JP2006183209A - Composition for coating electrophotographic printing paper and electrophotographic printing paper - Google Patents
Composition for coating electrophotographic printing paper and electrophotographic printing paper Download PDFInfo
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- JP2006183209A JP2006183209A JP2004380114A JP2004380114A JP2006183209A JP 2006183209 A JP2006183209 A JP 2006183209A JP 2004380114 A JP2004380114 A JP 2004380114A JP 2004380114 A JP2004380114 A JP 2004380114A JP 2006183209 A JP2006183209 A JP 2006183209A
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- 238000007639 printing Methods 0.000 title claims abstract description 120
- 238000000576 coating method Methods 0.000 title claims abstract description 47
- 239000011248 coating agent Substances 0.000 title claims abstract description 42
- 239000000203 mixture Substances 0.000 title claims abstract description 41
- 239000000049 pigment Substances 0.000 claims abstract description 93
- 239000004033 plastic Substances 0.000 claims abstract description 62
- 229920003023 plastic Polymers 0.000 claims abstract description 62
- 239000007787 solid Substances 0.000 claims abstract description 30
- 239000011230 binding agent Substances 0.000 claims abstract description 25
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 22
- 239000000178 monomer Substances 0.000 claims abstract description 13
- 239000001023 inorganic pigment Substances 0.000 claims abstract description 12
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 11
- 125000001931 aliphatic group Chemical group 0.000 claims abstract description 10
- 150000001993 dienes Chemical class 0.000 claims abstract description 10
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 9
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 9
- 239000004927 clay Substances 0.000 claims abstract description 9
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 36
- 239000008199 coating composition Substances 0.000 claims description 31
- 239000004816 latex Substances 0.000 claims description 20
- 229920000126 latex Polymers 0.000 claims description 20
- 239000011247 coating layer Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 238000009472 formulation Methods 0.000 description 12
- 230000035699 permeability Effects 0.000 description 12
- 229920002472 Starch Polymers 0.000 description 11
- 239000008107 starch Substances 0.000 description 11
- 235000019698 starch Nutrition 0.000 description 11
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 10
- 239000000499 gel Substances 0.000 description 8
- 229910052570 clay Inorganic materials 0.000 description 7
- 238000001035 drying Methods 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 6
- 238000006116 polymerization reaction Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000006872 improvement Effects 0.000 description 5
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 4
- MZZSDCJQCLYLLL-UHFFFAOYSA-N Secalonsaeure A Natural products COC(=O)C12OC3C(CC1=C(O)CC(C)C2O)C(=CC=C3c4ccc(O)c5C(=O)C6=C(O)CC(C)C(O)C6(Oc45)C(=O)OC)O MZZSDCJQCLYLLL-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000002270 dispersing agent Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
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- 229920001131 Pulp (paper) Polymers 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
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- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- YAJYJWXEWKRTPO-UHFFFAOYSA-N 2,3,3,4,4,5-hexamethylhexane-2-thiol Chemical compound CC(C)C(C)(C)C(C)(C)C(C)(C)S YAJYJWXEWKRTPO-UHFFFAOYSA-N 0.000 description 2
- 235000000177 Indigofera tinctoria Nutrition 0.000 description 2
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 238000003490 calendering Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- YACLQRRMGMJLJV-UHFFFAOYSA-N chloroprene Chemical compound ClC(=C)C=C YACLQRRMGMJLJV-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 2
- 238000002296 dynamic light scattering Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 229940097275 indigo Drugs 0.000 description 2
- COHYTHOBJLSHDF-UHFFFAOYSA-N indigo powder Natural products N1C2=CC=CC=C2C(=O)C1=C1C(=O)C2=CC=CC=C2N1 COHYTHOBJLSHDF-UHFFFAOYSA-N 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000003921 particle size analysis Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- GAWIXWVDTYZWAW-UHFFFAOYSA-N C[CH]O Chemical group C[CH]O GAWIXWVDTYZWAW-UHFFFAOYSA-N 0.000 description 1
- 229920000298 Cellophane Polymers 0.000 description 1
- 229920000881 Modified starch Polymers 0.000 description 1
- 239000004368 Modified starch Substances 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 108010073771 Soybean Proteins Proteins 0.000 description 1
- RSWGJHLUYNHPMX-ONCXSQPRSA-N abietic acid Chemical compound C([C@@H]12)CC(C(C)C)=CC1=CC[C@@H]1[C@]2(C)CCC[C@@]1(C)C(O)=O RSWGJHLUYNHPMX-ONCXSQPRSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- -1 alkyl ketene dimer Chemical compound 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000004067 bulking agent Substances 0.000 description 1
- 239000005018 casein Substances 0.000 description 1
- 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 description 1
- 235000021240 caseins Nutrition 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 239000007850 fluorescent dye Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000007646 gravure printing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 238000007603 infrared drying Methods 0.000 description 1
- 238000007644 letterpress printing Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 239000001254 oxidized starch Substances 0.000 description 1
- 235000013808 oxidized starch Nutrition 0.000 description 1
- 239000003002 pH adjusting agent Substances 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 235000019710 soybean protein Nutrition 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 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
- 239000004034 viscosity adjusting agent Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 239000003232 water-soluble binding agent Substances 0.000 description 1
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- Paper (AREA)
Abstract
Description
本発明は、電子写真印刷紙塗工用組成物、及び電子写真印刷紙に関し、更に詳しくは、高速塗工時の生産性が良好であるとともに、電子写真印刷時の画質、及び走行性に優れ、ブリスターが発生し難い電子写真印刷紙を得ることが可能な電子写真印刷紙塗工用組成物、並びに、白紙光沢、剛度、及び透気性が良好であるとともに、電子写真印刷時の画質、及び走行性に優れ、ブリスターが発生し難い電子写真印刷紙に関する。 The present invention relates to an electrophotographic printing paper coating composition and electrophotographic printing paper. More specifically, the productivity at high speed coating is good, and the image quality and runnability at electrophotographic printing are excellent. A composition for coating an electrophotographic printing paper capable of obtaining an electrophotographic printing paper that hardly generates blisters, and has good white paper gloss, rigidity, and air permeability, image quality during electrophotographic printing, and The present invention relates to an electrophotographic printing paper that is excellent in running properties and hardly generates blisters.
電子写真印刷紙は、その外観や印刷適性を改良するために、塗工原紙に、カオリンや炭酸カルシウム（重質、軽質）等の白色顔料と、水溶性バインダー（澱粉、ラテックス）とを主成分とする塗工用組成物が塗工されることにより得られる。特に、白紙光沢や走行安定性の向上、更には、ブリスター発生の抑制やトナー定着性の向上等の印刷適性の改良が要求されている。このような要求に応えるべく、塗工用組成物中の配合物の最適化が図られている。具体的には、無機顔料の最適化や、プラスチック顔料の使用、更には、ガラス転移点（Ｔｇ）の高いラテックス（以下、「高Ｔｇラテックス」ともいう）のバインダーとしての使用、といった試みがなされている。 In order to improve the appearance and printability of electrophotographic printing paper, the main ingredients are white pigments such as kaolin and calcium carbonate (heavy and light) and water-soluble binders (starch and latex) in order to improve the appearance and printability. It is obtained by coating the coating composition. In particular, there is a demand for improvement in printability such as improvement of white paper gloss and running stability, and further suppression of blister generation and improvement of toner fixability. In order to meet such demands, the formulation in the coating composition is optimized. Specifically, attempts have been made to optimize inorganic pigments, use plastic pigments, and use latexes having a high glass transition point (Tg) (hereinafter also referred to as “high Tg latex”) as binders. ing.
塗工用組成物中の配合物の最適化により、低圧条件下でのカレンダー処理が可能となることが知られている。また、嵩高い塗工層を形成することにより、塗工紙の剛度（紙腰）、及び白紙光沢の向上が可能であることが知られている。更には、塗工紙の透気性を高めることにより、印刷適性と印刷時の走行安定性の向上が可能であることが知られている。 It is known that calendaring under low pressure conditions is possible by optimizing the formulation in the coating composition. In addition, it is known that by forming a bulky coating layer, it is possible to improve the stiffness (paper stiffness) of coated paper and the gloss of blank paper. Further, it is known that the printability and running stability during printing can be improved by increasing the air permeability of the coated paper.
電子写真印刷紙を、印刷時の走行安定性に優れ、ブリスターが発生し難いものとするためには、その王研式による透気度（ＪＩＳ Ｐ８１１７）を４０００秒以下とし、かつ、剛度(クラーク剛度や加熱剛度)を向上させることが必要とされる。一方、塗工紙の白紙光沢や画質を向上させる手段として、内部に空隙を有する中空プラスチック顔料や、高Ｔｇラテックスを使用する試みがなされている（例えば、特許文献１，２参照）。 In order to make electrophotographic printing paper excellent in running stability during printing and difficult to generate blisters, the air permeability according to the Oken formula (JIS P8117) is set to 4000 seconds or less and the rigidity (Clark) It is necessary to improve rigidity and heating rigidity. On the other hand, attempts have been made to use hollow plastic pigments having voids in the interior and high Tg latex as means for improving the glossiness and image quality of coated paper (see, for example, Patent Documents 1 and 2).
しかしながら、中空プラスチック顔料の配合量を多くすると、塗工用組成物のハイシェアー粘度が上昇してしまい、高速塗工が困難になって、生産性が低下するといった問題がある。この問題は、特にブレード塗工方式を採用した場合に顕著となる。また、高Ｔｇラテックスをバインダーとして使用した場合には、造膜性が良好な範囲で塗工紙の剛度が向上するが、最低造膜温度が５０℃未満であるため塗工層内で成膜し、ピグメントの配向を乱すとともにカレンダー処理しても密実プラスチック顔料や、中空プラスチック顔料と較べ白紙光沢が向上し難いといった問題がある。 However, when the amount of the hollow plastic pigment is increased, the high shear viscosity of the coating composition increases, which makes it difficult to perform high-speed coating, resulting in a decrease in productivity. This problem is particularly noticeable when the blade coating method is employed. In addition, when high Tg latex is used as a binder, the rigidity of the coated paper is improved within a range where the film-forming property is good. However, since the minimum film-forming temperature is less than 50 ° C., the film is formed in the coating layer. However, there is a problem that the gloss of the white paper is difficult to improve as compared with the solid plastic pigment and the hollow plastic pigment even when the orientation of the pigment is disturbed and calendered.
一方、高速塗工性及び生産性の向上を図るべく、中空プラスチック顔料と密実プラスチック顔料を配合することが開示されている（例えば、特許文献３参照）。しかしながら、必要とされるラテックスの配合量も多くなるために、得られる塗工紙の透気度が高くなり、ブリスターが発生し易くなるといった問題がある。また、電子写真印刷時においては、走行安定性が低下する場合がある。
本発明は、このような従来技術の有する問題点に鑑みてなされたものであり、その課題とするところは、高速塗工時の生産性が良好であるとともに、電子写真印刷時の画質、及び走行性に優れ、ブリスターが発生し難い電子写真印刷紙を得ることが可能な電子写真印刷紙塗工用組成物、並びに、白紙光沢、剛度、及び透気性が良好であるとともに、電子写真印刷時の画質、及び走行性に優れ、ブリスターが発生し難い電子写真印刷紙を提供することにある。 The present invention has been made in view of such problems of the prior art, and the problem is that the productivity during high-speed coating is good, the image quality during electrophotographic printing, and An electrophotographic printing paper coating composition capable of obtaining an electrophotographic printing paper that is excellent in running properties and hardly generates blisters, and has good white paper gloss, rigidity, and air permeability, and at the time of electrophotographic printing It is an object to provide an electrophotographic printing paper which is excellent in image quality and running property and hardly causes blisters.
本発明者らは上記課題を達成すべく鋭意検討した結果、無機顔料とともに特定の密実プラスチック顔料を配合し、必要に応じて中空プラスチック顔料を配合することによって、上記課題を達成することが可能であることを見出し、本発明を完成するに至った。 As a result of intensive studies to achieve the above-mentioned problems, the present inventors can achieve the above-mentioned problems by blending specific solid plastic pigments together with inorganic pigments and blending hollow plastic pigments as necessary. As a result, the present invention has been completed.
即ち、本発明によれば、以下に示す電子写真印刷紙塗工用組成物、及び電子写真印刷紙が提供される。 That is, according to the present invention, the following electrophotographic printing paper coating composition and electrophotographic printing paper are provided.
［１］顔料とバインダーとを含有する電子写真印刷紙塗工用組成物であって、前記顔料が、（ａ）カオリンクレー及び／又は炭酸カルシウムを含む無機顔料５０〜９０質量部、（ｂ）脂肪族共役ジエン単量体を２〜２０質量％含有するとともにその内部が密実であり、かつ最低造膜温度（ＭＦＴ）が５０℃以上である密実プラスチック顔料１０〜５０質量部、及び（ｃ）中空プラスチック顔料０〜１０質量部（但し、（ａ）＋（ｂ）＋（ｃ）＝１００質量部）、からなるものである電子写真印刷紙塗工用組成物。 [1] An electrophotographic printing paper coating composition containing a pigment and a binder, wherein the pigment is (a) 50 to 90 parts by mass of an inorganic pigment containing kaolin clay and / or calcium carbonate, (b) 10 to 50 parts by mass of a solid plastic pigment containing 2 to 20% by mass of an aliphatic conjugated diene monomer and having a dense interior and a minimum film-forming temperature (MFT) of 50 ° C. or higher; c) A composition for coating electrophotographic printing paper, comprising 0 to 10 parts by mass of a hollow plastic pigment (provided that (a) + (b) + (c) = 100 parts by mass).
［２］前記バインダーが、前記顔料１００質量部に対して、ラテックスを０〜１０質量部含有するものである前記［１］に記載の電子写真印刷紙塗工用組成物。 [2] The composition for electrophotographic printing paper coating according to [1], wherein the binder contains 0 to 10 parts by mass of latex with respect to 100 parts by mass of the pigment.
［３］前記密実プラスチック顔料の平均粒子径が、７０〜５００ｎｍである前記［１］又は［２］に記載の電子写真印刷紙塗工用組成物。 [3] The electrophotographic printing paper coating composition according to [1] or [2], wherein the dense plastic pigment has an average particle size of 70 to 500 nm.
［４］前記密実プラスチック顔料のトルエンゲル含有量が、９８％以下である前記［１］〜［３］のいずれかに記載の電子写真印刷紙塗工用組成物。 [4] The composition for electrophotographic printing paper coating according to any one of [1] to [3], wherein the solid plastic pigment has a toluene gel content of 98% or less.
［５］塗工原紙と、前記塗工原紙に塗工された前記［１］〜［４］のいずれかに記載の電子写真印刷紙塗工用組成物からなる塗工層とを備え、白紙光沢が６０％以上である電子写真印刷紙。 [5] A blank paper comprising a coated base paper and a coating layer comprising the composition for electrophotographic printing paper coating according to any one of [1] to [4] coated on the coated base paper. An electrophotographic printing paper having a gloss of 60% or more.
［６］前記塗工原紙に、前記塗工層がブレード塗工方式で塗工された前記［５］に記載の電子写真印刷紙。 [6] The electrophotographic printing paper according to [5], wherein the coating layer is coated on the coated base paper by a blade coating method.
［７］ＪＩＳ Ｐ８１２９に準拠した強度試験において、ワックス番号１０Ａ以下でピッキングが発生しないものである前記［５］又は［６］に記載の電子写真印刷紙。 [7] The electrophotographic printing paper according to [5] or [6], wherein the picking does not occur when the wax number is 10 A or less in a strength test according to JIS P8129.
本発明の電子写真印刷紙塗工用組成物は、高速塗工時の生産性が良好であるとともに、電子写真印刷時の画質、及び走行性に優れ、ブリスターが発生し難い電子写真印刷紙を得ることが可能であるという効果を奏するものである。 The composition for coating electrophotographic printing paper of the present invention is an electrophotographic printing paper that has good productivity at high-speed coating, is excellent in image quality and running property during electrophotographic printing, and is less susceptible to blistering. There is an effect that it can be obtained.
また、本発明の電子写真印刷紙は、白紙光沢、剛度、及び透気性が良好であるとともに、電子写真印刷時の画質、及び走行性に優れ、ブリスターが発生し難いという効果を奏するものである。 In addition, the electrophotographic printing paper of the present invention has excellent white paper gloss, rigidity, and air permeability, and is excellent in image quality and runnability during electrophotographic printing, and has the effect that blisters are hardly generated. .
以下、本発明の実施の最良の形態について説明するが、本発明は以下の実施の形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で、当業者の通常の知識に基づいて、以下の実施の形態に対し適宜変更、改良等が加えられたものも本発明の範囲に入ることが理解されるべきである。なお、本明細書において「中空」とは、顔料やラテックス等の粒子内部に閉空間（電子顕微鏡等で観察することができ、実際には気体又は液体が存在することが多い）が存在する状態をいう。一方、「密実」とは、前記「中空」に対する概念であり、前述のような閉空間が存在しない状態をいう。 BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present invention will be described below, but the present invention is not limited to the following embodiment, and is based on the ordinary knowledge of those skilled in the art without departing from the gist of the present invention. It should be understood that modifications and improvements as appropriate to the following embodiments also fall within the scope of the present invention. In this specification, the term “hollow” means a state in which a closed space (which can be observed with an electron microscope or the like, and in reality often contains gas or liquid) is present inside particles such as pigment and latex. Say. On the other hand, “dense” is a concept with respect to the “hollow” and refers to a state where there is no closed space as described above.
本発明の電子写真印刷紙塗工用組成物の一実施形態は、顔料とバインダーとを含有する電子写真印刷紙塗工用組成物であり、顔料が、（ａ）カオリンクレー及び／又は炭酸カルシウムを含む無機顔料５０〜９０質量部、（ｂ）脂肪族共役ジエン単量体を２〜２０質量％含有するとともにその内部が詰まっており（密実）、最低造膜温度（ＭＦＴ）が５０℃以上である密実プラスチック顔料（以下、単に「（ｂ）密実プラスチック顔料」ともいう）１０〜５０質量部、及び（ｃ）その内部に空隙を有する中空プラスチック顔料（以下、単に「（ｃ）中空プラスチック顔料」ともいう）０〜１０質量部（但し、（ａ）＋（ｂ）＋（ｃ）＝１００質量部）、からなるものである。以下、その詳細について説明する。 One embodiment of the electrophotographic printing paper coating composition of the present invention is an electrophotographic printing paper coating composition containing a pigment and a binder, wherein the pigment is (a) kaolin clay and / or calcium carbonate. Containing 50 to 90 parts by weight of an inorganic pigment, (b) 2 to 20% by weight of an aliphatic conjugated diene monomer, and the inside thereof being clogged (solid), and the minimum film-forming temperature (MFT) is 50 ° C. 10-50 parts by mass of the above-described dense plastic pigment (hereinafter also simply referred to as “(b) dense plastic pigment”), and (c) a hollow plastic pigment having a void in the interior thereof (hereinafter simply referred to as “(c) It is composed of 0 to 10 parts by mass (also referred to as “hollow plastic pigment”) (however, (a) + (b) + (c) = 100 parts by mass). The details will be described below.
（顔料）
本実施形態の電子写真印刷紙塗工用組成物に使用する顔料は、（ａ）カオリンクレー及び／又は炭酸カルシウムを含む無機顔料５０〜９０質量部、（ｂ）密実プラスチック顔料１０〜５０質量部、及び（ｃ）中空プラスチック顔料０〜１０質量部（但し、（ａ）＋（ｂ）＋（ｃ）＝１００質量部）、からなるものである。
(Pigment)
The pigment used in the electrophotographic printing paper coating composition of the present embodiment includes (a) 50 to 90 parts by mass of an inorganic pigment containing kaolin clay and / or calcium carbonate, and (b) 10 to 50 parts by mass of a plastic pigment. Part, and (c) 0 to 10 parts by mass of a hollow plastic pigment (however, (a) + (b) + (c) = 100 parts by mass).
（ａ）無機顔料は、全顔料１００質量部中、５０〜９０質量部、好ましくは５５〜８５質量部含有される。（ａ）無機顔料の含有量が、全顔料１００質量部中、５０質量部未満であると、ブリスターが劣る傾向にある。またコスト的にも高くなる。一方、（ａ）無機顔料の含有量が、全顔料１００質量部中、９０質量部超であると、得られる電子写真印刷紙の白紙光沢が悪化し、画質が劣る傾向にある。（ａ）無機顔料には、カオリンクレー及び／又は炭酸カルシウムが含まれる。なお、本発明の電子写真印刷紙塗工用組成物が奏する効果を損なわない限りにおいて、軽質炭酸カルシウム、二酸化酸化チタン、水酸化アルミニウム等の従来の無機顔料を同時に使用することもできる。 (A) The inorganic pigment is contained in an amount of 50 to 90 parts by mass, preferably 55 to 85 parts by mass in 100 parts by mass of the total pigment. (A) If the content of the inorganic pigment is less than 50 parts by mass in 100 parts by mass of the total pigment, the blister tends to be inferior. In addition, the cost increases. On the other hand, when the content of the inorganic pigment (a) is more than 90 parts by mass in 100 parts by mass of the total pigment, the gloss of white paper of the obtained electrophotographic printing paper is deteriorated and the image quality tends to be inferior. (A) Inorganic pigments include kaolin clay and / or calcium carbonate. In addition, as long as the effect which the composition for electrophotographic printing paper coating of this invention show | plays is not impaired, conventional inorganic pigments, such as a light calcium carbonate, a titanium dioxide oxide, and aluminum hydroxide, can also be used simultaneously.
（ｂ）密実プラスチック顔料は、全顔料１００質量部中、１０〜５０質量部、好ましくは１０〜４０質量部含有される。（ｂ）密実プラスチック顔料の含有量が、全顔料１００質量部中、１０質量部未満であると、白紙光沢が発現し難い。一方、（ｂ）密実プラスチック顔料の含有量が、全顔料１００質量部中、５０質量部超であると、この電子写真印刷紙塗工用組成物を用いた電子写真印刷紙で印刷を行う際に、重送や紙詰り等の不具合を生じ易くなる。 (B) The solid plastic pigment is contained in an amount of 10 to 50 parts by mass, preferably 10 to 40 parts by mass in 100 parts by mass of the total pigment. (B) When the content of the solid plastic pigment is less than 10 parts by mass in 100 parts by mass of all pigments, the glossiness of the white paper is hardly exhibited. On the other hand, when the content of the (b) dense plastic pigment is more than 50 parts by mass in 100 parts by mass of the total pigment, printing is performed with the electrophotographic printing paper using the composition for electrophotographic printing paper coating. At this time, problems such as double feeding and paper jam are likely to occur.
また、（ｂ）密実プラスチック顔料は、脂肪族共役ジエン単量体を２〜２０質量％、好ましくは３〜１８質量％含有するものである。この脂肪族共役ジエン単量体を所定量含有することにより、（ｂ）密実プラスチック顔料はバインダー機能を発現する。脂肪族共役ジエン単量体の含有割合が２質量％未満であると、（ｂ）密実プラスチック顔料がバインダー機能を発現し難い。一方、脂肪族共役ジエン単量体の含有割合が２０質量％超であると、顔料としての機能が低下してしまい、白紙光沢が発現し難く、走行安定性も低下してしまう。 Further, (b) the dense plastic pigment contains 2 to 20% by mass, preferably 3 to 18% by mass of the aliphatic conjugated diene monomer. By containing a predetermined amount of this aliphatic conjugated diene monomer, the (b) dense plastic pigment exhibits a binder function. When the content ratio of the aliphatic conjugated diene monomer is less than 2% by mass, the dense plastic pigment (b) hardly exhibits a binder function. On the other hand, when the content ratio of the aliphatic conjugated diene monomer is more than 20% by mass, the function as a pigment is lowered, white paper gloss is hardly exhibited, and running stability is also lowered.
（ｂ）密実プラスチック顔料に含有される脂肪族共役ジエン単量体としては、１，３−ブタジエン、イソプレン、２−クロロ−１，３−ブタジエン、クロロプレン等を挙げることができる。これらの中でも、１，３−ブタジエンが好ましい。これらの脂肪族共役ジエン単量体は、１種単独で、又は２種以上を組み合わせて使用することができる。 (B) Examples of the aliphatic conjugated diene monomer contained in the dense plastic pigment include 1,3-butadiene, isoprene, 2-chloro-1,3-butadiene, chloroprene and the like. Among these, 1,3-butadiene is preferable. These aliphatic conjugated diene monomers can be used alone or in combination of two or more.
（ｂ）密実プラスチック顔料の平均粒子径は、７０〜５００ｎｍであることが好ましく、８０〜４５０ｎｍであることが更に好ましい。（ｂ）密実プラスチック顔料の平均粒子径が７０ｎｍ未満であったり、５００ｎｍ超である場合には、電子写真印刷紙を安定的に製造し難くなる傾向にある。なお、本明細書にいう「平均粒子径」とは、動的光散乱法を利用して測定した物性値であって、キュムラント法による平均粒子径のことをいう。動的光散乱法を利用した平均粒子径の測定は、例えば、大塚電子社の「レーザー粒径解析システムＬＰ−５１０、モデルＰＡＲ−ＩＩＩ」によって実施することができる。 (B) The average particle diameter of the dense plastic pigment is preferably 70 to 500 nm, and more preferably 80 to 450 nm. (B) When the average particle diameter of the dense plastic pigment is less than 70 nm or more than 500 nm, it tends to be difficult to stably produce electrophotographic printing paper. The “average particle size” in the present specification is a physical property value measured using a dynamic light scattering method, and means an average particle size by a cumulant method. The measurement of the average particle diameter using the dynamic light scattering method can be performed by, for example, “Laser Particle Size Analysis System LP-510, Model PAR-III” manufactured by Otsuka Electronics Co., Ltd.
また、（ｂ）密実プラスチック顔料のトルエンゲル含有量は、９８％以下であることが好ましく、１０〜９５％であることが更に好ましい。（ｂ）密実プラスチック顔料のトルエンゲル含有量が９８％超であると、この電子写真印刷塗工用組成物を用いて塗工形成した塗工層の強度が低下する傾向にある。なお、本明細書にいう「トルエンゲル含有量」とは、（ｂ）密実プラスチック顔料をイソプロパノール中で凝固させ、得られた凝固物をトルエンに浸漬させた場合における、トルエン中に残存する固形物の、前記凝固物に対する質量比率（トルエンゲル含有率）をいう。 In addition, the toluene gel content of the (b) dense plastic pigment is preferably 98% or less, and more preferably 10 to 95%. (B) If the toluene gel content of the dense plastic pigment is more than 98%, the strength of the coating layer formed by coating using this composition for electrophotographic printing tends to be lowered. The “toluene gel content” referred to in the present specification means (b) a solid solid remaining in toluene when the solid plastic pigment is solidified in isopropanol and the obtained solidified product is immersed in toluene. The mass ratio (toluene gel content rate) with respect to the said solidified material of a thing is said.
（ｂ）密実プラスチック顔料の最低造膜温度（ＭＦＴ）は５０℃以上であり、好ましくは５０〜１００℃、更に好ましくは５５〜９５℃である。（ｂ）密実プラスチック顔料の最低造膜温度が５０℃未満であると、原紙に塗工・乾燥した後に成膜し過ぎてしまって、（ｂ）密実プラスチック顔料の粒子の形が残らず、得られる電子写真印刷紙の白紙光沢が低下するとともに透気度が上昇し、ブリスターを生じ易くなる傾向にある。なお、（ｂ）密実プラスチック顔料の最低造膜温度の上限値については特に限定されないが、９０℃超になると徐々に塗工層の強度が発現しなくなり、９５℃超になると塗工層の強度低下が激しくなる傾向にある。ここで、本明細書にいう「最低造膜温度」とは、通常「ＭＦＴ」と称され、ラテックス単体を乾燥させた時に、連続フィルムを形成することのできる乾燥温度のことをいう。なお、本明細書において「（ｂ）密実プラスチック顔料」とは、バインダー機能を有し最低造膜温度が５０℃以上である密実プラスチック、のことをいう。 (B) The minimum film-forming temperature (MFT) of the solid plastic pigment is 50 ° C. or higher, preferably 50 to 100 ° C., more preferably 55 to 95 ° C. (B) If the minimum film-forming temperature of the dense plastic pigment is less than 50 ° C., the film is excessively formed after being coated and dried on the base paper, and (b) the shape of the dense plastic pigment particles does not remain. The resulting electrophotographic printing paper has a lower white gloss and a higher air permeability, which tends to cause blistering. In addition, the upper limit of the minimum film-forming temperature of the dense plastic pigment is not particularly limited, but when it exceeds 90 ° C, the strength of the coating layer gradually disappears, and when it exceeds 95 ° C, There is a tendency for strength reduction to become severe. Here, the “minimum film-forming temperature” referred to in the present specification is usually referred to as “MFT” and refers to a drying temperature at which a continuous film can be formed when a single latex is dried. In the present specification, “(b) a solid plastic pigment” means a solid plastic having a binder function and a minimum film forming temperature of 50 ° C. or higher.
（ｃ）中空プラスチック顔料は、全顔料１００質量部中、０〜１０質量部、好ましくは０〜７質量部含有される。（ｃ）中空プラスチック顔料の含有量が、全顔料１００質量部中、１０質量部超であると、塗工用組成物の濃度が低くなるとともにハイシェアー粘度が高くなり過ぎてしまい、高速塗工に不適となる場合がある。なお、（ｃ）中空プラスチック顔料の具体例としては、商品名「ＡＥ８５１」（ＪＳＲ社製）、「ローペイク」（ロームアンドハース社製）、「ＭＨシリーズ」（日本ゼオン社製）等を挙げることができる。（ｃ）中空プラスチック顔料の最低造膜温度（ＭＦＴ）は、通常、８０℃以上であり、好ましくは１００℃以上である。なお、（ｃ）中空プラスチック顔料は、常温において非造膜性である。 (C) The hollow plastic pigment is contained in 0 to 10 parts by mass, preferably 0 to 7 parts by mass in 100 parts by mass of the total pigment. (C) When the content of the hollow plastic pigment is more than 10 parts by mass in 100 parts by mass of the total pigment, the concentration of the coating composition becomes low and the high shear viscosity becomes too high. May be inappropriate. Specific examples of the hollow plastic pigment (c) include trade names “AE851” (manufactured by JSR), “Ropeke” (manufactured by Rohm and Haas), “MH series” (manufactured by ZEON Corporation), and the like. Can do. (C) The minimum film-forming temperature (MFT) of the hollow plastic pigment is usually 80 ° C. or higher, preferably 100 ° C. or higher. Note that (c) the hollow plastic pigment is non-film-forming at room temperature.
（バインダー（ラテックス））
本実施形態の電子写真印刷紙塗工用組成物に使用するバインダーは、顔料１００質量部に対して、ラテックスを０〜１０質量部含有するものであることが好ましく、０〜８質量部含有するものであることが更に好ましい。ラテックスの含有量が、顔料１００質量部に対して１０質量部超であると、この電子写真印刷紙塗工用組成物を用いて得られた電子写真印刷紙の透気度が低下し、ブリスターが発生し易くなるとともに、印刷時の重送や貼り付き等の不具合を生じ易くなる傾向にある。
(Binder (Latex))
The binder used in the electrophotographic printing paper coating composition of this embodiment preferably contains 0 to 10 parts by mass of latex, and 0 to 8 parts by mass with respect to 100 parts by mass of the pigment. More preferably. When the latex content is more than 10 parts by mass with respect to 100 parts by mass of the pigment, the air permeability of the electrophotographic printing paper obtained using this composition for electrophotographic printing paper coating decreases, and blister Tends to occur and tends to cause problems such as double feeding and sticking during printing.
バインダーに含有されるラテックスとしては、スチレン、ブタジエン系ラテックス、アクリル系ラテックスを挙げることができるが、特に限定されるものではない。 Examples of the latex contained in the binder include styrene, butadiene latex, and acrylic latex, but are not particularly limited.
（バインダー（その他））
本実施形態の電子写真印刷紙塗工用組成物に使用するバインダーは、上述したラテックスの以外にも、澱粉、カゼイン、大豆蛋白等を含有してもよい。これらの中では、澱粉が好ましい。澱粉としては、燐酸エステル化澱粉、ヒドロキシエチルエーテル化澱粉、酸化澱粉、酵素変性澱粉等の加工澱粉を使用することができる。これらは、１種単独で、又は２種以上を組み合わせて使用することができる。
(Binder (Other))
The binder used in the electrophotographic printing paper coating composition of the present embodiment may contain starch, casein, soybean protein and the like in addition to the latex described above. Of these, starch is preferred. As the starch, processed starch such as phosphate esterified starch, hydroxyethyl etherified starch, oxidized starch, and enzyme-modified starch can be used. These can be used singly or in combination of two or more.
（電子写真印刷紙塗工用組成物）
本実施形態の電子写真印刷紙塗工用組成物は、上述してきた顔料と、バインダーとを含有するものである。電子写真印刷紙塗工用組成物に含有される顔料とバインダーとの質量比は、顔料１００質量部に対して、バインダー７〜１８質量部（固形分として）であることが好ましい。バインダーの含有量が、顔料１００質量部に対して７質量部未満であると、バインダーとしての十分な接着機能を発現し難くなる。一方、１８質量部超であると、得られる電子写真印刷紙の白紙光沢を損ねたり、また、過度な粘着性に起因して、塗工紙製造プロセスや塗工紙印刷プロセスにおいて操業トラブルを生ずる場合もある。ここで、バインダーの固形分とは、バインダーから、分散媒又は溶媒である水を除いた残りの成分をいう。
(Electrophotographic printing paper coating composition)
The electrophotographic printing paper coating composition of the present embodiment contains the pigment described above and a binder. The mass ratio of the pigment and the binder contained in the composition for electrophotographic printing paper coating is preferably 7 to 18 parts by mass (as solid content) with respect to 100 parts by mass of the pigment. When the content of the binder is less than 7 parts by mass with respect to 100 parts by mass of the pigment, it is difficult to exhibit a sufficient adhesive function as a binder. On the other hand, if it exceeds 18 parts by mass, the gloss of the resulting electrophotographic printing paper is impaired, and operation troubles occur in the coated paper manufacturing process and the coated paper printing process due to excessive stickiness. In some cases. Here, the solid content of the binder refers to the remaining components obtained by removing water as a dispersion medium or a solvent from the binder.
本実施形態の電子写真印刷紙塗工用組成物に含有される、顔料とバインダーとの合計量は、紙塗工用組成物全体に対して９０質量％以上であることが好ましく、９５〜９９質量％であることが更に好ましい。また、本実施形態の電子写真印刷紙塗工用組成物には、上述してきた顔料及びバインダーに加えて、耐水性改良剤、顔料分散剤、粘度調節剤、着色顔料、蛍光染料、及びｐＨ調節剤等、一般に使用されている種々の添加剤を任意に配合することができる。顔料、バインダー、その他添加剤を含む固形分濃度は、３０〜７０質量％であることが好ましい。 The total amount of the pigment and the binder contained in the electrophotographic printing paper coating composition of the present embodiment is preferably 90% by mass or more with respect to the total paper coating composition, and is 95 to 99. More preferably, it is mass%. In addition to the pigment and binder described above, the electrophotographic printing paper coating composition of the present embodiment includes a water resistance improver, a pigment dispersant, a viscosity modifier, a color pigment, a fluorescent dye, and a pH adjuster. Various additives generally used such as an agent can be arbitrarily blended. The solid content concentration including the pigment, binder, and other additives is preferably 30 to 70% by mass.
（電子写真印刷紙）
次に、本発明の電子写真印刷紙の一実施形態について説明する。本実施形態の電子写真印刷紙は、塗工原紙と、この塗工原紙に塗工された、上述してきたいずれかの電子写真印刷紙塗工用組成物からなる塗工層とを備え、白紙光沢が６０％以上のものである。以下、その詳細について説明する。
(Electrophotographic printing paper)
Next, an embodiment of the electrophotographic printing paper of the present invention will be described. The electrophotographic printing paper of this embodiment comprises a coating base paper and a coating layer made of any of the above-described electrophotographic printing paper coating compositions coated on the coating base paper, and is a blank paper The gloss is 60% or more. The details will be described below.
（塗工原紙）
本実施形態の電子写真印刷紙を構成する塗工原紙の種類は特に限定されないが、上述した電子写真印刷紙塗工用組成物を塗工することにより、塗工紙として使用可能となるものであればよい。塗工原紙の原料パルプの種類は特に限定されず、例えば、機械パルプ、化学パルプ、古紙パルプ（ＤＩＰ）等を挙げることができる。また、塗工原紙には、内添剤として炭酸カルシウム、クレー、及びタルク等の顔料、アルキルケテンダイマー、ロジン酸石鹸、及び硫酸バンド等のサイズ剤、カチオン澱粉、及びポリアクリルアミド等の紙力増強剤、並びに嵩高剤等を使用することもできる。更に、塗工原紙の表面には、サイズプレス、ゲートロールコーター、メータードサイズプレス等を使用して、アクリルアミド又はアクリル−スチレンポリマー等の表面サイズ剤を塗布することもできる。
(Coated base paper)
The type of the base paper for forming the electrophotographic printing paper of the present embodiment is not particularly limited, but it can be used as a coating paper by applying the above-described electrophotographic printing paper coating composition. I just need it. The kind of the raw material pulp of the coated base paper is not particularly limited, and examples thereof include mechanical pulp, chemical pulp, and waste paper pulp (DIP). In addition, for coated base paper, pigments such as calcium carbonate, clay and talc as internal additives, sizing agents such as alkyl ketene dimer, rosin acid soap, and sulfuric acid band, cationic starch, and paper strength enhancement such as polyacrylamide Agents, bulking agents and the like can also be used. Further, a surface sizing agent such as acrylamide or acrylic-styrene polymer can be applied to the surface of the coated base paper using a size press, a gate roll coater, a metered size press, or the like.
（塗工層）
本実施形態の電子写真印刷紙を構成する塗工層は、上述してきた電子写真印刷紙塗工用組成物が、塗工原紙の片面当たり、３〜２０ｇ／ｍ2塗工されて形成されたものであることが好ましい。３ｇ／ｍ2未満であると、白紙光沢や印刷光沢が低下することがある。一方、２０ｇ／ｍ2超であると、コストの割りに品質の向上が小さくなることがある。
(Coating layer)
The coating layer constituting the electrophotographic printing paper of the present embodiment was formed by applying the above-described electrophotographic printing paper coating composition 3 to 20 g / m 2 per side of the coating base paper. It is preferable. If it is less than 3 g / m 2 , blank paper gloss and print gloss may be lowered. On the other hand, if it exceeds 20 g / m 2 , the improvement in quality may be small for the cost.
（電子写真印刷紙の製造）
本実施形態の電子写真印刷紙は、塗工原紙に対して、上述した電子写真印刷紙塗工用組成物を塗工して塗工層を形成することによって製造することができる。電子写真印刷紙塗工用組成物を塗工するに際して、ブレードコーターにより塗工するブレード塗工方式を採用すると、塗工面を平滑にでき白紙光沢が向上するために好ましい。
(Manufacture of electrophotographic printing paper)
The electrophotographic printing paper of this embodiment can be produced by applying the above-described electrophotographic printing paper coating composition to a coating base paper to form a coating layer. When applying the composition for coating electrophotographic printing paper, it is preferable to employ a blade coating method in which coating is performed with a blade coater, because the coated surface can be smoothed and the gloss of white paper is improved.
本実施形態の電子写真印刷紙を製造するに際しては、上述した、ブレード塗工方式により塗工層を形成する工程以外に、電子写真印刷紙塗工用組成物を塗工して未乾燥塗工紙を作製した後に、その未乾燥塗工紙を乾燥させる乾燥工程を有することが好ましい。乾燥工程における乾燥方法としては、特に限定されるものではなく、一般の塗工紙の製造方法において用いられている方法を採用することができる。例えば、熱風乾燥、赤外線乾燥、マイクロ波乾燥等を採用することができる。これらは、１種を単独で、又は２種以上を組み合わせて使用することができる。 In producing the electrophotographic printing paper of the present embodiment, in addition to the above-described step of forming the coating layer by the blade coating method, the electrophotographic printing paper coating composition is applied and undried coating is performed. It is preferable to have a drying step of drying the undried coated paper after producing the paper. The drying method in the drying step is not particularly limited, and a method used in a general coated paper manufacturing method can be employed. For example, hot air drying, infrared drying, microwave drying, or the like can be employed. These can be used individually by 1 type or in combination of 2 or more types.
本実施形態の電子写真印刷紙を製造するに際しては、上記乾燥工程の後に、更に、カレンダー処理をしてもよい。カレンダー処理を行うことで、得られる電子写真印刷紙の白紙光沢及び印刷光沢を十分に引き出すことができる。カレンダー処理としては、スーパーカレンダー、マシンカレンダー、及びソフトニップカレンダー等を挙げることができる。これらは１種のみを施してもよく、２種以上を施してもよい。なお、本実施形態の電子写真印刷紙を製造するに際しては、上述の工程以外に適宜所望の工程を有してもよい。 When the electrophotographic printing paper of this embodiment is manufactured, a calendar process may be further performed after the drying step. By performing the calendar process, it is possible to sufficiently bring out the blank gloss and print gloss of the obtained electrophotographic printing paper. Examples of the calendar process include a super calendar, a machine calendar, and a soft nip calendar. These may give only 1 type and may give 2 or more types. In addition, when manufacturing the electrophotographic printing paper of this embodiment, you may have a desired process suitably besides the above-mentioned process.
上述の方法等により製造された本実施形態の電子写真印刷紙は、白紙光沢が６０％以上であり、好ましくは６５％以上、更に好ましくは７０％以上であり、電子写真を印刷するための紙として特に好適に使用することができる。また、その他のオフセット印刷用、グラビア印刷等の凹版印刷用、及び凸版印刷用としても使用することができる。なお、本明細書にいう「白紙光沢」とは、ＪＩＳ Ｐ８１４２に準拠して測定された値をいう。また、本実施形態の電子写真印刷紙は、ＪＩＳ Ｐ８１２９に準拠した強度試験において、ワックス番号１０Ａ以下でピッキングが発生しないものであることが好ましく、ワックス番号１５Ａでピッキングが発生しないものであることが更に好ましい。 The electrophotographic printing paper of this embodiment produced by the above-described method has a blank gloss of 60% or more, preferably 65% or more, more preferably 70% or more, and is a paper for printing an electrophotography. Can be used particularly preferably. It can also be used for other offset printing, intaglio printing such as gravure printing, and letterpress printing. In addition, “white paper gloss” in the present specification refers to a value measured in accordance with JIS P8142. Further, the electrophotographic printing paper of this embodiment is preferably one that does not cause picking at a wax number of 10A or less and that does not cause picking at a wax number of 15A in a strength test in accordance with JIS P8129. Further preferred.
以下、本発明を実施例に基づいて具体的に説明するが、本発明はこれらの実施例に限定されるものではない。なお、実施例、比較例中の「部」及び「％」は、特に断らない限り質量基準である。また、各種物性値の測定方法、及び評価方法を以下に示す。 EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to these Examples. In the examples and comparative examples, “parts” and “%” are based on mass unless otherwise specified. Moreover, the measuring method and evaluation method of various physical property values are shown below.
［トルエンゲル含有量］：密実プラスチック顔料、又はラテックスのｐＨを水酸化ナトリウムでｐＨ８．０（２５℃）に調整した後、これをイソプロパノールで凝固させ、得られた凝固物を蒸留水により洗浄し、乾燥させて乾燥試料を得た。その後、所定量（約０．０３ｇ）の乾燥試料を、１００ｍｌのトルエンに、２５℃で、２０時間浸漬した。次いで、この溶液を１２０メッシュの金網で濾過し、得られる残存固形分の質量を測定し、処理前の全固形分に対する割合（質量％）を求めた。 [Toluene gel content]: After adjusting the pH of dense plastic pigment or latex to pH 8.0 (25 ° C.) with sodium hydroxide, this is coagulated with isopropanol, and the resulting coagulated product is washed with distilled water. And dried to obtain a dry sample. Thereafter, a predetermined amount (about 0.03 g) of the dried sample was immersed in 100 ml of toluene at 25 ° C. for 20 hours. Subsequently, this solution was filtered through a 120-mesh wire mesh, the mass of the remaining solid content obtained was measured, and the ratio (% by mass) to the total solid content before treatment was determined.
［平均粒子径］：レーザーパーティクルアナライザー（大塚電子社製商品名「レーザー粒径解析システム、ＬＰ−５１０モデルＰＡＲ−ＩＩＩ」、大塚電子社製）を使用し、光散乱法により測定した。 [Average particle diameter]: A laser particle analyzer (trade name “Laser particle size analysis system, LP-510 model PAR-III” manufactured by Otsuka Electronics Co., Ltd., manufactured by Otsuka Electronics Co., Ltd.) was used, and measurement was performed by a light scattering method.
［最低造膜温度］：熱勾配試験機「ＬＨＹ−Ｗ型」（理学工業社製）を使用して測定した。具体的には、温度勾配をつけた金属板上にラテックス等の試料を筋状にストローやシリンジを用いて塗布した後、外気の影響を受けにくくするため金属板にカバーを被せた室内とする。なお、室内はシリカゲルを用いて湿気を除いた雰囲気とする。筋状に塗布されたラテックスは時間とともにラテックスの水分が無くなり皮膜を形成する。この時、連続的に皮膜を形成し始める温度を「最低造膜温度（ＭＦＴ）」として、温度勾配のついた金属板に取り付けてある温度計（５℃間隔）で測定する。 [Minimum film-forming temperature]: measured using a thermal gradient tester “LHY-W type” (manufactured by Rigaku Corporation). Specifically, after a sample such as latex is applied in a streaky pattern using a straw or syringe on a metal plate with a temperature gradient, the room is covered with a metal plate so that it is less susceptible to the influence of outside air. . Note that the interior of the room is made of silica gel to remove moisture. Latex applied in a streak form loses its moisture over time and forms a film. At this time, the temperature at which the film starts to form continuously is defined as “minimum film forming temperature (MFT)”, and is measured with a thermometer (5 ° C. interval) attached to a metal plate with a temperature gradient.
［ブルックフィールド（ＢＦ）粘度］：「ブルックフィールド粘度計」（ＴＯＫＩＭＥＣ社製）を使用し、６０ｒｐｍで、ローター３にて測定した。 [Brookfield (BF) Viscosity]: “Brookfield viscometer” (manufactured by TOKIMEC) was used and measured with the rotor 3 at 60 rpm.
［ハイシェアー（ＨＳ）粘度］：「ハーキュレスハイシェアー回転粘度計」（熊谷理機工業社製）を使用し、回転体（ボブＦ）を用い、０〜８８００ｒｐｍで、上昇下降時間（ｓｗｅｅｐ ｔｉｍｅ）１０秒の条件で見掛け粘度を測定した。 [High shear (HS) viscosity]: Using a “Hercules high shear rotational viscometer” (manufactured by Kumagai Riki Kogyo Co., Ltd.), using a rotating body (Bob F), 0-8800 rpm, and rise and fall time (sweep time) The apparent viscosity was measured under the condition of 10 seconds.
［白紙光沢］：光沢計（村上色彩社製）を使用し、ＪＩＳ Ｐ８１４２に準拠して測定した。 [Blank gloss]: A gloss meter (Murakami Color Co., Ltd.) was used and measured according to JIS P8142.
［透気度］：王研式透気度計（旭精工社製）を使用し、ＪＩＳ Ｐ８１１７に準拠して測定した。 [Air permeability]: Measured according to JIS P8117 using an Oken type air permeability meter (manufactured by Asahi Seiko Co., Ltd.).
［クラーク剛度］：クラーク剛度計（熊谷理機社製）を使用し、ＪＩＳ Ｐ８１４３に準拠して測定した。 [Clark stiffness]: A Clark stiffness meter (manufactured by Kumagai Riki Co., Ltd.) was used and measured according to JIS P8143.
［塗工層強度］：ＪＩＳ Ｐ８１２９に準拠し、以下の基準に従い◎〜×で評価した。
◎：ワックス番号１５Ａでピッキングが発生しなかった。
○：１０Ａ以下でピッキングが発生せず、ワックス番号１１Ａ以上、１５Ａ以下でピッキングが発生した。
△：ワックス番号５Ａ以下でピッキングが発生せず、ワックス番号６Ａ以上、１０Ａ以下でピッキングが発生した。
×：ワックス番号５Ａ以下でピッキングが発生した。
[Coating layer strength]: In accordance with JIS P8129, the evaluation was evaluated as 〜 to × according to the following criteria.
A: Picking did not occur at wax number 15A.
○: Picking did not occur at 10A or less, and picking occurred at wax numbers 11A or more and 15A or less.
Δ: Picking did not occur when the wax number was 5A or less, and picking occurred when the wax number was 6A or more and 10A or less.
X: Picking occurred at wax number 5A or less.
［ブリスター］：電子写真印刷紙をレーザープリンター（商品名「ＩＲＣ３２２０」、キャノン社製）を使用して、墨トナーでベタ部の両面印刷した後、温度２３℃、湿度６５％の雰囲気下で電子写真印刷紙をオイルバスに漬け込むことにより評価した。具体的には、オイルバスの温度を１８０℃から１０℃づつ上昇させながら電子写真印刷紙をオイルに漬け込み、肉眼とルーペで原紙層からのブリスターとトナー層からのブリスターの発生を確認し、少なくともいずれかの発生が確認された温度を「ブリスター温度（℃）」とした。 [Blister]: Using a laser printer (trade name “IRC3220”, manufactured by Canon Inc.), the electrophotographic printing paper was printed on both sides of the solid part with black toner, and then printed in an atmosphere at a temperature of 23 ° C. and a humidity of 65%. Evaluation was performed by immersing photographic printing paper in an oil bath. Specifically, the electrophotographic printing paper is immersed in oil while increasing the temperature of the oil bath from 180 ° C. by 10 ° C., and the occurrence of blisters from the base paper layer and the toner layer is confirmed with the naked eye and a loupe. The temperature at which any occurrence was confirmed was defined as “blister temperature (° C.)”.
［画質］：レーザープリンター（商品名「ＩＲＣ３２２０」、キャノン社製）を使用して、印刷面として墨、藍、紅、黄のベタ部と文字のパッチを用意し、肉眼とルーペを用いて面感を評価した。光沢ムラ、印刷ムラ、及び凸凹感を下記の基準に従い、◎〜×で評価した。
◎：光沢ムラ、印刷ムラ、凸凹感が極めて良好。
○：光沢ムラ、印刷ムラ、凸凹感が良好。
△：光沢ムラ、印刷ムラ、凸凹感がやや劣る。
×：光沢ムラ、印刷ムラ、凸凹感が明らかに劣る。
[Image quality]: Using a laser printer (trade name “IRC3220”, manufactured by Canon Inc.), prepare black, indigo, red, yellow solid parts and letter patches as the print surface, and use the naked eye and a loupe. The feeling was evaluated. Gloss unevenness, printing unevenness, and unevenness were evaluated according to the following criteria: A to X.
A: Gloss unevenness, printing unevenness, and unevenness are extremely good.
○: Good gloss unevenness, printing unevenness, and unevenness.
Δ: Gloss unevenness, printing unevenness, and unevenness are slightly inferior.
X: Gloss unevenness, printing unevenness, and unevenness are clearly inferior.
［トナー定着性］：レーザープリンター（商品名「ＩＲＣ３２２０」、キャノン社製）を使用して、印刷面として墨、藍、紅、黄のベタ部と文字のパッチを用意した。次いで、印刷面に粘着テープ（商品名「セロハンテープ」、ニチバン社製）をムラなく貼り付けた後、手でゆっくり剥がしたときの、トナーの剥れ度合いをルーペで確認し、以下の基準に従い○×で評価した。
○：トナーの剥れが生じない。
×：トナーの剥れが少しでも確認される。
[Toner fixing property] Using a laser printer (trade name “IRC3220”, manufactured by Canon Inc.), a solid surface of black, indigo, red, and yellow and a patch of characters were prepared as a printing surface. Next, after applying an adhesive tape (product name “Cellophane Tape”, manufactured by Nichiban Co., Ltd.) evenly on the printed surface, check the degree of toner peeling with a magnifying glass when peeled slowly by hand. It evaluated by (circle) x.
○: Toner does not peel off.
X: Toner peeling is confirmed even a little.
［走行性］：レーザープリンター（商品名「ＩＲＣ３２２０」、キャノン社製）を使用して連続５０枚印刷し、以下の基準に従い○〜×で評価した。
○：重送や紙詰りを起さなかった。
△：２６〜５０枚で重送や紙詰りを起した。
×：０〜２５枚で重送や紙詰りを起した。
[Runnability]: Using a laser printer (trade name “IRC3220”, manufactured by Canon Inc.), 50 sheets were continuously printed, and evaluated according to the following criteria: ○ to ×.
○: No double feed or paper jam occurred.
Δ: Double feeding or paper jam occurred in 26 to 50 sheets.
X: Double feed or paper jam occurred in 0 to 25 sheets.
（密実プラスチック顔料Ａの製造）
撹拌機を備え、温度調節の可能なオートクレーブ中に、水２００部、ドデシルベンゼンスルホン酸ナトリウム０．１部、過硫酸カリウム１．０部、重亜硫酸ナトリウム０．５部、ｔ−ドデシルメルカプタン０．３部を予め仕込んだ。次に、一段目成分として、１，３−ブタジエン１．４部、スチレン１６．２部、メチルメタクリレート２部を一括して仕込み、５０℃で３時間反応させ、重合転化率が９０％以上であることを確認した（１段目の重合）。その後、２段目成分として、１，３−ブタジエン５．６部、スチレン６４．８部、メチルメタアクリレート８部、イタコン酸１部、アクリル酸１部を１２時間にわたって連続的に添加しながら６５℃で重合を継続した。連続添加終了後も更に７０℃で３時間反応させ（２段目の重合）、密実プラスチック顔料を得た（この密実プラスチック顔料を「密実プラスチック顔料Ａ」という）。最終的な重合転化率は９９．５％であった。
(Manufacture of dense plastic pigment A)
In an autoclave equipped with a stirrer and adjustable in temperature, 200 parts of water, 0.1 part of sodium dodecylbenzenesulfonate, 1.0 part of potassium persulfate, 0.5 part of sodium bisulfite, t-dodecyl mercaptan, 0. Three parts were charged in advance. Next, as the first stage component, 1.4 parts of 1,3-butadiene, 16.2 parts of styrene, and 2 parts of methyl methacrylate were charged together and reacted at 50 ° C. for 3 hours. The polymerization conversion rate was 90% or more. It was confirmed that there was (first stage polymerization). Thereafter, 5.6 parts of 1,3-butadiene, 64.8 parts of styrene, 8 parts of methyl methacrylate, 1 part of itaconic acid and 1 part of acrylic acid were continuously added over 12 hours as the second stage component. Polymerization was continued at 0 ° C. After completion of the continuous addition, the mixture was further reacted at 70 ° C. for 3 hours (second stage polymerization) to obtain a dense plastic pigment (this dense plastic pigment is referred to as “dense plastic pigment A”). The final polymerization conversion was 99.5%.
（密実プラスチック顔料Ｂ〜Ｌの製造）
表１に示す配合処方とすること以外は、上述した「密実プラスチック顔料Ａの製造」と同様にして、密実プラスチック顔料Ｂ〜Ｌを得た。なお、使用する各モノマー組成が１段目と２段目で均一組成になるよう（酸モノマー、アミドモノマーは２段目で使用）重合を行った。ここで、得られた密実プラスチック顔料の粒子径の調整は、主として乳化剤（ドデシルベンゼンスルホン酸ナトリウム）の量を調整することにより行った。また、トルエンゲル含有量の調整は、主として分子量調整剤（ｔ−ドデシルメルカプタン）の量を調整することにより行った。
(Manufacture of dense plastic pigments B to L)
Except having set it as the mixing | blending prescription shown in Table 1, it carried out similarly to "manufacture of the dense plastic pigment A" mentioned above, and obtained the dense plastic pigments BL. The polymerization was carried out so that each monomer composition used had a uniform composition in the first and second stages (acid monomers and amide monomers were used in the second stage). Here, the particle diameter of the dense plastic pigment obtained was adjusted mainly by adjusting the amount of the emulsifier (sodium dodecylbenzenesulfonate). Moreover, adjustment of toluene gel content was mainly performed by adjusting the quantity of a molecular weight modifier (t-dodecyl mercaptan).
得られた密実プラスチック顔料Ａ〜Ｌのトルエンゲル含有量、平均粒子径、及び最低造膜温度を測定した。測定結果を表１に示す。 The toluene gel content, average particle diameter, and minimum film-forming temperature of the obtained solid plastic pigments A to L were measured. The measurement results are shown in Table 1.
（電子写真印刷紙塗工用組成物（配合（１））の調製）
カオリンクレー（商品名「ミラグロス」、エンゲルハード社製）５２部、重質炭酸カルシウム（商品名「ファイマテック９０」、ファイマテック社製）２０部、密実プラスチック顔料Ａ２５部、中空プラスチック顔料（商品名「ＡＥ８５１」、ＪＳＲ社製）３部、澱粉（商品名「ＭＳ４６００」、日本食品工業社製）２部、ラテックス（商品名「２５３１Ｈ」、ＪＳＲ社製）４部、分散剤（ポリアクリル酸系分散剤；商品名「アロン−Ｔ４０」、東亞合成社製）０．２部、及び水酸化ナトリウム（商品名「水酸化ナトリウム１級」、和光純薬社製）０．１部を使用して、電子写真印刷紙塗工用組成物（配合（１））を調製した。より具体的には、ＳＵＳ製の容器に調整水、分散剤を仕込み、コーレス分散機（島崎社製）の回転速度を２０００ｒｐｍにセットした。次に、容器内にカオリンクレーを徐々に添加し、完全に添加してから分散機の回転速度を６０００ｒｐｍにセットし３０分撹拌を続けた。次に、容器内に重質炭酸カルシウムを添加し、続けて澱粉、水酸化ナトリウムを添加した後、更に１５分撹拌を続けた。次に、コーレス分散機の回転速度を２０００ｒｐｍにして密実プラスチック顔料Ａと中空プラスチック顔料を添加して１０分撹拌した。なお、澱粉は、濃度３０％となるように冷水で予め濃度調整したものを用意し、これを温度調節可能な撹拌機付の装置を使用して９５℃で１時間溶解したものを使用した。
(Preparation of composition for electrophotographic printing paper coating (formulation (1)))
Kaolin clay (trade name “Miragros”, Engelhard) 52 parts, heavy calcium carbonate (trade name “Pimatech 90”, Pimatech) 20 parts, solid plastic pigment A25 parts, hollow plastic pigment (product) Name "AE851", manufactured by JSR Co., Ltd. 3 parts, starch (trade name "MS4600", manufactured by Nippon Food Industry Co., Ltd.) 2 parts, latex (trade name "2531H", manufactured by JSR Corporation) 4 parts, dispersant (polyacrylic acid) Dispersant: 0.2 part of trade name “Aron-T40” manufactured by Toagosei Co., Ltd. and 0.1 part of sodium hydroxide (trade name “Sodium hydroxide grade 1” manufactured by Wako Pure Chemical Industries, Ltd.) Thus, an electrophotographic printing paper coating composition (formulation (1)) was prepared. More specifically, adjustment water and a dispersing agent were charged in a SUS container, and the rotation speed of a coreless disperser (manufactured by Shimazaki Corp.) was set to 2000 rpm. Next, kaolin clay was gradually added into the container, and after complete addition, the rotational speed of the disperser was set to 6000 rpm and stirring was continued for 30 minutes. Next, heavy calcium carbonate was added to the container, and starch and sodium hydroxide were subsequently added, followed by further stirring for 15 minutes. Next, the solid plastic pigment A and the hollow plastic pigment were added at a rotation speed of the coreless disperser of 2000 rpm and stirred for 10 minutes. In addition, the starch used what prepared the density | concentration adjustment previously with cold water so that it might become 30%, and used this which melt | dissolved this at 95 degreeC for 1 hour using the apparatus with a stirrer which can adjust temperature.
（電子写真印刷紙塗工用組成物（配合（２）〜（１６））の調製）
表２に示す配合処方とすること以外は、上述した「電子写真印刷紙塗工用組成物（配合（１））の調製」と同様にして、電子写真印刷紙塗工用組成物（配合（２）〜（１６））を調製した。
(Preparation of composition for electrophotographic printing paper coating (formulations (2) to (16)))
The composition for electrophotographic printing paper coating (formulation (formulation (1)) "was carried out in the same manner as in the above-mentioned" Preparation of composition for electrophotographic printing paper coating (formulation (1)) ", except for the formulation shown in Table 2. 2) to (16)) were prepared.
表２に示す「固形分（質量％）」とは、電子写真印刷紙塗工用組成物の総質量に占める、各成分の総固形分質量の比率（質量％）を意味する。なお、「固形分（質量％）」以外の、各成分を示す数値は質量部で示した。また、電子写真印刷紙塗工用組成物（配合（１）〜（１６））のＢＦ粘度、及びＨＳ粘度を測定した。測定結果を表３に示す。 “Solid content (mass%)” shown in Table 2 means the ratio (mass%) of the total solid mass of each component in the total mass of the composition for electrophotographic printing paper coating. In addition, the numerical value which shows each component other than "solid content (mass%)" was shown by the mass part. Further, the BF viscosity and HS viscosity of the electrophotographic printing paper coating composition (formulations (1) to (16)) were measured. Table 3 shows the measurement results.
（実施例１）
電子写真印刷紙塗工用組成物（配合（１））を使用し、市販上質原紙（８１ｇ／ｍ2）上に、塗工量が片面１０±０．１ｇ／ｍ2となるようにブレード塗工し、１５０℃の熱風で１０秒間乾燥した。ブレード塗工機は枚葉式コーター（ＳＭＴ社製）を用いて塗工した。その後、同条件で裏面を塗工し、これを温度２３℃、湿度５５％の恒温恒湿部屋に２４時間放置した。次いで、線圧６０ｋｇ／ｃｍ、ロール温度３０℃の条件で、由利ロール社製の商品名「ダブルテストカレンダー」を使用してスーパーカレンダー処理を片面当り２回行い、電子写真印刷紙（実施例１）を得た。得られた電子写真印刷紙について各種評価を行った。評価結果を表３に示す。
Example 1
Using a composition for electrophotographic printing paper coating (formulation (1)), blade coating is performed on a commercially available high-quality base paper (81 g / m 2 ) so that the coating amount is 10 ± 0.1 g / m 2 on one side. And dried with hot air at 150 ° C. for 10 seconds. The blade coater was coated using a single wafer coater (manufactured by SMT). Then, the back surface was coated on the same conditions, and this was left to stand for 24 hours in the constant temperature and humidity room of temperature 23 degreeC and humidity 55%. Next, under the conditions of a linear pressure of 60 kg / cm and a roll temperature of 30 ° C., a super calender treatment was performed twice per side using a product name “Double Test Calendar” manufactured by Yuri Roll Co., Ltd. ) Various evaluations were performed on the obtained electrophotographic printing paper. The evaluation results are shown in Table 3.
（実施例２〜１０、比較例１〜６）
電子写真印刷紙塗工用組成物（配合（２）〜（１６））を使用すること以外は、上述した実施例１の場合と同様にして、電子写真印刷紙（実施例２〜１０、比較例１〜６）を得た。得られた電子写真印刷紙について各種評価を行った。評価結果を表３に示す。
(Examples 2 to 10, Comparative Examples 1 to 6)
The electrophotographic printing paper (Examples 2 to 10, compared with Example 1), except that the electrophotographic printing paper coating composition (formulations (2) to (16)) was used. Examples 1 to 6) were obtained. Various evaluations were performed on the obtained electrophotographic printing paper. The evaluation results are shown in Table 3.
実施例１〜１０の電子写真印刷紙は、比較例１〜６の電子写真印刷紙に比して、白紙光沢、クラーク剛度、及び透気性が良好であるとともに、電子写真印刷を行った場合の画質、及び走行性に優れ、ブリスターが発生し難いものであることが明らかである。 The electrophotographic printing papers of Examples 1 to 10 have good white paper gloss, Clark stiffness, and air permeability as compared with the electrophotographic printing papers of Comparative Examples 1 to 6, and the electrophotographic printing paper when electrophotographic printing is performed. It is clear that the image quality and running performance are excellent and blisters are hardly generated.
本発明の電子写真印刷紙塗工用組成物は、白紙光沢、剛度、及び透気性が良好であるとともに、電子写真印刷時の画質、及び走行性に優れ、ブリスターが発生し難い電子写真印刷紙を得るための塗工用組成物として好適である。また、本発明の電子写真印刷紙は、電子写真を印刷するための紙として特に好適である。 The composition for electrophotographic printing paper coating of the present invention has good white paper gloss, stiffness, and air permeability, is excellent in image quality and running property during electrophotographic printing, and is less susceptible to blistering. It is suitable as a coating composition for obtaining the above. Moreover, the electrophotographic printing paper of the present invention is particularly suitable as a paper for printing electrophotography.
Claims (7)
前記顔料が、
（ａ）カオリンクレー及び／又は炭酸カルシウムを含む無機顔料５０〜９０質量部、
（ｂ）脂肪族共役ジエン単量体を２〜２０質量％含有するとともにその内部が密実であり、かつ最低造膜温度（ＭＦＴ）が５０℃以上である密実プラスチック顔料１０〜５０質量部、及び
（ｃ）中空プラスチック顔料０〜１０質量部（但し、（ａ）＋（ｂ）＋（ｃ）＝１００質量部）、
からなるものである電子写真印刷紙塗工用組成物。 An electrophotographic printing paper coating composition containing a pigment and a binder,
The pigment is
(A) 50 to 90 parts by mass of an inorganic pigment containing kaolin clay and / or calcium carbonate,
(B) 10 to 50 parts by mass of a solid plastic pigment containing 2 to 20% by mass of an aliphatic conjugated diene monomer and having a dense interior and a minimum film-forming temperature (MFT) of 50 ° C. or higher. And (c) 0 to 10 parts by mass of a hollow plastic pigment (provided that (a) + (b) + (c) = 100 parts by mass),
An electrophotographic printing paper coating composition comprising:
白紙光沢が６０％以上である電子写真印刷紙。 A coated base paper, and a coating layer comprising the composition for electrophotographic printing paper coating according to any one of claims 1 to 4 coated on the coated base paper,
An electrophotographic printing paper having a gloss of 60% or more.
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| WO2015080132A1 (en) * | 2013-11-28 | 2015-06-04 | 日本ゼオン株式会社 | Pigment dispersant, composition for coated paper, and coated paper |
| JP2019026971A (en) * | 2017-07-31 | 2019-02-21 | 北越コーポレーション株式会社 | Printing paper |
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