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Polyester composition, electronic device and film forming method
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A technology of electronic devices and compositions, applied in the field of polyester compositions, which can solve problems such as thermal deformation of films
Active Publication Date: 2017-03-01
IND TECH RES INST
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The integrated optical film will be closer to the heat source, and the film will be easily deformed by heat under long-term use or in the high-temperature process environment of LCD
Method used
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[0018] In the following examples, polyethylene naphthalate (Polyethylene naphthalate, PEN for short) with a weight average molecular weight of about 35,000 was purchased from Teijin as TN-8065S. Polyethylene terephthalate (PET for short) has a weight average molecular weight of about 37500 and is purchased from Teijin as TR-8550T. The intrinsic viscosity, Tg, and Tm of PEN and PET at 25°C are shown in Table 1.
[0019] In the following examples, 1,3 / 1,4-cyclohexanedimethanol was purchased from Dow Chemical International Co., Ltd. (Dow Chemical Company) UNOXOL TM 34Diol, its trans-1,3-cyclohexanedimethanol accounts for 24%, cis-1,3-cyclohexanedimethanol accounts for 32.8%, trans-1,4-cyclohexanedimethanol accounts for 30.2%, and cis -1,4-cyclohexanedimethanol accounts for 13.0%, that is, the ratio of 1,3-cyclohexanedimethanol to 1,4-cyclohexanedimethanol is 56.8:43.2. The following 1,4-cyclohexanedimethanol was purchased from Tokyo Chemical Industry Co., Ltd. (TCI) C0479, its ...
Embodiment 1
[0028] Take 166g of terephthalic acid (TPA), 129.6g of 1,4-cyclohexanedimethanol (1,4-CHDM), and 14.4 grams of 1,3 / 1,4-cyclohexanedimethanol (1 ,3 / 1,4-CHDM), during the polycondensation reaction, add an antimony acetate catalyst with a content of about 350ppm, carry out the esterification reaction at 240-250°C for about 4 hours, and then carry out the polycondensation reaction at 280-290°C After about 4 hours, after two-stage esterification and polycondensation, polyester PCT-10 was synthesized. Its intrinsic viscosity, Tg and Tm at 25°C are shown in Table 1.
Embodiment 2
[0030] Take 166g of terephthalic acid (TPA), 108g of 1,4-cyclohexanedimethanol (1,4-CHDM), and 36 grams of 1,3 / 1,4-cyclohexanedimethanol (1, 3 / 1,4-CHDM), adding antimony acetate catalyst with a content of about 350ppm during the polycondensation reaction, carrying out the esterification reaction at 240-250°C for about 4 hours, and then carrying out the polycondensation reaction at 280-290°C for about After 4 hours, after two-stage esterification and polycondensation, polyester PCT-25 was synthesized, and its intrinsic viscosity, Tg and Tm at 25°C are shown in Table 1.
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Abstract
The film forming method provided by the present invention includes: providing 50 to 85 weight percent of the first polyester and 50 to 15 weight percent of the second polyester, and blending them into a mixture after drying. The first polyester is polyethylene terephthalate, polyethylene naphthalate, or combinations thereof. The second polyester is composed of 1 molar part of terephthalic acid, m molar parts of 1,4-cyclohexanedimethanol, n molar parts of 1,3-cyclohexanedimethanol, and o molar parts of ethylene dimethanol. Alcohol copolymerization. m+n+o=1, 0≤o≤0.4, 0.6≤m+n≤1, and 0.06≤n / m≤1.31. Melt blending the mixture to form a polyester composition, extruding to form a sheet; biaxially stretching the sheet to form a film; and heat setting the film.
Description
technical field [0001] This invention relates to polyester compositions, and more particularly to films formed therefrom and methods of forming them. Background technique [0002] Generally, displays and various electronic components use transparent glass substrates as base materials. However, with the popularization of electronic products and the increasing dependence on electronic products, it has become a mainstream trend for displays and various electronic components to become lighter and thinner. There is further demand for flexible displays and flexible electronic components with superior performance such as portability, flexibility, wearability, and impact resistance. Although plastic substrates are expected to be used in active displays with flexible substrates, OLED lighting, printed circuit boards, etc., they must overcome problems such as heat resistance, transparency, and dimensional stability. [0003] Taking displays as an example, with the thinning of display...
Claims
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