JP6027714B2 - Method for producing pigment dispersion for printing ink composition - Google Patents
Method for producing pigment dispersion for printing ink composition Download PDFInfo
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- JP6027714B2 JP6027714B2 JP2012261168A JP2012261168A JP6027714B2 JP 6027714 B2 JP6027714 B2 JP 6027714B2 JP 2012261168 A JP2012261168 A JP 2012261168A JP 2012261168 A JP2012261168 A JP 2012261168A JP 6027714 B2 JP6027714 B2 JP 6027714B2
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- printing ink
- ink composition
- pigment
- printing
- calcium carbonate
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- 238000007639 printing Methods 0.000 title claims description 266
- 239000000203 mixture Substances 0.000 title claims description 247
- 239000000049 pigment Substances 0.000 title claims description 142
- 239000006185 dispersion Substances 0.000 title claims description 100
- 238000004519 manufacturing process Methods 0.000 title claims description 29
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 132
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 66
- 239000002966 varnish Substances 0.000 claims description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 49
- 239000012860 organic pigment Substances 0.000 claims description 48
- 238000004898 kneading Methods 0.000 claims description 26
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 25
- 229930195729 fatty acid Natural products 0.000 claims description 25
- 239000000194 fatty acid Substances 0.000 claims description 25
- 150000004665 fatty acids Chemical class 0.000 claims description 22
- 239000007787 solid Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 description 32
- 239000003921 oil Substances 0.000 description 31
- 235000019198 oils Nutrition 0.000 description 31
- 229920005989 resin Polymers 0.000 description 29
- 239000011347 resin Substances 0.000 description 29
- 239000002245 particle Substances 0.000 description 25
- 230000000052 comparative effect Effects 0.000 description 16
- -1 fatty acid ester compound Chemical class 0.000 description 13
- 235000015112 vegetable and seed oil Nutrition 0.000 description 13
- 239000008158 vegetable oil Substances 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 12
- 239000002612 dispersion medium Substances 0.000 description 11
- 239000002904 solvent Substances 0.000 description 11
- 239000004606 Fillers/Extenders Substances 0.000 description 10
- 238000011156 evaluation Methods 0.000 description 10
- 238000002156 mixing Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 238000007645 offset printing Methods 0.000 description 9
- 239000000843 powder Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 238000011010 flushing procedure Methods 0.000 description 7
- 235000010187 litholrubine BK Nutrition 0.000 description 7
- 239000003549 soybean oil Substances 0.000 description 7
- 235000012424 soybean oil Nutrition 0.000 description 7
- 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 6
- 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 6
- 239000002480 mineral oil Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 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 6
- 229910052791 calcium Inorganic materials 0.000 description 5
- 238000004040 coloring Methods 0.000 description 5
- 239000003208 petroleum Substances 0.000 description 5
- 239000012071 phase Substances 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 238000010008 shearing Methods 0.000 description 5
- 239000013522 chelant Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical class [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 229920000180 alkyd Polymers 0.000 description 3
- 239000008346 aqueous phase Substances 0.000 description 3
- 235000010446 mineral oil Nutrition 0.000 description 3
- 239000005011 phenolic resin Substances 0.000 description 3
- XDOFQFKRPWOURC-UHFFFAOYSA-N 16-methylheptadecanoic acid Chemical compound CC(C)CCCCCCCCCCCCCCC(O)=O XDOFQFKRPWOURC-UHFFFAOYSA-N 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- 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 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- MQQXUGFEQSCYIA-OAWHIZORSA-M aluminum;(z)-4-ethoxy-4-oxobut-2-en-2-olate;propan-2-olate Chemical compound [Al+3].CC(C)[O-].CC(C)[O-].CCOC(=O)\C=C(\C)[O-] MQQXUGFEQSCYIA-OAWHIZORSA-M 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 229940059904 light mineral oil Drugs 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 150000002989 phenols Chemical class 0.000 description 2
- 238000011085 pressure filtration Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 150000004671 saturated fatty acids Chemical class 0.000 description 2
- 229920002050 silicone resin Polymers 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 2
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 2
- 239000001052 yellow pigment Substances 0.000 description 2
- CUXYLFPMQMFGPL-UHFFFAOYSA-N (9Z,11E,13E)-9,11,13-Octadecatrienoic acid Natural products CCCCC=CC=CC=CCCCCCCCC(O)=O CUXYLFPMQMFGPL-UHFFFAOYSA-N 0.000 description 1
- OYHQOLUKZRVURQ-NTGFUMLPSA-N (9Z,12Z)-9,10,12,13-tetratritiooctadeca-9,12-dienoic acid Chemical compound C(CCCCCCC\C(=C(/C\C(=C(/CCCCC)\[3H])\[3H])\[3H])\[3H])(=O)O OYHQOLUKZRVURQ-NTGFUMLPSA-N 0.000 description 1
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- ULQISTXYYBZJSJ-UHFFFAOYSA-N 12-hydroxyoctadecanoic acid Chemical compound CCCCCCC(O)CCCCCCCCCCC(O)=O ULQISTXYYBZJSJ-UHFFFAOYSA-N 0.000 description 1
- KIHBGTRZFAVZRV-UHFFFAOYSA-N 2-Hydroxyoctadecanoic acid Natural products CCCCCCCCCCCCCCCCC(O)C(O)=O KIHBGTRZFAVZRV-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 235000019485 Safflower oil Nutrition 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- AOADSHDCARXSGL-ZMIIQOOPSA-M alkali blue 4B Chemical compound CC1=CC(/C(\C(C=C2)=CC=C2NC2=CC=CC=C2S([O-])(=O)=O)=C(\C=C2)/C=C/C\2=N\C2=CC=CC=C2)=CC=C1N.[Na+] AOADSHDCARXSGL-ZMIIQOOPSA-M 0.000 description 1
- CUXYLFPMQMFGPL-SUTYWZMXSA-N all-trans-octadeca-9,11,13-trienoic acid Chemical compound CCCC\C=C\C=C\C=C\CCCCCCCC(O)=O CUXYLFPMQMFGPL-SUTYWZMXSA-N 0.000 description 1
- DTOSIQBPPRVQHS-PDBXOOCHSA-N alpha-linolenic acid Chemical compound CC\C=C/C\C=C/C\C=C/CCCCCCCC(O)=O DTOSIQBPPRVQHS-PDBXOOCHSA-N 0.000 description 1
- 235000020661 alpha-linolenic acid Nutrition 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- SMZOGRDCAXLAAR-UHFFFAOYSA-N aluminium isopropoxide Chemical compound [Al+3].CC(C)[O-].CC(C)[O-].CC(C)[O-] SMZOGRDCAXLAAR-UHFFFAOYSA-N 0.000 description 1
- CEGOLXSVJUTHNZ-UHFFFAOYSA-K aluminium tristearate Chemical compound [Al+3].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CEGOLXSVJUTHNZ-UHFFFAOYSA-K 0.000 description 1
- 229940063655 aluminum stearate Drugs 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- POJOORKDYOPQLS-UHFFFAOYSA-L barium(2+) 5-chloro-2-[(2-hydroxynaphthalen-1-yl)diazenyl]-4-methylbenzenesulfonate Chemical compound [Ba+2].C1=C(Cl)C(C)=CC(N=NC=2C3=CC=CC=C3C=CC=2O)=C1S([O-])(=O)=O.C1=C(Cl)C(C)=CC(N=NC=2C3=CC=CC=C3C=CC=2O)=C1S([O-])(=O)=O POJOORKDYOPQLS-UHFFFAOYSA-L 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000000828 canola oil Substances 0.000 description 1
- 235000019519 canola oil Nutrition 0.000 description 1
- 239000004359 castor oil Substances 0.000 description 1
- 235000019438 castor oil Nutrition 0.000 description 1
- PZTQVMXMKVTIRC-UHFFFAOYSA-L chembl2028348 Chemical compound [Ca+2].[O-]S(=O)(=O)C1=CC(C)=CC=C1N=NC1=C(O)C(C([O-])=O)=CC2=CC=CC=C12 PZTQVMXMKVTIRC-UHFFFAOYSA-L 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 description 1
- 235000012343 cottonseed oil Nutrition 0.000 description 1
- 239000002385 cottonseed oil Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000010727 cylinder oil Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 125000000664 diazo group Chemical group [N-]=[N+]=[*] 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 229940097789 heavy mineral oil Drugs 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 229960004488 linolenic acid Drugs 0.000 description 1
- KQQKGWQCNNTQJW-UHFFFAOYSA-N linolenic acid Natural products CC=CCCC=CCC=CCCCCCCCC(O)=O KQQKGWQCNNTQJW-UHFFFAOYSA-N 0.000 description 1
- 239000000944 linseed oil Substances 0.000 description 1
- 235000021388 linseed oil Nutrition 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 235000021313 oleic acid Nutrition 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 235000005713 safflower oil Nutrition 0.000 description 1
- 239000003813 safflower oil Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000003784 tall oil Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 239000002383 tung oil Substances 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Landscapes
- Inks, Pencil-Leads, Or Crayons (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
Description
本発明は、印刷インキ組成物用顔料分散体の製造方法、印刷インキ組成物用顔料分散体及びその製造方法により調製された印刷インキ組成物用顔料分散体を含んでなる印刷インキ組成物に関する。 The present invention relates to a method for producing a pigment dispersion for a printing ink composition, a pigment dispersion for a printing ink composition, and a printing ink composition comprising the pigment dispersion for a printing ink composition prepared by the production method.
オフセット印刷は、油性である印刷インキ組成物が水に反発する性質を利用した印刷方式であり、凹凸を備える印刷版を用いる凸版印刷方式とは異なり、凹凸のない印刷版を用いることを特徴とした印刷方式である。この印刷版は、凹凸の代わりに親油性の画像部と親水性の非画像部とを備え、印刷に際して、まず、印刷版に供給された湿し水によって非画像部が湿潤される。すると、油性である印刷インキ組成物が印刷版に供給された際に、当該印刷インキ組成物は、湿し水で湿潤されて水分を帯びた非画像部には反発して付着せず、親油性の画像部のみに付着する。こうして、印刷版の表面に印刷インキ組成物による画像が形成され、その印刷インキ組成物による画像がブランケット及び紙に順次転移することにより印刷が行われる。 Offset printing is a printing method that utilizes the property that an oil-based printing ink composition repels water, and is different from a relief printing method that uses a printing plate with unevenness, and is characterized by using a printing plate without unevenness. Printing method. This printing plate is provided with an oleophilic image portion and a hydrophilic non-image portion in place of the unevenness, and at the time of printing, the non-image portion is first wetted by dampening water supplied to the printing plate. Then, when the oil-based printing ink composition is supplied to the printing plate, the printing ink composition does not repel and adhere to the non-image area wetted with dampening water and has moisture. It adheres only to the oily image area. Thus, an image of the printing ink composition is formed on the surface of the printing plate, and printing is performed by sequentially transferring the image of the printing ink composition to the blanket and paper.
また、上記のように湿し水を用いたオフセット印刷の他に、シリコーン樹脂により非画像部が形成された印刷版を用いた水無しオフセット印刷方式も実用化されている。この印刷方式では、湿し水が印刷インキ組成物と反発して非画像部を形成するのではなく、シリコーン樹脂が印刷インキ組成物と反発して非画像部となる。こうした点を除けば、水無しオフセット印刷もまた、上記のように湿し水を用いたオフセット印刷と共通の印刷方式である。そこで、本明細書では、湿し水を用いた印刷方式のみならず、水無し印刷方式をも含めた概念として「オフセット印刷」という用語を用いる。なお、水無しオフセット印刷では、湿し水による印刷インキ組成物の乳化が起こらないので、ドットゲインの小さな高品位印刷を行うことができるとされている。 In addition to offset printing using fountain solution as described above, a waterless offset printing method using a printing plate on which a non-image part is formed of a silicone resin has been put into practical use. In this printing method, the fountain solution does not repel the printing ink composition to form a non-image part, but the silicone resin repels the printing ink composition to form a non-image part. Except for these points, offset printing without water is also a printing method common to offset printing using dampening water as described above. Therefore, in this specification, the term “offset printing” is used as a concept including not only a printing method using dampening water but also a waterless printing method. In waterless offset printing, since the printing ink composition is not emulsified by the fountain solution, high-quality printing with a small dot gain can be performed.
オフセット印刷のうち、新聞印刷や電話帳印刷等のように高速かつ大量に印刷することが要求される分野では、オフセット輪転機が使用されるのが一般的である。オフセット輪転機では、印刷用紙を巻き取りの状態で用紙供給部に装着し、この巻き取りを巻き解くことで印刷用紙を印刷部へ供給し印刷を行う。印刷された印刷用紙は、裁断部で裁断を受けた後、折り加工等の必要な加工を受けて製品となる。このような印刷方法によれば、数万部から数十万部程度の印刷を一度に行うことができるので効率的である。そして、その印刷速度も１時間あたり、１０万部以上という高速に達することもある。 Of offset printing, offset rotary presses are generally used in fields that require high-speed and large-volume printing such as newspaper printing and telephone directory printing. In the offset rotary press, the printing paper is mounted on the paper supply unit in a wound state, and the winding is unwound to supply the printing paper to the printing unit for printing. The printed printing paper is cut by a cutting unit and then subjected to necessary processing such as folding and becomes a product. According to such a printing method, printing of about tens of thousands to hundreds of thousands of copies can be performed at a time, which is efficient. The printing speed may reach as high as 100,000 copies per hour.
このような高速印刷により多量の印刷物を得る場合、印刷部数の増加に伴って印刷機上で様々な障害を生じることがある。このような障害の一例として、印刷部数の増加に伴って粘つきの強い状態に変質した印刷インキ組成物が印刷機のローラーに溜まる「ねっぱり」現象や、印刷機において回転するローラーとローラーとの間で印刷インキ組成物が付着分裂する際に、印刷インキ組成物が糸を引き、この糸が延びきって切れた際に糸を構成していた印刷インキ組成物が微粒子となって飛び散り周辺を汚してしまう「ミスチング」現象を挙げることができる。印刷インキ組成物の性能としてこれらの障害の発生の少ないことが常に要求されており、少しでもこれらの発生を抑制できる製品が必要とされている。このような背景から、印刷インキ組成物の高速印刷適性を改善するための各種の取り組みが行われている（一例として、特許文献１を参照）。 When a large amount of printed matter is obtained by such high-speed printing, various obstacles may occur on the printing machine as the number of printed copies increases. As an example of such an obstacle, a “sticky” phenomenon in which a printing ink composition that has been changed to a sticky state with an increase in the number of printed copies accumulates on a roller of a printing press, or between a roller and a roller that rotates in a printing press. When the printing ink composition adheres and breaks between the two, the printing ink composition pulls the thread, and when the thread extends and breaks, the printing ink composition constituting the thread becomes fine particles and scatters around the periphery. A “misting” phenomenon can be mentioned. The performance of the printing ink composition is always required to be low in the occurrence of these obstacles, and there is a need for a product that can suppress these occurrences as little as possible. Against this background, various efforts have been made to improve the high-speed printability of printing ink compositions (see Patent Document 1 as an example).
ところで、オフセット印刷に用いられる印刷インキ組成物は、バインダーとなる樹脂を植物油等の油成分により溶解又は分散させた印刷インキ組成物用ワニスを分散媒として、着色顔料や体質顔料等の顔料成分を分散させて調製される。これらの顔料を分散媒に分散させるに際して、顔料成分と分散媒とを混ぜ合わせた混合物を調製し、この混合物を三本ロールミルやビーズミル等の分散機により混練し、その際のせん断力によって顔料成分を分散媒中に分散させる方法と、水系で合成された顔料成分を加圧濾過により水を絞って得られる湿った状態の顔料プレスケーキを分散媒中に投入し、これらをニーダー等の混練機で混練することにより、顔料成分の周囲に残留する水分を分散媒に含まれる油成分で置換させて顔料成分を分散媒中に分散させる方法（フラッシング法）とが知られている。なお、これらの方法により分散される顔料成分は、印刷インキ組成物に着色力を付与する着色顔料と、印刷インキ組成物に適正な粘弾性や各種特性を付与する炭酸カルシウム等の体質顔料とに大きく分類されるが、いずれの種類の顔料成分であっても、これらの方法により分散させることについては違いがない。 By the way, the printing ink composition used for offset printing uses a varnish for a printing ink composition in which a resin serving as a binder is dissolved or dispersed in an oil component such as vegetable oil as a dispersion medium, and a pigment component such as a color pigment or an extender pigment. Prepared by dispersing. When dispersing these pigments in the dispersion medium, a mixture is prepared by mixing the pigment component and the dispersion medium, and this mixture is kneaded by a disperser such as a three-roll mill or a bead mill, and the pigment component is obtained by shearing force at that time. And a wet pigment press cake obtained by squeezing water by pressure filtration of a pigment component synthesized in an aqueous system, and the kneading machine such as a kneader. Is known in which a water component remaining around the pigment component is replaced by an oil component contained in the dispersion medium to disperse the pigment component in the dispersion medium (flushing method). The pigment component dispersed by these methods includes a coloring pigment that imparts coloring power to the printing ink composition and an extender pigment such as calcium carbonate that imparts appropriate viscoelasticity and various characteristics to the printing ink composition. Although it is classified broadly, there is no difference in dispersing any kind of pigment component by these methods.
両分散方法にはそれぞれ一長一短がある。前者は、水系等で合成された顔料成分を完全に乾燥させて粒子の状態としたものを原料として用いるので、運搬時に顔料成分が軽量かつ小さな体積となって輸送に要する費用を抑制できる反面、完全に乾燥した顔料粒子同士が強固に凝集しているため微粒子化させて分散させる際に多量のエネルギーと時間を要することになる。また、後者は、水系で合成された顔料成分から水分を絞り、ある程度水分の残ったプレスケーキの状態としたものを原料として用いるので、運搬時に顔料成分が重くかつ大きな体積となって輸送に要する費用がかさむ反面、顔料を完全に乾燥させないので顔料粒子同士の凝集が少なく微粒子化させて分散させる際のエネルギーと時間を少なくできる。 Both dispersion methods have advantages and disadvantages. In the former, since the pigment component synthesized in an aqueous system or the like is completely dried and used as a raw material, the pigment component is light and small in volume at the time of transportation. Since the completely dried pigment particles are strongly aggregated, a large amount of energy and time are required for fine particle dispersion. In the latter, water is squeezed from a pigment component synthesized in an aqueous system and used as a raw material in the form of a press cake with a certain amount of moisture remaining. Therefore, the pigment component is heavy and has a large volume during transportation and is required for transportation. Although the cost is high, since the pigment is not completely dried, the aggregation and dispersion of the pigment particles are reduced, and the energy and time for dispersing the particles can be reduced.
このような背景から、本願の出願人により、完全に乾燥させて粒子の状態とした炭酸カルシウム等の体質顔料に水等の湿潤剤を加えてこれを湿潤させ、その上で分散媒と混練することで顔料分散体を調製することが提案されている（特許文献２〜５を参照）。このような手法を用いることにより、原料となる顔料成分の運搬時には、水分を含まない状態として輸送に要する費用を抑制しつつ、顔料成分を分散媒に分散させる際には、凝集した顔料粒子を湿潤により解した状態として分散に要するエネルギーや時間を節約し、印刷インキ組成物の生産性を高めることが可能になる。 From such a background, the applicant of the present application adds a wetting agent such as water to an extender pigment such as calcium carbonate that has been completely dried to form particles, which is moistened, and then kneaded with a dispersion medium. It has been proposed to prepare a pigment dispersion (see Patent Documents 2 to 5). By using such a method, when the pigment component as a raw material is transported, the aggregated pigment particles are dispersed when the pigment component is dispersed in the dispersion medium while suppressing the cost required for transportation as a moisture-free state. It is possible to save energy and time required for dispersion as a state solved by wetting, and to increase the productivity of the printing ink composition.
特許文献２〜５に記載された手法を用いて印刷インキ組成物用顔料分散体を調製することにより、印刷適性の優れた印刷インキ組成物を良好な生産性で製造することが可能となる。しかしながら、オフセット輪転機を用いた高速印刷は現在も発展を続ける分野であり、上記のような「ねっぱり」現象や「ミスチング」現象を少しでも抑制することのできる製品が常に求められているのもまた現状である。 By preparing a pigment dispersion for a printing ink composition using the methods described in Patent Documents 2 to 5, it is possible to produce a printing ink composition having excellent printability with good productivity. However, high-speed printing using an offset rotary press is a field that continues to develop, and there is always a need for products that can suppress the above-mentioned “tickling” and “misting” phenomena. Is also the current situation.
本発明は、以上の状況に鑑みてなされたものであり、良好な生産性を維持しながら、生産された印刷インキ組成物における「ねっぱり」現象や、「ミスチング」現象等といった障害の発生を抑制することのできる印刷インキ組成物用顔料分散体の製造方法、並びにそのような製造方法で得られた印刷インキ組成物用顔料分散体及びそれを用いた印刷インキ組成物を提供することを目的とする。 The present invention has been made in view of the above situation, and while maintaining good productivity, the occurrence of obstacles such as a “stickiness” phenomenon and a “misting” phenomenon in the produced printing ink composition. An object of the present invention is to provide a method for producing a pigment dispersion for a printing ink composition capable of being suppressed, a pigment dispersion for a printing ink composition obtained by such a production method, and a printing ink composition using the same. And
本発明者らは、上記課題を解決するために鋭意検討を重ねた結果、脂肪酸により表面処理された粉末状の炭酸カルシウムと有機顔料のプレスケーキとを印刷インキ組成物用ワニス中に加え、これらを混練して体質顔料である炭酸カルシウムと着色顔料である有機顔料とを一緒に印刷インキ組成物用ワニス中に分散させて印刷インキ組成物用顔料分散体を調製することにより、意外にも、良好な生産性を維持したまま、得られた印刷インキ組成物用顔料分散体を用いて調製された印刷インキ組成物が、上記のような「ねっぱり」現象や「ミスチング」現象の発生の少ないものとなることを見出し、本発明を完成するに至った。具体的には、本発明は以下のようなものを提供する。 As a result of intensive studies to solve the above problems, the present inventors added powdered calcium carbonate surface-treated with a fatty acid and an organic pigment press cake to the varnish for a printing ink composition. Surprisingly, by preparing a pigment dispersion for a printing ink composition by kneading and dispersing calcium carbonate as an extender pigment and an organic pigment as a coloring pigment together in a varnish for a printing ink composition, While maintaining good productivity, the printing ink composition prepared using the obtained pigment dispersion for printing ink composition is less likely to cause the above-mentioned “stickiness” phenomenon and “misting” phenomenon. As a result, the present invention has been completed. Specifically, the present invention provides the following.
本発明は、脂肪酸により表面処理された粉末状の炭酸カルシウム、水を含んだ有機顔料のプレスケーキ、及び印刷インキ組成物用ワニスを含む混合物を混練し、上記炭酸カルシウム及び有機顔料を上記印刷インキ組成物用ワニス中に分散させる混練工程と、上記水を除去する水除去工程と、を含む印刷インキ組成物用顔料分散体の製造方法である。 The present invention kneads a mixture containing powdery calcium carbonate surface-treated with a fatty acid, an organic pigment press cake containing water, and a varnish for a printing ink composition, and the calcium carbonate and the organic pigment are mixed with the printing ink. It is a manufacturing method of the pigment dispersion for printing ink compositions including the kneading | mixing process disperse | distributed in the varnish for compositions, and the water removal process of removing the said water.
上記製造方法において、上記炭酸カルシウム、及び上記有機顔料の固形分の合計に対して、上記炭酸カルシウムの量を６６質量％以下にすることが好ましい。 In the said manufacturing method, it is preferable that the quantity of the said calcium carbonate shall be 66 mass% or less with respect to the sum total of the solid content of the said calcium carbonate and the said organic pigment.
本発明によれば、良好な生産性を維持しながら、生産された印刷インキ組成物における「ねっぱり」現象や、「ミスチング」現象等といった障害の発生を抑制することのできる印刷インキ組成物用顔料分散体の製造方法、並びにそのような製造方法で得られた印刷インキ組成物用顔料分散体及びそれを用いた印刷インキ組成物が提供される。 According to the present invention, for a printing ink composition that can suppress the occurrence of obstacles such as a “stickiness” phenomenon and a “misting” phenomenon in the produced printing ink composition while maintaining good productivity. Provided are a method for producing a pigment dispersion, a pigment dispersion for a printing ink composition obtained by such a production method, and a printing ink composition using the same.
以下、本発明の印刷インキ組成物用顔料分散体の製造方法の一実施態様、並びに印刷インキ組成物用顔料分散体及び印刷インキ組成物の一実施形態について説明する。なお、本発明は、以下の実施態様及び実施形態に限定されるものではなく、本発明の範囲において適宜変更を加えて実施することができる。 Hereinafter, an embodiment of a method for producing a pigment dispersion for a printing ink composition of the present invention and an embodiment of a pigment dispersion for a printing ink composition and a printing ink composition will be described. The present invention is not limited to the following embodiments and embodiments, and can be implemented with appropriate modifications within the scope of the present invention.
＜印刷インキ組成物用顔料分散体の製造方法＞
本発明の印刷インキ組成物用顔料分散体の製造方法は、脂肪酸により表面処理された粉末状の炭酸カルシウム、水を含んだ有機顔料のプレスケーキ、及び印刷インキ組成物用ワニスを含む混合物を混練し、上記炭酸カルシウム及び有機顔料を上記印刷インキ組成物用ワニス中に分散させる混練工程と、上記水を除去する水除去工程と、を含む。この製造方法により調製された印刷インキ組成物用顔料分散体は、印刷インキ組成物の調製における中間原料として好ましく用いられる。以下、各工程について説明する。
<Method for producing pigment dispersion for printing ink composition>
The method for producing a pigment dispersion for a printing ink composition of the present invention comprises kneading a mixture containing powdered calcium carbonate surface-treated with a fatty acid, an organic pigment press cake containing water, and a varnish for the printing ink composition And a kneading step for dispersing the calcium carbonate and the organic pigment in the varnish for a printing ink composition, and a water removing step for removing the water. The pigment dispersion for a printing ink composition prepared by this production method is preferably used as an intermediate material in the preparation of the printing ink composition. Hereinafter, each step will be described.
［混練工程］
まず、混練工程について説明する。この工程では、脂肪酸により表面処理された粉末状の炭酸カルシウム、水を含んだ有機顔料のプレスケーキ、及び印刷インキ組成物用ワニスを含む混合物を混練し、上記炭酸カルシウム及び有機顔料を上記印刷インキ組成物用ワニス中に分散させる。まずは、各原料について説明する。
[Kneading process]
First, the kneading process will be described. In this step, a mixture containing powdered calcium carbonate surface-treated with a fatty acid, an organic pigment press cake containing water, and a varnish for a printing ink composition is kneaded, and the calcium carbonate and the organic pigment are mixed with the printing ink. Disperse in the composition varnish. First, each raw material will be described.
脂肪酸により表面処理された粉末状の炭酸カルシウムは、親水性である未処理の炭酸カルシウム粒子の表面に脂肪酸を結合させることにより、その表面が改質された炭酸カルシウムの粉末である。このような炭酸カルシウムは、例えば、水系に分散された炭酸カルシウムのスラリーに脂肪酸を添加して表面処理させる手段や、アルコール等といった適切な溶剤に脂肪酸を溶解させて溶液とし、当該溶液を未処理の炭酸カルシウムの粉末に加え、次いで溶媒を減圧留去させる手段等により得られる。表面処理される未処理の炭酸カルシウムの粉末は、天然の石灰石を破砕して得られる重質炭酸カルシウムであってもよいし、水系で化学合成されたコロイド炭酸カルシウムであってもよい。表面処理に用いる脂肪酸としては、ステアリン酸等を挙げることができるが、特に限定されない。炭酸カルシウムの一次粒子の粒径としては、２０ｎｍ〜２００ｎｍ程度を例示することができるが、特に限定されない。脂肪酸により表面処理された粉末状の炭酸カルシウムは、印刷インキ組成物における体質顔料として用いられる成分であり、分散媒である印刷インキ組成物用ワニス中に分散されることにより印刷インキ組成物に対して良好な粘弾性特性を付与する。 The powdery calcium carbonate surface-treated with a fatty acid is a calcium carbonate powder whose surface has been modified by binding the fatty acid to the surface of hydrophilic untreated calcium carbonate particles. Such calcium carbonate is, for example, a means for adding a fatty acid to a slurry of calcium carbonate dispersed in an aqueous system for surface treatment, or by dissolving the fatty acid in a suitable solvent such as alcohol to form a solution, and then treating the solution untreated In addition to the calcium carbonate powder, the solvent is then distilled off under reduced pressure. The untreated calcium carbonate powder to be surface-treated may be heavy calcium carbonate obtained by crushing natural limestone, or colloidal calcium carbonate chemically synthesized in an aqueous system. Examples of fatty acids used for the surface treatment include stearic acid, but are not particularly limited. The particle diameter of the primary particles of calcium carbonate can be exemplified by about 20 nm to 200 nm, but is not particularly limited. Powdered calcium carbonate surface-treated with a fatty acid is a component used as an extender pigment in a printing ink composition, and is dispersed in a varnish for a printing ink composition, which is a dispersion medium, to the printing ink composition. Give good viscoelastic properties.
脂肪酸により表面処理された粉末状の炭酸カルシウムは、市販品であってもよい。このような市販品としては、白艶華ＣＣ、白艶華Ｕ、白艶華ＣＣＲ、Ｖｉｇｏｔ１０、Ｖｉｇｏｔ１５（いずれも白石カルシウム株式会社製の商品名である。）等を例示できる。 A commercial product may be sufficient as the powdery calcium carbonate surface-treated with the fatty acid. Examples of such commercially available products include white gloss flower CC, white gloss flower U, white gloss flower CCR, Vigot 10 and Vigot 15 (all are trade names manufactured by Shiroishi Calcium Co., Ltd.).
印刷インキ組成物用顔料分散体における炭酸カルシウムの含有量としては、２．５〜３０質量％が好ましく例示され、５〜２５質量％がより好ましく例示され、７．５〜２０質量％がさらに好ましく例示される。印刷インキ組成物用顔料分散体における炭酸カルシウムの含有量が上記の範囲であることにより、印刷インキ組成物用顔料分散体の適用された印刷インキ組成物の粘弾性が適切な範囲となり、ミスチングの発生を抑制できるので好ましい。また、印刷インキ組成物用顔料分散体において、炭酸カルシウム及び後述する有機顔料の固形分の合計に対して、炭酸カルシウムの含有量が６６質量％以下であることが好ましい。印刷インキ組成物用顔料分散体において、炭酸カルシウム及び後述する有機顔料の固形分の合計に対して、炭酸カルシウムの含有量が６６質量％以下であることにより、後述する有機顔料及び炭酸カルシウムの良好な分散性が得られるので好ましい。そこで、混練工程では、印刷インキ組成物用顔料分散体における炭酸カルシウムの含有量が上記のような条件を満たすように、脂肪酸により表面処理された粉末状の炭酸カルシウムの配合量を決定することが好ましい。 The content of calcium carbonate in the pigment dispersion for a printing ink composition is preferably 2.5 to 30% by mass, more preferably 5 to 25% by mass, and further preferably 7.5 to 20% by mass. Illustrated. When the content of calcium carbonate in the pigment dispersion for printing ink composition is in the above range, the viscoelasticity of the printing ink composition to which the pigment dispersion for printing ink composition is applied becomes an appropriate range, and misting Since generation | occurrence | production can be suppressed, it is preferable. In the pigment dispersion for a printing ink composition, the content of calcium carbonate is preferably 66% by mass or less with respect to the total solid content of calcium carbonate and an organic pigment described later. In the pigment dispersion for a printing ink composition, the content of calcium carbonate is 66% by mass or less with respect to the total solid content of calcium carbonate and the organic pigment described later. It is preferable because a good dispersibility is obtained. Therefore, in the kneading step, the blending amount of the powdered calcium carbonate surface-treated with a fatty acid may be determined so that the calcium carbonate content in the pigment dispersion for a printing ink composition satisfies the above conditions. preferable.
水を含んだ有機顔料のプレスケーキは、水系で析出物として合成された有機顔料から加圧濾過で水分を絞り、ある程度水分の残った状態で固形物とされたものである。このような有機顔料では、有機顔料粒子の周囲に水分が付着した状態となっていて有機顔料粒子同士の凝集が抑制されるので、プレスケーキを完全に乾燥させて得られる粉末状の有機顔料よりも凝集が少ない状態となっている。そのため、水を含んだ有機顔料のプレスケーキは、後述する印刷インキ組成物用ワニスとともに混練されると、有機顔料の周囲に存在する水相が印刷インキ組成物用ワニスに含まれる油成分により油相に転換され、高い分散性を有する顔料分散体となる。なお、有機顔料の周囲に存在する水相を油相に転換させて有機顔料の分散体を得る操作はフラッシングと呼ばれ、当業者に周知の手法である。有機顔料のプレスケーキに含まれる有機顔料の固形分量としては、２０〜８０質量％程度を例示できるが、特に限定されない。 A water-containing organic pigment press cake is obtained by squeezing moisture from an organic pigment synthesized as a precipitate in an aqueous system by pressure filtration to form a solid with some moisture remaining. In such an organic pigment, since moisture is attached around the organic pigment particles and aggregation of the organic pigment particles is suppressed, the powdery organic pigment obtained by completely drying the press cake is used. Is in a state of little aggregation. Therefore, when an organic pigment presscake containing water is kneaded with a varnish for a printing ink composition, which will be described later, an aqueous phase present around the organic pigment is oiled by an oil component contained in the varnish for a printing ink composition. It is converted into a phase and becomes a pigment dispersion having high dispersibility. The operation of converting the aqueous phase present around the organic pigment to the oil phase to obtain a dispersion of the organic pigment is called flushing, and is a technique well known to those skilled in the art. The solid content of the organic pigment contained in the organic pigment press cake can be exemplified by about 20 to 80% by mass, but is not particularly limited.
プレスケーキの状態で用いられる有機顔料は、印刷インキ組成物に着色力を与えるための成分（すなわち着色顔料）である。このような有機顔料としては、従来から印刷インキ組成物に用いられているものを特に制限無く挙げることができる。 The organic pigment used in the state of the press cake is a component (that is, a coloring pigment) for imparting coloring power to the printing ink composition. Examples of such organic pigments include those conventionally used in printing ink compositions without any particular limitation.
このような有機顔料としては、ジスアゾイエロー（ピグメントイエロー１２、ピグメントイエロー１３、ピグメントイエロー１７、ピグメントイエロー１）、ハンザイエロー等のイエロー顔料、ブリリアントカーミン６Ｂ、レーキレッドＣ、ウオッチングレッド等のマゼンタ顔料、フタロシアニンブルー、フタロシアニングリーン、アルカリブルー等のシアン顔料等を挙げることができる。 Examples of such organic pigments include yellow pigments such as disazo yellow (Pigment Yellow 12, Pigment Yellow 13, Pigment Yellow 17, and Pigment Yellow 1), Hansa Yellow, and magenta pigments such as Brilliant Carmine 6B, Lake Red C, and Watching Red. And cyan pigments such as phthalocyanine blue, phthalocyanine green, and alkali blue.
印刷インキ組成物用顔料分散体における有機顔料の含有量としては、有機顔料の固形分として、５〜３０質量％が好ましく例示され、１０〜２５質量％がより好ましく例示される。印刷インキ組成物用顔料分散体における有機顔料の含有量が上記の範囲であることにより、印刷インキ組成物用顔料分散体を用いて調製された印刷インキ組成物の濃度を適切な範囲にできる他、炭酸カルシウムや有機顔料の良好な分散性を得ることができるので好ましい。なお、上記「有機顔料の固形分として」との表現は、混練工程で用いた有機顔料のプレスケーキの質量に基づいて含有量を計算するのではなく、当該有機顔料のプレスケーキに含まれる有機顔料の固形分（すなわち有機顔料の純分）の質量に基づいて含有量を計算するとの意図で用いるものである。 As content of the organic pigment in the pigment dispersion for printing ink compositions, 5-30 mass% is illustrated preferably as a solid content of an organic pigment, and 10-25 mass% is illustrated more preferably. The content of the organic pigment in the pigment dispersion for printing ink composition is in the above range, so that the concentration of the printing ink composition prepared using the pigment dispersion for printing ink composition can be in an appropriate range. It is preferable because good dispersibility of calcium carbonate and organic pigment can be obtained. In addition, the expression “as the solid content of the organic pigment” does not calculate the content based on the mass of the press cake of the organic pigment used in the kneading process, but the organic pigment contained in the press cake of the organic pigment. It is used with the intention of calculating the content based on the mass of the solid content of the pigment (that is, the pure content of the organic pigment).
なお、上記の粉末状の炭酸カルシウムと有機顔料とを含めて、顔料成分とも呼ぶ。 The powdery calcium carbonate and the organic pigment are also referred to as pigment components.
印刷インキ組成物用ワニスは、樹脂成分と油成分とを含み、樹脂成分を油成分中に溶解又は分散させることにより調製される。 The varnish for a printing ink composition contains a resin component and an oil component, and is prepared by dissolving or dispersing the resin component in the oil component.
樹脂成分は、印刷用紙の表面で顔料成分を固定するバインダーとして機能する成分であり、また、顔料成分を印刷インキ組成物中に分散させるために用いられる成分でもある。このような樹脂としては、印刷インキ組成物の分野で通常使用されるものを特に制限なく挙げることができ、ロジン変性フェノール樹脂、ロジン変性マレイン酸樹脂、ロジン変性アルキド樹脂、ロジン変性石油樹脂、ロジンエステル樹脂、石油樹脂変性フェノール樹脂、アクリル変性フェノール樹脂、アルキド樹脂、植物油変性アルキド樹脂、石油樹脂等が例示される。これらの樹脂の重量平均分子量としては、１０００〜３０万程度を好ましく例示することができる。 The resin component is a component that functions as a binder that fixes the pigment component on the surface of the printing paper, and is also a component that is used to disperse the pigment component in the printing ink composition. Examples of such resins include those usually used in the field of printing ink compositions without any particular limitation, and include rosin modified phenolic resins, rosin modified maleic resins, rosin modified alkyd resins, rosin modified petroleum resins, rosin. Examples include ester resins, petroleum resin-modified phenol resins, acrylic-modified phenol resins, alkyd resins, vegetable oil-modified alkyd resins, and petroleum resins. The weight average molecular weight of these resins is preferably about 1000 to 300,000.
油成分は、上記樹脂成分を溶解させて印刷インキ組成物用ワニスとしたり、印刷インキ組成物の粘度を調節したりするために使用される。油成分としては、植物油及び／又は鉱物油を挙げることができ、これまで印刷インキ組成物の調製に用いられてきたものを使用できる。 The oil component is used for dissolving the resin component to form a varnish for a printing ink composition or adjusting the viscosity of the printing ink composition. Examples of the oil component include vegetable oils and / or mineral oils, and those that have been used in the preparation of printing ink compositions so far can be used.
本発明において、植物油には、植物油の他に植物油由来の脂肪酸エステル化合物が含まれる。植物油としては、大豆油、綿実油、アマニ油、サフラワー油、桐油、トール油、脱水ヒマシ油、カノーラ油等の乾性油や半乾性油等が例示される。また、植物油由来の脂肪酸エステル化合物としては、上記植物油に由来する脂肪酸のモノアルキルエステル化合物等が例示される。この脂肪酸モノアルキルエステル化合物を構成する脂肪酸としては、炭素数１６〜２０の飽和又は不飽和脂肪酸が好ましく例示され、このような飽和又は不飽和脂肪酸としては、ステアリン酸、イソステアリン酸、ヒドロキシステアリン酸、オレイン酸、リノール酸、リノレン酸、エレオステアリン酸等が好ましく例示される。脂肪酸モノアルキルエステル化合物を構成するアルキル基としては、炭素数１〜１０のアルキル基が好ましく例示され、より具体的には、メチル基、エチル基、プロピル基、イソプロピル基、ブチル基、イソブチル基、ｔｅｒｔ−ブチル基、２−エチルヘキシル基等が好ましく例示される。 In the present invention, the vegetable oil includes a vegetable oil-derived fatty acid ester compound in addition to the vegetable oil. Examples of vegetable oils include dry oils such as soybean oil, cottonseed oil, linseed oil, safflower oil, tung oil, tall oil, dehydrated castor oil, and canola oil, and semi-dry oils. Examples of the fatty acid ester compound derived from vegetable oil include monoalkyl ester compounds of fatty acids derived from the vegetable oil. As the fatty acid constituting the fatty acid monoalkyl ester compound, a saturated or unsaturated fatty acid having 16 to 20 carbon atoms is preferably exemplified, and as such a saturated or unsaturated fatty acid, stearic acid, isostearic acid, hydroxystearic acid, Preferred examples include oleic acid, linoleic acid, linolenic acid, eleostearic acid and the like. As the alkyl group constituting the fatty acid monoalkyl ester compound, an alkyl group having 1 to 10 carbon atoms is preferably exemplified, and more specifically, methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, Preferred examples include a tert-butyl group and 2-ethylhexyl group.
これらの植物油は、単独で又は二種以上を組み合わせて用いることができる。植物油としては、大豆油、大豆油脂肪酸エステル等が好ましく挙げられる。印刷インキ組成物における植物油の含有量としては、印刷インキ組成物全体に対して２０〜６０質量％程度を例示することができる。印刷インキ組成物用顔料分散体を用いて調製した印刷インキ組成物中の植物油の含有量が上記のような範囲となるように、印刷インキ組成物用ワニスに含まれる植物油の量を調節するのが好ましい。 These vegetable oils can be used alone or in combination of two or more. Preferred vegetable oils include soybean oil and soybean oil fatty acid ester. As content of the vegetable oil in a printing ink composition, about 20-60 mass% can be illustrated with respect to the whole printing ink composition. The amount of vegetable oil contained in the varnish for printing ink composition is adjusted so that the content of vegetable oil in the printing ink composition prepared using the pigment dispersion for printing ink composition falls within the above range. Is preferred.
本発明において、鉱物油には、溶剤成分と呼ばれる軽質の鉱物油や、潤滑油状である重質の鉱物油等が含まれる。 In the present invention, the mineral oil includes a light mineral oil called a solvent component, a heavy mineral oil that is a lubricating oil, and the like.
軽質の鉱物油としては、沸点１６０℃以上、好ましくは沸点２００℃以上の非芳香族系石油溶剤が例示される。このような非芳香族系石油溶剤としては、ＪＸ日鉱日石エネルギー株式会社製の０号ソルベント、同ＡＦソルベント５号、同ＡＦソルベント６号、同ＡＦソルベント７号等が例示される。 Examples of the light mineral oil include non-aromatic petroleum solvents having a boiling point of 160 ° C. or higher, preferably a boiling point of 200 ° C. or higher. Examples of such non-aromatic petroleum solvents include No. 0 Solvent, AF Solvent No. 5, AF Solvent No. 6 and AF Solvent No. 7 manufactured by JX Nippon Oil & Energy Corporation.
重質の鉱物油としては、スピンドル油、マシン油、ダイナモ油、シリンダー油等として分類されてきた各種の潤滑油を挙げることができる。これらの中でも、米国におけるＯＳＨＡ基準やＥＵ基準に適応させるとの観点からは、縮合多環芳香族成分の含有量が抑制されたものであることが好ましい。このような鉱物油としては、ＪＸ日鉱日石エネルギー株式会社製のインクオイルＨ８、同インクオイルＨ３５、三共油化工業株式会社製のＳＮＨ８、同ＳＮＨ４６、同ＳＮＨ２２０、同ＳＮＨ５４０等が例示される。 Examples of heavy mineral oils include various lubricating oils that have been classified as spindle oil, machine oil, dynamo oil, cylinder oil, and the like. Among these, from the viewpoint of adapting to the OSHA standard and EU standard in the United States, it is preferable that the content of the condensed polycyclic aromatic component is suppressed. Examples of such mineral oil include Ink Oil H8 and Ink Oil H35 manufactured by JX Nippon Oil & Energy Corporation, SNH8, SNH46, SNH220, and SNH540 manufactured by Sankyo Oil Chemical Co., Ltd.
これらの鉱物油は、単独で又は二種以上を組み合わせて用いることができる。印刷インキ組成物における鉱物油の含有量としては、印刷インキ組成物全体に対して０〜５０質量％程度を例示することができる。 These mineral oils can be used alone or in combination of two or more. As content of the mineral oil in a printing ink composition, about 0-50 mass% can be illustrated with respect to the whole printing ink composition.
上記の樹脂成分と油成分とを混合し、これらを加熱しながら撹拌することで、樹脂成分が溶解又は分散され印刷インキ組成物用ワニスが調製される。樹脂成分と油成分とを混合する際の割合としては、樹脂成分：油成分（質量比）が１５：８５から５０：５０程度の範囲を挙げることができる。 The resin component and the oil component are mixed and stirred while heating, whereby the resin component is dissolved or dispersed to prepare a varnish for a printing ink composition. As a ratio at the time of mixing a resin component and an oil component, the range whose resin component: oil component (mass ratio) is about 15:85 to 50:50 can be mentioned.
樹脂成分と油成分との混合物は、反応容器に仕込まれ、この反応容器中で撹拌されながら加熱される。この加熱によって樹脂成分が油成分中に溶解又は分散される。このときの加熱温度としては、１２０〜２５０℃の範囲を挙げることができる。好ましい加熱温度は、１２０〜２３０℃の範囲である。また、樹脂の溶解時間（すなわち、加熱を継続させる時間）は、２０〜６０分間程度を挙げることができる。 The mixture of the resin component and the oil component is charged into a reaction vessel and heated while being stirred in the reaction vessel. By this heating, the resin component is dissolved or dispersed in the oil component. As heating temperature at this time, the range of 120-250 degreeC can be mentioned. A preferable heating temperature is in the range of 120 to 230 ° C. In addition, the dissolution time of the resin (that is, the time for which heating is continued) can be about 20 to 60 minutes.
また、印刷インキ組成物用ワニスは、印刷インキ組成物用顔料分散体を用いて調製された印刷インキ組成物における粘弾性を調節するために、必要に応じて、上記のようにして樹脂成分が溶解又は分散状態とされた後でこれらに金属キレート化合物を添加し、さらに加熱及び撹拌を継続することでゲル化ワニスとされてもよい。 Moreover, the varnish for printing ink composition has a resin component as described above, if necessary, in order to adjust the viscoelasticity in the printing ink composition prepared using the pigment dispersion for printing ink composition. A metal chelate compound may be added to these after being dissolved or dispersed, and further heated and stirred to form a gelled varnish.
このような目的で用いられる金属キレート化合物としては、アルミニウムエチルアセテートジイソプロピレート、アルミニウムイソプロピレート、ステアリン酸アルミニウム、エチルアセトアセテートアルミニウムジイソプロピレート、アルミニウムジイソプロピレート、エチルアセトアセテートアルミニウムジイソプロポキシド等、及びそれらの混合物等が挙げられ、より好ましくはエチルアセトアセテートアルミニウムジイソプロピレート（ＡＬＣＨ）が挙げられる。金属キレート化合物の添加量としては、上記の反応容器に仕込んだ樹脂成分と油成分との合計を１００質量部としたとき、０．５〜３．０質量部程度が例示される。 Examples of metal chelate compounds used for such purposes include aluminum ethyl acetate diisopropylate, aluminum isopropylate, aluminum stearate, ethyl acetoacetate aluminum diisopropylate, aluminum diisopropylate, ethyl acetoacetate aluminum diisopropoxide, etc. , And mixtures thereof, more preferably ethyl acetoacetate aluminum diisopropylate (ALCH). The amount of the metal chelate compound added is, for example, about 0.5 to 3.0 parts by mass when the total of the resin component and the oil component charged in the reaction vessel is 100 parts by mass.
金属キレート化合物を上記反応容器に投入した後、撹拌しながらこれらを加熱する。加熱温度としては１２０〜２００℃程度を挙げることができ、この温度にて１５〜６０分程度反応させる。これにより、印刷インキ組成物用ワニス中に存在している樹脂成分が架橋され、ゲル化ワニスとなる。 After putting the metal chelate compounds into the reaction vessel, they are heated with stirring. As heating temperature, about 120-200 degreeC can be mentioned, It is made to react at this temperature for about 15-60 minutes. Thereby, the resin component which exists in the varnish for printing ink compositions is bridge | crosslinked, and it becomes a gelatinization varnish.
印刷インキ組成物用顔料分散体における樹脂成分の含有量としては、１０〜５０質量％が好ましく例示され、１４〜４０質量％がより好ましく例示されるので、樹脂成分がこのような含有量となるように印刷インキ組成物用ワニスの添加量を決定することが好ましい。印刷インキ組成物用顔料分散体における樹脂成分の含有量が上記の範囲であることにより、印刷インキ組成物用顔料分散体における顔料成分の分散性が良好になるとともに、印刷インキ組成物用顔料分散体のハンドリングが良好となる。なお、混練工程では、混練される混合物の粘度が低すぎる（すなわち、混合物が柔らかすぎる）と混合物に十分なせん断力が加わらずに、分散不良の原因になる。そのため、混練工程では、上記の基準で決定された量の印刷インキ組成物用ワニスの全量を一度に添加するのではなく、混合物が固練り状態となるように、上記の基準で決定された量の印刷インキ組成物用ワニスを二回以上に分割して添加することが好ましい。 As content of the resin component in the pigment dispersion for printing ink compositions, 10-50 mass% is illustrated preferably, and 14-40 mass% is illustrated more preferably, Therefore A resin component becomes such content. Thus, it is preferable to determine the addition amount of the varnish for printing ink compositions. When the content of the resin component in the pigment dispersion for printing ink composition is in the above range, the dispersibility of the pigment component in the pigment dispersion for printing ink composition is improved, and the pigment dispersion for printing ink composition is Good body handling. In the kneading step, if the viscosity of the mixture to be kneaded is too low (that is, the mixture is too soft), sufficient shearing force is not applied to the mixture, which causes poor dispersion. For this reason, in the kneading step, the amount determined according to the above standard is not added to the whole amount of the varnish for the printing ink composition determined according to the above standard at a time, but the mixture is in a kneaded state. The printing ink composition varnish is preferably added in two or more portions.
上記で説明した、脂肪酸により表面処理された粉末状の炭酸カルシウム、水を含んだ有機顔料のプレスケーキ、及び印刷インキ組成物用ワニスの三成分を混合し、混練を行う。ここで用いる混練装置としては、フラッシャー（ニーダー）を例示することができる。なお、この工程で用いる混練装置には、後述の水除去工程における便宜のために、装置を傾斜させることにより、混練物から遊離されて装置内に溜まった水を排水する機構や、装置内を減圧しながら加熱することにより内容物に含まれる水分を除去することのできる機構を備えることが好ましい。 The above-described three components, that is, powdered calcium carbonate surface-treated with a fatty acid, a press cake of an organic pigment containing water, and a varnish for a printing ink composition are mixed and kneaded. A flasher (kneader) can be exemplified as the kneading apparatus used here. Note that the kneading apparatus used in this step includes a mechanism for draining water that has been released from the kneaded material and accumulated in the apparatus by tilting the apparatus for convenience in the water removal process described later, and the inside of the apparatus. It is preferable to provide a mechanism capable of removing moisture contained in the contents by heating while reducing the pressure.
この一工程を経ることにより、有機顔料及び粉末の炭酸カルシウムの両方が印刷インキ組成物用ワニス中に分散される。通常、粉末の炭酸カルシウムを印刷インキ組成物用ワニス中に分散させるには、まず炭酸カルシウムと印刷インキ組成物用ワニスとの混合物を調製し、次いで三本ロールミル等の分散機によりこの混合物に強力なせん断力を与えて炭酸カルシウムの粒子を粉砕させる必要があり、多くのエネルギーと時間とを必要とする。しかしながら、本発明の製造方法によれば、ニーダーで与えられる程度のせん断力で短時間に粉末の炭酸カルシウムが印刷インキ組成物用ワニス中に分散する。このため、本発明の製造方法によれば、これまでの印刷インキ組成物用顔料分散体の製造方法を用いた場合に比べて、格段に生産性が向上する。 Through this one step, both the organic pigment and the powdered calcium carbonate are dispersed in the varnish for the printing ink composition. Usually, in order to disperse powdered calcium carbonate in a varnish for a printing ink composition, first, a mixture of calcium carbonate and a varnish for a printing ink composition is prepared, and then the mixture is strongly resisted by a dispersing machine such as a three-roll mill. Therefore, it is necessary to pulverize the calcium carbonate particles by applying a proper shearing force, which requires a lot of energy and time. However, according to the production method of the present invention, powdered calcium carbonate is dispersed in a varnish for a printing ink composition in a short time with a shearing force given by a kneader. For this reason, according to the manufacturing method of this invention, productivity improves markedly compared with the case where the manufacturing method of the pigment dispersion for printing ink compositions until now is used.
本発明の製造方法を用いた場合に、このように炭酸カルシウムを効率良く分散することのできる理由は必ずしも明らかでない。しかしながら、その理由となる可能性の一つとして、上記三成分の混練を進めるうちに、プレスケーキ状態の有機顔料粒子の周囲が水相から油相に転換されて混合物中に遊離状態の水分を生じ、この水分が粉末である炭酸カルシウムに浸透して、凝集状態である炭酸カルシウム粒子同士の結合を緩めることを挙げることができる。こうして炭酸カルシウム粒子同士の結合が緩んだ結果、比較的小さなせん断力により分散が可能になったものと考えられる。 When the production method of the present invention is used, the reason why calcium carbonate can be efficiently dispersed in this way is not necessarily clear. However, as one of the reasons for this, as the above three components are being kneaded, the surroundings of the organic pigment particles in the presscake state are converted from an aqueous phase to an oil phase, and free moisture is contained in the mixture. It can be mentioned that the moisture is infiltrated into the calcium carbonate powder and loosens the bonds between the aggregated calcium carbonate particles. As a result of loosening of the bonds between the calcium carbonate particles in this way, it is considered that the dispersion was made possible by a relatively small shearing force.
［水除去工程］
上記混練工程を経た混合物は、水除去工程に付される。水除去工程は、上記混練工程の進行に伴って、混練を受けている混合物から遊離してきた水分を除去する工程である。すなわち、上記混練工程の進行とともに、プレスケーキに含まれる有機顔料分子の周りの水相が油相に転換され、余剰となった水分が混合物の系外に排出されて混練装置内に溜まったり、混合物中に水滴の状態や乳化した状態で残留したりするので、この水分を除去する。
[Water removal process]
The mixture that has undergone the kneading step is subjected to a water removal step. The water removal step is a step of removing water released from the mixture being kneaded as the kneading step proceeds. That is, with the progress of the kneading step, the water phase around the organic pigment molecules contained in the press cake is converted into an oil phase, and excess water is discharged out of the mixture system and accumulated in the kneading apparatus, The water remains in the mixture in the form of water droplets or in an emulsified state, so this water is removed.
混練装置内に溜まった水分は、例えば、混練装置を傾斜させて排水を行うことで取り除かれる。また、混合物中に水滴の状態や乳化した状態で残留する水分は、上記混練工程を経た混合物を減圧可能な容器に収容し、減圧及び加熱を行いながら容器内の混合物をニーダー等により混合することで取り除かれる。これらの操作により、上記混練工程を経た混合物は、それに含まれる水分が除去され、印刷インキ組成物用顔料分散体となる。なお、上記混練工程を経た混合物は、水除去工程において、含水率が２質量％以下となるまで水を除去されることが好ましい。ここで、混合物中の含水率は、カールフィッシャー水分計等によって測定することができる。 Moisture accumulated in the kneading apparatus is removed, for example, by inclining the kneading apparatus and performing drainage. In addition, moisture remaining in the mixture in the form of water droplets or emulsified is to contain the mixture after the kneading step in a container that can be decompressed, and mix the mixture in the container with a kneader or the like while performing decompression and heating. To be removed. By these operations, the mixture that has undergone the kneading step is freed of moisture contained therein, and becomes a pigment dispersion for a printing ink composition. In addition, it is preferable that the mixture which passed through the said kneading | mixing process removes water until a moisture content will be 2 mass% or less in a water removal process. Here, the moisture content in the mixture can be measured by a Karl Fischer moisture meter or the like.
水除去工程を経た印刷インキ組成物用顔料分散体は、必要に応じて、さらに三本ロールミル等の分散装置により練肉されてもよい。 The pigment dispersion for a printing ink composition that has undergone the water removal step may be further kneaded by a dispersing device such as a three-roll mill, if necessary.
本発明の印刷インキ組成物用顔料分散体の製造方法によれば、特に脂肪酸で表面処理された粉末状の炭酸カルシウムを用いて上記の手順で印刷インキ組成物用顔料分散体を製造することにより、意外なことに、得られた印刷インキ組成物用顔料分散体から調製された印刷インキ組成物における「ねっぱり」現象の発生が大きく抑制される。なお、「ねっぱり」現象とは、上述のように、印刷部数の増大に伴って印刷機のローラー上に粘つきの強い状態に変質した印刷インキ組成物が溜まる現象である。この現象による弊害の一例として、印刷機の停止→再始動時における版面のクリーンアップに時間が掛かり、損紙の増大を招くことを挙げることができる。 According to the method for producing a pigment dispersion for a printing ink composition of the present invention, the pigment dispersion for a printing ink composition is produced by the above-described procedure using powdered calcium carbonate particularly treated with a fatty acid. Surprisingly, the occurrence of the “stickiness” phenomenon in the printing ink composition prepared from the obtained pigment dispersion for printing ink composition is greatly suppressed. In addition, as described above, the “slippery” phenomenon is a phenomenon in which a printing ink composition that has deteriorated into a sticky state accumulates on a roller of a printing press as the number of printed copies increases. As an example of the harmful effects of this phenomenon, it can be said that it takes time to clean up the printing plate when the printing machine is stopped and restarted, resulting in an increase in the amount of waste paper.
また、本発明の製造方法により得られた印刷インキ組成物用顔料分散体を用いて調製された印刷インキ組成物で印刷を行うと、従来の三本ロールミルを用いた製造方法により得られた印刷インキ組成物用顔料分散体を用いて調製された印刷インキ組成物で印刷を行ったときよりも、印刷時におけるミスチングの発生が著しく低減される。このような効果が得られる理由は、必ずしも明らかでないが、一般に三本ロールミルを用いて炭酸カルシウム粒子の分散を行う場合には、顔料と分散媒（印刷インキ組成物用ワニス）との混合物が三本のロール間を効率良く転移できるようにこの混合物に含まれる樹脂成分の量を多くする必要があるとされ、こうした措置により多めに添加された樹脂成分が印刷の際のローラー間での糸引きを引き起こすと考えられるのに対して、本発明の製造方法により炭酸カルシウム粒子の分散を行う場合には、三本ロールミルを用いて分散を行うときのように樹脂成分を多めに添加する必要がなく、印刷の際のローラー間での糸引きが少なくなるためと推察される。 In addition, when printing is performed with a printing ink composition prepared using the pigment dispersion for a printing ink composition obtained by the production method of the present invention, printing obtained by a production method using a conventional three-roll mill is performed. The occurrence of misting during printing is significantly reduced as compared with the case where printing is performed with a printing ink composition prepared using a pigment dispersion for an ink composition. The reason why such an effect can be obtained is not necessarily clear, but generally, when calcium carbonate particles are dispersed using a three-roll mill, a mixture of a pigment and a dispersion medium (varnish for printing ink composition) is used. It is necessary to increase the amount of the resin component contained in this mixture so that it can be efficiently transferred between the rolls of the book, and the resin component added in a large amount due to such measures causes stringing between the rollers during printing. In contrast, when the calcium carbonate particles are dispersed by the production method of the present invention, it is not necessary to add a large amount of resin component as in the case of dispersing using a three-roll mill. This is presumably because stringing between rollers during printing is reduced.
以上のように、本発明は、脂肪酸により表面処理された粉末状の炭酸カルシウム、水を含んだ有機顔料のプレスケーキ、及び印刷インキ組成物用ワニスを含む混合物を混練して印刷インキ組成物用顔料分散体を調製することにより、印刷インキ組成物用顔料分散体の生産性が向上するだけでなく、これを用いて調製された印刷インキ組成物が上記のような優れた特性を備えるようになることを本発明者らが知見したことにより完成されたものである。 As described above, the present invention is for a printing ink composition by kneading a mixture containing powdered calcium carbonate surface-treated with a fatty acid, an organic pigment press cake containing water, and a varnish for a printing ink composition. By preparing the pigment dispersion, not only the productivity of the pigment dispersion for the printing ink composition is improved, but also the printing ink composition prepared using the pigment dispersion has the excellent characteristics as described above. This has been completed by the present inventors' knowledge.
＜印刷インキ組成物用顔料分散体＞
上記の製造方法により得られた印刷インキ組成物用顔料分散体も本発明の一つである。既に述べたように、本発明の印刷インキ組成物顔料分散体は、これを用いて調製された印刷インキ組成物で印刷を行った際に、「ねっぱり」現象やミスチングの発生を抑制できる点で従来のものよりも優れるものである。
<Pigment dispersion for printing ink composition>
A pigment dispersion for a printing ink composition obtained by the above production method is also one aspect of the present invention. As already described, the printing ink composition pigment dispersion of the present invention can suppress the occurrence of “slipping” phenomenon and misting when printing is performed with a printing ink composition prepared using the same. It is better than the conventional one.
ここで、本発明の印刷インキ組成物用顔料分散体を用いたときの印刷インキ組成物の調製方法と、従来の方法で製造された印刷インキ組成物用顔料分散体を用いたときの印刷インキ組成物の調製方法とを、図１及び２を参照しながら対比説明する。図１は、本発明の印刷インキ組成物用顔料分散体を用いたときの印刷インキ組成物の製造手順を示すフロー図であり、図２は、従来の方法で製造された印刷インキ組成物用顔料分散体を用いたときの印刷インキ組成物の製造手順を示すフロー図である。 Here, the preparation method of the printing ink composition when using the pigment dispersion for a printing ink composition of the present invention, and the printing ink when using the pigment dispersion for a printing ink composition produced by a conventional method The method for preparing the composition will be described with reference to FIGS. FIG. 1 is a flow diagram showing a production procedure of a printing ink composition when using the pigment dispersion for a printing ink composition of the present invention, and FIG. 2 is for a printing ink composition produced by a conventional method. It is a flowchart which shows the manufacture procedure of a printing ink composition when using a pigment dispersion.
既に述べたように、本発明の印刷インキ組成物用顔料分散体は、着色顔料である有機顔料と体質顔料である炭酸カルシウム粉末とを一度に分散媒（印刷インキ組成物用ワニス）に分散させてなり、着色顔料と体質顔料との両方を含んだ複合型の顔料分散体である。したがって、図１に示すように、この顔料分散体を用いて印刷インキ組成物を調製するに際しては、フラッシング（混練工程）により得た顔料分散体を必要に応じて三本ロールミルにより練肉した後で、この顔料分散体に印刷インキ用ワニス、油成分、各種添加剤等を加えて混合及び調整を行う工程を経ることになる。 As described above, the pigment dispersion for a printing ink composition of the present invention is obtained by dispersing an organic pigment as a color pigment and a calcium carbonate powder as an extender pigment in a dispersion medium (varnish for printing ink composition) at a time. It is a composite type pigment dispersion containing both colored pigments and extender pigments. Accordingly, as shown in FIG. 1, when preparing a printing ink composition using this pigment dispersion, the pigment dispersion obtained by flushing (kneading step) is kneaded by a three-roll mill as necessary. Thus, a varnish for printing ink, an oil component, various additives and the like are added to the pigment dispersion and mixed and adjusted.
これに対して、従来の方法で製造された印刷インキ組成物用顔料分散体では、着色顔料（有機顔料）を含んだ着色顔料分散体と、体質顔料を含んだ体質顔料分散体とが別体になっている。これらの顔料分散体は、それぞれ別々に、着色又は体質顔料と分散媒とを混合し、次いでフラッシング、又は三本ロールミルを用いた練肉といった手法により調製されたものである。そして、図２に示すように、これらの顔料分散体を用いて印刷インキ組成物を調製するに際しては、必要に応じて顔料分散体を三本ロールミルにより練肉した後で、これらの顔料分散体を混合し、さらに印刷インキ用ワニス、油成分、各種添加剤等を加えて混合及び調整を行う工程を経ることになる。 In contrast, in a pigment dispersion for a printing ink composition manufactured by a conventional method, a colored pigment dispersion containing a color pigment (organic pigment) and an extender pigment dispersion containing an extender are separated. It has become. Each of these pigment dispersions is prepared by a technique such as separately mixing a colored or extender pigment and a dispersion medium, and then flushing or kneading using a three-roll mill. As shown in FIG. 2, when preparing a printing ink composition using these pigment dispersions, these pigment dispersions are kneaded with a three-roll mill if necessary. Are further mixed and adjusted by adding a varnish for printing ink, an oil component, various additives, and the like.
＜印刷インキ組成物＞
上記の印刷インキ組成物用顔料分散体を含んでなる印刷インキ組成物も本発明の一つである。既に述べたように、本発明の印刷インキ組成物は、印刷時における「ねっぱり」現象やミスチングの発生を抑制できる点で従来のものよりも優れる。本発明の印刷インキ組成物は、上記印刷インキ組成物用顔料分散体に、既に述べた印刷インキ組成物用ワニス及び油成分を添加し、さらに必要に応じて他の印刷インキ組成物用顔料分散体や添加剤（酸化防止剤、アルコール類、ワックス類等）等を加え、所望の粘度に調整することで得られる。印刷インキ組成物における粘度としては、ラレー粘度計による２５℃での値が２．０〜２０Ｐａ・ｓであることを例示できるが、特に限定されない。
<Printing ink composition>
A printing ink composition comprising the above-described pigment dispersion for printing ink composition is also one aspect of the present invention. As already described, the printing ink composition of the present invention is superior to the conventional one in that it can suppress the occurrence of “slipping” phenomenon and misting during printing. In the printing ink composition of the present invention, the above-described varnish for printing ink composition and oil component are added to the above-described pigment dispersion for printing ink composition, and further, pigment dispersion for other printing ink composition is added as necessary. It can be obtained by adding a body and additives (antioxidants, alcohols, waxes, etc.) and adjusting to a desired viscosity. As a viscosity in a printing ink composition, although the value in 25 degreeC by a Raleigh viscometer can illustrate 2.0-20 Pa.s, it is not specifically limited.
印刷インキ組成物における上記印刷インキ組成物用顔料分散体の含有量は、印刷インキ組成物において必要とされる有機顔料濃度を考慮して適宜決定すればよい。印刷インキ組成物における有機顔料濃度としては、印刷インキ組成物全体に対して８〜３０％程度が例示されるが特に限定されない。なお、イエロー顔料を使用してイエロー印刷インキ組成物を、マゼンタ顔料を使用してマゼンタ印刷インキ組成物を、シアン顔料を使用してシアン印刷インキ組成物をそれぞれ調製する場合には、補色として、他の色の印刷インキ組成物用顔料分散体を併用したり、他の色の印刷インキ組成物を添加したりすることも可能である。 What is necessary is just to determine suitably content of the said pigment dispersion for printing ink compositions in a printing ink composition in consideration of the organic pigment density | concentration required in a printing ink composition. The organic pigment concentration in the printing ink composition is exemplified by about 8 to 30% with respect to the entire printing ink composition, but is not particularly limited. In addition, when preparing a yellow printing ink composition using a yellow pigment, a magenta printing ink composition using a magenta pigment, and a cyan printing ink composition using a cyan pigment, respectively, as a complementary color, It is also possible to use a pigment dispersion for printing ink compositions of other colors in combination, or to add printing ink compositions of other colors.
以下に実施例を挙げて本発明をさらに詳細に説明するが、本発明はこれらの実施例に何ら限定されるものではない。なお、以下の記載では、特に断りのない限り、「％」は「質量％」を意味し、「部」は質量部を意味する。 The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. In the following description, “%” means “mass%” and “part” means mass parts unless otherwise specified.
［印刷インキ組成物用ワニスＡの調製］
コンデンサー、温度計及び撹拌機を装着した４つ口フラスコに、重量平均分子量１０万のロジン変性フェノール樹脂（荒川化学工業株式会社製、ＫＧ−２２１２）を３５部、大豆油を２０部及びＡＦソルベント６号（ＪＸ日鉱日石エネルギー株式会社製）を４４．５部仕込んだ後２００℃に昇温し、同温度を１時間維持することにより樹脂を溶解させて、印刷インキ組成物用ワニスＡを得た。
[Preparation of varnish A for printing ink composition]
In a four-necked flask equipped with a condenser, thermometer and stirrer, 35 parts of rosin modified phenolic resin (Arakawa Chemical Industries, KG-2212) with a weight average molecular weight of 100,000, 20 parts of soybean oil and AF solvent After charging 44.5 parts of No. 6 (manufactured by JX Nippon Oil & Energy Co., Ltd.), the temperature was raised to 200 ° C., and the resin was dissolved by maintaining the same temperature for 1 hour to obtain varnish A for printing ink composition Obtained.
［印刷インキ組成物用ワニスＢの調製］
コンデンサー、温度計及び撹拌機を装着した４つ口フラスコに、上記ロジン変性フェノール樹脂を３５部、大豆油を２０部及びＡＦソルベント６号を４４．５部仕込んだ後２００℃に昇温し、同温度を１時間維持することにより樹脂を溶解させた後、エチルアセトアセテートアルミニウムジイソプロピレート（川研ファインケミカル株式会社製、ＡＬＣＨ）を０．５部仕込み、その後１７０℃で６０分間加熱保持して、印刷インキ組成物用ワニスＢを得た。
[Preparation of Varnish B for Printing Ink Composition]
Into a four-necked flask equipped with a condenser, a thermometer and a stirrer, 35 parts of the rosin-modified phenolic resin, 20 parts of soybean oil and 44.5 parts of AF solvent 6 were charged, and then the temperature was raised to 200 ° C. After dissolving the resin by maintaining the same temperature for 1 hour, 0.5 part of ethyl acetoacetate aluminum diisopropylate (ALCH, manufactured by Kawaken Fine Chemical Co., Ltd.) was charged, and then heated and maintained at 170 ° C. for 60 minutes. A varnish B for printing ink composition was obtained.
［実施例１］
卓上フラッシャー（井上機械株式会社製）内に、２５℃にて、印刷インキ組成物用ワニスＡを３０質量部、炭酸カルシウムＶｉｇｏｔ１０（商品名、白石カルシウム株式会社製、脂肪酸により表面処理された炭酸カルシウム粉末）を１５質量部、及びカーミン６Ｂ顔料（住化カラー株式会社製、カーミン６Ｂ顔料のプレスケーキ、固形分量約３０質量％）を固形分として２０質量部投入し、５０℃にて６０分間フラッシングを行った。その後、卓上フラッシャーの容器を傾斜させることで遊離してきた水を除去するとともに、減圧加熱することで混練物中の水分量を２質量％以下とした。こうして得た混練物に印刷インキ組成物用ワニスＡを１０質量部及び印刷インキ組成物用ワニスＢを１４．５質量部加え、卓上フラッシャーのニーダーを用いて混合することで実施例１の印刷インキ組成物用顔料分散体を得た。グラインドメーターを用いて実施例１の印刷インキ組成物用顔料分散体に含まれる顔料の粒子径測定を行った結果、顔料の粒子径は７．５μｍ以下だった。
[Example 1]
In a tabletop flasher (Inoue Machine Co., Ltd.), at 25 ° C., 30 parts by weight of varnish A for printing ink composition, calcium carbonate Vigot 10 (trade name, manufactured by Shiraishi Calcium Co., Ltd., surface treated with fatty acid 15 parts by weight of powder) and 20 parts by weight of Carmine 6B pigment (manufactured by Sumika Color Co., Ltd., press cake of Carmine 6B pigment, solid content of about 30% by weight) as solids, and flushing at 50 ° C. for 60 minutes Went. Then, while removing the water which was liberated by inclining the container of a tabletop flasher, the moisture content in a kneaded material was made into 2 mass% or less by heating under reduced pressure. The printing ink of Example 1 was added to the kneaded material thus obtained by adding 10 parts by weight of varnish A for printing ink composition and 14.5 parts by weight of varnish B for printing ink composition, and mixing the mixture using a table flasher kneader. A pigment dispersion for the composition was obtained. As a result of measuring the particle diameter of the pigment contained in the pigment dispersion for printing ink composition of Example 1 using a grindometer, the particle diameter of the pigment was 7.5 μm or less.
［比較例１］
卓上フラッシャー（井上機械株式会社製）内に、２５℃にて、印刷インキ組成物用ワニスＡを３０質量部、炭酸カルシウム白艶華Ｔ−ＤＤ（商品名、白石カルシウム株式会社製、ロジン酸により表面処理された炭酸カルシウム粉末）を１５質量部、及び実施例１で用いたのと同じカーミン６Ｂ顔料を固形分として２０質量部投入し、５０℃にて６０分間フラッシングを行った。その後、卓上フラッシャーの容器を傾斜させることで遊離してきた水を除去するとともに、減圧加熱することで混練物中の水分量を２質量％以下とした。こうして得た混練物に印刷インキ組成物用ワニスＡを１０質量部及び印刷インキ組成物用ワニスＢを１４．５質量部加え、卓上フラッシャーのニーダーを用いて混合することで比較例１の印刷インキ組成物用顔料分散体を得た。グラインドメーターを用いて比較例１の印刷インキ組成物用顔料分散体に含まれる顔料の粒子径測定を行った結果、顔料の粒子径は７．５μｍ以下だった。
[Comparative Example 1]
In a tabletop flasher (Inoue Machine Co., Ltd.), at 25 ° C., 30 parts by weight of varnish A for printing ink composition, calcium carbonate white gloss T-DD (trade name, manufactured by Shiroishi Calcium Co., Ltd., surface treated with rosin acid 15 parts by weight of the calcium carbonate powder and 20 parts by weight of the same carmine 6B pigment used in Example 1 were added as solids, and flushed at 50 ° C. for 60 minutes. Then, while removing the water which was liberated by inclining the container of a tabletop flasher, the moisture content in a kneaded material was made into 2 mass% or less by heating under reduced pressure. The printing ink of Comparative Example 1 was added to the kneaded material thus obtained by adding 10 parts by weight of varnish A for printing ink composition and 14.5 parts by weight of varnish B for printing ink composition, and mixing them using a table flasher kneader. A pigment dispersion for the composition was obtained. As a result of measuring the particle diameter of the pigment contained in the pigment dispersion for printing ink composition of Comparative Example 1 using a grindometer, the particle diameter of the pigment was 7.5 μm or less.
［比較例２］
卓上フラッシャー（井上機械株式会社製）内に、２５℃にて、炭酸カルシウム白艶華Ｔ−ＤＤ（商品名、白石カルシウム株式会社製、ロジン酸により表面処理された炭酸カルシウム粉末）を１００質量部投入した。次にそこにイオン交換水を５０質量部投入して撹拌混合して、スラリー状態にした。ここに印刷インキ組成物用ワニスＡを２５質量部添加し、５０℃にて６０分間フラッシングを行った。その後、遊離してきた水を除去するとともに、減圧加熱することで混練物中の水分量を２質量％以下とした。こうして得た混練物に印刷インキ組成物用ワニスＡを１７質量部及び印刷インキ組成物用ワニスＢを２５質量部加え、卓上フラッシャーのニーダーを用いて混合することで分散体１を調製した。グラインドメーターを用いて分散体１に含まれる炭酸カルシウムの粒子径測定を行った結果、炭酸カルシウムの粒子径は７．５μｍ以下だった。一方、卓上フラッシャー（井上機械株式会社製）内に、２５℃にて、印刷インキ組成物用ワニスＡを３０質量部、及び実施例１で用いたのと同じカーミン６Ｂ顔料を固形分として３０質量部投入し、５０℃にて６０分間フラッシングを行った。その後、卓上フラッシャーの容器を傾斜させることで遊離してきた水を除去するとともに、減圧加熱することで混練物中の水分量を２質量％以下とした。こうして得た混練物に印刷インキ組成物用ワニスＡを７質量部及び印刷インキ組成物用ワニスＢを１３質量部加え、卓上フラッシャーのニーダーを用いて混合することで分散体２を得た。グラインドメーターを用いて分散体２に含まれる顔料の粒子径測定を行った結果、顔料の粒子径は７．５μｍ以下だった。その後、分散体１を２８質量部と分散体２を６０質量部と印刷インキ用ワニスＡを１３質量部とを均一に混ぜ合わせて、比較例２の印刷インキ組成物用顔料分散体を得た。なお、比較例２の印刷インキ組成物用顔料分散体における炭酸カルシウム及びカーミン６Ｂの含有量は、実施例１及び比較例１におけるそれとほぼ同じである。
[Comparative Example 2]
In a tabletop flasher (Inoue Machine Co., Ltd.), 100 parts by mass of calcium carbonate white glaze T-DD (trade name, calcium carbonate powder surface-treated with rosin acid manufactured by Shiroishi Calcium Co., Ltd.) was added at 25 ° C. . Next, 50 parts by mass of ion-exchanged water was added thereto and mixed with stirring to form a slurry. 25 mass parts of varnish A for printing ink compositions was added here, and flushing was performed for 60 minutes at 50 degreeC. Then, while removing the released water, the water content in the kneaded product was reduced to 2% by mass or less by heating under reduced pressure. Dispersion 1 was prepared by adding 17 parts by mass of varnish A for printing ink composition and 25 parts by mass of varnish B for printing ink composition to the kneaded material thus obtained, and mixing the mixture using a kneader of a desktop flasher. As a result of measuring the particle size of calcium carbonate contained in Dispersion 1 using a grindometer, the particle size of calcium carbonate was 7.5 μm or less. On the other hand, in a tabletop flasher (manufactured by Inoue Machine Co., Ltd.), at 25 ° C., 30 parts by mass of the varnish A for printing ink composition and 30% by mass of the same Carmine 6B pigment as used in Example 1 were used. And flushing was performed at 50 ° C. for 60 minutes. Then, while removing the water which was liberated by inclining the container of a tabletop flasher, the moisture content in a kneaded material was made into 2 mass% or less by heating under reduced pressure. Dispersion 2 was obtained by adding 7 parts by mass of varnish A for printing ink composition and 13 parts by mass of varnish B for printing ink composition to the kneaded product thus obtained, and mixing the mixture using a table flasher kneader. As a result of measuring the particle diameter of the pigment contained in Dispersion 2 using a grindometer, the particle diameter of the pigment was 7.5 μm or less. Then, 28 parts by mass of dispersion 1, 60 parts by mass of dispersion 2, and 13 parts by mass of varnish A for printing ink were mixed uniformly to obtain a pigment dispersion for printing ink composition of Comparative Example 2. . The contents of calcium carbonate and carmine 6B in the pigment dispersion for printing ink composition of Comparative Example 2 are substantially the same as those in Example 1 and Comparative Example 1.
［比較例３］
印刷インキ組成物用ワニスＡを４４質量部及び印刷インキ組成物用ワニスＢを１６質量部と、炭酸カルシウムＶｉｇｏｔ１０（商品名、白石カルシウム株式会社製、脂肪酸により表面処理された炭酸カルシウム粉末）を４０質量部とをよく混ぜ合わせ、三本ロールミルを用いて練肉し、分散体３を調製した。グラインドメーターを用いて分散体３に含まれる炭酸カルシウムの粒子径測定を行った結果、炭酸カルシウムの粒子径は７．５μｍ以下だった。その後、分散体３を４２質量部と比較例２における分散体２を５８質量部とを均一に混ぜ合わせて、比較例３の印刷インキ組成物用顔料分散体を得た。なお、比較例３の印刷インキ組成物用顔料分散体における炭酸カルシウム及びカーミン６Ｂの含有量は、実施例１及び比較例１におけるそれとほぼ同じである。
[Comparative Example 3]
44 parts by mass of varnish A for printing ink composition and 16 parts by mass of varnish B for printing ink composition, and 40 calcium carbonate Vigot 10 (trade name, calcium carbonate powder surface-treated with fatty acid, manufactured by Shiraishi Calcium Co., Ltd.) A mass part was mixed well and kneaded using a three-roll mill to prepare Dispersion 3. As a result of measuring the particle size of calcium carbonate contained in Dispersion 3 using a grindometer, the particle size of calcium carbonate was 7.5 μm or less. Thereafter, 42 parts by mass of dispersion 3 and 58 parts by mass of dispersion 2 in comparative example 2 were mixed uniformly to obtain a pigment dispersion for printing ink composition of comparative example 3. The contents of calcium carbonate and carmine 6B in the pigment dispersion for printing ink composition of Comparative Example 3 are almost the same as those in Example 1 and Comparative Example 1.
実施例１、及び比較例１〜３のそれぞれの印刷インキ組成物用顔料分散体を用いて、印刷インキ組成物用顔料分散体を５４質量部、印刷インキ組成物用ワニスＡを２０質量部、印刷インキ組成物用ワニスＢを２０質量部及び大豆油を６質量部混合し、さらに、ラレー粘度計における粘度が６Ｐａ・ｓ、スロープ（ＪＩＳ Ｋ５１０１に従い２５℃で測定）が５±１になるように印刷インキ組成物用ワニスＡ、印刷インキ組成物用ワニスＢ及び大豆油を用いて調節し、それぞれ実施例１、及び比較例１〜３の印刷インキ組成物とした。 Using the pigment dispersion for printing ink compositions of Example 1 and Comparative Examples 1 to 3, 54 parts by mass of pigment dispersion for printing ink composition, 20 parts by mass of varnish A for printing ink composition, 20 parts by weight of varnish B for printing ink composition and 6 parts by weight of soybean oil are mixed, and the viscosity in the Raleigh viscometer is 6 Pa · s and the slope (measured at 25 ° C. according to JIS K5101) is 5 ± 1. The varnish A for printing ink composition, the varnish B for printing ink composition, and soybean oil were used to make the printing ink compositions of Example 1 and Comparative Examples 1 to 3, respectively.
［印刷評価］
実施例１、及び比較例１〜３の印刷インキ組成物のそれぞれについて、Ｎ−７５０型印刷実験機（東浜精機株式会社製）を使用して、印刷速度１２万部／時で用紙を新聞用更紙として下記のベタ紙面濃度にて印刷試験を行った。各印刷インキ組成物について２万部の印刷を行い、それぞれの印刷の終了後における水着けローラー（印刷版に湿し水を供給するローラー）上の印刷インキ組成物の「ねっぱり」状態を指触で評価した。その評価結果を表１の印刷評価結果欄に示す。印刷試験における湿し水としては水道水にＳＡＨ−７（サカタインクス株式会社製、アルカリＨ液）を０．７％加えたものを使用し、湿し水の供給にはスプレーダンプナーＳＳＤ−１２（サカタインクス株式会社製）を使用した。印刷に際しては、水幅の下限付近での印刷状態の比較を行うために、水幅の下限値よりもＳＳＤ−１２のダイヤルを２ポイント上げた状態とした。なお、印刷試験におけるベタ紙面濃度は、０．９５±０．０２とした。また、ベタ紙面濃度は、印刷物におけるベタ部の濃度をＳｐｅｃｔｒｏｅｙｅ濃度計（Ｇｒｅｔａｇｍａｃｂｅｔｈ社製）により測定した数値である。
[Print Evaluation]
For each of the printing ink compositions of Example 1 and Comparative Examples 1 to 3, using an N-750 type printing experimental machine (manufactured by Higashihama Seiki Co., Ltd.), paper is used for newspapers at a printing speed of 120,000 copies / hour A printing test was carried out at the following solid paper surface density as the renewal paper. Print 20,000 copies of each printing ink composition, and indicate the “slipping” state of the printing ink composition on the swim roller (the roller that supplies dampening water to the printing plate) after each printing. Evaluated by touch. The evaluation results are shown in the printing evaluation result column of Table 1. As dampening water in the printing test, tap water added with 0.7% SAH-7 (manufactured by Sakata Inx Co., Ltd., alkaline H solution) is used, and spray dampener SSD-12 ( Sakata Inx Co., Ltd.) was used. At the time of printing, in order to compare the printing state in the vicinity of the lower limit of the water width, the SSD-12 dial was raised by two points from the lower limit value of the water width. The solid paper surface density in the printing test was 0.95 ± 0.02. The solid paper surface density is a numerical value obtained by measuring the density of a solid part in a printed material with a Spectroeye densitometer (manufactured by Gretagmacbeth).
表１の印刷評価結果欄における評価基準は、下記の通りである。なお、下記において、ローラー上の印刷インキ組成物が指に付着することは、ローラー上でインキの固着（ねっぱり）が生じていないことを意味しており、ローラー上のインキ組成物が指に付着しないことは、ローラー上でインキの固着（ねっぱり）が生じていることを意味している。
◎：ローラー上のインキ組成物が指に付着し、その粘度も元のインキ組成物と同様だった
○：ローラー上のインキ組成物が指に付着したが、その粘度は元のインキ組成物よりもわずかに増加していた
×：ローラー上のインキ組成物が指に付着しない
The evaluation criteria in the print evaluation result column of Table 1 are as follows. In the following, the fact that the printing ink composition on the roller adheres to the finger means that the ink is not fixed (slipping) on the roller, and the ink composition on the roller does not adhere to the finger. The fact that it does not adhere means that the ink is fixed (slipping) on the roller.
A: The ink composition on the roller adhered to the finger, and its viscosity was the same as the original ink composition
○: The ink composition on the roller adhered to the finger, but the viscosity was slightly increased compared to the original ink composition. ×: The ink composition on the roller did not adhere to the finger.
［ミスチング評価］
実施例１、及び比較例１〜３の印刷インキ組成物のそれぞれについて、印刷インキ組成物を２．６ｃｃ採取し、これをインコメーター（東洋精機株式会社製）の回転ローラーに付着させた。次に、回転ローラーを４００ｒｐｍにて３０秒間回転させることにより、回転ローラー上で印刷インキ組成物の均一な膜を形成させ、その後、回転ローラーを１２００ｒｐｍにて２分間回転させ、その際のミスチング（印刷インキ組成物のごく微少な滴が霧状に飛散することを意味する。）した印刷インキ組成物をバイブレーションローラー下部に敷いた１０ｃｍ×１０ｃｍの用紙上に付着させ、この用紙上に付着した印刷インキ組成物の量を目視により評価した。試験は、温度２５℃、湿度５０％に維持された恒温恒湿室内にて実施した。結果を表１のミスチング評価結果欄に示す。
[Missing evaluation]
About each of the printing ink composition of Example 1 and Comparative Examples 1-3, 2.6 cc of printing ink composition was extract | collected and this was made to adhere to the rotating roller of an incometer (made by Toyo Seiki Co., Ltd.). Next, the rotating roller is rotated at 400 rpm for 30 seconds to form a uniform film of the printing ink composition on the rotating roller, and then the rotating roller is rotated at 1200 rpm for 2 minutes. This means that very small droplets of the printing ink composition are scattered in the form of a mist.) The printing ink composition is deposited on a 10 cm × 10 cm sheet laid under the vibration roller, and the printing deposited on this sheet The amount of the ink composition was visually evaluated. The test was conducted in a constant temperature and humidity room maintained at a temperature of 25 ° C. and a humidity of 50%. The results are shown in the misting evaluation result column of Table 1.
表１のミスチング評価欄における評価基準は、下記の通りである。なお、下記評価基準において「標準的」とは、試験対象である印刷インキ組成物と同等の粘度グレードである、市販のロジン変性フェノール樹脂タイプの印刷インキ組成物と同等程度であることを意味する。
◎：用紙上の汚れが殆ど無い（ミスチングが極めて少ない）
○：用紙上の汚れが標準的なものよりも若干少ない
△：用紙上の汚れが標準的なもの
×：用紙の汚れが標準的なものよりも多いもの
The evaluation criteria in the misting evaluation column of Table 1 are as follows. In the following evaluation criteria, “standard” means that the viscosity grade is equivalent to that of the printing ink composition being tested, and is equivalent to a commercially available rosin-modified phenolic resin type printing ink composition. .
A: There is almost no stain on the paper (very little misting)
○: Slightly less stains on the paper than standard △: Stain on the paper is normal ×: More paper stains than the standard
表１に示すように、本発明の製造方法で得られた印刷インキ組成物用顔料分散体を用いて印刷インキ組成物を調製すると、「ねっぱり」現象や「ミスチング」現象が抑制されて良好な結果となることがわかる。 As shown in Table 1, when a printing ink composition is prepared using the pigment dispersion for a printing ink composition obtained by the production method of the present invention, the “stickiness” phenomenon and the “misting” phenomenon are suppressed and good. It turns out that it becomes a result.
Claims (2)
前記水を除去する水除去工程と、を含む印刷インキ組成物用顔料分散体の製造方法。 A mixture containing powdery calcium carbonate surface-treated with a fatty acid, a water-containing organic pigment press cake, and a varnish for a printing ink composition is kneaded, and the calcium carbonate and the organic pigment are mixed with the varnish for a printing ink composition. A kneading step for dispersing in,
A method for producing a pigment dispersion for a printing ink composition, comprising a water removal step of removing the water.
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| US3963501A (en) * | 1974-07-30 | 1976-06-15 | Garlock Inc. | Process for preparing anti-mist compounds for printing inks and process for preparing printing inks containing same |
| JP2000281954A (en) * | 1999-03-31 | 2000-10-10 | Sakata Corp | Gel varnish for offset printing ink and offset printing ink composition using same |
| JP2003041173A (en) * | 2001-07-26 | 2003-02-13 | Dainichiseika Color & Chem Mfg Co Ltd | Method for producing printing ink and printing ink |
| JP3914132B2 (en) * | 2002-10-22 | 2007-05-16 | 大日精化工業株式会社 | Azo lake pigment composition, process for producing the same, and printing ink composition |
| EP1888697A4 (en) * | 2005-05-27 | 2010-02-24 | Sun Chemical Corp | Process for preparing a printing ink |
| WO2007119529A1 (en) * | 2006-03-28 | 2007-10-25 | Sakata Inx Corp. | Process for producing loading pigment dispersion for oil-based printing, loading pigment dispersion for oil-based printing obtained by the production process, and use thereof |
| JP5031730B2 (en) * | 2006-03-28 | 2012-09-26 | サカタインクス株式会社 | Method for producing oil-based printing extender pigment dispersion, oil-based printing extender pigment dispersion obtained by the production method, and use thereof |
| JP5031735B2 (en) * | 2006-03-28 | 2012-09-26 | サカタインクス株式会社 | Method for producing extender pigment dispersion for oil-based printing, extender pigment dispersion for oil-based printing obtained by the method, and use thereof |
| WO2007138972A1 (en) * | 2006-05-25 | 2007-12-06 | Sakata Inx Corp. | Process for producing loading pigment dispersion for oil-based-ink printing, loading pigment dispersion for oil-based-ink printing obtained by the process, and use thereof |
| JP5485610B2 (en) * | 2009-08-04 | 2014-05-07 | サカタインクス株式会社 | Penetration drying type ink composition for offset printing |
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