Release film and method of making the same
A manufacturing method and release film technology, applied in chemical instruments and methods, film/sheet release liners, synthetic resin layered products, etc., can solve the problems of poor coating appearance, increased cost of coating raw materials, and poor winding properties Achieve excellent peeling stability, excellent coating appearance, and less change over time
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Embodiment 1
[0152] 20% by weight of the coating liquid 1, 1% by weight of the coating liquid 3, 0.5% by weight of the coating liquid 4, 0.5% by weight of the silicone beads and the balance used as a solvent of water for preparation. In addition, the silicone beads were separately dispersed in absolute ethanol and then mixed to prepare. At this time, the content of absolute ethanol was 10% by weight of the entire coating liquid composition.
[0153] Then, 1000g of dimethyl terephthalate, 576g of ethylene glycol, 300ppm of magnesium acetate and 400ppm of trimethyl phosphate relative to the content of the polyester resin were put into the reactor, and esterification was carried out while methanol was flowing out. exchange reaction. Then, a polycondensation reaction was carried out at 285° C. under a vacuum of 0.3 torr to obtain polyester chips with an intrinsic viscosity of 0.61.
[0154] After the polyester chip was melt-extruded at 280° C., it was quenched at 24° C. with a large roll to...
Embodiment 2 to 9 and comparative example 1 to 3
[0157] As shown in Table 1 below, a release film was produced in the same manner as in Example 1 except that the composition ratio of the coating liquid, the preheating temperature, and the like were changed. The physical properties of the produced release film were measured and shown in Table 2 below.
[0158] Table 1
[0159]
[0160]
[0161] In said Table 1, ET is absolute ethanol, and IPA is absolute isopropanol.
[0162] Table 2
[0163]
[0164] As shown in said Table 2, it can be known that the coating uniformity of the release film manufactured by the present invention is good, and the release force R i as low as 10 or less. In addition, the time-dependent change in release force according to Equation 2 is 20 or less, and the variation in release force according to Equation 3 is 1.2 or less, satisfying all physical properties. In addition, physical properties such as a residual adhesion rate of 90% or more were exhibited, and it was confirmed that there w...
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