Article having imagable coatings
AssigneeKodak Polychrome Graphics LLC
InventorsMICHAEL YATES, CELIN SAVARIAR-HAUCK, GERHARD HAUCK, HANS-JOACHIM TIMPE
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Abstract
A heat-sensitive composition, for example a coating on a lithographic printing plate, comprises a carboxylic acid derivative of a cellulosic polymer. The composition may contain a radiation absorbing compound and suitable electromagnetic radiation, preferably infra-red radiation, may be used to heat the composition imagewise. The presence of the cellulosic polymer enhances resistance to certain organic liquids.
Claims25
A film-forming composition comprising a carboxylic acid derivative of a cellulosic polymer, and a compound which absorbs incident radiation in the wavelength range 600-1400 nm and converts it to heat, the composition having the property that when provided as a coating on a substrate, imagewise heated and subjected to an aqueous developer, regions which have been heated dissolve in the aqueous developer leaving behind regions which have not been heated and which are resistant to organic liquids.
A positive working printing plate precursor or electronic part precursor or mask precursor having a coating on a substrate, the coating comprising a composition as claimed in claim.
A heat imagable printing plate precursor or electronic part precursor or mask precursor having a coating on a substrate, the coating comprising a carboxylic acid derivative of a cellulosic polymer, and a compound which absorbs incident radiation in the wavelength range 600-1400 nm and converts it to heat, the coating having the property that when imagewise heated and subjected to an aqueous developer, regions which have been heated dissolve in the aqueous developer leaving behind regions which have not been heated;
- wherein the coating has improved chemical resistance in comparison with a corresponding coating not containing the carboxylic acid derivative of the cellulosic polymer.
A method of improving the chemical resistance of a heat imagable coating provided on a printing plate precursor or electronic part precursor or mask precursor, the method comprising the incorporation, during the manufacture of the precursor, of a carboxylic acid derivative of a cellulosic polymer into the composition which is to provide the coating;
- wherein the coating has improved chemical resistance in comparison with a corresponding coating not containing the carboxylic acid derivative of the cellulosic polymer.
Dependencies are inferred from the claim text.