Protective coating for thermal images
AssigneeThe Standard Register Company
InventorsRajendra Mehta, Dale Lakes, William Saluke
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Abstract
A protective coating composition for protection of thermal images on thermal paper is provided. A mixture of oligomers, monomers, and a photocatalyst are blended together, coated onto thermal paper and then cured by ultraviolet radiation. The coating provides protection to images subsequently printed on the paper by providing resistance to solvents, abrasion and fading due to exposure to light.
Claims15
A thermally sensitive printable paper which is resistant to solvents, abrasion, and fading from exposure to light comprising a thermally printable paper substrate having a thermally imageable coating thereon and a protective coating layer over said thermally imageable coating comprising a mixture of an aliphatic urethane acrylate, an epoxy diacrylate, trimethylolpropane triacrylate, 1,6-hexanediol diacrylate, a multifunctional polyester acrylate, and a photocatalyst.
A thermally sensitive printable paper which is resistant to solvents, abrasion, and fading from exposure to light comprising a thermally printable paper substrate having a thermally imageable coating thereon and a protective coating layer over said thermally imageable coating comprising a blend of ultraviolet radiation curable oligomers and monomers and a photocatalyst, wherein said oligomers comprise aliphatic urethane acrylates and epoxy diacrylates and said monomers comprise a blend of difunctional, trifunctional and multifunctional acrylates.
A thermally sensitive printable paper which is resistant to solvents, abrasion, and fading from exposure to light comprising a thermally printable paper substrate having a thermally imageable coating thereon and a protective coating layer over said thermally imageable coating comprising 15-50% by weight of a mixture of aliphatic urethane acrylate and epoxy diacrylate;
- 15-40% by weight of a mixture of trimethylolpropane triacrylate, 1,6-hexanediol diacrylate and multifunctional polyester acrylate;
- and 6-12% by weight of a photocatalyst.
A thermally sensitive printable paper which is resistant to solvents, abrasion, and fading from exposure to light comprising a thermally printable paper substrate having a thermally imageable coating thereon and a protective coating layer over said thermally imageable coating comprising 15-50% by weight of a mixture of aliphatic urethane acrylate and epoxy diacrylate;
- 15-40% by weight of a mixture of trimethylolpropane triacrylate, 1,6 hexanediol diacrylate and multifunctional polyester acrylate;
- 6-12% by weight of a photocatalyst;
- 5% by weight of an amine accelerator;
- 2-4% by weight of a styrene-maleic anhydride resin;
- and 4-6% by weight of a surface active additive.
Dependencies are inferred from the claim text.