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US 6,649,324 B1Granted
Aqueous developer for lithographic printing plates
AssigneeKodak Polychrome Graphics LLC
InventorsUlrich Fiebag, Celin Savariar-Hauck
Life of this patent
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Abstract
An aqueous developer for lithographic printing plates and a method for developing the printing plates are disclosed. The developer comprises an organic dispersing agent. The developer develops multi-layer printing plates quickly, with high throughput, but with no sludge formation in the developing process.
Claims19
A method for forming an image, the method comprising the steps of:
- (A) providing an imagewise exposed imageable element comprising exposed and unexposed regions,
- in which:
- the imageable element comprises, in order:
- a top layer;
- an underlayer;
- and
- a hydrophilic substrate;
- the underlayer comprises a polymeric material that is soluble or dispersible in a developer;
- the top layer comprises a polymeric material that is dispersible in the developer;
- and
- the top layer is ink-receptive;
- (B) applying the developer to the imagewise exposed imageable element, removing the exposed regions of the imageable element, and forming the image;
- in which:
- the developer comprises water and a dispersing agent;
- the developer has a pH of about 7 to about 11, and
- the dispersing agent is a partially neutralized acetophosphonate amine salt.
13 more elements
A method for forming an image, the method comprising the steps of
- (A) providing an imageable element comprising, in order:
- a top layer;
- an underlayer;
- and
- a hydrophilic substrate;
- the underlayer comprises a polymeric material that is soluble or dispersible in a developer;
- the top layer comprises a polymeric material that is dispersible in the developer;
- and
- the top layer is ink-receptive;
- (B) thermally exposing the imageable element and producing an imagewise exposed imageable element comprising exposed and unexposed regions;
- (C) applying a developer to the imagewise exposed imageable element, removing the exposed regions of the imageable element, and forming the image
- in which:
- the developer comprises water and a dispersing agent;
- the developer has a pH of about 7 to about 11, and
- the dispersing agent is a partially neutralized acetophosphonate amine salt.
12 more elements
A composition useful as a developer for lithographic printing plates, the composition comprising:
- water;
- an organic dispersing agent;
- a buffer;
- and
- an organic solvent or a mixture of organic solvents;
- in which:
- the composition has a pH of about 7 to about 11;
- and
- the dispersing agent is a partially neutralized acetophosphonate amine salt.
6 more elements
Dependencies are inferred from the claim text.