C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/11.5
C25D 13/12 (2006.01) B41N 1/08 (2006.01) B41N 3/03 (2006.01) C25D 13/04 (2006.01) G03F 7/16 (2006.01)
Patent
CA 1221333
Abstract of the Disclosure This invention discloses a process for coating a reproduction layer onto one or both sides of 2 metal support material. The process is carried out in two steps: a) The surface of the metal support is electrochemically treated in an aqueous electrolyte to produce a hydrophilic intermediate layer, b) the hydrophilized surface is coated with a photosensitive layer in an electrophoretic process. In step a), the aqueous electrolyte contains at least one water-soluble compound selected from the group consisting of sulfonic, phosphonic and at least tribasic carboxylic acids, phosphoric acid esters which still have at least one acid functional group and alkali metal salts and ammonium salts of said acids or esters (e.g. polyvinyl phosphonic acid or phytic acid). In step b), the aqueous electro- lyte contains at least one photosensitive compound which is soluble or dispersible in water (e.g. a diazonium-salt polycondensate) and optionally a binder which is soluble or dispersible in water. A material which has been coated according to the process of the invention is preferably used as a litho- graphic printing plate.
422365
Dunder Thomas A.
Walls John E.
American Hoechst Corporation
Fetherstonhaugh & Co.
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