JPH038538B2 - - Google Patents
Info
- Publication number
- JPH038538B2 JPH038538B2 JP56070990A JP7099081A JPH038538B2 JP H038538 B2 JPH038538 B2 JP H038538B2 JP 56070990 A JP56070990 A JP 56070990A JP 7099081 A JP7099081 A JP 7099081A JP H038538 B2 JPH038538 B2 JP H038538B2
- Authority
- JP
- Japan
- Prior art keywords
- dispersion
- seconds
- smoothness
- photosensitive layer
- layer
- 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.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording-members for original recording by exposure, e.g. to light, to heat or to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/10—Bases for charge-receiving or other layers
- G03G5/101—Paper bases
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording-members for original recording by exposure, e.g. to light, to heat or to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/02—Charge-receiving layers
- G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
- G03G5/05—Organic bonding materials; Methods for coating a substrate with a photoconductive layer; Inert supplements for use in photoconductive layers
- G03G5/0528—Macromolecular bonding materials
- G03G5/0592—Macromolecular compounds characterised by their structure or by their chemical properties, e.g. block polymers, reticulated polymers, molecular weight, acidity
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording-members for original recording by exposure, e.g. to light, to heat or to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/14—Inert intermediate or cover layers for charge-receiving layers
- G03G5/142—Inert intermediate layers
- G03G5/144—Inert intermediate layers comprising inorganic material
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Printing Plates And Materials Therefor (AREA)
- Photoreceptors In Electrophotography (AREA)
Description
本発明は、粒状性光導電性物質を含む電子写真
感光層形成用分散液に関し、特に電子写真平版印
刷材料を製造するのに適した感光層形成用分散液
およびその製造方法に関する。
電子写真感光材料は、導電性支持体の表面に酸
化亜鉛などの粒状性光導電性物質、結着剤樹脂お
よび有機溶媒を少なくとも含む感光層形成用分散
液を塗布し、乾燥して製造されている。感光層上
に画像を形成せしめてオフセツト印刷の版として
使用することは、その製版操作が簡便、迅速であ
り、また安価であることから軽印刷の分野に於て
広く普及している。
電子写真平版印刷材料は、感度、調子、濃度、
カブリなどの一般の電子写真複写材料としての諸
特性の他に平版印刷材料としての性質、例えば耐
水性（印刷中の湿し水などによる伸びの防止）、
接着性（印刷中の感光層の膜剥れ）、インキのり
性、耐刷力などが優れていることが要求される。
本発明の目的は、上記したような電子写真特性
の改良された電子写真感光材料、特にその感光層
形成用分散液を提供することにある。
本発明の別の目的は、上記したような電子写真
特性の改良に加えて印刷特性の改良された電子写
真平版印刷材料、特にその感光層形成用分散液を
提供することにある。
一般に酸化亜鉛のような粒状性光導電性物質−
結着剤樹脂分散系層の被塗布物への接着は、粒状
性物質と結着剤樹脂との混合比に大きく左右さ
れ、樹脂比の高い方がより強固な接着を示すこと
が知られている。優れた接着力は平版印刷中の湿
し水等の影響にも拘らず感光層の剥離を防止する
ことができるから望ましいことである。しかし、
光導電性を示す酸化亜鉛のような粒子が相互に接
触点を持つことなく、高絶縁性樹脂中に完全に離
れ離れとなつて分散した状態では十分な電子写真
特性を発揮できないために樹脂比を極端に高くす
ることは困難である。従つて、通常は光導電性粒
子100重量部に対して10〜40重量部の範囲くらい
で使用される。
一般に光導電性粒子に対する樹脂比を小さくす
る程高感度が得られ望ましいけれども、やはり感
光層の接着性を悪化することになる。さらに光導
電性粒子に対する樹脂比を小さくするに従つて、
高湿度条件下での濃度の低下あるいはインキのり
性の低下を招く欠点を有している。
即ち、前述した如き諸特性は、通常１つの解決
手段では一挙に解決できない相矛盾した要求の上
に成立つていることを物語つている。
本発明者等は、前述した如き諸特性の殆んど或
いは全部がある特別の性質を持つた感光層形成用
分散液を用いることによつて満足されるという驚
くべき事実を見出した。
本発明の感光層形成用分散液は、少なくとも酸
化亜鉛などの粒状性光導電性物質、結着剤樹脂お
よび溶媒を含む分散液であつて、該分散液はベツ
ク平滑度が実質的に無限大値の平滑な表面物体に
被覆したとき、その表面のベツク平滑度が約1000
秒乃至4000秒の範囲の値を示すものであることに
よつて特徴づけられる。
上記試験法は、フイルムあるいは金属板（例え
ばアルミニウム板）の如き表面が極めて平滑な物
体、即ちベツク平滑度（JIS−P8119による）が
数万秒あるいは数十万秒のように実質的に無限大
値を示す物体表面に通常の方法で塗布し、その塗
布物表面のベツク平滑度（JIS−P8119による）
を測定することによつて容易に実施することがで
きる。
本発明の感光層形成用分散液は、酸化亜鉛など
の粒状性光導電性物質、結着剤樹脂および有機溶
媒さらには増感色素あるいはルイス酸の如き増感
剤などを混合し、ボールミル、ロールミル、サン
ドミル、ホモミキサー、ホモジナイザー、超音波
振動機などで撹拌、分散する従来の調製法と同様
にして調製することができる。
本発明の感光層形成用分散液の特別の性質は、
従来法による分散の程度に比べて相当に分散度を
強くすることによつて、しかし過度の分散度合に
ならないように留意することによつて付与され
る。その分散の度合は、前記したベツク平滑度の
測定による試験法によつて明確に規定することが
できることが判明した。
前記の試験法において、ベツク平滑度が約4000
秒を越えると、減感、軟調化、濃度低下などの欠
点が生じ、約1000秒以下、通常約600秒以下の従
来法によるときは、低い濃度、特に高湿度条件下
での濃度低下、インキ乗り不良、感光層の接着不
良などの欠点が生じる。
電子写真感光材料、殊に電子写真平版印刷材料
には通常は紙支持体が広く用いられ、感光層の平
滑性および耐水性、耐溶剤性を良くするために紙
基体と感光層との間に所謂プレコート層が設けら
れ、該プレコート層は、更にスーパーカレンダー
処理などが施こされることはよく知られている。
しかし、このようなプレコート層の平滑性を極
めて高いものにする従来法においては、従来法に
より調製した感光層形成用分散液を塗布しただけ
では、その塗布物表面の平滑性には自ずと限界が
ある。実際に市販されている各種の電子写真平版
印刷材料（プレコート層を持つ紙支持体）でも、
精々300秒前後までのベツク平滑度しか有してい
ない。
本発明は、プレコート層の平滑性アツプに基づ
く感光層の平滑性アツプよりもより平滑にするこ
とができ、かつ電子写真特性および印刷特性に卓
越した利点を与えることができる。
本発明の感光層形成用分散液は、粒状性光導電
性物質に対する結着剤樹脂の重量比を可能な限り
小さくすることができるため高感度であり、それ
にも拘らず高湿度条件下での濃度低下もなく、低
湿度条件下でのカブリもなく、かつ感光層の接着
性、インキ乗り性および耐刷力がより改良された
電子写真感光材料ならびに電子写真平版印刷材料
を製造することができる。
前述の試験法に合格する本発明の感光層形成用
分散液は、塗布する支持体の違いによつて自ずと
そのベツク平滑度は異なる。一具体例によれば、
前述の試験法で約1000秒乃至約4000秒の平滑度を
与える分散液は、紙支持体表面のポリマーから成
るプレコート層上に塗布した場合、通常約500秒
乃至約1500秒のベツク平滑度を与える。従つて、
約500秒以下または約1500秒以上では既述した如
き欠点を生じることになる。
本発明によれば、紙基体上にプレコート層を介
して光導電層を有し、光導電層表面のベツク平滑
度が約600秒乃至約1300秒である改良された電子
写真平版印刷材料が提供される。
本発明は、前記したような分散方法によつて、
従来法の分散程度よりも相当に分散時間を長くす
るとか分散強度を強めるとかにより、しかしそれ
も余り過度に行なわないある特定の範囲の分散程
度とすることによつて可能になるという予想外の
事実の発見に基づく。この特定の範囲の分散度を
有する感光層形成用分散液が相矛盾することの多
い電子写真特性および印刷特性の全て或いは殆ん
どを極めて良好ならしめることは、従来の分散技
術の知見からは予期しえないことであつた。前記
試験法に合格する分散液を得るには、分散法によ
つても異なるが、既述した紙支持体の平版印刷材
料で精々300秒までのベツク平滑度を得るために
行なつていた分散度を数倍（時間あるいは強度と
して）、一般には３〜６倍程度強化することによ
つて可能とすることができる。
本発明の感光層形成用分散液は、酸化亜鉛、硫
化亜鉛、硫化カドミウム顔料などの光導電性粒子
100重量部に対して結着剤樹脂10〜40重量部、好
ましくは10〜30重量部の割合で含むことが好まし
い。
結着剤樹脂は、アクリル樹脂、シリコン樹脂、
アルキツド樹脂など従来から知られているものも
任意に用いることができる。溶媒はトルエン、キ
シレンなど従来知られているものが任意に用いら
れる。
本発明の感光層形成用分散液は、紙基体上に設
けられたプレコート層上に塗布することによつて
電子写真平版印刷材料とすることができ、そのプ
レコート層は特公昭40−18708、同昭45−10272、
同昭47−23594、同昭47−37451、特開昭48−9803
などに記載のような耐水性あるいは耐有機溶剤性
の任意のポリマー層であることができ、感光層の
平滑性を上げるためにカオリンクレーなどの顔料
などを含むこともできる。
以下に電子写真平版印刷材料を例に挙げて本発
明を説明する。
実施例 １
下記処方の感光層形成用組成液を準備する。
酸化亜鉛 200重量部
アクリル系樹脂（50％液） 80 〃
ローズベンガル（１％液） 15重量部
キシレン 250 〃
これをボールミルを用いて１昼夜（16時間）、
２昼夜（40時間）、３昼夜（64時間）および４昼
夜（88時間）分散し、厚み100μのポリエステル
フイルム上に20ｇ／m2（固形）となるように塗布
乾燥する。順次、塗液１，２，３および４とし、
それぞれのペツク平滑度を測定した結果を下記表
にしている。
The present invention relates to a dispersion for forming an electrophotographic photosensitive layer containing a particulate photoconductive substance, and particularly to a dispersion for forming a photosensitive layer suitable for producing an electrophotographic lithographic printing material and a method for producing the same. Electrophotographic light-sensitive materials are produced by coating the surface of a conductive support with a photosensitive layer-forming dispersion containing at least a particulate photoconductive substance such as zinc oxide, a binder resin, and an organic solvent, and drying the dispersion. There is. Forming an image on a photosensitive layer and using it as a plate for offset printing is widely used in the field of light printing because the plate-making operation is simple, quick, and inexpensive. Electrophotographic lithographic printing materials are characterized by sensitivity, tone, density,
In addition to various properties as a general electrophotographic copying material such as fog, properties as a lithographic printing material, such as water resistance (prevention of stretching due to dampening water etc. during printing),
It is required to have excellent adhesion (peeling of the photosensitive layer during printing), ink adhesion, printing durability, etc. An object of the present invention is to provide an electrophotographic light-sensitive material with improved electrophotographic properties as described above, particularly a dispersion thereof for forming a light-sensitive layer. Another object of the present invention is to provide an electrophotographic lithographic printing material, particularly a dispersion for forming a photosensitive layer thereof, which has improved printing properties in addition to the above-mentioned improvements in electrophotographic properties. Generally particulate photoconductive materials such as zinc oxide
It is known that the adhesion of the binder resin dispersion layer to the coated object is largely influenced by the mixing ratio of the particulate material and the binder resin, and it is known that the higher the resin ratio, the stronger the adhesion. There is. Excellent adhesion is desirable because it can prevent the photosensitive layer from peeling off despite the influence of dampening water and the like during lithographic printing. but,
Particles such as zinc oxide, which exhibit photoconductivity, cannot exhibit sufficient electrophotographic properties when they are completely separated and dispersed in a highly insulating resin without having contact points with each other. It is difficult to make it extremely high. Therefore, it is usually used in an amount of about 10 to 40 parts by weight per 100 parts by weight of the photoconductive particles. Although it is generally desirable to obtain higher sensitivity as the ratio of resin to photoconductive particles is reduced, the adhesion of the photosensitive layer is also deteriorated. Furthermore, as the ratio of resin to photoconductive particles is reduced,
It has the disadvantage of causing a decrease in density or ink adhesion under high humidity conditions. In other words, the various characteristics described above are based on contradictory demands that cannot be solved all at once by a single solution. The present inventors have discovered the surprising fact that most or all of the above-mentioned properties can be satisfied by using a photosensitive layer-forming dispersion having certain special properties. The dispersion liquid for forming a photosensitive layer of the present invention is a dispersion liquid containing at least a particulate photoconductive substance such as zinc oxide, a binder resin, and a solvent, and the dispersion liquid has a substantially infinite Beck smoothness. When coated on an object with a smooth surface of
It is characterized by exhibiting values ranging from seconds to 4000 seconds. The above test method is applicable to objects with extremely smooth surfaces such as films or metal plates (e.g. aluminum plates), which have a Beck's smoothness (according to JIS-P8119) of tens of thousands or hundreds of thousands of seconds, which is virtually infinite. The base smoothness of the surface of the applied object (according to JIS-P8119)
This can be easily carried out by measuring. The dispersion for forming a photosensitive layer of the present invention is prepared by mixing a particulate photoconductive substance such as zinc oxide, a binder resin, an organic solvent, and a sensitizer such as a sensitizing dye or a Lewis acid, and then milling it by ball milling or roll milling. , a sand mill, a homomixer, a homogenizer, an ultrasonic vibrator, etc., and can be prepared in the same manner as the conventional preparation method of stirring and dispersing. The special properties of the photosensitive layer forming dispersion of the present invention are as follows:
This is achieved by increasing the degree of dispersion considerably compared to the degree of dispersion achieved by conventional methods, but by being careful not to create an excessive degree of dispersion. It has been found that the degree of dispersion can be clearly defined by the above-mentioned test method based on the measurement of Beck smoothness. In the above test method, the Beck smoothness was approximately 4000.
If the time exceeds 2 seconds, disadvantages such as desensitization, softening, and decrease in density will occur.If the conventional method is used for less than about 1000 seconds, usually about 600 seconds or less, it will cause problems such as decrease in density, especially under high humidity conditions. There are drawbacks such as poor riding and poor adhesion of the photosensitive layer. Paper supports are commonly used in electrophotographic materials, especially electrophotographic lithographic materials, and in order to improve the smoothness, water resistance, and solvent resistance of the photosensitive layer, there is a layer between the paper substrate and the photosensitive layer. It is well known that a so-called precoat layer is provided, and the precoat layer is further subjected to a supercalender treatment or the like. However, in the conventional method of achieving extremely high smoothness of such a precoat layer, there is a limit to the smoothness of the surface of the coated material simply by applying a dispersion for forming a photosensitive layer prepared by the conventional method. be. Even with various electrophotographic lithographic printing materials (paper supports with precoat layers) that are actually commercially available,
It only has a Beck smoothness of around 300 seconds at most. The present invention can make the photosensitive layer smoother than the smoothness of the photosensitive layer based on the increased smoothness of the precoat layer, and can provide outstanding advantages in electrophotographic properties and printing properties. The dispersion liquid for forming a photosensitive layer of the present invention has high sensitivity because the weight ratio of the binder resin to the particulate photoconductive substance can be made as small as possible. It is possible to produce an electrophotographic light-sensitive material and an electrophotographic lithographic printing material that have no decrease in density, no fogging under low humidity conditions, and have improved adhesion, ink transferability, and printing durability of the photosensitive layer. . The dispersion liquid for forming a photosensitive layer of the present invention that passes the above-mentioned test method naturally has different base smoothness depending on the support to which it is applied. According to one specific example,
A dispersion that gives a smoothness of about 1000 seconds to about 4000 seconds according to the test method described above will usually give a Bec. give. Therefore,
If the time is less than about 500 seconds or more than about 1500 seconds, the above-mentioned drawbacks will occur. According to the present invention, there is provided an improved electrophotographic lithographic printing material which has a photoconductive layer on a paper substrate via a precoat layer and has a surface smoothness of about 600 seconds to about 1300 seconds. be done. According to the present invention, by the dispersion method as described above,
An unexpected result is that it becomes possible by lengthening the dispersion time or increasing the dispersion strength considerably compared to the degree of dispersion in conventional methods, but by setting the degree of dispersion within a certain range without going too far. Based on factual findings. From the knowledge of conventional dispersion technology, it is clear that a dispersion for forming a photosensitive layer having a dispersion degree in this specific range has extremely good all or most of the electrophotographic properties and printing properties, which are often contradictory. It was something unexpected. In order to obtain a dispersion that passes the above test method, although it varies depending on the dispersion method, the dispersion that was carried out in order to obtain a Betzk smoothness of up to 300 seconds at most with the lithographic printing material of the paper support mentioned above is necessary. This can be achieved by increasing the strength several times (in terms of time or intensity), generally by about 3 to 6 times. The photosensitive layer forming dispersion of the present invention comprises photoconductive particles such as zinc oxide, zinc sulfide, and cadmium sulfide pigments.
The binder resin is preferably contained in an amount of 10 to 40 parts by weight, preferably 10 to 30 parts by weight, per 100 parts by weight. Binder resins include acrylic resin, silicone resin,
Conventionally known materials such as alkyd resins can also be used arbitrarily. Any conventionally known solvent such as toluene and xylene can be used as the solvent. The dispersion liquid for forming a photosensitive layer of the present invention can be made into an electrophotographic lithographic printing material by coating it on a precoat layer provided on a paper substrate, and the precoat layer is coated in Japanese Patent Publication No. 40-18708, Showa 45-10272,
1972-23594, 1977-37451, JP 48-9803
The photosensitive layer may be any water-resistant or organic solvent-resistant polymer layer as described in , et al., and may also contain a pigment such as kaolin clay in order to improve the smoothness of the photosensitive layer. The present invention will be explained below using an electrophotographic lithographic printing material as an example. Example 1 A composition solution for forming a photosensitive layer having the following formulation is prepared. Zinc oxide 200 parts by weight Acrylic resin (50% liquid) 80 Rose Bengal (1% liquid) 15 parts by weight
The mixture was dispersed for 2 days and nights (40 hours), 3 days and nights (64 hours), and 4 days and nights (88 hours), coated and dried on a polyester film with a thickness of 100 μm to a weight of 20 g/m 2 (solid). Sequentially, coating liquids 1, 2, 3 and 4,
The results of measuring each peck smoothness are shown in the table below.
【表】
Ｎ材パルプを主体とした紙基体の表側に下記組
成のプレコート層形成用塗布液を乾燥塗布量が９
ｇ／m2となるように塗布、乾燥し、そのプレコー
ト層表面をスーパーカレンダーにかける。
〈プレコート層形成用塗布液〉
カオリンクレー（50％水分散液） 200重量部
微粒状ポリスチレン（平均粒径0.5μ、48.5％
水分散液） 150重量部
ポリビニルアルコール（10％水溶液）
150 〃
SBRラテツクス（固形分50％） 150 〃
次いで、紙基体の裏側に下記組成の導電層形成
用塗布液を乾燥塗布量が13ｇ／m2となるように塗
布、乾燥する。
〈導電層形成用塗布液〉
カオリンクレー（50％水分散液） 600重量部
ポリビニルアルコール（10％水溶液）
200 〃
SBRラテツクス（固形分50％） 450 〃
ポリビニルベンジルトリメチルアンモニウム
クロライド（固形分30％） 200 〃
前記の塗液１，２，３および４をプレコート層
上に同様に塗布、乾燥して平版印刷プレート１，
２，３および４を作製した。その感光層表面のベ
ツク平滑度を下記第１表に示している。[Table] A coating solution for forming a pre-coat layer with the following composition was applied on the front side of a paper substrate mainly made of N pulp with a dry coating amount of 9.
g/m 2 , dried, and the surface of the precoat layer was supercalendered. <Coating liquid for pre-coat layer formation> Kaolin clay (50% aqueous dispersion) 200 parts by weight Finely divided polystyrene (average particle size 0.5μ, 48.5%
aqueous dispersion) 150 parts by weight polyvinyl alcohol (10% aqueous solution)
150 〃 SBR latex (solid content 50%) 150 〃 Next, a coating liquid for forming a conductive layer having the following composition is applied to the back side of the paper base so that the dry coating amount is 13 g/m 2 and dried. <Coating liquid for forming conductive layer> Kaolin clay (50% aqueous dispersion) 600 parts by weight Polyvinyl alcohol (10% aqueous solution)
200 〃 SBR latex (solid content 50%) 450 〃 Polyvinylbenzyltrimethylammonium chloride (solid content 30%) 200 〃 Coating liquids 1, 2, 3, and 4 described above were similarly applied on the precoat layer, dried, and lithographically printed. plate 1,
2, 3 and 4 were produced. The surface smoothness of the photosensitive layer is shown in Table 1 below.
【表】
これらのプレートを20℃、相対湿度90％の条件
下で電子写真製版機ダイヤフアツクスEP−11（三
菱製紙(株)製、液体現像用製版機）で製版し、電子
写真平版マスター用エツチ液ダイヤフアツクス
LOM−OH（三菱製紙(株)製）で不感脂化処理を施
し、印刷機トーコーModel810（東京航空計器(株)
製）で印刷した。各プレートの感光層上に於る最
大濃度および相対感度を第２表に示している。[Table] These plates were made using an electrophotographic plate making machine Diafax EP-11 (manufactured by Mitsubishi Paper Industries, Ltd., liquid development plate making machine) under conditions of 20°C and 90% relative humidity, and an electrophotographic lithography master was used. Etch liquid diaphragm
Desensitized with LOM-OH (Mitsubishi Paper Mills Co., Ltd.), printing machine Toko Model 810 (Tokyo Aircraft Instrument Co., Ltd.)
Printed by Manufacturer). The maximum density and relative sensitivity on the photosensitive layer of each plate are shown in Table 2.
【表】
第２表の結果は、本発明の感光層形成用分散液
を用いたプレート２および３は、高湿度条件下で
も十分に高い濃度を有しており、感度の低下も極
めて小さいことを示している。プレート４は減感
が大きく、かつ軟調な特性しか得られなかつた。
これらのプレートを印刷した結果、プレート２
および３はプレート１に比べてはるかにインキ乗
り性が良好でかつ5000枚以上の印刷でも感光層の
膜剥れも生じず鮮明な印刷物を得ることができた
が、プレート１は3000枚程度で膜剥れが生じてし
まつた。尚、プレート１は、各社メーカーの市販
している数種の平版印刷プレートとほぼ同程度の
表面平滑度を有するものである。
実施例 ２
下記の感光層形成用分散液を用いる以外は、実
施例１を繰返した。但し、分散は超音波分散機を
用いて激しく分散しながら平滑度の異なるものを
調製した。
酸化亜鉛 200重量部
アルキツド樹脂（50％） 60 〃
ローズベンガル（１％） 15 〃
キシレン 300 〃
以後、実施例１と同様に試験したところ同様な
結果が得られた。プレートの平滑度、25℃、80％
RHでの濃度および相対感度を第３表にまとめて
いる。[Table] The results in Table 2 show that Plates 2 and 3 using the photosensitive layer forming dispersion of the present invention have sufficiently high concentrations even under high humidity conditions, and the decrease in sensitivity is extremely small. It shows. Plate 4 had a large desensitization and could only provide soft characteristics. As a result of printing these plates, plate 2
Plate 1 and Plate 3 had much better ink adhesion than Plate 1, and were able to obtain clear prints without peeling of the photosensitive layer even after printing on more than 5000 sheets, but Plate 1 only printed on about 3000 sheets. Film peeling occurred. Incidentally, the plate 1 has a surface smoothness that is approximately the same as that of several types of planographic printing plates commercially available from various manufacturers. Example 2 Example 1 was repeated except that the following dispersion for forming a photosensitive layer was used. However, the dispersion was performed using an ultrasonic dispersion machine, and while vigorously dispersing the particles, samples with different degrees of smoothness were prepared. Zinc oxide 200 parts by weight Alkyd resin (50%) 60 Rose Bengal (1%) 15 Xylene 300 Thereafter, tests were conducted in the same manner as in Example 1, and the same results were obtained. Plate smoothness, 25℃, 80%
Concentrations and relative sensitivities at RH are summarized in Table 3.
【表】
プレート２，３および４は、前記試験法に合格
する本発明の感光層形成用分散液であつた。[Table] Plates 2, 3 and 4 were dispersions for forming a photosensitive layer of the present invention that passed the above test method.
Claims (1)
および溶媒を含む分散液であつて、該分散液は実
質的に無限大値のベツク平滑度を有する物体表面
に被覆したとき、その表面のベツク平滑度が約
1000秒乃至約4000秒の値になるように分散度を制
御されたものであることを特徴とする電子写真感
光層形成用分散液。 ２ 導電性紙支持体上にプレコート層を介して光
導電性層を有する電子写真平版印刷材料であつ
て、該光導電性層は少なくとも粒状性光導電性物
質および結着剤樹脂および溶媒を含み、実質的に
無限大値のベツク平滑度を有する物体表面に被覆
したとき、その表面のベツク平滑度が約1000秒乃
至約4000秒の値になるように分散度を制御された
分散液を塗布することにより設けられたものであ
り、その表面のベツク平滑度が600秒乃至約1300
秒の範囲であることを特徴とする電子写真平版印
刷材料。 ３ 無機粒状光導電性物質100重量部に対して結
着剤樹脂10〜40重量部である特許請求の範囲第２
項記載の電子写真平版印刷材料。[Scope of Claims] 1. A dispersion containing at least a particulate photoconductive material, a binder resin, and a solvent, which the dispersion is coated on the surface of an object having a substantially infinite Becs smoothness. When the Beck smoothness of the surface is approximately
1. A dispersion liquid for forming an electrophotographic photosensitive layer, characterized in that the degree of dispersion is controlled to have a value of 1000 seconds to about 4000 seconds. 2. An electrophotographic lithographic printing material having a photoconductive layer on a conductive paper support via a precoat layer, the photoconductive layer containing at least a particulate photoconductive substance, a binder resin, and a solvent. Applying a dispersion liquid whose degree of dispersion is controlled so that when coated on the surface of an object having a Beck's smoothness of substantially infinite value, the Beck's smoothness of the surface becomes a value of about 1000 seconds to about 4000 seconds. The base smoothness of the surface is 600 seconds to about 1300 seconds.
An electrophotographic lithographic printing material characterized in that in the range of seconds. 3. Claim 2 in which the binder resin is 10 to 40 parts by weight per 100 parts by weight of the inorganic particulate photoconductive material.
The electrophotographic lithographic printing material described in Section 1.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7099081A JPS57185441A (en) | 1981-05-12 | 1981-05-12 | Dispersion for formation of electrophotographic receptor |
| US06/354,799 US4427754A (en) | 1981-03-10 | 1982-03-04 | Electrophotographic lithographic printing plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7099081A JPS57185441A (en) | 1981-05-12 | 1981-05-12 | Dispersion for formation of electrophotographic receptor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57185441A JPS57185441A (en) | 1982-11-15 |
| JPH038538B2 true JPH038538B2 (en) | 1991-02-06 |
Family
ID=13447480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7099081A Granted JPS57185441A (en) | 1981-03-10 | 1981-05-12 | Dispersion for formation of electrophotographic receptor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57185441A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3686374T2 (en) * | 1985-08-09 | 1993-02-25 | Xerox Corp | COMPOSITIONS OF ENCAPSED COLORED TONERS. |
| JPS62288080A (en) * | 1986-06-06 | 1987-12-14 | Mitsubishi Paper Mills Ltd | thermal transfer ink film |
| JPS63301953A (en) * | 1987-06-01 | 1988-12-08 | Canon Inc | Manufacture of electrophotographic sensitive body |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5644690A (en) * | 1979-09-20 | 1981-04-23 | Ricoh Co Ltd | Original form for offset printing |
-
1981
- 1981-05-12 JP JP7099081A patent/JPS57185441A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57185441A (en) | 1982-11-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE3889566T2 (en) | Electrophotographic photosensitive material. | |
| US4427754A (en) | Electrophotographic lithographic printing plate | |
| JPH038538B2 (en) | ||
| JPH038537B2 (en) | ||
| GB1603277A (en) | Electrophotographic materials | |
| JPH01114861A (en) | Master plate for electrophotographic planographic printing | |
| US4520089A (en) | Electrophotographic offset masters | |
| US4357404A (en) | Process for forming a lithographic printing plate by electrophotography | |
| JPH0261654A (en) | Electrophotographic printing plate | |
| US5932381A (en) | Electrophotographic lithographic printing plate | |
| JP2667036B2 (en) | Electrophotographic lithographic printing plate material for laser light | |
| JPS62286064A (en) | Electrophotographic lithographic plate material | |
| US5612156A (en) | Electrophotographic photosensitive element and a process for manufacturing an offset printing master from the element | |
| JPH083638B2 (en) | Electrophotographic photoreceptor | |
| JPS597388B2 (en) | Electrophotographic transfer sheet | |
| JPS63217354A (en) | Electrophotographic sensitive body | |
| JPS60159749A (en) | Manufacture of electrophotographic master | |
| JPH0268563A (en) | Electrophotographic sensitive body | |
| JPS6237194A (en) | Original plate for lithographic printing | |
| JPH10268583A (en) | Image accepting layer used for non-impact printing | |
| JPS581773B2 (en) | Denshisha Shinkankoutai | |
| JPS62210476A (en) | Electrophotographic lithographic plate material | |
| JPS6287970A (en) | electrophotographic photoreceptor | |
| JPH01211766A (en) | Electrophotographic sensitive body | |
| JPH09138514A (en) | Electrophotographic lithographic printing plate material for laser light |