Laminated polyester film
A technology of laminating polyester film and polyester film, applied in the direction of polyurea/polyurethane coatings, coatings, layered products, etc., can solve the problems of low brightness, poor adhesion and low total light transmittance of polarizers , to achieve the effect of high industrial value
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manufacture example
[0041] Next, although the production example of the polyester film in this invention is demonstrated concretely, it is not limited to the following production example at all.
[0042] That is, it is preferable to obtain an unstretched sheet by cooling and solidifying a melted sheet extruded from a die with a cooling roll using the above-mentioned polyester raw material. At this time, in order to improve the planarity of the sheet, it is preferable to increase the adhesion between the sheet and the rotating cooling drum, and it is preferable to use an electrostatic adhesion method and / or a liquid coating adhesion method. Next, the obtained unstretched sheet is stretched in biaxial directions. At this time, first, the aforementioned unstretched sheet is stretched in one direction by a stretching machine of a roll or tenter type. The stretching temperature is usually 70 to 120°C, preferably 80 to 110°C, and the stretching ratio is usually 2.5 to 7 times, preferably 3.0 to 6 time...
Embodiment 1
[0153] Mix polyester (A) and (B) at a ratio of 90% and 10%, respectively, as the raw material of the outermost layer (surface layer), and use polyester (A) as the raw material of the middle layer, and supply them to 2 machines respectively. After the extruder is melted at 285°C, it is co-extruded with a layer structure of 2 types of 3 layers (surface layer / middle layer / surface layer) on a cooling roll set at 40°C, and allowed to cool and solidify to obtain undrawn Stretch the sheet. Next, after stretching 3.4 times in the longitudinal direction at a film temperature of 85° C. by using the difference in roll rotation speed, one side of the longitudinally stretched film was coated with the coating solution A1 shown in Table 1 below (formation of the first coating layer) ), coated the coating solution B1 on the reverse side (formation of the second coating layer), introduced into a tenter, stretched 4.3 times at 120°C in the transverse direction, and after heat treatment at 225°C...
Embodiment 2～28
[0155] In Example 1, except having changed the coating agent composition to the coating agent composition shown in Table 1, it manufactured similarly to Example 1, and obtained the polyester film. The obtained polyester film is shown in Table 2.
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Abstract
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