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US 2012/0219773 A1Published application
Method of using mask film to form relief images
AssigneeEastman Kodak Company
InventorsGregory L. Zwadlo, David E. Brown, Elsie A. Fohrenkamm, A. Peter Stolt
Life of this patent
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Abstract
A mask-forming film has a transparent layer between the imageable layer and the carrier sheet, which transparent layer has a refractive index that is lower (by at least 0.04) than that of the carrier sheet or any immediately adjacent layer between it and the carrier sheet. This lower refractive index layer modifies the path of incident radiation during mask image transfer so as to provide steeper shoulder angles in the relief image solid areas. This mask film is used to form a relief image such as in a flexographic printing plate.
Claims17
A film comprising:
- a transparent carrier sheet and having thereon at least one non-silver halide thermally sensitive imageable layer and a colorant disposed in the imageable layer or in a different layer between the carrier sheet and the imageable layer,
- an infrared radiation absorbing compound dispersed in a polymeric binder, and
- the film further comprising a transparent layer disposed between the carrier sheet and the imageable layer and between the carrier sheet and the layer containing the colorant, which transparent layer has a refractive index lower than the refractive index of the carrier sheet or lower than the refractive index of any optional immediately adjacent layer between the carrier sheet and the transparent layer.
Dependencies are inferred from the claim text.