摘要:
An original form for electrophotographic planography includes a paper support having thereon a photoconductive layer including a photoconductive material including at least zinc oxide and a resin binder, the exposure percentage of the zinc oxide on a surface of the photoconductive layer being in the range of from 2.1 to 5%.
摘要:
The present invention aims at, in an electrophotographic lithographic printing plate precursor, improving the construction and composition of back layers and in particular, preventing occurrence of printing scum by rubbing and increasing the number of prints until printing wrinkles occur. The feature of the present invention consists in an electrophotographic lithographic printing plate precursor comprising, at least, a photoconductive layer on one surface of a base and a back layer on the other surface thereof, in which the back layer comprises an outermost layer containing a hydrophilic high molecular material and an innerlayer having a Cobb's water absorbing capacity of at most 25 g/m.sup.2 (45 minute value).
摘要:
An electrophotographic lithographic printing plate precursor capable of well maintaining both the electrophotographic properties and the printing properties is provided, which comprises, at least, a photoconductive layer on one side of a support and an under layer directly under the photoconductive layer, in which the under layer consists of a plurality of layers comprising an outermost layer having a surface resistivity of at most 1.times.10.sup.11 .OMEGA. and an inner layer having a Cobb's water absorbing capacity of at most 15 g/m.sup.2 (45 minute value) or having a Young's Modulus of at most 1000 kg/cm.sup.2.
摘要翻译:提供了能够良好地保持电子照相特性和印刷性能的电子照相平版印刷版原版,其至少包括在载体的一侧上的光电导层和直接在光电导层下的下层,其中下 层包括多个层,其包含具有至多1×10 11欧米茄的表面电阻率的最外层和具有至多15g / m 2(45分钟值)的Cobb吸水能力或至多具有至多杨氏模量的内层 1000 kg / cm2。
摘要:
An liquid developer for electrostatic photography is described, comprising a carrier liquid having an electric resistance of at least 10.sup.9 .OMEGA..multidot.cm and a dielectric constant of not more than 3.5, and a resin dispersed therein, said resin being obtained by polymerizing a monomer, which is soluble in said carrier liquid but becomes insoluble upon being polymerized, in the presence of at least one kind of a soluble dispersion stabilizing resin, said soluble dispersion stabilizing resin being a copolymer containing at least recurring units represented by following formulae (IIIa) and (IIIb) obtained by applying a reaction for introducing an unsaturated bond into a copolymer obtained by polymerizing a monomer represented by formula (I) and a monomer represented by formula (III) ##STR1## wherein in formula (I), V represents --O--, --S--, --CO--, --CO.sub.2 --, --SO.sub.2 --, --OCO--, --CONH--, --CONR'-- (wherein R' represents a hydrocarbon group), --NHCO--, NHCO.sub.2 --, or --NHCONH--; X represents --CO.sub.2 H, --COCl, --OH, --SH, --NH.sub.2, --NCO, or --SO.sub.2 CH.sub.2 CH.sub.2 Cl; W represents a hydrocarbon group linking said atomic group V and said atomic group X directly or through a hetero atom, or W represents a chemical bond; and a.sub.1, a.sub.2, and a.sub.3 each represents a hydrogen atom, a hydrocarbon group, a carboxy group, or a carboxy group through a hydrocarbon group;in formula (II), Y represents --O--, --S--, --CO--, --CO.sub.2 --, --SO.sub.2 --, --OCO--, CONH--, --CONR"-- (wherein R" represents a hydrocarbon group), --NHCO--, --NHCO.sub.2 --, or --NHCONH--; R represents a hydrocarbon group; and b.sub.1, b.sub.2, and b.sub.3 each represents a hydrocarbon atom, a hydrocarbon group, a carboxy group, or a carboxy group through a hydrocarbon group;in formula (IIIa), a.sub.1, a.sub.2, a.sub.3, V, and W have the same meanings as defined for formula (I); X' represents --CO.sub.2 --, --COS--, --SCO--, --CONH--, --OCO--, --NHCO--, --NHCONH--, --SO.sub.2 --, --O--, or --S--; Z represents a hydrocarbon group linking said atomic group X' and unsaturated bond directly or through a hetero atom, or Z represents a chemical bond; the total number of atoms of the main chain portion of atomic group --V--W--X'--Z-- must, however, be at least 9; and d.sub.1, d.sub.2, and d.sub.3 each represents a hydrocarbon atom, a hydrocarbon group, a carboxy group, or a carboxy group through a hydrocarbon group; andin formula (IIIb), b.sub.1, b.sub.2, b.sub.3, Y, and R have the same meanings as defined for formula (II).
摘要:
A liquid developer for electrostatic photography is described, comprising at least a resin dispersed in a non-aqueous solvent having an electric resistance of at least 10.sup.9 ohms.cm and a dielectric constant of not more than 3.5. The resin is a copolymer resin obtained by polymerizing a solution containing at least one monofunctional monomer (A) which is soluble in the non-aqueous solvent but becomes insoluble upon polymerization and at least one specified monomer (B) containing an aliphatic group having at least 8 carbon atoms and being copolymerizable with the monomer (A), in the presense of a resin not containing a grafting group polymerizable with the monomers and being soluble in the non-aqueous solvent. The resin may be colored by dissolving at least one organic dye in the dispersion of the resin and heating the mixture. The developer has excellent dispersion stability, redispersibility, fixability and preservability.
摘要:
Disclosed is a liquid electrophotographic developer comprising a resin prepared by polymerizing selected monomers to provide a developer composition having good storage stability and redispersibility.
摘要:
A liquid developer for electrostatic photography comprising a carrier medium having an electrical resistivity of not less than 10.sup.9 106.cm and a dielectric constant of not more than 3.5 having dispersed therein at least a resin, wherein said resin is a copolymer resin obtained by copolymerizing (1) a solution containing at least one copolymer having an unsaturated bond obtained by copolymerizing at least one monomer (A) represented by formula (I) shown below and at least one monomer (B) represented by formula (II) shown below, and reacting the resulting copolymer with at least one monomer (C) represented by formula (III) shown below, (2) at least one monomer (D) which is soluble in the carrier medium but becomes insoluble upon polymerization, and (3) at least one monomer (E) represented by formula (IV) shown below to obtained a resin dispersion: ##STR1## wherein a.sub.1, a.sub.2 a.sub.3, b.sub.1, b.sub.2, b.sub.3, d.sub.1, d.sub.2, d.sub.3, e.sub.1, e.sub.2, e.sub.3, X, Y, V, Z, L, F, Q, G, R.sub.1, R.sub.2, R.sub.3, T.sub.1, T.sub.2, U, m and n are defined in the specification. The developer is excellent in redispersibility, preservability, stability, image reproducibility, and fixing properties and is capable of producing a master plate for offset printing having excellent printing durability.
摘要:
A liquid electrophotographic development method where electrodes are arranged only on the side of the photosensitive layer of a master, developing liquid is supplied between the master and the electrodes, and conductors are made to come into contact with the base of the master so that an electric field is generated between the photosensitive plane and the electrodes for development. The electrode to be used for the electrophotographic development method includes conductive wires of a plural number which are arranged in the direction perpendicular to the traveling direction of the material so as to come into contact with the conductive base thereof. If the electrodes are utilized, a main electrode needs to be arranged only on the side of the photosensitive layer of the master, and developing liquid is supplied therebetween. The electrode is adapted to come into contact with the conductive base of the master, to thereby generate an electric field between the main electrode and the electrode. Therefore, the master can be directly injected with electrons instead of indirect injection, and adhesion of toner scum which often was caused in the prior art can be avoided. This further eliminates the trouble of cleaning the electrodes to improve maintenance.
摘要:
A block copy material for a lithographic printing plate material comprising a sheet-like substrate, on at least one side of which a plurality of minute projections are distributively formed, or a lithographic press having a plate cylinder, on a surface of which a plurality of minute projections are distributively formed, wherein the density of minute projections having a height of more than 40 &mgr;m is 20 projections/cm2 or less on surface average, and the density of minute projections having a height of 3 &mgr;m or more is 25 projections/cm2 or more on surface average. The block copy material for a lithographic printing plate material, the lithographic press and a lithographic printing method using the block copy material or the lithographic press can avoid the deterioration of the printing dimension and printing accuracy caused by strain partially developed in printing, and can solve the problem of conventional methods, the deterioration of the workability in printing.
摘要翻译:一种用于平版印刷版材料的块复制材料,其包括片状基底,其至少一侧上分布有多个微小凸起,或具有印版滚筒的平版印刷机,其表面上具有多个 分布形成微小突起,其中高度大于40μm的微小突起的密度在表面平均上为20个突起/ cm 2以下,高度为3μm以上的微小突起的密度为25个突起/ cm 2 或更多表面平均值。 用于平版印刷版材料的平版印刷材料,平版印刷机和使用块复制材料或平版印刷机的平版印刷方法可以避免印刷中部分显影的应变引起的印刷尺寸和印刷精度的劣化,并且可以解决 传统方法的问题,打印作业性的恶化。
摘要:
A plate making apparatus of a flexible plate material 13, 22 being placed on a plate cylinder 7 for executing planographic printing in multiple colors. The plate making apparatus has a cutter 23 being placed between a storage section 21 of a roll-like plate material and an exposure section 25 for cutting the roll-like plate material like a sheet and punch means 30 for making plate cylinder engagement holes 14a and 14b in the left and right margins of the plate material along the transport direction thereof, the plate cylinder engagement holes to be engaged in protrusions 7a an 7b disposed in the circumferential direction of the left and right margins of the plate cylinder. Accordingly, it is possible to provide a plate making apparatus which reliably holds a plate material on a plate cylinder for enabling planographic printing and can use a roll-like plate material.