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US 8,632,944 B2Granted
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.
Claims9
A film comprising:
- a transparent carrier sheet and having thereon, in order:
- a transparent layer having a thickness of from about 0.25 μm and up to and including 10 μm, optionally comprising an adhesion promoter, and the transparent layer having a refractive index of at least 0.04 lower than the refractive index of the transparent carrier sheet,
- a barrier layer comprising a poly(cyanoacrylate) or nitrocellulose, or metal oxide particles, and optionally crosslinking agents, and
- at least one non-silver halide thermally sensitive imageable layer comprising an infrared radiation absorbing compound dispersed in a polymeric binder that is a polyurethane, poly(vinyl butyral), acrylamide polymer, nitrocellulose, or polyacetal,
- the film further comprising an intermediate layer disposed between the non-silver halide thermally sensitive imageable layer and the transparent layer, the intermediate layer having a thickness of from about 0.1 to about 10 μm.
2 more elements
Dependencies are inferred from the claim text.