JP2004010725A - Detergent for printing - Google Patents

Detergent for printing Download PDF

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Publication number
JP2004010725A
JP2004010725A JP2002164707A JP2002164707A JP2004010725A JP 2004010725 A JP2004010725 A JP 2004010725A JP 2002164707 A JP2002164707 A JP 2002164707A JP 2002164707 A JP2002164707 A JP 2002164707A JP 2004010725 A JP2004010725 A JP 2004010725A
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Japan
Prior art keywords
acid
printing
carbonate
aliphatic carboxylic
weight
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Granted
Application number
JP2002164707A
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Japanese (ja)
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JP4199483B2 (en
Inventor
Tsurumatsu Takano
高野 鶴松
Masanori Onodera
小野寺 正典
Takeshi Katagiri
片桐 武司
Kichiji Ogawa
小川 吉治
Yoshihiro Endo
遠藤 良裕
Satoru Nakamura
中村 哲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DAISHIN KAGAKU KK
Kinyosha Co Ltd
Original Assignee
DAISHIN KAGAKU KK
Kinyosha Co Ltd
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Priority to JP2002164707A priority Critical patent/JP4199483B2/en
Publication of JP2004010725A publication Critical patent/JP2004010725A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a detergent for printing, not only simultaneously removing ink and an attached material such as calcium carbonate of an additive to paper, but also having low toxicity and reducing the pollution of the environment. <P>SOLUTION: The detergent for printing contains an aliphatic carboxylic acid and a carbonic acid ester, and preferably contains an alcoholic organic solvent and a glycolic organic solvent besides the aliphatic carboxylic acid and the carbonic acid ester. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は印刷用洗浄剤に関し、特に印刷用ゴムブランケット及び印刷用ゴムロールにおいて使用される印刷用洗浄剤に関する。
【0002】
【従来の技術】
周知の如く、印刷機では、停止時に洗浄剤によりインキ汚れを洗浄、除去する必要がある。しかし、印刷用ブランケットや印刷用ゴムロールにおいては、紙粉、紙の添加剤である炭酸カルシウム等の付着物質が問題となっており、洗浄剤はインキのみならずこれらの付着物質を同時に除去できる必要がある。
【0003】
ところで、従来の洗浄剤としては、ガソリン、ミネラルスピリット、灯油等の炭化水素油、ジクロルメタン、トリクロロエチレン等の塩素系溶剤が使用されていた。
【0004】
【発明が解決しようとする課題】
しかし、灯油等の炭化水素油は、紙粉汚れに対する除去効果が悪いという問題点があった。また、塩素系溶剤は洗浄効果を有するものの、近年、環境汚染の問題があり、洗浄溶剤として使用することが問題になってきた。
【0005】
本発明は上記事情を考慮してなされたもので、脂肪族カルボン酸と炭酸エステルを含有した構成とすることにより、インキのみならず紙の添加剤である炭酸カルシウム等の付着物質を同時に除去できるとともに、毒性が低く、環境汚染性が極めて低い印刷用洗浄剤を提供することを目的とする。
【0006】
【課題を解決するための手段】
本発明に係る印刷用洗浄剤は、脂肪族カルボン酸と炭酸エステルを含有してなることを特徴とする。
また、本発明に係る印刷用洗浄剤は、前記脂肪族カルボン酸、炭酸エステルの他、アルコール系有機溶剤とグリコール系有機溶剤を含有してなることを特徴とする。
【0007】
更に、本発明に係る印刷用洗浄剤は、脂肪族カルボン酸0.5〜10重量%と炭酸エステル5〜40重量%を含有してなることを特徴とする。
【0008】
【発明の実施の形態】
以下、本発明の印刷用洗浄剤について更に詳しく説明する。
本発明は、脂肪族カルボン酸と炭酸エステルを含有することを特徴とするが、好ましくは両者の配合割合を脂肪族カルボン酸0.5〜10重量%、炭酸エステル5〜40重量%とし、更に好ましくは脂肪族カルボン酸0.5〜1重量%、炭酸エステル10〜30重量%とする。
【0009】
脂肪族カルボン酸の配合割合を上記のように規定したのは、脂肪族カルボン酸が0.5重量%未満ではインキや付着物質特に紙の添加剤である炭酸カルシウムを十分に洗浄できず、10重量%を超えると酸が多すぎて乾燥が悪くなり、かつ洗浄性も悪くなるからである。
【0010】
また、炭酸エステルが5重量%未満ではインキや付着物質特に紙粉を十分に洗浄できず、40重量%を越えると印刷用ゴムブランケット、ゴムロールの膨潤、乾燥後の収縮が大きくなってしまうからである。
【0011】
本発明において、上記脂肪族カルボン酸としては、ギ酸、酢酸、メルカプト酸、ピルピン酸、グリコール酸、シュウ酸、アジピン酸、プロピオン酸、酪酸、イソ酪酸、吉草酸、イソ吉草酸、クロトン酸、乳酸、クロロ酢酸、ジクロロ酢酸、トリクロロ酢酸、トリメチル酢酸、メトキシ酢酸、クエン酸、コハク酸のうち任意の1つ、あるいは2つ以上の組み合わせが挙げられる。このうち、ピルビン酸、グリコール酸、及び両者の組み合わせは臭気が少ない点で好ましい。また、ピルビン酸を炭酸エステルと組み合わせると、特に紙の添加剤である炭酸カルシウムの洗浄性が優れているため、好ましい。
【0012】
本発明において、上記炭酸エステルとしては、炭酸ジメチル、炭酸ジエチルのいずれか、あるいは両者の組み合わせが考えられる。このうち、炭酸ジメチルが好ましい。この理由は、低沸点(沸点:90℃)であり乾燥性が良好で、除去作業が容易になるからである。通常、低沸点の有機溶剤は、引火点もそれなりに低い物となってしまうが、炭酸ジメチルは引火点が高めである(引火点:17℃)。また、インキに対する溶解性も充分である。
【0013】
本発明によれば、印刷用洗浄剤に脂肪族カルボン酸と炭酸エステルを含有しているので、インキに加え、紙粉、紙の添加剤である炭酸カルシウム等の付着物質を同時に洗浄でき、かつ、毒性が低く、環境汚染性を抑制できるという利点を有する。なお、脂肪族カルボン酸の代替えとして、脂肪族炭化水素例えばイソオクタンと炭酸エステルとを組み合わせることが考えられるが、紙粉、紙の添加剤である炭酸カルシウム等の付着に関する洗浄性が悪い。また、イソオクタンは、各都道府県条例による使用禁止あるいは削減対象物質として挙げられているので,環境汚染の問題が解決できない。
【0014】
本発明において、前記脂肪族カルボン酸、炭酸エステルの他、アルコール系有機溶剤とグリコール系有機溶剤を含有することができる。ここで、アルコール系有機溶剤としては、例えばメタノール、エタノール、イソプロピルアルコール、イソブチルアルコール、n−ブチルアルコール、n−プロピルアルコール、sec−ブチルアルコール、tert−ブチルアルコールが挙げられる。
【0015】
前記グリコール系有機溶剤としては、例えば1,3ジオキソラン、テトラヒドロフラン、エチレングリコールモノエチルエーテル、エチレングリコールモノブチルエーテル、メチルメトキシブタノール、エチレングリコールモノイソプロピルエーテル、エチレングリコールモノイソブチルエーテル、エチレングリコールモノt−ブチルエーテル、プロピレングリコールモノメチルエーテル、プロピレングリコールモノプロピルエーテル、エチレングリコールモノプロピルエーテル、ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル、ジエチレングリコールモノブチルエーテル、ジプロピレングリコールモノメチルエーテルが挙げられる。
【0016】
【実施例】
以下、本発明の各実施例及び比較例に係る印刷用洗浄剤について説明する。
(実施例1)
本実施例1では、下記表1に示すように、炭酸ジメチル30重量%、ピルビン酸2重量%、プロピレングリコールモノメチルエーテル30重量%及びn−プロピルアルコール38重量%を配合して印刷用洗浄剤を製造した。
【0017】
事実、実機印刷を行い、印刷後にゴムブランケット表面に付着したインキ及び紙粉、その他布に含ませた実施例1の印刷用洗浄剤にて拭き取り、その効果(インキ洗浄性、紙粉除去、炭酸カルシウム除去、都道府県条例等による使用可否)を調べたところ、下記表2に結果が得られた。表2より、実施例1の印刷用洗浄剤によれば、いずれの試験項目についても良好な結果が得られることが確認できた。
【0018】
【表1】

Figure 2004010725
【0019】
【表2】
Figure 2004010725
【0020】
(比較例1)
比較例1では、上記表1に示すような配合割合、即ちプロピレングリコールモノメチルエーテル40重量%、及び1,1’−ジクロロ−1−フルオロエタン60重量%を配合して印刷用洗浄剤を製造した。
【0021】
比較例1による印刷用洗浄剤の場合も、実施例1と同様、インキ洗浄性、紙粉除去、炭酸カルシウム除去、都道府県条例等による使用可否を調べたところ、上記表2に示す結果が得られた。表2より、比較例1の場合、インキ洗浄性に優れるが、紙粉除去、炭酸カルシウム除去、都道府県条例等による使用可否のいずれの項目についても良好な結果が得られなかった。
【0022】
(比較例2)
比較例2では、上記表1のような配合割合、ピルビン酸2重量%、プロピレングリコールモノメチルエーテル30重量%、n−プロピルアルコール38重量%、及びイソオクタン30重量%を配合して印刷用洗浄剤を製造した。
【0023】
比較例2による印刷用洗浄剤の場合も、実施例1と同様、インキ洗浄性、紙粉除去、炭酸カルシウム除去、都道府県条例等による使用可否を調べたところ、上記表2に示す結果が得られた。表2より、比較例2の場合も、インキ洗浄性に優れるが、紙粉除去、炭酸カルシウム除去、都道府県条例等による使用可否のいずれの項目についても良好な結果が得られなかった。
【0024】
(実施例2〜6)
実施例2〜6では、実施例1で用いた炭酸ジメチル、ピルビン酸、プロピレングリコールモノメチルエーテル及びn−プロピルアルコールの配合割合を下記表3に示すように夫々変えて各種の印刷用洗浄剤を製造した。
【0025】
実施例2〜6による印刷用洗浄剤について、夫々インキ洗浄性、紙粉除去、炭酸カルシウム除去、乾燥性、ゴムの膨潤について調べたところ、下記表5に結果が得られた。表5より、何れの実施例2〜6の場合も良好な結果が得られ、特に実施例1については最良の結果が得られた。
【0026】
(比較例3〜8)
比較例3〜8では、炭酸ジメチル、ピルビン酸、プロピレングリコールモノメチルエーテル及びn−プロピルアルコールの配合割合を下記表4に示すように、変えて印刷用洗浄剤を製造した。
【0027】
比較例3〜8による印刷用洗浄剤の場合についても、インキ洗浄性、紙粉除去、炭酸カルシウム除去、乾燥性、ゴムの膨潤について調べたところ、下記表6に結果が得られた。表6より、いずれの比較例3〜8の場合も、インキ洗浄性、紙粉除去、炭酸カルシウム除去、乾燥性、ゴムの膨潤の全てを満足するものはなく、紙粉除去、炭酸カルシウム除去、乾燥性、ゴムの膨潤の少なくともいずれかで満足な結果が得られなかった。
【0028】
【表3】
Figure 2004010725
【0029】
【表4】
Figure 2004010725
【0030】
【表5】
Figure 2004010725
【0031】
【表6】
Figure 2004010725
【0032】
以上より、実施例のように炭酸ジメチル、ピルビン酸、プロピレングリコールモノメチルエーテル及びn−プロピルアルコールを含む印刷用洗浄剤、特に炭酸ジメチル5〜40重量%、ピルビン酸0.5〜10重量%である印刷用洗浄剤は優れた特性を有することが確認できた。
【0033】
【発明の効果】
以上詳述した如く本発明によれば、脂肪族カルボン酸と炭酸エステルを含有した構成とすることにより、インキのみならず紙の添加剤である炭酸カルシウム等の付着物質を同時に除去できるとともに、毒性が低く、環境汚染性が極めて低い印刷用洗浄剤を提供できる。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a printing detergent, and more particularly to a printing detergent used in a printing rubber blanket and a printing rubber roll.
[0002]
[Prior art]
As is well known, in a printing machine, it is necessary to wash and remove ink stains with a cleaning agent when the printing machine is stopped. However, in printing blankets and printing rubber rolls, adhering substances such as paper powder and calcium carbonate, which is an additive for paper, are problematic, and a cleaning agent must be able to remove not only ink but also these adhering substances at the same time. There is.
[0003]
By the way, as a conventional cleaning agent, gasoline, mineral spirits, hydrocarbon oils such as kerosene, and chlorinated solvents such as dichloromethane and trichloroethylene have been used.
[0004]
[Problems to be solved by the invention]
However, hydrocarbon oils such as kerosene have a problem that the effect of removing paper dust is poor. In addition, although chlorine-based solvents have a cleaning effect, there has been a problem of environmental pollution in recent years, and it has become a problem to use them as cleaning solvents.
[0005]
The present invention has been made in view of the above circumstances, and by adopting a structure containing an aliphatic carboxylic acid and a carbonate, it is possible to simultaneously remove not only ink but also adhering substances such as calcium carbonate which is an additive of paper. In addition, an object of the present invention is to provide a printing detergent having low toxicity and extremely low environmental pollution.
[0006]
[Means for Solving the Problems]
The cleaning agent for printing according to the present invention is characterized by containing an aliphatic carboxylic acid and a carbonate.
Further, the cleaning agent for printing according to the present invention is characterized by containing an alcohol-based organic solvent and a glycol-based organic solvent in addition to the aliphatic carboxylic acid and the carbonate.
[0007]
Further, the cleaning agent for printing according to the present invention is characterized by containing 0.5 to 10% by weight of an aliphatic carboxylic acid and 5 to 40% by weight of a carbonate ester.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the cleaning agent for printing of the present invention will be described in more detail.
The present invention is characterized by containing an aliphatic carboxylic acid and a carbonic acid ester. Preferably, the mixing ratio of both is 0.5 to 10% by weight of the aliphatic carboxylic acid and 5 to 40% by weight of the carbonic acid ester. Preferably, the content is 0.5 to 1% by weight of an aliphatic carboxylic acid and 10 to 30% by weight of a carbonate ester.
[0009]
The reason that the mixing ratio of the aliphatic carboxylic acid is specified as described above is that if the amount of the aliphatic carboxylic acid is less than 0.5% by weight, the ink or the adhering substance, particularly calcium carbonate, which is an additive for paper, cannot be sufficiently washed out. If the content is more than the weight%, the amount of the acid is too large, so that the drying is deteriorated and the cleaning property is also deteriorated.
[0010]
If the content of the carbonate is less than 5% by weight, the ink and the attached substance, especially paper powder, cannot be sufficiently washed, and if the content exceeds 40% by weight, the swelling and shrinkage of the printing rubber blanket and rubber roll after drying become large. is there.
[0011]
In the present invention, as the aliphatic carboxylic acid, formic acid, acetic acid, mercapto acid, pyruvic acid, glycolic acid, oxalic acid, adipic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, isovaleric acid, crotonic acid, lactic acid , Chloroacetic acid, dichloroacetic acid, trichloroacetic acid, trimethylacetic acid, methoxyacetic acid, citric acid, and succinic acid. Of these, pyruvic acid, glycolic acid, and a combination of both are preferred because they have low odor. In addition, it is preferable to combine pyruvic acid with a carbonate ester since calcium carbonate, which is an additive for paper, is particularly excellent in detergency.
[0012]
In the present invention, the carbonate ester may be dimethyl carbonate or diethyl carbonate, or a combination of both. Of these, dimethyl carbonate is preferred. The reason is that it has a low boiling point (boiling point: 90 ° C.), good drying properties, and facilitates the removal operation. Normally, the organic solvent having a low boiling point has a low flash point, but dimethyl carbonate has a high flash point (flash point: 17 ° C.). Further, the solubility in ink is sufficient.
[0013]
According to the present invention, since the printing detergent contains an aliphatic carboxylic acid and a carbonate, in addition to the ink, paper powder, it is possible to simultaneously wash attached substances such as calcium carbonate as an additive of paper, and It has the advantage of low toxicity and low environmental pollution. As a substitute for the aliphatic carboxylic acid, it is conceivable to combine an aliphatic hydrocarbon such as isooctane with a carbonate ester. However, the washing property with respect to adhesion of paper powder, calcium carbonate as an additive of paper, and the like is poor. In addition, isooctane is listed as a substance to be banned or reduced by prefectural ordinances, so that the problem of environmental pollution cannot be solved.
[0014]
In the present invention, an alcohol-based organic solvent and a glycol-based organic solvent can be contained in addition to the aliphatic carboxylic acid and the carbonate. Here, examples of the alcohol-based organic solvent include methanol, ethanol, isopropyl alcohol, isobutyl alcohol, n-butyl alcohol, n-propyl alcohol, sec-butyl alcohol, and tert-butyl alcohol.
[0015]
Examples of the glycol-based organic solvent include 1,3 dioxolane, tetrahydrofuran, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, methyl methoxybutanol, ethylene glycol monoisopropyl ether, ethylene glycol monoisobutyl ether, ethylene glycol mono t-butyl ether, Examples include propylene glycol monomethyl ether, propylene glycol monopropyl ether, ethylene glycol monopropyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, and dipropylene glycol monomethyl ether.
[0016]
【Example】
Hereinafter, the cleaning agents for printing according to Examples and Comparative Examples of the present invention will be described.
(Example 1)
In Example 1, as shown in Table 1 below, 30% by weight of dimethyl carbonate, 2% by weight of pyruvic acid, 30% by weight of propylene glycol monomethyl ether and 38% by weight of n-propyl alcohol were mixed to prepare a printing detergent. Manufactured.
[0017]
In fact, printing was performed on an actual machine, and the ink and paper powder attached to the rubber blanket surface after printing were wiped off with the cleaning agent of Example 1 contained in the cloth, and the effects (ink cleaning, paper powder removal, carbon dioxide removal, etc.) were obtained. When calcium removal and use under the prefectural regulations were examined, the results were obtained in Table 2 below. From Table 2, it was confirmed that according to the cleaning agent for printing of Example 1, good results were obtained for all the test items.
[0018]
[Table 1]
Figure 2004010725
[0019]
[Table 2]
Figure 2004010725
[0020]
(Comparative Example 1)
In Comparative Example 1, a mixing ratio as shown in Table 1 above, that is, 40% by weight of propylene glycol monomethyl ether and 60% by weight of 1,1′-dichloro-1-fluoroethane were mixed to produce a printing detergent. .
[0021]
In the case of the printing detergent according to Comparative Example 1, as in Example 1, ink washability, paper dust removal, calcium carbonate removal, and useability according to prefectural regulations were examined. The results shown in Table 2 above were obtained. Was done. From Table 2, it can be seen that Comparative Example 1 was excellent in ink washability, but did not provide good results in any of the items such as paper powder removal, calcium carbonate removal, and useability according to prefectural regulations.
[0022]
(Comparative Example 2)
In Comparative Example 2, a printing detergent was prepared by blending the blending ratio as shown in Table 1 above, 2% by weight of pyruvic acid, 30% by weight of propylene glycol monomethyl ether, 38% by weight of n-propyl alcohol, and 30% by weight of isooctane. Manufactured.
[0023]
In the case of the cleaning agent for printing according to Comparative Example 2, as in Example 1, the ink washability, paper dust removal, calcium carbonate removal, and useability according to prefectural regulations were examined. The results shown in Table 2 above were obtained. Was done. As can be seen from Table 2, Comparative Example 2 was also excellent in ink washability, but did not provide good results in any of the items such as paper powder removal, calcium carbonate removal, and useability according to prefectural regulations.
[0024]
(Examples 2 to 6)
In Examples 2 to 6, various printing detergents were manufactured by changing the mixing ratio of dimethyl carbonate, pyruvic acid, propylene glycol monomethyl ether and n-propyl alcohol used in Example 1 as shown in Table 3 below. did.
[0025]
The cleaning agents for printing according to Examples 2 to 6 were examined for ink washability, paper powder removal, calcium carbonate removal, drying properties, and rubber swelling. The results are shown in Table 5 below. As shown in Table 5, good results were obtained in each of Examples 2 to 6, and particularly, the best result was obtained in Example 1.
[0026]
(Comparative Examples 3 to 8)
In Comparative Examples 3 to 8, printing detergents were manufactured by changing the mixing ratio of dimethyl carbonate, pyruvic acid, propylene glycol monomethyl ether and n-propyl alcohol as shown in Table 4 below.
[0027]
Also in the case of the cleaning agents for printing according to Comparative Examples 3 to 8, the ink cleaning properties, paper powder removal, calcium carbonate removal, drying properties, and rubber swelling were examined. The results are shown in Table 6 below. From Table 6, none of Comparative Examples 3 to 8 satisfy ink washability, paper dust removal, calcium carbonate removal, drying property, and rubber swelling. Satisfactory results were not obtained in at least one of drying property and rubber swelling.
[0028]
[Table 3]
Figure 2004010725
[0029]
[Table 4]
Figure 2004010725
[0030]
[Table 5]
Figure 2004010725
[0031]
[Table 6]
Figure 2004010725
[0032]
As described above, as in the examples, the printing detergent containing dimethyl carbonate, pyruvic acid, propylene glycol monomethyl ether and n-propyl alcohol, particularly 5 to 40% by weight of dimethyl carbonate and 0.5 to 10% by weight of pyruvic acid. It was confirmed that the cleaning agent for printing had excellent characteristics.
[0033]
【The invention's effect】
As described in detail above, according to the present invention, by adopting a configuration containing an aliphatic carboxylic acid and a carbonate, not only ink but also adhering substances such as calcium carbonate which is an additive of paper can be removed at the same time, and toxicity can be reduced. And a printing detergent having low environmental pollution and extremely low environmental pollution.

Claims (5)

脂肪族カルボン酸と炭酸エステルを含有してなることを特徴とする印刷用洗浄剤。A cleaning agent for printing, comprising an aliphatic carboxylic acid and a carbonate. 前記脂肪族カルボン酸、炭酸エステルの他、アルコール系有機溶剤とグリコール系有機溶剤を含有してなることを特徴とする請求項1記載の印刷用洗浄剤。The cleaning agent for printing according to claim 1, further comprising an alcohol-based organic solvent and a glycol-based organic solvent in addition to the aliphatic carboxylic acid and the carbonate. 脂肪族カルボン酸0.5〜10重量%と炭酸エステル5〜40重量%を含有してなることを特徴とする請求項1若しくは請求項2いずれか1項記載の印刷用洗浄剤。3. The cleaning agent for printing according to claim 1, comprising 0.5 to 10% by weight of an aliphatic carboxylic acid and 5 to 40% by weight of a carbonate ester. 前記脂肪族カルボン酸は、ギ酸、酢酸、メルカプト酸、ピルピン酸、グリコール酸、シュウ酸、アジピン酸、プロピオン酸、酪酸、イソ酪酸、吉草酸、イソ吉草酸、クロトン酸、乳酸、クロロ酢酸、ジクロロ酢酸、トリクロロ酢酸、トリメチル酢酸、メトキシ酢酸、クエン酸、コハク酸のうち少なくとも一つであることを特徴とする請求項1乃至請求項3いずれか1項記載の印刷用洗浄剤。The aliphatic carboxylic acids include formic acid, acetic acid, mercapto acid, pyruvic acid, glycolic acid, oxalic acid, adipic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, isovaleric acid, crotonic acid, lactic acid, chloroacetic acid, and dichloroacetic acid. The printing detergent according to any one of claims 1 to 3, wherein the detergent is at least one of acetic acid, trichloroacetic acid, trimethylacetic acid, methoxyacetic acid, citric acid, and succinic acid. 炭酸エステルは、炭酸ジメチル、炭酸ジエチルの少なくともいずれか一つであることを特徴とする請求項1若しくは請求項2いずれか1項記載の印刷用洗浄剤。3. The cleaning agent for printing according to claim 1, wherein the carbonate ester is at least one of dimethyl carbonate and diethyl carbonate.
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