Optical polyester film

Abstract

The invention discloses an optical polyester film which comprises a surface layer, a PET (Polyethylene Terephthalate) membrane layer and a bottom layered structure, wherein the surface layer is composed of 85-95% of a membrane modified polyester and 5-15% of nano-grade butylbenzene resin particles; a TAC (Triacetyl Cellulose) layer made of TAC, a silane coupling agent, a solvent and a plasticizeris arranged on each one of both surfaces of the PET membrane layer; the bottom layer is composed of 85-95% of the membrane modified polyester and 5-15% of the nano-grade butylbenzene resin particles.Due to a composite membrane technique of PET and TAC, the problem of production difficulties of a TAC structure can be alleviated, thinning production of a TAC membrane can be achieved, the flatness of a product surface can be improved, original properties of the TAC membrane can be maintained, and meanwhile, due to addition of the silane coupling agent, a permeation improvement effect of a membrane material can be improved, and hydrophobic properties and long-lasting optical permeation improvement effects of the membrane material can be improved.

Description

Technical field [0001] The invention relates 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 packaging, electronics, optics and other fields. In the field of optics, polyester films have now begun to be 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 performance. For example, the light transmittance of diffusion film and brightness enhancement film is usually required to be higher than 90%, and the haze is lower than 2.0; relatively speaking, the protective film The light transmittance is usually required to be higher than 94%, and the haze is lower than 1. [0003] In the production process of ordinary ...

AI Technical Summary

Problems solved by technology

However, due to the difference in the refractive index between the anti-blocking particles (such as SiO2, BaSO4, TiO2) contained in the polyester masterbatch chips and the polyester, and the poor compatibility with the polyester, the polyester film During the preparation process, as the content of the above-mentioned anti-blocking particles in the polyester masterbatch chips increases, not only the transparency of the polyester film will be damaged, but also the degree of fogging of the polyester film will increase, so that the produced polyester film cannot Meet the use requirements of optical film