High-efficiency light diffusing polymeric film and manufacturing method thereof
A high-efficiency light diffusing polymeric film comprises a first polymer which is a light transmissible medium, and a second polymer which forms light scattering particles, wherein the polymers are immiscible and have a refractive index difference of about 0.001 to about 0.5, and the polymeric film comprises about 30 about to 70 parts by weight of the second polymer with respect to 100 parts by weight of the first polymer. A method for manufacturing a high-efficiency polymeric film is carried out such that a first polymer forms a continuous phase and a second polymer forms a dispersed phase through coating or extrusion.
1. A method for manufacturing a high-efficiency polymeric film comprising:
mixing a first polymer comprising phenoxy resin which is a light transmissible medium, a second polymer comprising acrylic resin which forms light scattering particles, and dipentaerythritol hexaacrylate in a solvent,
preparing a polymeric film by means of coating or extrusion such that the first polymer forms a continuous phase and the second polymer forms a dispersed phase,
evaporating the solvent such that the polymeric film has a turbidity value of about 50 to about 200 Nephelometric Turbidity Units, and
curing the polymeric film under irradiation of UV-ray to prevent additional phase separation of the dispersed phase or the continuous phase and to stabilize a cross-section morphology of the polymeric film,
wherein the first and the second polymers are immiscible and have a refractive index difference of about 0.001 to about 0.5, and
wherein the polymeric film comprises about 30 to about 70 parts by weight of the second polymer with respect to 100 parts by weight of the first polymer, and about 5 to about 95 parts by weight of dipentaerythritol hexaacrylate with respect to 100 parts by weight of the first and the second polymers.
2. The method of claim 1 , wherein the first and the second polymers do not physically mix and phase separate into a continuous phase and a dispersed phase, wherein the dispersed phase has a spherical shape or a substantially spherical shape.
3. The method of claim 1 , wherein the polymeric film further comprises about 0.5 to 10 parts by weight of a photoinitiator with respect to 100 parts by weight of the energy beam-curable low molecular weight acrylate.
4. A light diffusion polymeric film obtained by a method according to claim 1 .