Optical film and method for manufacturing same
A technology of optical film and manufacturing method, applied in the direction of optics, optical elements, optical elements, etc., can solve the problems of rainbow spots, retardation (high phase difference, invisible, etc.), achieve cheap manufacturing products, and reduce stretching temperature Effect
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Embodiment 1
[0171] Ethylene-butylene random copolymer (density: 870kg / m 3 , melting point: 55°C, MFR (190°C, 21.18N): 35g / 10min) 900g, silane-modified ethylene-octene random copolymer (density: 868kg / m 3 , melting point: 54°C, MFR (190°C, 21.18N): 1.7g / 10min) 100g, 30g of isobornyl methacrylate as a crosslinking agent, 20g of 1,10-decanediol dimethacrylate, A resin composition 1 was produced by mixing 30 g of a mixture of 2,4,6-trimethylbenzophenone and 4-methylbenzophenone as a photocrosslinking initiator. The melting point of resin composition 1 was 55°C.
[0172] Next, on a polyethylene terephthalate film (referred to as "release PET film"; manufactured by Mitsubishi Plastics Corporation, Diafoil MRA100, thickness: 100 μm) which is a film subjected to release treatment, the aforementioned resin composition 1 was formed into a sheet shape so that the thickness became 150 μm, and a 2-layer optical film laminate was obtained. Furthermore, a release PET film (Mitsubishi Plastics Corpora...
Embodiment 2
[0177] After the resin film 1 obtained in Example 1 was peeled off the release PET film on both sides, it was stretched longitudinally to 1.35 times, and then utilized the same method as in Example 1, using a high-pressure mercury lamp, while irradiating 10 J / cm 2 The UV side is cooled, and the release PET film is coated on both sides of the film again. After aging this at 23° C. and 50% RH for 12 hours, an optical film 2 was obtained by performing heat treatment at 80° C. for 30 minutes using a thermostat.
[0178] The composition and production conditions of the optical film 2 are shown in Table 1, and the physical property evaluation is shown in Table 2.
Embodiment 3
[0180] 900 g of ethylene-butene random copolymer as a basic thermoplastic resin, 100 g of silane-modified ethylene-octene random copolymer, 30 g of isobornyl methacrylate as a crosslinking agent, 1,10-decanedi Resin composition 2 was produced by mixing 20 g of alcohol dimethacrylate and 60 g of a mixture of 2,4,6-trimethylbenzophenone and 4-methylbenzophenone as a photocrosslinking initiator. The melting point of resin composition 2 was 55°C.
[0181] Next, the aforementioned resin composition 2 was molded into a sheet shape so as to have a thickness of 150 μm on a release PET film (Mitsubishi Plastics Corporation, Diafoil MRA100, thickness: 100 μm) to obtain a two-layer optical film laminate. Furthermore, a release PET film (Mitsubishi Plastics Corporation, Diafoil MRF75, thickness: 75 μm) was coated on the optical film laminate to prepare a resin film 2 in which protective films were laminated on both surfaces.
[0182] After peeling off the release PET film on both sides f...
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