Process for preparation of lithographic printing plates

Details Process for preparation of lithographic printing plates Process for preparation of lithographic printing plates

1975-07-16

1977-05-10

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

204 58, C25D 1106, C25D 1108, C25D 1110, C25D 1118

Patent

active

040226700

ABSTRACT:
Lithographic printing plates of aluminum or aluminum alloys are provided with an anodized surface layer, to which a photosensitive layer may be directly applied, which displays excellent adhesion and durability in use. For this purpose, anodization is carried out with an aqueous solution containing a polybasic mineral acid such as sulfuric and a higher concentration of a polybasic aromatic sulfonic acid containing at least one additional nuclear acidic substituent, preferably two, selected from the group consisting of a carboxylic acid group and a phenolic hydroxyl group.

REFERENCES:
patent: 3031387 (1962-04-01), Deal
patent: 3227639 (1966-01-01), Kampert
patent: 3328274 (1967-06-01), Bushey et al.
patent: 3594289 (1971-07-01), Watkinson
patent: 3804731 (1974-09-01), Yanagida et al.
patent: 3881998 (1975-05-01), Miyosawa

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