Heat-sensitive imaging element for making positive working print

Details Heat-sensitive imaging element for making positive working print Heat-sensitive imaging element for making positive working print

1998-02-18

2000-03-21

Hamilton, Cynthia

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

430302, 430911, 430926, 430944, G03F 700

Patent

active

060401133

ABSTRACT:
Heat-sensitive imaging element for making positive working printing plates according to the present invention there is provided a heat-sensitive imaging element for making positive working lithographic printing plates comprising on a lithographic base a layer comprising a polymer, soluble in an aqueous alkaline solution and an IR-radiation sensitive top layer. Upon image-wise exposure the capacity of the aqueous alkaline solution to penetrate and/or solubilize the top layer is changed. Image-wise exposure can be performed with an infrared laser with a short as well as with a long pixel well time.
The obtained positive working printing plates have excellent printing properties and an improved infrared sensitivity.

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