Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Treating substrate prior to coating
Reexamination Certificate
2001-09-14
2004-07-20
Wong, Edna (Department: 1753)
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Treating substrate prior to coating
C205S324000, C205S201000, C205S203000
Reexamination Certificate
active
06764587
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a process for producing an aluminum support for a planographic printing plate which can remarkably reduce raw material costs and which enables high image-quality printing, and to an aluminum support for a planographic printing plate and a planographic printing master plate. Also, the present invention relates to a process for producing an aluminum support for a planographic printing plate having excellent printability with regard to resistance to severe ink soiling and blanket soiling, an aluminum support for a planographic printing plate and a planographic printing master plate. Furthermore, the present invention relates to an aluminum support for a planographic printing plate which can remarkably reduce raw material costs and which has fine crystal grains, giving high image quality and printing durability.
2. Description of the Related Art
Generally, an aluminum support for a planographic printing plate (hereinafter simply called “support” or “planographic printing plate-use aluminum support” as the case may be) is produced by carrying out, for example, a roughening treatment for one or both surfaces of an aluminum plate. Also, a planographic printing master plate is produced by disposing, for example, a light-sensitive layer on the support. In most of the above supports, the surface of the aluminum plate is treated by anodic oxidation after the surface-roughening treatment to improve the wear resistance of the planographic printing plate during printing. Also, the surface of the light-sensitive layer is occasionally provided with fine irregularities called a matt layer to shorten a time required for vacuum adhesion during plate-making. The planographic printing master plate produced in this manner is made into a planographic printing plate through a plate-making process including image exposure, developing and washing with water. As a method for image exposure, a method in which a lith film on which an image is printed is made to adhere to the surface of the support and irradiated with light to thereby make an image portion different from a non-image portion, a method in which an image portion or a non-image portion is directly written by a method using a laser, or a method in which an image is projected thereby making the image portion different from the non-image portion can be used.
Also, after a developing treatment performed after the image exposure, the undissolved portion of the light-sensitive layer serves as an ink-receptor and forms an image portion, and, at a portion where the light-sensitive layer is dissolved and removed, the surface of the aluminum or the anodic oxide film underneath is exposed externally and serves as a water-receptor and forms a non-image portion. After developing, a hydrophilicizing treatment, gum drawing and a further burning treatment may be carried out according to the need.
Such a planographic printing plate is attached to a cylindrical print drum of a printer and ink and damping water are supplied to the print drum. This results in the ink sticking to the lipophilic image portion and the water sticking to the hydrophilic non-image portion. The planographic printing plate works to transfer the ink of the image portion to a blanket drum and then an image is printed from the blanket drum on paper.
However, there are cases where ink is occasionally stuck to the non-image portion in dot or ring patterns, giving rise to the problem that dot-like or ring-like spots on paper (severe ink spots) are caused resultantly.
In order to restrain the occurrence of such severe ink spots and the like, it has been considered to adopt a method using an aluminum alloy material containing a virgin metal and predetermined additive element components as an aluminum alloy material to be used for the support. However, these materials have the drawback that the costs of these materials themselves are high.
It has also been considered to adopt a method using waste aluminum which is generated in aluminum factories and of which the alloy composition is known. Although the method has the advantage that yield from raw materials is improved, this waste aluminum is not cheap.
On the other hand, if the adhesion between the image portion and the light-sensitive layer is insufficient when the ink of the image portion is transferred to the blanket drum and the image is printed from the blanket drum on paper, this pose the problem that a lower number of copies can be printed before termination of printing. As methods for improving the adhesion between the image and the light-sensitive layer, a method in which an intermediate layer is interposed between the aluminum alloy plate and the light-sensitive layer and a method in which the aluminum alloy plate is uniformly roughened are known.
An amino acid or its salts (e.g., alkali metal salts such as Na salts and K salts; ammonium salts; hydrochlorides; oxalates; acetates; and phosphates) as disclosed in Japanese Patent Application Laid-open (JP-A) No. 60-149491, amines having a hydroxyl group or salts thereof (e.g., hydrochlorides; oxalates; and phosphates) as disclosed in JP-A-60-232998 or compounds having an amino group and a phosphonic acid group or salts thereof as disclosed in Japan Patent Application No. 63-165183 may be used for an undercoating intermediate layer. Also, compounds having a phosphonic acid group as disclosed in JP-A-4-282637 may be used for the intermediate layer. Moreover, it is known that after treatment using an alkali metal silicate is carried out, a high molecular compound containing an acid group and an onium group as disclosed in JP-A-9-264309 (JP-A-11-109637) is used for the intermediate layer. However, the method in which an intermediate layer for improving adhesion is formed between the roughened surface and the light-sensitive layer, as a matter of course, poses the problem of increased production costs for the formation of the intermediate layer.
On the other hand, it is known that in order to carry out a surface-roughening treatment uniformly, alloy components which are contained in the aluminum alloy and adversely affect the formation of a rough surface should be limited.
Many proposals have been disclosed as a method for limiting alloy components. Technologies concerning, for example, the material of JIS 1050 are disclosed in JP-A-59-153861, JP-A-61-51395, JP-A-62-146694, JP-A-60-215725, JP-A-60-215726, JP-A-60-215727, JP-A-60-215728, JP-A-61-272357, JP-A-58-11759, JP-A-58-42493, JP-A-58-221254, JP-A-62-148295, JP-A-4-254545, JP-A-4-165041, Japanese Patent Application Publication (JP-B) No. 3-68939, JP-A-3-234594, JP-B-1-47545 and JP-A-62-140894 by the inventors of the present invention. Also, JP-B-1-35910, JP-B-55-28874 and the like are known. Technologies concerning the material of JIS 1070 are disclosed in JP-A-7-81264, JP-A-7-305133, JP-A-8-49034, JP-A-8-73974, JP-A-8-108659 and JP-A-8-92679 by the inventors of the present invention.
Technologies concerning Al—Mg type alloys are disclosed in JP-B-62-5080, JP-B-63-60823, JP-B-3-61753, JP-A-60-203496, JP-A-60-203497, JP-B-3-11635, JP-A-61-274993, JP-A-62-23794, JP-A-63-47347, JP-A-63-47348, JP-A-63-47349, JP-A-64-61293, JP-A-63-135294, JP-A-63-87288, JP-B-4-73392, JP-B-7-100844, JP-A-62-149856, JP-B-4-73394, JP-A-62-181191, JP-B-5-76530, JP-A-63-30294 and JP-B-6-37116 by the inventors of the present invention. Also, JP-A-2-215599 and JP-A-61-201747 are known.
Technologies concerning Al—Mn type alloys are disclosed in JP-A-60-230951, JP-A-1-306288 and JP-A-2-293189 by the inventors of the present invention. Also, JP-B-54-42284, JP-B-4-19290, JP-B-4-19291, JP-B-4-19292, JP-A-61-35995, JP-A-64-51992, U.S. Pat. Nos. 500,972, 5,028,276 and JP-A-4-226394 are known.
Technologies concerning Al—Mn—Mg type alloys are disclosed in JP-A-62-86143 and JP-A-3-222796 by the inventors of the present invention. Also, JP-B-63-60824, JP-A-60-63346, JP-A-60-63347, EP223737, JP-A-1-283350, U.S. Pat. No. 4,818,300, BR1222777 and the like are known.
Technologies concerning Al—Z
Masuda Yoshitaka
Nishino Atsuo
Sawada Hirokazu
Uesugi Akio
Fuji Photo Film Co. , Ltd.
Wong Edna
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