Process of making lithographic plate, and plate from photosensit

Details Process of making lithographic plate, and plate from photosensit Process of making lithographic plate, and plate from photosensit

1978-05-10

1980-10-07

Kimlin, Edward C.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making printing plates

101456, 101457, 101465, 430276, 430306, 430309, 430525, G03F 702, B41N 100, B41M 500

Patent

active

042269318

ABSTRACT:
The adherence of the oleophilic polymer printing surface of a lithographic printing plate to the support of the lithographic printing plate is improved by an anchoring layer formed from a hydrophobic oleophilic ester colloid which is capable of being rendered hydrophilic by treatment with an aqueous alkali solution. After an image-wise exposure of the photosensitive layer of the presensitized photosensitive sheet used to prepare the lithographic printing plate and removal of the non-polymerized (non-image) portions of the photosensitive layer the plate is contacted with an aqueous alkali solution to render those portions of the anchoring layer, which have been exposed by removal of the non-polymerized portions of the photosensitive layer, hydrophilic. Accordingly, the portions of the anchoring layer underlying the oleophilic hardened polymeric printing surface remain hydrophobic oleophilic and therefore can increase the number of satisfactory printings which can be made from the lithographic printing plate.

REFERENCES:
patent: 2791504 (1957-05-01), Plambeck
patent: 3036913 (1962-05-01), Burg
patent: 3262780 (1966-07-01), Thommes et al.
patent: 3386850 (1968-06-01), Adams et al.
patent: 3801328 (1974-04-01), Takimoto et al.
patent: 3860426 (1975-01-01), Cunningham et al.
patent: 3877939 (1975-04-01), Okai
patent: 4060656 (1977-11-01), Naka et al.

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