EP 0161461 B1 19891213 - PROCESS FOR THE ANODIC OXIDATION OF ALUMINIUM AND ITS USE AS A SUPPORT MATERIAL FOR OFFSET PRINTING PLATES
Title (en)
PROCESS FOR THE ANODIC OXIDATION OF ALUMINIUM AND ITS USE AS A SUPPORT MATERIAL FOR OFFSET PRINTING PLATES
Publication
Application
Priority
DE 3413899 A 19840413
Abstract (en)
[origin: ES8606539A1] In the process for the anodic oxidation of mechanically, chemically and/or electrochemically roughened aluminum or of one of its alloys, an aqueous electrolyte, which is free from H2SO4 and contains H3PO4 and Al+3 ions is used. The process parameters are: an electrolyte content of 25 g/l to 500 g/l of H3PO4 and at least 5 g/l of Al+3 ions, a treatment time of 5 seconds to 500 seconds, a current density of 1 A/dm2 to 30 A/dm2 and a temperature of 35 DEG C. to 95 DEG C. The Al+3 ion source in particular is a salt of aluminum having a phosphoroxo anion, such as AlPO4. The material prepared in accordance with this invention is preferably employed as a support material for offset printing plates which carry a radiation-sensitive layer.
IPC 1-7
IPC 8 full level
G03F 7/00 (2006.01); B41N 3/00 (2006.01); B41N 3/03 (2006.01); C25D 11/04 (2006.01); C25D 11/08 (2006.01)
CPC (source: EP US)
B41N 3/034 (2013.01 - EP US); C25D 11/04 (2013.01 - EP US); C25D 11/08 (2013.01 - EP US); Y10S 205/921 (2013.01 - EP US); Y10S 428/934 (2013.01 - EP US); Y10T 428/257 (2015.01 - EP US); Y10T 428/269 (2015.01 - EP US)
Designated contracting state (EPC)
CH DE FR GB LI NL
DOCDB simple family (publication)
EP 0161461 A2 19851121; EP 0161461 A3 19860730; EP 0161461 B1 19891213; CA 1236421 A 19880510; CN 85102958 A 19861210; DE 3413899 A1 19851017; DE 3574743 D1 19900118; ES 542162 A0 19860416; ES 8606539 A1 19860416; JP H0534158 B2 19930521; JP S60236795 A 19851125; US 4608131 A 19860826; ZA 852736 B 19851127
DOCDB simple family (application)
EP 85104072 A 19850403; CA 478562 A 19850409; CN 85102958 A 19850419; DE 3413899 A 19840413; DE 3574743 T 19850403; ES 542162 A 19850411; JP 7686085 A 19850412; US 72175385 A 19850410; ZA 852736 A 19850412