JPH0223639B2 - - Google Patents
Info
- Publication number
- JPH0223639B2 JPH0223639B2 JP60168170A JP16817085A JPH0223639B2 JP H0223639 B2 JPH0223639 B2 JP H0223639B2 JP 60168170 A JP60168170 A JP 60168170A JP 16817085 A JP16817085 A JP 16817085A JP H0223639 B2 JPH0223639 B2 JP H0223639B2
- Authority
- JP
- Japan
- Prior art keywords
- parts
- pva
- coated
- coating
- paper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 32
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 32
- 239000008199 coating composition Substances 0.000 claims description 22
- 238000001035 drying Methods 0.000 claims description 20
- 239000000049 pigment Substances 0.000 claims description 14
- 238000001704 evaporation Methods 0.000 claims description 11
- 230000008020 evaporation Effects 0.000 claims description 11
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 4
- 239000000123 paper Substances 0.000 description 52
- 230000002087 whitening effect Effects 0.000 description 28
- 238000000576 coating method Methods 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 15
- 239000002585 base Substances 0.000 description 14
- 239000011248 coating agent Substances 0.000 description 13
- 239000011247 coating layer Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- CNGYZEMWVAWWOB-VAWYXSNFSA-N 5-[[4-anilino-6-[bis(2-hydroxyethyl)amino]-1,3,5-triazin-2-yl]amino]-2-[(e)-2-[4-[[4-anilino-6-[bis(2-hydroxyethyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulfophenyl]ethenyl]benzenesulfonic acid Chemical compound N=1C(NC=2C=C(C(\C=C\C=3C(=CC(NC=4N=C(N=C(NC=5C=CC=CC=5)N=4)N(CCO)CCO)=CC=3)S(O)(=O)=O)=CC=2)S(O)(=O)=O)=NC(N(CCO)CCO)=NC=1NC1=CC=CC=C1 CNGYZEMWVAWWOB-VAWYXSNFSA-N 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 7
- 239000004816 latex Substances 0.000 description 7
- 229920000126 latex Polymers 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 229920002472 Starch Polymers 0.000 description 6
- 239000008107 starch Substances 0.000 description 6
- 235000019698 starch Nutrition 0.000 description 6
- 229920001577 copolymer Chemical class 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 238000013508 migration Methods 0.000 description 4
- 230000005012 migration Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 3
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 3
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 3
- 229920000881 Modified starch Polymers 0.000 description 3
- 239000004368 Modified starch Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 235000012211 aluminium silicate Nutrition 0.000 description 3
- 238000005282 brightening Methods 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 239000000839 emulsion Substances 0.000 description 3
- 238000005562 fading Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 239000006081 fluorescent whitening agent Substances 0.000 description 3
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 235000019426 modified starch Nutrition 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000007127 saponification reaction Methods 0.000 description 3
- 239000000454 talc Substances 0.000 description 3
- 229910052623 talc Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N vinyl-ethylene Natural products C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 3
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical class CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 2
- 229920002134 Carboxymethyl cellulose Chemical class 0.000 description 2
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000004826 Synthetic adhesive Substances 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 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
- 239000001768 carboxy methyl cellulose Chemical class 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 239000008112 carboxymethyl-cellulose Chemical class 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- -1 hydrated hallosite Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 235000010413 sodium alginate Nutrition 0.000 description 2
- 239000000661 sodium alginate Substances 0.000 description 2
- 229940005550 sodium alginate Drugs 0.000 description 2
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004383 yellowing Methods 0.000 description 2
- PYSRRFNXTXNWCD-UHFFFAOYSA-N 3-(2-phenylethenyl)furan-2,5-dione Chemical compound O=C1OC(=O)C(C=CC=2C=CC=CC=2)=C1 PYSRRFNXTXNWCD-UHFFFAOYSA-N 0.000 description 1
- NBOCQTNZUPTTEI-UHFFFAOYSA-N 4-[4-(hydrazinesulfonyl)phenoxy]benzenesulfonohydrazide Chemical compound C1=CC(S(=O)(=O)NN)=CC=C1OC1=CC=C(S(=O)(=O)NN)C=C1 NBOCQTNZUPTTEI-UHFFFAOYSA-N 0.000 description 1
- REJHVSOVQBJEBF-OWOJBTEDSA-N 5-azaniumyl-2-[(e)-2-(4-azaniumyl-2-sulfonatophenyl)ethenyl]benzenesulfonate Chemical class OS(=O)(=O)C1=CC(N)=CC=C1\C=C\C1=CC=C(N)C=C1S(O)(=O)=O REJHVSOVQBJEBF-OWOJBTEDSA-N 0.000 description 1
- 239000004925 Acrylic resin Chemical class 0.000 description 1
- 108010076119 Caseins Proteins 0.000 description 1
- 229920002261 Corn starch Polymers 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 108010058643 Fungal Proteins Proteins 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 108010073771 Soybean Proteins Proteins 0.000 description 1
- PJANXHGTPQOBST-VAWYXSNFSA-N Stilbene Natural products C=1C=CC=CC=1/C=C/C1=CC=CC=C1 PJANXHGTPQOBST-VAWYXSNFSA-N 0.000 description 1
- 229920000147 Styrene maleic anhydride Polymers 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- JETSKDPKURDVNI-UHFFFAOYSA-N [C].[Ca] Chemical compound [C].[Ca] JETSKDPKURDVNI-UHFFFAOYSA-N 0.000 description 1
- 238000006359 acetalization reaction Methods 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000000227 bioadhesive Substances 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 239000001045 blue dye Substances 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
- 150000007942 carboxylates Chemical class 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 229940105329 carboxymethylcellulose Drugs 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
- 230000008859 change Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 229940099112 cornstarch Drugs 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 238000006266 etherification reaction Methods 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007850 fluorescent dye Substances 0.000 description 1
- WSFSSNUMVMOOMR-UHFFFAOYSA-N formaldehyde Substances O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229940071826 hydroxyethyl cellulose Drugs 0.000 description 1
- 229920003063 hydroxymethyl cellulose Chemical class 0.000 description 1
- 229940031574 hydroxymethyl cellulose Drugs 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 125000005397 methacrylic acid ester group Chemical group 0.000 description 1
- 229920000609 methyl cellulose Chemical class 0.000 description 1
- 239000001923 methylcellulose Chemical class 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 229960002900 methylcellulose Drugs 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001254 oxidized starch Substances 0.000 description 1
- 235000013808 oxidized starch Nutrition 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- ODGAOXROABLFNM-UHFFFAOYSA-N polynoxylin Chemical compound O=C.NC(N)=O ODGAOXROABLFNM-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 235000019710 soybean protein Nutrition 0.000 description 1
- PJANXHGTPQOBST-UHFFFAOYSA-N stilbene Chemical compound C=1C=CC=CC=1C=CC1=CC=CC=C1 PJANXHGTPQOBST-UHFFFAOYSA-N 0.000 description 1
- 235000021286 stilbenes Nutrition 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- FUFMEQTUGKXEQF-YZNHWISSSA-J tetrasodium 5-[[4-[bis(2-hydroxyethyl)amino]-6-(3-sulfonatoanilino)-1,3,5-triazin-2-yl]amino]-2-[(E)-2-[4-[[4-[bis(2-hydroxyethyl)amino]-6-(3-sulfonatoanilino)-1,3,5-triazin-2-yl]amino]-2-sulfonatophenyl]ethenyl]benzenesulfonate Chemical compound [Na+].[Na+].[Na+].[Na+].N=1C(NC=2C=C(C(\C=C\C=3C(=CC(NC=4N=C(N=C(NC=5C=C(C=CC=5)S([O-])(=O)=O)N=4)N(CCO)CCO)=CC=3)S([O-])(=O)=O)=CC=2)S([O-])(=O)=O)=NC(N(CCO)CCO)=NC=1NC1=CC=CC(S([O-])(=O)=O)=C1 FUFMEQTUGKXEQF-YZNHWISSSA-J 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 229920006163 vinyl copolymer Polymers 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
Landscapes
- Paper (AREA)
Description
「産業上の利用分野」
本発明は、塗被紙の製造法に関し、特に光や熱
による褪色が少なく、優れた白色度を有する塗被
紙の製造方法に関するものである。
「従来の技術」
従来から塗被紙を増白させる方法としは、パル
プの洗晒、高歩留パルプ使用量の減、白色填料の
内添、青染料による青味付け等の原紙面からの対
策と、白色顔料、螢光増白剤、染料などを含む塗
被組成物をサイズプレスやコーターなどで原紙に
表面塗被する塗被工程からの対策が採られてい
る。
これらの増白対策の中でも、螢光増白剤を用い
る方法は、印刷用紙、白板紙等の白さを向上さ
せ、その商品価値を高める方法として、製紙業界
では普通に行われている白さ向上対策の１つであ
る。
しかし、水溶性螢光増白剤はパルプに対する親
和性が強い為、これを含有とした塗被組成粉を基
紙に塗被した場合、塗被と同時に水と一緒に基紙
に浸透し、その大半が基紙に吸着固定されてしま
う。その為、塗被層自体の増白効果としては、必
ずしも満足すべき結果が得られていないのが現状
である。
特定の水溶性多価カルボン酸塩樹脂と、スチル
ベン型螢光染料を併用することによつて、増白効
果を高める方法〔特公昭48−29802号〕や、特定
の置換度を有するヒドロキシエチルセルロースと
水溶性螢光増白剤を併用することによつて、増白
効果を高める方法〔特公昭57−13678号〕等も提
案されているが、上記の如く特定の多価カルボン
酸塩樹脂やヒドロキシエチルセルロースを要する
為、増白効果改良に伴つて新たな欠陥も付随し、
やはり満足すべき結果が得られていないのが現状
である。
「発明が解決しようとする問題点」
本発明の目的は、特殊な材料を要することな
く、水溶性螢光増剤の塗被層増白効果を、極めて
効率良く改良し得る方法を提供することである。
「問題点を解決するための手段」
本発明は、顔料および接着剤を主成分とし、該
顔料100重量部に対して、ポリビニルアルコール
又はその誘導体を0.05〜2.5重量部、及び水溶性
蛍光増白剤を0.05〜２重量部含有した塗被組成物
を基紙に塗被し、平均蒸発率10〜60Kg／Hr／m2
で乾燥することを特徴とする塗被紙の製造方法で
ある。
「作用」
ポリビニルアルコール又はその誘導体〔以下単
にPVAと略称する〕と水溶性螢光増白剤を併用
することは、例えば、前記特公昭48−29802号や
特公昭57−13678号等で知られている。しかし、
これらの公知文献によれば、PVAと水溶性螢光
増白剤を併用しても、決して優れた増白効果は得
られないとされている。
然るに、本発明者等の検討結果によれば、
PVAの使用量と塗被組成物の乾燥条件を特定の
塗被層増白効果が、極めて効率良く発現され、結
果的に光や熱による褪色が少なく、優れた白色度
を有する塗被紙が得られることが明らかとなつ
た。
即ち、本発明者等は、塗被組成物中に水溶性螢
光増白剤と各種の助剤を添加し、種々の乾燥条件
下で乾燥して得られる塗被紙の増白効果について
鋭意研究した結果、アルギン酸ソーダ、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、ヒドロキシメチルセルロース、メチルセルロ
ース等の繊維素誘導体、PVA、ポリアクリル酸
塩樹脂、スチレンマレイン酸共重合体塩樹脂メラ
ミンホルムアルデヒド樹脂、澱粉及びその誘導
体、尿素ホルムアルデヒド樹脂等に各種助剤のう
ち、特にPVAを特定量使用し、特定の乾燥条件
下で乾燥した場合に限つて、極めて顕著な増白効
果が得られることが明らかとなり、本発明を完成
するに至つたものである。
かかる効果の得られる原因については、明らか
ではないが、本発明者等の考察結果では、PVA
が水溶性螢光増白剤の優れた固定作用を示し、増
白剤が基紙のパルプに吸着されるのを防ぐのみな
らず、塗被組成物を基紙に塗被し乾燥する工程
で、その使用量が特定の条件に設定されており、
且つ乾燥条件も特定の条件に設定されている為、
増白剤を固定したまま塗被層表面にマイグレーシ
ヨンし、結果的に塗被層表面に水溶性螢光増白剤
が効率良く配向して、優れた塗被層の増白効果が
得られるのではないかと推定される。
本発明において用いられるPVAは、酢酸ビニ
ル重合体から加水分解により得られるポリビニル
アルコールのみならず、エステル化、エーテル
化、ウレタン化、アセタール化、架橋化、共重合
化などの変性処理を行つた変性ポリビニルアルコ
ール等の誘導体をも包含するものである。
PVAの重合度は、特定の乾燥条件下において、
塗被層中で適切なマイグレーシヨンを起こして増
白効果に寄与するよう、100〜3000程度の範囲が
好ましく、特に200〜2000程度の重合度を有する
PVAが好ましく用いられる。またPVAのケン化
度は、水溶性螢光増白剤を塗被層中で固定するの
に影響し、ケン化度の高いPVA程増白効果が大
きい為、20モル％以上、より好ましくは60モル％
以上のケン化度を有するPVAが好ましく用いら
れる。
本発明において、PVAの使用割合は極めて重
要であり、その使用量が顔料100重量部に対して、
0.05重量部に至らない時には、本発明の所望の増
白効果を期待することは出来ない。しかし、通
常、接着剤として用いる場合に使用する３〜５重
量部以上といつた高率配合では、PVAと顔料と
の結合性の強さに起因するシヨツク現象によつ
て、塗被組成物の粘度が上昇し、乾燥工程におけ
る塗被層中のPVAの適切なマイグレーシヨンが
阻害されるため、やはり本発明の所望の効果が損
なわれてしまう。その為、PVAの使用割合は、
顔料100重量部に対して、0.05〜2.5量部、より好
ましくは0.05〜1.0重量部の範囲で調節されなく
てはならない。
上記の如く、特定の割合でPVAを含有する本
発明の塗被組成物中に配合される水溶性螢光増白
剤としては、製紙用に一般に用いられるジアミノ
スチルベンジスルホン酸誘導体等のスチルベン系
増白剤が好ましく用いられるが、水溶性であれば
いずれも使用可能であり、勿論２種以上を併用す
ることも可能である。なお、水溶性蛍光増白剤の
使用割合については特に限定するものではない
が、一般には顔料100重量部に対して0.05〜２重
量部、好ましくは0.08〜１重量部の範囲で調節す
るのが望ましい。塗被組成物に使用される顔料に
ついては、特に限定されるものではなく、カオリ
ン、加水ハロサイト、クレー、重質炭素カルシウ
ム、軽質炭酸カルシウム、硫酸バリウム、水酸化
アルミニウム、サチンホワイト、二酸化チタン、
タルク、亜硫酸カルシウム、硫酸亜鉛、プラスチ
ツクピグメント等、通常の塗被紙用顔料がそれぞ
れの顔料性質に応じて適宜配合される。
また接着剤についても、特に限定されず、カゼ
イン、大豆蛋白、酵母蛋白、澱粉、酸化澱粉、エ
ステル化澱粉、エーテル化澱粉、カチオン澱粉等
の変性澱粉、セルロース誘導体等の天然接着剤、
スチレン・ブタジエン共重合体、メチルメタクリ
ルレート・ブタジエン共重合体等の共役ジエン系
共重合体ラテツクス、アクリル及び／又はメタク
リル酸エステルの重合体又は共重合体等のアクリ
ル系重合体ラテツクス、エチレン・酢酸ビニル共
重合体等の酢酸ビニル系重合体ラテツクス等のア
ルカリ非感応性合成接着剤、さらにはスチレン、
ブタジエン、エチレン系不飽和カルボン酸を主成
分とするアルカリ感応性合成樹脂エマルジヨン及
びアルカリ感応性の共重合体ラテツクスにアルカ
リ非感応性のスチレン・ブタジエン系共重合体ラ
テツクスをブレンドした水性エマルジヨン等のア
ルカリ感応性合成接着剤等、通常の塗被紙用接着
剤の１種以上が塗被紙の用途に応じて適宜選択し
て用いられる。
なお、接着剤の配合割合は、一般に顔料100重
量部に対して３〜25重量部程度の範囲で調節され
るが、優れた平滑性、不透明性、白紙光沢、イン
キ光沢を与えるために塗被量を多くし、しかも印
刷適性の改良された塗被紙を得るためには、５〜
20重量部程度の範囲で調節するのが望ましい。
また、一般に塗被紙用組成物に配合される分散
剤、流動変性剤、消泡剤、染料、滑剤、耐水化
剤、保水剤等の各種助剤を必要に応じて適宜配合
することも勿論可能である。
かくして調製された塗被組成物は、基紙の片面
或いは両面にオンマシン或いはオフマシンコータ
ー等で塗被されるが、その塗被量は３ｇ／m2程度
以上になるように、単層ないしは多層コーテイン
グするのが望ましい。その場合、両面の塗被組成
物および多層コーテイングする際の各層を形成す
る塗被組成物の配合は、常法に従つて適宜変える
ことが出来る。
また、塗被方法についても特に限定されるもの
ではなく、エアーナイフコーター、ロールコータ
ー、パドル及びインバーター型のブレードコータ
ーでブレードがベベル及びベント型のコーター、
さらにはビルブレード、ツインブレード、シヨー
トドウエルブレード、ロツドブレード、チヤンプ
レツクス等の各種ブレードコーター等、通常の各
種塗被装置が適宜用いられる。これらの各種塗被
装置のうち、特にブレードコーターはより平滑な
塗被面が得られるため、従来から高品質を有する
塗被紙の製造に好ましく用いられている。
本発明の方法では、かくして基紙に塗被された
特定の塗被組成物を、平均蒸発率が10〜60Kg／
Hr／m2という特定の乾燥条件下で乾燥する必要
がある。
一般に塗被液を塗被した後の乾燥装置として
は、シリンダードライヤー、トンネルドライヤ
ー、フロータードライヤー、エアーキヤツプドラ
イヤー、インフラレツドドライヤー等があり、そ
の蒸発能力は装置の規模、種類等によつて大幅に
異なつている。
本発明では、塗被組成物中のPVAが、塗被層
表面に効率良くマイグレーシヨンして塗被層表面
の増白効果に寄与するよう、少なくとも10Kg／
Hr／m2以上の平均蒸発率で乾燥する必要がある。
10Kg／Hr／m2を下回るような乾燥条件では、本
発明の所望の増白効果を期待することは出来な
い。しかし、平均蒸発率が60Kg／Hr／m2を越え
るような過度な乾燥は、塗被組成物中の水分の急
激な蒸発を来し、結果的にPVAの急激で不均一
なマイグレーシヨンによつて、得られる塗被紙の
印刷適性が低下し、印刷ムラが発生する。また、
塗被層表面が荒れたり、ボコツキ現象が発生する
恐れもある。この為、塗被紙として極めて低品質
なものとなつてしまう。
その為、本発明の方法では、乾燥装置の能力を
平均蒸発率が10〜60Kg／Hr／m2という特定の範
囲に入るように調節して、塗被組成物を乾燥する
必要があるものである。
塗被乾燥後の塗被紙は、常法に従つて、マシン
キヤレンダー、スーパーキヤレンダー、グロスキ
ヤレンダー等の仕上げ装置によつて優れた白紙光
沢、平滑性、印刷適性を有する塗被紙として仕上
げることが出来る。
「効果」
かくして得られる本発明の塗被紙は、塗被層表
面の増白効果が極めて効率良く改良されており、
しかも、ハンターの色度座標で表される色差のｂ
値が青味傾向に進むため、光や熱による褪色、黄
変が防止され、長期保存後の白紙及び印刷物の外
観の変化が少ない極めて優れた特性を有するもの
であつた。また、増白効果が著しいため、塗被紙
の用途に応じて螢光増白剤等の使用量を軽減する
ことも可能であり、経済的にも優れたものであつ
た。
「実施例」
以下に実施例を挙げて本発明をより具体的に説
明するが、勿論これらに限定されるものではな
い。なお、例中の部及び％は、特に断らない限り
それぞれ重量部及び重量％を示す。
実施例１〜３、比較例１〜８
NBK50部、LBK20部、SGP30部から成るパル
プ組成に、ロジンサイズ0.5部、硫酸バンド３部、
内添紙力剤0.6部、填料としてタルク10部を添加
して米坪40ｇ／m2の塗被紙用基紙を得た。
カオリン（EMC社製、UW―90）70部と重質
炭酸カルシウム（備北粉化工業社製、ソフトン
2200）30部をポリアクリル酸ソーダ0.2部を用い
て分散し、酸化変成澱粉（王子コーンスターテ社
製、エースＡ）６部、スチレン・ブタジエン共重
合体ラテツクス（住友ノーガタツク社製、
SN308）10部、水溶性蛍光増白剤（住友化学社
製、Whitex BB）0.5部及び第１表に記載の如き
各種の増白助剤0.5部を添加して、それぞれ固型
分濃度62％の塗被組成物を得た。
なお、比較例１では蛍光増白剤及び増白助剤の
添加を行わず、比較例２及び比較例３では増白助
剤の添加を行わなかつた。また各実施例及びその
他の比較例で用いた増白助剤は以下の通りであ
る。
●実施例１，２：PVA（クラレ社製、PVA117）
●実施例３：酸変性PVA誘導体（日本合成化学
社製、ゴーセランＦ―78）
●比較例４：アルギン酸ソーダ（三晶社製、ケル
ギンRL）
●比較例５：カルボキシメチルセルロース（第一
工業製薬社製、セロゲン7A）
●比較例６：ヒドロキシエチルセルロース（フジ
ケミカル社製、フジHEC―AL15）
●比較例７：ポリアミドポリ尿素―ホルムアルデ
ヒド樹脂（住友化学社製、SR636）
●比較例８：スチレン無水マレイン酸共重合体
（荒川化学社製、ポリマロン353）
得られた塗被組成物をパイロツトブレードコー
ターで、上記基紙の両面に、片面当たりの乾燥塗
被量が13ｇ／m2になるように塗被し、14.4Kg／
Hr／m2の平均蒸発率で乾燥した後、スーパーカ
レンダー処理をして11種類の塗被紙を製造した。
得られた塗被紙の各種品質を測定して第１表に
記載したが、本発明の実施例で得られた塗被紙の
増白効果は格別に優れており、耐候試験後の黄変
も少なく優れた褪色性を呈していた。
"Industrial Application Field" The present invention relates to a method for producing coated paper, and particularly to a method for producing coated paper that is less likely to fade due to light or heat and has excellent whiteness. ``Conventional technology'' Conventional methods for whitening coated paper include washing the pulp, reducing the amount of high-yield pulp used, adding white filler internally, and adding blue tint using blue dye, all from the base paper surface. Countermeasures have been taken starting with the coating process, in which a coating composition containing white pigments, fluorescent brighteners, dyes, etc. is coated on the surface of the base paper using a size press, coater, etc. Among these whitening measures, the method of using fluorescent whitening agents is commonly used in the paper manufacturing industry as a method to improve the whiteness of printing paper, white paperboard, etc. and increase its commercial value. This is one of the improvement measures. However, water-soluble fluorescent brighteners have a strong affinity for pulp, so when a coating composition powder containing this agent is coated on a base paper, it penetrates into the base paper along with water at the same time as it is coated. Most of it is adsorbed and fixed to the base paper. Therefore, the present situation is that satisfactory results are not necessarily obtained in terms of the whitening effect of the coating layer itself. A method of increasing the whitening effect by using a specific water-soluble polycarboxylate resin and a stilbene-type fluorescent dye in combination [Special Publication No. 48-29802], and a method of using hydroxyethylcellulose with a specific degree of substitution. A method of increasing the whitening effect by using a water-soluble fluorescent brightener together has been proposed [Japanese Patent Publication No. 57-13678], but as mentioned above, certain polyhydric carboxylate resins and hydroxyl Since ethyl cellulose is required, new defects are also created along with the improvement of the whitening effect.
The current situation is that satisfactory results have not been obtained. ``Problems to be Solved by the Invention'' The purpose of the present invention is to provide a method that can extremely efficiently improve the coating layer whitening effect of a water-soluble fluorescent thickener without requiring special materials. It is. "Means for Solving the Problems" The present invention consists of a pigment and an adhesive as main components, 0.05 to 2.5 parts by weight of polyvinyl alcohol or a derivative thereof, and a water-soluble fluorescent whitening agent based on 100 parts by weight of the pigment. A coating composition containing 0.05 to 2 parts by weight of the agent is coated on a base paper, and the average evaporation rate is 10 to 60 Kg/Hr/m 2
This is a method for producing coated paper, which is characterized by drying the coated paper. "Effect" The combined use of polyvinyl alcohol or its derivatives (hereinafter simply referred to as PVA) and a water-soluble fluorescent brightener is known, for example, from the aforementioned Japanese Patent Publication No. 48-29802 and Japanese Patent Publication No. 57-13678. ing. but,
According to these known documents, it is said that even if PVA and a water-soluble fluorescent brightener are used together, no excellent whitening effect can be obtained. However, according to the study results of the present inventors,
By adjusting the amount of PVA used and the drying conditions of the coating composition, the whitening effect of the coating layer can be expressed extremely efficiently, resulting in a coated paper with excellent whiteness and less fading due to light or heat. It became clear that this could be achieved. That is, the present inventors have diligently investigated the whitening effect of coated paper obtained by adding a water-soluble fluorescent brightener and various auxiliaries to a coating composition and drying it under various drying conditions. As a result of research, cellulose derivatives such as sodium alginate, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxymethyl cellulose, methyl cellulose, PVA, polyacrylate resin, styrene maleic acid copolymer salt resin, melamine formaldehyde resin, starch and its derivatives, urea formaldehyde It has become clear that an extremely significant whitening effect can be obtained only when a specific amount of PVA among various auxiliaries is used in the resin and dried under specific drying conditions. It has been reached. Although the cause of this effect is not clear, the inventors' considerations suggest that PVA
shows an excellent fixing effect for water-soluble fluorescent brighteners, which not only prevents the brightener from being adsorbed to the pulp of the base paper, but also prevents the brightener from being adsorbed to the pulp of the base paper. , its usage is set to certain conditions,
In addition, the drying conditions are set to specific conditions, so
The whitening agent migrates to the surface of the coating layer while being fixed, and as a result, the water-soluble fluorescent brightener is efficiently oriented on the surface of the coating layer, resulting in an excellent whitening effect of the coating layer. It is presumed that this is the case. The PVA used in the present invention is not only polyvinyl alcohol obtained by hydrolysis from vinyl acetate polymer, but also polyvinyl alcohol obtained through modification treatments such as esterification, etherification, urethanization, acetalization, crosslinking, and copolymerization. It also includes derivatives such as polyvinyl alcohol. The degree of polymerization of PVA is determined under specific drying conditions.
The polymerization degree is preferably in the range of about 100 to 3,000, particularly in the range of about 200 to 2,000, so that appropriate migration occurs in the coating layer and contributes to the whitening effect.
PVA is preferably used. In addition, the degree of saponification of PVA affects the fixation of the water-soluble fluorescent whitening agent in the coating layer, and the higher the degree of saponification of PVA, the greater the whitening effect, so 20 mol% or more, more preferably 60 mol%
PVA having a saponification degree of above is preferably used. In the present invention, the proportion of PVA used is extremely important, and the amount used is based on 100 parts by weight of the pigment.
If the amount is less than 0.05 part by weight, the desired whitening effect of the present invention cannot be expected. However, when compounded at a high concentration of 3 to 5 parts by weight or more, which is usually used as an adhesive, the coating composition may be damaged due to the shock phenomenon caused by the strong bond between PVA and pigment. Since the viscosity increases and proper migration of PVA in the coated layer during the drying process is inhibited, the desired effect of the present invention is also impaired. Therefore, the usage rate of PVA is
The amount should be adjusted within the range of 0.05 to 2.5 parts by weight, more preferably 0.05 to 1.0 parts by weight, based on 100 parts by weight of the pigment. As mentioned above, the water-soluble fluorescent brighteners to be incorporated into the coating composition of the present invention containing PVA in a specific proportion include stilbene-based brighteners such as diaminostilbene disulfonic acid derivatives commonly used for paper manufacturing. Whitening agents are preferably used, but any water-soluble agent can be used, and of course it is also possible to use two or more types in combination. The proportion of the water-soluble optical brightener used is not particularly limited, but it is generally adjusted within the range of 0.05 to 2 parts by weight, preferably 0.08 to 1 part by weight, per 100 parts by weight of the pigment. desirable. The pigments used in the coating composition are not particularly limited, and include kaolin, hydrated hallosite, clay, heavy carbon calcium, light calcium carbonate, barium sulfate, aluminum hydroxide, satin white, titanium dioxide,
Common pigments for coated paper, such as talc, calcium sulfite, zinc sulfate, and plastic pigments, are appropriately blended depending on the properties of each pigment. Adhesives are also not particularly limited, including casein, soybean protein, yeast protein, starch, oxidized starch, esterified starch, etherified starch, modified starch such as cationic starch, natural adhesives such as cellulose derivatives, etc.
Conjugated diene copolymer latex such as styrene/butadiene copolymer, methyl methacrylate/butadiene copolymer, acrylic polymer latex such as acrylic and/or methacrylic acid ester polymer or copolymer, ethylene/acetic acid Alkali-insensitive synthetic adhesives such as vinyl acetate polymer latex such as vinyl copolymer, and styrene,
Alkali-based emulsions such as alkali-sensitive synthetic resin emulsions whose main components are butadiene and ethylenically unsaturated carboxylic acids, and aqueous emulsions made by blending alkali-insensitive styrene-butadiene copolymer latex with alkali-sensitive copolymer latex. One or more types of common adhesives for coated paper, such as sensitive synthetic adhesives, are appropriately selected and used depending on the purpose of the coated paper. The blending ratio of the adhesive is generally adjusted within the range of 3 to 25 parts by weight per 100 parts by weight of the pigment, but in order to provide excellent smoothness, opacity, white paper gloss, and ink gloss, In order to increase the amount and obtain coated paper with improved printability, it is necessary to
It is desirable to adjust the amount within a range of about 20 parts by weight. In addition, various auxiliary agents, such as dispersants, flow modifiers, antifoaming agents, dyes, lubricants, waterproofing agents, and water retention agents, which are generally added to coated paper compositions, may of course be added as necessary. It is possible. The coating composition thus prepared is coated on one or both sides of the base paper using an on-machine or off-machine coater. Multilayer coating is desirable. In that case, the formulations of the coating compositions for both sides and the coating compositions forming each layer in multilayer coating can be changed as appropriate according to conventional methods. Furthermore, there are no particular limitations on the coating method, including air knife coaters, roll coaters, paddle and inverter type blade coaters with beveled and bent blades,
Furthermore, various conventional coating apparatuses such as various blade coaters such as bill blade, twin blade, short dwell blade, rod blade, and triplex blade coaters can be used as appropriate. Among these various coating devices, blade coaters in particular have traditionally been preferably used to produce high-quality coated paper because they can provide smoother coated surfaces. In the method of the present invention, the specific coating composition thus coated on the base paper is coated with an average evaporation rate of 10 to 60 kg/kg.
It is necessary to dry under specific drying conditions of Hr/ m2 . Generally speaking, there are cylinder dryers, tunnel dryers, floater dryers, air cap dryers, infrared dryers, etc. as drying devices after coating the coating liquid, and their evaporation capacity varies greatly depending on the scale and type of the device. are different. In the present invention, PVA in the coating composition is designed to efficiently migrate to the surface of the coating layer and contribute to the whitening effect on the surface of the coating layer by at least 10 kg/PVA.
It is necessary to dry with an average evaporation rate of Hr/ m2 or higher.
Under drying conditions below 10 Kg/Hr/m 2 , the desired whitening effect of the present invention cannot be expected. However, excessive drying with an average evaporation rate exceeding 60 Kg/Hr/ m2 results in rapid evaporation of water in the coating composition, resulting in rapid and uneven migration of PVA. As a result, the printability of the resulting coated paper deteriorates and uneven printing occurs. Also,
There is also a risk that the surface of the coated layer may become rough or a shaky phenomenon may occur. For this reason, the quality of the coated paper is extremely low. Therefore, in the method of the present invention, it is necessary to dry the coating composition by adjusting the capacity of the drying device so that the average evaporation rate falls within a specific range of 10 to 60 Kg/Hr/ m2 . be. After coating and drying, the coated paper is processed using finishing equipment such as a machine calender, super calender, or gloss calender according to conventional methods to produce a coated paper with excellent white gloss, smoothness, and printability. I can finish it. "Effect" The coated paper of the present invention thus obtained has an extremely efficiently improved whitening effect on the surface of the coating layer,
Moreover, the color difference b expressed by Hunter's chromaticity coordinates is
Since the value tends toward bluishness, fading and yellowing due to light and heat are prevented, and the appearance of blank paper and printed matter shows little change after long-term storage, which is an extremely excellent property. Furthermore, since the whitening effect is remarkable, it is possible to reduce the amount of fluorescent brightener used depending on the purpose of the coated paper, and it is also economically advantageous. "Example" The present invention will be described in more detail with reference to Examples below, but it is of course not limited to these. Note that parts and % in the examples indicate parts by weight and % by weight, respectively, unless otherwise specified. Examples 1 to 3, Comparative Examples 1 to 8 Pulp composition consisting of 50 parts of NBK, 20 parts of LBK, and 30 parts of SGP, 0.5 parts of rosin size, 3 parts of sulfate band,
A base paper for coated paper having a weight of 40 g/m 2 was obtained by adding 0.6 parts of an internal strength agent and 10 parts of talc as a filler. 70 parts of kaolin (manufactured by EMC, UW-90) and heavy calcium carbonate (manufactured by Bihoku Funka Kogyo Co., Ltd., Softon)
2200) was dispersed using 0.2 parts of sodium polyacrylate, 6 parts of oxidized modified starch (manufactured by Oji Cornstarte Co., Ltd., Ace A), and 6 parts of styrene-butadiene copolymer latex (manufactured by Sumitomo Naugatatsu Co., Ltd.).
SN308) 10 parts, 0.5 part of a water-soluble optical brightener (Whitex BB, manufactured by Sumitomo Chemical Co., Ltd.), and 0.5 part of various brightening aids as listed in Table 1 were added to give a solid content concentration of 62%. A coating composition was obtained. Note that in Comparative Example 1, no optical brightener and whitening aid were added, and in Comparative Examples 2 and 3, no brightening aid was added. Further, the whitening aids used in each example and other comparative examples are as follows. ●Examples 1 and 2: PVA (manufactured by Kuraray Co., Ltd., PVA117) ●Example 3: Acid-modified PVA derivative (manufactured by Nippon Gosei Kagaku Co., Ltd., Goselan F-78) ●Comparative example 4: Sodium alginate (manufactured by Sansho Co., Ltd., Kelgin RL) ●Comparative example 5: Carboxymethyl cellulose (Daiichi Kogyo Seiyaku Co., Ltd., Celogen 7A) ●Comparative example 6: Hydroxyethyl cellulose (Fuji Chemical Co., Ltd., Fuji HEC-AL15) ●Comparative example 7: Polyamide polyurea-formaldehyde resin ( Comparative Example 8: Styrene maleic anhydride copolymer (manufactured by Arakawa Chemical Co., Ltd., Polymaron 353) The obtained coating composition was applied to both sides of the base paper using a pilot blade coater, one side at a time. The coating was applied so that the dry coating amount was 13g/ m2 , and
After drying at an average evaporation rate of Hr/m 2 , 11 coated papers were produced by supercalendering. Various qualities of the obtained coated paper were measured and listed in Table 1. The whitening effect of the coated paper obtained in the examples of the present invention was particularly excellent, and the yellowing after the weathering test was It exhibited excellent fading resistance.
【表】【table】
【表】
なお、各種品質試験の内容は以下の通りであ
る。
〔螢光反応〕：下記の評価基準で表示した。
− ＋ ＋＋ ＋＋＋
なし … 〔螢光反応〕 … 強い
〔白色度〕：キセノンランプ（波長457ｍμ）で測
定したエルレホ白色度。
〔ｂ値〕：ハンター色度座標で示した。
（＋程黄味が強く、−程青味が強い）
〔耐候試験〕：３時間アーク放電照射した後の品
質測定結果で示した。
実施例４，５、比較例９〜11
NBKP20部、LBKP80部から成るパルプ組成
に、ロジンサイズ１部、硫酸バンド３部、填料と
してタルク15部を添加して抄紙し、サイズプレス
にて酸化変性澱粉を2.5ｇ／m2塗被して米坪52
ｇ／m2の塗被紙用基紙を得た。
カオリン（EMC社製、UW―90）80部、重質
炭酸カルシウム（富士カオリン社製、カービタル
90）20部をポリアクリル酸ソーダ0.2部を用て分
散し、酸化変性澱粉（王子コーンスターチ社製、
エースＡ）５部、スチレン・ブタジエン共重合体
ラテツクス（住友ノーガタツク社製、SN307）12
部、水溶性螢光増白剤（住友化学社製、Whitex
BK）0.3部、PVA（クラレ社製、PVA117）0.5部
を添加して、固型分濃度60％の塗被組成物を得た
が、比較例９ではPVAの添加を行わなかつた。
得られた塗被組成物をパイロツトプレードコー
ターで、上記基紙の両面に、片面当たりの乾燥塗
被量が16ｇ／m2になるように塗被し、第２表に記
載の如き平均蒸発率で乾燥した後、スーパーカレ
ンダー処理をして５種類の塗被紙を製造した。
得られた塗被紙の各種品質を測定して第２表に
記載したが、本発明の実施例で得られた塗被紙の
増白効果は格別に優れていた。
増白助剤としてのPVAを添加していない比較
例９と乾燥条件が不充分な比較例10では満足すべ
き増白効果が得られず、急激な乾燥を行つた比較
例11では、不均一なPVAのマイグレーシヨンに
よつて、増白効果にムラが発生した。また塗被紙
にボコツキも発生し、印刷後のインキ転移ムラや
印刷平滑性不良が認められた。[Table] The contents of the various quality tests are as follows. [Fluorescence reaction]: Displayed according to the following evaluation criteria. - + ++ +++ None... [Fluorescence reaction]... Strong [whiteness]: Ellejo whiteness measured with a xenon lamp (wavelength 457 mμ). [b value]: Shown in Hunter chromaticity coordinates. (The more yellow the color is +, the more blue the color is blue) [Weather resistance test]: Shown as the quality measurement results after 3 hours of arc discharge irradiation. Examples 4 and 5, Comparative Examples 9 to 11 Paper was made by adding 1 part of rosin size, 3 parts of aluminum sulfate, and 15 parts of talc as a filler to a pulp composition consisting of 20 parts of NBKP and 80 parts of LBKP, and oxidation modification in a size press. Coating 2.5g/ m2 of starch to 52m2
A base paper for coated paper of g/m 2 was obtained. 80 parts of kaolin (manufactured by EMC, UW-90), heavy calcium carbonate (manufactured by Fuji Kaolin, Carbital)
90) Disperse 20 parts of sodium polyacrylate with 0.2 parts of oxidized modified starch (manufactured by Oji Cornstarch Co., Ltd.,
Ace A) 5 parts, styrene-butadiene copolymer latex (manufactured by Sumitomo Naugatatsu Co., Ltd., SN307) 12
Part, water-soluble fluorescent brightener (manufactured by Sumitomo Chemical Co., Ltd., Whitex
A coating composition with a solid content concentration of 60% was obtained by adding 0.3 part of BK) and 0.5 part of PVA (manufactured by Kuraray Co., Ltd., PVA117), but in Comparative Example 9, no PVA was added. The resulting coating composition was coated on both sides of the base paper using a pilot blade coater so that the dry coating amount per side was 16 g/m 2 , and the average evaporation rate as shown in Table 2 was applied. After drying, five types of coated papers were produced by supercalendering. Various qualities of the obtained coated paper were measured and are listed in Table 2, and the whitening effect of the coated paper obtained in the Examples of the present invention was particularly excellent. In Comparative Example 9, in which PVA was not added as a brightening aid, and in Comparative Example 10, in which drying conditions were insufficient, a satisfactory whitening effect could not be obtained, and in Comparative Example 11, in which rapid drying was performed, uneven Due to PVA migration, the whitening effect was uneven. In addition, scratches appeared on the coated paper, and uneven ink transfer and poor printing smoothness after printing were observed.
【表】
実施例６，７、比較例12，13
第３表に示すよう割合で、増白助剤である
PVA（クラレ社製、PVA105）を添加した以外
は、実施例１と同様にして４種類の塗被組成物を
得た。
この塗被組成物をパイロツトブレードコーター
で、実施例１と同じ基紙の両面に、片面当たりの
乾燥塗被量が13ｇ／m2になるように塗被し、11.0
Kg／Hr／m2の平均蒸発率で乾燥した後、スーパ
ーカレンダー処理をして４種類の塗被紙を製造し
た。得られた塗被紙の各種品質を測定して第３表
に記載したが、本発明の実施例で得られた塗被紙
の増白効果は格別に優れており、塗工適性も良好
であつた。[Table] Examples 6 and 7, Comparative Examples 12 and 13 Whitening aids in the proportions shown in Table 3
Four types of coating compositions were obtained in the same manner as in Example 1, except that PVA (manufactured by Kuraray Co., Ltd., PVA105) was added. This coating composition was coated on both sides of the same base paper as in Example 1 using a pilot blade coater so that the dry coating amount per side was 13 g/m 2 .
After drying at an average evaporation rate of Kg/Hr/m 2 , four types of coated papers were produced by supercalendering. Various qualities of the obtained coated paper were measured and listed in Table 3, and the whitening effect of the coated paper obtained in the examples of the present invention was particularly excellent, and the coating suitability was also good. It was hot.
Claims (1)
重量部に対して、ポリビニルアルコール又はその
誘導体を0.05〜2.5重量部、及び水溶性蛍光増白
剤を0.05〜２重量部含有した塗被組成物を基紙に
塗被し、平均蒸発率10〜60Kg／Hr／m2で乾燥す
ることを特徴とする塗被紙の製造方法。1 The main components are pigments and adhesives, and the pigments are 100%
A coating composition containing 0.05 to 2.5 parts by weight of polyvinyl alcohol or a derivative thereof and 0.05 to 2 parts by weight of a water-soluble optical brightener is coated on a base paper, and the average evaporation rate is 10 to 2. A method for producing coated paper characterized by drying at 60Kg/Hr/ m2 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16817085A JPS6228493A (en) | 1985-07-29 | 1985-07-29 | Production of coated paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16817085A JPS6228493A (en) | 1985-07-29 | 1985-07-29 | Production of coated paper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6228493A JPS6228493A (en) | 1987-02-06 |
| JPH0223639B2 true JPH0223639B2 (en) | 1990-05-24 |
Family
ID=15863099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16817085A Granted JPS6228493A (en) | 1985-07-29 | 1985-07-29 | Production of coated paper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6228493A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5713678A (en) * | 1980-06-26 | 1982-01-23 | Matsushita Electric Ind Co Ltd | Electrically heating cooking device |
-
1985
- 1985-07-29 JP JP16817085A patent/JPS6228493A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5713678A (en) * | 1980-06-26 | 1982-01-23 | Matsushita Electric Ind Co Ltd | Electrically heating cooking device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6228493A (en) | 1987-02-06 |
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