JPH0453961A - Original plate for planographic printing - Google Patents
Original plate for planographic printingInfo
- Publication number
- JPH0453961A JPH0453961A JP16276390A JP16276390A JPH0453961A JP H0453961 A JPH0453961 A JP H0453961A JP 16276390 A JP16276390 A JP 16276390A JP 16276390 A JP16276390 A JP 16276390A JP H0453961 A JPH0453961 A JP H0453961A
- Authority
- JP
- Japan
- Prior art keywords
- photosensitive layer
- calcium sulfate
- zinc oxide
- original plate
- water retention
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 33
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 22
- 239000011787 zinc oxide Substances 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 abstract description 9
- 239000000654 additive Substances 0.000 abstract description 5
- 239000000975 dye Substances 0.000 abstract description 5
- 230000001235 sensitizing effect Effects 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 229910052925 anhydrite Inorganic materials 0.000 abstract 1
- 206010016807 Fluid retention Diseases 0.000 description 11
- 238000000576 coating method Methods 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 235000011132 calcium sulphate Nutrition 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 238000010186 staining Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- LRFVTYWOQMYALW-UHFFFAOYSA-N 9H-xanthine Chemical compound O=C1NC(=O)NC2=C1NC=N2 LRFVTYWOQMYALW-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 description 1
- 239000012461 cellulose resin Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000000586 desensitisation Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- FWQHNLCNFPYBCA-UHFFFAOYSA-N fluoran Chemical compound C12=CC=CC=C2OC2=CC=CC=C2C11OC(=O)C2=CC=CC=C21 FWQHNLCNFPYBCA-UHFFFAOYSA-N 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 description 1
- -1 trihydrate salts Chemical class 0.000 description 1
- AAAQKTZKLRYKHR-UHFFFAOYSA-N triphenylmethane Chemical compound C1=CC=CC=C1C(C=1C=CC=CC=1)C1=CC=CC=C1 AAAQKTZKLRYKHR-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 229940075420 xanthine Drugs 0.000 description 1
Landscapes
- Photoreceptors In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、電子写真方式により製版する平版印刷用原版
に関するものであり、詳しくは光導電剤として酸化亜鉛
を用いた平版印刷用原版の印刷適性、具体的には保水性
の改良に関するものである。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a lithographic printing original plate made by an electrophotographic method, and more specifically, to printing of a lithographic printing original plate using zinc oxide as a photoconductive agent. It relates to the improvement of suitability, specifically water retention.
〈従来の技術〉
一般に、電子写真方式により製版する酸化亜鉛を光導電
剤として用いている平版印刷用原版は、結着剤中に酸化
亜鉛粉末、必要に応じて増感色素、各種添加剤等を分散
してなる感光層が支持体上に設けられたものである。こ
のような平版印刷用原版は、印刷用原版としての優れた
印刷特性と共に、電子写真特性、物理的強度等の特性を
兼ね備えたものでなければならない。<Prior art> In general, lithographic printing original plates using zinc oxide as a photoconductive agent, which are made by electrophotography, contain zinc oxide powder in the binder, sensitizing dyes as necessary, various additives, etc. A photosensitive layer formed by dispersing is provided on a support. Such a lithographic printing original plate must have excellent printing properties as a printing original plate, as well as other properties such as electrophotographic properties and physical strength.
近年、印刷における原版の耐久性に対する要望が強くな
っているが、従来の酸化亜鉛を用いた平版印刷用原版は
耐久性の中でもとりわけ保水性が十分なものではなかっ
た。印刷用原版において優れた保水性を有すると、いわ
ゆる“版汚れ”が少なく、その結果として鮮明な印刷物
を得ることができる。“版汚れ”の現象は、感光層中の
酸化亜鉛が充分に不感脂化（親水化）されておらず、従
って、非画線部にもインクが、転写してしまうことによ
って起こると解釈されている。よって、従来は酸化亜鉛
の感光層の保水性を向上させるためには、感光層中の酸
化亜鉛と結着剤との配合比率において、酸化亜鉛の配合
比率を増加することにより不感脂化を強める方法が提案
されてきた。また、感光層中に界面活性剤を添加し、感
光層自体の親水性を向上させるという提案もなされてい
る。In recent years, there has been a strong demand for durability of original plates for printing, but conventional lithographic printing original plates using zinc oxide did not have sufficient durability, especially water retention. When a printing original plate has excellent water retention, so-called "plate staining" is less likely to occur, and as a result, clear printed matter can be obtained. The phenomenon of "plate smudge" is interpreted to occur because the zinc oxide in the photosensitive layer is not sufficiently desensitized (hydrophilicized), and therefore ink is transferred to non-image areas. ing. Therefore, conventionally, in order to improve the water retention of a zinc oxide photosensitive layer, desensitization was strengthened by increasing the blending ratio of zinc oxide and binder in the photosensitive layer. methods have been proposed. It has also been proposed to add a surfactant to the photosensitive layer to improve the hydrophilicity of the photosensitive layer itself.
しかし、これらの方法では保水性は向上するものの、感
光層の版落ち等に代表される物理的強度の大巾な低下や
電子写真特性の低下を招く結果となり問題点を有するも
のである。この様に、従来技術においては他の特性を損
わずに優れた保水性を有する、すなわち耐久性が十分に
得られる平版印刷用原版は得られていなかった。However, although these methods improve water retention, they have problems in that they result in a significant decrease in physical strength, typified by plate removal of the photosensitive layer, and a decrease in electrophotographic properties. As described above, in the prior art, it has not been possible to obtain a lithographic printing original plate that has excellent water retention without impairing other properties, that is, has sufficient durability.
〈発明が解決しようとする課題〉
本発明は上記の事情に鑑み、光導電側として酸化亜鉛を
用いた感光層を設けた平版印刷用原版において、良好な
電子写真特性と物理的強度を維持しながら優れた保水性
を有する耐久性の良好な平版印刷用原版を提供するもの
である。<Problems to be Solved by the Invention> In view of the above circumstances, the present invention provides a planographic printing original plate provided with a photosensitive layer using zinc oxide on the photoconductive side, which maintains good electrophotographic properties and physical strength. However, the present invention provides a lithographic printing original plate having excellent water retention and good durability.
く課題を解決するための手段〉
本発明は、支持体上に光導電側として酸化亜鉛を含有す
る感光層を設けてなる平版印刷用原版において、該感光
層に硫酸カルシウムを含有することを特徴とする平版印
刷用原版である。Means for Solving the Problems The present invention provides a lithographic printing original plate comprising a photosensitive layer containing zinc oxide as a photoconductive side on a support, characterized in that the photosensitive layer contains calcium sulfate. This is an original plate for lithographic printing.
本発明において用いられる硫酸カルシウムは、化学式Ｃ
ａ５Ｏａ・ｎＨ，ｏで示されるものである。ここで、ｎ
＝ｏの無水塩、ｎ ＝ ０．５の０．５水塩、ｎ＝２の
三水塩があるが、特に限定されることなく用いることが
でき、中でも水分子を最も吸着しやすいことから０．５
水塩が特に好適である。感光層中にこれらの硫酸カルシ
ウムを含有することによって、不感脂化及び印刷中にお
いて不感脂化液や湿し水の水分子が感光層に吸着され、
感光層表面が良好な親水性を有し、その結果保水性が向
上するものである。感光層における硫酸カルシウムの配
合割合は、酸化亜鉛に対して０．５〜５０重量％が好ま
しく、特に１〜１０重量％が好ましい。ここで添加量が
、０．５重量％以下では十分な保水性が得られにくく、
また５０重量％以上になると感度、暗減衰等の電子写真
特性の劣化を招く恐れがある。Calcium sulfate used in the present invention has the chemical formula C
It is represented by a5Oa·nH,o. Here, n
There are anhydrous salts with n = o, 0.5 hydrate salts with n = 0.5, and trihydrate salts with n = 2, but they can be used without particular limitation, and among them, the most easily adsorbed water molecules. 0.5
Water salts are particularly preferred. By containing these calcium sulfates in the photosensitive layer, water molecules of desensitizing liquid and dampening solution are adsorbed to the photosensitive layer during desensitizing and printing.
The surface of the photosensitive layer has good hydrophilicity, resulting in improved water retention. The blending ratio of calcium sulfate in the photosensitive layer is preferably 0.5 to 50% by weight, particularly preferably 1 to 10% by weight, based on zinc oxide. If the amount added is less than 0.5% by weight, it is difficult to obtain sufficient water retention.
Moreover, if it exceeds 50% by weight, electrophotographic characteristics such as sensitivity and dark decay may deteriorate.
本発明における感光層は、光導電物質としての酸化亜鉛
、硫酸カルシウムその他必要に応じて増感色素、増感剤
等の各種添加剤を結着剤中に分散させた組成を有するも
のである。感光層に使用される結着剤としては、例えば
アクリル系樹脂、その他のビニル系樹脂、シリコーン樹
脂、ポリエステル樹脂、ポリウレタン樹脂、セルロース
系樹脂、ポリブチラール樹脂、スチレン−ブタジェン共
重合体樹脂、エポキシ樹脂、アルキド樹脂、フ・ン素樹
脂等の使用が可能であり、特に限定されるものではない
、感光層における酸化亜鉛と結着剤の配合比率は、酸化
亜鉛／結着剤＝ｌ／２〜４／１が好ましい。The photosensitive layer in the present invention has a composition in which zinc oxide, calcium sulfate as a photoconductive substance, and various additives such as a sensitizing dye and a sensitizer are dispersed as necessary in a binder. Examples of binders used in the photosensitive layer include acrylic resins, other vinyl resins, silicone resins, polyester resins, polyurethane resins, cellulose resins, polybutyral resins, styrene-butadiene copolymer resins, and epoxy resins. , alkyd resin, fluorine resin, etc. can be used, and there are no particular limitations. The blending ratio of zinc oxide and binder in the photosensitive layer is zinc oxide/binder = l/2 ~ 4/1 is preferred.
また、感光層に必要に応じて用いられる添加剤としては
、トリフェニルメタン系、キサンチン系、シアニン系、
フルオラン系等の増感色素、無水フタル酸、無水マレイ
ン酸等の増感剤等が挙げられる。Additives that may be used in the photosensitive layer as needed include triphenylmethane, xanthine, cyanine,
Examples include sensitizing dyes such as fluoran-based sensitizing dyes, sensitizers such as phthalic anhydride, maleic anhydride, and the like.
本発明における支持体としては、紙、合成紙、各種樹脂
フィルム、不織布、金属箔、金属板およびこれらの複合
体、更に、これらに塗工やラミネートによって耐水性が
付与されているもの、また、これらに導電処理を施した
もの等適宜使用が可能であり、特に限定されるものでは
ない。Supports in the present invention include paper, synthetic paper, various resin films, nonwoven fabrics, metal foils, metal plates, and composites thereof, and those to which water resistance is imparted by coating or laminating. These materials can be used as appropriate, such as those subjected to conductive treatment, and are not particularly limited.
本発明の平版印刷用原版は、支持体上に前記の如き感光
層を設けたものである。感光層を設けるには、前記の結
着剤、酸化亜鉛、硫酸カルシウム、その他添加剤を適当
な溶媒に分散した塗料を、エアナイフコーター、ロール
コータ−、ワイヤーノ＼−コーター、スプレーコーター
、ティップコーター等の従来公知の塗布装置を用いて、
支持体上に塗布・乾燥することによって成される。なお
、感光層を設けるにあたって、感光層塗料の支持体への
浸透を防ぎ、かつ耐水性の向上のために、あらかじめ支
持体上にアンダー層を設けることが好ましい。また耐水
性の向上やカール防止のためにハック層を設けることも
好適である。アンダー層及びバック層は、前記感光層の
結着剤として用いられる樹脂と同様のものを用いること
ができ、公知の塗布方法によって支持体上に設けること
ができる。The lithographic printing original plate of the present invention has a photosensitive layer as described above provided on a support. To form the photosensitive layer, apply a paint containing the binder, zinc oxide, calcium sulfate, and other additives dispersed in an appropriate solvent using an air knife coater, roll coater, wire coater, spray coater, or tip coater. Using a conventionally known coating device such as
This is done by coating it on a support and drying it. In providing the photosensitive layer, it is preferable to provide an under layer on the support in advance in order to prevent the photosensitive layer paint from permeating into the support and to improve water resistance. It is also suitable to provide a hack layer to improve water resistance and prevent curling. The under layer and back layer can be made of the same resin as the binder for the photosensitive layer, and can be provided on the support by a known coating method.
〈実施例〉 次に、実施例により本発明の詳細な説明する。<Example> Next, the present invention will be explained in detail with reference to Examples.
なお、配合を示す部数は全て重量部を表わす。Note that all parts indicating formulations represent parts by weight.
実施例１
支持体として１００ ｇ／ｒｄの上質紙を用い、該支持
体の両面に下記組成よりなる塗料を塗布・乾燥してアン
ダー層及びハック層（各塗布量１０ｇ／ｎ（）を設けた
。Example 1 A 100 g/rd high-quality paper was used as a support, and a paint having the following composition was coated on both sides of the support and dried to form an under layer and a hack layer (each coating amount was 10 g/n ( )). .
［ポリビニルアルコール
１ （分子量１０万、１０％水溶液）
１００部
次に、アンダー層上に下記組成よりなる感光層用塗料を
塗布・乾燥して、厚さ１５μｍの感光層を設けて、本発
明の平版印刷用原版を作製した。[100 parts of polyvinyl alcohol 1 (molecular weight 100,000, 10% aqueous solution) Next, a photosensitive layer paint having the following composition was coated on the under layer and dried to form a photosensitive layer with a thickness of 15 μm. An original plate for lithographic printing was prepared.
実施例３
感光層用塗料として下記組成のものを使用した以外は、
実施例１と全く同様にして本発明の平版印刷用原版を作
製した。Example 3 Except for using the following composition as the coating for the photosensitive layer:
A lithographic printing original plate of the present invention was prepared in exactly the same manner as in Example 1.
実施例２
感光層用塗料として下記組成のものを使用した以外は、
実施例１と全く同様にして本発明の平版印刷用原版を作
製した。Example 2 The following composition was used as the coating for the photosensitive layer.
A lithographic printing original plate of the present invention was prepared in exactly the same manner as in Example 1.
比較例
感光層用塗料として下記組成のものを使用した以外は、
実施例１と全く同様にして比較用の平版印刷用原版を作
製した。Comparative Example Except for using the following composition as the coating for the photosensitive layer:
A comparative lithographic printing original plate was prepared in exactly the same manner as in Example 1.
とが確認された。It was confirmed that
以上の実施例１〜３及び比較例で作製した平版印刷用原
版について、下記の要領にて製版、エツチング及び５０
００枚の連続した印刷テストを行い、版汚れの状態と印
刷物の汚れを目視観察によって評価した。その結果、本
発明による実施例１〜３の平版印刷用原版は印刷の初期
から５０００枚の印刷の過程で全く版汚れが認められず
、優れた保水性が確認された。一方、比較例の平版印刷
用原版ははっきりと版汚れが認められ、印刷物も実用上
問題のあるものであった。なお、本発明による実施例１
〜３の平版印刷用原版による印刷物は良好な画像が得ら
れ、製版すなわち電子写真特性も良好であるのみでなく
連続印刷において版落ちが見られず感光層の表面が十分
な物理的強度を有するこ〈発明の効果〉
本発明の平版印刷用原版は、上記の如き構成を有するの
で良好な電子写真特性と優れた物理的強度を維持すると
共に、保水性が優れているので版汚れを生じにくり、耐
久性が良好であるという効果を有するものである。The planographic printing original plates prepared in Examples 1 to 3 and Comparative Examples above were subjected to plate making, etching and 50% etching in the following manner.
A continuous printing test of 00 sheets was conducted, and the state of plate staining and staining of printed matter was evaluated by visual observation. As a result, the lithographic printing original plates of Examples 1 to 3 according to the present invention showed no plate staining at all from the initial stage of printing to the process of printing 5,000 sheets, and excellent water retention was confirmed. On the other hand, in the lithographic printing original plate of the comparative example, plate staining was clearly observed, and the printed matter was also problematic in practical use. In addition, Example 1 according to the present invention
The printed matter made with the lithographic printing original plate of ~3 not only provides a good image and has good platemaking or electrophotographic properties, but also shows no plate dropping during continuous printing and the surface of the photosensitive layer has sufficient physical strength. <Effects of the Invention> The lithographic printing original plate of the present invention has the above-mentioned structure, so it maintains good electrophotographic properties and excellent physical strength, and has excellent water retention, so it does not cause plate staining. It has the effect of having good durability.
Claims (1)
を設けてなる平版印刷用原版において、該感光層に硫酸
カルシウムを含有することを特徴とする平版印刷用原版
。A lithographic printing original plate comprising a photosensitive layer containing zinc oxide as a photoconductive agent on a support, the photosensitive layer containing calcium sulfate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16276390A JPH0453961A (en) | 1990-06-22 | 1990-06-22 | Original plate for planographic printing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16276390A JPH0453961A (en) | 1990-06-22 | 1990-06-22 | Original plate for planographic printing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0453961A true JPH0453961A (en) | 1992-02-21 |
Family
ID=15760765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16276390A Pending JPH0453961A (en) | 1990-06-22 | 1990-06-22 | Original plate for planographic printing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0453961A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008015428A (en) * | 2006-07-10 | 2008-01-24 | Fuji Xerox Co Ltd | Electrophotographic photoreceptor, image forming apparatus and process cartridge |
-
1990
- 1990-06-22 JP JP16276390A patent/JPH0453961A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008015428A (en) * | 2006-07-10 | 2008-01-24 | Fuji Xerox Co Ltd | Electrophotographic photoreceptor, image forming apparatus and process cartridge |
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