Laminated polyester film
一种叠层聚酯膜、聚酯膜的技术，应用在涂层、分层产品、合成树脂层状产品等方向，能够解决成本上升、制造工序增加等问题，达到抗静电性优异、工业价值高的效果
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[0027] 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. That is, it is preferable to obtain an unstretched sheet by cooling and solidifying a molten 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 application 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 t...
Embodiment 1
[0143] Mix the raw materials of polyester (A), (B) and (C) at the ratio of 85%, 5%, and 10% respectively as the raw material of the outermost layer (surface layer), and mix the polyester at the ratio of 95%, 5% respectively. The mixed raw materials of esters (A) and (B) are supplied to two extruders as the raw materials for the middle layer, and after being melted at 290°C, two kinds of three layers (surface layer / intermediate layer / surface layer=1:18:1 discharge rate) layer structure co-extruded, cooled and solidified to obtain an unstretched sheet. Next, using the difference in roll rotation speed, the film was stretched 3.4 times in the longitudinal direction at a film temperature of 85°C. After that, one side of the longitudinally stretched film was coated with the coating liquid 1 shown in Table 1 below, and after drying, it was 0.09. g / m 2 , apply the coating liquid 11 on the opposite side, and let it dry to 0.03g / m 2 , introduced into a tenter, stretched 4.0 times at...
Embodiment 2～8
[0146] In Example 1, except having changed the coating agent composition into the coating agent composition shown in Table 1, it manufactured similarly to Example 1, and obtained the polyester film. Table 2 shows the properties of the obtained polyester film.
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