Mask forming imageable material and use
View Patent ↗An imageable material can be used to form a mask image for providing a relief image. This imageable material has a simplified structure and consists essentially of, in order: a transparent polymeric carrier sheet and a barrier layer comprising a first infrared radiation absorbing compound. A first ultraviolet radiation absorbing compound is provided in the transparent polymeric carrier sheet or the barrier layer. A non-silver halide thermally sensitive imageable layer is disposed on the barrier layer and comprises a second infrared radiation absorbing compound and a second ultraviolet radiation absorbing compound. A relief image is formed by imaging the imageable material to form an imaged mask material, exposing a relief-forming material with curing radiation through the imaged mask material to form exposed regions and non-exposed regions, and developing the imaged relief-forming material to form a relief image by removing its non-exposed regions.
1. An imageable material consisting essentially of, in order:
(a) a transparent polymeric carrier sheet,
(b) a barrier layer disposed directly on the transparent polymeric carrier sheet, the barrier layer comprising a first infrared radiation absorbing compound,
wherein either or both of the transparent polymeric carrier sheet and barrier layer further comprise a first ultraviolet radiation absorbing compound, and
(c) a non-silver halide thermally sensitive imageable layer disposed directly on the barrier layer, the non-silver halide thermally sensitive imageable layer comprising a second infrared radiation absorbing compound and a second ultraviolet radiation absorbing compound, both dispersed within a polymeric binder wherein the first ultraviolet radiation absorbing compound and the second ultraviolet absorbing compound are same or different UV-absorbing dyes, and the total amount of the first ultraviolet radiation absorbing compound in either or both of the transparent polymeric carrier sheet and the barrier layer, is less than the amount of the second ultraviolet radiation absorbing compound.
2. The imageable material of claim 1 , further containing a transparent polymeric overcoat layer disposed directly to the non-silver halide thermally sensitive imageable layer.
3. The imageable material of claim 1 , wherein the first ultraviolet radiation absorbing compound is present only in the barrier layer.
4. The imageable material of claim 1 , wherein the barrier layer comprises a heat-combustible polymer binder that is nitrocellulose, a poly(cyanoacrylate), or a combination thereof, and optionally metal oxide particles or crosslinking agents, or
the barrier layer is a metal or metalized layer.
5. The imageable material of claim 1 , wherein the non-silver halide thermally sensitive imageable layer comprises a polymer or resin binder that is a polyurethane, poly(vinyl butyral), (meth)acrylamide polymer, nitrocellulose, polyacetal, polymer derived at least in part from any of methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, and isobutyl methacrylate, or a combination of two or more of these materials, or
the transparent polymeric carrier sheet comprises a polyester, polyethylene-polypropylene copolymer, polybutadiene, polycarbonate, polyacrylate, vinyl chloride polymer, hydrolyzed or non-hydrolyzed cellulose acetate, or a combination of two or more of these materials, and optionally comprising an adhesion promoter.
6. The imageable material of claim 1 , comprising one or more of the following conditions:
(i) the transparent polymeric carrier sheet has an average dry thickness of at least 25 μm and up to and including 250 μm,
(ii) the barrier layer has an average dry thickness of at least 0.25 μm and up to and including 2.5 μm,
(iii) the non-silver halide thermally sensitive imageable layer has an average dry thickness of at least 0.5 μm and up to and including 5 μm,
(iv) the first ultraviolet absorbing compound is present only in the barrier layer, and
when the imageable material further comprises a transparent polymeric overcoat layer attached directly to the non-silver halide thermally sensitive imageable layer, and the transparent polymeric overcoat layer has an average dry thickness of at least 0.05 μm and up to and including 1 μm.
7. The imageable material of claim 1 , wherein the non-silver halide thermally sensitive imageable layer comprises the polymeric binder in an amount of at least 25 weight % and up to and including 75 weight %.
8. The imageable material of claim 1 , wherein the first and second infrared radiation absorbing compound are the same material.