JP2012184321A - Aqueous white ink composition - Google Patents
Aqueous white ink composition Download PDFInfo
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- JP2012184321A JP2012184321A JP2011048091A JP2011048091A JP2012184321A JP 2012184321 A JP2012184321 A JP 2012184321A JP 2011048091 A JP2011048091 A JP 2011048091A JP 2011048091 A JP2011048091 A JP 2011048091A JP 2012184321 A JP2012184321 A JP 2012184321A
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- ink composition
- fine particles
- white ink
- titanium oxide
- aqueous
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- 239000000203 mixture Substances 0.000 title claims abstract description 48
- 239000010419 fine particle Substances 0.000 claims abstract description 45
- 229920005989 resin Polymers 0.000 claims abstract description 31
- 239000011347 resin Substances 0.000 claims abstract description 31
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 28
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000007639 printing Methods 0.000 claims abstract description 16
- 239000002245 particle Substances 0.000 claims abstract description 13
- 239000002655 kraft paper Substances 0.000 claims abstract description 9
- 239000011230 binding agent Substances 0.000 claims abstract description 4
- 150000002484 inorganic compounds Chemical class 0.000 claims description 3
- 229910010272 inorganic material Inorganic materials 0.000 claims description 3
- 238000007646 gravure printing Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract 2
- 239000000976 ink Substances 0.000 description 43
- 239000000049 pigment Substances 0.000 description 16
- 239000000123 paper Substances 0.000 description 14
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 239000007787 solid Substances 0.000 description 9
- 238000005299 abrasion Methods 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 238000001556 precipitation Methods 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 6
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 6
- 239000002518 antifoaming agent Substances 0.000 description 5
- 238000009472 formulation Methods 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- 229920000877 Melamine resin Polymers 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229920001909 styrene-acrylic polymer Polymers 0.000 description 4
- 239000001993 wax Substances 0.000 description 4
- GZVHEAJQGPRDLQ-UHFFFAOYSA-N 6-phenyl-1,3,5-triazine-2,4-diamine Chemical compound NC1=NC(N)=NC(C=2C=CC=CC=2)=N1 GZVHEAJQGPRDLQ-UHFFFAOYSA-N 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 239000004640 Melamine resin Substances 0.000 description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 235000012211 aluminium silicate Nutrition 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- MSYLJRIXVZCQHW-UHFFFAOYSA-N formaldehyde;6-phenyl-1,3,5-triazine-2,4-diamine Chemical compound O=C.NC1=NC(N)=NC(C=2C=CC=CC=2)=N1 MSYLJRIXVZCQHW-UHFFFAOYSA-N 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
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000003755 preservative agent Substances 0.000 description 3
- 230000002335 preservative effect Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-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
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 235000019441 ethanol Nutrition 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 2
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 239000008096 xylene Substances 0.000 description 2
- DTCCVIYSGXONHU-CJHDCQNGSA-N (z)-2-(2-phenylethenyl)but-2-enedioic acid Chemical compound OC(=O)\C=C(C(O)=O)\C=CC1=CC=CC=C1 DTCCVIYSGXONHU-CJHDCQNGSA-N 0.000 description 1
- JOLQKTGDSGKSKJ-UHFFFAOYSA-N 1-ethoxypropan-2-ol Chemical compound CCOCC(C)O JOLQKTGDSGKSKJ-UHFFFAOYSA-N 0.000 description 1
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 description 1
- FEIQOMCWGDNMHM-UHFFFAOYSA-N 5-phenylpenta-2,4-dienoic acid Chemical compound OC(=O)C=CC=CC1=CC=CC=C1 FEIQOMCWGDNMHM-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 238000007774 anilox coating Methods 0.000 description 1
- 230000002421 anti-septic effect Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical class C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000004203 carnauba wax Substances 0.000 description 1
- 235000013869 carnauba wax Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- XXJWXESWEXIICW-UHFFFAOYSA-N diethylene glycol monoethyl ether Chemical compound CCOCCOCCO XXJWXESWEXIICW-UHFFFAOYSA-N 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- POLCUAVZOMRGSN-UHFFFAOYSA-N dipropyl ether Chemical compound CCCOCCC POLCUAVZOMRGSN-UHFFFAOYSA-N 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 1
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000012258 stirred mixture Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920005792 styrene-acrylic resin Polymers 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000001038 titanium pigment Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Landscapes
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
Description
本発明は、優れた白濃度を有し、かつ、グラビア印刷やフレキソ印刷におけるドクターブレードやスリッター加工における刃の磨耗や沈殿の低減に優れた水性白インキ組成物に関する。 The present invention relates to a water-based white ink composition having an excellent white density and excellent in reducing wear and precipitation of a doctor blade in gravure printing and flexographic printing and blade processing in slitter processing.
環境保護の観点から、印刷原紙における再生紙の占める割合は、年々、高まっている。一方、段ボールや紙袋の分野では、価格の観点から、未漂白の原紙に下地として、白インキを印刷、その上に色インキを印刷して絵柄を印刷する構成が増えている。 From the viewpoint of environmental protection, the proportion of recycled paper in printing base paper is increasing year by year. On the other hand, in the field of corrugated cardboard and paper bags, from the viewpoint of price, there is an increasing configuration in which a white ink is printed on an unbleached base paper as a base, and a color ink is printed thereon to print a pattern.
しかし、再生紙を含んだ原紙では、繊維が短いことや凹凸が大きいこと、浸透性が高いこと等が原因となり、原紙本来の色相の隠蔽が難しくなってきている。 However, in the base paper including recycled paper, it is difficult to conceal the original hue of the base paper due to short fibers, large irregularities, high permeability, and the like.
従来、グラビア印刷やフレキソ印刷で使用する白インキは、酸化チタンとそれ以外の金属の酸化物や水酸化物、硫酸塩や炭酸塩等の粒子状を配合し、高い隠蔽性を得る技術があった。しかし、これらの無機化合物は、硬度が高いものがある為、印刷時のドクターブレードやスリット加工時の刃の磨耗性が高く頻繁な交換が必要となる問題があった。 Conventionally, white ink used in gravure printing and flexographic printing has a technology to obtain high hiding properties by blending particles of titanium oxide and other metal oxides and hydroxides, sulfates and carbonates. It was. However, since these inorganic compounds have high hardness, there is a problem that doctor blades at the time of printing and blades at the time of slit processing have high wear resistance and require frequent replacement.
本発明は、クラフト紙やＫライナー紙等の着色原紙上で、優れた白濃度が得られ、かつ、グラビア印刷やフレキソ印刷におけるドクターブレードやスリッター加工時の刃の耐摩耗性に優れた水性白インキを提供することにある。 The present invention is a water-based white having excellent white density obtained on colored base paper such as kraft paper and K liner paper, and excellent abrasion resistance of doctor blades and slitters in gravure printing and flexographic printing. To provide ink.
発明者らは、鋭意検討を行った結果、特定の酸化チタンおよび有機微粒子を含有させた水性白インキが、クラフト紙やＫライナー紙等の着色原紙上で、優れた白濃度が得られ、かつ、グラビア印刷やフレキソ印刷におけるドクターブレードやスリッター加工時の刃の耐摩耗性に優れることを見出し、本発明を完成するに至った。 As a result of intensive studies, the inventors have obtained a white aqueous ink containing a specific titanium oxide and organic fine particles on a colored base paper such as kraft paper or K liner paper, and The present inventors have found that the wear resistance of the doctor blade and the blade during slitting is excellent in gravure printing and flexographic printing, and completed the present invention.
すなわち、本発明は、酸化チタン、有機微粒子、バインダー樹脂および水を含有している水性白インキ組成物であって、
酸化チタンが、
インキ組成物全量に対して、３５〜５０重量％
含まれ、
有機微粒子が、
インキ組成物全量に対して、１〜５重量％
含まれ、かつ
モース硬度４以下
および
平均粒子径５〜１５μｍ
であることを特徴とする水性白インキ組成物に関するものである。
That is, the present invention is a water-based white ink composition containing titanium oxide, organic fine particles, a binder resin and water,
Titanium oxide
35 to 50% by weight based on the total amount of the ink composition
Included,
Organic fine particles
1 to 5% by weight based on the total amount of the ink composition
Included and
Mohs hardness 4 or less
and
Average particle size 5-15μm
The present invention relates to a water-based white ink composition.
また、本発明は、前記水性白インキ組成物が、さらに、酸化チタンを除くモース硬度４以下の無機化合物を１〜１０重量％含むことを特徴とする上記の水性白インキ組成物に関するものである。 In addition, the present invention relates to the aqueous white ink composition described above, wherein the aqueous white ink composition further contains 1 to 10% by weight of an inorganic compound having a Mohs hardness of 4 or less excluding titanium oxide. .
さらに、本発明は、上記の水性白インキ組成物をクラフト紙に印刷してなる印刷物に関するものである。 Furthermore, this invention relates to the printed matter formed by printing said aqueous white ink composition on kraft paper.
本発明により、酸化チタン顔料と有機微粒子組み合わせることにより、無機微粒子使用時と同等の高い白濃度とドクターブレードやスリッター加工時の刃の磨耗の低減を両立した水性白インキ組成物を得ることができる。 According to the present invention, by combining the titanium oxide pigment and the organic fine particles, it is possible to obtain a water-based white ink composition that achieves both a high white density equivalent to that when using inorganic fine particles and a reduction in wear of the blade during doctor blade and slitter processing. .
本発明において使用する酸化チタン顔料としては、一般的なインキまたは、塗料用ものを使用することができる。酸化チタンは、結晶型がルチル型であることが望ましく、酸化アルミニウムによる処理度が、５％未満であることが好ましい。アナターゼ型では、隠蔽性が得られにくく、酸化アルミニウムの処理度が５％を超えるとインキの安定性やドクターブレードの耐磨耗性が低下するので、本発明においては、好ましくない。 As the titanium oxide pigment used in the present invention, a general ink or paint can be used. The titanium oxide desirably has a rutile crystal form, and the degree of treatment with aluminum oxide is preferably less than 5%. In the anatase type, it is difficult to obtain concealability, and if the treatment degree of aluminum oxide exceeds 5%, the stability of the ink and the wear resistance of the doctor blade are lowered, which is not preferable in the present invention.
酸化チタン顔料の含有量は、３５〜５０重量％が必要である。３５重量％より少ないと充分な白濃度が得られず、５０重量％を超えると、粘度上昇や沈殿が発生する。この為、酸化チタン顔料の含有量は、４０〜４５重量％とすることがより好ましい。 The content of the titanium oxide pigment needs to be 35 to 50% by weight. When the amount is less than 35% by weight, a sufficient white density cannot be obtained. When the amount exceeds 50% by weight, viscosity increase and precipitation occur. For this reason, the content of the titanium oxide pigment is more preferably 40 to 45% by weight.
本発明において使用する有機微粒子としては、モース硬度が４以下であることが必要である。有機微粒子としては、ベンゾグアナミン樹脂、メラミン樹脂、ホルムアルデヒド縮合物、ビニル系、ウレタン系、アクリル酸系、メタクリル酸系、尿素系の硬化型樹脂微粒子等が挙げられるが、この内ベンゾグアナミン樹脂、メラミン樹脂または、ホルムアルデヒド縮合物合物を使用することが好ましい。アクリル系や、メタクリル系では、モース硬度が４より大きく、ドクターブレードの耐摩耗性が低下しやすい為、本発明においては、適用できない。有機微粒子は、インキ組成物全量に対して、１〜５重量％必要であり、１重量％より少ないと、ドクターブレードの耐摩耗性が低下し、５重量％より多いと、インキ組成物の粘度安定性と沈殿性が低下しやすくなる。 The organic fine particles used in the present invention are required to have a Mohs hardness of 4 or less. Examples of the organic fine particles include benzoguanamine resin, melamine resin, formaldehyde condensate, vinyl-based, urethane-based, acrylic acid-based, methacrylic acid-based, urea-based curable resin fine particles, among which benzoguanamine resin, melamine resin or It is preferable to use a formaldehyde condensate compound. In the case of acrylic or methacrylic, the Mohs hardness is larger than 4, and the wear resistance of the doctor blade is likely to be lowered, so that it cannot be applied in the present invention. The organic fine particles are required to be 1 to 5% by weight with respect to the total amount of the ink composition. If the amount is less than 1% by weight, the wear resistance of the doctor blade is lowered, and if it is more than 5% by weight, the viscosity of the ink composition is decreased. Stability and precipitation are likely to decrease.
有機微粒子の平均粒子径は、５〜１５μｍが好ましく、平均粒子径が５μｍより小さいと、有機微粒子の沈殿傾向が強くなり、ドクターブレードの耐磨耗性が低下する。平均粒子径が、１５μｍより大きいと隠蔽性が低下する。有機微粒子としては、株式会社日本触媒より、エポスターシリーズ（ベンゾグアナミン樹脂、メラミン樹脂とホルムアルデヒドの縮合樹脂微粒子）、エポスターＭＡシリーズ（メタクリル酸系樹脂微粒子）が市販されている。 The average particle diameter of the organic fine particles is preferably 5 to 15 μm. If the average particle diameter is smaller than 5 μm, the tendency of the organic fine particles to precipitate increases and the wear resistance of the doctor blade decreases. When the average particle size is larger than 15 μm, the concealability is lowered. As the organic fine particles, Eposter series (benzoguanamine resin, condensed resin fine particles of melamine resin and formaldehyde) and Eposter MA series (methacrylic acid resin fine particles) are commercially available from Nippon Shokubai Co., Ltd.
本発明において使用するバインダー樹脂としては、アルカリ可溶型水性樹脂、エマルジョン型水性樹脂または、これらを組み合わせて使用することができる。アルカリ可溶型樹脂としては、スチレン−アクリル酸系樹脂、スチレン−マレイン酸系樹脂、ポリウレタン系樹脂等が挙げられ、エマルジョン型水性樹脂としては、スチレン−アクリル系樹脂、ポリウレタン系樹脂、スチレン−ブタジエン系樹脂、酢酸ビニル系樹脂等が挙げられ、顔料分散には、アルカリ可溶型水性樹脂の樹脂を用いることが好ましく、これによって得られた顔料分散物は、エマルジョン型水性樹脂を用いて、調整することが、塗膜確保の目的で、より好ましい。 As the binder resin used in the present invention, an alkali-soluble aqueous resin, an emulsion-type aqueous resin, or a combination thereof can be used. Examples of alkali-soluble resins include styrene-acrylic acid resins, styrene-maleic acid resins, polyurethane resins, and the like. Emulsion-type aqueous resins include styrene-acrylic resins, polyurethane resins, styrene-butadienes. Resin, vinyl acetate resin, and the like, and it is preferable to use an alkali-soluble aqueous resin for pigment dispersion, and the pigment dispersion obtained thereby is prepared using an emulsion-type aqueous resin. It is more preferable for the purpose of securing the coating film.
本発明において使用する無機微粒子としては、酸化チタンを除いた、タルク、炭酸カルシウム、カオリン、硫酸バリウム、シリカ等、鉱物系や各種金属の酸化物、炭酸塩、硫酸塩が挙げられ、好ましくはモース硬度４以下の無機微粒子であり、これらを有機微粒子と併用することにより、酸化チタン顔料の使用量を減らしても、高い白濃度が得られる。無機微粒子は、インキ組成物全量に対して、１〜１０重量％使用し、１重量％より少ないと、ドクターブレードの耐摩耗性が低下し、１０重量％より多いと沈殿が発生しやすくなる。酸化チタン顔料の使用量を減らす目的で、５〜１０重量％使用することが、より好ましい。 Examples of the inorganic fine particles used in the present invention include minerals and oxides of various metals such as talc, calcium carbonate, kaolin, barium sulfate, silica, etc., carbonate and sulfate, excluding titanium oxide, preferably Mohs. Inorganic fine particles having a hardness of 4 or less. By using these in combination with organic fine particles, a high white density can be obtained even if the amount of titanium oxide pigment used is reduced. The inorganic fine particles are used in an amount of 1 to 10% by weight based on the total amount of the ink composition. If the amount is less than 1% by weight, the wear resistance of the doctor blade is lowered, and if it is more than 10% by weight, precipitation tends to occur. In order to reduce the amount of titanium oxide pigment used, it is more preferable to use 5 to 10% by weight.
インキの製造においては、有機微粒子は、酸化チタンと樹脂との練肉時に使用、あるいは調整時に使用することができる。また、酸化チタンを除く無機微粒子を併用する場合は、練肉時にいずれかの微粒子を使用しても、あるいは一括して使用してもよい。 In the production of ink, the organic fine particles can be used at the time of kneading and adjusting titanium oxide and resin. When inorganic fine particles excluding titanium oxide are used in combination, any fine particles may be used at the time of grinding, or may be used collectively.
本発明における、水性白インキ組成物には、溶剤、その他目的に応じた助剤を使用することができる。 In the aqueous white ink composition of the present invention, a solvent and other auxiliary agents depending on the purpose can be used.
溶剤としては水単独または水と混合する有機溶剤を使用することができる。有機溶剤としては、例えばメチルアルコール、エチルアルコール、イソプロピルアルコール、ｎ−プロピルアルコール等のアルコール類やプロピレングリコール、グリセリン等の多価アルコール類、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、プロピレングリコールモノｎ−プロピルエーテル、エチルカルビトール等のエーテル類等がある。 As the solvent, water alone or an organic solvent mixed with water can be used. Examples of the organic solvent include alcohols such as methyl alcohol, ethyl alcohol, isopropyl alcohol and n-propyl alcohol, polyhydric alcohols such as propylene glycol and glycerin, propylene glycol monomethyl ether, propylene glycol monoethyl ether, and propylene glycol mono n. -Ethers such as propyl ether and ethyl carbitol.
その他の助剤成分としては、酸化チタン顔料や有機および、無機微粒子の濡れ性の向上、沈殿の防止、光沢の付与する為の、各種界面活性剤や顔料分散剤、耐摩擦性、滑り性等を付与するためのパラフィン系ワックス、ポリエチレン系ワックス、カルナバワックス等のワックス類やオレイン酸アミド、ステアリン酸アミド、エルカ酸アミド等の脂肪酸アミド類および印刷時の発泡を抑制するためのシリコン系、非シリコン系消泡剤を適宜使用することもできる。 Other auxiliary components include titanium oxide pigments and various surfactants and pigment dispersants for improving wettability of organic and inorganic fine particles, prevention of precipitation, and gloss, friction resistance, slipping properties, etc. Waxes such as paraffin wax, polyethylene wax, carnauba wax, and fatty acid amides such as oleic acid amide, stearic acid amide, erucic acid amide, etc. Silicon-based antifoaming agents can also be used as appropriate.
本発明に係わる水性印刷インキ組成物は、グラビア、フレキソ印刷インキの製造に一般的に使用されているアイガーミル、サンドミル、ガンマミル、アトライター等を用いて製造される。 The aqueous printing ink composition according to the present invention is produced using an Eiger mill, a sand mill, a gamma mill, an attritor or the like generally used for the production of gravure and flexographic printing inks.
本発明に係わる水性白インキ組成物は、一般に使用されている印刷方式、即ちグラビア印刷、フレキソ印刷等によりクラフト紙やＫライナー紙等の着色原紙に印刷することができる。 The water-based white ink composition according to the present invention can be printed on colored base paper such as kraft paper or K liner paper by a commonly used printing method, that is, gravure printing, flexographic printing or the like.
なお、平均粒子径は、（株）堀場製作所製 レーザー回折／散乱式粒度分布測定装置ＬＡ−９２０型を用い、各試料を分散媒にて希釈後、透過率（Ｌ）（Ｈ）を９０−９５％になるよう調整し、ペーストセル法にて測定した。 The average particle size was measured by using a laser diffraction / scattering type particle size distribution analyzer LA-920 manufactured by Horiba, Ltd., and diluting each sample with a dispersion medium, and then transmitting (L) (H) to 90-. It adjusted to 95% and measured by the paste cell method.
以下、本発明を実施例により説明する。本発明において、特に断らない限り、「部」は、「重量部」であり、「％」は、「重量％」である。 Hereinafter, the present invention will be described with reference to examples. In the present invention, “part” is “part by weight” and “%” is “% by weight” unless otherwise specified.
なお、実施例、比較例で用いた酸化チタン顔料、有機微粒子および無機微粒子は下記の通りである。
酸化チタン顔料・・テイカ製チタニックスＪＲ８００
有機微粒子Ａ・・・株式会社日本触媒製エポスターＭ０５。ベンゾグアナミン・ホル ムアルデヒド縮合、モース硬度２．０、平均粒子径５μｍ。
有機微粒子Ｂ・・・株式会社日本触媒製エポスターＬ１５。ベンゾグアナミン・ホル ムアルデヒド縮合樹脂、モース硬度２．０、平均粒子径１２．０μｍ。
有機微粒子Ｃ・・・日本触媒製エポスターＭＳ。ベンゾグアナミン・ホルムアルデヒ ド縮合樹脂モース硬度２．０、平均粒子径２μｍ。
有機微粒子Ｄ・・・日本触媒製エポスターＭＡ１０１０。ポリメタクリル酸樹脂、 モース硬度７．０、平均粒子径１０μｍ。
無機微粒子Ａ・・・堺化学工業製バリエースＢ３５。硫酸バリウム、
モース硬度３．０。
無機微粒子Ｂ・・・林化成製カオリンクレーＡＳＰ１００。カオリン、
モース硬度２．５。
無機微粒子Ｃ・・・白石カルシウム製炭酸カルシウムＰＣ、炭酸カルシウム、
モース硬度３．０。
無機微粒子Ｄ・・・富士シリシア化学製サイリシア４３５、シリカ、
モース硬度７．０
無機微粒子Ｅ・・・河合石灰工業製セラシュールＢＭＴ−Ｂ、酸化アルミニウム、
モース硬度９．０
In addition, the titanium oxide pigment, organic fine particles, and inorganic fine particles used in Examples and Comparative Examples are as follows.
Titanium oxide pigment ・ Titanic JR800
Organic fine particle A ... Nippon Shokubai Co., Ltd. Eposter M05. Benzoguanamine-formaldehyde condensation, Mohs hardness 2.0, average particle size 5 μm.
Organic fine particle B ... Nippon Shokubai Co., Ltd. poster L15. Benzoguanamine-formaldehyde condensation resin, Mohs hardness 2.0, average particle size 12.0 μm.
Organic fine particle C ... Nippon Shokubai's eposter MS. Benzoguanamine-formaldehyde condensation resin Mohs hardness 2.0, average particle size 2 μm.
Organic fine particle D ... Nippon Shokubai Eposta MA1010. Polymethacrylic resin, Mohs hardness 7.0, average particle size 10 μm.
Inorganic fine particles A: Variace B35 manufactured by Sakai Chemical Industry. Barium sulfate,
Mohs hardness 3.0.
Inorganic fine particle B ... Kaolin clay ASP100 manufactured by Hayashi Kasei. Kaolin,
Mohs hardness 2.5.
Inorganic fine particles C: Calcium carbonate PC, calcium carbonate made of Shiroishi calcium,
Mohs hardness 3.0.
Inorganic fine particles D: Silicia 435 manufactured by Fuji Silysia Chemical, silica,
Mohs hardness 7.0
Inorganic fine particles E: Cerasur BMT-B manufactured by Kawai Lime Industry, aluminum oxide,
Mohs hardness 9.0
（アルカリ可溶型水性樹脂の合成）
攪拌装置、温度計、滴下漏斗および、還流冷却器、窒素吹込み管を備えた四つ口フラスコにキシレン１５００重量部を仕込み、内温が１２５〜１３０℃になるまで、昇温した。次いで、スチレン６００重量部、メタクリル酸メチル３００部、メタクリル酸６００部および、ジ−ｔｅｒｔ−ブチルパーオキサイド６５部からなる混合液を滴下漏斗より、４時間を要して滴下した後、同温度を３時間保ち、重合反応を完結させた。更に、１８０℃に昇温し、減圧下でキシレンを完全に除去し、重量平均分子量が２４,０００、数平均分子量１８,０００、酸価２５０ｍｇ／KOHの共重合物を得た。得られた共重合物にアンモニア水および、イオン交換水を加えて、ｐH８．５、固形分３０．０％のスチレン−アクリル酸共重合物の水溶液（Ａ）を得た。
(Synthesis of alkali-soluble aqueous resin)
Into a four-necked flask equipped with a stirrer, thermometer, dropping funnel, reflux condenser, and nitrogen blowing tube, 1500 parts by weight of xylene was charged, and the temperature was raised until the internal temperature reached 125 to 130 ° C. Next, a mixture of 600 parts by weight of styrene, 300 parts of methyl methacrylate, 600 parts of methacrylic acid and 65 parts of di-tert-butyl peroxide was dropped from the dropping funnel over 4 hours, and then the same temperature was applied. The polymerization reaction was completed for 3 hours. Furthermore, the temperature was raised to 180 ° C., and xylene was completely removed under reduced pressure to obtain a copolymer having a weight average molecular weight of 24,000, a number average molecular weight of 18,000 and an acid value of 250 mg / KOH. Ammonia water and ion exchange water were added to the obtained copolymer to obtain an aqueous solution (A) of a styrene-acrylic acid copolymer having a pH of 8.5 and a solid content of 30.0%.
（エマルジョン型水性樹脂の合成）
温度計、攪拌機、還流冷却器、窒素ガス吹き込み管を備えた四つ口フラスコに、上記で得たスチレン−アクリル酸共重合物の水溶液、イオン交換水各３００重量部を反応フラスコに仕込み、温度を８０〜８２℃に上げた後、過硫酸カリウムを８重量部部添加し、メタクリル酸メチル３５０部、２−エチルヘキシルアクリレート３５０部の混合物を２時間かけて滴下した。滴下終了後、更に、過硫酸カリウムを２重量部添加し、２時間反応させ、イオン交換水で固形分を調整、固形分４５％のスチレン−アクリル系エマルジョン型水性樹脂 （Ｂ）を得た。
(Synthesis of emulsion-type aqueous resin)
Into a four-necked flask equipped with a thermometer, a stirrer, a reflux condenser, and a nitrogen gas blowing tube, each 300 parts by weight of the aqueous solution of styrene-acrylic acid copolymer obtained above and ion-exchanged water was charged into a reaction flask, Was raised to 80-82 ° C., 8 parts by weight of potassium persulfate was added, and a mixture of 350 parts of methyl methacrylate and 350 parts of 2-ethylhexyl acrylate was added dropwise over 2 hours. After completion of the dropwise addition, 2 parts by weight of potassium persulfate was further added and reacted for 2 hours. The solid content was adjusted with ion-exchanged water to obtain a styrene-acrylic emulsion type aqueous resin (B) having a solid content of 45%.
〔実施例１〕
スチレン−アクリル酸共重合物の水溶液（Ａ） １４．０部
（酸価２５０ｍｇＫＯＨ／ｇ、固形分３０％、ｐH８．５、）
酸化チタン顔料 ４５．０部
ポリエチレンワックス分散物（固形分４０％） ２．０部
ノニオン型顔料分散剤（固形分１００％） ２．０部
水 １０．０部
合 計 ７３．０部
を配合、攪拌混合後、サンドミルで分散し、ミルベース（１）とする。これに、以下の通り、スチレン−アクリル系エマルジョン型水性樹脂（Ｂ）と有機微粒子、消泡剤、防腐剤および、水を加え、ザーンカップNo.４、２０秒の水性白インキ組成物（１）を得た。
ミルベース（１） ７３．０部
スチレン−アクリル系エマルジョン型水性樹脂（Ｂ） ２０．０部
有機微粒子Ａ ２．０部 消泡剤 ０．２部
防腐剤 ０．２部
水 ４．６部
合 計 １００．０部
[Example 1]
Aqueous solution of styrene-acrylic acid copolymer (A) 14.0 parts (acid value 250 mg KOH / g, solid content 30%, pH 8.5)
Titanium oxide pigment 45.0 parts Polyethylene wax dispersion (solid content 40%) 2.0 parts Nonionic pigment dispersant (solid content 100%) 2.0 parts
Blending water 10.0 parts Total 73.0 parts, after stirring and mixing, and dispersed with a sand mill, a mill base (1). To this, styrene-acrylic emulsion type aqueous resin (B), organic fine particles, antifoaming agent, preservative and water were added as follows, and Zahn Cup No. 4, 20 seconds aqueous white ink composition (1 )
Mill base (1) 73.0 parts Styrene-acrylic emulsion type aqueous resin (B) 20.0 parts Organic fine particles A 2.0 parts Antifoam 0.2 parts Preservative 0.2 parts
Water 4.6 parts Total 100.0 parts
〔実施例２〜４〕
実施例２〜４については、表１の配合に従い、実施例１と同様の方法で、水性白インキ組成物（２）〜（４）を得た。
[Examples 2 to 4]
For Examples 2 to 4, aqueous white ink compositions (2) to (4) were obtained in the same manner as in Example 1 according to the formulation in Table 1.
〔実施例５〕
スチレン−アクリル酸共重合物の水溶液（Ａ） １４．０部
（酸価２５０ｍｇＫＯＨ／ｇ、固形分３０％、ｐH８．５、）
酸化チタン顔料 ３７．０部
無機微粒子Ａ（硫酸バリウム、モース硬度３．０） ８．０部
ポリエチレンワックス分散物（固形分４０％） ２．０部
ノニオン型顔料分散剤（固形分１００％） ２．０部
水 ９．０部
合 計 ７２．０部
を配合、攪拌混合後、サンドミルで分散し、ミルベース（５）とする。これに、以下の通り、エマルジョン型水性樹脂（Ｂ）と有機微粒子、消泡剤、防腐剤および、水を加え、ザーンカップNo.４、２０秒の水性白インキ組成物（５）を得た。
ミルベース（５） ７２．０部
スチレン−アクリル系エマルジョン型水性樹脂（Ｂ） ２０．０部
有機微粒子Ｂ ２．０部
消泡剤 ０．２部
防腐剤 ０．２部
水 ５．６部
合 計 １００．０部
Example 5
Aqueous solution of styrene-acrylic acid copolymer (A) 14.0 parts (acid value 250 mg KOH / g, solid content 30%, pH 8.5)
Titanium oxide pigment 37.0 parts Inorganic fine particles A (barium sulfate, Mohs hardness 3.0) 8.0 parts Polyethylene wax dispersion (solid content 40%) 2.0 parts Nonionic pigment dispersant (solid content 100%) 2 .0 part
Blending 9.0 parts Total 72.0 parts of water, stirred mixture was dispersed in a sand mill, a mill base (5). To this, an emulsion-type aqueous resin (B) and organic fine particles, an antifoaming agent, an antiseptic and water were added as follows to obtain a Zahn cup No. 4, a 20-second aqueous white ink composition (5). .
Mill base (5) 72.0 parts Styrene-acrylic emulsion type aqueous resin (B) 20.0 parts Organic fine particle B 2.0 parts Antifoam 0.2 parts Preservative 0.2 parts
Water 5.6 parts Total 100.0 parts
〔実施例６、７〕
実施例６、７については、表１の配合に従い、実施例５と同様の方法で、水性白インキ組成物（６）および、（７）を得た。
[Examples 6 and 7]
For Examples 6 and 7, aqueous white ink compositions (6) and (7) were obtained in the same manner as in Example 5 according to the formulation in Table 1.
〔比較例１〕
比較例１については、表１の配合に従い、実施例１と同様の方法で、水性白インキ組成物（i）を得た。
[Comparative Example 1]
For Comparative Example 1, an aqueous white ink composition (i) was obtained in the same manner as in Example 1 according to the formulation in Table 1.
〔比較例２〜５〕
比較例２〜５については、表１の配合に従い、比較例１と同様の方法で、水性白インキ組成物（ii）〜（v）を得た。
[Comparative Examples 2 to 5]
For Comparative Examples 2 to 5, aqueous white ink compositions (ii) to (v) were obtained in the same manner as in Comparative Example 1 according to the formulation in Table 1.
〔比較例６、７〕
比較例６、７については、表１の配合に従い、実施例５と同様の方法で、水性白インキ組成物（vi）および（vii）を得た。
[Comparative Examples 6 and 7]
For Comparative Examples 6 and 7, aqueous white ink compositions (vi) and (vii) were obtained in the same manner as in Example 5 according to the formulation in Table 1.
以上実施例および比較例の水性白インキ組成物を水で希釈し、インキ粘度をＮｏ４．ザーンカップで１２〜１３秒に調整する。これら各水性白インキ組成物を坪量６０ｇ／ｍ２のクラフト紙にフレキソ印刷（アニロックスロール１６５線／ｃｍ、セル容積２５．０ｃｍ３／ｍ２）し、各々の印刷物を得た。この各インキについては１）粘度安定性、２）沈殿性、３）耐磨耗性、また各印刷物については４）白濃度を評価した。その結果を表１に示す。なお、評価方法およびその判定基準は以下の通りである。 The aqueous white ink compositions of Examples and Comparative Examples were diluted with water, and the ink viscosity was No.4. Adjust to 12-13 seconds with Zaan Cup. Each of these aqueous white ink compositions was flexographically printed (anilox roll 165 lines / cm, cell volume 25.0 cm <3> / m <2>) on kraft paper having a basis weight of 60 g / m <2> to obtain each printed matter. For each ink, 1) viscosity stability, 2) precipitation, 3) abrasion resistance, and 4) white density were evaluated for each printed matter. The results are shown in Table 1. In addition, the evaluation method and its criterion are as follows.
＜評価方法および判定基準＞
１）粘度安定性：各インキを４０℃の保温庫で、１週間保存したインキを２５℃まで冷却
し、Ｎｏ４ザーンカップにて、粘度測定する。
判定基準：◎粘度上昇が、仕上がり時粘度の２秒未満、
○粘度上昇が、仕上がり時粘度の２秒から５秒
△粘度上昇が、仕上がり時粘度の５秒から１０秒
×粘度上昇が、仕上がり時粘度の１０秒以上
２）沈殿性：各インキ１００mlをガラス瓶に入れ、４０℃の保温庫で、１週間保存したイ ンキを２５℃まで冷却し、瓶の底部の沈殿物の高さを測定する。
判定基準：◎沈殿物の高さが、３ｍｍ未満。
○沈殿物の高さが、３ｍｍから５ｍｍ。
△沈殿物の高さが、５ｍｍから７ｍｍ。
×沈殿物の高さが、７ｍｍ以上。
<Evaluation methods and criteria>
1) Viscosity stability: Each ink was stored for 1 week in a 40 ° C. heat-reserving chamber, cooled to 25 ° C., and the viscosity was measured with a No. 4 Zahn cup.
Criteria: ◎ Viscosity increase is less than 2 seconds of finished viscosity,
○ Increase in viscosity is 2 to 5 seconds of finished viscosity
△ Viscosity increase is 5 to 10 seconds of finished viscosity
X Increase in viscosity is 10 seconds or more of finished viscosity 2) Precipitation: Put 100 ml of each ink in a glass bottle, cool the ink stored for one week in a 40 ° C incubator to 25 ° C, and precipitate at the bottom of the bottle Measure the height of the object.
Judgment criteria: The height of the precipitate is less than 3 mm.
○ The height of the precipitate is 3 mm to 5 mm.
ΔThe height of the precipitate is 5 mm to 7 mm.
X The height of the precipitate is 7 mm or more.
３）耐磨耗性：各インキを水で、印刷粘度（Ｎｏ４．ザーンカップ１２〜１３秒）に希釈 したものを使用し、アブラージョンテスター（１００,０００回転）により、スチー ル製ドクターの磨耗量を測定。
判定基準：◎磨耗量が、２ｍｇ未満。
○磨耗量が、２ｍｇから５ｍｇ。
△磨耗量が、５ｍｇから８ｍｇ。
×磨耗量が、８ｍｇ以上。
４）白濃度：各インキのクラフト紙印刷物のL値を測定する。
判定基準：◎L値が、８０以上
○L値が、７５から８０
△L値が、７０から７５
×L値が、７０未満
3) Abrasion resistance: Each ink was diluted with water to a printing viscosity (No. 4. Zahn cup 12-13 seconds), and the abrasion of the steel doctor was measured with an abrasion tester (100,000 rotations). Measure quantity.
Criteria: ◎ Abrasion amount is less than 2 mg.
○ Abrasion amount is 2mg to 5mg.
ΔWear amount is 5 to 8 mg.
X Wear amount is 8 mg or more.
4) White density: L value of kraft paper print of each ink is measured.
Criteria: ◎ L value is 80 or more
○ L value is 75 to 80
△ L value is 70 to 75
× L value is less than 70
以上の結果から、酸価チタン顔料と、モース硬度４以下の有機微粒子を含む水性白インキ組成物または、該白インキ組成物にモース硬度４以下の無機微粒子を含む水性白インキ組成物を用いることにより、フレキソ印刷やグラビア印刷におけるドクターブレードの耐摩耗性が向上し、且つ、クラフト紙やＫライナー紙等の着色原紙上で、良好な白濃度の確保が可能である。 From the above results, an aqueous white ink composition containing an acid value titanium pigment and organic fine particles with a Mohs hardness of 4 or less, or an aqueous white ink composition containing inorganic fine particles with a Mohs hardness of 4 or less in the white ink composition is used. Thus, the abrasion resistance of the doctor blade in flexographic printing and gravure printing is improved, and a good white density can be secured on colored base paper such as kraft paper or K liner paper.
Claims (3)
酸化チタンが、
インキ組成物全量に対して、３５〜５０重量％
含まれ、
有機微粒子が、
インキ組成物全量に対して、１〜５重量％
含まれ、かつ
モース硬度４以下
および
平均粒子径５〜１５μｍ
であることを特徴とする水性白インキ組成物。 A water-based white ink composition containing titanium oxide, organic fine particles, a binder resin and water,
Titanium oxide
35 to 50% by weight based on the total amount of the ink composition
Included,
Organic fine particles
1 to 5% by weight based on the total amount of the ink composition
Included and
Mohs hardness 4 or less
and
Average particle size 5-15μm
A water-based white ink composition characterized by the above.
A printed matter obtained by printing the aqueous white ink composition according to claim 1 or 2 on kraft paper.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2014166713A (en) * | 2013-02-28 | 2014-09-11 | Fuji Tokushu Shigyo Kk | Multicolor printing method for soft packaging resin film, printing apparatus for the same and multicolor print |
| JP2014227455A (en) * | 2013-05-21 | 2014-12-08 | サカタインクス株式会社 | Aqueous white ink composition for flexographic printing |
| WO2019208704A1 (en) * | 2018-04-27 | 2019-10-31 | 三菱ケミカル株式会社 | Water-based ink |
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2011
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014166713A (en) * | 2013-02-28 | 2014-09-11 | Fuji Tokushu Shigyo Kk | Multicolor printing method for soft packaging resin film, printing apparatus for the same and multicolor print |
| JP2014227455A (en) * | 2013-05-21 | 2014-12-08 | サカタインクス株式会社 | Aqueous white ink composition for flexographic printing |
| WO2019208704A1 (en) * | 2018-04-27 | 2019-10-31 | 三菱ケミカル株式会社 | Water-based ink |
| CN111836862A (en) * | 2018-04-27 | 2020-10-27 | 三菱化学株式会社 | Water-based ink |
| JPWO2019208704A1 (en) * | 2018-04-27 | 2021-02-12 | 三菱ケミカル株式会社 | Water-based ink |
| JP7460520B2 (en) | 2018-04-27 | 2024-04-02 | 三菱ケミカル株式会社 | water based ink |
| WO2022130549A1 (en) * | 2020-12-17 | 2022-06-23 | Ｄｉｃグラフィックス株式会社 | Liquid printing ink, printed matter, and layered body |
| JP7093461B1 (en) | 2021-12-13 | 2022-06-29 | 大日精化工業株式会社 | Water-based ink composition for front printing and articles with printing layer |
| JP2023087437A (en) * | 2021-12-13 | 2023-06-23 | 大日精化工業株式会社 | Water-based ink compositions for surface printing and articles with printing layer |
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