Process for producing white layered film, and white layered polyester film

A manufacturing method, white layer technology, applied in the field of white film, achieves the effect of less quality change and excellent crack resistance

Inactive Publication Date: 2015-04-15
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the backlight must not only irradiate light individually, but also irradiate the entire screen uniformly.

Method used

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  • Process for producing white layered film, and white layered polyester film
  • Process for producing white layered film, and white layered polyester film
  • Process for producing white layered film, and white layered polyester film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0207] The mixture of raw materials shown in Tables 1 to 4 was vacuum-dried at a temperature of 180°C for 3 hours, then supplied to an extruder, melted and extruded at a temperature of 280°C, filtered with a 30 μm cut filter, and then introduced into T mold nozzle.

[0208]Then, it is extruded into a sheet form from a T-die nozzle to form a molten single-layer sheet, and the molten single-layer sheet is adhered to a drum whose surface temperature is kept at 25°C by electrostatic application method for cooling and solidification to obtain Unstretched monolayer film. Then, after preheating the unstretched single-layer film with the roll group heated to 70° C., it was heated from both sides by an infrared heater (output 1.4 kW, distance from the film 15 mm, irradiation time 0.72 seconds). While being irradiated, it was stretched to 3.6 times in the longitudinal direction (longitudinal direction), and cooled with a roll set at a temperature of 25° C. to obtain a uniaxially stretc...

Embodiment 2～31

[0214] A film was prepared in the same manner as in Example 1 according to the film composition, production conditions, and coating liquid composition shown in Tables 1 and 3. Table 5 shows the evaluation results of physical properties.

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Abstract

Provided is a process for producing a white film with excellent low glossiness and productivity. Further, by using the white film, a reflecting member for a surface light source with excellent low glossiness is inexpensively provided. According to the process for producing a white film of the present invention, a white film with low glossiness and good collectability can be produced by an in-line coating application of a coating solution comprising an acrylic binder, a lithium salt, and inorganic particles, followed by stretching in at least one direction and drying to form a coating layer.

Description

technical field [0001] The present invention relates to the improvement of a white film. More specifically, the present invention relates to a white film which is suitable as a reflective member (reflector and reflector) for a surface light source and has low gloss, productivity, and reflective properties. . Background technique [0002] Liquid crystal displays, which are commonly used in information display devices, etc., are equipped with a surface light source called a backlight at the rear of the display to irradiate light in order to ensure high brightness. In addition, the backlight must not only irradiate light individually but also irradiate the entire screen uniformly. As a form satisfying the above-mentioned characteristics, there are structures called side-light type and direct-type surface light source. Among them, for a thin display used in a notebook personal computer or the like, an edge-light type, that is, a backlight of a type that irradiates light from t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/08
CPCG02B2207/113G02B5/3083
Inventor 绪方一正前川茂俊大平贵之高桥弘造
Owner TORAY IND INC
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