JP2010116643A - Coated paper excellent in solvent resistance - Google Patents
Coated paper excellent in solvent resistance Download PDFInfo
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- JP2010116643A JP2010116643A JP2008290743A JP2008290743A JP2010116643A JP 2010116643 A JP2010116643 A JP 2010116643A JP 2008290743 A JP2008290743 A JP 2008290743A JP 2008290743 A JP2008290743 A JP 2008290743A JP 2010116643 A JP2010116643 A JP 2010116643A
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- paper
- resin component
- coated paper
- solvent resistance
- polyvinyl alcohol
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- 239000002904 solvent Substances 0.000 title abstract description 45
- 229920005989 resin Polymers 0.000 claims abstract description 62
- 239000011347 resin Substances 0.000 claims abstract description 62
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 39
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 39
- 239000000853 adhesive Substances 0.000 claims abstract description 37
- 230000001070 adhesive effect Effects 0.000 claims abstract description 35
- 239000000049 pigment Substances 0.000 claims abstract description 33
- 229920002125 Sokalan® Polymers 0.000 claims abstract description 27
- 239000004584 polyacrylic acid Substances 0.000 claims abstract description 25
- 239000005018 casein Substances 0.000 claims abstract description 24
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 235000021240 caseins Nutrition 0.000 claims abstract description 24
- 229920000126 latex Polymers 0.000 claims abstract description 22
- 239000004816 latex Substances 0.000 claims abstract description 22
- 229920003048 styrene butadiene rubber Polymers 0.000 claims abstract description 21
- 239000002174 Styrene-butadiene Substances 0.000 claims abstract description 20
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000011115 styrene butadiene Substances 0.000 claims abstract description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 44
- 239000011247 coating layer Substances 0.000 claims description 29
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 20
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical group O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 14
- 239000005995 Aluminium silicate Substances 0.000 claims description 13
- 235000012211 aluminium silicate Nutrition 0.000 claims description 13
- 239000004927 clay Substances 0.000 claims description 11
- 239000002649 leather substitute Substances 0.000 abstract description 25
- 239000002798 polar solvent Substances 0.000 abstract description 16
- 239000012454 non-polar solvent Substances 0.000 abstract description 13
- 238000012545 processing Methods 0.000 abstract description 6
- 239000000123 paper Substances 0.000 description 92
- 238000000034 method Methods 0.000 description 45
- 239000011248 coating agent Substances 0.000 description 27
- 238000000576 coating method Methods 0.000 description 26
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 21
- 235000010216 calcium carbonate Nutrition 0.000 description 21
- 239000010893 paper waste Substances 0.000 description 16
- 230000007547 defect Effects 0.000 description 13
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 12
- 229920001131 Pulp (paper) Polymers 0.000 description 9
- 230000035699 permeability Effects 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000005266 casting Methods 0.000 description 7
- 229920001577 copolymer Polymers 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 239000000178 monomer Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 4
- -1 acrylic ester Chemical class 0.000 description 4
- 238000013329 compounding Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 229920002472 Starch Polymers 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 239000011121 hardwood Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000008107 starch Substances 0.000 description 3
- 235000019698 starch Nutrition 0.000 description 3
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000006081 fluorescent whitening agent Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 239000011122 softwood Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 229920001353 Dextrin Polymers 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- 108010073771 Soybean Proteins Proteins 0.000 description 1
- 244000269722 Thea sinensis Species 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 description 1
- 229920006319 cationized starch Polymers 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 150000001993 dienes Chemical class 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- 239000001254 oxidized starch Substances 0.000 description 1
- 235000013808 oxidized starch Nutrition 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 235000018102 proteins Nutrition 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 235000019710 soybean protein Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 210000004243 sweat Anatomy 0.000 description 1
- 229910002029 synthetic silica gel Inorganic materials 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 1
- 229940007718 zinc hydroxide Drugs 0.000 description 1
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Landscapes
- Paper (AREA)
Abstract
Description
本発明は、極性溶剤及び非極性溶剤に対する耐性に優れた塗工紙に関するものである。より詳しくは、極性溶剤及び非極性溶剤を用いて製造する合成皮革の工程紙として利用するのに好適な塗工紙に関するものである。 The present invention relates to a coated paper having excellent resistance to polar solvents and nonpolar solvents. More specifically, the present invention relates to a coated paper suitable for use as a process paper for synthetic leather produced using a polar solvent and a nonpolar solvent.
塗工紙、特に塗工層がキャスト法により設けられたキャスト塗工紙は、産業用基材（例えば、マーキングシート、金属箔等の剥離紙など。）、包装用紙（例えば、紙袋、ブックカバーなど。）、工程紙（例えば、合成皮革やプラスチックフィルム等の工程紙。）などとして多用されている。工程紙として使用する際には、キャスト塗工紙上に溶剤と混合したモノマーを展開し、熱や電子線でモノマー同士を反応させることで、合成皮革やプラスチックフィルムなどを形成する。特に、例えば塩化ビニルやウレタン等を使用する合成皮革用途においては、工程紙表面に塩化ビニル等のペーストを塗工した後に加熱して塩化ビニル等を反応させた後、接着剤を塗工して裏地の基布と貼り合わせた後、再度加熱・冷却して、工程紙を剥離することで合成皮革を製造する。
このような工程紙は、塩化ビニルやウレタン等を用いることから、耐溶剤性に優れることが望まれ、例えば、接着剤としてゲル含量が８５％以上であるスチレン・ブタジエン系共重合体ラテックスを含有するキャスト塗工紙（例えば、特許文献１参照。）や、体積分布平均粒子径が３〜２０μｍである板状形状の顔料及びゲル含量８５％以上の合成樹脂ラテックスを含有する剥離紙用基紙（例えば、引用文献２参照。）が提案されている。
一方、近年、環境負荷低減の目的で、使用される溶剤が、非極性溶剤から極性溶剤に移行しつつあり、工程紙などには極性溶剤及び非極性溶剤の両方に対する耐溶剤性が求められている。しかも、耐溶剤性に関する要求も厳しくなっており、単に繰り返し使用しても塗工層が剥離し難いなどというものではなく、写像性や光沢度なども低下し難いといった高度の品質が求められるようになっている。特に合成皮革工程紙の分野においては、より高級感があり見栄えの良い合成皮革を得るために、より写像性が高く、ピット欠陥が少ない工程紙が求められている。加えて、工程紙の生産性を向上させることも求められている。
しかしながら、従来の塗工紙は、これらの要求を満足するには至っていない。
Since such process paper uses vinyl chloride, urethane, etc., it is desirable to have excellent solvent resistance. For example, it contains a styrene / butadiene copolymer latex having a gel content of 85% or more as an adhesive. Cast coated paper (for example, see Patent Document 1), a plate-shaped pigment having a volume distribution average particle diameter of 3 to 20 μm, and a base paper for release paper containing a synthetic resin latex having a gel content of 85% or more (See, for example, cited document 2).
On the other hand, in recent years, for the purpose of reducing environmental impact, the solvent used is shifting from nonpolar solvents to polar solvents, and process papers are required to have resistance to both polar and nonpolar solvents. Yes. In addition, the requirements regarding solvent resistance are becoming stricter, and it is not said that the coating layer is difficult to peel off even if it is repeatedly used, and high quality such that image clarity and glossiness are not easily lowered is required. It has become. In particular, in the field of synthetic leather processed paper, in order to obtain synthetic leather having a higher quality and a good appearance, processed paper having higher image clarity and less pit defects is required. In addition, it is required to improve the productivity of process paper.
However, the conventional coated paper does not satisfy these requirements.
本発明が解決しようとする主たる課題は、極性溶剤及び非極性溶剤の両方に対して、優れた耐溶剤性を発揮し、見栄えの良い合成皮革を得ることができる合成皮革工程紙用の塗工紙を提供することにある。更には、写像性が高く、ピット欠陥が少ない合成皮革工程紙として利用可能な塗工紙を、従来より生産性良く製造する技術を提示することにある。 The main problem to be solved by the present invention is a coating for synthetic leather process paper that exhibits excellent solvent resistance against both polar solvents and non-polar solvents, and can obtain a good-looking synthetic leather To provide paper. Furthermore, another object is to provide a technique for producing a coated paper that can be used as a synthetic leather process paper having high image clarity and few pit defects.
この課題を解決した本発明は、基紙と、基紙上に設けられた塗工層とからなる塗工紙であって、前記塗工層は顔料と接着剤を主成分とし、前記接着剤としてカゼイン、スチレン−ブタジエンラテックス、及び、次のＡ及びＢの２種類の樹脂成分を含有することを特徴とする塗工紙である。
Ａ：ポリアクリル酸系樹脂成分
Ｂ：ポリビニルアルコール系樹脂成分
The present invention that has solved this problem is a coated paper comprising a base paper and a coating layer provided on the base paper, wherein the coating layer is mainly composed of a pigment and an adhesive, and is used as the adhesive. A coated paper comprising casein, styrene-butadiene latex, and the following two types of resin components A and B.
A: Polyacrylic acid resin component B: Polyvinyl alcohol resin component
本発明では、前記Ａがポリアクリル酸樹脂成分であり、前記Ｂがポリビニルアルコール樹脂成分であることが好ましい。 In the present invention, it is preferable that A is a polyacrylic acid resin component and B is a polyvinyl alcohol resin component.
本発明では、前記Ａ及びＢとしてポリアクリル酸−ポリビニルアルコール共重合体を含有することが好ましい。 In the present invention, it is preferable that A and B contain a polyacrylic acid-polyvinyl alcohol copolymer.
本発明では、前記Ａ及びＢの割合が、質量割合で１０：９０〜９０：１０であることが好ましい。 In the present invention, the ratio of A and B is preferably 10:90 to 90:10 by mass ratio.
本発明では、前記カゼインに対する前記スチレン−ブタジエンラテックスの質量割合が、カゼイン１に対して０．６〜７．０であることがより好ましい。
本発明では、前記顔料がカオリンクレー及び炭酸カルシウムであることが好ましい。
In the present invention, the mass ratio of the styrene-butadiene latex to the casein is more preferably 0.6 to 7.0 with respect to casein 1.
In the present invention, the pigment is preferably kaolin clay and calcium carbonate.
本発明によると、極性溶剤及び非極性溶剤の両方に対して、優れた耐溶剤性を発揮する合成皮革工程紙用の塗工紙となる。また、写像性が高く、ピット欠陥が少ない合成皮革工程紙として利用可能な塗工紙を、従来より生産性良く製造できる。 According to the present invention, it is a coated paper for synthetic leather process paper that exhibits excellent solvent resistance against both polar and nonpolar solvents. Also, coated paper that can be used as synthetic leather processed paper with high image clarity and fewer pit defects can be produced with higher productivity than before.
次に、本発明の実施の形態を説明する。
まず、本発明者らは、塗工紙が示す、極性溶剤に対する耐性を向上させる目的で鋭意研究を重ねた結果、塗工層にポリアクリル酸系樹脂成分及びポリビニルアルコール系樹脂成分を含む接着剤を含有させることが有効であることを知見した。
すなわち、本発明者らは、基紙と、基紙上に設けられた塗工層とからなる塗工紙であって、前記塗工層は顔料と接着剤を主成分とし、前記接着剤としてカゼイン、スチレン−ブタジエンラテックス、及び、次のＡ及びＢの２種類の樹脂成分を含有することで、優れた耐溶剤性が発揮されることを知見し、本発明を完成するに至った。
Ａ：ポリアクリル酸系樹脂成分
Ｂ：ポリビニルアルコール系樹脂成分
ここで、ポリアクリル酸系樹脂成分とは、アクリル酸のみが重合してなる樹脂成分、すなわちポリアクリル酸樹脂成分であってもよいし、アクリル酸と他のビニルモノマーを共重合してなる樹脂成分であってもよい。好ましくはポリアクリル酸樹脂成分である。また、ポリビニルアルコール系樹脂成分とは、ビニルアルコールのみが重合してなる樹脂成分、すなわちポリビニルアルコール樹脂成分であってもよいし、ビニルアルコールと他のビニルモノマーを共重合してなる樹脂成分であってもよい。好ましくはポリビニルアルコール樹脂成分である。
すなわち本発明では、接着剤としてポリアクリル酸系樹脂成分とポリビニルアルコール系樹脂成分の双方を含有することが必須である。ポリアクリル酸系樹脂成分及びポリビニルアルコール系樹脂成分のいずれか一方又は双方を含有しない場合は、極性溶剤及び非極性溶剤に対する耐性が低く、塗工面が極性溶剤及び非極性溶剤に侵食され易くなる。特に合成皮革工程紙として使用する場合は、繰り返し使用に耐えないものとなる。ポリアクリル酸系樹脂成分とポリビニルアルコール系樹脂成分は、それぞれ個別の成分として配合してもよいが、両者が結合した成分、すなわちポリアクリル酸−ポリビニルアルコール共重合体として配合してもよい。ポリアクリル酸−ポリビニルアルコール共重合体として配合するほうが耐溶剤性の観点から好ましい。
Next, an embodiment of the present invention will be described.
First, the present inventors have conducted extensive research for the purpose of improving the resistance to polar solvents exhibited by coated paper, and as a result, an adhesive containing a polyacrylic acid resin component and a polyvinyl alcohol resin component in the coating layer. It has been found that it is effective to contain.
That is, the present inventors are coated paper comprising a base paper and a coating layer provided on the base paper, wherein the coating layer is mainly composed of a pigment and an adhesive, and casein as the adhesive. It was found that excellent solvent resistance was exhibited by containing two types of resin components, styrene-butadiene latex and the following A and B, and the present invention was completed.
A: Polyacrylic acid resin component B: Polyvinyl alcohol resin component Here, the polyacrylic resin component may be a resin component obtained by polymerization of only acrylic acid, that is, a polyacrylic resin component. Further, it may be a resin component obtained by copolymerizing acrylic acid and another vinyl monomer. A polyacrylic acid resin component is preferred. The polyvinyl alcohol resin component may be a resin component obtained by polymerizing only vinyl alcohol, that is, a polyvinyl alcohol resin component, or a resin component obtained by copolymerizing vinyl alcohol and another vinyl monomer. May be. A polyvinyl alcohol resin component is preferred.
That is, in the present invention, it is essential to contain both a polyacrylic acid resin component and a polyvinyl alcohol resin component as an adhesive. When either or both of the polyacrylic acid resin component and the polyvinyl alcohol resin component are not contained, the resistance to the polar solvent and the nonpolar solvent is low, and the coated surface is easily eroded by the polar solvent and the nonpolar solvent. In particular, when used as a synthetic leather process paper, it cannot withstand repeated use. The polyacrylic acid-based resin component and the polyvinyl alcohol-based resin component may be blended as individual components, but may be blended as a combined component, that is, a polyacrylic acid-polyvinyl alcohol copolymer. It is more preferable to mix as a polyacrylic acid-polyvinyl alcohol copolymer from the viewpoint of solvent resistance.
ポリアクリル酸系樹脂成分とポリビニルアルコール系樹脂成分との割合は、質量割合で規定することができ、好ましくはＰＡＡ系樹脂成分：ＰＶＡ系樹脂成分＝１０：９０〜９０：１０であり、より好ましくはＰＡＡ系樹脂成分：ＰＶＡ系樹脂成分＝１５：８５〜８５：１５である。ＰＡＡ系樹脂成分が１０質量％未満では、ＰＡＡ系樹脂成分そのものの性質（硬質樹脂であり、室温で剛性を有する、耐水性と接着強度に優れる性質）が発現されにくく、また、９０質量％を超過すると、ＰＶＡ系樹脂成分が少なくなり、ＰＶＡ系樹脂成分の性質（軟質樹脂であり、室温で柔軟性を有する、耐水性と接着強度に優れる性質）が発現され難くなる。ＰＡＡ系樹脂成分とＰＶＡ系樹脂成分の双方を配合することで耐溶剤性が向上する理由は不明だが、いずれも耐水性を有する硬質樹脂と軟質樹脂とを組み合わせて、室温において、塗工紙表面に柔軟性と剛性の双方を付与することで、メチルエチルケトン（ＭＥＫ）を始めとする極性溶剤及びトルエンを始めとする非極性溶剤に対する耐性が向上すると考えられる。 The ratio of the polyacrylic acid resin component and the polyvinyl alcohol resin component can be defined by mass ratio, preferably PAA resin component: PVA resin component = 10: 90 to 90:10, more preferably. Is PAA resin component: PVA resin component = 15: 85 to 85:15. When the PAA-based resin component is less than 10% by mass, the properties of the PAA-based resin component itself (hard resin, rigid at room temperature, excellent water resistance and adhesive strength) are hardly expressed, and 90% by mass When it exceeds, the PVA-based resin component is reduced, and the properties of the PVA-based resin component (a soft resin that has flexibility at room temperature and excellent water resistance and adhesive strength) are hardly expressed. The reason why the solvent resistance is improved by blending both the PAA resin component and the PVA resin component is unknown, but in both cases, the surface of the coated paper is combined with a water-resistant hard resin and a soft resin at room temperature. By imparting both flexibility and rigidity, it is considered that resistance to polar solvents such as methyl ethyl ketone (MEK) and nonpolar solvents such as toluene is improved.
以上の本形態に必須の接着剤Ａ及びＢの合計配合量は、顔料１００質量部に対して、好ましくは１〜１０質量部、より好ましくは２〜５質量部である。１質量部未満では、耐溶剤性の効果が十分に発現せず耐溶剤性に劣り、１０質量部を超過すると、顔料由来の平滑性に劣り、写像性が低下して見栄えが悪化するだけでなく、平滑性の低い部分に極性溶剤が溜まりやすく、局所的に侵食が進みやすくなり、耐溶剤性が低下しやすいため好ましくない。 The total blending amount of the adhesives A and B essential for the above embodiment is preferably 1 to 10 parts by mass, more preferably 2 to 5 parts by mass with respect to 100 parts by mass of the pigment. If the amount is less than 1 part by mass, the solvent resistance effect is not sufficiently exhibited and the solvent resistance is inferior. If the amount exceeds 10 parts by mass, the smoothness derived from the pigment is inferior, the image clarity is deteriorated, and the appearance is deteriorated. In addition, the polar solvent tends to accumulate in a portion having low smoothness, erosion tends to proceed locally, and the solvent resistance tends to decrease, which is not preferable.
接着剤として上記Ａ及びＢの２成分と共に、カゼイン及びスチレン−ブタジエンラテックスを併用する必要があり、これにより耐溶剤性及び写像性を格段に向上できる。特に塗工後にキャスト処理を行うキャスト塗工紙においては、塗工層表面の写像性向上効果が得られやすいカゼインを用いると、剥離性向上効果による写像性の向上効果が得られる。特に表面性が重要となる合成皮革工程紙用途では、カゼインを用いることが特に好ましい。
カゼインの配合量は、顔料１００質量部に対して５〜２５質量部とすることが好ましく、１０〜２０質量部とすることがより好ましい。５質量部未満では、剥離性が低下し、塗工面の一部がキャストドラムに付着するトラブルが発生しやすくなり、例えばキャスト処理における速度を６０ｍ／分程度の高速で処理した場合に、剥離性が悪く平滑性に劣り、写像性が悪化する。他方、２５質量部を超過すると剥離性能が頭打ちとなり、高価なカゼインを大量使用する意味がなく経済性に劣るだけでなく、キャスト処理を行った場合にキャストドラムに塗工層が密着せず平滑性に劣るため、写像性が低下しやすいため好ましくない。
特に、特に上記Ａ及びＢが共重合されている共重合体とカゼインを併用すると、均一な剥離性が得られるため、写像性が高い塗工紙が得られるため特に好ましい。
It is necessary to use casein and styrene-butadiene latex together with the above two components A and B as an adhesive, which can significantly improve solvent resistance and image clarity. In particular, in the case of cast coated paper that is subjected to a cast treatment after coating, use of casein that is easy to obtain the effect of improving the image clarity of the coating layer surface provides an effect of improving the image clarity due to the effect of improving the peelability. Casein is particularly preferred for use in synthetic leather process papers where surface properties are particularly important.
The blending amount of casein is preferably 5 to 25 parts by mass, more preferably 10 to 20 parts by mass with respect to 100 parts by mass of the pigment. If it is less than 5 parts by mass, the releasability is lowered, and a trouble that a part of the coating surface adheres to the cast drum is likely to occur. For example, when the speed in the casting process is about 60 m / min, the releasability is reduced. Is inferior in smoothness and poor in image clarity. On the other hand, if it exceeds 25 parts by mass, the peeling performance will reach its peak, and there is no meaning to use a large amount of expensive casein and it is inferior in economic efficiency. It is not preferable because the inferior property tends to deteriorate the image clarity.
In particular, it is particularly preferable to use casein together with a copolymer in which A and B are copolymerized, since uniform peelability can be obtained and a coated paper with high image clarity can be obtained.
スチレン−ブタジエンラテックス（ＳＢＲ）は、顔料１００質量部に対し１０質量部〜４０質量部配合することが好ましく、１５〜３５質量部配合することがより好ましい。１０質量部未満では十分な接着力が発現せず、逆に、４０質量部を超えてもフィルム状の表面が形成され、顔料由来の写像性が低下し、いずれも耐溶剤性が低下するため好ましくない。
上述のポリアクリル酸系樹脂成分及びポリビニルアルコール系樹脂成分と共に、カゼイン及びＳＢＲを含有する接着剤を用いると、ポリアクリル酸樹脂成分及びポリビニルアルコール樹脂成分を有する接着剤も成膜性を有するため、より写像性の高い塗工紙が得られる。
カゼインを配合すると、得られる塗工紙の写像性が高くなる一方、均一な塗工が得られ難く、耐溶剤性に劣る傾向にある。そのため、ＳＢＲと併用することで、耐溶剤性を向上させつつ、写像性が良好な塗工紙が得られる。カゼイン及びＳＢＲの質量割合は、カゼイン１に対してＳＢＲ０．６〜７．０が好ましく、１．０〜３．０がより好ましい。０．６を下回ると均一な塗工が得られにくく耐溶剤性に劣り、７．０を超過すると剥離性が向上しすぎてドラムに塗工層が密着せず、写像性が低下するため好ましくない。
また、本件発明に必須の接着剤の配合量合計は、顔料１００質量部に対して、好ましくは１６〜７５質量部である。１６質量部未満では、耐溶剤性や剥離性、写像性に劣り、他方、７５質量部を超えても写像性が低下するうえに、経済性に劣る。
本形態においては、以上の接着剤以外にも、耐溶剤性を阻害しない範囲で、塗工紙製造で一般的に用いられる接着剤を併用することができる。具体的には、例えば、大豆蛋白等の蛋白質類；メチルメタクリレート−ブタジエン共重合体ラテックス、スチレン−メチルメタクリレート−ブタジエン共重合体ラテックス等の共役ジエン系ラテックス；アクリル酸エステル及び／又はメタクリル酸エステルの重合体ラテックス若しくは共重合体ラテックス等のアクリル系ラテックス；エチレン−酢酸ビニル重合体ラテックス等のビニル系ラテックス；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又は非溶解性のラテックス等のラテックス類；オレフィン−無水マレイン酸樹脂、メラミン樹脂、尿素樹脂、ウレタン樹脂等の合成樹脂系接着剤；酸化澱粉、陽性化澱粉、エステル化澱粉、デキストリン等の澱粉類；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を挙げることができ、これらの中から１種又は２種以上を適宜選択して使用することができる。
The styrene-butadiene latex (SBR) is preferably blended in an amount of 10 to 40 parts by weight and more preferably 15 to 35 parts by weight with respect to 100 parts by weight of the pigment. If the amount is less than 10 parts by mass, sufficient adhesive strength is not exhibited. Conversely, if the amount exceeds 40 parts by mass, a film-like surface is formed, and the image clarity derived from the pigment is lowered. It is not preferable.
When an adhesive containing casein and SBR is used together with the polyacrylic acid resin component and the polyvinyl alcohol resin component described above, the adhesive having the polyacrylic acid resin component and the polyvinyl alcohol resin component also has film-forming properties. A coated paper with higher image clarity can be obtained.
When casein is blended, the resulting coated paper has high image clarity, while it is difficult to obtain a uniform coating and the solvent resistance tends to be poor. Therefore, by using together with SBR, a coated paper with good image clarity can be obtained while improving the solvent resistance. SBR 0.6-7.0 is preferable with respect to casein 1, and, as for the mass ratio of casein and SBR, 1.0-3.0 is more preferable. If it is less than 0.6, uniform coating is difficult to obtain and the solvent resistance is poor, and if it exceeds 7.0, the peelability is improved so that the coating layer does not adhere to the drum, and the image clarity is reduced. Absent.
Moreover, the total amount of the adhesive essential to the present invention is preferably 16 to 75 parts by mass with respect to 100 parts by mass of the pigment. If the amount is less than 16 parts by mass, the solvent resistance, peelability, and image clarity are inferior. On the other hand, if it exceeds 75 parts by mass, the image clarity is lowered and the economy is inferior.
In this embodiment, in addition to the above-mentioned adhesives, adhesives generally used in coated paper production can be used in combination as long as solvent resistance is not impaired. Specifically, for example, proteins such as soybean protein; conjugated diene latex such as methyl methacrylate-butadiene copolymer latex and styrene-methyl methacrylate-butadiene copolymer latex; acrylic ester and / or methacrylate ester Acrylic latex such as polymer latex or copolymer latex; Vinyl latex such as ethylene-vinyl acetate polymer latex; Alkaline moiety obtained by modifying these various copolymer latexes with functional group-containing monomers such as carboxyl groups Latexes such as soluble or non-soluble latex; synthetic resin adhesives such as olefin-maleic anhydride resin, melamine resin, urea resin, urethane resin; oxidized starch, positive starch, esterified starch, dextrin, etc. Starch; Carboxymethyl Loin, cellulose derivatives such as hydroxyethyl cellulose or the like can be cited, and may be used by selecting one or more from among these as appropriate.
塗工層に使用する顔料は特に限定されないが、例えば、カオリンクレー（デラミネーテッドカオリン、焼成カオリン、構造化カオリン等も含む）、タルク、軽質炭酸カルシウム、重質炭酸カルシウム、サチンホワイト、亜硫酸カルシウム、石膏、硫酸バリウム、ホワイトカーボン、、珪藻土、炭酸マグネシウム、二酸化チタン、水酸化アルミニウム、水酸化カルシウム、シリカ、水酸化マグネシウム、水酸化亜鉛、酸化亜鉛、酸化マグネシウム、ベントナイト、セリサイト等の無機顔料や、ポリスチレン樹脂微粒子、尿素ホルマリン樹脂微粒子、微小中空粒子、多孔質微粒子等の有機顔料等の中から、１種又は２種以上を適宜選択して使用することができる。
上記顔料の中でも、吸油性の低い炭酸カルシウムやカオリンクレーを用いると、耐溶剤性に優れた塗工紙を得ることができるため好ましい。合成非晶質シリカやコロイダルシリカ等の比表面積の大きい顔料を用いると、吸油性が高く耐溶剤性に劣るため好ましくない。
The pigment used in the coating layer is not particularly limited. For example, kaolin clay (including delaminated kaolin, calcined kaolin, structured kaolin, etc.), talc, light calcium carbonate, heavy calcium carbonate, satin white, calcium sulfite , Gypsum, barium sulfate, white carbon, diatomaceous earth, magnesium carbonate, titanium dioxide, aluminum hydroxide, calcium hydroxide, silica, magnesium hydroxide, zinc hydroxide, zinc oxide, magnesium oxide, bentonite, sericite, etc. Alternatively, one or more kinds of organic pigments such as polystyrene resin fine particles, urea formalin resin fine particles, fine hollow particles, and porous fine particles can be appropriately selected and used.
Among the above pigments, it is preferable to use calcium carbonate or kaolin clay having low oil absorption because a coated paper excellent in solvent resistance can be obtained. Use of a pigment having a large specific surface area such as synthetic amorphous silica or colloidal silica is not preferable because of high oil absorption and poor solvent resistance.
炭酸カルシウムとしては、不定形状の重質炭酸カルシウムや、紡錘状、柱状又は立方状等の軽質炭酸カルシウムが挙げられるが、この中でも柱状又は立方状の軽質炭酸カルシウムを用いると、塗工層中の空隙が大きく透気性が高くなり、写像性に優れた塗工紙が得られるため好ましい。特にキャスト処理を行い写像性を向上させる場合、塗工層が乾燥するに従って塗工層中の水分が水蒸気となって揮散するが、塗工層はキャストドラムに密着した状態のため、水蒸気は塗工層の裏面から蒸発する。塗工紙の通気性が低い場合、水蒸気が裏面から抜け難く、塗工層とキャストドラムとの間に溜まり、キャスト面を充分に塗工層に写し取れず、写像性に劣る塗工紙となる。このため、塗工層は通気性に優れることが好ましく、通気性を付与できる顔料である柱状又は立方状の軽質炭酸カルシウムを顔料として使用することが好ましい。
炭酸カルシウムの配合量は、顔料１００質量部に対して、１０〜９０質量部が好ましく、２０〜８０質量部がより好ましい。配合量が１０質量部未満では充分な透気性が得られ難く、写像性に劣るだけでなく、微細な塗工ムラであるピット欠陥が発生しやすいため好ましくない。他方、９０質量部を超過すると、塗工液の流動性が悪化して塗工時のプロファイルが悪化し、塗工ムラに起因する耐溶剤性の低下が発生しやすくなるため好ましくない。
上記の塗工紙は、Ｔａｐｐｉ Ｔ５３６ｃｍ−０２に基づいて測定した透気度が１，０００〜３０，０００秒、好ましくは立方状又は柱状の軽質炭酸カルシウムを使用することで１，０００〜２０，０００秒、より好ましくは１，０００〜１０，０００秒となるため、ピット欠陥が発生しにくく写像性に優れ、極性溶剤接触後の写像性の低下が少ない、耐溶剤性に優れた塗工紙、特には、合成皮革工程紙となる。更にこの塗工紙に平坦化処理を施すことで、更に写像性に優れた塗工紙となる。これらの平坦化は、一般に製紙用途で使用できる平坦化設備で行なえば足り、例えばスーパーカレンダーやソフトカレンダー等を用い、線圧や速度等により調整することができる。
透気度が３０，０００秒を超過すると、これ以上の平坦化を行っても耐溶剤性が頭打ちになるだけで、経済的に好ましくない。スーパーカレンダーで平滑性を調整する場合においても、線圧が過大となるために紙の持つ剛性が破壊される可能性がある。透気度が１，０００秒未満では、塗工面の空隙が多く、溶媒が浸透し易いため、耐溶剤性が低下しやすい。
Examples of calcium carbonate include irregular-shaped heavy calcium carbonate and light calcium carbonates such as spindles, columns, or cubes. Among these, when columnar or cubic light calcium carbonates are used, This is preferable because a coated paper having a large void and high air permeability and excellent image clarity can be obtained. In particular, when the cast process is performed to improve the image clarity, the moisture in the coating layer volatilizes as water vapor as the coating layer dries. However, since the coating layer is in close contact with the cast drum, water vapor is not applied. Evaporates from the back of the work layer. When the air permeability of the coated paper is low, it is difficult for water vapor to escape from the back side, and it accumulates between the coating layer and the cast drum, and the cast surface cannot be sufficiently copied to the coating layer, and the coated paper has poor image clarity. Become. For this reason, it is preferable that a coating layer is excellent in air permeability, and it is preferable to use the columnar or cubic light calcium carbonate which is a pigment which can provide air permeability as a pigment.
10-90 mass parts is preferable with respect to 100 mass parts of pigments, and, as for the compounding quantity of calcium carbonate, 20-80 mass parts is more preferable. When the blending amount is less than 10 parts by mass, it is difficult to obtain sufficient air permeability, not only inferior in image clarity, but also pit defects, which are fine coating unevenness, are not preferred. On the other hand, when the amount exceeds 90 parts by mass, the fluidity of the coating liquid is deteriorated, the profile at the time of coating is deteriorated, and the solvent resistance is easily lowered due to uneven coating, which is not preferable.
The coated paper has an air permeability measured based on Tappi T536cm-02 of 1,000 to 30,000 seconds, preferably 1,000 to 20, using cubic or columnar light calcium carbonate. 000 seconds, more preferably 1,000 to 10,000 seconds, so that the coated paper is excellent in solvent resistance because it is less prone to pit defects and has excellent image clarity and little deterioration in image clarity after contact with a polar solvent. Especially, it becomes synthetic leather process paper. Furthermore, by applying a flattening process to the coated paper, the coated paper is further excellent in image clarity. Such flattening is generally performed by a flattening facility that can be used for papermaking. For example, a supercalender, a soft calender, or the like can be used, and can be adjusted by linear pressure, speed, or the like.
If the air permeability exceeds 30,000 seconds, even if flattening beyond this, the solvent resistance only reaches its peak, which is not economically preferable. Even when the smoothness is adjusted by the super calendar, the linear pressure may be excessive, and the rigidity of the paper may be destroyed. When the air permeability is less than 1,000 seconds, there are many voids on the coated surface, and the solvent easily penetrates, so that the solvent resistance is likely to deteriorate.
カオリンクレーは板状の顔料であり、塗工層表面で均一な方向に配向しやすく、塗工層表面の平滑性及び写像性を向上できるため好ましいが、流動性が炭酸カルシウムに比べて悪く塗工ムラが発生しやすいため、上述したとおりポリアクリル酸樹脂成分及びポリビニルアルコール樹脂成分を含有する接着剤を使用することで、耐溶剤性及び写像性を向上できるため好ましい。カオリンクレーの配合量は、顔料１００質量部に対して、１０〜９０質量部が好ましく、２０質量部〜８０質量部がより好ましい。配合量が１０質量部未満では写像性及び平滑性が劣るため耐溶剤性が低下しやすく、他方、９０質量部を超過すると、塗工液の流動性が悪化して塗工時のプロファイルが悪化し、塗工ムラに起因する耐溶剤性の低下が発生しやすくなるため好ましくない。
上述のごとく、顔料として柱状又は立方状の軽質炭酸カルシウムを使用することで写像性の良好な塗工紙を得られるだけでなく、さらにカオリンクレーを併用することで、より写像性の良好な塗工紙が得られるため好ましい。
特にポリアクリル酸樹脂成分及びポリビニルアルコール樹脂成分を含有する接着剤とカゼインとＳＢＲを併用する場合において、顔料としてカオリンクレーを用いると写像性及び耐溶剤性の双方を向上できるため、更に好ましい。
上述のとおり、顔料として柱状又は立方状の軽質炭酸カルシウム及びカオリンクレーを併用し、接着剤としてポリアクリル酸樹脂成分、ポリビニルアルコール樹脂成分、カゼイン及びＳＢＲを併用すると、写像性及び耐溶剤性に特に優れた塗工紙を得ることができる。この形態においては、カゼイン由来の剥離性が塗工層表面において均一となるため、写像性が８５％以上と優れた塗工紙が得られる。このため、キャスト法を用いた場合、従来は処理速度が３０ｍ／分であったものが、本発明においては６０ｍ／分と高い製造速度においても写像性及び耐溶剤性に優れる塗工紙が得られるため、生産性を充分に向上できる効果が得られる。
Kaolin clay is a plate-like pigment, which is preferable because it can be easily oriented in a uniform direction on the surface of the coating layer and can improve the smoothness and image clarity of the surface of the coating layer, but it has poor fluidity compared to calcium carbonate. Since unevenness of work is likely to occur, it is preferable to use an adhesive containing a polyacrylic acid resin component and a polyvinyl alcohol resin component as described above, because the solvent resistance and image clarity can be improved. 10-90 mass parts is preferable with respect to 100 mass parts of pigments, and, as for the compounding quantity of kaolin clay, 20 mass parts-80 mass parts is more preferable. If the blending amount is less than 10 parts by mass, the image resistance and smoothness are inferior, so that the solvent resistance is liable to decrease. On the other hand, if it exceeds 90 parts by mass, the fluidity of the coating liquid deteriorates and the profile at the time of coating deteriorates. However, it is not preferable because the solvent resistance is likely to deteriorate due to uneven coating.
As described above, by using columnar or cubic light calcium carbonate as a pigment, it is possible not only to obtain coated paper with good image clarity, but also by using kaolin clay together, it is possible to apply paint with better image clarity. It is preferable because a working paper is obtained.
In particular, in the case of using an adhesive containing a polyacrylic acid resin component and a polyvinyl alcohol resin component together with casein and SBR, it is more preferable to use kaolin clay as a pigment because both the image clarity and the solvent resistance can be improved.
As described above, columnar or cubic light calcium carbonate and kaolin clay are used in combination as a pigment, and polyacrylic acid resin component, polyvinyl alcohol resin component, casein and SBR are used in combination as an adhesive, particularly in image clarity and solvent resistance. Excellent coated paper can be obtained. In this form, the peelability derived from casein becomes uniform on the surface of the coating layer, so that a coated paper having an image clarity of 85% or more can be obtained. For this reason, when the casting method is used, a coating paper having a processing speed of 30 m / min in the past and a coated paper excellent in image clarity and solvent resistance can be obtained even at a high production speed of 60 m / min in the present invention. Therefore, the effect of sufficiently improving productivity can be obtained.
本形態の塗工剤には、顔料、接着剤の他にも、例えば、蛍光増白剤、蛍光増白剤の被染着物質、消泡剤、離型剤、着色剤、保水剤等の通常使用される各種助剤を適宜配合することもできる。 In addition to pigments and adhesives, the coating agent of the present embodiment includes, for example, fluorescent whitening agents, fluorescent whitening agent dyed substances, antifoaming agents, mold release agents, coloring agents, water retention agents, etc. Various auxiliary agents that are usually used can be appropriately blended.
基紙の表面への塗工剤の塗工は、一般の塗工紙用途設備で行えば足り、例えば、ブレードコーター、エアーナイフコーター、トランスファーロールコーター、ロッドメタリングサイズプレスコーター、カーテンコーター等の塗工装置を設けたオンマシンコーター又はオフマシンコーターによって、基紙上に一層又は多層に分けて塗工剤を塗工できる。中でも高濃度塗料を均一に塗工でき、塗工層表面の高い平坦性が確保されるという点から、エアーナイフコーターを用いることが好ましい。また、ドライヤーパートでの乾燥方法としては、例えば、熱風加熱、ガスヒーター加熱、赤外線ヒーター加熱等の各種加熱乾燥方式を適宜採用することができる。 Application of the coating agent to the surface of the base paper is sufficient if it is performed by general application paper application equipment, for example, blade coater, air knife coater, transfer roll coater, rod metering size press coater, curtain coater, etc. An on-machine coater or an off-machine coater provided with a coating apparatus can be used to coat the coating agent in a single layer or multiple layers on the base paper. Among these, it is preferable to use an air knife coater from the viewpoint that a high-concentration paint can be applied uniformly and high flatness of the coating layer surface is ensured. Moreover, as a drying method in the dryer part, for example, various heating drying methods such as hot air heating, gas heater heating, infrared heater heating and the like can be appropriately employed.
前記塗工後の表面仕上げは、合成皮革工程紙用途では、いわゆるキャストコート法によることが好ましい。キャストコート法は、一般に、（１）塗工層が湿潤状態にある間に、鏡面仕上げした加熱ドラムに圧着（圧接）して乾燥するウェットキャスト法（直接法）、（２）湿潤状態の塗工層を一旦（半）乾燥した後に再湿潤液により膨潤可塑化（湿潤）させて、鏡面仕上げした加熱ドラムに圧着し乾燥するリウェットキャスト法（再湿潤法）、（３）湿潤状態の塗工層を凝固液等の凝固処理によりゲル状態にして、鏡面仕上げした加熱ドラムに圧着し乾燥するゲル化キャスト法（凝固法）の３種類に分けることができ、いずれの方法でも耐溶剤性を得られるが、本形態では、リウェットキャスト法が生産性の面から好ましい。ゲル化キャスト法では、塗工層がキャストドラムから剥離しにくくなり、例えばキャスト処理速度を６０ｍ／分と高速処理を行った際に、写像性及び耐溶剤性が低下しやすくなるため好ましくない。 The surface finish after the coating is preferably carried out by a so-called cast coating method for synthetic leather process paper. In general, the cast coating method includes (1) a wet casting method (direct method) in which a coating layer is in a wet state and is dried by pressure bonding (pressure contact) to a mirror-finished heating drum, and (2) a wet coating method. Re-wet casting method (re-wetting method) in which the work layer is once (semi-) dried and then swelled and plasticized (wet) with a re-wetting liquid, and then pressed onto a mirror-finished heating drum (drying method). (3) Wet coating The layer can be divided into three types: gelation cast method (coagulation method), which is made into a gel state by coagulation treatment with a coagulation liquid and then pressed onto a mirror-finished heating drum and dried. However, in this embodiment, the rewet cast method is preferable from the viewpoint of productivity. The gelled casting method is not preferable because the coating layer is difficult to peel off from the cast drum. For example, when high-speed processing is performed at a casting processing speed of 60 m / min, image clarity and solvent resistance tend to decrease.
塗工量は２〜３０ｇ／ｍ２が好ましい。２ｇ／ｍ２未満では基紙の被覆性が低下し、良好な写像性、耐溶剤性が得られない。３０ｇ／ｍ２を超過すると、塗工層が乾燥する際に発生する水蒸気が増加し、キャストコート法ではピット欠陥が発生しやすくなり、品質が低下するだけでなく経済性も悪化する。 The coating amount is preferably 2 to 30 g / m 2 . If it is less than 2 g / m 2 , the covering property of the base paper is lowered, and good image clarity and solvent resistance cannot be obtained. When it exceeds 30 g / m 2 , the water vapor generated when the coating layer is dried increases, and the pit defects are likely to occur in the cast coating method, not only the quality is deteriorated but also the economical efficiency is deteriorated.
上記のとおり製造したキャスト塗工紙を合成皮革工程紙として用いる場合は、写像性が８５％以上、更には８７％以上、特に８９％以上であれば、平滑性と光沢性に優れた合成皮革を製造することができるため好ましい。 When the cast coated paper produced as described above is used as a synthetic leather process paper, if the image clarity is 85% or more, further 87% or more, especially 89% or more, the synthetic leather is excellent in smoothness and gloss. Is preferable because it can be manufactured.
また、本形態の塗工紙は、次記処理を行ったときのＪＩＳ Ｈ ８６８６−２に基づいて測定した写像性の低下率が２０％以下であるのが好ましく、１５％以下であるのがより好ましく、更には１０％以下とするのが好ましい。特に合成皮革工程紙においては、写像性の低下が小さいほど、製造する合成皮革の鏡面性の低下が少なく、見栄えの良い合成皮革が得られるため、上記範囲内とすることが好ましい。また、溶剤による劣化が起こり難いことから、トラレなどの欠陥発生が低減でき、剥離性が良好なため効率的に合成皮革の製造ができるなど、繰り返し使用に耐え得る工程紙となる。他に、紙袋やブックカバー用途においても、汗や風雨による品質劣化が少ない、耐水性に優れた塗工紙となる。 The coated paper of this embodiment preferably has a reduction rate of image clarity measured based on JIS H 8686-2 of 20% or less, and 15% or less when the following processing is performed. More preferably, it is preferably 10% or less. In particular, in the synthetic leather processed paper, the smaller the reduction in image clarity, the less the reduction in mirror surface properties of the synthetic leather to be produced, and the better-looking synthetic leather can be obtained. Further, since the deterioration due to the solvent is difficult to occur, the generation of defects such as a tray can be reduced, and the synthetic leather can be efficiently manufactured due to the good releasability. Thus, the process paper can withstand repeated use. In addition, for paper bags and book covers, the coated paper has excellent water resistance with little quality deterioration due to sweat and wind and rain.
（処理）
前記塗工層表面にメチルエチルケトンをＮｏ．２のワイヤーバーで塗工し、３０秒経過してから１３０℃で９０秒間加熱する。
(processing)
On the surface of the coating layer, methyl ethyl ketone was No. 2. Coat with wire bar 2 and heat at 130 ° C. for 90 seconds after 30 seconds.
一方、塗工紙の基紙は、通常の原料パルプを使用することができ、例えば、未晒針葉樹パルプ（ＮＵＫＰ）、未晒広葉樹パルプ（ＬＵＫＰ）、晒針葉樹パルプ（ＮＢＫＰ）、晒広葉樹パルプ（ＬＢＫＰ）等の化学パルプ；ストーングランドパルプ（ＳＧＰ）、加圧ストーングランドパルプ（ＰＧＷ）、リファイナーグランドパルプ（ＲＧＰ）、ケミグランドパルプ（ＣＧＰ）、サーモグランドパルプ（ＴＧＰ）、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）、リファイナーメカニカルパルプ（ＲＭＰ）等の機械パルプ等を使用することができる。また、古紙からなる古紙パルプを使用することも可能であり、例えば、茶古紙、クラフト封筒古紙、雑誌古紙、新聞古紙、チラシ古紙、オフィス古紙、段ボール古紙、上白古紙、ケント古紙、模造古紙、地券古紙等から製造される離解古紙パルプ、離解・脱墨古紙パルプ、離解・脱墨・漂白古紙パルプ等があげられる。本発明では、これらの中から１種又は２種以上を適宜選択して使用することができる。 On the other hand, as the base paper of the coated paper, normal raw pulp can be used. For example, unbleached softwood pulp (NUKP), unbleached hardwood pulp (LUKP), bleached softwood pulp (NBKP), bleached hardwood pulp ( Chemical pulp such as LBKP; Stone Grand Pulp (SGP), Pressurized Stone Grand Pulp (PGW), Refiner Grand Pulp (RGP), Chemi Grand Pulp (CGP), Thermo Grand Pulp (TGP), Grand Pulp (GP), Mechanical pulp such as thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), refiner mechanical pulp (RMP), or the like can be used. It is also possible to use waste paper pulp made of waste paper, for example, tea waste paper, craft envelope waste paper, magazine waste paper, newspaper waste paper, flyer waste paper, office waste paper, corrugated waste paper, upper white waste paper, Kent waste paper, imitation waste paper, Examples include disaggregated waste paper pulp, disaggregated / deinked waste paper pulp, disaggregated / deinked / bleached waste paper pulp, etc., manufactured from old paper waste paper. In the present invention, one or more of these can be appropriately selected and used.
本形態においては、以上の原料パルプを混合して抄紙原料（紙料スラリー）を調製するが、当該原料パルプには、例えば、内添サイズ剤、紙力増強剤、紙厚向上剤、歩留向上剤等の通常の製紙工程で配合される種々の添加剤を、その種類及び配合量を適宜調整して内添することができる。
また、基紙を抄造する抄紙機も特に限定されず、例えば、長網方式、ツインワイヤー方式、ギャップフォーマー方式、丸網方式、ヤンキー方式など各方式を適宜用いることができる。
また、本件発明の塗工を行う前に、基紙を平坦化する目的で、前記一般の塗工紙用途設備を用いた塗工や、前記弾性ロールと金属ロールとの組み合わせによる平坦化処理を行う方が好ましい。
In the present embodiment, the above raw material pulp is mixed to prepare a papermaking raw material (stock slurry). The raw material pulp includes, for example, an internal sizing agent, a paper strength enhancer, a paper thickness improver, and a yield. Various additives blended in a normal papermaking process such as an improver can be internally added by appropriately adjusting the kind and blending amount.
Also, the paper machine for making the base paper is not particularly limited, and for example, various methods such as a long mesh method, a twin wire method, a gap former method, a round mesh method, and a Yankee method can be appropriately used.
Moreover, before performing the coating of the present invention, for the purpose of flattening the base paper, the coating using the general application paper application equipment and the flattening treatment by the combination of the elastic roll and the metal roll. It is preferable to do this.
次に、実施例を挙げて本発明による作用効果を明らかにするが、本発明はこれら実施例に限定されるものではない。 Next, although an example and an example are given and the operation effect by the present invention is clarified, the present invention is not limited to these examples.
〔基紙〕
原料として広葉樹晒クラフトパルプ１００％のパルプを使用し、フリーネスを３７０ｍｌとした。絶乾パルプ１ｔに対して、カチオン化澱粉を５ｋｇ、サイズ剤０．２ｋｇをそれぞれ有効成分基準で内添し、填料として軽質炭酸カルシウムを灰分１０％となるよう内添した。
[Base paper]
100% hardwood bleached kraft pulp was used as a raw material, and the freeness was 370 ml. 5 kg of cationized starch and 0.2 kg of a sizing agent were internally added to the absolutely dry pulp 1 t on the basis of active ingredients, respectively, and light calcium carbonate as a filler was internally added so as to have an ash content of 10%.
〔塗工層の形成〕
まず、表１に示す種類及び割合で、顔料及び接着剤を常温にて混合撹拌して塗工剤を得た。なお、用いた顔料及び接着剤は以下のとおりである。また、表１の接着剤の配合量は、顔料１００質量部に対する値である。
（顔料）
・炭酸カルシウム（重質、品番：エスカロン＃９０、三共製粉株式会社製）
・炭酸カルシウム（軽質、紡錘状、品番：ＴＰ−１２１−６Ｓ、奥多摩工業社製）
・炭酸カルシウム（軽質、立方状、品番：白艶華ＰＺ、白石カルシウム社製）
・炭酸カルシウム（軽質、柱状、品番：ＴＰ−１２３、奥多摩工業社製）
・カオリンクレー（品番：ＨＹＤＲＡＳＰＥＲＳＥ９０、ＨＵＢＥＲ社製）
（接着剤）
・カゼイン（日成共益株式会社製）
・スチレン−ブタジエンラテックス（ＳＢＲ）（品番：ＰＡ５０３６、日本エイアンドエル株式会社製）
・ポリアクリル酸−ポリビニルアルコール共重合体（ＰＡＡ−ＰＶＡ）（型番：コーガムＨＷ４００、昭和高分子株式会社製）ただし、実施例２９〜３２では、実施例１で用いたポリアクリル酸−ポリビニルアルコール共重合体のポリアクリル酸及びポリビニルアルコール含有割合のみを変更した共重合体を用いた。
・ポリアクリル酸（ＰＡＡ）（品番：アクアリックＲ ＨＬ、日本触媒株式会社製）
・ポリビニルアルコール（ＰＶＡ）（型番：ＰＶＡ４０５、株式会社クラレ製）
・ウレタン樹脂（型番：アクアプレンＷＳ−１０５、明星化学工業社製）
上記塗料を、前述した基紙に、エアーナイフコーターで片面あたり乾燥質量１２ｇ／ｍ２となるよう塗工し、毎分６０ｍの速度でリウェットキャスト法（再湿潤法）により鏡面仕上げを行った。ただし、実施例３３では鏡面仕上げをゲル化キャスト法で行った。
[Formation of coating layer]
First, a pigment and an adhesive were mixed and stirred at room temperature in the types and ratios shown in Table 1 to obtain a coating agent. The pigments and adhesives used are as follows. Moreover, the compounding quantity of the adhesive agent of Table 1 is a value with respect to 100 mass parts of pigments.
(Pigment)
・ Calcium carbonate (heavy, product number: ESCALON # 90, manufactured by Sankyo Flour Milling Co., Ltd.)
・ Calcium carbonate (light, spindle-shaped, product number: TP-121-6S, manufactured by Okutama Kogyo Co., Ltd.)
・ Calcium carbonate (light, cubic, product number: Shiraka Hana PZ, manufactured by Shiraishi Calcium)
・ Calcium carbonate (light, columnar, product number: TP-123, manufactured by Okutama Kogyo Co., Ltd.)
・ Kaolin clay (part number: HYDRASPERSE90, manufactured by HUBER)
(adhesive)
・ Casein (manufactured by Nissei Kyobun Co., Ltd.)
・ Styrene-butadiene latex (SBR) (Part No .: PA5036, manufactured by Nippon A & L Co., Ltd.)
Polyacrylic acid-polyvinyl alcohol copolymer (PAA-PVA) (model number: Cogham HW400, manufactured by Showa Polymer Co., Ltd.) However, in Examples 29 to 32, the polyacrylic acid-polyvinyl alcohol co-polymer used in Example 1 A copolymer in which only the content ratio of polyacrylic acid and polyvinyl alcohol in the polymer was changed was used.
・ Polyacrylic acid (PAA) (Part No .: Aquaric R HL, manufactured by Nippon Shokubai Co., Ltd.)
・ Polyvinyl alcohol (PVA) (model number: PVA405, manufactured by Kuraray Co., Ltd.)
・ Urethane resin (model number: Aquaprene WS-105, manufactured by Meisei Chemical Co., Ltd.)
The coating material was coated on the above-described base paper with an air knife coater so that the dry mass was 12 g / m 2 per side, and mirror-finished by a rewet cast method (rewetting method) at a rate of 60 m per minute. However, in Example 33, the mirror finish was performed by the gelled cast method.
〔比較例について〕
接着剤の成分を、表１に示すとおり変化させ、実施例と同様に製造し、比較例とした。
[Comparative example]
The components of the adhesive were changed as shown in Table 1, and were produced in the same manner as in the examples, and used as comparative examples.
〔評価方法〕
以上のようにして製造した各種塗工紙のキャスト塗工面について、以下のとおり測定・評価を行った。結果は、表１に示した。
〔Evaluation methods〕
The cast coated surfaces of various coated papers produced as described above were measured and evaluated as follows. The results are shown in Table 1.
１）透気度
Ｔａｐｐｉ Ｔ５３６ｃｍ−０２に準じて測定した。
２）ピット欠陥
ピット欠陥の発生状況を、次の基準で目視評価した。
◎：ピット欠陥の発生がなく、面感に優れ、実使用可能である。
○：ピット欠陥が僅かに発生したが、面感が良好であり、実使用可能である。
△：ピット欠陥が多少発生したが、実使用に耐え得る程度の面感を有している。
×：ピット欠陥が発生し、実使用に耐えない。
1) Air permeability Measured according to Tappi T536cm-02.
2) Pit defects The state of occurrence of pit defects was visually evaluated according to the following criteria.
A: No occurrence of pit defects, excellent surface feeling, and practical use.
◯: Slight pit defects occurred, but the surface feeling was good, and actual use was possible.
Δ: Although some pit defects occurred, the surface has a feel enough to withstand actual use.
X: A pit defect occurs and it cannot endure actual use.
３）耐溶剤性試験
前記塗工層表面にトルエンまたはメチルエチルケトン（ＭＥＫ）をＮｏ．２のワイヤーバーで塗工し、３０秒経過してから１３０℃で９０秒間加熱した。この処理を行う前後の写像性を測定した。
3) Solvent resistance test Toluene or methyl ethyl ketone (MEK) No. 3 was applied to the surface of the coating layer. The coating was performed with a wire bar No. 2, and after 30 seconds, it was heated at 130 ° C. for 90 seconds. The image clarity before and after this treatment was measured.
３−１）写像性
ＪＩＳ Ｈ ８６８６−２に準じて測定した。耐溶剤性試験前の写像性を溶剤接触前写像性、耐溶剤性試験後の写像性を溶剤接触後写像性とした。
3-1) Image clarity Measured according to JIS H 8686-2. The image property before the solvent resistance test was defined as the image property before solvent contact, and the image property after the solvent resistance test was defined as the image property after solvent contact.
３−２）変化率
次の式から変化率を算出した。
変化率（％）＝（１−（溶剤接触後写像性／溶剤接触前写像性））×１００
3-2) Rate of change The rate of change was calculated from the following equation.
Rate of change (%) = (1− (image clarity after solvent contact / image clarity before solvent contact)) × 100
表１に示すように、実施例では、トルエン及びメチルエチルケトンを用いた耐溶剤性試験による写像性の変化率が１５％以下であり、極性溶剤及び非極性溶剤に対する耐性が優れる。他方、接着剤として、カゼイン、スチレン−ブタジエンラテックス及び次のＡ、Ｂのいずれかを配合しなかった比較例は、トルエン及びメチルエチルケトンを用いた耐溶剤性試験による写像性の変化率が１５％を超過し、極性溶剤及び非極性溶剤に対する耐性が劣る。
Ａ：ポリアクリル酸系樹脂成分
Ｂ：ポリビニルアルコール系樹脂成分
As shown in Table 1, in the examples, the rate of change in image clarity by a solvent resistance test using toluene and methyl ethyl ketone is 15% or less, and the resistance to polar solvents and nonpolar solvents is excellent. On the other hand, as a comparative example in which casein, styrene-butadiene latex and any of the following A and B are not blended as an adhesive, the rate of change in image clarity by a solvent resistance test using toluene and methyl ethyl ketone is 15%. Exceeds resistance to polar and non-polar solvents.
A: Polyacrylic acid resin component B: Polyvinyl alcohol resin component
本発明は、極性溶剤及び非極性溶剤を用いて製造する合成皮革の工程紙などとして利用するのに好適な合成皮革工程紙用の塗工紙として、適用可能である。 INDUSTRIAL APPLICABILITY The present invention is applicable as a coated paper for a synthetic leather process paper suitable for use as a synthetic leather process paper manufactured using a polar solvent and a nonpolar solvent.
〔塗工層の形成〕
まず、表１に示す種類及び割合で、顔料及び接着剤を常温にて混合撹拌して塗工剤を得た。なお、用いた顔料及び接着剤は以下のとおりである。また、表１の接着剤の配合量は、顔料１００質量部に対する値である。
（顔料）
・炭酸カルシウム（軽質、立方状、品番：白艶華ＰＺ、白石カルシウム社製）
・炭酸カルシウム（軽質、柱状、品番：ＴＰ−１２３、奥多摩工業社製）
・カオリンクレー（品番：ＨＹＤＲＡＳＰＥＲＳＥ９０、ＨＵＢＥＲ社製）
（接着剤）
・カゼイン（日成共益株式会社製）
・スチレン−ブタジエンラテックス（ＳＢＲ）（品番：ＰＡ５０３６、日本エイアンドエル株式会社製）
・ポリアクリル酸−ポリビニルアルコール共重合体（ＰＡＡ−ＰＶＡ）（型番：コーガムＨＷ４００、昭和高分子株式会社製）ただし、実施例２９〜３２では、実施例１で用いたポリアクリル酸−ポリビニルアルコール共重合体のポリアクリル酸及びポリビニルアルコール含有割合のみを変更した共重合体を用いた。
・ポリアクリル酸（ＰＡＡ）（品番：アクアリックＲ ＨＬ、日本触媒株式会社製）
・ポリビニルアルコール（ＰＶＡ）（型番：ＰＶＡ４０５、株式会社クラレ製）
・ウレタン樹脂（型番：アクアプレンＷＳ−１０５、明星化学工業社製）
上記塗料を、前述した基紙に、エアーナイフコーターで片面あたり乾燥質量１２ｇ／ｍ２となるよう塗工し、毎分６０ｍの速度でリウェットキャスト法（再湿潤法）により鏡面仕上げを行った。ただし、実施例３３では鏡面仕上げをゲル化キャスト法で行った。
[Formation of coating layer]
First, a pigment and an adhesive were mixed and stirred at room temperature in the types and ratios shown in Table 1 to obtain a coating agent. The pigments and adhesives used are as follows. Moreover, the compounding quantity of the adhesive agent of Table 1 is a value with respect to 100 mass parts of pigments.
(Pigment )
・ Calcium carbonate (light, cubic, product number: Shiraka Hana PZ, manufactured by Shiraishi Calcium)
・ Calcium carbonate (light, columnar, product number: TP-123, manufactured by Okutama Kogyo Co., Ltd.)
・ Kaolin clay (part number: HYDRASPERSE90, manufactured by HUBER)
(adhesive)
・ Casein (manufactured by Nissei Kyobun Co., Ltd.)
・ Styrene-butadiene latex (SBR) (Part No .: PA5036, manufactured by Nippon A & L Co., Ltd.)
Polyacrylic acid-polyvinyl alcohol copolymer (PAA-PVA) (model number: Cogham HW400, manufactured by Showa Polymer Co., Ltd.) However, in Examples 29 to 32, the polyacrylic acid-polyvinyl alcohol co-polymer used in Example 1 A copolymer in which only the polyacrylic acid and polyvinyl alcohol content in the polymer was changed was used.
・ Polyacrylic acid (PAA) (Part No .: Aquaric R HL, manufactured by Nippon Shokubai Co., Ltd.)
・ Polyvinyl alcohol (PVA) (model number: PVA405, manufactured by Kuraray Co., Ltd.)
-Urethane resin (model number: Aquaprene WS-105, manufactured by Meisei Chemical Co., Ltd.)
The coating material was coated on the above-mentioned base paper with an air knife coater so that the dry mass per side was 12 g / m 2, and mirror-finished by a rewetting cast method (rewetting method) at a rate of 60 m per minute. However, in Example 33, the mirror finish was performed by the gelled cast method.
Claims (6)
Ａ：ポリアクリル酸系樹脂成分
Ｂ：ポリビニルアルコール系樹脂成分 A coated paper comprising a base paper and a coating layer provided on the base paper, wherein the coating layer is mainly composed of a pigment and an adhesive, and casein, styrene-butadiene latex as the adhesive, and A coated paper comprising the following two types of resin components A and B.
A: Polyacrylic acid resin component B: Polyvinyl alcohol resin component
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| JP2015132031A (en) * | 2014-01-15 | 2015-07-23 | 日本製紙株式会社 | Low gloss release paper base material |
| WO2018222147A1 (en) * | 2017-05-31 | 2018-12-06 | Scg Packaging Public Compagny Limited | Coating composition and substrate coated with said coating composition |
| WO2019188003A1 (en) * | 2018-03-30 | 2019-10-03 | 日本製紙株式会社 | Cast-coated paper for process-paper base material |
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| WO2018222147A1 (en) * | 2017-05-31 | 2018-12-06 | Scg Packaging Public Compagny Limited | Coating composition and substrate coated with said coating composition |
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| JPWO2019188003A1 (en) * | 2018-03-30 | 2021-04-01 | 日本製紙株式会社 | Cast coated paper for process paper base material |
| JP7217264B2 (en) | 2018-03-30 | 2023-02-02 | 日本製紙株式会社 | Cast coated paper for casting paper base material |
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