Highly-transparent optical polyester film and preparation method thereof

Abstract

The invention provides a highly-transparent optical polyester film and a preparation method thereof. The highly-transparent optical polyester film comprises a layer A, a layer B and a layer C which are integrally formed into a three-layer stratified structure, wherein the layer A is a surface layer; the layer B is a sandwich layer; the layer C is a bottom layer; the layer A comprises the following raw materials in percentage by weight: 85-95% of modified polyester for films, and 5-15% of nanometer polymethylpentene particles or nanometer styrene butadiene resin particles; the layer B comprises the following raw materials in percentage by weight: 95-99% of super bright polyester for films and 1-5% of a heat stabilizer; the layer C comprises the following raw materials in percentage by weight: 85-95% of modified polyester for films, and 5-15% of the nanometer polymethylpentene particles or the nanometer styrene butadiene resin particles. Non-transparent anti-bonding particles (an anti-bonding agent) which are commonly used in the prior art need not to be added into the raw materials of the high-transparent optical polyester film, so that the processability of the high-transparent optical polyester film is improved; meanwhile, fogging is avoided, and the light transmittance and the glossiness of the high-transparent optical polyester film are improved.

Description

technical field [0001] The invention relates to an optical polyester film and a preparation method thereof, in particular to a highly transparent optical polyester film and a preparation method thereof, and the highly transparent optical polyester film can be used for protective films in flat panel display screens in the optical field, Reflective film, diffusion film and brightness enhancement film, etc. 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 an...

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Problems solved by technology

Nevertheless, due to the anti-blocking particles (such as SiO 2 , BaSO 4 、TiO 2 ) has a certain difference with the polyester refractive index, and the compatibility with the polyester is not good. Therefore, in the preparation process of the polyester film, with the increase of the content of the above-mentioned anti-blocking particles in the polyester masterbatch chips, not only will it cause The transparency of the polyester film is destroyed, and it will also lead to an increase in the degree of fogging of the polyester film, so that the produced polyester film cannot meet the requirements for the use of optical films

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