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1. WO2007146670 - WATER-SOLUBLE COATINGS FOR MEDIA

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[ EN ]

CLAIMS
At least the following is claimed:
1. A water-soluble polymer layer comprising:
a water-soluble polymer;
a radiation absorbing compound disposed in the water-soluble polymer; an activator disposed in the water-soluble polymer; and
a color former disposed in the water-soluble polymer.

2. The water-soluble polymer layer of claim 1 , wherein the water-soluble polymer is selected from at least one of the following: polyvinyl alcohol, cationic polyvinylalcohol, acetoacetylated polyvinylalcohol, silylated polyvinylalcohol, carboxylated polyvinylalcohol, polyvinylpyrrolidone, copolymer of polyvinylacetate and polyvinylpyrrolidone, copolymer of polyvinylalcohol and polyvinylpyrrolidone, cationic polyvinylpyrrolidone, gelain, hydroxyethylcellulose, methyl cellulose, polyethyleneimine,
polyallylamine, polyvinylamine, dicyandiamide-polyalkylenepolyamine condensate, polyalkylenepolyamine-dicyandiamideammonium
condensate, dicyandiamide-formalin condensate, an addition polymer of epichlorohydrin-dialkylamine, a polymer of
diallyldimethylammoniurnchloride ("DADMAC"), a copolymer of
diallyldimethylammoniumchloride-SOa, polyvinylimidazole,
polyvinylpyrrolidone, a copolymer of vinylimidazole, polyamidine,
chitosan, cationized starch, polymers of
vinylbenzyltrimethylqammoniumchloride, (2- methacryloyloxyethyOtrimethyl-ammoniumchloride, polymers of
dimethylaminoethylmethacrylate, a polyvinylalcohol with a pendant quaternary ammonium salt, and combinations thereof.

3. The water-soluble polymer layer of claim 1 , wherein the water-soluble polymer is selected from at least one of the following: water dispersible polymers, gelatin, emulsion polymers, and combinations thereof.

4. The water-soluble polymer layer of claim 1 , wherein the water-soluble polymer includes polyvinyl alcohol.

5. The water-soluble polymer layer of claim 1 , wherein the water-soluble
polymer is about 10 to 60 weight percent of the layer, the radiation
absorbing compound is about 0.2 to 5 weight percent of the layer, the
activator is about 2 to 20 weight percent of the layer, and the color former is about 3 to 35 weight percent of the layer.

6. The water-soluble polymer layer of claim 1 , further comprising a
crosslinking agent.

7. The water-soluble polymer layer of claim 1 , further comprising hollow
beads.

8. The water-soluble polymer layer of claim 1 , further comprising a
crosslinking agent and hollow beads.

9. The water-soluble polymer layer of claim 1 , wherein the water-soluble layer is part of a substrate is selected from a paper medium, a
transparency, a compact disk (CD), and a digital video disk (DVD).

10. A method for preparing an image recording medium, the method
comprising:
providing a water-soluble polymer, a radiation absorbing compound, an activator, and a color former;
mixing the water-soluble polymer, the radiation absorbing
compound, the activator, and the color former to form a direct imaging material; and
disposing the direct imaging material onto a substrate.