JP4623359B2 - Method for producing varnish composition for gravure printing ink - Google Patents

Method for producing varnish composition for gravure printing ink Download PDF

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JP4623359B2
JP4623359B2 JP2004070309A JP2004070309A JP4623359B2 JP 4623359 B2 JP4623359 B2 JP 4623359B2 JP 2004070309 A JP2004070309 A JP 2004070309A JP 2004070309 A JP2004070309 A JP 2004070309A JP 4623359 B2 JP4623359 B2 JP 4623359B2
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resin
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varnish composition
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政弘 佐山
敏裕 渡部
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Harima Chemical Inc
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Description

本発明はグラビア印刷インキ用ワニス組成物に関して、印刷時の紙への転移性を良好に確保しながら、印刷物の光沢と乾燥性のバランスに優れ、環境保全に資するものを提供する。   The present invention provides a varnish composition for gravure printing inks that is excellent in the balance between gloss and drying property of printed matter and contributes to environmental conservation while ensuring good transferability to paper during printing.

雑誌、週刊誌などに使用される出版グラビア印刷インキ用のワニス組成物としては、従来、ロジン系化合物と金属化合物との反応生成物である樹脂酸金属塩が汎用されており、例えば、特許文献1には、ロジンと不飽和カルボン酸と多価アルコールからなる樹脂酸反応物と2種以上の金属化合物をトルエン等の有機溶剤中で反応させて得られる樹脂酸金属塩をグラビア印刷インキ用のバインダーとすることが開示されている。
しかしながら、従来の樹脂酸金属塩を含有してなる出版グラビア印刷インキでは、近年、導入されてきた高速印刷機による高速印刷に際して、印刷物の光沢と乾燥性のバランス、印刷時の紙への転移性、或は、印刷後の耐ブロッキング性などの印刷品質が必ずしも満足できる水準にはなく、品質の向上が求められる。
As varnish compositions for publishing gravure printing inks used in magazines, weekly magazines, etc., resin acid metal salts that are reaction products of rosin compounds and metal compounds have been widely used, for example, patent literature 1, a resin acid metal salt obtained by reacting a resin acid reaction product composed of rosin, an unsaturated carboxylic acid and a polyhydric alcohol and two or more metal compounds in an organic solvent such as toluene is used for gravure printing inks. A binder is disclosed.
However, in the case of publication gravure printing inks containing conventional resin acid metal salts, the balance between gloss and dryness of printed matter and transferability to paper during printing has been achieved at the time of high-speed printing by a high-speed printing press introduced in recent years. Or, the printing quality such as blocking resistance after printing is not always at a satisfactory level, and improvement in quality is required.

さらに、出版グラビア印刷インキには、トルエンを初めとする芳香族炭化水素系溶剤が汎用されて来たが(例えば、上記特許文献1の製造例1〜5では、トルエン中で樹脂酸金属塩を製造している)、最近、トルエン等の芳香族系溶剤はVOC規制に代表される環境保全や労働安全衛生上の見地から使用に問題があり、芳香族炭化水素を含まない溶剤の使用が要請されている。   In addition, aromatic hydrocarbon solvents such as toluene have been widely used in published gravure printing inks (for example, in Production Examples 1 to 5 of Patent Document 1 described above, resin acid metal salts are contained in toluene. Recently, aromatic solvents such as toluene have problems in use from the viewpoint of environmental protection and occupational safety and health represented by VOC regulations, and use of solvents that do not contain aromatic hydrocarbons is required. Has been.

そこで、特許文献2には、環境問題や労働衛生の問題を解消するとともに、紙への転移性、印刷後の乾燥性、印刷物の光沢などを改善する目的で、ロジンとα,β−エチレン性不飽和カルボン酸からなる反応生成物と2種以上の金属化合物とを、シクロヘキサン、メチルシクロヘキサンなどの脂環族有機溶剤中で反応させて得られる樹脂酸金属塩を主成分とする印刷インキ用バインダーが開示されている。   Therefore, Patent Document 2 discloses rosin and α, β-ethylenic properties for the purpose of solving environmental problems and occupational health problems, and improving transferability to paper, drying properties after printing, gloss of printed matter, and the like. A binder for printing inks containing as a main component a resin acid metal salt obtained by reacting a reaction product comprising an unsaturated carboxylic acid with two or more metal compounds in an alicyclic organic solvent such as cyclohexane or methylcyclohexane. Is disclosed.

また、ロジン系化合物を使用した印刷インキ用ワニス組成物として、特許文献3には、ロジン変性フェノール樹脂と特定の水酸基価を有するアルキド樹脂を、例えば、230〜300℃の高温で2〜8時間程度共縮合させることにより、ミスチングなどを改善し、印刷物に均一な光沢を付与できるオフセット印刷インキ用のバインダーが開示されている(特許請求の範囲、第2頁左下欄〜右下欄及び第4頁右下欄参照)。
特開平6−41486号公報 特開2001−234105号公報 特開昭54−89808号公報
In addition, as a varnish composition for printing ink using a rosin compound, Patent Document 3 discloses a rosin-modified phenol resin and an alkyd resin having a specific hydroxyl value, for example, at a high temperature of 230 to 300 ° C. for 2 to 8 hours. Binders for offset printing ink that can improve misting and impart uniform gloss to printed matter by co-condensing to the extent are disclosed (Claims, page 2, lower left column to lower right column and fourth). (See the lower right column on the page).
JP-A-6-41486 JP 2001-234105 A JP-A-54-89808

有機溶剤中で樹脂酸金属塩を製造するにあたり、上記特許文献2のような脂環族溶剤をそのまま使用してグラビア印刷インキ用ワニスを製造すると、印刷時の紙への転移性、印刷物の光沢・透明性が従来の品質に及ばず、最近のグラビア印刷の高度な要求を満足するには至らないという実情がある。
また、上記特許文献3はオフセット印刷インキ用のもので、アルキド樹脂をロジン変性フェノール樹脂と共縮合反応することで、光沢に優れた印刷物を得ることを主目的としている。しかしながら、本発明の対象とするグラビア印刷とオフセット印刷では、印刷方式やインキ組成が異なり、例えば、版形式にあっては、オフセット印刷が主に平版であるのに対して、グラビア印刷では凹版を使用するため、インキに高い流動性が求められ、インキ溶剤としては低沸点の溶剤が使用される。このため、グラビア印刷にあっては、印刷後にインキに含まれるこの低沸点溶剤が蒸発することにより、印刷インキは乾燥することになる。
従って、同文献3の組成を出版グラビアインキに転用しても、ロジン変性フェノール樹脂を使用しているため、樹脂と有機溶剤の溶解性が高過ぎて溶剤離れが悪くなり、有機溶剤が残留して乾燥性が劣るため、最近の高速印刷の要求には対応できない。
When producing a resin acid metal salt in an organic solvent, if a varnish for gravure printing ink is produced using the alicyclic solvent as in Patent Document 2 above, the transferability to paper at the time of printing, the gloss of the printed matter, etc.・ There is a situation that transparency does not reach the conventional quality and does not satisfy the high demands of recent gravure printing.
Moreover, the said patent document 3 is an object for offset printing inks, and mainly aims at obtaining the printed matter excellent in gloss by carrying out the co-condensation reaction of alkyd resin with rosin modified phenol resin. However, the gravure printing and the offset printing that are the subject of the present invention have different printing methods and ink compositions.For example, in the plate format, offset printing is mainly a lithographic plate, whereas gravure printing uses an intaglio plate. In order to use, high fluidity | liquidity is calculated | required by ink, and a low boiling-point solvent is used as an ink solvent. For this reason, in gravure printing, the printing ink is dried by evaporating the low boiling point solvent contained in the ink after printing.
Therefore, even if the composition of the same document 3 is diverted to the publication gravure ink, since the rosin-modified phenol resin is used, the solubility of the resin and the organic solvent is too high and the separation of the solvent becomes worse, and the organic solvent remains. Because of its poor drying properties, it cannot respond to recent demands for high-speed printing.

本発明は、印刷時の紙への転移性を良好に確保しながら、印刷物の光沢と乾燥性のバランスなどに優れ、環境保全にも資する出版グラビア印刷インキ用のワニス組成物を開発することを技術的課題とする。   The present invention is to develop a varnish composition for publishing gravure printing ink that has excellent balance between gloss and dryness of printed matter and contributes to environmental conservation while ensuring good transferability to paper during printing. Technical issue.

本発明者らは、ロジン系樹脂と金属化合物からなる樹脂酸金属塩を用いたグラビア印刷、特に、最近の高速印刷にも充分に対応できる印刷性能を追及すべく鋭意研究した。
その結果、特許文献2と同様に、脂環式炭化水素系溶剤中で樹脂酸金属塩を調製する一方、特許文献2とは異なり、樹脂酸金属塩を単用することの問題点をアルキド樹脂との併用で補填することにより、また、特許文献3のようなロジン変性フェノール樹脂とアルキド樹脂を高温で反応させるのではなく、基本的に、不飽和カルボン酸変性ロジンの樹脂酸金属塩にアルキド樹脂を添加した混合物を使用することにより、印刷時の紙への転移性を良好に確保しながら、印刷物の光沢と乾燥性のバランスを良好に改善し、グラビア印刷(特に最近の高速印刷)の高度な要求にも充分に対応できることを見い出すとともに、脂環族溶剤の使用で環境保全にも貢献できることに鑑みて、本発明を完成した。
The present inventors have intensively studied to pursue gravure printing using a resin acid metal salt composed of a rosin resin and a metal compound, in particular, printing performance that can sufficiently cope with recent high-speed printing.
As a result, the resin acid metal salt is prepared in an alicyclic hydrocarbon-based solvent as in Patent Document 2, whereas the problem of using a resin acid metal salt alone is different from that of Patent Document 2 in terms of alkyd resin. In addition, the rosin-modified phenol resin and the alkyd resin are not reacted at a high temperature as in Patent Document 3, but alkyd is basically added to the resin acid metal salt of the unsaturated carboxylic acid-modified rosin. By using a resin-added mixture, it is possible to improve the balance between gloss and dryness of printed matter while ensuring good transfer to paper during printing, and for gravure printing (especially recent high-speed printing). The present invention has been completed in view of the fact that it can sufficiently cope with high demands and that it can contribute to environmental conservation by using an alicyclic solvent.

即ち、本発明1は、ロジン類とα,β−エチレン性不飽和カルボン酸からなる不飽和カルボン酸変性ロジンにアルキド樹脂を添加し、この混合物にマグネシウム、亜鉛、カルシウム、アルミニウム、リチウム、カリウム、ナトリウム、鉄、錫、チタニウムより選ばれた2種以上の金属種を含む金属化合物を加えて脂環式炭化水素系溶剤の中で反応させて樹脂酸金属塩を得るか、或は、
上記不飽和カルボン酸変性ロジンと上記2種以上の金属種を含む金属化合物を脂環式炭化水素系溶剤の中で反応させた樹脂酸金属塩に、アルキド樹脂を添加するとともに、
樹脂酸金属塩の固形分に対するアルキド樹脂の添加量が1〜20重量%であり、溶剤中での金属化合物との反応温度が40〜200℃であることを特徴とするグラビア印刷インキ用ワニス組成物の製造方法である。
That is, the present invention 1, rosins and alpha, were added β- ethylenically unsaturated carboxylic acid-modified rosin in the alkyd resin consisting of unsaturated carboxylic acids such as magnesium to the mixture, zinc, calcium, aluminum, lithium, potassium Adding a metal compound containing two or more metal species selected from sodium, iron, tin and titanium and reacting in an alicyclic hydrocarbon solvent to obtain a resin acid metal salt , or
While adding the alkyd resin to the resin acid metal salt obtained by reacting the unsaturated carboxylic acid-modified rosin and the metal compound containing two or more metal species in an alicyclic hydrocarbon solvent ,
The varnish composition for gravure printing inks, wherein the addition amount of the alkyd resin with respect to the solid content of the resin acid metal salt is 1 to 20% by weight, and the reaction temperature with the metal compound in the solvent is 40 to 200 ° C It is a manufacturing method of a thing.

本発明2は、上記本発明1において、不飽和カルボン酸変性ロジンのカルボキシル基に対する金属化合物の添加量が70〜120モル%であることを特徴とする請求項1に記載のグラビア印刷インキ用ワニス組成物の製造方法である。 Invention 2 is a varnish for gravure printing ink according to Claim 1, wherein the addition amount of the metal compound to the carboxyl group of the unsaturated carboxylic acid-modified rosin in the invention 1 is 70 to 120 mol%. It is a manufacturing method of a composition .

本発明3は、上記本発明1又は2において、脂環式炭化水素系溶剤が、シクロヘキサン、メチルシクロヘキサン、エチルシクロヘキサン、ジメチルシクロヘキサン及びメチルエチルシクロヘキサンの少なくとも1種であることを特徴とするグラビア印刷インキ用ワニス組成物の製造方法である。 Invention 3 is a gravure printing ink according to Invention 1 or 2, wherein the alicyclic hydrocarbon solvent is at least one of cyclohexane, methylcyclohexane, ethylcyclohexane, dimethylcyclohexane and methylethylcyclohexane. It is a manufacturing method of the varnish composition.

本発明4は、上記本発明1〜3のいずれかにおいて、金属化合物の金属種がマグネシウム及び亜鉛であることを特徴とするグラビア印刷インキ用ワニス組成物である。   Invention 4 is a varnish composition for gravure printing ink according to any one of Inventions 1 to 3, wherein the metal species of the metal compound are magnesium and zinc.

脂環族有機溶剤中で反応させて得られる樹脂酸金属塩を主成分とする上記特許文献2の印刷インキ用バインダーでは、印刷時の紙への転移性、印刷物の光沢・乾燥性で不充分な点が多い。
これに対して、本発明のワニス組成物は不飽和カルボン酸変性ロジンにアルキド樹脂を添加し、脂環族溶剤中で金属化合物を反応させて樹脂酸金属塩にするか、或は、脂環族溶剤中で樹脂酸金属塩にアルキド樹脂を添加したものなので、当該ワニス組成物から調製された印刷インキは、印刷時の紙への転移性を損なうことなく、光沢と乾燥性のバランスに優れる。従って、出版グラビア印刷においては、最近の高速印刷の要求にも充分に応えることができる。
また、上記特許文献1でも記載されているトルエンなどの芳香族系溶剤を使用せず、脂環式の炭化水素系溶剤を使用するため、環境保全や労働衛生にも資する。
The binder for printing inks of the above-mentioned Patent Document 2 mainly composed of a resin acid metal salt obtained by reacting in an alicyclic organic solvent is insufficient in terms of transferability to paper during printing and gloss / dryness of printed matter. There are many points.
In contrast, the varnish composition of the present invention is obtained by adding an alkyd resin to an unsaturated carboxylic acid-modified rosin and reacting a metal compound in an alicyclic solvent to form a resin acid metal salt, or Since the alkyd resin is added to the resin acid metal salt in the group solvent, the printing ink prepared from the varnish composition has an excellent balance between gloss and drying without impairing the transferability to paper during printing. . Therefore, the publication gravure printing can sufficiently meet the recent demand for high-speed printing.
In addition, since an aromatic solvent such as toluene described in Patent Document 1 is not used and an alicyclic hydrocarbon solvent is used, it contributes to environmental protection and occupational health.

ちなみに、特許文献3にはロジン変性フェノール樹脂とアルキド樹脂を高温で共縮合反応させたオフセット印刷インキ用のバインダーが開示されているが、前述したように、オフセットインキとグラビアインキは技術の土俵が全く異なり、この文献3の組成をグラビア印刷に適用しようとしても、乾燥性などの点で実用レベルのインキを得ることは困難である。   Incidentally, Patent Document 3 discloses a binder for offset printing ink obtained by co-condensation reaction of rosin-modified phenolic resin and alkyd resin at a high temperature. It is quite different, and even if it tries to apply the composition of this literature 3 to gravure printing, it is difficult to obtain a practical level ink in terms of dryness.

本発明は、ロジン類とα,β−エチレン性不飽和カルボン酸類からなる不飽和カルボン酸変性ロジンにアルキド樹脂を添加して、これらの混合物に脂環式炭化水素系溶剤中で金属化合物を反応させて得られる印刷インキ用ワニス組成物である。
上記ロジン類としては、ガムロジン、トール油ロジン、ウッドロジン、不均斉化ロジン、重合ロジンなどが挙げられる。
上記α,β−エチレン性不飽和カルボン酸類としては、マレイン酸、無水マレイン酸、フマル酸、イタコン酸、無水イタコン酸、シトラコン酸、アクリル酸、メタクリル酸などが挙げられる。
In the present invention, an alkyd resin is added to an unsaturated carboxylic acid-modified rosin composed of a rosin and an α, β-ethylenically unsaturated carboxylic acid, and the mixture is reacted with a metal compound in an alicyclic hydrocarbon solvent. It is a varnish composition for printing inks obtained.
Examples of the rosins include gum rosin, tall oil rosin, wood rosin, disproportionated rosin, and polymerized rosin.
Examples of the α, β-ethylenically unsaturated carboxylic acids include maleic acid, maleic anhydride, fumaric acid, itaconic acid, itaconic anhydride, citraconic acid, acrylic acid, and methacrylic acid.

上記ロジン類とα,β−エチレン性不飽和カルボン酸類は公知の方式で反応することができ、反応条件は特に制限されるものではない。反応温度は通常180〜250℃であり、反応時間は通常30分〜5時間、好ましくは1〜3時間である。
また、ロジン類に対するα,β−エチレン性不飽和カルボン酸類の添加量は通常0.5〜10重量%であり、好ましくは1〜8重量%である。添加量が少ないと、後述の金属導入量が不充分となり、インキにした場合に融点が低くなり高速印刷適性が著しく悪くなる。また、添加量が多いと、系の粘度が高くなりワニスがゲル化し、印刷インキの性能が低下する。
The rosins and α, β-ethylenically unsaturated carboxylic acids can be reacted in a known manner, and the reaction conditions are not particularly limited. The reaction temperature is usually 180 to 250 ° C., and the reaction time is usually 30 minutes to 5 hours, preferably 1 to 3 hours.
The amount of α, β-ethylenically unsaturated carboxylic acid added to the rosins is usually 0.5 to 10% by weight, preferably 1 to 8% by weight. If the amount added is small, the amount of metal introduced as described later will be insufficient, and when used as an ink, the melting point will be low and the high-speed printing suitability will be remarkably deteriorated. Moreover, when there is much addition amount, the viscosity of a system will become high and a varnish will gelatinize and the performance of printing ink will fall.

本発明に使用するアルキド樹脂は、多塩基酸と多価アルコールを植物油成分や植物油脂肪酸中で反応させたものであり、その合成方法は特に制限されず公知のアルキド樹脂を製造する場合と同様である。
上記多塩基酸には無水マレイン酸、無水フタル酸、イソフタル酸、フマル酸等が挙げられ、多価アルコールにはグリセリン、ペンタエリスリトール、トリメチロールプロパン等が挙げられる。また、上記植物油成分には大豆油、綿実油、アマニ油、サフラワー油、桐油、トール油、ヒマシ油、カノーラ油等の乾性油又は半乾性油が挙げられ、中でも、特にアマニ油、大豆油が好ましい。上記植物油脂肪酸には、ラウリン酸、トリデカン酸、ミリスチン酸、ペンタデカン酸、パルミチン酸、ステアリン酸、マルガリン酸、ノナデカン酸、アラギン酸、ベヘン酸、オレイン酸、リノール酸、リノレン酸等が挙げられる。また、使用される多塩基酸、多価アルコール、植物油成分や脂肪酸などは、公知の各成分を単用又は併用することができる。
上記アルキド樹脂の市販品としては、ハリエスターE−KW、ハリフタールSL−889(以上、ハリマ化成(株)製)などが好ましい。
The alkyd resin used in the present invention is a product obtained by reacting a polybasic acid and a polyhydric alcohol in a vegetable oil component or vegetable oil fatty acid, and its synthesis method is not particularly limited and is the same as that for producing a known alkyd resin. is there.
Examples of the polybasic acid include maleic anhydride, phthalic anhydride, isophthalic acid, and fumaric acid. Examples of the polyhydric alcohol include glycerin, pentaerythritol, and trimethylolpropane. Examples of the vegetable oil component include soybean oil, cottonseed oil, linseed oil, safflower oil, tung oil, tall oil, castor oil, canola oil, and other drying oils or semi-drying oils. preferable. Examples of the vegetable oil fatty acid include lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, stearic acid, margaric acid, nonadecanoic acid, alginate, behenic acid, oleic acid, linoleic acid, and linolenic acid. Moreover, as for the polybasic acid, polyhydric alcohol, vegetable oil component, fatty acid, and the like used, each known component can be used singly or in combination.
As a commercial item of the said alkyd resin, Harrier star E-KW, Hariftal SL-889 (above, Harima Chemicals Co., Ltd. product) etc. are preferable.

本発明では、上記アルキド樹脂の添加量は、不飽和カルボン酸変性ロジンと金属化合物が反応した樹脂酸金属塩の固形分に対して通常1〜20重量%の割合であり、3〜10重量%が好ましい。20重量%を越えると、樹脂酸金属塩の固形分の濃度が下がり過ぎて、アルキド樹脂の性状が強く顕現するため、インキの乾燥性が遅くなり、印刷物のブロッキングや印刷時の汚れの原因となる恐れがある。添加温度は60℃〜250℃が適当であり、安全性を考慮すると100℃以下が好ましい。 In the present invention, the amount of the alkyd resin added is usually 1 to 20% by weight based on the solid content of the resin acid metal salt obtained by reacting the unsaturated carboxylic acid-modified rosin and the metal compound , and 3 to 10% by weight. Is preferred. If it exceeds 20% by weight, the concentration of the solid content of the resin acid metal salt will be too low, and the properties of the alkyd resin will be strongly manifested, resulting in slow drying of the ink, causing print blocking and smearing during printing. There is a fear. The addition temperature is suitably 60 ° C to 250 ° C, and is preferably 100 ° C or less in consideration of safety.

本発明においては、ロジン類とα,β−エチレン性不飽和カルボン酸類を付加反応させた前記不飽和カルボン酸変性ロジンと上記アルキド樹脂を脂環式炭化水素系溶剤に溶解させた後、溶液状態にて金属化合物と中和反応させることにより、目的物である樹脂酸金属塩を得る。
上記不飽和カルボン酸変性ロジンを樹脂酸金属塩にする金属化合物は、マグネシウム、亜鉛、カルシウム、アルミニウム、リチウム、カリウム、ナトリウム、鉄、錫、チタニウムより選ばれた2種以上の金属種を含み、マグネシウムと亜鉛の2種の金属化合物の組み合わせが好ましい(本発明4参照)。1種類の金属で添加量を増やすと、中和反応性が悪くなり、金属の導入量が不充分となる。また、好ましい金属種としてマグネシウムと亜鉛の組み合わせを用いるのは、この2種の金属の組み合わせが顔料分散性において特に良好であり、プロセスカラー、墨においてバランスが最もとれているからである。
従って、上記中和反応で使用する金属化合物としては、2種以上の金属種を含む組み合わせであり、マグネシウムと亜鉛の2種の金属化合物の組み合わせが基本であるが、マグネシウムと亜鉛とカルシウム(或はアルミニウム)の3種の金属化合物なども好ましい。
化合物の形態としては、金属の酸化物、水酸化物、或は、酢酸やギ酸等の有機酸化合物などが挙げられる。
In the present invention, the unsaturated carboxylic acid-modified rosin obtained by addition reaction of rosins and α, β-ethylenically unsaturated carboxylic acids and the alkyd resin are dissolved in an alicyclic hydrocarbon solvent, and then in a solution state. The resin acid metal salt which is the target product is obtained by neutralization reaction with the metal compound.
The metal compound for converting the unsaturated carboxylic acid-modified rosin into a resin acid metal salt includes two or more metal species selected from magnesium, zinc, calcium, aluminum, lithium, potassium, sodium, iron, tin, and titanium, A combination of two metal compounds of magnesium and zinc is preferable (see the present invention 4). When the addition amount is increased with one kind of metal, the neutralization reactivity is deteriorated, and the amount of metal introduced is insufficient. Further, the combination of magnesium and zinc is used as a preferred metal species because the combination of these two metals is particularly good in pigment dispersibility, and the balance is best in process color and black .
Therefore, the metal compound used in the neutralization reaction is a combination containing two or more metal species, and is basically a combination of two metal compounds of magnesium and zinc, but magnesium, zinc and calcium (or Are also preferable.
Examples of the form of the compound include metal oxides, hydroxides, or organic acid compounds such as acetic acid and formic acid.

一般に、不飽和カルボン酸変性ロジンと金属化合物を中和反応させる方法としては、ロジンの金属塩を貧溶媒中で沈殿させて分離する沈殿法、有機溶剤にロジンを溶解して金属酸化物と反応させる溶剤法、或は、ロジンを高温で溶融して金属塩にする溶融法が公知である。このうち、インキ用樹脂ワニスにあっては、樹脂ワニスの透明性、溶剤に対する溶解性、系の均一性、粉体自然発火の危険がないことなどの点で、上記溶融法と溶剤法が有利であり、一般的に用いられている。
しかしながら、本発明のグラビア印刷インキ用樹脂ワニスは、印刷の高速化、耐ブロッキング適性などを考慮すれば、融点200℃以上の高融点樹脂組成物が好ましく、このような樹脂組成物を得るためには、第一に、金属化合物がより均一に反応する点、第二に、グラビア印刷に用いられる溶剤系中で反応させた方が経済的に有利である点から、本発明では溶剤法(即ち、脂環族溶剤中で反応させる方法)によりグラビア印刷インキ用樹脂ワニスを製造するのである。
In general, as a method of neutralizing the unsaturated carboxylic acid-modified rosin and the metal compound, a precipitation method in which the metal salt of the rosin is precipitated in a poor solvent and separated, and the rosin is dissolved in an organic solvent and reacted with the metal oxide. There are known solvent methods in which rosin is melted at a high temperature to form a metal salt. Among these, for the resin varnish for ink, the melting method and the solvent method are advantageous in terms of transparency of the resin varnish, solubility in the solvent, uniformity of the system, and no risk of spontaneous powder ignition. It is generally used.
However, the resin varnish for gravure printing ink of the present invention is preferably a high melting point resin composition having a melting point of 200 ° C. or higher in consideration of printing speed, blocking resistance and the like. In order to obtain such a resin composition Is the solvent method (i.e., because the metal compound reacts more uniformly, and secondly, it is economically advantageous to react in a solvent system used for gravure printing). The resin varnish for gravure printing ink is produced by a method of reacting in an alicyclic solvent.

上記溶剤法による中和反応にあっては、特に反応条件に制限を受けるものではなく、脂環式炭化水素系溶剤中にて公知の方式で行うことができる。反応に際して、無触媒下又は触媒の使用等についての規制も受けない。
金属化合物の使用量は不飽和カルボン酸変性ロジンのカルボキシル基を中和する量として、通常70〜120モル%を添加し、好ましくは80〜105モル%である。添加量が少ないと、融点が低いため高速印刷適性がかなり低下する。添加量が多いと、系に濁りが生じたり、粘度が高くなり、場合によってはゲル化するため、上記範囲を外れた金属の導入量は好ましくない。
The neutralization reaction by the solvent method is not particularly limited by the reaction conditions, and can be performed in a known manner in an alicyclic hydrocarbon solvent. In the reaction, there are no restrictions on the use of no catalyst or the use of a catalyst.
The amount of the metal compound used is usually 70 to 120 mol%, preferably 80 to 105 mol%, as an amount for neutralizing the carboxyl group of the unsaturated carboxylic acid-modified rosin. When the addition amount is small, the melting point is low, and thus the high-speed printability is considerably deteriorated. If the amount added is large, the system becomes turbid, the viscosity becomes high, and gelation occurs in some cases. Therefore, it is not preferable to introduce a metal outside the above range.

上記脂環式炭化水素系溶剤としては、本発明3に示すように、シクロヘキサン、メチルシクロヘキサン、エチルシクロヘキサン、ジメチルシクロヘキサン、メチルエチルシクロヘキサンなどを単用又は併用できる。
上記脂環族溶剤の使用量は、樹脂全体の固形分に対して10〜300重量%が適当であり、中でも30〜200重量%が好ましい。
また、本発明では、脂環族溶剤中での金属化合物との反応温度は、通常、40℃から溶剤の還流温度までの温度域(つまり40〜200℃程度)であり、好ましくは40〜150℃程度である。
上記温度範囲で金属化合物と反応させた後、徐々に昇温して、反応生成水と脂環族溶剤の共沸脱水により反応を完結させることが好ましい。
As the alicyclic hydrocarbon solvent, as shown in the present invention 3 , cyclohexane, methylcyclohexane, ethylcyclohexane, dimethylcyclohexane, methylethylcyclohexane and the like can be used singly or in combination.
10-300 weight% is suitable for the usage-amount of the said alicyclic solvent with respect to solid content of the whole resin, and 30-200 weight% is especially preferable.
In the present invention, the reaction temperature with the metal compound in the alicyclic solvent is usually in a temperature range from 40 ° C. to the reflux temperature of the solvent (that is , about 40 to 200 ° C.), preferably 40 to 150. It is about ℃.
After reacting with the metal compound in the above temperature range, it is preferable to gradually raise the temperature and complete the reaction by azeotropic dehydration of the reaction product water and the alicyclic solvent.

本発明のワニス組成物は、上述したように、不飽和カルボン酸変性ロジンにアルキド樹脂を先に添加して、これらの混合物に脂環族溶剤中で金属化合物を反応させて製造するが、不飽和カルボン酸変性ロジンに金属化合物を反応させて樹脂酸金属塩を調製してから、脂環族溶剤中でアルキド樹脂を後で添加して製造しても差し支えない。
但し、樹脂酸金属塩にアルキド樹脂を後添加する場合でも、アルキド樹脂を先に添加する方式と同様に、アルキド樹脂の添加量は樹脂酸金属塩の固形分に対して通常は1〜20重量%、好ましくは3〜10重量%であり、溶剤中の金属化合物との反応温度は通常は40〜200℃、好ましくは40〜150℃である。
As described above, the varnish composition of the present invention is produced by adding an alkyd resin to an unsaturated carboxylic acid-modified rosin and reacting the mixture with a metal compound in an alicyclic solvent. After preparing a resin acid metal salt by reacting a saturated carboxylic acid-modified rosin with a metal compound, an alkyd resin may be added later in an alicyclic solvent to produce the resin acid metal salt.
However, even when the alkyd resin is post-added to the resin acid metal salt, the addition amount of the alkyd resin is usually 1 to 20 weights based on the solid content of the resin acid metal salt, as in the method of adding the alkyd resin first. %, Preferably 3 to 10% by weight, and the reaction temperature with the metal compound in the solvent is usually 40 to 200 ° C, preferably 40 to 150 ° C.

本発明のグラビア印刷インキ用ワニス組成物はさらに溶剤を加えて粘度調整したり、各種の顔料、ワックス、添加剤などを混練して印刷インキ組成物に調製される。印刷インキ組成物は出版グラビア印刷用に適し、最近の高速印刷にも好適である。   The varnish composition for gravure printing ink of the present invention is prepared into a printing ink composition by adjusting the viscosity by adding a solvent or kneading various pigments, waxes, additives and the like. The printing ink composition is suitable for publishing gravure printing and also suitable for recent high speed printing.

以下、本発明の印刷インキ用ワニス組成物の実施例、当該ワニス組成物を用いた印刷インキの光沢、転移性、乾燥性の各種印刷性能評価試験例を述べる。また、実施例、試験例中の「%」、「部」は基本的に重量基準である。
尚、本発明は下記の実施例、試験例に拘束されるものではなく、本発明の技術的思想の範囲内で任意の変形をなし得ることは勿論である。
Hereinafter, examples of the varnish composition for printing ink of the present invention and various printing performance evaluation test examples of gloss, transferability and drying property of the printing ink using the varnish composition will be described. Further, “%” and “part” in Examples and Test Examples are basically based on weight.
The present invention is not limited to the following examples and test examples, and it is needless to say that arbitrary modifications can be made within the scope of the technical idea of the present invention.

《印刷インキ用ワニス組成物の実施例》
実施例1〜5は樹脂酸金属塩に対するアルキド樹脂の添加量を様々に変化させた例である。このうち、実施例1〜2は不飽和カルボン酸変性ロジンにアルキド樹脂を先に添加してから、金属化合物と反応させた例、実施例3〜5は樹脂酸金属塩にアルキド樹脂を後添加した例である。
一方、比較例1〜4のうち、比較例1〜2は上記特許文献1に準拠したもので、トルエン中で樹脂酸金属塩を製造してアルキド樹脂を併用しないブランク例である。比較例3〜4は上記特許文献2に準拠したもので、脂環式炭化水素系溶剤中で樹脂酸金属塩を製造してアルキド樹脂を併用しないブランク例である。
<< Example of Varnish Composition for Printing Ink >>
Examples 1 to 5 are examples in which the amount of alkyd resin added to the resin acid metal salt was varied. Of these, Examples 1 and 2 were examples in which an alkyd resin was first added to an unsaturated carboxylic acid-modified rosin and then reacted with a metal compound, and Examples 3 to 5 were a post-addition of an alkyd resin to a resin acid metal salt. This is an example.
On the other hand, among Comparative Examples 1 to 4, Comparative Examples 1 and 2 are based on the above Patent Document 1, and are blank examples in which a resin acid metal salt is produced in toluene and no alkyd resin is used in combination. Comparative Examples 3 and 4 are based on Patent Document 2 described above, and are blank examples in which a resin acid metal salt is produced in an alicyclic hydrocarbon solvent and no alkyd resin is used in combination.

(1)実施例1
攪拌機、水分離器付冷却器、温度計及び窒素ガス導入管を備えた4つ口フラスコにトール油ロジン100部を仕込んで加熱溶融した後、フマル酸5部を添加し、200℃で1時間反応を行った。次に、150℃まで冷却し、アルキド樹脂(ハリフタールSL−889;ハリマ化成(株)製)を7部添加して、1時間保温した。さらに、エチルシクロヘキサン100部を加えて当該樹脂を溶解した。
そして、水酸化カルシウム0.4部と酸化亜鉛3.7部を添加し、70℃で1時間保温した後、酸化マグネシウム5.3部を加えて徐々に昇温し、エチルシクロヘキサン環流下で脱水反応を行った。
反応終了後、粘度を25〜30秒(ザーンカップ#4;20℃)になるようエチルシクロヘキサンを加え、酸価24、不揮発分51%、粘度29秒(ザーンカップ#4;20℃)のワニス組成物を得た。
尚、樹脂酸金属塩の固形分に対するアルキド樹脂の添加量は6.3%である。
(1) Example 1
A 4-necked flask equipped with a stirrer, a cooler with a water separator, a thermometer, and a nitrogen gas introduction tube was charged with 100 parts of tall oil rosin and heated and melted. Reaction was performed. Next, it cooled to 150 degreeC, 7 parts of alkyd resins (Harifutar SL-889; Harima Kasei Co., Ltd. product) were added, and it heat-retained for 1 hour. Further, 100 parts of ethylcyclohexane was added to dissolve the resin.
Then, 0.4 part of calcium hydroxide and 3.7 parts of zinc oxide were added, and the mixture was kept at 70 ° C. for 1 hour, then 5.3 parts of magnesium oxide was added, and the temperature was gradually raised, followed by dehydration under reflux of ethylcyclohexane. Reaction was performed.
After completion of the reaction, ethylcyclohexane is added so that the viscosity is 25 to 30 seconds (Zahn cup # 4; 20 ° C.), and the varnish has an acid value of 24, a nonvolatile content of 51%, and a viscosity of 29 seconds (Zahn cup # 4; 20 ° C.). A composition was obtained.
The amount of alkyd resin added to the solid content of the resin acid metal salt is 6.3%.

(2)実施例2
実施例1と同様のフラスコにトール油ロジン100部を仕込んで加熱溶融した後、フマル酸5部を添加し、実施例1と同様の反応を行った。次に、150℃まで冷却し、アルキド樹脂(ハリフタールSL−889;ハリマ化成(株)製)を7部添加し、1時間保温した。さらに、メチルシクロヘキサン100部を加えて当該樹脂を溶解した。
そして、水酸化カルシウム0.4部と酸化亜鉛3.7部を添加し、70℃にて1時間保温した後、酸化マグネシウム5.3部を加えて徐々に昇温し、メチルシクロヘキサン環流下で脱水反応を行った。
反応終了後、実施例1と同様に粘度調整し、酸価27、不揮発分50%、粘度27秒(ザーンカップ#4;20℃)のワニス組成物を得た。
尚、樹脂酸金属塩の固形分に対するアルキド樹脂の添加量は6.3%である。
(2) Example 2
100 parts of tall oil rosin was charged into the same flask as in Example 1 and heated and melted. Then, 5 parts of fumaric acid was added, and the same reaction as in Example 1 was performed. Next, it cooled to 150 degreeC, 7 parts of alkyd resins (Harifutar SL-889; Harima Kasei Co., Ltd. product) were added, and it heat-retained for 1 hour. Further, 100 parts of methylcyclohexane was added to dissolve the resin.
Then, 0.4 part of calcium hydroxide and 3.7 parts of zinc oxide were added and kept at 70 ° C. for 1 hour, then 5.3 parts of magnesium oxide was added, and the temperature was gradually raised. A dehydration reaction was performed.
After completion of the reaction, the viscosity was adjusted in the same manner as in Example 1 to obtain a varnish composition having an acid value of 27, a non-volatile content of 50%, and a viscosity of 27 seconds (Zahn Cup # 4; 20 ° C.).
The amount of alkyd resin added to the solid content of the resin acid metal salt is 6.3%.

(3)実施例3
実施例1と同様のフラスコにトール油ロジン100部を仕込んで加熱溶融した後、フマル酸5部を添加し、実施例1と同様の反応を行った。次に、エチルシクロヘキサン100部を加えて当該樹脂を溶解した。
そして、水酸化カルシウム0.3部と酸化亜鉛3.6部を添加し、70℃にて1時間保温した後、酸化マグネシウム5.2部を加え徐々に昇温し、エチルシクロヘキサン環流下で脱水反応を行った。
脱水反応終了後、100℃でアルキド樹脂(ハリエスターE−KW;ハリマ化成(株)製)を5部添加し、30分攪拌した。最後に、実施例1と同様に粘度調整し、酸価24、不揮発分50%、粘度29秒(ザーンカップ#4;20℃)のワニス組成物を得た。
尚、樹脂酸金属塩の固形分に対するアルキド樹脂の添加量は4.5%である。
(3) Example 3
100 parts of tall oil rosin was charged into the same flask as in Example 1 and heated and melted. Then, 5 parts of fumaric acid was added, and the same reaction as in Example 1 was performed. Next, 100 parts of ethylcyclohexane was added to dissolve the resin.
Then, 0.3 part of calcium hydroxide and 3.6 parts of zinc oxide were added and kept at 70 ° C. for 1 hour, then 5.2 parts of magnesium oxide was added and the temperature was gradually raised, followed by dehydration under reflux of ethylcyclohexane. Reaction was performed.
After completion of the dehydration reaction, 5 parts of alkyd resin (Harristar E-KW; manufactured by Harima Chemicals Co., Ltd.) was added at 100 ° C., and the mixture was stirred for 30 minutes. Finally, the viscosity was adjusted in the same manner as in Example 1 to obtain a varnish composition having an acid value of 24, a nonvolatile content of 50%, and a viscosity of 29 seconds (Zahn cup # 4; 20 ° C.).
The amount of alkyd resin added to the solid content of the resin acid metal salt is 4.5%.

(4)実施例4
実施例1と同様のフラスコにトール油ロジン100部を仕込んで加熱溶融した後、フマル酸5部を添加し、実施例1と同様の反応を行った。次に、メチルシクロヘキサン100部を加えて当該樹脂を溶解した。
そして、水酸化カルシウム0.3部と酸化亜鉛3.6部を添加し、70℃にて1時間保温した後、酸化マグネシウム5.2部を加えて徐々に昇温し、メチルシクロヘキサン環流下で脱水反応を行った。
脱水反応終了後、100℃でアルキド樹脂(ハリエスターE−KW;ハリマ化成(株)製)を5部添加し、30分攪拌した。最後に、実施例1と同様に粘度調整し、酸価24、不揮発分50%、粘度29秒(ザーンカップ#4;20℃)のワニス組成物を得た。
尚、樹脂酸金属塩の固形分に対するアルキド樹脂の添加量は4.5%である。
(4) Example 4
100 parts of tall oil rosin was charged into the same flask as in Example 1 and heated and melted. Then, 5 parts of fumaric acid was added, and the same reaction as in Example 1 was performed. Next, 100 parts of methylcyclohexane was added to dissolve the resin.
Then, 0.3 part of calcium hydroxide and 3.6 parts of zinc oxide were added and kept at 70 ° C. for 1 hour, then 5.2 parts of magnesium oxide was added and the temperature was gradually raised. A dehydration reaction was performed.
After completion of the dehydration reaction, 5 parts of alkyd resin (Harristar E-KW; manufactured by Harima Chemicals Co., Ltd.) was added at 100 ° C., and the mixture was stirred for 30 minutes. Finally, the viscosity was adjusted in the same manner as in Example 1 to obtain a varnish composition having an acid value of 24, a nonvolatile content of 50%, and a viscosity of 29 seconds (Zahn cup # 4; 20 ° C.).
The amount of alkyd resin added to the solid content of the resin acid metal salt is 4.5%.

(5)実施例5
実施例1と同様のフラスコにトール油ロジン100部を仕込んで加熱溶融した後、フマル酸5部を添加し、実施例1と同様の反応を行った。次に、エチルシクロヘキサン100部を加えて当該樹脂を溶解した。
そして、水酸化カルシウム0.3部と酸化亜鉛3.6部を添加し、70℃にて1時間保温した後、酸化マグネシウム5.2部を加えて徐々に昇温し、エチルシクロヘキサン環流下で脱水反応を行った。
脱水反応終了後、100℃でアルキド樹脂(ハリフタールSL−889;ハリマ化成(株)製)を18部添加し、30分攪拌した。最後に、実施例1と同様に粘度調整して、酸価26、不揮発分49%、粘度29秒(ザーンカップ#4;20℃)のワニス組成物を得た。
尚、樹脂酸金属塩の固形分に対するアルキド樹脂の添加量は16.1%である。
(5) Example 5
100 parts of tall oil rosin was charged into the same flask as in Example 1 and heated and melted. Then, 5 parts of fumaric acid was added, and the same reaction as in Example 1 was performed. Next, 100 parts of ethylcyclohexane was added to dissolve the resin.
Then, 0.3 part of calcium hydroxide and 3.6 parts of zinc oxide were added and kept at 70 ° C. for 1 hour. Then, 5.2 parts of magnesium oxide was added and the temperature was gradually raised. A dehydration reaction was performed.
After completion of the dehydration reaction, 18 parts of alkyd resin (Harifutar SL-889; manufactured by Harima Chemical Co., Ltd.) was added at 100 ° C., and the mixture was stirred for 30 minutes. Finally, the viscosity was adjusted in the same manner as in Example 1 to obtain a varnish composition having an acid value of 26, a non-volatile content of 49%, and a viscosity of 29 seconds (Zahn Cup # 4; 20 ° C.).
The amount of alkyd resin added to the solid content of the resin acid metal salt is 16.1%.

(6)比較例1
実施例1と同様のフラスコに、トール油ロジン100部を仕込んで加熱溶融した後、フマル酸5部を添加し、200℃で1時間反応した。次に、トルエン100部を加えて当該樹脂を溶解した。
そして、水酸化カルシウム0.4部と酸化亜鉛3.7部を添加し、70℃にて1時間保温した後、酸化マグネシウム5.5部を添加して徐々に昇温し、トルエン環流下で脱水反応を行った。
反応終了後、粘度調整を行って、酸価28、不揮発分52%、粘度28秒(ザーンカップ#4;20℃)のワニス組成物を得た。
(6) Comparative Example 1
In a flask similar to that in Example 1, 100 parts of tall oil rosin was charged and melted by heating. Then, 5 parts of fumaric acid was added and reacted at 200 ° C. for 1 hour. Next, 100 parts of toluene was added to dissolve the resin.
Then, 0.4 part of calcium hydroxide and 3.7 parts of zinc oxide are added and kept at 70 ° C. for 1 hour, and then 5.5 parts of magnesium oxide is added and the temperature is gradually raised. A dehydration reaction was performed.
After completion of the reaction, the viscosity was adjusted to obtain a varnish composition having an acid value of 28, a non-volatile content of 52%, and a viscosity of 28 seconds (Zahn Cup # 4; 20 ° C.).

(7)比較例2
実施例1と同様のフラスコに、ガムロジン100部を仕込んで加熱溶融した後、フマル酸5部を添加し、200℃で1時間反応した。次に、トルエン100部を加えて当該樹脂を溶解した。
そして、水酸化カルシウム0.4部と酸化亜鉛3.7部を添加し、70℃にて1時間保温した後、酸化マグネシウム5.5部を添加して徐々に昇温し、トルエン環流下で脱水反応を行った。
反応終了後、粘度調整を行って、酸価29、不揮発分51%、粘度29秒(ザーンカップ#4;20℃)のワニス組成物を得た。
(7) Comparative example 2
In the same flask as in Example 1, 100 parts of gum rosin was charged and heated and melted. Then, 5 parts of fumaric acid was added and reacted at 200 ° C. for 1 hour. Next, 100 parts of toluene was added to dissolve the resin.
Then, 0.4 part of calcium hydroxide and 3.7 parts of zinc oxide are added and kept at 70 ° C. for 1 hour, and then 5.5 parts of magnesium oxide is added and the temperature is gradually raised. A dehydration reaction was performed.
After completion of the reaction, the viscosity was adjusted to obtain a varnish composition having an acid value of 29, a nonvolatile content of 51%, and a viscosity of 29 seconds (Zahn Cup # 4; 20 ° C.).

(8)比較例3
上記比較例1を基本として、有機溶剤をトルエン100部からエチルシクロヘキサン100部に変更した以外は、比較例1と同様に処理して、酸価24、不揮発分49%、粘度28秒(ザーンカップ#4;20℃)のワニス組成物を得た。
(8) Comparative Example 3
Based on Comparative Example 1 above, except that the organic solvent was changed from 100 parts of toluene to 100 parts of ethylcyclohexane, the same treatment as in Comparative Example 1 was carried out to obtain an acid value of 24, a nonvolatile content of 49%, a viscosity of 28 seconds (Zahn cup # 4; 20 ° C.) was obtained.

(9)比較例4
上記比較例1を基本として、有機溶剤をトルエン100部からメチルシクロヘキサン100部に変更した以外は、比較例1と同様に処理して、酸価22、不揮発分48%、粘度29秒(ザーンカップ#4;20℃)のワニス組成物を得た。
(9) Comparative Example 4
Based on the above Comparative Example 1, except that the organic solvent was changed from 100 parts of toluene to 100 parts of methylcyclohexane, the same treatment as in Comparative Example 1 was carried out to obtain an acid value of 22, a non-volatile content of 48%, a viscosity of 29 seconds (Zahn cup # 4; 20 ° C.) was obtained.

《グラビア印刷インキの調製例並びに当該インキの性能評価試験例》
上記実施例1〜及び比較例1〜で得られた各ワニス組成物90部に、紅顔料(カーミン6B)10部を添加し、ペイントシェーカーを用いて1時間分散した。
次に、上記インキに実施例又は比較例で使用した各溶剤を追加し、粘度12秒(ザーンカップ#3;20℃)の紅グラビアインキを調製した。
得られた各紅インキを簡易グラビア印刷機を用いて中質コート紙に印刷し、光沢、転移性、乾燥性の各種評価試験を行った。
上記光沢及び転移性は目視により下記基準にて5段階評価した。また、上記乾燥性はインキをコート紙にバーコーターNo.10を用いて展色した後、指触により下記基準にて5段階評価した。
[評価基準]
非常に良好:5 良好4 普通:3 劣る:2 非常に劣る:1
<Preparation example of gravure printing ink and performance evaluation test example of the ink>
To 90 parts of each varnish composition obtained in Examples 1 to 5 and Comparative Examples 1 to 4 , 10 parts of a red pigment (Kermin 6B) was added and dispersed for 1 hour using a paint shaker.
Next, each of the solvents used in Examples or Comparative Examples was added to the ink to prepare a red gravure ink having a viscosity of 12 seconds (Zahn Cup # 3; 20 ° C.).
Each of the obtained red inks was printed on medium-coated paper using a simple gravure printing machine, and various evaluation tests for gloss, transferability, and drying were performed.
The gloss and transferability were visually evaluated in five levels according to the following criteria. Further, the drying property was evaluated on a coated paper with a bar coater No. 10 and then evaluated on a scale of 5 according to the following criteria by finger touch.
[Evaluation criteria]
Very good: 5 Good 4 Normal: 3 Inferior: 2 Very inferior: 1

図1はその試験結果である。
実施例1〜4では、印刷物の光沢と乾燥性の評価は共に4〜5であって優れたバランスを示し、紙への転移性も4〜5の優れた評価であった。実施例5についても、光沢と転移性は良好な評価であり、乾燥性も実施例1〜4に準じた評価であった。
従って、実施例1〜5のワニス組成物を用いて印刷インキを調製すれば、紙への転移性を損なうことなく、印刷物の光沢や乾燥性のバランスにも優れる。しかも、従来のトルエンなどの芳香族系溶剤を用いないでも、脂環族溶剤の使用によって(且つ、脂環族溶剤ならその種類を問わず)、グラビア印刷での各種印刷性能を良好に向上できることから、環境保全、労働衛生にも資する。
但し、樹脂酸金属塩の固形分に対するアルキド樹脂の添加量は1〜20重量%が適当であるが、上記実施例5では、アルキド樹脂の添加量が20重量%付近であって、アルキド樹脂の長所及び短所が印刷性能に強く顕現し易くなり、併用する樹脂酸金属塩の影響力が少し弱められることが推測されるため、光沢、乾燥性及び転移性の総合評価をより良く改善するには、実施例1〜4に示すように、3〜10重量%の範囲内に限定することがより好ましい。
FIG. 1 shows the test results.
In Examples 1 to 4, the gloss and dryness of the printed matter were both 4 to 5, indicating an excellent balance, and the transferability to paper was also an excellent evaluation of 4 to 5. Also in Example 5, the gloss and transferability were good evaluations, and the drying property was also an evaluation according to Examples 1-4.
Therefore, if a printing ink is prepared using the varnish compositions of Examples 1 to 5, the printed matter is excellent in balance of gloss and drying properties without impairing transferability to paper. Moreover, without using conventional aromatic solvents such as toluene, the use of alicyclic solvents (and any type of alicyclic solvents) can improve various printing performances in gravure printing. To contribute to environmental conservation and occupational health.
However, the addition amount of the alkyd resin relative to the solid content of the resin acid metal salt is suitably 1 to 20% by weight, but in Example 5 above, the addition amount of the alkyd resin is around 20% by weight, and the alkyd resin To improve the overall evaluation of gloss, dryness and transferability better because the strengths and weaknesses are strongly manifested in the printing performance and the influence of the resin acid metal salt used in combination is presumed to be slightly reduced. As shown in Examples 1 to 4, it is more preferable to limit the amount within the range of 3 to 10% by weight.

これに対して、いわば上記特許文献1に準拠し、トルエンを溶剤に使用して樹脂酸金属塩を製造し、アルキド樹脂を併用しないブランク例である比較例1〜2では、光沢の評価は3〜4、同じく乾燥性は4、紙への転移性は4であって、光沢、乾燥性及び転移性の総合評価は実施例1〜4より劣ることが確認できた。
従って、上記実施例1〜4をこの比較例1〜2に対比すると、グラビア印刷、特に最近の高速印刷に要求される高度な印刷性能を満たすには、樹脂酸金属塩を単用するだけでは足りず、樹脂酸金属塩にアルキド樹脂を併用することが必要である点が明らかになった。 また、いわば上記特許文献2に準拠し、脂環族溶剤を用いて樹脂酸金属塩を製造し、アルキド樹脂を併用しないブランク例である比較例3〜4では、光沢の評価は2〜3、同じく乾燥性は2又は5、紙への転移性は2〜3であって、光沢、乾燥性及び転移性の総合評価は比較例1〜2よりさらに劣ることが確認できた。このことは、従来の芳香族系溶剤を用いて得られたワニス組成物をインキ化する場合より、環境保全などに資する脂環族溶剤を用いると、グラビア印刷性能の充分な確保が容易でないことを示すが、本発明のように、アルキド樹脂を併用することにより、この問題を円滑に解消して、光沢、乾燥性、転移性をバランス良く改善できる。
In contrast, in Comparative Examples 1 and 2, which are blank examples in which a resin acid metal salt is produced using toluene as a solvent and no alkyd resin is used in accordance with the above-mentioned Patent Document 1, the gloss evaluation is 3 -4, the drying property was 4, and the transferability to paper was 4, and it was confirmed that the overall evaluation of gloss, drying property and transferability was inferior to that of Examples 1-4.
Therefore, when Examples 1-4 are compared with Comparative Examples 1-2, in order to satisfy the advanced printing performance required for gravure printing, particularly recent high-speed printing, it is necessary to use a single resin acid metal salt. Insufficiently, it became clear that it was necessary to use alkyd resin together with resin acid metal salt. Moreover, based on the said patent document 2, it manufactures a resin acid metal salt using an alicyclic solvent, and the comparative examples 3-4 which are the blank examples which do not use an alkyd resin together, evaluation of gloss is 2-3, Similarly, the drying property was 2 or 5, the transfer property to paper was 2-3, and it was confirmed that the overall evaluation of gloss, drying property and transfer property was further inferior to those of Comparative Examples 1-2. This means that it is not easy to ensure sufficient gravure printing performance when using an alicyclic solvent that contributes to environmental conservation, etc., compared to the case where a varnish composition obtained using a conventional aromatic solvent is made into an ink. However, by using the alkyd resin together as in the present invention, this problem can be solved smoothly and the gloss, drying property and transferability can be improved in a well-balanced manner.

以上のように、本発明のグラビア印刷インキ用ワニス組成物を使用することで、印刷時の紙への転移性を良好に確保しながら、印刷物の光沢と乾燥性をバランス良く向上できる。このため、最近のグラビア印刷、特に高速印刷の高度な要求にも充分に応えることができる。
また、前記特許文献3には、ロジン変性フェノール樹脂とアルキド樹脂を高温で共縮合反応させたオフセット印刷インキ用のバインダーが開示されているが、同文献3の組成を本発明の対象である出版グラビア印刷インキに転用しても、ロジン変性フェノール樹脂を使用しているため、樹脂と有機溶剤の溶解性が高過ぎて溶剤離れが悪くなり、乾燥性が劣って、最近の高速印刷にはまず対応できない。即ち、本発明では、同文献3のロジン変性フェノール樹脂ではなく、不飽和カルボン酸変性ロジンの樹脂酸金属塩にアルキド樹脂を組み合わせることにより、グラビア印刷の高度な要求にも充分に応えることができる。
As described above, by using the varnish composition for a gravure printing ink of the present invention, it is possible to improve the gloss and drying properties of the printed matter in a well-balanced manner while ensuring good transferability to paper during printing. For this reason, it can fully meet the advanced demands of recent gravure printing, particularly high-speed printing.
Further, Patent Document 3 discloses a binder for offset printing ink obtained by co-condensation reaction of rosin-modified phenol resin and alkyd resin at a high temperature. The composition of Patent Document 3 is a subject of the present invention. Even if diverted to gravure printing ink, rosin-modified phenolic resin is used, so the solubility of the resin and organic solvent is too high, the separation of the solvent is poor, and the drying property is inferior. I can not cope. That is, in the present invention, it is possible to sufficiently meet the high demands of gravure printing by combining an alkyd resin with a resin acid metal salt of an unsaturated carboxylic acid-modified rosin instead of the rosin-modified phenol resin of the document 3. .

実施例1〜5及び比較例1〜4で得られた各ワニス組成物を用いて調製したグラビア印刷インキの光沢、乾燥性、転移性の各種印刷性能評価試験の結果を示す図表である。It is a graph which shows the result of various printing performance evaluation tests of the glossiness, dryness, and transferability of the gravure printing ink prepared using each varnish composition obtained in Examples 1-5 and Comparative Examples 1-4.

Claims (4)

ロジン類とα,β−エチレン性不飽和カルボン酸からなる不飽和カルボン酸変性ロジンにアルキド樹脂を添加し、この混合物にマグネシウム、亜鉛、カルシウム、アルミニウム、リチウム、カリウム、ナトリウム、鉄、錫、チタニウムより選ばれた2種以上の金属種を含む金属化合物を加えて脂環式炭化水素系溶剤の中で反応させて樹脂酸金属塩を得るか、或は、
上記不飽和カルボン酸変性ロジンと上記2種以上の金属種を含む金属化合物を脂環式炭化水素系溶剤の中で反応させた樹脂酸金属塩に、アルキド樹脂を添加するとともに、
樹脂酸金属塩の固形分に対するアルキド樹脂の添加量が1〜20重量%であり、溶剤中での金属化合物との反応温度が40〜200℃であることを特徴とするグラビア印刷インキ用ワニス組成物の製造方法
Rosins and alpha, beta-ethylenically consisting unsaturated carboxylic acid compound is added unsaturated carboxylic acid-modified rosin alkyd resins, magnesium to the mixture, zinc, calcium, aluminum, lithium, potassium, sodium, iron, tin, Add a metal compound containing two or more metal species selected from titanium and react in an alicyclic hydrocarbon solvent to obtain a resin acid metal salt , or
While adding the alkyd resin to the resin acid metal salt obtained by reacting the unsaturated carboxylic acid-modified rosin and the metal compound containing two or more metal species in an alicyclic hydrocarbon solvent ,
The varnish composition for gravure printing inks, wherein the addition amount of the alkyd resin with respect to the solid content of the resin acid metal salt is 1 to 20% by weight, and the reaction temperature with the metal compound in the solvent is 40 to 200 ° C Manufacturing method .
不飽和カルボン酸変性ロジンのカルボキシル基に対する金属化合物の添加量が70〜120モル%であることを特徴とする請求項1に記載のグラビア印刷インキ用ワニス組成物の製造方法。The method for producing a varnish composition for gravure printing ink according to claim 1, wherein the addition amount of the metal compound with respect to the carboxyl group of the unsaturated carboxylic acid-modified rosin is 70 to 120 mol%. 脂環式炭化水素系溶剤が、シクロヘキサン、メチルシクロヘキサン、エチルシクロヘキサン、ジメチルシクロヘキサン及びメチルエチルシクロヘキサンの少なくとも1種であることを特徴とする請求項1又は2に記載のグラビア印刷インキ用ワニス組成物の製造方法Alicyclic hydrocarbon solvents, cyclohexane, methylcyclohexane, ethylcyclohexane, gravure printing ink varnish composition according to claim 1 or 2, characterized in that at least one of dimethyl cyclohexane and methyl ethyl cyclohexane Manufacturing method . 金属化合物の金属種がマグネシウム及び亜鉛であることを特徴とする請求項1〜3のいずれか1項に記載のグラビア印刷インキ用ワニス組成物の製造方法The method for producing a varnish composition for a gravure printing ink according to any one of claims 1 to 3, wherein the metal species of the metal compound are magnesium and zinc.
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