Photosensitive lithographic form plate using an image-forming ma

Details Photosensitive lithographic form plate using an image-forming ma Photosensitive lithographic form plate using an image-forming ma

1999-03-01

2000-08-01

Baxter, Janet

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

4302811, 430302, 430915, 430920, 430926, 430944, G03C 172

Patent

active

060964790

ABSTRACT:
A photosensitive lithographic form plate that can be directly prepared by using digital signals from a computer or the like by using an infrared laser or the like (i.e., a photosensitive lithographic form plate that can be directly prepared), through using an image-forming material that can be directly inscribed with heat generated by irradiation of a laser light and is suitable for use in a lithographic form plate. The image-forming material used in the present invention comprises an infrared light absorbing agent having a hydrophobic group which changes to hydrophilic due to heat. The image-forming material may further contain a macromolecular binder insoluble in water and soluble in an aqueous solution of an alkali, or a macromolecular binder that is decomposed by heat or with an acid and becomes soluble in water or an alkali. In an exposed portion of the photosensitive layer, the infrared light absorbing agent is decomposed due to heat by irradiation of infrared light, and an acid is generated.

REFERENCES:
patent: 5976658 (1999-11-01), Tomizawa et al.

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