Abstract:
A positive planographic printing plate precursor includes a support having disposed thereon a lower thermosensitive layer containing a water-insoluble but alkali-soluble polymer compound and an upper thermosensitive layer containing a water-insoluble but alkali-soluble polymer compound, with alkali-solubility increasing under heat, wherein (i) both the upper thermosensitive layer and the lower thermosensitive layer contain an IR absorbing dye, with the ratio of the IR absorbing dye concentration in the upper thermosensitive layer to the IR absorbing dye concentration in the lower thermosensitive layer is 1.6 to 10.0, and/or (ii) the upper thermosensitive layer and the lower thermosensitive layer contain different IR absorbing dyes, and/or (iii) at least one of the upper thermosensitive layer and the lower thermosensitive layer contains an IR absorbent having, in one molecule, at least two chromophoric groups that absorb IR light, with the chromophoric groups bonding to each other via a covalent bond.
Abstract:
A positive planographic printing plate precursor includes a support having disposed thereon a lower thermosensitive layer containing a water-insoluble but alkali-soluble polymer compound and an upper thermosensitive layer containing a water-insoluble but alkali-soluble polymer compound, with alkali-solubility increasing under heat, wherein (i) both the upper thermosensitive layer and the lower thermosensitive layer contain an IR absorbing dye, with the ratio of the IR absorbing dye concentration in the upper thermosensitive layer to the IR absorbing dye concentration in the lower thermosensitive layer is 1.6 to 10.0, and/or (ii) the upper thermosensitive layer and the lower thermosensitive layer contain different IR absorbing dyes, and/or (iii) at least one of the upper thermosensitive layer and the lower thermosensitive layer contains an IR absorbent having, in one molecule, at least two chromophoric groups that absorb IR light, with the chromophoric groups bonding to each other via a covalent bond.
Abstract:
A method for preparation of a waterless lithographic printing plate by an electrophotographic process comprising forming a non-fixing toner image by an electrophotographic process using a liquid developer on a surface of an electrophotographic light-sensitive element comprising an electrically conductive support having provided thereon a photoconductive layer, transferring the toner image onto a support for lithographic printing plate, providing a non-tacky resin layer having adhesion to a surface of the support for lithographic printing plate larger than adhesion between the toner image and the surface of the support for lithographic printing plate on the whole surface of the support for lithographic printing plate bearing the toner image, and removing the non-tacky resin layer provided on the toner image. The method is suitable for a scanning exposure system using a laser beam of a low power, and simply and rapidly provides a lithographic printing plate excellent in image qualities and printing durability.
Abstract:
An electrophotographic lithographic printing plate, in which the effect by the hydrophilic property of non-image areas is further improved, and which is stable during storage even under very severe conditions and capable of readily realizing the hydrophilic property in a short time during processing of rendering hydrophilic is provided by a process for the production of an electrophotographic lithographic printing plate, comprising subjecting an electrophotographic photoreceptor to imagewise exposure and forming a toner image, the electrophotographic photoreceptor comprising an electroconductive support having provided thereon at least one photoconductive layer containing photoconductive inorganic compound and a binder resin, the binder resin comprising at least one resin (P) as defined herein, and optionally at least one crosslinking agent, and then subjecting a non-image area of the photoconductive layer to an oil-desensitizing processing with a processing solution containing a hydrophilic compound containing a substituent having a Pearson's nucleophilic constant n of at least 5.5.
Abstract:
A positive planographic printing plate precursor comprising a recording layer containing a water-insoluble and alkali-soluble resin, an infrared absorbent and an organic quaternary ammonium salt. A positive planographic printing plate precursor comprising at least two recording layers containing the resin and the infrared absorbent with a coating amount of an upper positive recording layer being in the range of 0.05 to 0.45 g/m2.
Abstract translation:包含含有水不溶性和碱溶性树脂,红外线吸收剂和有机季铵盐的记录层的正型平版印刷版原版。 包含含有树脂的至少两个记录层和具有上限正性记录层的涂布量在0.05至0.45g / m 2范围内的红外线吸收剂的正型平版印刷版前体。
Abstract:
A positive-type image-forming material and a planographic printing plate precursor having a recording layer composed of the material on a support. The material includes (a) a water-insoluble, aqueous alkaline solution-soluble polymer compound, (b) a light-heat converting agent, and (c) a phenol including a partial structure represented by the following formula (I). Solubility of the material in an aqueous alkaline solution is increased upon heating. In the formula (I), X represents a monovalent terminal group having 2 or more carbon atoms or a linking group of —CY1Y2— or —CHY1— in which Y1 and Y2 each represent a monovalent terminal group having 1 or more carbon atoms, W represents a monovalent terminal group, and n represents an integer from 1 to 4.
Abstract:
A lithographic printing plate support includes a support and a hydrophilic layer on the support, wherein the hydrophilic layer includes a polymer compound that is chemically bonded directly to the support surface and has a hydrophilic functional group.
Abstract:
A negative working waterless lithographic printing plate precursor excellent in image reproducibility and scratch resistance and writable by laser beams, which comprises a support having thereon a light-sensitive layer and a silicone rubber layer provided on the light-sensitive layer, the light-sensitive layer being reduced in adhesion to the silicone rubber layer by exposure, wherein the light-sensitive layer comprises a polymer having at least one group selected from the group consisting of a siloxane group and an alkyl fluoride group and at least one group selected from the group consisting of an unsaturated double bond group and a hydroxyl group.
Abstract:
A method for preparation of a waterless lithographic printing plate by an electrophotographic process comprising forming a non-fixing toner image on a surface of an electrophotographic light-sensitive element comprising an electrically conductive support having provided thereon a photoconductive layer by an electrophotographic process, providing a non-tacky resin layer having adhesion to the surface of electrophotographic light-sensitive element larger than adhesion between the toner image and the surface of electrophotographic light-sensitive element on the whole surface of electrophotographic light-sensitive element bearing the toner image, and selectively removing the non-tacky resin layer provided on the toner image.