Dual-wavelength positive-working radiation-sensitive elements

• Main Author: GOODIN JONATHAN W
• Format: Patent
• Language: English
• Published: 29.12.2005
• Edition: 7
• Subjects: AUXILIARY PROCESSES IN PHOTOGRAPHY; CINEMATOGRAPHY; COLOUR PRINTING; ELECTROGRAPHY; HOLOGRAPHY; LINING MACHINES; PERFORMING OPERATIONS; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES; PHOTOGRAPHY; PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHYSICS; PRINTING; PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTINGSURFACES; STAMPS; TRANSPORTING; TYPEWRITERS

A positive-working radiation-sensitive composition for use with a radiation source comprises one or more polymers capable of being eluted in an alkaline aqueous solution and a development-enhancing compound. The invention provides a positive-working photosensitive composition of good sensitivity for use with one or both of ultra-violet radiation and an infrared laser radiation source. The composition is stable in its state before exposure and has an excellent handling property. The sensitivity of a radiation-sensitive coating based on the composition of this invention is increased without compromising the handling characteristics. Radiation-sensitive elements based on the composition of the invention have good development latitude. A positive-working lithographic printing precursor is based on the radiation-sensitive composition coated on a hydrophilic surface. The precursor is developable using an alkaline aqueous solution, and may be used with a radiation source in lithographic applications, such as conventional imaging systems, computer-to-plate systems or other direct imaging applications. The precursor is stable in its state before exposure and has an excellent handling property.