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Process for producing melanin, melanin produced by the process, functional film containing the melanin, and process for producing the same

A manufacturing method and technology of melanin, applied in the direction of organic dyes, polarizing elements, etc., can solve problems such as inability to specify structures, and achieve the effects of improving heterogeneity, improving variation, and good dyeing properties

Inactive Publication Date: 2008-07-30
艾坶基希薄膜株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, it is known that the generated melanin is an amorphous three-dimensional polymer with high heterogeneity, and its structure cannot be specified, and the heterogeneity of the product is determined by the number of active sites of the melanin precursor and reaction intermediate ( The following non-patent literature 1)

Method used

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  • Process for producing melanin, melanin produced by the process, functional film containing the melanin, and process for producing the same

Examples

Experimental program
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Effect test

Embodiment 1

[0087] In a 1-liter reactor equipped with a stirrer and an overflow, 200 g / L of catechol and 500 g / L of sodium persulfate were supplied at a rate of 2.7 mL / min, respectively. Use 100g / L sodium hydroxide to adjust the pH value to 9.5±0.2, and control the reaction temperature at 35°C±0.1°C. The overflowed reaction solution was adjusted to pH 1 with hydrochloric acid. The precipitated melanin was filtered and washed with a 50 g / L aqueous solution containing sodium sulfate until the pH value after washing reached 6. The washed melanin was dried at 70° C. for 1 day. The obtained melanin was dissolved in an aqueous solution whose pH was adjusted to 8.3 with ammonia water to a concentration of 1.2 g / L. The polarizing film was immersed in the melanin aqueous solution adjusted to 30° C. for 3 minutes in a tense state. Keeping it taut, take out the polarizing film and let it dry.

[0088] The above-mentioned polarizing film was produced according to the method described in Japanese ...

Embodiment 2 and 3

[0091] Under the same conditions as in Example 1, the melanin according to the present invention was produced twice, and polarizing films were produced using the melanin (Examples 2 and 3). Included in Table 1 together with previous results, which were reproducible well.

[0092] [Table 1]

[0093] Table 1

[0094] Example

Embodiment 4

[0096] In the reaction of embodiment 1, except that the concentration is that the catechol of 200g / L is changed into the dopamine (4-(2-aminoethyl)-catechol) that concentration is 139g / L, with implementation The same reaction was carried out in Example 1, and the same polarizing film treatment as in Example 1 was performed with the obtained melanin.

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Abstract

Provided are a melanin having excellent dyeability on a functional film, and good reproducibility and storage stability, and a method for producing the same. In addition, it also provides a melanin-containing functional film which contains the melanin of the present invention, improves the fluctuation of melanin, and has excellent performance in protecting eyes from ultraviolet rays, and a production method thereof. The method for producing melanin according to the present invention includes at least an oxidation reaction step of continuously oxidizing the above-mentioned melanin precursor while maintaining a constant molar ratio of the melanin precursor to an oxidizing agent in an alkaline aqueous solution, and after the oxidation reaction step The reaction liquid becomes acidic and the precipitation process of melanin is precipitated. In addition, the method for producing a functional film containing melanin of the present invention includes at least a step of treating the film with an alkaline aqueous solution containing the melanin, and a step of treating the film treated with the alkaline aqueous solution with an aqueous solution containing an inorganic salt.

Description

technical field [0001] The present invention relates to a melanin and a method for producing the same, and specifically relates to a melanin having excellent dyeability on a functional film, reproducibility, and storage stability, and a method for producing the same. In addition, the present invention also relates to a functional film containing melanin and a method for producing the same. Specifically, it refers to a functional film containing melanin of the present invention that has improved the variation of melanin contained in the functional film and is superior in protecting eyes from ultraviolet rays. Thin films and methods for their manufacture. Background technique [0002] We know that melanin exists widely in the animal and plant kingdoms, and it can prevent the oxidation of eyes and skin by absorbing ultraviolet rays. Therefore, using the properties of melanin, it is expected to develop a functional film containing melanin that can protect eyes from ultraviolet ...

Claims

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Application Information

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IPC IPC(8): C09B69/10C08J5/18C08J7/02G02B5/30
Inventor 河合良三青木良行高桑恭平並木雅彦
Owner 艾坶基希薄膜株式会社
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