Multilayered structure with water-impermeable substrate
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Example
[0091]The results of Example 1 indicate that improved wetting, adhesion, and optical density are obtained when an anionically stabilized water-based pigment ink is printed on a water-impermeable substrate for which the surface energy of the water-impermeable substrate is increased by use of a corona discharge treatment process. However, as shown in FIG. 3, the overall image quality suffers from the fact that the colorant is sufficiently mobile after printing but before drying that neighboring drops tend to merge and coalesce. Furthermore, areas of the CDT'ed and printed films that are greater than about 70% coverage remain tacky and do not completely dry to the touch.
[0092]2. Comparative. To this same set of films was applied a water-based ink-receptive layer. A solution comprising 50 parts polyvinyl alcohol polymer (Gohsenol GH17, Nippon Gohsei), 20 parts anhydrous CaCl2, 2.5 parts Cartabond TSI cross linker (Clariant), and 2 parts Lanco PTFE wax particles (Lubrizol) was prepared i...
Example
[0094]The ink-receptive layer used in Example 2 was applied to a 2-mil thick, clear, oriented polypropylene film (ExxonMobil) using a reverse gravure coating technique. Prior to the coating station, the film was treated with a corona discharge such that effective wetting of the coating fluid to the film was achieved. After drying, the resulting coating was smooth and uniform with a coat weight of approximately 0.85 g / m2. For this example, the dry coat weight of CaCl2, was approximately 220 mg / m2, and the ratio of CaCl2 to cross-linked hydrophilic polymer is 0.38.
[0095]The coated film was printed with anionically stabilized pigment inks identical to those disclosed in U.S. Pat. No. 8,455,570 using Kodak Stream continuous inkjet print heads. A test image containing patches from 0 to 100% ink coverage in 10% increments was printed with cyan ink. The test image was air-dried under ambient conditions for 24 hours and all color patches were found to be dry to the touch. This was analyzed ...
Example
[0096]The same materials and procedures of Example 3A were used, except for the use of Bicor 84AOH OPP film (ExxonMobil) instead of the plain, uncoated 2-mil OPP film. The Bicor OPP film is 0.84 mil (21 um) thick, and comprises a water-based tie-layer, approximately 0.4-um thick, on one surface. The water-based tie-layer composition further comprises two sub-layers as disclosed in U.S. Pat. No. 5,380,586, with the outermost layer comprising a cross-linked polyvinyl alcohol. The water-based ink-receptive layer described above in Example 3A was coated over this layer and dried. The resulting ink-receptive layer was again smooth and uniform with a similar coat weight as Example 3A.
[0097]The inventive example 3B was printed and tested as described above for Example 3A. The test image was air-dried under ambient conditions for 24 hours and all color patches were found to be dry to the touch. The results are summarized in the following table.
FilmCyanCyanCyanExamplesupportDmaxGrainMottleTa...
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Abstract
- a) a water-impermeable substrate;
- b) a first layer on at least one surface of the substrate comprising a water-based tie-layer composition;
- c) a second layer formed over the first layer, wherein the second layer is a water-based ink-receptive composition includes:
- i) a multivalent metal salt; and
- ii) a hydrophilic binder polymer;
- d) a third layer including at least one water-based ink composition deposited in a single pass by an inkjet printing process, wherein the water-based ink composition includes an anionically stabilized, water-dispersible pigment; and
- e) additional layers deposited over the one or more ink layers and exposed second layer, the additional layers selected from one or more of the following compositions:
- i) an opaque white layer;
- ii) a protective layer; and
- iii) an adhesive layer, further includes a continuous protective plastic or paper layer adhered thereto.
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