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High-transparency thick polyester film

A polyester film, transparent technology, applied in the field of polyester film, can solve the problems of increasing the turbidity of polyester film, increasing the degree of fogging of polyester film, and destroying the transparency of polyester film, achieving high transparency and good chemical resistance , the effect of good dimensional stability

Active Publication Date: 2010-10-06
CHINA LUCKY FILM CORP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of additives destroys the transparency of the polyester film to a certain extent and increases the degree of fogging of the polyester film, which is undesirable in many application fields, especially in the field of optical applications. It is fatal and increases The turbidity of the polyester film, which reduces the clarity of the polyester film
[0004] The Chinese patent application number 02136917.8 discloses a highly transparent polyester film and its production method. The thickness of the film is 6-75 μm, but it is not suitable for biaxially stretched polyester film with a thickness of 125 μm-500 μm, and cannot Applied in the field of displays that require high optical performance

Method used

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  • High-transparency thick polyester film
  • High-transparency thick polyester film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The copolyester containing 1.8% isophthalic acid (accounting for the molar content of the acid in the synthesis) and the polyester masterbatch with an average particle size of 0.007 μm as a silicon dioxide slip agent are chipped, and the average particle size is 0.110 μm. The polyester masterbatch slices and the silica polyester masterbatch slices with an average particle size of 0.250 μm are uniformly mixed, and finally the content of the average particle size of 0.007 μm silica in the total polyester chips is 60PPm, and the average particle size The content of 0.110 μm silica in the total polyester chips is 10PPm, and the average particle size of 0.250 μm silica in the total polyester chips is 10PPm. After mixing these four raw materials, the raw materials used as the core layer (layer B) were crystallized and dried at 160°C, and then the materials were fed into a single-screw extruder for melt extrusion at 275°C.

[0035] The copolyester containing 1.8% isophthalic a...

Embodiment 2～15

[0039] With the preparation method similar to Example 1, according to the layer structure and thickness ratio of the film described in Table 1, the composition of A and B polyester components, the composition, particle size and content of the additives, thick-type high-quality films with different thicknesses were prepared. Clear polyester film.

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Abstract

The invention relates to a high-transparency thick polyester film, the polyester film is obtained by bidirectionally drawing copolyester with low crystallization rate, the thickness of the film is 125 to 500mum, the light transmittance is larger than or equal to 88.0%, the fog density is smaller than or equal to 2.4%, the film contains nanometer-level, sub-nanometer-level and micron-level additives, the micron-level additive accounts for 2 to 50 percent of the gross weight of the additives, and the film has high transparency and good dimensional stability, chemical resistance and processing property and can be widely applied to different industries, particularly a protecting film, a reflecting film, a diffusion film and the like in medium and large flat-plate display screens with higher requirements for optical performance, and films required by films, spray painting, tags and window films.

Description

technical field [0001] The invention relates to a polyester film, in particular to a highly transparent thick polyester film with high transparency, low haze and a thickness of 125 μm to 500 μm. Background technique [0002] Due to its excellent mechanical properties, good dimensional stability, high transparency and chemical resistance, polyester film is widely used in different industries, especially in the protection of medium and large flat panel displays that require high optical performance. film, reflective film, diffusion film, etc. These types of films require polyester films to have high transparency, low haze, good smoothness, and thickness requirements, usually between 38 μm and 300 μm. When producing thick polyester film, due to the high crystallization rate of the polyester used, it is easy to reduce the transparency of the film and increase the haze value, making it unable to meet the requirements of medium and large flat panel displays with high optical perf...

Claims

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Application Information

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IPC IPC(8): C08L67/00C08L67/02C08K3/36C08K3/22C08K3/34C08K3/26C08K3/30C08L33/08C08L25/06B29C55/12
Inventor 高青王旭亮李宇航韩志强霍新莉张希堂
Owner CHINA LUCKY FILM CORP
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