Method of manufacturing coating sheet, coating sheet, polarizing plate, optical element and image display device
A manufacturing method and film coating technology, which are applied to optical elements, polarizing elements, and devices for coating liquid on surfaces, etc., can solve the problems of uneven phase difference and uneven interference of resin layers, and achieve the effect of uniform film thickness.
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Embodiment 1
[0170] 10% by weight of polyimide (represented by the following formula (30), weight average molecular weight Mw=140000) was dissolved in methyl isobutyl ketone to prepare a polyimide solution with a viscosity of 200 mPa·sec.
[0171] Use the coating mode of die coater, control the travel speed of polyethylene terephthalate film (thickness 75 μ m) to be 20m / min, and the rate of change of its speed of progress is controlled at 2.7%, on above-mentioned sheet material The aforementioned polyimide solution was applied, and after application, it was dried at 120° C. for 3 minutes to obtain a coated film sheet having a film thickness of 6 μm.
[0172] Figure 5 A planar photograph of the coated sheet obtained in Example 1 is shown. in addition, Figure 5 Arrows in indicate the direction of travel of the substrate film.
[0173] like Figure 5 It was shown that in the obtained coated film sheet, no interference unevenness due to thickness unevenness was observed visually.
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Embodiment 2
[0179] Except that the viscosity of the polyimide solution was adjusted to 500 mPa·sec, the rest was the same as in Example 1.
[0180] The obtained coated film sheet and Figure 5 As shown, similarly, interference unevenness due to thickness unevenness was not recognized visually.
Embodiment 3
[0182] Except that the viscosity of the polyimide solution was adjusted to 1000 mPa·sec, the rest was the same as in Example 1.
[0183] The obtained coated film sheet and Figure 5 As shown, similarly, interference unevenness due to thickness unevenness was not recognized visually.
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