JP2007239130A - Clear-coated printing paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clear-coated printing paper showing a high yield of a filler on papermaking, having less trouble such as between layer peeling or the formation of paper powder in offset printing, having a high opacity, showing less strike through and excellent in printing quality. <P>SOLUTION: This clear-coated printing paper having 0.3 to 0.9 g/cm<SP>3</SP>density is obtained by using a stock paper for the clear-coated printing paper obtained by using calcium carbonate treated with a cationic polymeric compound containing a homopolymer of diallyldimethylammonium chloride or a copolymer or the diallyldimethylammonium chloride with (meth)acrylamide as a component, as the filler, and containing 3 to 40 solid portion wt.% as ash in paper and by coating with a paper surface strength-increasing agent such as hydroxyethylated starch, etc. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、抄造時の填料歩留まりが高く、かつオフセット印刷機での印刷において紙粉や層間剥離のトラブルがなく、印刷走行性に優れ、さらに裏抜けが少なく印面品質に優れるクリア塗工印刷用紙に関する。   The present invention is a clear coated printing paper that has a high filler yield during papermaking, no trouble with paper dust and delamination in printing on an offset printing machine, excellent printing running properties, and excellent print quality with little show-through. About.

オフセット印刷機で使用されるクリア塗工印刷用紙は、高填料化、古紙パルプ高配合化に加え、抄紙機の高速化と両面脱水化等が重なり、抄造時の填料歩留まりは極めて低い状況にある。一方、品質面では、クリア塗工印刷用紙はいうまでもなく、オフセット印刷機での使用に耐えうることが最重要品質であり、紙粉トラブルに関係する表面強度や層間剥離に関係する層間強度に対する要求は極めて厳しい。最近は、これらの走行性に関係する品質に加えて、画像が反対面から透けて見える現象、いわゆる裏抜けについては年々要求レベルが高くなってきている。   Clear coated printing paper used in offset printing machines has a very low filler yield at the time of papermaking due to the high speed of paper machines and double-sided dewatering in addition to high fillers and high waste paper pulp blending. . On the other hand, in terms of quality, it is most important to be able to withstand use with offset printing machines, not to mention clear coated printing paper, and surface strength related to paper dust trouble and interlayer strength related to delamination The demand for is extremely severe. Recently, in addition to the quality related to the running performance, a requirement level for a phenomenon in which an image can be seen through from the opposite side, that is, a so-called back-through, has been increasing year by year.

クリア塗工印刷用紙の印刷時裏抜けを少なくするためには、紙の不透明度を上げることが最も効果的であることが知られている。紙の不透明度を上げる方法としては、比散乱係数が高く不透明度の上昇効果が大きい填料を配合し、紙中填料率を上昇させることが有効である。紙中填料率の上昇は、それに加えて平滑性を向上させる効果をもたらすが、クリア塗工印刷用紙では、紙中填料率を上昇させると、抄造時の填料歩留まりが大きく低下し、安定操業が困難になることや、高灰分化によってオフセット印刷機内で発生する紙粉が多くなったり、層間強度の低下により層間剥離のトラブルが多くなる問題点がある。   It is known that increasing the opacity of paper is the most effective way to reduce the back-through when printing on clear coated printing paper. As a method for increasing the opacity of paper, it is effective to increase the filler ratio in the paper by blending a filler having a high specific scattering coefficient and a large effect of increasing opacity. An increase in the filler content in paper has the effect of improving smoothness, but in clear-coated printing paper, increasing the filler content in paper greatly reduces the yield of the filler during papermaking, which leads to stable operation. There are problems that it becomes difficult, paper dust generated in the offset printing machine increases due to high ash differentiation, and trouble of delamination increases due to a decrease in interlayer strength.

このため、紙の抄造時で歩留り向上剤として従来から使用されている極限粘度法による重量平均分子量が最高でも約1,000万程度のカチオン性又はアニオン性ポリアクリルアミド系歩留り向上剤を添加する１液歩留り処方（シングルポリマーシステム）や、カチオン性高分子電解質添加後、前記のカチオン性又はアニオン性ポリアクリルアミド系歩留り向上剤を添加する２液歩留り処方（デュアルポリマーシステム）では、地合を良好に維持した場合には、微細繊維や填料などの微細成分の十分な歩留りが得られなかった。この歩留り低下のため、ワイヤーを通過した微細成分が白水中に蓄積し、ポリディスクフィルターや浮上分離装置等の白水処理設備の負荷が増大し、白水を処理できない事態に陥いることもあった。また、ワイヤーを通過した微細成分が紙料中に次第に蓄積する結果、抄紙機ストックインレットに供給する紙料の固形分濃度が次第に高くなり、抄造が不安定となり、最悪の場合、最終的に抄紙自体が不可能となる事態も起こることがあった。これらの抄紙中断による経済的損失は非常に大きく極めて重大な問題である。また、抄紙系外へ排水として排出される白水中には多量の有価物であるパルプ繊維や填料などの微細粒子が含まれており、この経済的損失も大きく、さらに排水処理設備の負荷が増大するという問題もあった。   For this reason, a one-component yield is added by adding a cationic or anionic polyacrylamide type yield improver having a weight average molecular weight of about 10 million at the maximum by the intrinsic viscosity method conventionally used as a yield improver during paper making. The formulation (single polymer system) and the two-component yield formulation (dual polymer system) in which the cationic or anionic polyacrylamide-based yield improver is added after the addition of the cationic polyelectrolyte maintains the formation well. In some cases, a sufficient yield of fine components such as fine fibers and fillers could not be obtained. Due to this decrease in yield, fine components that have passed through the wire accumulate in the white water, increasing the load on white water treatment equipment such as polydisc filters and flotation separators, which may lead to a situation where white water cannot be treated. In addition, as a result of the gradual accumulation of fine components that have passed through the wire in the stock, the solids concentration of the stock supplied to the paper machine stock inlet becomes gradually higher, making the paper unstable, and in the worst case, finally the paper Occasionally, it became impossible. The economic losses due to these paper interruptions are very large and extremely serious. In addition, white water discharged as wastewater outside the papermaking system contains a large amount of fine particles such as pulp fibers and fillers, and this economic loss is large, and the load on wastewater treatment facilities increases. There was also a problem of doing.

上記１液歩留り処方や２液歩留り処方で、歩留り向上剤の添加濃度を高くすれば、微細成分の歩留りは多少改善されるが歩留り向上は頭打ちとなるため、満足できる歩留りは得られず、依然として抄造が不安定であり、かつ抄造して得られる用紙の地合が悪化するという問題があった。   If the additive concentration of the yield improver is increased in the above-mentioned one-liquid yield formulation or two-liquid yield formulation, the yield of the fine component is improved to some extent, but the yield improvement reaches its peak, so a satisfactory yield cannot be obtained and still remains. There is a problem that papermaking is unstable and the formation of paper obtained by papermaking deteriorates.

抄造時の微細成分の歩留りを改善する技術としては、例えば、炭酸カルシウムを主体とする填料を含有する製紙原料を用いて、中性〜弱アルカリ性で抄紙する場合において、新聞用紙では製紙原料に重合系カチオン性水溶性高分子及び／又は重縮合系カチオン性物質を添加した後、アニオン性水溶性高分子を添加して抄紙する方法が特許文献１に開示されている。また、機械パルプ及び／又は脱墨パルプを多量に含む中性〜アルカリ性領域の抄造における歩留りや濾水性を改善することを課題として、機械パルプ及び／又は脱墨パルプを30〜100重量%含むパルプと填料とからなる、固形分濃度0.1〜1.5重量%、pH＝6〜10の紙料に対して、カチオン性高分子電解質、アニオン性高分子物質及びベントナイトを、この順序で添加する技術が特許文献２に開示されている。また、機械パルプ及び／又は脱墨パルプを多量に含む紙料系を中性〜アルカリ性領域で抄造する際の歩留りと濾水性の改善を課題として、機械パルプ及び／又は脱墨パルプを全パルプ成分に対して30〜100重量%含むパルプと填料を主成分とし、固形分濃度が0.1〜1.5重量%で、pH＝6〜10の紙料に対して、カチオン性凝結剤、フェノール系化合物、ノニオン性凝集剤をこの順序で添加し、かつカチオン性凝結剤とフェノール系化合物の比率が25：75〜75：25の範囲とする技術が特許文献３に開示されている。これらの技術により、用紙抄造時の微細成分の歩留りは若干改善されるが、未だ十分な効果とは言えない。   As a technology to improve the yield of fine components at the time of papermaking, for example, when making paper with neutral to weak alkali using a papermaking raw material containing a filler mainly composed of calcium carbonate, it is polymerized into a papermaking raw material in newsprint paper Patent Document 1 discloses a method of making paper by adding an anionic water-soluble polymer after adding a cationic water-soluble polymer and / or a polycondensation cationic material. In addition, a pulp containing 30 to 100% by weight of mechanical pulp and / or deinked pulp for the purpose of improving yield and drainage in papermaking in a neutral to alkaline region containing a large amount of mechanical pulp and / or deinked pulp Patented technology for adding cationic polyelectrolyte, anionic polymer substance and bentonite in this order to a paper stock consisting of a filler and a solid content of 0.1 to 1.5% by weight and pH = 6 to 10 It is disclosed in Document 2. In addition, mechanical pulp and / or deinked pulp are all pulp components for the purpose of improving the yield and drainage when making a paper system containing a large amount of mechanical pulp and / or deinked pulp in the neutral to alkaline region. Containing 30 to 100% by weight of pulp and filler, solid content of 0.1 to 1.5% by weight, and pH = 6 to 10 paper, cationic coagulant, phenolic compound, nonion Patent Document 3 discloses a technique in which a cationic flocculant is added in this order and the ratio of the cationic coagulant to the phenol compound is in the range of 25:75 to 75:25. Although these techniques slightly improve the yield of fine components at the time of paper making, it is still not a sufficient effect.

特開２００２−２２７０９３号公報JP 2002-227093 A 特開平９−２５００９５号公報Japanese Patent Laid-Open No. 9-250095 特開平１１−２４７０８９号公報Japanese Patent Laid-Open No. 11-247089

本発明が解決しようとする課題は、クリア塗工印刷用紙の抄造時の填料歩留まりが高く、かつオフセット印刷時に層間剥離や紙粉発生が少なく、さらに不透明度が高く裏抜けが少なく、かつ平滑度が高いため印刷品質に優れるクリア塗工印刷用紙を提供することにある。   The problem to be solved by the present invention is that the yield of the filler when making clear coated printing paper is high, and that there is little delamination and paper dust generation during offset printing, furthermore, there is little opacity and little show-through, and smoothness It is to provide a clear coated printing paper that is excellent in print quality because of its high value.

本発明者らは、クリア塗工印刷用紙を抄造する場合の填料歩留り改善について鋭意研究した結果、ジアリルジメチルアンモウニウムクロライドのホモポリマー又は、ジアリルジメチルアンモウニウムクロライドと(メタ)アクリルアミドとのコポリマーを成分とするカチオン性高分子化合物により処理した炭酸カルシウムを填料として用い、紙中填料率として３〜40固形分重量%含有するクリア塗工印刷用原紙に、表面紙力剤を塗工して、密度が0.3〜0.9g/cm³のクリア塗工印刷用紙を得ることにより、課題を解決した。 As a result of diligent research on improving the filler yield when paper-making clear coated printing paper, the present inventors have found that a homopolymer of diallyldimethylammonium chloride or a copolymer of diallyldimethylammonium chloride and (meth) acrylamide Applying a surface paper strength agent to clear coated printing base paper containing 3 to 40% solid content by weight of calcium carbonate treated with a cationic polymer compound as a filler. The problem was solved by obtaining clear coated printing paper with a density of 0.3-0.9 g / cm ³ .

クリア塗工印刷用紙の抄造時の填料歩留まりが高く、かつオフセット印刷機での使用時に層間剥離や紙粉発生が少なく、さらに不透明度が高く両面印刷時の裏抜けが少ないクリア塗工印刷用紙を提供できる。   Clear coated printing paper with high filler yield when making clear coated printing paper, low delamination and paper dust generation when used on offset printing machines, and high transparency and low back-through when printing on both sides. Can be provided.

本発明で製造されるクリア塗工印刷用紙のパルプ原料としては、特に限定されるものではなく、広葉樹クラフトパルプ（ＬＫＰ）、針葉樹クラフトパルプ（ＮＫＰ）、脱墨パルプ（ＤＩＰ）、グランドパルプ（ＧＰ）、サーモメカニカルパルプ（ＴＭＰ）、ケミサーモメカニカルパルプ（ＣＴＭＰ）等、クリア塗工印刷用紙の抄紙原料として一般的に使用されているものであればよく、クリア塗工印刷用紙の種類や求められる品質に応じて、これらのパルプを適宜配合して使用する。   The pulp raw material of the clear coated printing paper produced by the present invention is not particularly limited, and is broad-leaved kraft pulp (LKP), softwood kraft pulp (NKP), deinked pulp (DIP), ground pulp (GP) ), Thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), etc., as long as they are generally used as a papermaking raw material for clear coated printing paper, and the type and demand of clear coated printing paper are required. Depending on the quality, these pulps are appropriately blended and used.

本発明のクリア塗工印刷用紙に含有される填料は、炭酸カルシウムまたは炭酸カルシウム−シリカ複合物である。炭酸カルシウムは、重質炭酸カルシウムも軽質炭酸カルシウムも使用可能であるが、抄紙機のワイヤー摩耗性とクリア塗工印刷用紙の品質の面から、軽質炭酸カルシウムの使用が好ましい。軽質炭酸カルシウムの中では、一次粒子が凝集して二次粒子を形成しているものがさらに好ましい。一次粒子が凝集して二次粒子を形成している軽質炭酸カルシウムの中でもロゼッタ型軽質炭酸カルシウムが最も好ましい。   The filler contained in the clear coated printing paper of the present invention is calcium carbonate or a calcium carbonate-silica composite. As the calcium carbonate, heavy calcium carbonate or light calcium carbonate can be used, but light calcium carbonate is preferably used from the viewpoint of wire wear of the paper machine and the quality of the clear coated printing paper. Among the light calcium carbonates, it is more preferable that primary particles aggregate to form secondary particles. Among the light calcium carbonates in which primary particles are aggregated to form secondary particles, rosetta type light calcium carbonate is most preferable.

上記の填料は、紙料への添加に先立って、ジアリルジメチルアンモニウムクロライド(以下、「DADMAC」という)のホモポリマー又はDADMACと(メタ)アクリルアドとのコポリマーと予め混合して処理される必要がある。
以下にその処理の詳細を説明する。 Prior to the addition to the stock, the above filler must be premixed with a homopolymer of diallyldimethylammonium chloride (hereinafter referred to as “DADMAC”) or a copolymer of DADMAC and (meth) acrylic adduct. is there.
Details of the processing will be described below.

本発明で使用するDADMACのホモポリマー又は、DADMACと(メタ)アクリルアミドとのコポリマーを成分とするカチオン性高分子化合物は、市販品の中から適宜選択して使用できる。   The cationic polymer compound containing as a component a homopolymer of DADMAC or a copolymer of DADMAC and (meth) acrylamide used in the present invention can be appropriately selected from commercially available products.

DADMACと共重合させる(メタ)アクリルアミドは、直鎖又は分岐状のアルキル基を有しているものであり、具体的には、エチルヘキシル(メタ)アクリルアミド、ジエチルアミノプロピル(メタ)アクリルアミド、ジメチルアミノヒドロキシプロピル(メタ)アクリルアミド、N−イソプロピル(メタ)アクリルアミド、N−第3−ブチル−(メタ)アクリルアミド、C₁〜C₁₀N−アルキル(メタ)アクリルアミド、N−アリルアルキルアミド、N−イソプロピル(メタ)アクリルアミド、N,N−ジメチルアクリルアミドアクリルアミド、C₁〜C₁₀N,N−ジアルキルメタクリルアミド、N,N−ジアリル(メタ)アクリルアミド、N,N−ジアリルアルキル(メタ)アクリルアミド等が挙げられる。 (Meth) acrylamide to be copolymerized with DADMAC has a linear or branched alkyl group, specifically, ethylhexyl (meth) acrylamide, diethylaminopropyl (meth) acrylamide, dimethylaminohydroxypropyl. (meth) acrylamide, N- isopropyl (meth) acrylamide, N- tert-butyl - (meth) acrylamides, C ₁ ~C ₁₀ N- alkyl (meth) acrylamide, N- allyl alkylamides, N- isopropyl (meth) Examples include acrylamide, N, N-dimethylacrylamide acrylamide, C _{1 to} C ₁₀ N, N-dialkylmethacrylamide, N, N-diallyl (meth) acrylamide, N, N-diallylalkyl (meth) acrylamide and the like.

DADMACのホモポリマー又はDADMACと(メタ)アクリルアミドとのコポリマーの重量平均分子量は特に限定は無い。また、カチオン電荷密度は0.1〜50meq/gが好ましく、0.5〜10meq/gがさらに好ましい。コポリマー中のDADMACと(メタ)アクリルアミドのモル比は、この電荷密度になるようにすることが好ましい。50meq/gを越えるものは、製造コストが高くなり、実用的ではなく、0.1meｑ/g未満では、本発明の填料歩留り向上効果が小さくなる。   The weight average molecular weight of the homopolymer of DADMAC or the copolymer of DADMAC and (meth) acrylamide is not particularly limited. The cationic charge density is preferably 0.1 to 50 meq / g, more preferably 0.5 to 10 meq / g. The molar ratio of DADMAC to (meth) acrylamide in the copolymer is preferably set to this charge density. If it exceeds 50 meq / g, the production cost is high and is not practical, and if it is less than 0.1 meq / g, the filler yield improvement effect of the present invention becomes small.

填料に対するDADMACのホモポリマー又はDADMACと(メタ)アクリルアミドとのコポリマーの添加量は、填料固形分100重量部に対し、ポリマー固形分として0.05〜2.0重量部であり、0.10〜1.0重量部が好ましく、0.10〜0.50重量部がさらに好ましい。0.05重量部未満では、填料歩留り向上効果が小さく、2.0重量部を越えて添加しても填料歩留り向上効果が頭打ちとなり、処理コストが高くなるという問題がある。   The amount of DADMAC homopolymer or DADMAC and (meth) acrylamide copolymer added to the filler is 0.05 to 2.0 parts by weight, preferably 0.10 to 1.0 parts by weight, as polymer solids with respect to 100 parts by weight of filler solids, More preferred is 0.10 to 0.50 parts by weight. If the amount is less than 0.05 parts by weight, the effect of improving the filler yield is small, and even if the amount exceeds 2.0 parts by weight, the effect of improving the filler yield reaches a peak, and the processing cost is increased.

DADMACのホモポリマー又はDADMACと(メタ)アクリルアミドとのコポリマーを添加する填料の水分散液の固形分濃度は良く混合できる濃度であれば良く、特に限定は無いが、通常は1〜50%である。
填料と該ポリマーとの混合に用いる装置は、混合を充分に行える装置であれば良く、特に限定はないが、例えば、プロペラ羽根、タービン羽根、パドル翼等を有する一般的な撹拌機、ディスパーザー等の高速回転遠心放射型撹拌機、ホモジナイザー、ホモミキサー、ウルトラミキサー等の高速回転剪断型撹拌機、コロイドミル又はプラネタリーミキサー等の乳化機等が挙げられる。 The solid content concentration of the aqueous dispersion of the filler to which the homopolymer of DADMAC or the copolymer of DADMAC and (meth) acrylamide is added is not particularly limited, but is usually 1 to 50%. .
The apparatus used for mixing the filler and the polymer is not particularly limited as long as the apparatus can sufficiently perform mixing. For example, a general agitator having a propeller blade, a turbine blade, a paddle blade, etc., a disperser And a high-speed rotary centrifugal type agitator such as a high-speed rotary shear type agitator such as a homogenizer, a homomixer, and an ultra mixer, and an emulsifier such as a colloid mill or a planetary mixer.

DADMACのホモポリマー又はDADMACと(メタ)アクリルアミドとのコポリマーで処理した填料のレーザー回折散乱法による平均粒子径は、未処理填料の平均粒子径の1.0〜2.0倍であり、1.0〜1.5倍が好ましい。2.0倍を越えると、填料歩留り向上効果に問題はないが、填料が大きな凝集体となって紙層内に存在することになるために、不透明度や白色度の向上効果が小さくなる。   The average particle diameter of the filler treated with the DADMAC homopolymer or the copolymer of DADMAC and (meth) acrylamide by the laser diffraction scattering method is 1.0 to 2.0 times the average particle diameter of the untreated filler, preferably 1.0 to 1.5 times. . If it exceeds 2.0 times, there is no problem in the filler yield improvement effect, but since the filler becomes a large aggregate and exists in the paper layer, the effect of improving opacity and whiteness becomes small.

上記の混合を行った分散液は、タンク等の設備に一時貯えた後、紙料へ添加しても良いが、混合後、直ちに紙料へ添加する方が好ましい。   The dispersion liquid after the above mixing may be temporarily stored in a tank or the like and then added to the paper stock. However, it is preferable to add it to the paper stock immediately after mixing.

本発明のクリア塗工印刷用紙の紙中填料率は、３〜40固形分重量%である。好ましくは3〜30固形分重量%、さらに好ましくは3〜20固形分重量%である。３固形分重量%未満では、填料の歩留まりは良好でオフセット印刷機での層間剥離や紙粉の問題はないが、不透明度が十分ではないため裏抜けが大きく、平滑度が低いため印面は優れないという問題がある。40固形分重量%を超えると、パルプ繊維分が少ないため填料の歩留まりが低下してしまい、また紙粉量も多く問題となる。   The filler content in the clear coated printing paper of the present invention is 3 to 40% by solid weight. Preferably it is 3-30 solid content weight%, More preferably, it is 3-20 solid content weight%. If the solid content is less than 3% by weight, the yield of the filler is good and there is no problem of delamination or paper dust on the offset printing machine, but the surface is excellent because the back-through is large because the opacity is not sufficient and the smoothness is low. There is no problem. If the solid content exceeds 40% by weight, the pulp fiber content is low, so the yield of the filler is lowered, and the amount of paper powder is also problematic.

本発明のクリア塗工印刷用紙を抄造するために用いられる抄紙機は、紙の2面性を抑制する意味で、両面脱水機構を有している、オントップフォーマー、ギャップフォーマ等が望ましいが、これに限定されるものではない。プレス、キャレンダー等は通常の操業範囲内の条件で処理を行えば良い。   The paper machine used to make the clear coated printing paper of the present invention is preferably an on-top former, a gap former or the like having a double-side dewatering mechanism in order to suppress the two-sided nature of the paper. However, the present invention is not limited to this. The press, calendar, etc. may be processed under conditions within the normal operating range.

本発明のクリア塗工印刷用紙の製造には、表面強度の強化を目的とした表面紙力剤の塗工が必須である。塗工する表面処理剤中の表面紙力剤は、生澱粉や、酸化澱粉、エステル化澱粉、カチオン化澱粉、熱変性澱粉、酵素変性澱粉、アルデヒド化澱粉、ヒドロキシエチル化澱粉等の変性澱粉、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、メチルセルロース等のセルロース誘導体、ポリビニルアルコール、カルボキシル変性ポリビニルアルコール等の変性アルコール、スチレンブタジエン共重合体、ポリ酢酸ビニル、塩化ビニル−酢酸ビニル共重合体、ポリ塩化ビニル、ポリ塩化ビニリデン、ポリアクリル酸エステル又はポリアクリルアミド等を単独又は併用する。その中でも表面強度向上効果にすぐれるヒドロキシエチル化澱粉が最も好ましい。   In the production of the clear coated printing paper of the present invention, it is essential to apply a surface paper strength agent for the purpose of enhancing the surface strength. The surface paper strength agent in the surface treatment agent to be coated is raw starch, oxidized starch, esterified starch, cationized starch, heat-denatured starch, enzyme-modified starch, aldehyde-modified starch, hydroxyethylated starch and other modified starches, Cellulose derivatives such as carboxymethylcellulose, hydroxyethylcellulose, methylcellulose, modified alcohols such as polyvinyl alcohol and carboxyl-modified polyvinyl alcohol, styrene butadiene copolymer, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, polyvinyl chloride, polyvinylidene chloride Polyacrylic acid ester or polyacrylamide is used alone or in combination. Of these, hydroxyethylated starch is most preferred because of its excellent effect of improving surface strength.

また、表面処理剤中には、前記の表面紙力剤以外にスチレンアクリル酸、スチレンマレイン酸、オレフィン系化合物等一般的な表面サイズ剤を配合し、原紙表面に塗工することができるが、この場合、表面サイズ剤のイオン性がカチオン性であることで非常に良好な表面強度を得られることを見出した。
その理由は、本発明での予備凝集填料はカチオン性であるので、カチオン性の表面サイズ剤の方がより表面にサイズ剤が留まって塗工され、紙のサイズ性が向上する。サイズ性が向上すれば、クリア塗工印刷用紙に要求されることが多い、ペン書きサイズ度を高くできる。 Further, in the surface treatment agent, in addition to the above surface paper strength agent, a general surface sizing agent such as styrene acrylic acid, styrene maleic acid, olefinic compound can be blended and coated on the base paper surface, In this case, it was found that very good surface strength can be obtained because the ionicity of the surface sizing agent is cationic.
The reason is that since the pre-aggregated filler in the present invention is cationic, the cationic surface sizing agent is applied with the sizing agent remaining on the surface, and the paper size is improved. If the size is improved, the pen writing sizing degree, which is often required for clear-coated printing paper, can be increased.

表面紙力剤と表面サイズ剤からなる表面処理剤をクリア塗工印刷用紙原紙に塗工する場合、表面紙力剤と表面サイズ剤との混合比率は公知の範囲で行えば良く、特に限定はない。   When a surface treatment agent composed of a surface paper strength agent and a surface sizing agent is applied to a clear coated printing paper base paper, the mixing ratio of the surface paper strength agent and the surface sizing agent may be within a known range. Absent.

クリア塗工印刷用紙に表面塗工剤を塗工する装置は公用のものであれば良く、特に限定はないが、シムサイザーやゲートロールサイズプレス等のフィルム転写型が好ましい。   The apparatus for applying the surface coating agent to the clear coated printing paper is not particularly limited as long as it is a public device, and a film transfer type such as a shim sizer or a gate roll size press is preferable.

内添薬品としては、ポリアクリルアミド、カチオン化澱粉等の乾燥紙力剤及び／又はポリアミドアミンエピクロロヒドリン等の湿潤紙力剤を添加することができる。また、填料の歩留まりをさらに高める目的で、公知の無機凝集剤（硫酸バンド等）や有機高分子系凝集剤を添加することもでき、公知の高歩留まりシステム（例えば、ハイドロコールシステム、コンポジルシステム等）を併用することもできる。   As internal chemicals, dry paper strength agents such as polyacrylamide and cationized starch and / or wet strength materials such as polyamidoamine epichlorohydrin can be added. In order to further increase the yield of the filler, a known inorganic flocculant (sulfuric acid band or the like) or an organic polymer flocculant can be added, and a known high-yield system (for example, a hydrocoal system, a compositor system). Etc.) can be used in combination.

本発明のクリア塗工印刷用紙では、前述の内添薬品の他に、紙用嵩高剤を内添し紙中に含有させることができる。この紙用嵩高剤を具体的に化合物で例示すると、油脂系非イオン界面活性剤、糖アルコール系非イオン活性剤、糖系非イオン界面活性剤、多価アルコール型非イオン界面活性剤、多価アルコールと脂肪酸のエステル化合物、高級アルコールあるいは高級脂肪酸のポリオキシアルキレン付加物、高級脂肪酸エステルのポリオキシアルキレン付加物、多価アルコールと脂肪酸のエステル化合物のポリオキシアルキレン付加物又は脂肪酸ポリアミドアミン等が挙げられる。   In the clear coated printing paper of the present invention, in addition to the aforementioned internal chemicals, a paper bulking agent can be internally added and contained in the paper. Specific examples of the bulking agent for paper include oil-based nonionic surfactants, sugar alcohol-based nonionic surfactants, sugar-based nonionic surfactants, polyhydric alcohol-type nonionic surfactants, polyvalent alcohols Examples include alcohol and fatty acid ester compounds, higher alcohols or higher fatty acid polyoxyalkylene adducts, higher fatty acid ester polyoxyalkylene adducts, polyhydric alcohol and fatty acid ester compounds polyoxyalkylene adducts, or fatty acid polyamidoamines. It is done.

この紙用嵩高剤を特許文献で例示すると、次の通りである。特許第3128248号公報記載の紙用嵩高剤、特許第3453505号公報記載の紙用嵩高剤、特許第3482336号公報記載の紙用嵩高剤、特許第3537692号公報記載の紙用嵩高剤、特許第3482337号公報記載の紙用嵩高剤、特許第2971447号公報記載の紙用嵩高剤、特許第3283248号公報記載の抄紙用紙質向上剤、特許第3387033号公報記載の乾燥効率向上剤、特許第3387036号公報記載の平滑性及び透気性向上剤、特許第3517200号公報記載の抄紙用添加剤、特開2001-248100号公報記載の抄紙用紙質向上剤、特開2003-336196号公報記載の紙質向上剤、特開2004-052216号公報記載の抄紙用紙質向上剤、特開2005-187989号公報記載の紙質向上剤、特開2004-107865号公報記載の紙質向上剤、特開2004-091950号公報記載の紙質向上剤、特開2005-299010号記載の紙質向上剤、特開2005-299011号公報記載の紙質向上剤、特開2005-299012号公報記載の紙質向上剤、特開2005-089953号公報記載の紙用嵩高剤、特開2000-273792号公報記載の紙用不透明化剤、特開2002-129497号公報記載の古紙再生用添加剤、特開2002-275786号公報記載の古紙再生用添加剤、特開2002-294586号公報記載の古紙再生用添加剤、特開2002-294594号公報記載の嵩高剤、特開2003-96692号公報記載の紙用嵩高剤、特開2003-96693号記載の嵩高剤、特開2003-96694号公報記載の古紙再生用添加剤、特開2003-96695号公報記載の古紙再生用添加剤、特開2003-171897号公報記載の紙厚向上剤、特開2003-247197号公報記載の紙用嵩高剤、特開2003-253588号公報記載の紙用嵩高剤、特開2003-253589号公報記載の紙用嵩高剤、特開2003-253590号公報の紙用嵩高剤、特開2003-328297号公報記載の紙用低密度化剤、特開2003-313799号公報記載の紙用低密度化剤、特開2004-11058号公報記載の抄紙用添加剤、特開2004-27401号公報記載の紙用低密度化剤、特開2004-115935号公報記載の紙用低密度化剤、特開2004-76244号公報記載の紙用嵩高剤、特開2004-176213号公報記載の紙用改質剤、特許第3521422号公報記載の紙用柔軟化剤、特開2002-275792号公報記載の嵩高柔軟化剤、特開2002-285494号公報記載の製紙用嵩高サイズ剤、特開2003-286692号公報記載の紙用嵩高剤、特開2004-270074号公報記載の製紙用嵩高剤組成物、特開2004-285490号公報記載の製紙用嵩高剤、特開2003-221799号公報記載の不透明度向上剤、特開2004-308095号公報記載の紙用添加剤、特開2005-042278号公報記載の嵩高剤、特開2005-042279号公報記載の嵩高剤、特開2005-060891号公報記載の製紙用嵩高剤、特開2005-082943号公報記載の紙用低密度化剤、特開2005-082949号公報記載の紙用改質剤。   This paper bulking agent is exemplified in the patent literature as follows. Paper bulking agent described in Japanese Patent No. 3128248, paper bulking agent described in Japanese Patent No. 3453505, paper bulking agent described in Japanese Patent No. 3482336, paper bulking agent described in Japanese Patent No. 3576962, Patent No. No. 3482337, a paper bulking agent described in Japanese Patent No. 2971447, a paper making paper quality improving agent described in Japanese Patent No. 3283248, a drying efficiency improving agent described in Japanese Patent No. 3338333, and a Japanese Patent No. 3387036. Smoothness and air permeability improver described in Japanese Patent No. 3517200, additive for papermaking described in Japanese Patent No. 3517200, paper quality improver described in Japanese Patent Laid-Open No. 2001-248100, and paper quality improvement described in Japanese Patent Laid-Open No. 2003-336196 Paper quality improver described in JP 2004-052216 A, paper quality improver described in JP 2005-187989, paper quality improver described in JP 2004-107865, JP 2004-091950 A The paper quality improver described in JP-A-2005-299010, the paper quality improver described in JP-A-2005-299011, JP-A-20 Paper quality improver described in Japanese Patent Application Laid-Open No. 05-299012, paper bulking agent described in Japanese Patent Application Laid-Open No. 2005-089953, paper opacifying agent described in Japanese Patent Application Laid-Open No. 2000-273792, waste paper described in Japanese Patent Application Laid-Open No. 2002-129497 Recycling additive, waste paper recycling additive described in JP-A-2002-275786, waste paper recycling additive described in JP-A-2002-294586, bulking agent described in JP-A-2002-294594, JP-A 2003 -96692 paper bulking agent, JP 2003-96693 bulking agent, JP 2003-96694 JP waste paper recycling additive, JP 2003-96695 JP waste paper recycling additive Agent, paper thickness improver described in JP2003-171897, paper bulking agent described in JP2003-247197, paper bulking agent described in JP2003-253588, JP2003-253589 Paper bulking agent described in the publication, paper bulking agent disclosed in JP2003-253590, paper density reducing agent described in JP2003-328297, paper low density described in JP2003-313799A Agent, Japanese Patent Application Laid-Open No. 2004-11058 Paper making additives described in Japanese Laid-Open Patent Publication No. 2004-27401, paper density reducing agents described in Japanese Patent Application Laid-Open No. 2004-27401, paper density reducing agents described in Japanese Patent Application Laid-Open No. 2004-115935, paper described in Japanese Patent Application Laid-Open No. 2004-76244 Bulking agent for paper, paper modifier described in JP-A-2004-176213, paper softening agent described in Japanese Patent No. 3521422, bulky softening agent described in JP-A-2002-275792, JP-A 2002- A paper bulking sizing agent described in Japanese Patent No. 285494, a paper bulking agent described in Japanese Patent Laid-Open No. 2003-286692, a paper bulking agent composition described in Japanese Patent Laid-Open No. 2004-270074, and a paper bulking agent composition described in Japanese Patent Laid-Open No. 2004-285490. Bulkiness agent for papermaking, opacity improver described in JP-A-2003-221799, additive for paper described in JP-A-2004-308095, bulking agent described in JP-A-2005-042278, JP-A-2005-042279 Bulking agent described in Japanese Patent Publication No. 2005-060891, a paper bulking agent described in Japanese Patent Publication No. 2005-060891, a paper density reducing agent described in Japanese Patent Publication No. 2005-082943, and paper reforming described in Japanese Patent Publication No. 2005-082949. Agent.

得られるクリア塗工印刷用紙の密度は、０．３〜０．９g/cm³の範囲であれば良く、通常のクリア塗工印刷用紙の摩擦係数等を有するレベルであれば良い。 The density of the clear coated printing paper to be obtained may be in the range of 0.3 to 0.9 g / cm ³ and may be a level having a friction coefficient of normal clear coated printing paper.

（実施例）
以下、本発明を実施例及び比較例を挙げて、より具体的に説明するが、本発明はこれらに限定されるものではない。
なお、実施例、比較例中の％は特に断りのない限り重量％を示す。
また、実施例において用いた印刷試験方法及び印刷試験の評価方法を示す。 (Example)
EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated more concretely, this invention is not limited to these.
In the examples and comparative examples, “%” represents “% by weight” unless otherwise specified.
Moreover, the printing test method used in the Example and the evaluation method of a printing test are shown.

紙料をオントップ型抄紙機にて抄速800m/分で坪量60.0g/m²のクリア塗工印刷用紙原紙を抄造し、オンマシンのゲートロールコーターで表面処理剤を固形分重量で両面あたり1.3g/m²塗工し、クリア塗工印刷用紙を得た。抄造中の紙料歩留りと填料歩留りを以下の方法で測定した。また、得られたクリア塗工印刷用紙の印刷適性を以下の測定方法で評価した。 The base material is made of clear coated printing paper with a basis weight of 60.0 g / m ² at a paper making speed of 800 m / min using an on-top paper machine, and the surface treatment agent is coated on both sides with a solid weight by an on-machine gate roll coater. 1.3 g / m ² per coating was applied to obtain a clear coated printing paper. Paper yield and filler yield during papermaking were measured by the following methods. Further, the printability of the clear coated printing paper obtained was evaluated by the following measuring method.

（１）填料の歩留り
ストックインレット原料とワイヤー下に抜け落ちた白水(ワイヤー下白水と記述する)について、それぞれ灰分濃度を測定した。下記式(１)により填料歩留りを測定した。
填料歩留り＝100×(A−B)／A …計算式(１)
A：ストックインレット原料の灰分濃度(g/l)
B：ワイヤー下白水の灰分濃度(g/l)
灰分の測定：ストックインレット原料とワイヤー下白水について、その固形分を525℃で灰化した。 (1) Yield of filler The ash content was measured for the stock inlet raw material and white water that had fallen under the wire (described as white water under the wire). The filler yield was measured by the following formula (1).
Filler yield = 100 x (A-B) / A ... Formula (1)
A: Ash content (g / l) of stock inlet raw material
B: Ash concentration in white water under wire (g / l)
Ash content measurement: The solid content of the stock inlet raw material and the white water under the wire was ashed at 525 ° C.

（２）層間剥離、紙粉量、裏抜けの測定
枚葉オフセット印刷機（KOMORI社PERFECTOR44）を用い、四六判横目通紙で8500枚／時の速度で両面モノクロ印刷を行い、3000枚印刷したときの層間剥離の有無の確認、ブランケット堆積紙粉の目視での評価を行った。裏抜けは、3000部印刷時の墨ベタ面を裏面から目視して評価した。 (2) Measurement of delamination, amount of paper dust, and back-through Using a sheet-fed offset printing machine (KOMORI PERFECTOR44), double-sided monochrome printing was performed at a speed of 8500 sheets / hour on a 46-sheet wide-width sheet, printing 3000 sheets Confirmation of the presence or absence of delamination at the time, and visual evaluation of blanket deposited paper powder. The strike-through was evaluated by visually observing the black solid surface from the back when 3000 copies were printed.

［実施例１］
填料として軽質炭酸カルシウム(東洋電化株式会社製、商品名：TNC−7BY、平均粒子径3.0μｍ)を用い、この15%スラリー液60重量部に、DADMACとアクリルアミドとのコポリマー(Ondeo Nalco株式会社製、商品名：N7527、カチオン電荷密度：3.58meq/g)の固形分0.06重量%液30重量部(填料固形分に対し0.2重量％に相当)を添加し、ミキサーで攪拌した。得られた前処理填料の平均粒子径は、3.8μｍであり、ほとんど凝集を起こしていなかった。
なお、填料の平均粒子径の測定は、レーザー回折散乱法(Sysmex株式会社製マスターサイザー2000)によって測定した。
原料パルプ（組成：NKP/LKP/TMP/GP/DIP=5/5/40/40/10）のスラリーにこの前処理填料をヘッドボックスで添加した紙料を抄紙し、表面処理剤としてヒドロキシエチル化澱粉を塗工し、紙中填料率が15重量%のクリア塗工印刷用紙を得た。 [Example 1]
Light calcium carbonate (made by Toyo Denka Co., Ltd., trade name: TNC-7BY, average particle size 3.0 μm) was used as a filler, and a copolymer of DADMAC and acrylamide (made by Ondeo Nalco Co., Ltd.) was added to 60 parts by weight of this 15% slurry. , 30 parts by weight of a 0.06 wt% solid (trade name: N7527, cation charge density: 3.58 meq / g) (corresponding to 0.2 wt% with respect to the solid content of the filler) was added and stirred with a mixer. The average particle diameter of the obtained pretreatment filler was 3.8 μm, and almost no aggregation occurred.
The average particle size of the filler was measured by a laser diffraction scattering method (Mastersizer 2000 manufactured by Sysmex Corporation).
Paper stock made by adding this pretreatment filler to the slurry of raw pulp (composition: NKP / LKP / TMP / GP / DIP = 5/5/40/40/10) in the head box is made, and hydroxyethyl is used as the surface treatment agent. The modified starch was applied to obtain a clear coated printing paper with a filler content of 15% by weight.

［実施例２］
填料としてTNC−7BYを用い、この15重量%スラリー液60重量部に、ポリジアリルジメチルアンモウニウムクロライド(Ondeo Nalco株式会社製、商品名：N2020、カチオン電荷密度：3.88meq/g)の固形分0.06重量%液30重量部(填料固形分に対し0.2重量％に相当)を添加し、ミキサーで撹拌した。得られた前処理填料の平均粒子径は、3.6μｍであり、ほとんど凝集を起こしていなかった。この前処理填料を用いて実施例１と同様にしてクリア塗工印刷用紙を得た。 [Example 2]
Using TNC-7BY as a filler, the solid content of polydiallyldimethylammonium chloride (manufactured by Ondeo Nalco Co., Ltd., trade name: N2020, cation charge density: 3.88 meq / g) was added to 60 parts by weight of this 15% by weight slurry. 30 parts by weight of a 0.06% by weight liquid (corresponding to 0.2% by weight with respect to the solid content of the filler) was added and stirred with a mixer. The average particle diameter of the obtained pretreatment filler was 3.6 μm, and almost no aggregation occurred. Using this pretreatment filler, clear coated printing paper was obtained in the same manner as in Example 1.

［比較例１］
原料パルプのスラリーに、上記実施例１で用いた前処理填料用の軽質炭酸カルシウムとDADMACとアクリルアミドとのコポリマーとをヘッドボックスで別々に添加した紙料を抄紙し、表面処理剤としてヒドロキシエチル化澱粉を塗工し、紙中填料率が15%のクリア塗工印刷用紙を得た。
なお、軽質炭酸カルシウムとDADMACとアクリルアミドとのコポリマーとの比率は、実施例１における前処理填料の比率と同じとした。 [Comparative Example 1]
Paper stock obtained by separately adding light calcium carbonate for pretreatment filler used in Example 1 above and a copolymer of DADMAC and acrylamide in the headbox to the raw pulp slurry is made into a hydroxyethylated surface treatment agent. Starch was coated to obtain a clear coated printing paper with a 15% filler content in the paper.
The ratio of light calcium carbonate, DADMAC and acrylamide copolymer was the same as the ratio of the pretreatment filler in Example 1.

［比較例２］
DADMACとアクリルアミドとのコポリマーとのコポリマーをポリジアリルジメチルアンモウニウムクロライドに変更した以外は比較例１と同様にしてクリア塗工印刷用紙を得た。 [Comparative Example 2]
A clear coated printing paper was obtained in the same manner as in Comparative Example 1 except that the copolymer of DADMAC and acrylamide was changed to polydiallyldimethylammonium chloride.

［比較例３］
填料としてTNC−7BYを用い、この15%スラリー液60重量部に、DADMACとアクリルアミドとのコポリマーN7527の0.06固形分重量%液6重量部(填料固形分に対し0.04重量％に相当)を添加し、ミキサーで撹拌した。得られた前処理填料の平均粒子径は、3.9μｍであり、ほとんど凝集を起こしていなかった。
この前処理填料を用いて実施例１と同様にしてクリア塗工印刷用紙を得た。 [Comparative Example 3]
Using TNC-7BY as a filler, add 60 parts by weight of this 15% slurry to 6 parts by weight of a 0.06% solids solution of DADMAC and acrylamide copolymer N7527 (corresponding to 0.04% by weight of the filler solids). And stirred with a mixer. The average particle diameter of the obtained pretreatment filler was 3.9 μm, and almost no aggregation occurred.
Using this pretreatment filler, clear coated printing paper was obtained in the same manner as in Example 1.

［比較例４］
填料としてTNC−7BYを用い、この15%スラリー液60重量部に、ポリジアリルジメチルアンモウニウムクロライドN2020の0.06固形分重量%液6重量部(填料固形分重量に対し0.04％に相当)を添加し、ミキサーで撹拌した。
得られた前処理填料の平均粒子径は、3.7μｍであり、ほとんど凝集を起こしていなかった。
この前処理填料を用いて実施例１と同様にしてクリア塗工印刷用紙を得た。 [Comparative Example 4]
Using TNC-7BY as a filler, to 60 parts by weight of this 15% slurry, add 6 parts by weight of a polydiallyldimethylammonium chloride N2020 0.06 solids weight% liquid (corresponding to 0.04% of the filler solids weight). And stirred with a mixer.
The average particle diameter of the obtained pretreatment filler was 3.7 μm, and almost no aggregation occurred.
Using this pretreatment filler, clear coated printing paper was obtained in the same manner as in Example 1.

［比較例５］
上記実施例１で用いた前処理填料を未処理のTNC−7BYに変更した以外は実施例１と同様にしてクリア塗工印刷用紙を得た。 [Comparative Example 5]
Clear coated printing paper was obtained in the same manner as in Example 1 except that the pretreatment filler used in Example 1 was changed to untreated TNC-7BY.

［比較例６］
実施例１で用いた前処理填料を、紙中填料率が2%となるように原料パルプへ添加した以外は実施例１と同様にしてクリア塗工印刷用紙を得た。 [Comparative Example 6]
A clear coated printing paper was obtained in the same manner as in Example 1 except that the pretreatment filler used in Example 1 was added to the raw material pulp so that the filler content in the paper was 2%.

［比較例７］
実施例１で用いた前処理填料を、紙中填料率が45%となるように原料パルプへ添加した以外は実施例１と同様にしてクリア塗工印刷用紙を得た。 [Comparative Example 7]
A clear coated printing paper was obtained in the same manner as in Example 1 except that the pretreatment filler used in Example 1 was added to the raw material pulp so that the filler content in the paper was 45%.

上記実施例１及び２並びに比較例１〜７におけるクリア塗工印刷用紙の填料歩留まり、層間剥離、紙粉及び裏抜けの測定結果を表１に示す。   Table 1 shows the measurement results of the filler yield, delamination, paper dust and back-through of the clear coated printing paper in Examples 1 and 2 and Comparative Examples 1-7.

実施例１及び２では、填料歩留まり、層間剥離、紙粉、裏抜けがいずれも良好であることがわかった。実施例1、2と比較例１、２の比較から、凝集填料を添加した方が填料と凝集剤とを別添加する方法よりも填料歩留まりが高くなり、層間強度が向上し、印刷後の紙粉量が少なくなることがわかった。比較例３、４では、軽質炭酸カルシウムを前処理する薬剤が少ないと填料歩留まり、層間剥離及び紙粉への効果が低いことがわかった。また、凝集填料の紙中填料率が2%と少ない比較例６では、填料歩留まりが良好で層間強度も高く、紙粉も少ないが、裏抜けが大きい。凝集填料の紙中填料率が45%と多い比較例７では、裏抜けは良好であるが、填料歩留まりが低く問題があり、層間強度も低く、紙粉の発生も多い。   In Examples 1 and 2, it was found that the filler yield, delamination, paper dust, and back-through were all good. From the comparison between Examples 1 and 2 and Comparative Examples 1 and 2, the addition of the agglomerated filler has a higher filler yield than the method of separately adding the filler and the aggregating agent, the interlayer strength is improved, and the printed paper It was found that the amount of powder decreased. In Comparative Examples 3 and 4, it was found that when the amount of the agent for pretreating light calcium carbonate was small, the filler yield was low and the effect on delamination and paper dust was low. Further, in Comparative Example 6 in which the filler content in the paper of the aggregate filler is as low as 2%, the filler yield is good, the interlayer strength is high, the paper dust is small, but the back-through is large. In Comparative Example 7 in which the filler content in the paper of the aggregate filler is as high as 45%, the back-through is good, but there is a problem that the filler yield is low, the interlayer strength is low, and the generation of paper dust is also large.

Claims (4)

ジアリルジメチルアンモウニウムクロライドのホモポリマー又はジアリルジメチルアンモウニウムクロライドと(メタ)アクリルアミドとのコポリマーを成分とするカチオン性高分子化合物により処理した炭酸カルシウムを填料として用い、紙中填料率として３〜４０固形分重量%含有するクリア塗工印刷用紙用原紙に、表面紙力剤を塗工して得られることを特徴とするクリア塗工印刷用紙。   Using calcium carbonate treated with a cationic polymer compound containing as a component a homopolymer of diallyldimethylammonium chloride or a copolymer of diallyldimethylammonium chloride and (meth) acrylamide as a filler, the filler ratio in paper is 3 to 3. A clear coated printing paper obtained by applying a surface paper strength agent to a base paper for clear coated printing paper containing 40% solids by weight. ジアリルジメチルアンモウニウムクロライドのホモポリマー又は、ジアリルジメチルアンモウニウムクロライドと(メタ)アクリルアミドとのコポリマーを成分とするカチオン性高分子化合物の填料に対する添加量が、填料固形分100重量部に対し、0.05〜2.0固形分重量部であることを特徴とする請求項１記載のクリア塗工印刷用紙。   The amount of addition to the filler of a cationic polymer compound comprising as a component a homopolymer of diallyldimethylammonium chloride or a copolymer of diallyldimethylammonium chloride and (meth) acrylamide is 100 parts by weight of filler solids, The clear coated printing paper according to claim 1, which is 0.05 to 2.0 solid parts by weight. 塗工する表面紙力剤が、ヒドロキシエチル化澱粉であることを特徴とする請求項１又は２に記載のいずれか１項に記載のクリア塗工印刷用紙。   The clear coated printing paper according to any one of claims 1 and 2, wherein the surface paper strength agent to be coated is hydroxyethylated starch. クリア塗工印刷用紙の密度が、０．３〜０．９g/cm³であることを特徴とする請求項１〜３に記載するいずれか１項に記載のクリア塗工印刷用紙。 The clear coated printing paper according to any one of claims 1 to ³ , wherein the density of the clear coated printing paper is 0.3 to 0.9 g / cm ³ .