Transparent laminated film and its mfg. method
A manufacturing method and a barrier technology, which are applied in the field of barrier laminate films and their manufacture, can solve the problems of coating obstacles, film breakage, and inability to directly use coating laminates and the like
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Embodiment 1
[0113] An ethylene-vinyl alcohol copolymer (polymerization degree: 500, saponification degree: 98.5 mol%, ethylene content: 8 mol%) was dissolved in hot water to obtain a 5% aqueous solution A. Separately, polyacrylic acid (manufactured by Wako Pure Chemical Industries, Ltd., polymerization degree: 2080, 25% aqueous solution) was neutralized with sodium hydroxide at 10%, and diluted with water to obtain a 5% aqueous solution B. Then, A and B were mixed at each ratio shown in Table 1 to prepare a coating liquid.
[0114] The coating solution was coated on the corona-treated surface of a biaxially stretched polyester film (trade name "EMBLET PET12" made by UNITIKA) with a thickness of 12 μm using a Mayer bar, and dried with a hot air dryer to form a thick 1.5 μm barrier layer. Then, this film was fixed on a cardboard, and heat-treated in an oven at 200° C. for 15 minutes to obtain a barrier laminated film.
[0115] The properties of the obtained barrier laminated film were eva...
Embodiment 2
[0129] The 5% aqueous solution A of the ethylene-vinyl alcohol copolymer obtained in Example 1 and the aqueous solution B of polyacrylic acid were mixed at a ratio of A:B=25:75 to obtain a coating liquid.
[0130] This coating solution was applied to a 12 μm thick aluminum oxide vapor-deposited biaxially stretched polyethylene terephthalate film (trade name "TL-PET H#12" manufactured by Tocel Corporation) with a Meyer bar. The alumina vapor-deposited surface was dried with a hot air dryer to form a barrier layer with a thickness of 0.5 μm. Then, this laminated film was fixed on a thick paper, and heat-treated in an oven at 200° C. for 5 minutes to obtain a barrier laminated film.
[0131] The oxygen permeability of the measured barrier laminated film is 3.0ml / m 2 · day · MPa. And the light transmittances of the obtained barrier laminated film at wavelengths of 500 nm and 400 nm were measured to be 91% and 89%.
Embodiment 3
[0133] Using the same coating liquid as in Example 2, except that the thickness of the barrier layer was 0.25 μm, a barrier laminated film was obtained in the same manner as in Example 2. The oxygen permeability of the obtained barrier laminated film was 2.9ml / m 2 ·day·MPa, the light transmittance of wavelength 500nm and 400nm is 92% and 89%.
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