How About the Sublimation Ink Receptive Coating of sublimation paper
The sublimation ink receptive coating refers to the coating that is provided on the surface of the sublimation paper substrate for receipt of the sublimation ink. The sublimation ink receptive coating can be referred to as the functional coating because it functions to hold the dye in a position available for sublimation printing. The sublimation ink receptive coating can be referred to more simply as the coating.
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| Sublimation Ink |
An advantage of the sublimation transfer paper according to the present invention is that the sublimation ink or receptive coating can be applied “on machine” during the dye sublimation paper making process. Prior art sublimation print coated papers are often prepared by applying a relatively large amount of coating to a paper substrate “off machine.” Because a relatively large amount of coating is applied to the paper substrate, it is often necessary to utilize coating equipment that can apply a relatively thick coating composition. Such techniques are usually carried out “off machine” and require additional handling of the paper substrate and, possibly, transportation of the paper substrate for the coating “off machine.”
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| Sublimation Ink |
The sublimation ink receptive coating applied to the paper substrate according to the invention can be characterized as a highly functional composition and can be applied at a relatively low coat Weight and, therefore, applied “on machine.” The sublimation ink receptive coating can be applied to the paper substrate at a range of about 1.5 lb/3000ft2 to about 6 lb/3000 ft2, and can preferably be applied at a coat Weight of about 3 lb/3000 ft2 to about 5 lb/3000 ft2. The coat Weight refers to the solids Weight of the composition. When the sublimation ink receptive coating composition is applied to the paper substrate, it can be applied as an aqueous composition having a solids content that provides the resulting sublimation transfer paper With the desired coat Weight of the sublimation ink receptive coating. If the aqueous sublimation ink receptive coating composition is provided With a solids content that is too low or too high, then too little or too much of the solids may be applied. An exemplary solids range for the aqueous sublimation ink receptive coating composition can be about 5 Wt. % to about 70 Wt. % solids. Additional exemplary ranges include about 20 Wt, % to about 50 Wt. % solids, or about 30 Wt. % to about 45 Wt. % solids.
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| Sublimation Ink |
The sublimation ink receptive coating composition includes, as solid components, at least a filler and a binder. The binder helps hold the filler to the paper substrate. The applicants have found that silica (preferably amorphous silica) can be used as a filler in an amount to provide desired properties. The sublimation ink receptive coating composition can include silica at a level of at least about 30 Wt. % and preferably at least about 35 Wt. % based on the solids Weight of the composition. In addition, the coating composition can contain about 35 Wt.% to about 90 Wt. % silica based on the solids Weight of the composition. Furthermore, the sublimation ink receptive coating can include silica in an amount of about 40 Wt. % to about 80 Wt. % based on the solids Weight of the composition. Other fillers can be used in addition to silica. The sublimation ink receptive coating can include a sufficient amount of binder to hold the filler to the paper substrate. The sublimation ink receptive coating can include at least about 5 Wt. % binder, ,and preferably about 5 Wt. % to about 40 Wt. % binder, and preferably about 10 Wt. % to about 30 Wt. %, based on the solids Weight of the composition.
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| Sublimation Ink |
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