle size of 2.3 μm, 1 μm or less and 30% and 3 μm was used as a pigment, instead of kaogloss 90 (kaolin).
Kaolin with a ratio of particles of m or more of 40% (trade name:
A double-sided coated paper for printing was obtained in the same manner as in Example 6 except that the composition was changed to ND-2510/ECC.

【００６６】比較例６ 実施例５において、塗料の調製に際し、接着剤として、
Ｐ−３２５５（高Ｔｇラテックス）の代わりに、Ｔｇが
１５℃、ゲル含有量が６０％のスチレン−ブタジエン共
重合体ラテックス（商品名：ＳＮ−３３７／住化Ａ＆Ｌ
社）を固形分換算で１５部添加とした（変更）以外は、
実施例５と同様にして印刷用両面塗被紙を得た。Comparative Example 6 In Example 5, an adhesive was used in the preparation of the paint.
Instead of P-3255 (high Tg latex), styrene-butadiene copolymer latex with Tg of 15°C and gel content of 60% (trade name: SN-337/Sumika A&L)
(Company) was added (changed) to 15 parts in terms of solid content, except
A double-sided coated paper for printing was obtained in the same manner as in Example 5.

【００６７】比較例７ 実施例１において、塗料の調製に際し、カオリン（エク
リプス７７００／前記）の配合率を３５部、軽質炭酸カ
ルシウム（ＴＰ−１２３ＣＳ／前記）の配合率を６３部
に変更したこと以外は、実施例１と同様にして印刷用両
面塗被紙を得た。Comparative Example 7 In Example 1, the composition of kaolin (Eclipse 7700/above) was changed to 35 parts and the content of light calcium carbonate (TP-123CS/above) was changed to 63 parts in the preparation of the coating composition. A double-sided coated paper for printing was obtained in the same manner as in Example 1 except for the above.

【００６８】比較例８ 実施例１において、キャレンダー仕上げに際し、塗被紙
の表、裏のそれぞれの面が３回ずつ金属ロールに接触す
るように通紙して仕上げたこと以外は、実施例１と同様
にして印刷用両面塗被紙を得た。Comparative Example 8 Example 8 was repeated except that the calendering was carried out in the same manner as in Example 1 except that the front and back surfaces of the coated paper were passed through the metal roll three times each. A double-sided coated paper for printing was obtained in the same manner as in 1.

【００６９】比較例９ 実施例４の塗工において、熱風の温度を６０℃とし、乾
燥中に塗被層の温度が高ＴｇラテックスのＴｇを越えな
いないように乾燥せしめたこと以外は、実施例４と同様
にして印刷用両面塗被紙を得た。Comparative Example 9 The procedure of Example 4 was repeated, except that the temperature of the hot air was 60° C. and the coating layer was dried so that the temperature of the coating layer did not exceed the Tg of the high Tg latex during drying. A double-sided coated paper for printing was obtained in the same manner as in Example 4.

【００７０】比較例１０ 比較例６において、原紙米坪を１０１ｇ／ｍ2 、乾燥後
の片面当たりの塗被量を２８ｇ／ｍ2 に変更したこと以
外は、比較例６と同様にして印刷用両面塗被紙を得た。[0070] In Comparative Example 10 Comparative Example 6, 101g / m 2 base paper rice basis, except that the coated amount per one surface after drying was changed to 28 g / m 2, for printing in the same manner as in Comparative Example 6 A double-sided coated paper was obtained.

【００７１】比較例１１ 比較例６において、原紙米坪を１２８ｇ／ｍ2 、乾燥後
の片面当たりの塗被量を２８ｇ／ｍ2 に変更したこと以
外は、比較例６と同様にして印刷用両面塗被紙を得た。Comparative Example 11 For Comparative Example 6, printing was carried out in the same manner as in Comparative Example 6 except that the basis weight of the base paper was changed to 128 g/m 2 and the coating amount per one side after drying was changed to 28 g/m 2 . A double-sided coated paper was obtained.

【００７２】比較例１２ 実施例９において、下塗り塗料の塗工に際し、乾燥後の
片面当たりの塗被量を１５ｇ／ｍ2 とし、さらに上塗り
塗料の塗工において、片面当たりの乾燥後の塗被量を１
０ｇ／ｍ2 としたこと以外は、実施例９と同様にして印
刷用両面塗被紙を得た。Comparative Example 12 In Example 9, the coating amount of one side after drying was 15 g/m 2 when applying the undercoat paint, and the coating amount after drying was applied per side when applying the topcoat paint. Quantity 1
A double-sided coated paper for printing was obtained in the same manner as in Example 9 except that the amount was 0 g/m 2 .

【００７３】上記の実施例および比較例で得られた塗被
紙の品質を測定し、その結果を表１に示した。なお、顔
料の粒子径、共重合体ラテックスのＴｇおよび塗被紙の
品質は以下の方法、評価基準に基づいて行った。The quality of the coated papers obtained in the above Examples and Comparative Examples was measured, and the results are shown in Table 1. The particle size of the pigment, the Tg of the copolymer latex, and the quality of the coated paper were determined based on the following methods and evaluation criteria.

【００７４】（顔料の粒度分布）沈降法（測定器：ＳＥ
ＤＩＧＲＡＰＨ５０００／島津製作所）により、微粒子
分からの累積重量が５０％となるときの粒子径を平均粒
子径とし、１μｍ以下の粒子の含有率は微粒子分から１
μｍまでの累積重量％であり、３μｍ以上の粒子の含有
率は微粒子分から３μｍまでの累積重量％を１００から
差引いた値である。(Particle size distribution of pigment) Sedimentation method (measuring instrument: SE
DIGRAPH 5000/Shimadzu Corporation), the average particle size is defined as the particle size when the cumulative weight from the fine particles is 50%, and the content of particles of 1 μm or less is 1
The cumulative weight% up to μm is the content of particles of 3 μm or more is the value obtained by subtracting the cumulative weight% up to 3 μm from the fine particle content from 100.

【００７５】（Ｔｇ：ラテックスのガラス転移温度）共
重合体ラテックスを室温で乾燥してフィルムを作成し、
示差熱走査熱量計（ＤＳＣ−８２３０Ｄ／リガク）を用
い昇温速度１０℃／分で測定した。(Tg: Latex glass transition temperature) The copolymer latex is dried at room temperature to form a film,
It measured at the temperature rising rate of 10 degree-C/min using the differential thermal scanning calorimeter (DSC-8230D/Rigaku).

【００７６】（ラテックスのゲル含有量）水酸化ナトリ
ウム溶液で共重合体ラテックスのｐＨを８．０に調整
し、テフロンシートをひいたガラス板上で厚み１ｍｍの
片枠内にラテックスを入れ、一昼夜乾燥し、さらに一昼
夜減圧乾燥してラテックスフィルムを得た。得られた共
重合体ラテックスフィルム約１．０ｇを正確に秤量後４
００ｍｌのトルエンに４８時間放置溶解し、重量既知の
３００メッシュの金網で濾過後、金網上のトルエン不溶
分を乾燥、秤量して下記式によりゲル含有量を算出し
た。 ゲル含有量％＝（金網上不溶分重量ｇ）／（トルエンに
入れる前の共重合体ラテックスフィルムの重量ｇ）(Gel content of latex) The pH of the copolymer latex was adjusted to 8.0 with a sodium hydroxide solution, and the latex was put in a one-mm-thick frame on a glass plate with a Teflon sheet, and allowed to stand overnight. It was dried and further dried under reduced pressure for one day to obtain a latex film. After accurately weighing about 1.0 g of the obtained copolymer latex film, 4
It was left to dissolve in 00 ml of toluene for 48 hours, filtered through a 300-mesh wire mesh of known weight, the toluene-insoluble portion on the wire mesh was dried and weighed, and the gel content was calculated by the following formula. Gel content%=(weight of insoluble matter on wire mesh)/(weight of copolymer latex film before adding to toluene)

【００７７】（密度）ＪＩＳ Ｐ８１１８に準拠して測
定した。(Density) The density was measured according to JIS P8118.

【００７８】（光沢度）ＪＩＳ Ｐ８１４２に準拠して
測定した。数値が大きいほど光沢が高い。(Glossiness) The glossiness was measured according to JIS P8142. The higher the value, the higher the gloss.

【００７９】（平滑度）ＪＡＰＡＮ ＴＡＰＰＩ紙パル
プ試験法Ｎo.５Ａに準拠して測定した。数値が小さいほ
ど平滑性が高い。(Smoothness) The smoothness was measured according to Japan TAPPI Paper Pulp Test Method No. 5A. The smaller the value, the higher the smoothness.

【００８０】（塗被層の接着強度）ＲＩ印刷適性試験機
（明製作所）を用い、タックバリュー１２のインキを使
用して塗被層の一部剥離（コートピック）が発生するま
で繰り返し印刷し、それぞれの繰り返し印刷回数から以
下の基準で評価した。 ４： 接着力が強く、印刷用塗被紙として問題がないレ
ベル ３： 接着力が、オフセット枚葉印刷用の塗被紙の標準
レベル ２： 接着力がやや弱いが、オフセット枚葉印刷用塗被
紙として、インキのタックを下げる等、印刷条件を調整
することで印刷可能なレベル １： 接着力が弱く、オフセット枚葉印刷用塗被紙とし
ては使用できないレベル(Adhesive Strength of Coated Layer) Using an RI printability tester (Myo Seisakusho), ink having a tack value of 12 was repeatedly printed until partial peeling of the coated layer (co-topic) occurred. The number of times of repeated printing was evaluated according to the following criteria. 4: Strong adhesion and no problem as a coated paper for printing 3: Adhesive strength is a standard level for coated paper for offset sheet-fed printing 2: Adhesive strength is a little weak, but for offset sheet-fed printing Printable level by adjusting the printing conditions such as lowering the tack of the ink as the paper 1: The level that the adhesive strength is weak and cannot be used as the coated paper for offset sheet-fed printing

【００８１】（インキセット性）ＲＩ印刷適性試験機
（明製作所）を用い、オフセット枚葉印刷用墨インキ
０．５ｍｌを展色して印刷し、印刷３０秒後に上質紙を
印刷面に一定圧力で圧着して、上質紙への裏移り（セッ
トオフ）状況を以下の基準で評価した。 ４： インキセットが極めて速く、オフセット枚葉印刷
で１００００枚／時間程度の印刷速度でも、スプレーパ
ウダーを多くする必要がなく、裏移りの問題がないレベ
ル ３： インキセット速度は、オフセット枚葉印刷用塗被
紙の標準レベル ２： インキセットがやや遅いがが、オフセット枚葉印
刷用塗被紙として、スプレーパウダーを多くする等、印
刷条件を調整することで印刷可能なレベル １： インキセットが遅く、オフセット枚葉印刷用塗被
紙としては使用できないレベル(Ink setting property) Using an RI printing aptitude tester (Myo Seisakusho), 0.5 ml of ink for offset sheet-fed printing was spread and printed, and after 30 seconds of printing, a high-quality paper was pressed at a constant pressure on the printing surface. Then, the state of set-off on fine paper was evaluated by the following criteria. 4: The ink setting is extremely fast, and even at a printing speed of about 10000 sheets/hour in offset sheet-fed printing, there is no need to increase the amount of spray powder, and there is no problem of set-off. Level 3: Ink-set speed is offset sheet-fed printing. Standard level of coated paper for printing 2: The ink set is a little slow, but as offset coated sheet printing, it is possible to print by adjusting printing conditions such as increasing spray powder. Slow and unusable as a coated paper for offset sheet-fed printing

【００８２】（吸水着肉性）ＲＩ印刷適性試験機（明製
作所）を用い、まず塗被紙表面に一定量の水を付け、直
ちにオフセット枚葉印刷用墨インキ０．５ｍｌを展色し
て印刷し、インキの着肉性を以下の基準で評価した。 ４： 吸水着肉性が極めて良好で、オフセット枚葉印刷
で湿し水が増えても印刷可能なレベル ３： 吸水着肉性は、オフセット枚葉印刷用塗被紙の標
準レベル ２： 吸水着肉性がやや劣るが、オフセット枚葉印刷用
塗被紙として、湿し水を少なくする等、印刷条件を調整
することで印刷可能なレベル １： 吸水着肉性が劣り、オフセット枚葉印刷用塗被紙
としては使用できないレベル(Meat Absorption Swimsuit) Using a RI printability tester (Ming Seisakusho), first, a certain amount of water was applied to the surface of the coated paper, and 0.5 ml of the ink for offset sheet-fed printing was immediately developed. After printing, the ink receptivity was evaluated according to the following criteria. 4: Absorbent swimsuit is extremely good in meat level and can be printed even if the dampening water is increased in offset sheet-fed printing. 3: Absorbent swimsuit is a standard level for offset sheet-fed coated paper. Although it is slightly inferior in physical properties, it can be printed by adjusting printing conditions such as reducing dampening water as a coated paper for offset sheet-fed printing. Level that cannot be used as coated paper

【００８３】（剛度）ＪＩＳ Ｐ８１４３のＡ法に準拠
して突出し長さを縦目、横目で測定し、その平均値を突
出し長さＬ（ｍｍ）で示した。(Stiffness) According to JIS P8143, Method A, the protruding length was measured for the vertical and horizontal stitches, and the average value was shown as the protruding length L (mm).

【００８４】（本の硬さ…高級感，重量感）実施例およ
び比較例で得られた両面印刷用塗被紙を用いて３０頁の
ステッチ止めカタログを作成し、カタログの背中部分を
指で掴み、持ち上げたときの硬さ感覚（本の硬さ）を、
実施例塗被紙で作成したカタログについて以下の基準で
評価した。 Ａ： 高Ｔｇラテックスを用いていない比較例塗被紙の
１つ上の製品米坪で作成したカタログ、例えば実施例塗
被紙１０５ｇ／ｍ2 を用いたカタログに対しては比較例
塗被紙１２８ｇ／ｍ2 （比較例６を評価対照品：＊）を
用いたカタログと、また、実施例塗被紙１２８ｇ／ｍ2
を用いたカタログに対しては比較例塗被紙１５７ｇ／ｍ
2 （比較例１０を評価対照品：＊）を用いたカタログ
と、さらに実施例塗被紙１５７ｇ／ｍ2 を用いたカタロ
グに対しては比較例塗被紙１８４ｇ／ｍ2 （比較例１１
を評価対照品：＊）を用いたカタログと、即ち、米坪で
概略２５ｇ／ｍ2 異なる（より大きい米坪）塗被紙製品
で仕上げたカタログと同レベルの硬さ感覚を示し、高Ｔ
ｇラテックスを用いていない比較例同米坪塗被紙を用い
て仕上げたカタログより明らかに高級感や重量感を呈す
る。 Ｂ： 高Ｔｇラテックスを用いていない比較例塗被紙の
１つ上の製品米坪で作成したカタログ、例えば実施例塗
被紙１０５ｇ／ｍ2 を用いたカタログに対しては比較例
塗被紙１２８ｇ／ｍ2 を用いたカタログと、即ち、米坪
で概略２５ｇ／ｍ 2 異なる（より大きい米坪）塗被紙製
品で仕上げたカタログと同レベルの硬さ感覚までは達し
ていないが、高Ｔｇラテックスを用いていない比較例同
米坪塗被紙を用いて仕上げたカタログとは硬さに明瞭な
違いが感じられる。(Hardness of book: high-class feeling, heavy feeling) Examples and
And the coated paper for double-sided printing obtained in Comparative Example
Create a stitched catalog and attach the back of the catalog
The feeling of hardness (the hardness of the book) when grasped with your fingers and lifted,
Example For catalogs made of coated paper
evaluated. A: Comparative coated paper not using high Tg latex
A catalog created with the product one square meter above, such as example coating
Paper 105g/m2Comparative example for catalogs using
Coated paper 128g/m2(Comparative Example 6 is an evaluation reference product: *)
Catalog used and also Example coated paper 128 g/m2
Comparative example coated paper 157g/m
2Catalog using (Comparative Example 10 is an evaluation reference product: *)
And further, the coated paper of Example 157 g/m2Catalo using
Comparative example coated paper 184 g/m2(Comparative Example 11
Is a catalog using the evaluation reference product: *), that is,
25 g/m2Different (larger tsubo) coated paper products
It shows the same level of hardness as the catalog finished with
g Comparative example not using latex Latex coated paper
The finished catalog clearly gives a sense of luxury and weight.
It B: Comparative example of coated paper not using high Tg latex
A catalog created with the product one square meter above, such as example coating
Paper 105g/m2Comparative example for catalogs using
Coated paper 128g/m2With a catalog, that is,
About 25 g/m 2Made of different (larger tsubo) coated paper
It reaches the same level of hardness as the catalog finished with products.
No, but the same as the comparative example which does not use high Tg latex
It is clear in terms of hardness compared to the catalog finished with Yonetsubo coated paper
You can feel the difference.

【００８５】（キャレンダー操業性）各実施例、比較例
において、両面塗被紙を１０，０００ｍキャレンダー仕
上げした後の、金属ロール表面の曇り具合や、塗料粕付
着程度により、以下の基準で評価した。 ４： 金属ロールの曇りが全くない ３： 金属ロールがやや曇っているが、塗料粕の付着は
ない ２： 塗料粕の付着がわずかに認められる １： 塗料粕が多く付着している(Calendar operability) In each of the examples and comparative examples, the following criteria were used according to the degree of fog on the surface of the metal roll and the degree of adhesion of paint residue after calendering double-sided coated paper for 10,000 m. evaluated. 4: No fogging of the metal roll 3: The metal roll is slightly foggy, but there is no adhesion of paint dregs 2: Adhesion of paint dregs is slightly observed 1: A lot of paint dregs are adhered

【００８６】[0086]

【表１】 [Table 1]

【００８７】[0087]

【発明の効果】表１の結果から明らかなように、本発明
に係る両面塗被紙は光沢、平滑性が高く、良好な印刷適
性を有し、かつ紙腰（剛度）が高く、本文用紙等に用い
ると高級感を与える印刷用両面塗被紙であった。As is clear from the results shown in Table 1, the double-sided coated paper according to the present invention has high gloss and smoothness, has good printability, and has high stiffness (stiffness) and text paper. It was a double-sided coated paper for printing, which gave a high-grade feeling when used for other purposes.

【図面の簡単な説明】[Brief description of drawings]

【図１】図１は米坪と剛度の関係について、従来市販品
と本発明品とを比較したものである。FIG. 1 is a comparison between a conventional commercial product and a product of the present invention in terms of a relationship between a rice pylon and rigidity.

【図２】図２は光沢と剛度の関係について、従来市販品
と本発明品とを比較したものである。FIG. 2 is a comparison between a conventional commercial product and the product of the present invention regarding the relationship between gloss and rigidity.

【符号の説明】[Explanation of symbols]

● ：本発明に係る製品 ○ ：従来市販品 ●: Product according to the present invention ○: Conventional commercial product

───────────────────────────────────────────────────── 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 Ｄ２１Ｈ 5/00 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display part D21H 5/00

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】原紙上に顔料および接着剤を主成分とする
塗被組成物を両面に塗被、乾燥した後、１００℃以上の
高温キャレンダーに通紙して仕上げる印刷用両面塗被紙
において、ＪＩＳ Ｐ８１４３のＡ法に準拠して測定し
たクラーク突き出し長さの縦目、横目の平均値Ｌが下記
（１）式を満足する印刷用両面塗被紙であって、 Ｌ ＞ １．２８Ｘ＋４５ （１） 〔ここに、Ｌ＝塗被紙の縦目、および横目におけるクラ
ーク突き出し長さの平均値（単位：ｍｍ）、Ｘ＝製品米
坪（ｇ／ｍ2 ）である〕該塗被紙の両面最外側の塗被層
中に、顔料として平均粒子径が０．５〜１．０μｍ、１
μｍ以下の粒子の含まれる比率が５０〜８０重量％、か
つ３μｍ以上の粒子の含まれる比率が５％以下であるカ
オリンを全顔料に対して４０〜９０重量％含有せしめ、
さらに接着剤としてガラス転移温度が２５〜５０℃であ
る共重合体ラテックス（ａ）を全顔料に対して固形分対
比で５〜３０重量％含有せしめ、かつ片面当たりの該塗
被層の乾燥重量が１２〜３０ｇ／ｍ2 であることを特徴
とする印刷用両面塗被紙。1. A double-sided coated paper for printing, which is prepared by coating a base paper with a coating composition containing a pigment and an adhesive as main components, drying it, and then passing it through a high temperature calender at 100° C. or higher to finish. In the double-sided coated paper for printing, the average value L of the grain lengths and the widths of the Clark protrusions measured according to JIS P8143 A method satisfies the following formula (1), and L> 1.28X+45 (1) [where L=average value of Clark protrusion length (unit: mm) in the longitudinal and lateral directions of the coated paper, X=product tsubo (g/m 2 )] In the outermost coating layer on both sides of the above, the average particle diameter as a pigment is 0.5 to 1.0 μm, and 1
40 to 90 wt% of kaolin having a proportion of particles of not more than μm of 50 to 80% by weight and a proportion of particles of not less than 3 μm of not more than 5% is contained in all pigments,
Further, a copolymer latex (a) having a glass transition temperature of 25 to 50° C. is contained as an adhesive in an amount of 5 to 30% by weight based on the total solid content of all pigments, and the dry weight of the coated layer per one side. Is 12 to 30 g/m 2 , and the double-sided coated paper for printing is characterized in that 【請求項２】さらに、最外側の塗被層中に、顔料として
平均粒子径が０．１〜０．５μｍのアラゴナイト系の針
状軽質炭酸カルシウムを全顔料に対して１０〜６０重量
％含有せしめてなる請求項１に記載の印刷用両面塗被
紙。2. The outermost coating layer further contains, as a pigment, aragonite-based acicular light calcium carbonate having an average particle size of 0.1 to 0.5 μm in an amount of 10 to 60% by weight based on all pigments. The double-sided coated paper for printing according to claim 1, which is made at most. 【請求項３】さらに、最外側の塗被層中に、接着剤とし
てガラス転移温度が−３０〜５℃である共重合体ラテッ
クス（ｂ）を含有せしめ、ガラス転移温度が２５〜５０
℃である共重合体ラテックス（ａ）、およびガラス転移
温度が−３０〜５℃である共重合体ラテックス（ｂ）の
合計量が、全顔料に対して固形分対比で５〜３０重量％
であり、かつ前記（ａ）の共重合体ラテックス：（ｂ）
の共重合体ラテックスの配合比率が９：１〜５：５であ
る請求項１に記載の印刷用両面塗被紙。3. The outermost coating layer further contains a copolymer latex (b) having a glass transition temperature of −30 to 5° C. as an adhesive and a glass transition temperature of 25 to 50.
The total amount of the copolymer latex (a) having a glass transition temperature of −30° C. and the copolymer latex (b) having a glass transition temperature of −30 to 5° C. is 5 to 30% by weight based on the solid content relative to all pigments.
And the copolymer latex of (a) above: (b)
The double-sided coated paper for printing according to claim 1, wherein the compounding ratio of the copolymer latex is 9:1 to 5:5. 【請求項４】（ａ）の共重合体ラテックスのゲル含有率
が３０〜９０％、かつ（ｂ）の共重合体ラテックスのゲ
ル含有率が５０〜９０％である請求項３に記載の印刷用
両面塗被紙。4. The printing according to claim 3, wherein the gel content of the copolymer latex (a) is 30 to 90%, and the gel content of the copolymer latex (b) is 50 to 90%. Double-sided coated paper for. 【請求項５】仕上げ後の印刷用両面塗被紙のＪＩＳ Ｐ
８１１８に準拠して測定した密度が１．１５〜１．３５
ｇ／ｃｍ3 、塗被紙面（塗被層）のＪＩＳ Ｐ８１４２
に準拠して測定した光沢値が７５％以上、かつＪ．ＴＡ
ＰＰＩ紙パルプ試験方法No. ５Ａ法のスムースターによ
る平滑度が２０ｍｍＨｇ以下である請求項１〜４のいず
れか一項に記載の印刷用両面塗被紙。5. The JIS P of double-sided coated paper for printing after finishing.
The density measured according to 8118 is 1.15 to 1.35.
g/cm 3 , JIS P8142 of coated paper surface (coated layer)
The gloss value measured according to J. TA
The double-sided coated paper for printing according to any one of claims 1 to 4, which has a smoothness of 20 mmHg or less by a smoother of PPI paper pulp test method No. 5A method.
JP16724897A 1996-06-27 1997-06-24 Double-side coated paper for printing Pending JPH1072796A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16724897A JPH1072796A (en) 1996-06-27 1997-06-24 Double-side coated paper for printing

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP8-167745 1996-06-27
JP16774596 1996-06-27
JP16724897A JPH1072796A (en) 1996-06-27 1997-06-24 Double-side coated paper for printing

Publications (1)

Publication Number Publication Date
JPH1072796A true JPH1072796A (en) 1998-03-17

Family

ID=26491351

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16724897A Pending JPH1072796A (en) 1996-06-27 1997-06-24 Double-side coated paper for printing

Country Status (1)

Country Link
JP (1) JPH1072796A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001214395A (en) * 2000-01-31 2001-08-07 Nippon Paper Industries Co Ltd Coated paper for printing
JP2002317397A (en) * 2001-04-23 2002-10-31 Mitsubishi Paper Mills Ltd Coated paper for offset printing using environment- friendly ink and deinkable printed matter
JP2006501382A (en) * 2002-10-01 2006-01-12 エスエーピーピーアイ ネザーランズ サーヴィシーズ ビー．ヴイ Coated printing sheet and method for producing the same
JP2006188800A (en) * 2005-01-07 2006-07-20 Oji Paper Co Ltd Coated paper
JP2007520642A (en) * 2003-06-17 2007-07-26 ニューページ コーポレーション Smooth substrate made of nonstandard fibers
JP2007524006A (en) * 2003-06-17 2007-08-23 ニューページ コーポレーション Support base material for photographic base material and method for producing coated paper
JP2010523753A (en) * 2007-04-05 2010-07-15 ユーキ・ユトケミスカ・インスティテュテット・アクチボラゲット Use of aqueous dispersions, coatings and aqueous dispersions
JP2013501157A (en) * 2009-07-29 2013-01-10 ビー・エイ・エス・エフ、コーポレーション A new glossing system for paper and paperboard coatings
JP2015057316A (en) * 2013-08-13 2015-03-26 王子ホールディングス株式会社 Coated paper for inkjet printing
EP2376708B1 (en) 2009-02-10 2016-07-13 MeadWestvaco Corporation Low density paper and paperboard with two-sided coating

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001214395A (en) * 2000-01-31 2001-08-07 Nippon Paper Industries Co Ltd Coated paper for printing
JP2002317397A (en) * 2001-04-23 2002-10-31 Mitsubishi Paper Mills Ltd Coated paper for offset printing using environment- friendly ink and deinkable printed matter
JP2006501382A (en) * 2002-10-01 2006-01-12 エスエーピーピーアイ ネザーランズ サーヴィシーズ ビー．ヴイ Coated printing sheet and method for producing the same
JP2007520642A (en) * 2003-06-17 2007-07-26 ニューページ コーポレーション Smooth substrate made of nonstandard fibers
JP2007524006A (en) * 2003-06-17 2007-08-23 ニューページ コーポレーション Support base material for photographic base material and method for producing coated paper
JP2006188800A (en) * 2005-01-07 2006-07-20 Oji Paper Co Ltd Coated paper
JP2010523753A (en) * 2007-04-05 2010-07-15 ユーキ・ユトケミスカ・インスティテュテット・アクチボラゲット Use of aqueous dispersions, coatings and aqueous dispersions
EP2376708B1 (en) 2009-02-10 2016-07-13 MeadWestvaco Corporation Low density paper and paperboard with two-sided coating
US10619306B2 (en) 2009-02-10 2020-04-14 Westrock Mwv, Llc Low density paper and paperboard with two-sided coating
JP2013501157A (en) * 2009-07-29 2013-01-10 ビー・エイ・エス・エフ、コーポレーション A new glossing system for paper and paperboard coatings
JP2015057316A (en) * 2013-08-13 2015-03-26 王子ホールディングス株式会社 Coated paper for inkjet printing

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