Optical polyester film

Abstract

The invention belongs to the technical field of a polyester film, and specifically belongs to an optical polyester film. The optical polyester film is a multi-layer co-extruded biaxially stretchable film; the surfaces of the two sides of a middle layer are each provided with a surface layer; the middle layer is made of polyethylene terephthalate (PET); each surface layer is composed of polyethylene terephthalate added with nano Al2O3 and an antistatic agent; the content of the nano Al2O3 in the surface layer is 5 wt% to 8 wt%; the content of the antistatic agent in the surface layer is 2 wt% to 3 wt%; the thickness of the surface layer is 3.5 micrometers; the thickness of the middle layer is 12-200 micrometers; the prepared optical polyester film provided by the invention has good surfaceproperties; the optical properties are not affected; and meanwhile the film is high in structural strength and long in service life.

Description

technical field

[0001] The invention belongs to the technical field of polyester film, in particular to an optical polyester film. Background technique

[0002] Polyester film has excellent mechanical properties, dimensional stability, chemical resistance and electrical insulation, and has been widely used in different fields such as packaging, electronic appliances, and optics. In the optical field, polyester films have been widely used in protective films, reflective films, diffusion films and brightness enhancement films in flat panel displays. The polyester film used for flat panel displays usually has high requirements on optical properties, such as the light transmittance of the diffusion film and the brightness enhancement film are usually required to be higher than 90%, and the haze is lower than 2.0; relatively speaking, the protective film The light transmittance is generally required to be higher than 94%, and the haze is lower than 1. The surface of the film in...

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