EP 0139111 B1 19871104 - PROCESS FOR TWO STEP ANODIC OXIDATION OF ALUMINIUM CARRIER MATERIALS FOR OFFSET PRINTING PLATES
Title (en)
PROCESS FOR TWO STEP ANODIC OXIDATION OF ALUMINIUM CARRIER MATERIALS FOR OFFSET PRINTING PLATES
Publication
Application
Priority
DE 3328048 A 19830803
Abstract (en)
[origin: US4606975A] Disclosed is a base for offset printing plates in the form of a sheet, a foil or a web and a process for producing same which includes the steps of chemically, mechanically and/or electrochemically roughening aluminum or one of its alloys, and forming an oxide layer by means of a two-stage anodic oxidation in (a) an aqueous electrolyte which comprises phosphorus-containing anions and (b) an aqueous electrolyte based on sulfuric acid. A H3PO4-free electrolyte comprising dissolved phosphoroxo anions is employed in the first stage. Also disclosed are an offset printing plate and a process for producing same.
IPC 1-7
IPC 8 full level
C25D 11/08 (2006.01); B41N 1/08 (2006.01); B41N 3/00 (2006.01); B41N 3/03 (2006.01); C25D 11/12 (2006.01)
CPC (source: EP US)
B41N 3/034 (2013.01 - EP US); C25D 11/12 (2013.01 - EP US); Y10S 205/917 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
DE 3328048 A1 19850221; DE 3467192 D1 19871210; EP 0139111 A1 19850502; EP 0139111 B1 19871104; JP H0375639 B2 19911202; JP S6056093 A 19850401; US 4606975 A 19860819
DOCDB simple family (application)
DE 3328048 A 19830803; DE 3467192 T 19840725; EP 84108776 A 19840725; JP 16301984 A 19840803; US 63455084 A 19840726