JPH1046088A - Additive for printing ink and printing ink composition containing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition capable of preventing an ink from leaving in the roller part, printing plate part and blanket part of an offset printing machine by adding a printing ink additive comprising porous starch having many pores reaching from the surfaces of the particle to the inner parts. SOLUTION: A rosin-modified phenolic resin, linseed oil and gas oil are heated at 200 deg.C to produce a varnish. The varnish is mixed with a pigment, gas oil, a drying-accelerating agent comprising cobalt octanoate, manganese naphthalate, etc., and 0.1-10wt.% of a printing ink additive comprising porous starch prepared by treating starch with an amylolytic enzyme and having an average particle diameter of 0.5-30μm and a pore diameter of 0.1-10μm, and subsequently kneaded by the use of a three roll mill to obtain the objective printing ink composition, in which the resin varnish and the solvent are impregnated into the holes of the starch particles to improve the dispensability of the starch particles, which is stable over a long period without precipitating the starch particles, and which does not cause troubles such as the leaving of the ink in the roller part, printing plate part and blanket part of an offset printing machine on offset printing.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、樹脂ワニスとの分
散安定性が良好で印刷インキ、特に枚葉オフセット印刷
用インキに添加し、裏移り防止性が良好で、印刷インキ
堆積抑制、光沢低下抑制に有効な微粒子から成る印刷イ
ンキ用添加剤に関し、更には、それを含む印刷インキ組
成物に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has good dispersion stability with resin varnish and is added to printing inks, especially inks for sheet-fed offset printing, has good set-off prevention properties, suppresses printing ink deposition, and reduces gloss. The present invention relates to a printing ink additive composed of fine particles effective for suppression, and further relates to a printing ink composition containing the additive.

【０００２】[0002]

【従来の技術】枚葉オフセット印刷用インキは、乾燥性
が良くないため印刷直後のインキ表面は付着性が極めて
強い。そのため、印刷機のデリバリー部で、次に印刷さ
れて重ねられた枚葉紙の裏面に、印刷直後の乾燥してい
ない印刷インキが裏移りする。2. Description of the Related Art Ink for sheet-fed offset printing has poor drying properties, and thus the ink surface immediately after printing has extremely strong adhesion. Therefore, in the delivery section of the printing press, the printing ink that has not been dried immediately after printing is set off on the back surface of the next printed and stacked sheet.

【０００３】上述した問題を避けるために、印刷直後の
乾燥していない印刷インキ層にトウモロコシ澱粉、ウル
チ米澱粉、工業用澱粉等を主成分とする粉末をスプレー
散布し、クッション層を形成させ、印刷インキの裏移り
を防止する方法が古くから行われている。しかしなが
ら、この方法では作業環境や最終製品の品質を悪くする
欠点を有していた。[0003] In order to avoid the above-mentioned problems, a powder containing corn starch, wool rice starch, industrial starch or the like as a main component is sprayed on a printing ink layer that has not been dried immediately after printing to form a cushion layer. Methods of preventing set-off of printing ink have been used for a long time. However, this method has a drawback of deteriorating the working environment and the quality of the final product.

【０００４】そのため、印刷インキに直接トウモロコシ
澱粉やウルチ米澱粉の粉末を添加し、印刷インキの裏移
りを防止する方法が、昭和３０年ごろから採用され続け
てきた。しかしながら、上述の澱粉を直接印刷インキに
添加する方法では、特に、印刷時に水を使用する平版印
刷においては、印刷機のローラー部、版部、ブランケッ
ト部に印刷インキ残渣が堆積する現象（所謂インキ残
り）が起り、印刷物の光沢が低下したり、鮮明な印刷画
像が得られないなどの印刷適性上好ましくない問題が発
生した。[0004] For this reason, a method of adding corn starch or wool rice starch powder directly to printing ink to prevent set-off of the printing ink has been used since about 1955. However, in the above-described method of directly adding starch to a printing ink, particularly in lithographic printing using water at the time of printing, a phenomenon in which printing ink residue accumulates on a roller portion, a plate portion, and a blanket portion of a printing press (so-called ink). (Residual) occurs, and unfavorable problems in printability, such as a decrease in gloss of the printed matter and inability to obtain a clear printed image.

【０００５】澱粉を直接印刷インキに添加せずに、印刷
インキ用ワニス類とあらかじめ混練りして、コンパウン
ド状にし、十分熟成した後に印刷インキに添加する方法
もあるが、この方法でも印刷インキが印刷機のローラー
部、版部、ブランケット部に残る問題を解決することは
出来なかった。[0005] There is also a method in which starch is not directly added to printing ink, but is kneaded in advance with a varnish for printing ink to form a compound, which is then sufficiently aged, and then added to printing ink. The problem remaining in the roller, plate and blanket sections of the printing press could not be solved.

【０００６】又、工業用澱粉の表面を、シリコーン樹
脂、アルキッド樹脂等で処理した処理澱粉を印刷インキ
に添加する方法も用いられているが、未加工の工業用澱
粉を添加した場合と同等の「インキ残り」を生じ、十分
満足できるものではなかった。[0006] In addition, a method of adding a treated starch obtained by treating the surface of an industrial starch with a silicone resin, an alkyd resin or the like to a printing ink has been used, but the same method as when an unprocessed industrial starch is added is used. "Ink residue" occurred and was not satisfactory.

【０００７】[0007]

【発明が解決しようとする課題】本発明は、前述の枚葉
オフセット印刷の際に発生する印刷上のトラブル、即ち
印刷機ローラー部、版部、ブランケット部の「インキ残
り」、印刷された印刷物を積み重ねたときの裏移り、従
来の澱粉粒子を添加したときの印刷物の光沢低下等の問
題解決を図ることを目的としている。SUMMARY OF THE INVENTION The present invention is directed to a printing problem that occurs during the above-described sheet-fed offset printing, that is, "ink residue" in a printing press roller section, a plate section, and a blanket section, and a printed printed matter. It is an object of the present invention to solve problems such as set-off when stacking, and decrease in gloss of printed matter when conventional starch particles are added.

【０００８】[0008]

【課題を解決するための手段】本発明者らは、上記の課
題を解決すべく鋭意研究を重ねた結果、本発明を完成す
るに到った。即ち本発明は、粒子表面から内部に通じる
孔を多数有する澱粉粒子（以後、有孔澱粉と記載する）
からなる印刷インキ用添加剤及びそれを含む印刷インキ
に関するものである。Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have completed the present invention. That is, the present invention provides a starch particle having a large number of pores extending from the particle surface to the inside (hereinafter referred to as perforated starch).
And a printing ink containing the same.

【０００９】本発明の第一の構成は、粒子表面から内部
に通じる孔を多数有する有孔澱粉からなることを特徴と
する印刷インキ用添加剤である。又、本発明の第一の構
成は前記した有孔澱粉粒子が分解酵素により処理して有
孔である澱粉粒子である印刷インキ用添加剤である。更
に、有孔澱粉粒子の平均粒径が、０．５〜３０μｍで、
孔径が０．１〜１０μｍある印刷インキ用添加剤であ
る。A first aspect of the present invention is an additive for printing ink comprising a porous starch having a large number of pores extending from the particle surface to the inside. Further, a first constitution of the present invention is an additive for printing ink, wherein the above-mentioned perforated starch particles are perforated starch particles treated with a decomposing enzyme. Further, the average particle size of the perforated starch particles is 0.5 to 30 μm,
It is a printing ink additive having a pore size of 0.1 to 10 μm.

【００１０】本発明の第二の構成は前記した有孔澱粉粒
子からなる印刷インキ用添加剤を含有することを特徴と
する印刷インキ組成物である。更に印刷インキ用添加剤
の含有量が０．１〜１０重量％である印刷インキ組成物
である。[0010] A second aspect of the present invention is a printing ink composition comprising the above-mentioned additive for printing ink comprising perforated starch particles. Furthermore, it is a printing ink composition in which the content of the printing ink additive is 0.1 to 10% by weight.

【００１１】[0011]

【発明の実施の形態】本発明において分解酵素により孔
をあけた澱粉粒子としては、生澱粉分解酵素（グルコア
ミラーゼ、α−アミラーゼ混合物）が作用する澱粉であ
ればどのような澱粉でも良いが、とうもろこし澱粉が最
も適している。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the starch particles pierced by a degrading enzyme may be any starch as long as it is a starch on which a raw starch degrading enzyme (glucoamylase, α-amylase mixture) acts. Corn starch is most suitable.

【００１２】本発明の有孔澱粉の平均粒子径としては、
特に限定されるものではないが、最大の裏移り防止効果
と最小のインキ残りを両立させるためには、０．５〜３
０μｍのものが好ましく、特に２〜１５μｍ程度の粒子
径がより好ましい。また、孔径としては０．１〜１０μ
ｍのものが好ましく、０．１〜２μｍがより好ましい。The average particle size of the porous starch of the present invention is as follows:
Although not particularly limited, in order to achieve both the maximum set-off prevention effect and the minimum ink residue, 0.5 to 3
The particles having a particle diameter of 0 μm are preferable, and the particle diameter of about 2 to 15 μm is more preferable. The pore size is 0.1 to 10 μm
m, and more preferably 0.1 to 2 μm.

【００１３】又、本発明により得られた添加剤を印刷イ
ンキに添加する場合、印刷インキに対する澱粉の量は
０．１〜１０重量％が好ましい。０．１重量％より少な
いと、裏移り防止効果が少なく、１０％より多いと、印
刷時のインキ残りが多くなったり、印刷物の光沢が低下
し、印刷物の品質が劣化する。より好ましくは、０．５
〜１．５重量％である。When the additive obtained according to the present invention is added to a printing ink, the amount of starch based on the printing ink is preferably 0.1 to 10% by weight. If the amount is less than 0.1% by weight, the effect of preventing set-off is small, and if it is more than 10%, the amount of ink remaining during printing is increased, the gloss of the printed matter is reduced, and the quality of the printed matter is deteriorated. More preferably, 0.5
~ 1.5% by weight.

【００１４】本発明に係わる印刷インキを製造するに
は、何れも従来技術と同様でよい。例えばロジン変性フ
ェノール樹脂、アルキッド樹脂、石油樹脂等の如き合成
樹脂、アマニ油、キリ油等の如き乾性油及び軽油等の如
き溶剤の一部を加熱することよって予じめワニスを調製
しておき、次いで三本ロールミルにより公知の有機顔
料、無機顔料等の如き顔料、ワニス、軽油等の如き溶
剤、金属石鹸等の如き乾燥促進剤並びに有孔澱粉等を練
肉することによって製造してもよいし、或は必要に応じ
て予めワニスを調製し、次いで有孔性澱粉をワニスの一
部と混練して澱粉混練物を得た後に、三本ロールミルに
より顔料、澱粉混練物、ワニス、溶剤並びに乾燥促進剤
を練肉することによって製造してもよい。In order to produce the printing inks according to the present invention, any of them may be the same as the prior art. For example, a varnish is prepared in advance by heating a portion of a synthetic resin such as a rosin-modified phenol resin, an alkyd resin, a petroleum resin, a drying oil such as linseed oil and drill oil, and a portion of a solvent such as light oil. Then, it may be manufactured by kneading a known pigment such as an organic pigment or an inorganic pigment, a solvent such as varnish or light oil, a drying accelerator such as a metal soap, and a perforated starch by a three-roll mill. Alternatively, if necessary, a varnish is prepared in advance, and then the porous starch is kneaded with a part of the varnish to obtain a kneaded starch, and thereafter, a pigment, a kneaded starch, a varnish, a solvent and It may be produced by milling a drying accelerator.

【００１５】本発明の印刷インキ用添加剤及び、それを
含む印刷インキ組成物は枚葉オフセット印刷に限らず、
オフ輪、湿し水不要平版、凸版印刷、グラビア印刷、ス
クリーン印刷等に対しても使用できる。The printing ink additive of the present invention and the printing ink composition containing the same are not limited to sheet-fed offset printing.
It can also be used for off-wheel, fountain-free lithographic printing, letterpress printing, gravure printing, screen printing, etc.

【００１６】[0016]

【実施例】以下本発明を実施例により更に具体的に説明
するが、本発明の範囲はこれらの実施例により限定され
るものではない。EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the scope of the present invention is not limited to these examples.

【００１７】ベッカサイト１１２６（大日本インキ化学
工業社製ロジン変性フェノール樹脂）４０重量部、アマ
ニ油３０重量部並びに軽油（日本石油社製）３０重量部
を２００℃で２時間加熱してワニス（Ａ）を調製した。40 parts by weight of Beccasite 1126 (rosin-modified phenolic resin manufactured by Dainippon Ink and Chemicals, Inc.), 30 parts by weight of linseed oil and 30 parts by weight of light oil (manufactured by Nippon Oil Co., Ltd.) were heated at 200 ° C. for 2 hours to prepare a varnish ( A) was prepared.

【００１８】次いで、上記ワニス（Ａ）６０重量部、カ
ーミン６Ｂ（大日本インキ化学工業社製紅顔料）２０重
量部、軽油（日本石油社製）１９．５重量部、乾燥促進
剤（コバルトオクテートとマンガンナフテートを重量比
で１：１８の割合で混合した混合物）０．５重量部並び
に表１に示した添加剤を三本ロールミルにより練肉する
ことによって実施例１、２並びに比較例１〜３の印刷イ
ンキを製造した。Next, 60 parts by weight of the varnish (A), 20 parts by weight of Carmine 6B (red pigment manufactured by Dainippon Ink and Chemicals, Inc.), 19.5 parts by weight of light oil (manufactured by Nippon Oil Co., Ltd.), and a drying accelerator (cobalt octane) Mixture of tate and manganese naphthate at a weight ratio of 1:18) 0.5 parts by weight and the additives shown in Table 1 were milled with a three-roll mill to prepare Examples 1, 2 and Comparative Examples. 1-3 printing inks were produced.

【００１９】[0019]

【表１】 [Table 1]

【００２０】表１の中で用いた符号は以下を示す。 * サンエイ糖化製、有孔コーンスターチ（粒径：
約２μｍ、孔径：約１μｍのものを使用） ** ナショナルスターチアンドケミカル株式会社
製、ドライフロ *** 島田化学製、ミクロパールThe symbols used in Table 1 are as follows. * Sanei Saccharified, perforated corn starch (particle size:
Approximately 2 μm, pore diameter: approximately 1 μm is used.) ** Made by National Starch and Chemical Co., Ltd., dry flow *** Made by Shimada Chemical, Micropearl

【００２１】表１に示された実施例２、比較例３の澱粉
ペーストは、有孔澱粉或いは市販トウモロコシ澱粉；４
０重量部、ワニスＡ；４０重量部、及びアマニ油；２０
重量部を予めよく混合し、三本ロールミルにより練肉し
て得たものである。The starch pastes of Example 2 and Comparative Example 3 shown in Table 1 are perforated starch or commercially available corn starch;
0 parts by weight, varnish A; 40 parts by weight, and linseed oil; 20
It is obtained by mixing parts by weight well in advance, and kneading with a three-roll mill.

【００２２】（澱粉ペーストの安定性）上記の処方で作
成した、有孔澱粉ペースト及び市販トウモロコシ澱粉ペ
ーストを透明ガラス瓶に入れ、その状態を観察したとこ
ろ、表２の結果のようになり、粒子表面から内部に通じ
る孔を多数有する有効澱粉ペーストが長期に渡り、安定
した分散性を有することを確認した。(Stability of Starch Paste) A perforated starch paste and a commercially available corn starch paste prepared according to the above-mentioned formulation were placed in a transparent glass bottle, and the state was observed. It was confirmed that the effective starch paste having a large number of pores leading to the inside had stable dispersibility over a long period of time.

【００２３】[0023]

【表２】 [Table 2]

【００２４】（印刷試験）実施例１、２及び比較例１〜
４で得られた平版印刷用インキを用いローランドＲ−７
０４オフセット印刷機で、１０，０００枚／時の印刷速
度にてＳＫコート紙に印刷した。(Printing Test) Examples 1 and 2 and Comparative Examples 1 to
Using the lithographic printing ink obtained in 4 above, Roland R-7
Printing was performed on SK coated paper at a printing speed of 10,000 sheets / hour with a 04 offset printing machine.

【００２５】上記印刷物５，０００枚を印刷した時点
で、印刷物の裏移り状態、印刷機のローラー、版、ブラ
ンケットの状態からインキ残りをそれぞれ目視で判定し
た。結果は、表３に示す通りであった。At the time when 5,000 sheets of the above printed matter were printed, the remaining ink was visually judged from the set-off state of the printed matter, the state of the rollers, the plate, and the blanket of the printing press. The results were as shown in Table 3.

【００２６】[0026]

【表３】 [Table 3]

【００２７】*1）印刷物を光沢計「Macbeth LAB GLOSS
meter 」で測定し、比較例４（添加剤未添加品）と比較
して５ポイント以上低下した場合を不良とした。* 1) Printed material was measured using a gloss meter “Macbeth LAB GLOSS”.
"measurement", and a case where the value decreased by 5 points or more as compared with Comparative Example 4 (an additive-free product) was regarded as defective.

【００２８】[0028]

【発明の効果】本発明は、澱粉粒子に多数の孔をあける
ことでインキ成分である樹脂ワニス及び溶剤が孔に含浸
して、澱粉粒子の分散性が向上し、澱粉粒子が沈降する
ことなく長期に渡って安定した分散状態が得られる。そ
の結果、本発明の有孔澱粉粒子からなる添加剤を含有す
る印刷インキが裏移り防止効果、インキ残り防止効果に
おいて、優れていることが判る。According to the present invention, a large number of holes are formed in a starch particle to impregnate a resin varnish and a solvent, which are ink components, into the hole, thereby improving the dispersibility of the starch particle and preventing the starch particle from settling. A stable dispersion state can be obtained over a long period. As a result, it can be seen that the printing ink containing the additive composed of perforated starch particles of the present invention is excellent in the effect of preventing set-off and the effect of remaining ink.

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】 粒子表面から内部に通じる孔を多数有す
る有孔性澱粉からなることを特徴とする印刷インキ用添
加剤。1. A printing ink additive comprising a porous starch having a large number of pores communicating from the particle surface to the inside. 【請求項２】 有孔性澱粉粒子が分解酵素により処理し
て有孔である澱粉粒子である請求項１記載の印刷インキ
用添加剤。2. The printing ink additive according to claim 1, wherein the porous starch particles are treated with a decomposing enzyme to be porous. 【請求項３】 有孔性澱粉粒子の平均粒径が、０．５〜
３０μｍで、孔径が０．１〜１０μｍある請求項１又は
請求項２記載の印刷インキ用添加剤。3. The porous starch particles have an average particle size of 0.5 to 0.5.
The printing ink additive according to claim 1 or 2, wherein the additive has a pore size of 0.1 to 10 µm at 30 µm. 【請求項４】 請求項１〜請求項３に記載の印刷インキ
用添加剤を含有することを特徴とする印刷インキ組成
物。4. A printing ink composition comprising the printing ink additive according to claim 1. 【請求項５】 印刷インキ用添加剤の含有量が０．１〜
１０重量％である請求項４記載の印刷インキ組成物。5. The content of the printing ink additive is 0.1 to 0.1.
The printing ink composition according to claim 4, which is 10% by weight.