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Cellulose triacetate film

A technology of cellulose triacetate and cellulose ester film, which is used in instruments, optics, optical components, etc., can solve the problems of polarizer, spectacle lens production, easy precipitation and adhesion to the surface of the film, dark color, etc., and achieves performance Superior, reducing dosage, reducing the effect of high temperature precipitation

Inactive Publication Date: 2019-08-16
CHINA LUCKY FILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The addition of a large number of UV absorbers is not only costly and dark in color, but also easily precipitates and adheres to the surface of the film during high-temperature production, causing troubles for downstream users in the production of polarizers and spectacle lenses

Method used

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  • Cellulose triacetate film

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Embodiment Construction

[0028] Cellulose triacetate film is usually used in two layers when making polarizers and lenses. Common anti-blue light triacetate cellulose film double-layer light transmittance L≥92%, absorption rate at 400nm ≥99.5%, color value b * >5.0. Studies have shown that the color value b * Polarizers and lenses made of cellulose triacetate film >3 have serious color shift, display distortion, and poor comfort. After analysis, the type and amount of UV absorber play a key role in the color value of cellulose triacetate film, and the UV absorber with strong blue light absorption effect will cause the color value of cellulose triacetate film to deepen, while simple The color value of the product can be reduced by reducing the amount of UV absorber, but the blue light absorption rate at 400nm will decrease. In order to balance the contradiction between the color value and the anti-blue light effect, the present invention chooses to mix the white dye containing the large π bond with t...

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Abstract

The invention relates to a cellulose triacetate film. The cellulose triacetate film is prepared from the following components in parts by mass: 60-120 parts of cellulose triacetate, 0.01-0.3 parts ofa white dye, 1.0-5.0 parts of an ultraviolet absorbent, 6-21 parts of a plasticizer and 300-600 parts of a mixed solvent. The blue light-proof cellulose triacetate film has excellent performance, thelight transmittance L of the double-layer film is more than or equal to 93%, and the absorption rate at 400 nm is more than or equal to 99.5%. According to the invention, the double-layer color valueb * of the cellulose triacetate film prepared by adopting the white dye and the ultraviolet absorbent is < 2.0, and the absorption rate at 400 nm of a prepared anti-blue light lens is 100% at 400 nm.The white dye contains a large Pi bond and is mixed with the ultraviolet absorbent to generate a synergistic effect, so that the dosage of the ultraviolet absorbent can be reduced, the production costcan be reduced, and the high-temperature precipitation of the ultraviolet absorbent can be reduced.

Description

technical field [0001] The invention relates to the technical field of cellulose triacetate film, in particular to a cellulose triacetate film for preventing blue light. Background technique [0002] With the development of society, people's dependence on TV, computer, mobile phone, tablet PC and other electronic products in work and life is gradually increasing. At the same time, the blue light emitted by the screen of electronic products will cause harm to human health. Especially the energy of blue light with a wavelength of 400nm-450nm is as high as 6.1-6.7×10 14 Hz, may cause the retina to produce free radicals, lead to the decline of the retinal pigment epithelial cells, and make the photosensitive cells lack nutrients and cause visual impairment. In severe cases, it will lead to serious blinding eye diseases such as macular degeneration and glaucoma. With the improvement of people's awareness of anti-blue light for electronic products, the market demand for anti-blue...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/12C08K5/00C08K5/353C08K5/45C08K5/3472C08K5/3475C08K5/523C08J5/18G02B1/04G02B5/22
CPCC08J5/18C08J2301/12C08K5/00C08K5/3472C08K5/3475C08K5/353C08K5/45C08K5/523C08K2201/014G02B1/04G02B5/223
Inventor 包继甜孙晓龙谢芸张菲吴文涛
Owner CHINA LUCKY FILM CORP
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