JP2004216885A - Original plate for lithographic printing - Google Patents

Original plate for lithographic printing Download PDF

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JP2004216885A
JP2004216885A JP2003426364A JP2003426364A JP2004216885A JP 2004216885 A JP2004216885 A JP 2004216885A JP 2003426364 A JP2003426364 A JP 2003426364A JP 2003426364 A JP2003426364 A JP 2003426364A JP 2004216885 A JP2004216885 A JP 2004216885A
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lithographic printing
printing
light
hydrophilic
weight
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Takayuki Sanada
隆幸 真田
Tetsuhiro Koide
哲裕 小出
Yuko Suzuki
祐子 鈴木
Koji Takano
弘二 高野
Masaya Naito
真哉 内藤
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Mitsui Chemicals Inc
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Mitsui Chemicals Inc
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  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Materials For Photolithography (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an original plate for CTP which is sensitized by light in a near infrared region, can be handled in a bright room, does not require developing and wiping operations, and also, is hard to scum even when the amount of wetting water is reduced. <P>SOLUTION: This original plate for lithographic printing which uses the wetting water has a hydrophilic resin photo-sensitive layer. The hydrophilic resin photo-sensitive layer is formed by crosslinking a photo-sensitive resin composition containing (a) a hydrophilic polymer, (b) a crosslinking agent, (c) an optical absorber, and (d) an organic substance of which the hydroxyl value is 500 mg-KOH/g or higher, and also, of which the numeral average molecular weight (Mn) is 3,000 g/mol or lower. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

本発明は平版印刷用の原版、特に湿し水を用いる平版印刷用の原版に関する。   The present invention relates to an original plate for lithographic printing, in particular, an original plate for lithographic printing using a fountain solution.

平版印刷、所謂オフセット印刷は紙への印刷に於いて主流であり、現在広く用いられている。従来このオフセット印刷で用いられる刷版は、印刷原稿を一旦紙等に出力した後、この原稿を写真撮影して版下フィルムを作成し、この版下フィルムを通して感光性の刷版を露光、現像することにより作られていた。   Lithographic printing, so-called offset printing, is the mainstream in printing on paper and is currently widely used. Conventionally, the printing plate used in this offset printing is to print the original on paper and then take a photograph of the original to create an underlay film, and expose and develop a photosensitive plate through this underlay film. It was made by doing.

しかし、近年情報のデジタル化とレーザーの高出力化により刷版の作成に於いて、上記した版下フィルムを使用せずに、レーザーを走査して直接刷版に描画して版を作成する方法、所謂CTP(Computer To Plate)法が実用に供されている。   However, in recent years, in the preparation of printing plates by digitizing information and increasing the output of lasers, a method of creating a plate by directly scanning a laser and drawing directly on a printing plate without using the underlay film described above. The so-called CTP (Computer To Plate) method has been put to practical use.

現在実用化されているCTP用の原版としては、波長500nm前後の可視光による光反応を利用したフォトポリマー型の刷版があるが、この版は勿論現像を必要とするだけでなく、解像度が劣り、又明室での取り扱いができないという問題点がある。   As an original plate for CTP currently in practical use, there is a photopolymer type printing plate utilizing a photoreaction by visible light having a wavelength of about 500 nm. However, this plate not only requires development but also has a high resolution. It is inferior and cannot be handled in a light room.

そして、このような問題点を改良するために、特許文献1には、近赤外線領域の光による熱反応を利用した平版印刷用の原版が開示され、該版は既に市場に供されている。この版は明室で取り扱うことができ、且つ解像度も優れるが、依然として現像処理が必要なものである。   In order to improve such a problem, Patent Literature 1 discloses a lithographic printing original plate utilizing a thermal reaction caused by light in a near-infrared region, and the original plate is already on the market. This plate can be handled in a bright room and has excellent resolution, but still requires development processing.

そこで、湿式現像処理の不要な平版印刷用の原版として、特許文献2には、露光領域で自己分散性樹脂粒子が溶融・融着して画像を形成する原版が開示されている。この原版は感光層の非画線部が湿し水で除去が可能な原版であり、いわゆる印刷機上の現像ができ、専用の現像機を必要とはしないものである。しかし、印刷機上で現像した場合、湿し水やインクを汚染するだけでなく、保存時の湿度管理に厳しさが要求されるという欠点を有する。   Thus, as an original plate for lithographic printing that does not require wet development, Patent Document 2 discloses an original plate in which self-dispersible resin particles are melted and fused in an exposed area to form an image. This original plate is an original plate in which the non-image area of the photosensitive layer can be removed with dampening solution, and can be developed on a so-called printing machine, and does not require a dedicated developing machine. However, when developed on a printing machine, it has the drawbacks that not only does fountain solution and ink become contaminated, but strictness is required for humidity control during storage.

また、特許文献3には、感光層の親水性層に水溶性化合物が含まれることを特徴とする原版が記載されているが、これは露光領域で光熱変換層と親水性層間の密着性が低下し、親水性層が印刷機上で容易に除去する原版であり、いわゆるアブレーション技術を利用したものである。この原版は、印刷前あるいは印刷中に疎水性有機物に汚染されても容易に除去することができるものである。しかし、該特許も印刷機上で現像した場合、除去された親水性層が湿し水やインクを汚染するという欠点を有するものである。   Patent Document 3 discloses an original plate characterized in that a water-soluble compound is contained in a hydrophilic layer of a photosensitive layer. This is an original plate that is lowered and the hydrophilic layer is easily removed on a printing press, and utilizes a so-called ablation technique. This original plate can be easily removed even if it is contaminated with a hydrophobic organic substance before or during printing. However, this patent also has the disadvantage that when developed on a printing press, the removed hydrophilic layer contaminates the fountain solution and ink.

一方、湿式現像も印刷機上現像も必要としない平版印刷用の原版として、特許文献4には、独立し、且つ接触関係にある疎水性熱可塑性樹脂微粒子を含有する親水性樹脂層を有し、熱により疎水性熱可塑性樹脂微粒子が融着し親水性が変化する原版が開示されている。しかし、この原版は特に光照射で描画した際は感度が低く、且つ親水性樹脂層は強度が弱く耐刷性に劣る。又、着インク性を改善するために疎水性熱可塑性樹脂の量を増やすと地汚れしてしまうという欠点を有するものであった。   On the other hand, as an original plate for lithographic printing that does not require wet development or on-press development, Patent Document 4 has a hydrophilic resin layer containing hydrophobic thermoplastic resin fine particles that are independent and in contact with each other. An original plate in which hydrophobic thermoplastic resin particles are fused by heat to change hydrophilicity is disclosed. However, this original plate has low sensitivity especially when drawing by light irradiation, and the hydrophilic resin layer has low strength and poor printing durability. Further, when the amount of the hydrophobic thermoplastic resin is increased in order to improve the ink-attaching property, there is a disadvantage that the background is stained.

更に、特許文献5には、親水性樹脂中に該親水性樹脂中の親水基と反応する親油性物質を含むマイクロカプセルを含有した感光層からなる原版であって、光の照射によりマイクロカプセルを破壊して親水性樹脂を親油化する技術が開示されている。しかしこの方法は解像度を上げたり、地汚れを防止するにはマイクロカプセルの粒径を非常に小さくしなければならず、製造が困難なであるという問題点を有している。   Further, Patent Document 5 discloses an original plate comprising a photosensitive layer containing a microcapsule containing a lipophilic substance which reacts with a hydrophilic group in the hydrophilic resin in a hydrophilic resin, and the microcapsule is irradiated by light. There is disclosed a technique for breaking down a hydrophilic resin to make it lipophilic. However, this method has a problem that the particle size of the microcapsules must be made very small in order to increase the resolution and prevent background contamination, which makes production difficult.

そこで本出願人は、親水性ポリマー、架橋剤及び光吸収剤からなる感光性樹脂組成物、あるいは親水性ポリマー、架橋剤、光吸収剤及び疎水性ポリマーからなる感光性樹脂組成物を架橋した親水性樹脂感光層からなり、光の照射により表面が親水性から親インク性に変化する平版印刷用の原版を特許文献6により報告した。この原版は現像や拭き取り操作が不要で、且つ光照射部の表面だけが変化するため、感度、解像度に優れているものであるが、この版のさらなる性能向上のために、親水部の保水性を向上させることが望まれていた。   Accordingly, the present applicant has proposed a hydrophilic resin obtained by crosslinking a photosensitive resin composition comprising a hydrophilic polymer, a crosslinking agent and a light absorbing agent, or a photosensitive resin composition comprising a hydrophilic polymer, a crosslinking agent, a light absorbing agent and a hydrophobic polymer. A lithographic printing original plate composed of a photosensitive resin photosensitive layer and whose surface changes from hydrophilic to ink-philic by light irradiation was reported in Patent Document 6. This master plate is excellent in sensitivity and resolution because it does not require development and wiping operations, and only the surface of the light irradiation part changes, but in order to further improve the performance of this plate, the water retention of the hydrophilic part It was desired to improve the.

平版印刷版の親水部の保水性を向上させる公知の方法としては、例えば特許文献7に、1分子中にオキシエチレン単位とオキシプロピレン単位の両方を含む低分子量ポリエーテル系化合物を含む画像受理層を設けた原版が開示されている。しかしこの方法では、湿し水への溶出が大きく、印刷中に保水性が低下してしまう、即ち保水性の持続性に欠けるという問題点を有するものであった。   As a known method for improving the water retention of the hydrophilic portion of a lithographic printing plate, for example, Patent Document 7 discloses an image receiving layer containing a low-molecular-weight polyether-based compound containing both oxyethylene units and oxypropylene units in one molecule. Is disclosed. However, this method has a problem that the elution into the fountain solution is large and the water retention is reduced during printing, that is, the water retention is not sustained.

また、平版印刷版の親水部の保水性を向上させる別の方法として、例えば特許文献8には、ポリビニルアルコールなど水酸基を多く含む親水性樹脂を架橋した感熱性平版印刷版材料が開示されている。しかし、この方法ではポリビニルアルコールなど水酸基を多く含む親水性樹脂を用いて架橋した場合、表面に出る水酸基が少なくなるため親水性が十分でなく、地汚れを起こしやすいという欠点を有するものであった。
特開平7−20629号公報 特開平9−127683号公報 特開2001−109140号公報 米国特許3476937号明細書 特開平7−1850号公報 国際公開第01/083234号パンフレット 特開平11−42865号公報 特開平11−95417号公報
Further, as another method for improving the water retention of a hydrophilic portion of a lithographic printing plate, for example, Patent Document 8 discloses a heat-sensitive lithographic printing plate material obtained by crosslinking a hydrophilic resin having a large number of hydroxyl groups such as polyvinyl alcohol. . However, in this method, when cross-linking is performed using a hydrophilic resin containing a large number of hydroxyl groups such as polyvinyl alcohol, the number of hydroxyl groups appearing on the surface is reduced, so that the hydrophilicity is not sufficient, and there is a disadvantage that soiling is easily caused. .
JP-A-7-20629 JP-A-9-127683 JP 2001-109140 A U.S. Pat. No. 3,476,937 JP-A-7-1850 International Publication No. 01/083234 pamphlet JP-A-11-42865 JP-A-11-95417

本発明の目的は、近赤外領域の光に感光し、明室で取り扱うことができ、更には現像や拭き取り操作が不要で、且つ湿し水の量を減らしても地汚れし難いCTP用の原版を提供することである。   An object of the present invention is for a CTP which is sensitive to light in the near-infrared region, can be handled in a bright room, further requires no development or wiping operation, and hardly soils even if the amount of dampening water is reduced. Is to provide an original version of

本発明者らは鋭意検討した結果、水酸基価500mg−KOH/g以上であり且つ数平均分子量(Mn)が3000g/mol以下の有機物を添加した感光性樹脂組成物を架橋して親水性樹脂感光層を形成することによって、上記の目的を達成することができることを見出し、本発明に到達した。すなわち、本発明は以下の通りである。   As a result of intensive studies, the present inventors have found that a photosensitive resin composition to which an organic substance having a hydroxyl value of 500 mg-KOH / g or more and a number average molecular weight (Mn) of 3000 g / mol or less has been added to form a hydrophilic resin The present inventors have found that the above objects can be achieved by forming a layer, and have reached the present invention. That is, the present invention is as follows.

(1)湿し水を用いる平版印刷用の原版において、
(a)親水性ポリマー、
(b)架橋剤、
(c)光吸収剤、及び
(e)水酸基価が500mg−KOH/g以上であり且つ数平均分子量(Mn)が3000g/mol以下の有機物
を含有する感光性樹脂組成物を架橋してなる親水性樹脂感光層を有することを特徴とする平版印刷用の原版。
(2)前記感光性樹脂組成物が、さらに(e)親油性ポリマーを含有するものである(1)記載の平版印刷用の原版。
(3)前記親水性樹脂感光層が、光の照射により照射部表面の親水性が親インク性に変化する性質を有するものである(1)又は(2)記載の平版印刷用の原版。
(4)前記(d)水酸基価500mg−KOH/g以上であり且つ数平均分子量(Mn)が3000g/mol以下の有機物が、酸基を有する有機物、多価アルコール類、糖類、およびこれらの置換体から選ばれる少なくとも1種以上の有機物である(1)乃至(3)に記載の平版印刷用の原版。
(5)前記(d)水酸基価が500mg−KOH/g以上であり且つ数平均分子量(Mn)が3000g/mol以下の有機物の添加量が、親水性ポリマー、架橋剤および親油性ポリマーの合計固形分100重量部に対し0.1〜15重量部である(1)乃至(4)に記載の平版印刷用の原版。
(1) In a lithographic printing plate using dampening solution,
(A) a hydrophilic polymer,
(B) a crosslinking agent,
(C) hydrophilicity obtained by cross-linking a photosensitive resin composition containing a light absorber and (e) an organic material having a hydroxyl value of 500 mg-KOH / g or more and a number average molecular weight (Mn) of 3000 g / mol or less. An original plate for lithographic printing, comprising a photosensitive resin photosensitive layer.
(2) The lithographic printing plate precursor according to (1), wherein the photosensitive resin composition further comprises (e) a lipophilic polymer.
(3) The lithographic printing plate precursor according to (1) or (2), wherein the hydrophilic resin photosensitive layer has a property that the hydrophilicity of the surface of the irradiated portion is changed to ink-philicity by light irradiation.
(4) The (d) organic substance having a hydroxyl value of 500 mg-KOH / g or more and a number average molecular weight (Mn) of 3000 g / mol or less is an organic substance having an acid group, a polyhydric alcohol, a saccharide, and substitution thereof. The lithographic printing plate precursor according to any one of (1) to (3), which is at least one or more organic substances selected from a body.
(5) The total solid content of the hydrophilic polymer, the crosslinking agent and the lipophilic polymer is (d) the amount of the organic substance having a hydroxyl value of 500 mg-KOH / g or more and a number average molecular weight (Mn) of 3000 g / mol or less. The lithographic printing plate precursor according to any one of (1) to (4), wherein the lithographic printing plate is 0.1 to 15 parts by weight with respect to 100 parts by weight.

本発明の平版印刷用の原版を用いれば、現像や拭き取り等の工程が不要で、且つ湿し水の量を減らしても地汚れし難いCTP用の原版を提供することができる。   By using the lithographic printing original plate of the present invention, it is possible to provide a CTP original plate that does not require steps such as development and wiping, and is hardly soiled even if the amount of dampening water is reduced.

以下に本発明の平版印刷用の原版について詳細に説明する。まず、本発明の感光性樹脂組成物を架橋してなる親水性樹脂感光層に関して詳しく説明する。本発明の平版印刷用の原版は、湿し水を用いるオフセット印刷用原版であって、好ましくは無現像型として使用される版であり、感光層の光照射部以外は非画像部になるものである。従って、本発明の感光層は親水性で、且つ水に不溶となるものが好ましい。そして、本発明の原版では、光を照射した部分の感光層はアブレーションにより取り除かれることはなく、感光層の親水性が親インク性に変化することがより好ましい。そのため、本発明の原版は光の照射後に現像や拭き取り等が不要となるが、上記したような特性の変化を具現化するために、本発明の感光層は、(a)親水性ポリマー、(b)架橋剤、(c)光吸収剤を含有してなる感光性樹脂組成物、あるいは(a)親水性ポリマー、(b)架橋剤、(e)親油性ポリマー、(c)光吸収剤を含有してなる感光性樹脂組成物を架橋してなるものである。親水性ポリマーは架橋することにより水に不溶性となる。   Hereinafter, the lithographic printing original plate of the present invention will be described in detail. First, the hydrophilic resin photosensitive layer formed by crosslinking the photosensitive resin composition of the present invention will be described in detail. The lithographic printing original plate of the present invention is an offset printing original plate using a fountain solution, and is preferably a plate used as a non-developing type, and becomes a non-image portion except for the light-irradiated portion of the photosensitive layer. It is. Accordingly, the photosensitive layer of the present invention is preferably hydrophilic and insoluble in water. In the original plate of the present invention, it is more preferable that the hydrophilicity of the photosensitive layer is changed to the ink-philic property without removing the photosensitive layer in a portion irradiated with light by ablation. Therefore, the original plate of the present invention does not require development or wiping after irradiation of light. However, in order to realize the above-described change in characteristics, the photosensitive layer of the present invention comprises (a) a hydrophilic polymer, b) a crosslinking agent, (c) a photosensitive resin composition containing a light absorbing agent, or (a) a hydrophilic polymer, (b) a crosslinking agent, (e) a lipophilic polymer, and (c) a light absorbing agent. It is obtained by crosslinking the contained photosensitive resin composition. The hydrophilic polymer becomes insoluble in water by crosslinking.

本発明においては、上記感光性樹脂組成物に、更に(d)水酸基価500mg−KOH/g以上であり且つ数平均分子量(Mn)が3000g/mol以下の有機物を含有することを必須とし、これにより湿し水量を減らしても地汚れし難いという効果が得られるものである。   In the present invention, it is essential that the photosensitive resin composition further contains (d) an organic substance having a hydroxyl value of 500 mg-KOH / g or more and a number average molecular weight (Mn) of 3000 g / mol or less. Therefore, even if the amount of dampening water is reduced, it is possible to obtain an effect that the soil is hardly soiled.

本発明において、(d)水酸基価500mg−KOH/g以上であり且つ数平均分子量(Mn)が3000g/mol以下の有機物とは、好ましくは酸基を有する有機物、多価アルコール類、糖類、およびこれらの置換体から選ばれる少なくとも1種以上の有機物である。これらの具体例としてはタンニン酸、ジメチロールプロピオン酸、ペクチン酸、シキミ酸、没食子酸、カルミン酸等の有機酸およびそのアルカリ金属塩やアミン塩、グリセリン、エリトリトール、マンニトール、イノシトール、グルコース、マンノース、フルクトース、ガラクトース、ラクトース、セロビオース、マルトース等が挙げられ、好ましい例としてタンニン酸、グルコース等が挙げられる。これらの有機物は1種単独使用でも問題なく、また2種以上を混合して用いてもよい。水酸基価はより好ましくは、500mg−KOH/g以上3000mg−KOH/g以下である。更に、数平均分子量Mnは、より好ましくは50g/mol以上2000g/mol以下である。この範囲のものを使用することにより、表面にブリードする有効水酸基が多いため親水性向上効果があり、かつ架橋剤により一部が固定化されるため、湿し水への溶出が少なく、親水性向上効果が持続し、好ましい。   In the present invention, (d) an organic substance having a hydroxyl value of 500 mg-KOH / g or more and a number average molecular weight (Mn) of 3000 g / mol or less preferably means an organic substance having an acid group, a polyhydric alcohol, a saccharide, and It is at least one or more organic substances selected from these substituents. Specific examples of these include tannic acid, dimethylolpropionic acid, pectic acid, shikimic acid, gallic acid, organic acids such as carminic acid and alkali metal salts and amine salts thereof, glycerin, erythritol, mannitol, inositol, glucose, mannose, Examples thereof include fructose, galactose, lactose, cellobiose, and maltose. Preferred examples include tannic acid and glucose. These organic substances may be used alone or in a combination of two or more. The hydroxyl value is more preferably 500 mg-KOH / g or more and 3000 mg-KOH / g or less. Further, the number average molecular weight Mn is more preferably 50 g / mol or more and 2000 g / mol or less. By using one in this range, there are many effective hydroxyl groups that bleed to the surface, which has an effect of improving hydrophilicity, and a part is fixed by a cross-linking agent. The improvement effect lasts and is preferable.

ここで本発明において水酸基価とは、物質1gをアセチル化するとき水酸基と結合した酢酸を中和するのに必要なKOHのmg数の計算値である。分子量分布をもった化合物の数平均分子量値(Mn)はGPC−MALLSの測定により得られ、ポリスチレン換算での値である。   Here, in the present invention, the hydroxyl value is a calculated value of the number of mg of KOH required to neutralize acetic acid bonded to the hydroxyl group when 1 g of a substance is acetylated. The number average molecular weight (Mn) of a compound having a molecular weight distribution is obtained by GPC-MALLS measurement and is a value in terms of polystyrene.

水酸基価500mg−KOH/g以上であり且つ数平均分子量(Mn)が3000g/mol以下の有機物の添加による親水性向上効果発現の理由は明らかではないが、親水性の高い水酸基により保水力が高まるためと考えられる。また、架橋剤との反応により親水性樹脂組成物中に固定化されるため、印刷中に湿し水に溶出することがなく、親水性が低下しないと考えられる。この有機物の添加により、親水性に優れ、PS版並みに湿し水量を減らしても地汚れしない、現像や拭き取り操作が不要のCTP用の版に用いられる印刷用原版が得られる。   Although the reason for the effect of improving the hydrophilicity by adding an organic substance having a hydroxyl value of 500 mg-KOH / g or more and a number average molecular weight (Mn) of 3000 g / mol or less is not clear, the water retention ability is increased by the highly hydrophilic hydroxyl group. It is thought that it is. In addition, since it is immobilized in the hydrophilic resin composition by the reaction with the cross-linking agent, it does not elute into the dampening water during printing, and it is considered that the hydrophilicity does not decrease. By adding this organic substance, a printing master plate which is excellent in hydrophilicity, does not become soiled even when the amount of dampening water is reduced like a PS plate, and does not require development and wiping operations can be obtained.

水酸基価500mg−KOH/g以上であり且つ数平均分子量(Mn)が3000g/mol以下の有機物の添加量は、親水性ポリマー、架橋剤および親油性ポリマーの合計固形分100重量部に対し、0.1〜15重量部であることが好ましく、さらに0.3〜10重量部であることが好ましい。添加量がこの範囲であれば、親水性向上効果が現われ、耐刷性が悪化することがなく好ましい。   The amount of the organic substance having a hydroxyl value of 500 mg-KOH / g or more and a number average molecular weight (Mn) of 3000 g / mol or less is 0 parts by weight based on 100 parts by weight of the total solid content of the hydrophilic polymer, the crosslinking agent, and the lipophilic polymer. 0.1 to 15 parts by weight, more preferably 0.3 to 10 parts by weight. When the amount is within this range, the effect of improving hydrophilicity appears, and the printing durability is not degraded, which is preferable.

本発明の平版印刷用の原版において用いられる感光性樹脂組成物は、前述の水酸基価500mg−KOH/g以上であり且つ数平均分子量(Mn)が3000g/mol以下の有機物の他、親水性ポリマー、架橋剤、光吸収剤を含有するものであり、より好ましくは更に親油性ポリマーを含有するものである。次に感光性樹脂組成物の各成分について説明する。   The photosensitive resin composition used in the lithographic printing plate precursor according to the present invention includes an organic material having a hydroxyl value of 500 mg-KOH / g or more and a number average molecular weight (Mn) of 3000 g / mol or less, and a hydrophilic polymer. , A crosslinking agent and a light absorbing agent, more preferably a lipophilic polymer. Next, each component of the photosensitive resin composition will be described.

本発明の感光性樹脂組成物に含有する(a)親水性ポリマーは、性質として親水性を有するものであれば特に限定されないが、親水性基及び架橋剤と反応する官能基(架橋官能基)を有することが好ましい。親水性ポリマーの親水性基としては、例えば、水酸基、アミド基、アミノ基、スルホンアミド基、オキシメチレン基、オキシエチレン基等、更にカルボキシル基、スルホン酸基、ホスホン酸基等の酸性基やこれら酸性基のアルカリ金属塩やアミン塩等が挙げられる。   The (a) hydrophilic polymer contained in the photosensitive resin composition of the present invention is not particularly limited as long as it has a hydrophilic property, but a hydrophilic group and a functional group that reacts with a crosslinking agent (crosslinking functional group). It is preferable to have Examples of the hydrophilic group of the hydrophilic polymer include, for example, a hydroxyl group, an amide group, an amino group, a sulfonamide group, an oxymethylene group, an oxyethylene group, and an acid group such as a carboxyl group, a sulfonic acid group, and a phosphonic acid group. Examples thereof include alkali metal salts and amine salts of acidic groups.

又架橋官能基としては、水酸基、アミド基、アミノ基、イソシアナート基、グリシジル基、オキサゾリン基、メチロール基、及びメチロール基とメタノールやブタノール等のアルコールとが縮合したメトキシメチル基やブトキシメチル基等、更にカルボキシル基、スルホン酸基、ホスホン酸基等の酸性基やこれら酸性基のアルカリ金属塩やアミン塩等が挙げられる。架橋反応の容易さと未反応時の親水性保持能力から特に水酸基が好ましい。   Examples of the crosslinking functional group include a hydroxyl group, an amide group, an amino group, an isocyanate group, a glycidyl group, an oxazoline group, a methylol group, and a methoxymethyl group and a butoxymethyl group in which a methylol group is condensed with an alcohol such as methanol or butanol. And acidic groups such as a carboxyl group, a sulfonic acid group and a phosphonic acid group, and alkali metal salts and amine salts of these acidic groups. A hydroxyl group is particularly preferred from the viewpoint of ease of crosslinking reaction and ability to retain hydrophilicity when not reacted.

親水性ポリマーのより具体的な例としては、水溶性の以下のポリマーが挙げられる。即ち、セルロース類、ゼラチン、前記した親水性基や架橋官能基を有する不飽和酸及びその誘導体類やN―ビニルアセトアミド、N−ビニルホルムアミド、酢酸ビニル、ビニルエーテル等を重合、共重合してなるポリマー及びこのポリマーの加水分解ポリマー等である。   More specific examples of the hydrophilic polymer include the following water-soluble polymers. That is, polymers obtained by polymerizing and copolymerizing celluloses, gelatin, unsaturated acids having the above-mentioned hydrophilic groups or cross-linking functional groups and derivatives thereof, N-vinylacetamide, N-vinylformamide, vinyl acetate, vinyl ether and the like. And a hydrolyzed polymer of this polymer.

前記した親水性基や架橋官能基を有する不飽和酸及びその誘導体の具体例として、水酸基を有する不飽和酸誘導体としては、ヒドロキシエチル(メタ)アクリレート、ポリエチレングリコールモノ(メタ)アクリレート、ヒドロキシプロピル(メタ)アクリレート、ポリプロピレングリコールモノ(メタ)アクリレート、ヒドロキシブチル(メタ)アクリレート、メチロール(メタ)アクリルアミドや、該メチロール(メタ)アクリルアミドとメチルアルコールやブチルアルコールとの縮合物であるメトキシメチル(メタ)アクリルアミド、ブトキシメチル(メタ)アクリルアミド等が挙げられる。   Specific examples of the unsaturated acid having a hydrophilic group or a cross-linking functional group and derivatives thereof include hydroxyethyl (meth) acrylate, polyethylene glycol mono (meth) acrylate, and hydroxypropyl ( (Meth) acrylate, polypropylene glycol mono (meth) acrylate, hydroxybutyl (meth) acrylate, methylol (meth) acrylamide, and methoxymethyl (meth) acrylamide which is a condensate of the methylol (meth) acrylamide with methyl alcohol or butyl alcohol And butoxymethyl (meth) acrylamide.

アミド基を有する不飽和酸誘導体としては、無置換又は置換(メタ)アクリルアミド、無置換又は置換イタコン酸アミド、無置換又は置換フマル酸アミド、無置換又は置換フタル酸アミド、N―ビニルアセトアミド、N−ビニルホルムアミド等が挙げられる。無置換又は置換(メタ)アクリルアミドのより具体例としては、(メタ)アクリルアミド、N−メチル(メタ)アクリルアミド、N,N−ジメチル(メタ)アクリルアミド、N−エチル(メタ)アクリルアミド、N,N−ジエチル(メタ)アクリルアミド、N,N−ジメチルアミノプロピル(メタ)アクリルアミド、N−イソプロピル(メタ)アクリルアミド、ダイアセトン(メタ)アクリルアミド、メチロール(メタ)アクリルアミド、メトキシメチル(メタ)アクリルアミド、ブトキシメチル(メタ)アクリルアミド、スルホン酸プロピル(メタ)アクリルアミド、(メタ)アクリロイルモルホリン等が挙げられる。前記イタコン酸アミド等の二塩基酸アミドの場合は一方のカルボキシル基がアミド化されたモノアミドであっても良く、両方のカルボキシル基がアミド化されたジアミドであっても良い。更に、グリシジル基を有する不飽和酸誘導体としては、グリシジル(メタ)アクリレート、パラビニルフェニルグリシジルエーテル等が挙げられる。   Examples of the unsaturated acid derivative having an amide group include unsubstituted or substituted (meth) acrylamide, unsubstituted or substituted itaconic amide, unsubstituted or substituted fumaric amide, unsubstituted or substituted phthalamide, N-vinylacetamide, N-vinylacetamide, -Vinylformamide and the like. More specific examples of unsubstituted or substituted (meth) acrylamide include (meth) acrylamide, N-methyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-ethyl (meth) acrylamide, N, N- Diethyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, N-isopropyl (meth) acrylamide, diacetone (meth) acrylamide, methylol (meth) acrylamide, methoxymethyl (meth) acrylamide, butoxymethyl (meth) ) Acrylamide, propyl sulfonate (meth) acrylamide, (meth) acryloylmorpholine and the like. In the case of a dibasic acid amide such as the aforementioned itaconic acid amide, a monoamide in which one carboxyl group is amidated or a diamide in which both carboxyl groups are amidated may be used. Further, examples of the unsaturated acid derivative having a glycidyl group include glycidyl (meth) acrylate, paravinylphenyl glycidyl ether and the like.

カルボキシル基を有する不飽和酸としては、(メタ)アクリル酸等の一塩基不飽和酸、イタコン酸、フマル酸、マレイン酸及びその無水物等の二塩基不飽和酸やこれら二塩基不飽和酸のモノエステル、モノアミド等が挙げられる。   Examples of the unsaturated acid having a carboxyl group include monobasic unsaturated acids such as (meth) acrylic acid, dibasic unsaturated acids such as itaconic acid, fumaric acid, maleic acid and anhydride thereof, and dibasic unsaturated acids such as Monoester, monoamide and the like can be mentioned.

又、スルホン酸基を有する不飽和酸としては、スルホエチル(メタ)アクリレート、(メタ)アクリルアミドメチルプロパンスルホン酸、ビニルスルホン酸、ビニルメチルスルホン酸、イソプロぺニルメチルスルホン酸、(メタ)アクリル酸にエチレンオキシド、又はプロピレンオキシドを付加したアルコールの硫酸エステル、(メタ)アクリロイロキシエチルスルホン酸、モノアルキルスルホコハク酸エステルとアリル基を有する化合物とのエステル、モノアルキルスルホコハク酸エステルとグリシジル(メタ)アクリレートとの反応生成物等が、ホスホン酸基を有する重合性不飽和モノマーとしては、ビニルリン酸、リン酸モノ(2−ヒドロキシエチル)(メタ)アクリレート、リン酸モノアルキルエステルのモノ(2−ヒドロキシエチル)(メタ)アクリレート等が挙げられる。   Examples of the unsaturated acid having a sulfonic acid group include sulfoethyl (meth) acrylate, (meth) acrylamidomethylpropanesulfonic acid, vinylsulfonic acid, vinylmethylsulfonic acid, isopropenylmethylsulfonic acid, and (meth) acrylic acid. Sulfuric acid esters of alcohols to which ethylene oxide or propylene oxide is added, (meth) acryloyloxyethylsulfonic acid, esters of monoalkylsulfosuccinates with compounds having an allyl group, monoalkylsulfosuccinates and glycidyl (meth) acrylate Examples of the polymerizable unsaturated monomer having a phosphonic acid group include vinyl phosphoric acid, mono (2-hydroxyethyl) (meth) acrylate phosphate, and mono (2-hydroxyethyl phosphate) monoalkyl phosphate. ) (Meth) acrylate.

これらのカルボキシル基、スルホン酸基やホスホン酸基はアルカリ金属、アルカリ土類金属やアミン類で中和されていても良い。中和に用いられるアルカリ金属としては、ナトリウム、カリウム、リチウム等が、アルカリ土類金属としては、カルシウム、マグネシウム等が、及びアミン類としては、アンモニア、メチルアミン、ジメチルアミン、トリメチルアミン、エチルアミン、ジエチルアミン、トリエチルアミン、モノエタノールアミン、ジエタノールアミン、トリエタノールアミン等が挙げられる。   These carboxyl groups, sulfonic groups and phosphonic groups may be neutralized with alkali metals, alkaline earth metals or amines. As alkali metals used for neutralization, sodium, potassium, lithium, etc., as alkaline earth metals, calcium, magnesium, etc., and as amines, ammonia, methylamine, dimethylamine, trimethylamine, ethylamine, diethylamine , Triethylamine, monoethanolamine, diethanolamine, triethanolamine and the like.

重合するに際しては、前記した不飽和酸及びその誘導体と共重合可能なモノマーを併用しても良い。共重合可能なモノマーとしては、例えばメチル(メタ)アクリレート、エチル(メタ)アクリレート、ブチル(メタ)アクリレート、2−エチルヘキシル(メタ)アクリレート、グリシジル(メタ)アクリレート、ジメチルアミノエチル(メタ)アクリレート、ジエチルアミノエチル(メタ)アクリレート、フェノキシエチル(メタ)アクリレート、ベンジル(メタ)アクリレート、イソポロニル(メタ)アクリレート、アダマンチル(メタ)アクリレート、シクロヘキシル(メタ)アクリレート、スチレン、α-メチルスチレン、アクリロニトリル、メタクリロニトリル、酢酸ビニル等が挙げられる。尚、前記の記載に於いて、(メタ)アクリルアミドや(メタ)アクリル酸等に於ける(メタ)アクリル、(メタ)アクリロイル、更に(メタ)アクリレート等は、それぞれアクリルまたはメタクリル、アクリロイルまたはメタクリロイル、アクリレートまたはメタクリレートを意味する。   Upon polymerization, a monomer copolymerizable with the above-described unsaturated acid and its derivative may be used in combination. Examples of the copolymerizable monomer include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, glycidyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, and diethylamino. Ethyl (meth) acrylate, phenoxyethyl (meth) acrylate, benzyl (meth) acrylate, isopolonyl (meth) acrylate, adamantyl (meth) acrylate, cyclohexyl (meth) acrylate, styrene, α-methylstyrene, acrylonitrile, methacrylonitrile, Vinyl acetate and the like. In the above description, (meth) acrylamide, (meth) acrylic acid, etc., (meth) acrylic, (meth) acryloyl, and further (meth) acrylate etc. are acryl or methacryl, acryloyl or methacryloyl, respectively. Means acrylate or methacrylate.

本発明の感光性樹脂組成物に含有する(b)架橋剤としては、前記親水性ポリマーと架橋反応して親水性ポリマーを水に不溶性にすることにより親水性樹脂感光層の耐刷性を向上させるものであればよく、例えば、親水性ポリマー中の架橋性官能基である水酸基、カルボキシル基、スルホン酸基、グリシジル基、場合によってはアミド基と反応する公知の多価アルコール化合物類、多価カルボン酸化合物やその無水物類、多価グリシジル化合物類、多価アミン、多価イソシアネート化合物やブロックイソシアネート化合物、エポキシ樹脂、オキサゾリン樹脂、アミノ樹脂等が挙げられる。   As the crosslinking agent (b) contained in the photosensitive resin composition of the present invention, the printing durability of the hydrophilic resin photosensitive layer is improved by making the hydrophilic polymer insoluble in water by performing a crosslinking reaction with the hydrophilic polymer. Any known polyhydric alcohol compounds that react with a hydroxyl group, a carboxyl group, a sulfonic acid group, a glycidyl group, and in some cases, an amide group, which are crosslinkable functional groups in a hydrophilic polymer, Examples include carboxylic acid compounds and anhydrides thereof, polyvalent glycidyl compounds, polyvalent amines, polyvalent isocyanate compounds and blocked isocyanate compounds, epoxy resins, oxazoline resins, amino resins and the like.

本発明に於いては前記した架橋剤の中でも、架橋速度と感光性樹脂組成物の安定性や感光層の親水性と耐水性のバランス等から、水性エポキシ樹脂、オキサゾリン樹脂、アミノ樹脂、水性ブロックイソシアネート化合物が好ましい。アミノ樹脂としては、メラミン樹脂、尿素樹脂、ベンゾグアナミン樹脂やグリコールウリル樹脂等やこれらの樹脂の変性樹脂、例えばカルボキシ変性メラミン樹脂等が挙げられる。又、架橋反応を促進するために、前記したエポキシ樹脂を用いる際には3級アミン類を、アミノ樹脂を用いる場合にはパラトルエンスルホン酸、アルキルベンゼンスルホン酸類、塩化アンモニウム等の酸性化合物を併用しても良い。本発明に添加する水酸基価500mg−KOH/g以上であり且つ数平均分子量(Mn)が3000以下の有機物の親水性樹脂感光層中への固定化のためには水酸基と反応しやすい水性エポキシ樹脂、アミノ樹脂、水性ブロックイソシアネート化合物が好ましい。   In the present invention, among the crosslinking agents described above, from the viewpoint of the balance between the crosslinking rate and the stability of the photosensitive resin composition and the hydrophilicity and water resistance of the photosensitive layer, aqueous epoxy resins, oxazoline resins, amino resins, aqueous blocks Isocyanate compounds are preferred. Examples of the amino resin include a melamine resin, a urea resin, a benzoguanamine resin, a glycoluril resin, and the like, and modified resins of these resins, such as a carboxy-modified melamine resin. In order to accelerate the crosslinking reaction, tertiary amines are used when the above-mentioned epoxy resin is used, and acidic compounds such as paratoluenesulfonic acid, alkylbenzenesulfonic acid, and ammonium chloride are used together when using the amino resin. May be. Aqueous epoxy resin which has a hydroxyl value of 500 mg-KOH / g or more and which has a number average molecular weight (Mn) of 3000 or less and which is easily reacted with a hydroxyl group for immobilizing an organic substance in a photosensitive layer of a hydrophilic resin. , Amino resins and aqueous blocked isocyanate compounds are preferred.

上記架橋剤の主な役割は、前記親水性ポリマーを架橋し、親水性ポリマーを水に不溶性にすることであるが、さらに架橋剤が自己重合性を有する場合には、感光層において該架橋剤が親水性ポリマー中に重合体の島相を形成し、感光層中の光吸収剤が光を吸収剤して光エネルギーを熱エネルギーに変換する際、発生した熱により該島相が発泡したり融着したりして、光照射部表面の親水性を親インク性に変化させることも含まれる。   The main role of the cross-linking agent is to cross-link the hydrophilic polymer and make the hydrophilic polymer insoluble in water. However, when the cross-linking agent has self-polymerization property, the cross-linking agent is used in the photosensitive layer. Forms a polymer island phase in the hydrophilic polymer, and when the light absorber in the photosensitive layer converts light energy into heat energy by absorbing light, the generated heat may cause the island phase to foam. Changing the hydrophilicity of the surface of the light-irradiated portion to ink-philicity by fusing or the like is also included.

本発明の感光性樹脂組成物には、光の照射により感光層の照射部表面の親水性が親インク性に変化しやすいように、更に(e)親油性ポリマーを用いることも好ましい。親油性ポリマーとしては、版の感度、光照射した際の親インク化のしやすさ等から、動的光散乱法で測定した重量平均粒子径が0.005〜0.5μm程度の水分散親油性樹脂が好ましく、重量平均粒子径が0.01〜0.2μmのものが更に好ましい。水分散親油性樹脂とは、微細な親油性ポリマー粒子と必要に応じて該粒子を覆う保護剤とを水性液に分散させた親油性ポリマーを意味し、不飽和モノマーを乳化重合や懸濁重合することによって作られた親油性ポリマー、特に酸性基を有する親油性ポリマー、又は該ポリマーの有機溶剤溶液を必要ならば酸性基を中和したり、分散安定剤を加えて水中に分散させた親油性ポリマー、さらに必要ならば該有機溶剤を溜去して得られる親油性ポリマー等が挙げられる。水分散親油性樹脂は、より具体的には例えば、ビニルポリマー系ラテックス、共役ジエンポリマー系ラテックス、アクリル系ラテックス、水分散ポリウレタン樹脂、水分散エポキシ樹脂等が挙げられる。   In the photosensitive resin composition of the present invention, it is also preferable to use (e) a lipophilic polymer so that the hydrophilicity of the surface of the irradiated portion of the photosensitive layer is easily changed to ink-philicity by light irradiation. As the lipophilic polymer, a water-dispersed lipophilic polymer having a weight-average particle diameter of about 0.005 to 0.5 μm measured by a dynamic light scattering method is used in consideration of the sensitivity of the plate, the easiness of ink conversion when irradiated with light, and the like. Oily resins are preferred, and those having a weight average particle size of 0.01 to 0.2 μm are more preferred. The water-dispersed lipophilic resin means a lipophilic polymer in which fine lipophilic polymer particles and, if necessary, a protective agent covering the particles are dispersed in an aqueous liquid, and emulsion polymerization or suspension polymerization of an unsaturated monomer. A lipophilic polymer, particularly a lipophilic polymer having an acidic group, or an organic solvent solution of the polymer, which is neutralized with an acidic group if necessary or dispersed in water by adding a dispersion stabilizer. Examples include oil-based polymers, and, if necessary, lipophilic polymers obtained by distilling off the organic solvent. More specifically, examples of the water-dispersed lipophilic resin include a vinyl polymer-based latex, a conjugated diene polymer-based latex, an acrylic latex, a water-dispersed polyurethane resin, and a water-dispersed epoxy resin.

上記水分散親油性樹脂の役割は、感光層において該水分散親油性樹脂が親水性ポリマー中に島相として形成され、感光層中の光吸収剤が光を吸収剤して光エネルギーを熱エネルギーに変換した際、発生した熱により島相の水分散親油性樹脂が溶融・融着し、光照射部表面、即ち感光層の表面の親水性を親インク性に変化させることであると推定される。この溶融・融着による親インク性へ変化を効率よく行わせるには、水分散親油性樹脂の重量平均粒子径が前記したように0.005〜0.5μm程度であることが好ましい。この粒子径の範囲であれば、発生した熱で親油性樹脂が溶融・融着しやすく、感度に優れる。水分散親油性樹脂の重量平均粒子径は、水分散液を0.1重量%まで希釈し光散乱光を利用したレーザードップラー式粒度分布計マイクロトラックUPA−150での測定値である。   The role of the water-dispersed lipophilic resin is that the water-dispersed lipophilic resin is formed as an island phase in the hydrophilic polymer in the photosensitive layer, and the light absorber in the photosensitive layer absorbs light to convert light energy into heat energy. It is presumed that when converted to water, the water-dispersed lipophilic resin in the island phase is melted and fused by the generated heat, and the hydrophilicity of the surface of the light-irradiated portion, that is, the surface of the photosensitive layer is changed to ink-philicity. You. In order to efficiently change the ink lipophilicity due to the fusion / fusion, the weight average particle diameter of the water-dispersed lipophilic resin is preferably about 0.005 to 0.5 μm as described above. When the particle size is within the above range, the lipophilic resin is easily melted and fused by the generated heat, and the sensitivity is excellent. The weight average particle diameter of the water-dispersed lipophilic resin is a value measured by a laser Doppler type particle size distribution analyzer Microtrac UPA-150 using light scattering light after diluting the water dispersion to 0.1% by weight.

本発明の感光層に上記水分散親油性樹脂を使用する場合、親油性ポリマー量は光照射部の親インク化の点からは多い方が好ましいが、多くなり過ぎると地汚れを起こし好ましくない。この点から本発明に於ける感光性樹脂組成物中の親油性ポリマー量は、固形分として70重量%以下であることが好ましく、より好ましい範囲は0重量%以上60重量%以下である。   When the water-dispersed lipophilic resin is used in the photosensitive layer of the present invention, it is preferable that the amount of the lipophilic polymer is large from the viewpoint of making the light-irradiated portion ink-friendly. From this viewpoint, the amount of the lipophilic polymer in the photosensitive resin composition of the present invention is preferably 70% by weight or less as a solid content, and more preferably 0% by weight or more and 60% by weight or less.

本発明の感光性樹脂組成物に含有する(c)光吸収剤としては、光を吸収して熱を生じるものであればよく、光の照射に際しては光吸収剤が吸収する波長域の光を適宜用いればよい。光吸収剤の具体例としては、シアニン系色素、ポリメチン系色素、フタロシアニン系色素、ナフタロシアニン系色素、アントラシアニン系色素、ポルフィリン系色素、アゾ系色素、ベンゾキノン系色素、ナフトキノン系色素、ジチオール金属錯体類、ジアミンの金属錯体類、ニグロシン等の各種色素、及びカーボンブラック等が挙げられる。好ましくはシアニン系色素、フタロシアニン系色素、ナフタロシアニン系色素が挙げられる。組成物中に含有する好ましい量は、親水性ポリマー、架橋剤および親油性ポリマーの合計固形分100重量部に対し0.1〜30重量部、さらに好ましくは1〜20重量部である。この範囲であれば地汚れや耐刷性の低下といった印刷性に影響を与えない。   The (c) light absorber contained in the photosensitive resin composition of the present invention may be any as long as it absorbs light and generates heat. When irradiating light, light in the wavelength range absorbed by the light absorber is used. It may be used as appropriate. Specific examples of the light absorber include a cyanine dye, a polymethine dye, a phthalocyanine dye, a naphthalocyanine dye, an anthocyanin dye, a porphyrin dye, an azo dye, a benzoquinone dye, a naphthoquinone dye, and a dithiol metal complex. , Metal complexes of diamines, various dyes such as nigrosine, and carbon black. Preferred are cyanine dyes, phthalocyanine dyes, and naphthalocyanine dyes. The preferred amount contained in the composition is 0.1 to 30 parts by weight, more preferably 1 to 20 parts by weight, based on 100 parts by weight of the total solid content of the hydrophilic polymer, the crosslinking agent and the lipophilic polymer. Within this range, there is no effect on printability such as background contamination and reduction in printing durability.

これらの色素に於いては、明室での取り扱い性、露光機に用いる光源の出力や使い易さの点から波長750〜1100nmの領域の光を吸収する色素が好ましい。色素の吸収波長域に関しては置換基やπ電子の共役系の長さ等により変えることが出来る。これらの光吸収剤は感光性樹脂組成物に溶解していても、又分散していても良い。前記した光吸収剤の中では、本発明に於いては親水性の光吸収剤が好ましい。   Among these dyes, dyes that absorb light in the wavelength range of 750 to 1100 nm are preferred from the viewpoints of handling in a bright room, output of a light source used in an exposure machine, and ease of use. The absorption wavelength range of the dye can be changed depending on the length of the substituent, the conjugated system of π electrons, and the like. These light absorbers may be dissolved or dispersed in the photosensitive resin composition. Among the above light absorbers, hydrophilic light absorbers are preferred in the present invention.

さらに、本発明の感光性樹脂組成物には、印刷条件に対する安定性を広げるため、種々の界面活性剤を添加することが望ましい。前記界面活性剤としては、アニオン性界面活性剤、カチオン性界面活性剤、非イオン性界面活性剤及び両性界面活性剤等が挙げられる。また、感光性樹脂組成物の塗布性を良化するため、ハジキ防止剤、レベリング剤等の添加剤を添加しても良い。   Furthermore, it is desirable to add various surfactants to the photosensitive resin composition of the present invention in order to increase stability under printing conditions. Examples of the surfactant include an anionic surfactant, a cationic surfactant, a nonionic surfactant, and an amphoteric surfactant. Further, in order to improve the applicability of the photosensitive resin composition, additives such as an anti-cissing agent and a leveling agent may be added.

本発明の平版印刷用の原版は、好ましくは基板上に感光性樹脂組成物を架橋してなる水に不溶性の親水性樹脂感光層を設けてなるものである。この際用いられる基板の具体例としては、アルミ板、鋼板、ステンレス板、銅板等の金属板やポリエステル、ナイロン、ポリエチレン、ポリプロピレン、ポリカーボネート、ABS樹脂等のプラスチックフィルムや紙、アルミ箔ラミネート紙、金属蒸着紙、プラスチックフィルムラミネート紙等が挙げられる。低コストおよび軽量で取り扱いやすいことから、好ましくはアルミ板、プラスチックフィルム、紙が挙げられる。これらの基材の厚さは特に制限はないが通常100〜400μm程度である。又、これらの基材には密着性の改良等のために酸化処理、クロメート処理、サンドブラスト処理、コロナ放電処理等の表面処理を施してもよい。   The lithographic printing plate precursor of the present invention preferably has a water-insoluble hydrophilic resin photosensitive layer formed by crosslinking a photosensitive resin composition on a substrate. Specific examples of the substrate used at this time include a metal plate such as an aluminum plate, a steel plate, a stainless steel plate, and a copper plate; a plastic film or paper such as polyester, nylon, polyethylene, polypropylene, polycarbonate, and ABS resin; an aluminum foil laminated paper; Evaporated paper, plastic film laminated paper and the like can be mentioned. Aluminum plates, plastic films, and paper are preferred because they are low-cost, lightweight, and easy to handle. The thickness of these substrates is not particularly limited, but is usually about 100 to 400 μm. In addition, these substrates may be subjected to a surface treatment such as an oxidation treatment, a chromate treatment, a sand blast treatment, a corona discharge treatment or the like for improving the adhesion.

本発明の水に不溶性の親水性樹脂からなる感光層は、(a)親水性ポリマー、(b)架橋剤、(c)光吸収剤及び(d)水酸基価500mg−KOH/g以上であり且つ数平均分子量(Mn)が3000以下の有機物を含有する感光性樹脂組成物からなる溶液、あるいは(a)親水性ポリマー、(b)架橋剤、(e)親油性ポリマー、(c)光吸収剤及び(d)水酸基価500mg−KOH/g以上であり且つ且つ数平均分子量(Mn)が3000以下の有機物を含有する感光性樹脂組成物からなる溶液を基板に塗布し、乾燥、硬化すればよい。塗布する方法としては塗布する溶液の粘度や塗布速度等によって異なるが、公知の方法でよく、例えば、ロールコーター、ブレードコーター、グラビアコーター、カーテンフローコーター、ダイコーターやスプレー法等を用いれば良い。塗布溶液を塗布した後、加熱して乾燥及び親水性ポリマーの架橋を行なう。加熱は通常50〜200℃程度、時間は10秒〜2時間程度であれば十分である。   The photosensitive layer comprising a water-insoluble hydrophilic resin of the present invention has (a) a hydrophilic polymer, (b) a crosslinking agent, (c) a light absorber, and (d) a hydroxyl value of 500 mg-KOH / g or more; A solution composed of a photosensitive resin composition containing an organic substance having a number average molecular weight (Mn) of 3000 or less, or (a) a hydrophilic polymer, (b) a crosslinking agent, (e) a lipophilic polymer, and (c) a light absorbing agent And (d) a solution comprising a photosensitive resin composition containing an organic substance having a hydroxyl value of 500 mg-KOH / g or more and a number average molecular weight (Mn) of 3000 or less may be applied to a substrate, and dried and cured. . The method of application varies depending on the viscosity of the solution to be applied, the application speed, and the like, but may be a known method, for example, a roll coater, a blade coater, a gravure coater, a curtain flow coater, a die coater, a spray method, or the like may be used. After applying the coating solution, the coating solution is heated to dry and crosslink the hydrophilic polymer. Sufficient heating is usually about 50 to 200 ° C. and time is about 10 seconds to 2 hours.

本発明の平版印刷用の原版は、光吸収剤の吸収波長域の光、例えば750〜1100nmの領域の光を照射すると、光吸収剤が光を吸収して発熱する。この発熱により感光層の光照射部は、自己重合した架橋剤や親油性ポリマーが発泡したり熱融着したりして、親水性が失われ親インク化する。この際、光の照射量を大きくし過ぎたり、又光吸収剤を多量に添加し過ぎたりすると、感光層が分解、燃焼等によって除去、融除されてしまい、照射部の周辺に分解物が飛散するので、このようなことは避けなければならない。   When the lithographic printing plate precursor of the present invention is irradiated with light in the absorption wavelength range of the light absorber, for example, light in the range of 750 to 1100 nm, the light absorber absorbs the light and generates heat. Due to this heat generation, the self-polymerized cross-linking agent or lipophilic polymer foams or heat-fuses the light-irradiated portion of the photosensitive layer to lose hydrophilicity and become ink-philic. At this time, if the light irradiation amount is too large or too much light absorbing agent is added, the photosensitive layer is removed or ablated by decomposition, burning, etc., and decomposed products around the irradiated part. This must be avoided as it will scatter.

このように本発明の平版印刷用の原版は光を照射した部分の感光層表面の親水性が親インク性に変化し、現像や拭き取り操作をしなくても光の照射部にはインクが付着し、印刷が可能となる。   As described above, in the lithographic printing plate precursor of the present invention, the hydrophilicity of the photosensitive layer surface in the light-irradiated portion changes to ink-philicity, and ink adheres to the light-irradiated portion without performing development or wiping operation. Then, printing becomes possible.

本発明の平版印刷用の原版の光照射に際しては、照射速度の点から収束光を高速で走査するのが好ましく、使用し易い。また、光源としては高出力のものが適しており、この点から、照射する光としてはレーザー光、特に750〜1100nmの波長域の発振波長を有するレーザー光が好ましく、例えば830nmの高出力半導体レーザーや1064nmのYAGレーザーが好ましく用いられる。これらのレーザーを搭載した露光機は所謂サーマル用プレートセッター(露光機)として既に市場に供されている。   When irradiating the lithographic printing plate precursor of the present invention with light, it is preferable to scan convergent light at high speed from the viewpoint of irradiation speed, and it is easy to use. In addition, a high-power light source is suitable as the light source. In this respect, a laser beam, particularly a laser beam having an oscillation wavelength in a wavelength range of 750 to 1100 nm, is preferable as the irradiation light. Or a 1064 nm YAG laser is preferably used. Exposure machines equipped with these lasers are already on the market as so-called thermal plate setters (exposure machines).

以下、実施例により更に詳細に本発明を説明するが、本発明はこれらに限定されるものではない。尚、下記値は、以下のようにして求めた。
水酸基価:物質1gをアセチル化するとき水酸基と結合した酢酸を中和するのに必要なKOHのmg数の計算値である。
数平均分子量:GPC−MALLSにより、測定し、ポリスチレン換算した値である。尚GPC−MALLSの測定条件は以下の通りである。
Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto. The following values were obtained as follows.
Hydroxyl value: It is a calculated value of the number of mg of KOH required to neutralize acetic acid bonded to a hydroxyl group when acetylating 1 g of a substance.
Number average molecular weight: It is a value measured by GPC-MALLS and converted into polystyrene. The measurement conditions of GPC-MALLS are as follows.

GPC本体:昭和電工(株)製、システム11
カラム;SHODEX SB-G + SHODEX SB-806M HQ ×2
溶離液;N/10硝酸ナトリウムを含むN/15リン酸緩衝液(pH7)
流速;1.0ml/分
検出器;ワイアットテクノロジー社製、多角度光散乱検出器DAWN
GPC: Showa Denko KK, System 11
Column; SHODEX SB-G + SHODEX SB-806M HQ x 2
Eluent: N / 15 phosphate buffer (pH 7) containing N / 10 sodium nitrate
Flow rate: 1.0 ml / min Detector: Multi-angle light scattering detector DAWN manufactured by Wyatt Technology

[実施例1]
(親水性ポリマーP−1の合成)
1000ccのフラスコに水400gを入れ、窒素をバブリングして溶存酸素を除去した後、80℃に昇温した。窒素ガスを上記フラスコに流しながら、そこにアクリルアミド95.3g、ヒドロキシエチルアクリレート24.7g、水130gからなるモノマー溶液と、過硫酸カリ1.0gを水100gに溶解した開始剤の水溶液とを、内温を80℃に維持しながら、別々に2時間に渡り連続滴下した。滴下終了後80℃で3時間重合を続けた。最後に水50gを加え、親水性ポリマーP−1の15%水溶液を合成した。
(平版印刷用の原版の作成)
接着性向上のため、予めプライマーとして1μmの厚さのウレタン樹脂(三井化学(株)製ウレタン樹脂:登録商標オレスターUD350)を塗布した厚さ0.3mmのアルミニウム板に、下記組成(単位重量部、以下同様)からなる感光性樹脂組成物の水溶液をワイヤーバーを用いて塗布した後、120℃で30分間乾燥し、2μmの膜厚の感光層を成膜して平版印刷用の原版を作成した。
[Example 1]
(Synthesis of hydrophilic polymer P-1)
400 g of water was put into a 1000 cc flask, and dissolved oxygen was removed by bubbling nitrogen, and then the temperature was raised to 80 ° C. While flowing nitrogen gas into the flask, a monomer solution consisting of 95.3 g of acrylamide, 24.7 g of hydroxyethyl acrylate and 130 g of water and an aqueous solution of an initiator obtained by dissolving 1.0 g of potassium persulfate in 100 g of water were added thereto. While maintaining the internal temperature at 80 ° C., the mixture was continuously dropped separately over 2 hours. After completion of the dropwise addition, polymerization was continued at 80 ° C. for 3 hours. Finally, 50 g of water was added to synthesize a 15% aqueous solution of the hydrophilic polymer P-1.
(Preparation of an original plate for lithographic printing)
In order to improve the adhesiveness, a 0.3 mm-thick aluminum plate to which a urethane resin having a thickness of 1 μm (urethane resin manufactured by Mitsui Chemicals, Inc .: registered trademark Olester UD350) was previously applied as a primer was applied with the following composition (unit weight: Part, the same shall apply hereinafter), using a wire bar, applying an aqueous solution of the photosensitive resin composition, drying at 120 ° C. for 30 minutes to form a photosensitive layer having a thickness of 2 μm, and preparing an original plate for lithographic printing. Created.

上記親水性ポリマーP−1の水溶液(固形分15重量%):267部
メチル化メラミン樹脂(三井サイテック(株)製:登録商標サイメル385、固形分80重量%):12.5部
水分散ウレタン樹脂(三井化学(株)製:登録商標オレスターUD350、固形分40重量%):125部
シアニン色素水溶液(日本感光性色素(株)製:IR−125、固形分5重量%):100部
アニオン性界面活性剤(第一工業製薬(株)製:登録商標ネオコールYSK、固形分70重量%):0.15部
グルコース水溶液(固形分10重量%、水酸基価1560mg−KOH/g、数平均分子量180.2g/mol):10部(親水性ポリマー、架橋剤および親油性ポリマーの合計固形分100重量部に対し0.9重量部)
(描画)
この原版に波長830nmの半導体レーザー光を200mJ/cm2の照射エネルギー密度となるように集光しながら走査照射して、200線/インチの画像情報の描画を行った。
(印刷評価)
この描画した版をオフセット印刷機(三菱重工業(株)製ダイヤ1F−4)にセットし、湿し水として(株)日研化学研究所のH液アストロマーク3の2%水溶液、インクとして東洋インキ製造(株)製の登録商標ハイエコーSOYを使用して印刷を行った。その結果、湿し水量をPS版で用いる量と同じ量、すなわち印刷機目盛りで50に減らしても光の未照射部にはインクが全く付かず、一方、照射部にはインクが十分に付着し、描画した画像が印刷用紙上に再現された。5千枚印刷後でも未照射部にはインクが全く付かず、照射部へのインク付着性も損なわれなかった。
Aqueous solution of the above hydrophilic polymer P-1 (solid content 15% by weight): 267 parts Methylated melamine resin (manufactured by Mitsui Cytec Co., Ltd .: Cymel 385, solid content 80% by weight): 12.5 parts Water-dispersed urethane Resin (manufactured by Mitsui Chemicals, Inc .: registered trademark Olester UD350, solid content: 40% by weight): 125 parts Cyanine dye aqueous solution (manufactured by Nippon Kogaku Dyeing Co., Ltd .: IR-125, solid content: 5% by weight): 100 parts Anionic surfactant (manufactured by Daiichi Kogyo Seiyaku Co., Ltd .: Neocol YSK, solid content 70% by weight): 0.15 parts Glucose aqueous solution (solid content 10% by weight, hydroxyl value 1560 mg-KOH / g, number average) Molecular weight: 180.2 g / mol): 10 parts (0.9 parts by weight based on 100 parts by weight of the total solid content of the hydrophilic polymer, the crosslinking agent and the lipophilic polymer)
(drawing)
The original plate was scanned and irradiated with a semiconductor laser light having a wavelength of 830 nm so as to have an irradiation energy density of 200 mJ / cm 2 , and 200 lines / inch of image information was drawn.
(Print evaluation)
The drawn plate was set on an offset printing machine (Dia 1F-4, manufactured by Mitsubishi Heavy Industries, Ltd.), and a 2% aqueous solution of Astromark 3 of Liquid H from Niken Chemical Laboratory Co., Ltd. was used as a dampening solution, and Toyo was used as an ink. Printing was performed using HiEcho SOY (registered trademark) manufactured by Ink Manufacturing Co., Ltd. As a result, even if the dampening water amount is reduced to the same amount as that used for the PS plate, that is, reduced to 50 on the printing press scale, no ink is applied to the unirradiated portion, while the ink is sufficiently attached to the irradiated portion. Then, the drawn image was reproduced on printing paper. Even after printing 5,000 sheets, no ink was applied to the non-irradiated portions, and the ink adhesion to the irradiated portions was not impaired.

[実施例2]
実施例1のグルコース水溶液量を500部(親水性ポリマー、架橋剤および親油性ポリマーの合計固形分100重量部に対して9.0重量部)に代えた以外は、実施例1と同様にして印刷原版を作り、描画および印刷評価を行なったところ、湿し水量をPS版で用いる量と同じ量、すなわち印刷機目盛りで50まで減らしても光の未照射部にはインクが全く付かず、一方、照射部にはインクが十分に付着し、描画した画像が印刷用紙上に再現された。
[Example 2]
In the same manner as in Example 1 except that the amount of the glucose aqueous solution in Example 1 was changed to 500 parts (9.0 parts by weight based on 100 parts by weight of the total solid content of the hydrophilic polymer, the crosslinking agent and the lipophilic polymer). When a printing original plate was prepared, drawing and printing evaluation were performed, even if the dampening water amount was the same as the amount used in the PS plate, that is, even if it was reduced to 50 on the printing press scale, no ink was applied to the unirradiated portion of the light, On the other hand, the ink was sufficiently adhered to the irradiation part, and the drawn image was reproduced on the printing paper.

[実施例3]
実施例1の親水性ポリマーをポリアクリルアミド水溶液(固形分15重量%)に代え、乾燥を120℃で2時間にした以外は実施例1と同様にして印刷原版を作り、描画および印刷評価を行なったところ、湿し水量をPS版で用いる量と同じ量、すなわち印刷機目盛りで50に減らしても光の未照射部にはインクが全く付かず、一方、照射部にはインクが十分に付着し、描画した画像が印刷用紙上に再現された。5千枚印刷後でも未照射部にはインクが全く付かず、照射部へのインク付着性も損なわれなかった。
[Example 3]
A printing original plate was prepared in the same manner as in Example 1 except that the hydrophilic polymer in Example 1 was replaced with an aqueous solution of polyacrylamide (solid content: 15% by weight) and drying was performed at 120 ° C. for 2 hours, and drawing and print evaluation were performed. As a result, even if the dampening water amount was reduced to the same amount as that used for the PS plate, that is, reduced to 50 on the printing press scale, no ink was applied to the unirradiated portion, while the ink was sufficiently attached to the irradiated portion. Then, the drawn image was reproduced on printing paper. Even after printing 5,000 sheets, no ink was applied to the non-irradiated portions, and the ink adhesion to the irradiated portions was not impaired.

[実施例4]
実施例1の感光性樹脂組成物を下記組成に代えた以外は実施例1と同様にして平版印刷用の原版を作った。
[Example 4]
An original plate for lithographic printing was prepared in the same manner as in Example 1 except that the photosensitive resin composition of Example 1 was changed to the following composition.

上記親水性ポリマーP−1の水溶液(固形分15重量%):400部
メチル化メラミン樹脂(三井サイテック(株)製:登録商標サイメル701、固形分80重量%):50部
シアニン色素水溶液(日本感光性色素(株)製:IR−125、固形分5重量%):100部
アニオン性界面活性剤(第一工業製薬(株)製:登録商標ネオコールYSK、固形分70重量%):0.15部
グルコース水溶液(固形分10重量%、水酸基価1560mg−KOH/g、数平均分子量180.2g/mol):50部(親水性ポリマー、架橋剤および親油性ポリマーの合計固形分100重量部に対し4.5重量部)
この版に波長830nmの半導体レーザー光を350mJ/cm2の照射エネルギー密度となるように集光しながら走査照射して、200線/インチの画像情報の描画を行い、印刷評価を行ったところ、湿し水量をPS版で用いる量と同じ量、すなわち印刷機目盛りで50に減らしても光の未照射部にはインクが全く付かず、一方、照射部にはインクが十分に付着し、描画した画像が印刷用紙上に再現された。5千枚印刷後でも未照射部にはインクが全く付かず、照射部へのインク付着性も損なわれなかった。
Aqueous solution of the above-mentioned hydrophilic polymer P-1 (solid content 15% by weight): 400 parts Methylated melamine resin (manufactured by Mitsui Cytec Co., Ltd .: Cymel 701 registered trademark, solid content 80% by weight): 50 parts Cyanine dye aqueous solution (Japan Photosensitive Dye Co., Ltd .: IR-125, solid content 5% by weight): 100 parts Anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd .: Neocol YSK, solid content 70% by weight): 0. 15 parts glucose aqueous solution (solid content 10% by weight, hydroxyl value 1560 mg-KOH / g, number average molecular weight 180.2 g / mol): 50 parts (based on 100 parts by weight of the total solid content of the hydrophilic polymer, the crosslinking agent and the lipophilic polymer) 4.5 parts by weight)
The plate was scanned and irradiated with a semiconductor laser light having a wavelength of 830 nm while being focused so as to have an irradiation energy density of 350 mJ / cm 2 , and image information of 200 lines / inch was drawn. Even if the dampening water is reduced to the same amount as that used in the PS plate, that is, reduced to 50 on the printing press scale, no ink is applied to the unirradiated portion, while the ink is sufficiently attached to the irradiated portion and the drawing is performed. The reproduced image was reproduced on the printing paper. Even after printing 5,000 sheets, no ink was applied to the non-irradiated portions, and the ink adhesion to the irradiated portions was not impaired.

[実施例5]
実施例1のグルコース水溶液をタンニン酸水溶液(固形分10重量%、水酸基価950mg−KOH/g、数平均分子量1701.23g/mol)に代えた以外は、実施例1と同様にして印刷原版を作り、描画および印刷評価を行なったところ、湿し水量をPS版で用いる量と同じ量、すなわち印刷機目盛りで50に減らしても光の未照射部にはインクが全く付かず、一方、照射部にはインクが十分に付着し、描画した画像が印刷用紙上に再現された。5千枚印刷後でも未照射部にはインクが全く付かず、照射部へのインク付着性も損なわれなかった。
[Example 5]
A printing original plate was prepared in the same manner as in Example 1 except that the aqueous glucose solution of Example 1 was replaced with an aqueous solution of tannic acid (solid content: 10% by weight, hydroxyl value: 950 mg-KOH / g, number average molecular weight: 1701.23 g / mol). After making, drawing and printing evaluation, even if the dampening water amount was reduced to the same amount as that used in the PS plate, that is, reduced to 50 on the printing press scale, no ink was applied to the non-irradiated portion of the light, while The ink adhered sufficiently to the portion, and the drawn image was reproduced on the printing paper. Even after printing 5,000 sheets, no ink was applied to the non-irradiated portions, and the ink adhesion to the irradiated portions was not impaired.

[実施例6]
実施例5のタンニン酸水溶液量を250部(親水性ポリマー、架橋剤および親油性ポリマーの合計固形分100重量部に対し4.5重量部)に代えた以外は、実施例5と同様にして印刷原版を作り、描画および印刷評価を行なったところ、湿し水量をPS版で用いる量と同じ量、すなわち印刷機目盛りで50に減らしても光の未照射部にはインクが全く付かず、一方、照射部にはインクが十分に付着し、描画した画像が印刷用紙上に再現された。5千枚印刷後でも未照射部にはインクが全く付かず、照射部へのインク付着性も損なわれなかった。
[Example 6]
In the same manner as in Example 5 except that the amount of the tannic acid aqueous solution in Example 5 was changed to 250 parts (4.5 parts by weight based on 100 parts by weight of the total solid content of the hydrophilic polymer, the crosslinking agent, and the lipophilic polymer). When a printing original plate was made and drawing and printing evaluation were performed, even if the dampening solution amount was the same as the amount used in the PS plate, that is, even if it was reduced to 50 on the printing press scale, no ink was applied to the unirradiated portion of the light, On the other hand, the ink was sufficiently adhered to the irradiation part, and the drawn image was reproduced on the printing paper. Even after printing 5,000 sheets, no ink was applied to the non-irradiated portions, and the ink adhesion to the irradiated portions was not impaired.

[実施例7]
実施例1のグルコース水溶液量を1000部(親水性ポリマー、架橋剤および親油性ポリマーの合計固形分100重量部に対し18.0重量部)に代えた以外は、実施例1と同様にして印刷原版を作り、描画および印刷評価を行なったところ、湿し水量をPS版で用いる量と同じ量、すなわち印刷機目盛りで50まで減らしても光の未照射部にはインクが全く付かず、一方、照射部にはインクが十分に付着し、描画した画像が印刷用紙上に再現された。しかし、800枚で一部に剥離が起こり印刷を続けることができなかった。
[Example 7]
Printing was performed in the same manner as in Example 1, except that the amount of the aqueous glucose solution in Example 1 was changed to 1000 parts (18.0 parts by weight based on 100 parts by weight of the total solid content of the hydrophilic polymer, the crosslinking agent, and the lipophilic polymer). When the original plate was made, and the drawing and printing evaluation were performed, even if the dampening water amount was the same as the amount used for the PS plate, that is, even if it was reduced to 50 on the scale of the printing press, no ink was attached to the unirradiated portion of the light. The ink was sufficiently adhered to the irradiation section, and the drawn image was reproduced on the printing paper. However, 800 sheets were peeled off partly and printing could not be continued.

[比較例1]
実施例1のグルコースを添加しないこと以外は実施例1と同様にして平版印刷用の原版を作り、描画および印刷評価を行なったところ、湿し水量がPS版で用いる量よりも多い、印刷機目盛りで70のときには光の未照射部にはインクが全く付かず、一方、照射部にはインクが十分に付着し、描画した画像が印刷用紙上に再現されたが、湿し水量をPS版で用いる量と同じ量、すなわち印刷機目盛りで50まで減らすと地汚れが発生した。
[Comparative Example 1]
A lithographic printing original plate was prepared in the same manner as in Example 1 except that glucose was not added, and drawing and printing evaluations were performed. When the scale is 70, no ink is applied to the light-irradiated portion, while the ink is sufficiently attached to the irradiated portion, and the drawn image is reproduced on the printing paper. When the amount was reduced to the same amount as that used in the above, that is, reduced to 50 on the printing press scale, background staining occurred.

[比較例2]
実施例1のグルコース水溶液を第一工業製薬(株)製界面活性剤登録商標エパン720水溶液(固形分10重量%、水酸基価45mg−KOH/g、数平均分子量2500g/mol)に代えた以外は、実施例1と同様にして印刷原版を作り、描画および印刷評価を行なったところ、湿し水量がPS版で用いる量よりも多い、印刷機目盛りで75のときでも一部に点状の地汚れが発生した。
[Comparative Example 2]
Except that the aqueous glucose solution of Example 1 was replaced with an aqueous solution of Epan 720, a surfactant registered trademark of Daiichi Kogyo Seiyaku Co., Ltd. (solid content 10% by weight, hydroxyl value 45 mg-KOH / g, number average molecular weight 2500 g / mol). When a printing original plate was prepared in the same manner as in Example 1, drawing and printing evaluation were performed, the amount of dampening water was larger than that used for the PS plate. Dirt has occurred.

[比較例3]
実施例1のグルコース水溶液を数平均分子量14000g/molのポリエチレングリコール水溶液(固形分10重量%、水酸基価8mg−KOH/g)に代えた以外は、実施例1と同様にして印刷原版を作り、描画および印刷評価を行なったところ、湿し水量がPS版で用いる量よりも多い、印刷機目盛り75のときには光の未照射部にはインクが全く付かず、一方、照射部にはインクが十分に付着し、描画した画像が印刷用紙上に再現されたが、湿し水量をPS版で用いる量と同じ量、すなわち印刷機目盛りで50まで減らすと地汚れが発生した。
[Comparative Example 3]
A printing original plate was prepared in the same manner as in Example 1, except that the aqueous glucose solution of Example 1 was replaced with an aqueous solution of polyethylene glycol having a number average molecular weight of 14000 g / mol (solid content: 10% by weight, hydroxyl value: 8 mg-KOH / g). When the drawing and printing evaluation were performed, the dampening water amount was larger than the amount used in the PS plate. At the time of the printing press scale 75, no ink was applied to the unirradiated portion of the light, while the irradiated portion was sufficiently filled with the ink. And the drawn image was reproduced on the printing paper. However, when the dampening water amount was reduced to the same amount as that used for the PS plate, that is, reduced to 50 on the printing press scale, background staining occurred.

[比較例4]
実施例1のグルコース水溶液を数平均分子量9000g/molのポリビニルアルコール水溶液(固形分10重量%、水酸基価1275mg−KOH/g)に代えた以外は、実施例1と同様にして印刷原版を作り、描画および印刷評価を行なったところ、湿し水量がPS版で用いる量よりも多い、印刷機目盛り65のときには光の未照射部にはインクが全く付かず、一方、照射部にはインクが十分に付着し、描画した画像が印刷用紙上に再現されたが、湿し水量をPS版で用いる量と同じ量、すなわち印刷機目盛りで50まで減らすと地汚れが発生した。
[Comparative Example 4]
A printing original plate was prepared in the same manner as in Example 1, except that the aqueous glucose solution of Example 1 was replaced with an aqueous solution of polyvinyl alcohol having a number average molecular weight of 9000 g / mol (solid content: 10% by weight, hydroxyl value: 1275 mg-KOH / g). When the drawing and print evaluation were performed, the dampening water amount was larger than the amount used in the PS plate. At the time of the printing machine scale 65, no ink was applied to the non-irradiated portion of the light, while the irradiated portion was sufficiently inked. And the drawn image was reproduced on the printing paper. However, when the dampening water amount was reduced to the same amount as that used for the PS plate, that is, reduced to 50 on the printing press scale, background staining occurred.

湿し水を用いる平版印刷用の原版において、水に不溶の親水性樹脂感光層を設け、光の照射により該感光層の親水性を親油性に変化させることにより、現像や拭き取りなどの工程が不要で、且つ湿し水の量を減らしても地汚れし難いCTP用の印刷版を提供する。   In a lithographic printing original plate using a dampening solution, a hydrophilic resin photosensitive layer insoluble in water is provided, and the hydrophilicity of the photosensitive layer is changed to lipophilic by light irradiation, so that processes such as development and wiping are performed. Provided is a printing plate for CTP which is unnecessary and hardly soils even if the amount of dampening water is reduced.

Claims (5)

湿し水を用いる平版印刷用の原版において、
(a)親水性ポリマー、
(b)架橋剤、
(c)光吸収剤、及び
(d)水酸基価が500mg−KOH/g以上であり且つ数平均分子量(Mn)が3000g/mol以下の有機物
を含有する感光性樹脂組成物を架橋してなる親水性樹脂感光層を有することを特徴とする平版印刷用の原版。
In a lithographic printing plate using dampening solution,
(A) a hydrophilic polymer,
(B) a crosslinking agent,
(C) a light absorbing agent, and (d) hydrophilicity obtained by crosslinking a photosensitive resin composition containing an organic substance having a hydroxyl value of 500 mg-KOH / g or more and a number average molecular weight (Mn) of 3000 g / mol or less. An original plate for lithographic printing, comprising a photosensitive resin photosensitive layer.
前記感光性樹脂組成物が、さらに(e)親油性ポリマーを含有するものである請求項1記載の平版印刷用の原版。 2. The lithographic printing plate precursor according to claim 1, wherein the photosensitive resin composition further contains (e) a lipophilic polymer. 前記親水性樹脂感光層が、光の照射により照射部表面の親水性が親インク性に変化する性質を有するものである請求項1又は2記載の平版印刷用の原版。 The lithographic printing plate precursor according to claim 1, wherein the hydrophilic resin photosensitive layer has a property that the hydrophilicity of the surface of the irradiated portion changes to ink-philicity by light irradiation. 前記(d)水酸基価500mg−KOH/g以上であり且つ数平均分子量(Mn)が3000g/mol以下の有機物が、酸基を有する有機物、多価アルコール類、糖類、およびこれらの置換体から選ばれる少なくとも1種以上の有機物である請求項1乃至3に記載の平版印刷用の原版。 The (d) organic substance having a hydroxyl value of 500 mg-KOH / g or more and a number average molecular weight (Mn) of 3000 g / mol or less is selected from organic substances having an acid group, polyhydric alcohols, saccharides, and substituted products thereof. 4. The lithographic printing plate precursor according to claim 1, which is at least one kind of organic substance. 前記(d)水酸基価が500mg−KOH/g以上であり且つ数平均分子量(Mn)が3000g/mol以下の有機物の添加量が、親水性ポリマー、架橋剤および親油性ポリマーの合計固形分100重量部に対し0.1〜15重量部である請求項1乃至4に記載の平版印刷用の原版。 (D) The addition amount of the organic substance having a hydroxyl value of 500 mg-KOH / g or more and a number average molecular weight (Mn) of 3000 g / mol or less is 100% by weight of the total solid content of the hydrophilic polymer, the crosslinking agent, and the lipophilic polymer. 5. The lithographic printing plate precursor according to claim 1, wherein the amount is 0.1 to 15 parts by weight per part.
JP2003426364A 2002-12-27 2003-12-24 Original plate for lithographic printing Pending JP2004216885A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006350039A (en) * 2005-06-16 2006-12-28 Fujitsu Ltd Resist composition, method for forming resist pattern, semiconductor device and method for manufacturing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006350039A (en) * 2005-06-16 2006-12-28 Fujitsu Ltd Resist composition, method for forming resist pattern, semiconductor device and method for manufacturing the same
JP4588551B2 (en) * 2005-06-16 2010-12-01 富士通株式会社 Resist composition, method for forming resist pattern, semiconductor device and method for manufacturing the same

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