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High-transparency multilayer polyester film

A technology of polyester film and high light transmittance, which is applied in the field of polyester film, can solve the problems of difficulty in uniform dispersion of nanoparticles, decrease of light transmittance, and gap in requirements, etc., to improve light transmittance, better effect, and good The effect of opening performance

Inactive Publication Date: 2015-01-07
SHANDONG SNTON OPTICAL MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since particle fillers are usually added to the surface of the polyester film as an anti-blocking agent, the particle size of the anti-blocking agent is generally on the order of microns, which is larger than the wavelength of visible light, which will form reflection and scattering, resulting in a decrease in light transmittance, which is far from the requirements of the above functional films.
[0003] At present, the usual solutions are: one is to use nano-scale opening agent to avoid scattering and reflection, so as to avoid the decrease of light transmittance, but it is difficult for nanoparticles to disperse evenly in polyester

Method used

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  • High-transparency multilayer polyester film
  • High-transparency multilayer polyester film
  • High-transparency multilayer polyester film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as figure 2 As shown, the polyester layer A raw material and the polyester B layer raw material are pre-crystallized and dried at a temperature of about 160°C, and then uniformly transported to different extruders. Among them, the raw material of layer A is polyethylene naphthalate; the raw material of layer B is 100 parts of polyethylene terephthalate (copolymer of terephthalic acid and ethylene glycol) and 0.2wt% SiO 2 (The average particle size is 2 μm).

[0046] In the above-mentioned extruder, the raw material is melted and extruded at a temperature of about 270° C., filtered through a filter, and then extruded from a multi-layer die to obtain a flake melt.

[0047] One side of the above-mentioned sheet-shaped melt is attached to a chilling roller by an electrostatic adsorption device for cooling, and the other side is cooled and solidified by back cooling air to obtain a cast sheet.

[0048] The cast sheet is preheated by a roll with a surface temperature ...

Embodiment 2

[0051] Such as figure 2 As shown, the polyester layer A raw material and the polyester B layer raw material are pre-crystallized-dried at a temperature of about 160°C, and then uniformly transported to different extruders. Among them, the raw material of A layer is polyethylene naphthalate; the raw material of B layer is 100 parts of polyethylene terephthalate (terephthalic acid, isophthalic acid and ethylene glycol copolymer, phthalic acid intermediate The content of phthalic acid is 2%) and 0.2wt% SiO 2 (The average particle size is 2 μm).

[0052] Other steps are identical with embodiment 1.

Embodiment 3

[0054] Such as figure 2 As shown, the polyester layer A raw material and the polyester B layer raw material are pre-crystallized-dried at a temperature of about 160°C, and then uniformly transported to different extruders. Among them, the raw material of A layer is polyethylene naphthalate; the raw material of B layer is 100 parts of polyethylene terephthalate (terephthalic acid, isophthalic acid and ethylene glycol copolymer, phthalic acid intermediate The content of phthalic acid is 3%) and 0.2wt% SiO 2 (The average particle size is 2 μm).

[0055] Other steps are identical with embodiment 1.

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Abstract

The invention discloses a high-transparency multilayer polyester film which has at least three layers and takes high-refractive-index polyester as a core layer, wherein a layer of low-refractive-index polyester or multiple layers of polyesters with sequentially reduced refractive indexes are compounded on one or two surfaces of the core layer. Compared with the prior art, the high-transparency multilayer polyester film has the superiorities that the film does not need to be coated and is high in transparency and good in opening performance, the transparency of a later optical functional film is improved, and the finally used transparency effect or brightness is enhanced; in addition, the film can be coated with one or more layers of coatings with the refractive indexes smaller than those of polyesters, and the effect after the coating process is better.

Description

technical field [0001] The invention relates to a multi-layer polyester film with high light transmittance, and relates to the polyester film used for diffusion, brightening, hardening, protection, ITO, IMD and other functional films. Background technique [0002] Polyester film is widely used as a base material for diffusion, brightening, hardening, protection, ITO, IMD and other functional films because of its high transparency, non-absorption of visible light, good heat resistance, and good mechanical properties. However, since particle fillers are usually added to the surface of the polyester film as an anti-blocking agent, the particle size of the anti-blocking agent is generally on the order of microns, which is larger than the wavelength of visible light, which will cause reflection and scattering, resulting in a decrease in light transmittance, which is far from the requirements of the above functional films. [0003] At present, the usual solutions are as follows: F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36B32B33/00
CPCB32B27/36B32B33/00B32B2307/406B32B2307/412
Inventor 孙艳斌程凡宝周炳阳杨彪宋晓燕
Owner SHANDONG SNTON OPTICAL MATERIALS TECH CO LTD
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