Method of manufacturing a thermally imageable element
AssigneeKodak Polychrome Graphics LLC
InventorPaul Kitson
Life of this patent
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Abstract
Methods of manufacturing multi-layer thermally imageable elements useful as lithographic printing plate precursors are disclosed. The elements comprise a substrate, an underlayer, and an imageable layer. The imageable layer comprises a first polymeric material and o-diazonaphthoquinone containing material. After the underlayer has been coated over the substrate and the imageable layer has been coated over the underlayer, the element is heated to between about 130° C. and about 200° C. for a time sufficient to decrease the sensitivity of the imageable element to the white light.
Claims22
A method for forming a multi-layer positive-working imageable element, the imageable element comprising:
- a substrate comprising a hydrophilic surface;
- an underlayer over the hydrophilic surface of the substrate;
- and
- an imageable layer over the underlayer;
- the method comprising the steps of:
- (a) coating an underlayer over a hydrophilic surface of a substrate;
- (b) coating an imageable layer over the underlayer;
- and
- (c) heating the imageable element at a temperature between about 130° C. and about 200° C. for a time sufficient to increase resistance of the imageable element to an alkaline developer and to decrease the white light sensitivity of the imageable element;
- in which:
- the imageable element comprises a photothermal conversion material;
- the imageable layer is ink receptive;
- the imageable layer is insoluble in the alkaline developer;
- the imageable layer comprises:
- a first polymeric material, and
- an o-diazonaphthoquinone containing material;
- and the underlayer comprises a second polymeric material.
A multi-layer positive-working imageable element, the element comprising a substrate comprising a hydrophilic surface;
- an underlayer over the hydrophilic surface of the substrate;
- and an imageable layer over the underlayer;
- the element prepared by a method comprising the steps of:
- (a) coating an underlayer over a hydrophilic surface of a substrate;
- (b) coating an imageable layer over the underlayer;
- and
- (c) heating the imageable element at a temperature between about 130° C. and about 200° C. for a time sufficient to increase resistance of the imageable element to an alkaline developer and to decrease the white light sensitivity of the imageable element;
- in which:
- the imageable element comprises a photothermal conversion material;
- the imageable layer is ink receptive;
- the imageable layer is insoluble in the alkaline developer;
- the imageable layer comprises:
- a first polymeric material, and
- an o-diazonaphthoquinone containing material;
- and
- the underlayer comprises a second polymeric material.
A method for forming an image, the method comprising, in order, the steps of:
- (a) coating an underlayer over a hydrophilic surface of a substrate;
- (b) coating an imageable layer over the underlayer and forming a multi-layer, positive-working imageable element;
- and
- (c) heating the imageable element at a temperature between about 130° C. and about 200° C. for a time sufficient to increase resistance of the imageable element to an alkaline developer and to decrease the white light sensitivity of the imageable element;
- (d) thermally imaging the imageable element and forming an exposed imageable element comprising exposed regions and unexposed regions;
- and
- (e) developing the exposed imageable element and removing the exposed regions;
- in which:
- the imageable element comprises a photothermal conversion material;
- the imageable layer is ink receptive;
- the imageable layer is insoluble in the alkaline developer;
- the imageable layer comprises:
- a first polymeric material, and
- an o-diazonaphthoquinone containing material;
- and
- the underlayer comprises a second polymeric material.
Dependencies are inferred from the claim text.