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Multilayer laminated film

A technology of laminating films and strata, applied in the directions of coatings, layered products, synthetic resin layered products, etc., can solve the problems of optical quality, difficult to achieve high reflectivity, reflectivity reduction and other problems, to achieve suppression of color tone, high The effect of polarization, uniform tone

Active Publication Date: 2021-05-14
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the number of layers that can be stacked is limited, it is difficult to achieve high reflectivity over a wide reflection wavelength range
In addition, increasing the reflectivity of light in only a specific wavelength range may result in a decrease in the reflectivity of light in other reflected wavelength ranges, causing optical quality issues

Method used

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  • Multilayer laminated film
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  • Multilayer laminated film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0161] The polyester A used for the first layer was dried at 170° C. for 5 hours. Then, the polyester B used for the second layer was dried at 85° C. for 8 hours. After that, the polyester A and the polyester B were supplied to the first extruder and the second extruder, respectively, and heated to 300° C. so as to be in a molten state. The polyester used for the first layer was divided into 138 layers, and the polyester used for the second layer was divided into 137 layers. In order to alternately laminate the first layer and the second layer and obtain the layer thickness distribution shown in Table 1, a multilayer feedblock device equipped with comb teeth was used to obtain a melt having a laminated state of 275 layers in total. While maintaining the laminated state, the same polyester as the polyester used for the second layer was introduced from the third extruder toward the three-layer feed block to both sides of the melt to further create a laminated state with 275 lay...

Embodiment 2 to 8 and comparative example 1 to 8

[0164] A uniaxially stretched multilayer laminated film was obtained in the same manner as in Example 1 except that the multilayer feedblock apparatus used was changed so that the layer thickness distribution shown in Table 1 was obtained.

[0165]

[0166] As shown from Table 1, compared with the multilayer laminated film of the comparative example, the multilayer laminated film of the example has a high degree of polarization and a uniform color tone while maintaining a wide reflection wavelength Hue when viewed in that direction.

[0167] The multilayer laminated film according to one embodiment of the present disclosure can achieve high polarization and uniform color tone while maintaining a wide reflection wavelength range by appropriately designing the optical thicknesses of alternately laminated first layers and second layers, and The color tone when viewed from an oblique direction is suppressed. Therefore, when the film is used as a brightness-enhancing member req...

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Abstract

The layer thickness profile of the optical thickness of a first layer has a first monotonically increasing region, the first monotonically increasing region comprises a 1A monotonically increasing region having a maximum optical thickness less than or equal to 100 nm and a 1B monotonically increasing region having a minimum optical thickness greater than 100 nm, and a ratio 1B / 1A of a slope 1B in the 1B monotonically increasing region to a slope 1A in the 1A monotonically increasing region is 0.8 or more but less than 1.5. The layer thickness profile of the optical thickness of a second layer has a second monotonically increasing region, the second monotonically increasing region comprises a 2A monotonically increasing region having a maximum optical thickness less than or equal to 200 nm and a 2B monotonically increasing region having a minimum optical thickness greater than 200 nm, and a ratio 2B / 2A of a slope 2B in the 2B monotonically increasing region to a slope 2A in the 2A monotonically increasing region is more than 1.5 but less than 5.

Description

technical field [0001] The present disclosure relates to a multilayer laminate film that can broadly reflect light in the visible region. Background technique [0002] A multilayer laminated film in which many layers with a low refractive index and many layers with a high refractive index are alternately laminated can be used as an optical interference film that selectively reflects or transmits light having a specific wavelength due to optical interference caused by a layered structure . In addition, by gradually changing the film thickness of each layer in the thickness direction, or by pasting together films having different reflection peaks, such multilayer laminated films can reflect or transmit light in a wide wavelength range, obtaining a film similar to that using metals. as high reflectivity, and used as a metallic gloss film or as a mirror. In addition, it is known that by stretching such a multilayer laminated film in one direction, the multilayer laminated film...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B32B7/023G02B5/28
CPCG02B5/305G02B5/287B32B2255/10B32B2551/00B32B3/263B32B2307/416B32B2307/732B32B2307/708B32B2307/42B32B27/36B32B2250/05B32B2457/202B32B2551/08B32B2250/244B32B2250/24B32B27/08G02F1/133536B32B7/023G02B5/28G02B5/30B32B2307/40B32B2250/42G02B5/3083
Inventor 中川大中西庸介渡部誉之
Owner TOYOBO CO LTD