Lithographic printing plates having specific grained and anodize

Details Lithographic printing plates having specific grained and anodize Lithographic printing plates having specific grained and anodize

1995-12-04

1998-03-17

Young, Christopher G.

Radiation imagery chemistry: process, composition, or product th

Diazo reproduction, process, composition, or product

Composition or product which contains radiation sensitive...

430157, 4302781, G03F 709

Patent

active

057285039

ABSTRACT:
The present invention relates to supports for lithographic printing plates and to a process for producing the same. In particular, the invention relates to aluminum plates having an electrochemically grained and anodized surface which is has a smooth, shiny surface and hence greater image contrast when a lithographic image is formed thereon. The surface has a substantially uniform surface topography comprising peaks and valleys and surface roughness parameters wherein Ra ranges from about 0.10 to about 0.50 microns, Rz ranges from about 0.00 to about 5.00 microns, Rt ranges from about 0.00 to about 6.00 microns and Rp ranges from about 0.00 to about 4.00 microns. The surface preferably has tristimulus color coordinate values wherein L ranges from about 35.00 to about 75.00, a ranges from about -4.00 to about +4.00 and b ranges from about -4.00 to about +4.00.

REFERENCES:
patent: 4087342 (1978-05-01), Takahashi et al.
patent: 4336113 (1982-06-01), Walls et al.
patent: 4374710 (1983-02-01), Walls
patent: 4396468 (1983-08-01), Walls
patent: 4416972 (1983-11-01), Walls et al.
patent: 4655136 (1987-04-01), Reiss et al.

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