Imaging articles
AssigneeKodak Polychrome Graphics LLC
InventorsMichael Yates, Carolyn O'Sullivan, Gerhard Hauck
Life of this patent
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Abstract
An imagable composition, for example a coating on a lithographic printing plate, comprises a carboxylic acid derivative of a cellulosic polymer and a diazide moiety, and may be imaged in various ways, including by ultra-violet radiation, by infra-red radiation and by heat. The presence of the cellulosic polymer can act to enhance resistance to certain organic liquids and/or to increase operating speed.
Claims21
A film-forming composition comprising a carboxylic acid derivative of a cellulosic polymer, and a 1,2,4-naphthoquinone diazide moiety, the composition having the property that when provided as a solid coating on a substrate regions which have been exposed to imaging energy dissolve in an aqueous developer and regions which have not been thus exposed are resistant to dissolution in the aqueous developer and in an organic liquid, wherein the carboxylic acid derivative of the cellulosic polymer provides 0.25-12% of the weight of the composition.
A method of preparing a printing plate or electronic part or mask from a positive working printing plate, electronic part or mask precursor, the printing plate, electronic part or mask precursor comprising
- (a) a substrate;
- and
- (b) an imagable coating on the substrate, wherein the coating comprises a carboxylic acid derivative of a cellulosic polymer, and a 1,2,4-naphthoquinone diazide moiety, wherein the carboxylic acid derivative of the cellulosic polymer provides 0.25-12% of the weight of the composition;
- the method comprising the steps of
- (i) exposing the coating imagewise;
- and
- (ii) removing the exposed portions of the coating using a developer liquid.
A film-forming composition comprising a carboxylic acid derivative of a cellulosic polymer, and a 1,2,4-naphthoquinone diazide moiety, the composition having the property that when provided as a solid coating on a substrate regions which have been exposed to imaging energy dissolve in an aqueous developer and regions which have not been thus exposed are resistant to dissolution in the aqueous developer, wherein the carboxylic acid derivative of the cellulosic polymer provides 0.25-12% of the weight of the composition;
- wherein the composition when provided as a coating on a substrate is more resistant to dissolution in an organic liquid than a corresponding composition not containing a carboxylic acid derivative of a cellulosic polymer.
A method of preparing a printing plate or electronic part or mask from a positive working printing plate, electronic part or mask precursor, the printing plate, electronic part or mask precursor comprising
- (a) a substrate;
- and
- (b) an imagable coating on the substrate, wherein the coating comprises a carboxylic acid derivative of a cellulosic polymer, and a 1,2,4-naphthoquinone diazide moiety, wherein the carboxylic acid derivative of the cellulosic polymer provides 0.25-12% of the weight of the composition;
- the method comprising the steps of
- (i) exposing the coating imagewise;
- and
- (ii) removing the exposed portions of the coating using a developer liquid;
- wherein the coating is more resistant to dissolution in an organic liquid than a corresponding composition not containing a carboxylic acid derivative of a cellulosic polymer.
A film-forming composition comprising a carboxylic acid derivative of a cellulosic polymer, a 1,2,4-naphthoquinone diazide moiety, and a moiety decomposable by ultraviolet radiation, wherein the carboxylic acid derivative of the cellulosic polymer provides 0.25-12% of the weight of the composition, the composition having the property that when provided as a solid coating on a substrate regions which have been exposed to imaging energy dissolve in an aqueous developer and regions which have not been thus exposed are resistant to dissolution in the aqueous developer and in an organic liquid.
A method of preparing a printing plate or electronic part or mask from a positive working printing plate, electronic part or mask precursor, the printing plate, electronic part or mask precursor comprising
- (a) a substrate;
- and
- (b) an imagable coating on the substrate, wherein the coating comprises a carboxylic acid derivative of a cellulosic polymer, a 1,2,4-naphthoquinone diazide moiety, and a moiety decomposable by ultra-violet radiation, wherein the carboxylic acid derivative of the cellulosic polymer provides 0.25-12% of the weight of the composition;
- the methods comprising the steps of
- (i) exposing the coating imagewise to ultra-violet radiation;
- and
- (ii) removing the exposed portions of the coating using a developer liquid.
Dependencies are inferred from the claim text.