Contact lenses

Abstract

To provide contact lenses that have high visible light transmittance while sufficiently blocking light in the yellow wavelength range. [Solution] A contact lens comprising a tetraazaporphyrin compound selected from the group consisting of copper, palladium, and zinc as the central metal, wherein the content of the tetraazaporphyrin compound is 0.015 to 0.50 parts by mass per 100 parts by mass of the main components of the contact lens, and in the light transmission spectrum, the minimum value of light transmittance in the wavelength range of 560 to 650 nm is included in the wavelength range of greater than 585 nm and less than or equal to 620 nm, and the minimum value of said light transmittance is 80% or less.

Description

【Technical Field】 【0001】 The present invention relates to contact lenses. 【Background Art】 【0002】 Contact lenses having a function of absorbing (cutting) light rays in a specific wavelength band have been developed. For example, Patent Document 1 discloses a compound that absorbs ultraviolet rays and high-energy visible light and a contact lens using the same. Contact lenses that cut yellow light for the purpose of suppressing glare and the like are desired, but there has been a concern that not only yellow light but also other visible lights are largely cut, impairing the visual transmittance. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Tokuhyo 2021-515762 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 An object of the present invention is to provide a contact lens having a high visual transmittance while sufficiently cutting light in the yellow wavelength band. 【Means for Solving the Problems】 【0005】 As a result of intensive studies by the present inventors, it has been found that the above problems can be solved by using a specific amount of a compound having a specific structure in a contact lens, and the present invention has been completed. According to the present invention, the following contact lenses and the like are provided. 1. A contact lens containing a tetraazaporphyrin-based compound selected from the group consisting of copper, palladium, and zinc as a central metal, where the content of the tetraazaporphyrin-based compound is 0.015 to 0.50 parts by mass with respect to 100 parts by mass of the main constituent of the contact lens, In the light transmission spectrum, the minimum light transmittance in the wavelength range of 560-650 nm falls within the wavelength range of over 585 nm and up to 620 nm, and the minimum light transmittance in that range is 80% or less. Contact lenses. 2. The contact lens according to claim 1, wherein the central metal of the tetraazaporphyrin compound is copper or palladium. 3. The contact lens according to claim 1 or 2, wherein the central metal of the tetraazaporphyrin compound is copper. 4. A contact lens according to any one of 1 to 3, wherein the content of the tetraazaporphyrin compound is 0.015 to 0.10 parts by mass per 100 parts by mass of the main components of the contact lens. 5. Contact lenses containing a UV absorber, as described in any of items 1-4. 6. Contact lenses listed in any of items 1-5, with a visible light transmittance of 80% or higher. A contact lens according to any one of 1 to 6, wherein it does not have an absorption peak in the wavelength range of 7.380 to 530 nm and has an average light transmittance of 80% or more in the said wavelength range. A contact lens according to any one of 1 to 7, wherein it does not have an absorption peak in the wavelength range of 8.640 to 780 nm and has an average light transmittance of 80% or more in the said wavelength range. [Effects of the Invention] 【0006】 According to the present invention, it is possible to provide a contact lens that has high luminous transmittance while sufficiently cutting out light in the yellow wavelength range. [Brief explanation of the drawing] 【0007】 [Figure 1] This is the light transmission spectrum of the contact lens manufactured in Example 1. [Modes for carrying out the invention] 【0008】 The contact lenses of the present invention will be described in detail below. In this specification, unless otherwise specified, "x~y" represents a numerical range of "x or greater, and y or less." The upper and lower limits specified for the numerical range can be combined in any way. Furthermore, it is possible to combine two or more non-conflicting embodiments of the embodiments of the present invention described below, and an embodiment that combines two or more embodiments is also an embodiment of the embodiments of the present invention. 【0009】 A contact lens according to one aspect of the present invention (hereinafter also referred to as "contact lens 1") contains a tetraazaporphyrin compound selected from the group consisting of copper, palladium, and zinc as the central metal, and the content of the tetraazaporphyrin compound is 0.015 to 0.50 parts by mass per 100 parts by mass of the main components of the contact lens. Furthermore, in the light transmission spectrum, the minimum value of light transmittance in the wavelength range of 560 to 650 nm is included in the wavelength range of over 585 nm and up to 620 nm (mainly yellow light), and the minimum value of light transmittance is 80% or less. With the above configuration, contact lens 1 sufficiently cuts out light in the yellow wavelength range, and by using a material that exhibits sharp absorption characteristics in the wavelength range of 560 to 650 nm, it exhibits high visible light transmittance (visible light transmittance). As a result, glare can be reduced without compromising brightness, and a vivid field of vision with high contrast can be provided to the wearer. The following describes contact lenses 1. 【0010】 (Tetraazaporphyrin compounds) The tetraazaporphyrin compounds used in the present invention are specifically metal complex compounds containing a tetraazaporphyrin structure, and include copper (Cu), palladium (Pd), or zinc (Zn) as the central metal. When used in the present invention, the compound is useful not only for its ability to sufficiently cut out light belonging to the yellow wavelength band while maintaining high transmittance of visible light, but also for its high dispersibility in polymer materials and high resistance to heat and ultraviolet light. In other words, since the manufacturing process of contact lenses includes polymerization and sterilization processes using heat and ultraviolet light, the components used need to be resistant to heat and ultraviolet light while dispersed in the contact lens. The above-mentioned tetraazaporphyrin-based compound satisfies these characteristics and can therefore be sufficiently effective in practical use. 【0011】 In one embodiment, the central metal of the tetraazaporphyrin compound is copper (Cu) or palladium (Pd). In one embodiment, the central metal of the tetraazaporphyrin compound is copper (Cu). 【0012】 The amount of the tetraazaporphyrin compound in contact lens 1 is 0.015 to 0.50 parts by mass per 100 parts by mass of the main components of the contact lens. Within this range, it is possible to sufficiently cut out light in the yellow wavelength band while maintaining a high transmittance of visible light. Furthermore, while the approval standards for contact lenses (Ministry of Health, Labour and Welfare, specifically "Regarding the Revision of the Approval Standards for Contact Lenses (Part 2) (Pharmaceuticals and Medical Affairs Bureau Notification No. 0411-8, April 11, 2019)," "4.6 Luminous Transmittance") require a luminous transmittance of 80% or higher, even products with a luminous transmittance of less than 80% can be expected to be sufficiently practical for outdoor sports use, for example, due to the characteristics of contact lenses 1 that can selectively cut out yellow light, which is the main cause of glare. 【0013】 In one aspect, the content of the tetraazaporphyrin-based compound in the contact lens 1 may be 0.015 parts by mass or more, 0.020 parts by mass or more, 0.030 parts by mass or more, 0.040 parts by mass or more, or 0.050 parts by mass or more with respect to 100 parts by mass of the main constituent. Also, in one aspect, it may be 0.50 parts by mass or less, 0.40 parts by mass or less, 0.30 parts by mass or less, 0.20 parts by mass or less, 0.10 parts by mass or less, 0.090 parts by mass or less, or 0.080 parts by mass or less with respect to 100 parts by mass of the main constituent. The content of the tetraazaporphyrin-based compound in the contact lens 1 may be, for example, 0.015 to 0.10 parts by mass, 0.030 to 0.090 parts by mass, or 0.050 to 0.080 parts by mass with respect to 100 parts by mass of the main constituent. Note that the content (content ratio) of the tetraazaporphyrin-based compound and other additives in the contact lens 1 is a numerical value (parts by mass) with the main constituent being 100 parts by mass at the time of raw material preparation. The main constituent is the component as described in "Question and Answer Collection (Q&A) Regarding the Approval Criteria for Contact Lenses" (No. 0330, March 30, 2011), "Method of Indicating Component Quantities", "A4", and indicates the raw material monomers and cross-linking agents that constitute the raw material polymer. The additive indicates components such as a polymerization initiator, a tetraazaporphyrin-based compound, and (other components, etc.) described later, which do not form part of the raw material polymer. 【0014】 (The material constituting the contact lens) The material constituting the contact lens 1 is not particularly limited, and materials used in conventional contact lenses can be adopted. As the material, a polymer material is preferable, and examples include, but are not limited to, hydrogel materials and silicone hydrogel materials, and general contact lens materials can be used. 【0015】 (Other components, etc.) The contact lens 1 may contain an ultraviolet absorber. Known materials can be used as the ultraviolet absorber, for example, benzophenone-based ultraviolet absorbers and benzotriazole-based ultraviolet absorbers. The wavelength of ultraviolet light is usually 380 nm or less. An ultraviolet absorber with little absorption in the visible light region of 380 to 780 nm is desirable. Also, the ultraviolet absorber may have a maximum absorption wavelength in the range of 330 to 350 nm, or may have a maximum absorption wavelength outside the range of 330 to 350 nm. In one aspect, the contact lens 1 does not use an ultraviolet absorber with a maximum absorption wavelength in the range of 330 to 350 nm. 【0016】 It is preferable to employ an ultraviolet absorber that more selectively absorbs ultraviolet light and has little absorption of visible light in the contact lens 1, because it can efficiently cut yellow light and ultraviolet light while maintaining a high visible light transmittance. The addition amount of the ultraviolet absorber is usually 0.1 to 2.0 parts by mass with respect to 100 parts by mass of the main constituent component of the contact lens 1. 【0017】 Also, within a range not impairing the effects of the present invention, components that absorb specific visible light other than the above-described tetraazaporphyrin-based compounds may be added. Examples of such absorption materials include colorants that cut blue light (usually light with a wavelength of 380 to 500 nm). 【0018】 Other additives and the like may be added to the contact lens 1 within a range not inhibiting the effects of the present invention. 【0019】 The manufacturing method of the contact lens 1 is not particularly limited. For example, a monomer component corresponding to the polymer component constituting the lens, a crosslinking agent, a polymerization initiator, a tetraazaporphyrin-based compound, and other additives are mixed to prepare a polymerizable lens composition, and the contact lens 1 can be manufactured by a mold manufacturing method or the like. 【0020】 Contact lens 1 may or may not contain other components in addition to its main components (polymer components), tetraazaporphyrin compounds, and UV absorbers. Contact lens 1 contains 90% or more by mass, 95% or more by mass, 98% or more by mass, 99% or more by mass, 99.5% or more by mass, 99.9% or more by mass, or 100% by mass. Major constituent components, and tetraazaporphyrin compounds, Main components: tetraazaporphyrin compounds and UV absorbers That's fine. 【0021】 (Light transmission (absorption) characteristics) Contact lens 1, in its transmission spectrum showing the relationship between light wavelength and light transmittance, has a minimum light transmittance in the wavelength range of 560-650 nm located in the wavelength range of over 585 nm and up to 620 nm. Furthermore, the minimum light transmittance in this range is 80% or less. This allows for selective and sufficient blocking of light in the yellow wavelength band. In addition, the lens has a bluish tint (e.g., bluish-purple), resulting in a color similar to commonly available contact lenses that are colored for visibility, thus not compromising the appearance when worn. In the case of lenses that primarily block light on the shorter wavelength side, for example, around 575 nm, the lens may have a reddish tint (e.g., reddish-purple), which may cause discomfort to others who see the wearer. 【0022】 The transmission spectrum of contact lens 1 will be described with reference to the example in Example 1 (Figure 1). In the transmission spectrum of Example 1, the minimum value of light transmittance in the wavelength range of 560 to 650 nm is located at a light wavelength of 590 to 595 nm, and this minimum value of light transmittance is approximately 32% (light cut rate: approximately 68%). 【0023】 In one embodiment, the minimum value of the light transmittance is located in a wavelength range of over 585 nm and 610 nm or less, or over 585 nm and 600 nm or less. In one embodiment, the minimum value of the light transmittance may be 70% or less, 60% or less, 50% or less, or 40% or less. 【0024】 In the wavelength range of 560 to 650 nm of the light transmission spectrum, there may be one or more absorption peaks, but preferably one. This makes it possible to cut out light in this wavelength range more selectively and effectively. Example 1 is an example in which there is one absorption peak in the wavelength range of 560 to 650 nm. 【0025】 In one embodiment, the full width at half maximum (FWHM) of the absorption peak in the 560-650 nm wavelength range of the light transmission spectrum is 50 nm or less. This indicates that light in this wavelength range can be cut more selectively. The light transmission spectrum obtained in Example 1 satisfies this characteristic. The FWHM may be, for example, 35 nm or less or 30 nm or less. 【0026】 Furthermore, while there are no particular restrictions on the absorption characteristics of the light transmission spectrum of contact lens 1 other than those mentioned above, it may have the following features. In one embodiment, there is no absorption peak in the wavelength range of 380 to 530 nm, and the average light transmittance in this wavelength range is 80% or more (preferably 85% or more or 90% or more). This wavelength range is a light region where human visual sensitivity is high and contributes significantly to luminous transmittance; therefore, exhibiting the above transmittance can further improve luminous transmittance. Note that Example 1 is an example that exhibits the above transmittance characteristics. In one embodiment, there is no absorption peak in the wavelength range of 650 to 780 nm, and the average light transmittance in that wavelength range is 80% or more (preferably 85% or more or 90% or more). Example 1 is an example that shows the above transmittance characteristics. With the above configuration, it is possible to create a contact lens that sufficiently transmits visible light other than yellow light, ensuring a brighter field of vision. 【0027】 Light transmittance is measured using an ultraviolet-visible spectrophotometer (for example, an ultraviolet-visible spectrophotometer manufactured by JASCO Corporation). 【0028】 The luminous transmittance of contact lens 1 is, for example, 60% or more, 65% or more, 70% or more, 75% or more, or 80% or more. As mentioned above, a higher luminous transmittance is preferable for everyday use, but for other specific uses (for example, certain sports or occupations), it is conceivable that the yellow light cut rate may take precedence over luminous transmittance. Luminous transmittance is measured in accordance with JIS T 7333:2018 "7.3 Luminous Transmittance". 【0029】 (Contact lens shape, use, etc.) There are no particular restrictions on the shape or size of contact lens 1. The diameter of contact lens 1 (value when viewed from above) is, for example, 7 to 17 mm. The thickness (center thickness) of contact lens 1 is, for example, 0.03 to 0.15 mm, but it varies depending on whether or not it has a prescription, so it should be set appropriately considering the light transmittance in the wavelength range of 560 to 650 nm. 【0030】 There are no restrictions on the use of contact lens 1; it can be applied to all types of contact lenses, including those for nearsightedness, farsightedness, astigmatism, and multifocal lenses. It can also be used with prescription lenses or non-prescription lenses. There are no particular restrictions on the frequency of disposability; for example, they may be daily disposable, monthly replacement, or two-week replacement types. [Examples] 【0031】 The following describes embodiments of the present invention, but the present invention is not limited to these embodiments. 【0032】 Example 1 A polymerizable lens composition was prepared by mixing monomers (monomer materials corresponding to the polymer materials constituting the lens, high-water-content lens material, hereinafter also simply referred to as lens material "A"), a tetraazaporphyrin compound (FDG-007 manufactured by Yamada Chemical Industries, Ltd., central metal: copper, hereinafter also simply referred to as "P1"), an ultraviolet absorber (benzophenone-based, hereinafter also simply referred to as ultraviolet absorber "UV1"), a crosslinking agent, and an initiator. The amount of tetraazaporphyrin compound added was 0.09 parts by mass per 100 parts by mass of the total of the main components (lens material A and crosslinking agent). 【0033】 Next, contact lenses were obtained using the polymerizable lens composition by a molding process. The light transmission characteristics of the obtained contact lenses were evaluated using the measurement method described above. The results are shown in Table 1 and Figure 1. Note that "590-595nm" indicates that a peak was observed in the range above 590nm and below 595nm. The same applies to "585-590nm" in Examples 2 and later. 【0034】 Examples 2-6, Comparative Examples 1-3 Contact lenses were manufactured and evaluated using the same method as in Example 1, except that the lens material and the type and amount of tetraazaporphyrin compound were changed as shown in Table 1. The results are shown in Table 1. Lens material B: Monomer (a component that forms the lens material, a low-water content lens material) • Tetraazaporphyrin compound P2: "FDG-005" manufactured by Yamada Chemical Industries, Ltd., central metal: palladium • UV2 UV absorber: Benzotriazole-based 【0035】 [Table 1]

Claims

[Claim 1] A contact lens comprising a tetraazaporphyrin compound whose central metal is selected from the group consisting of copper, palladium, and zinc, The content of the tetraazaporphyrin compound is 0.015 to 0.50 parts by mass per 100 parts by mass of the main components of the contact lens. In the light transmission spectrum, the minimum light transmittance in the wavelength range of 560 to 650 nm falls within the wavelength range of over 585 nm and up to 620 nm, and the minimum light transmittance is 80% or less. Contact lenses (excluding contact lenses containing polymers obtained by copolymerizing an organic dye having yellow light absorption ability with one or more polymerizable monomers, wherein the polymerizable monomers include one or more selected from acrylamide monomers and vinyl monomers). [Claim 2] The contact lens according to claim 1, wherein the central metal of the tetraazaporphyrin compound is copper or palladium. [Claim 3] The contact lens according to claim 1 or 2, wherein the central metal of the tetraazaporphyrin compound is copper. [Claim 4] The contact lens according to claim 1 or 2, wherein the content of the tetraazaporphyrin compound is 0.015 to 0.10 parts by mass per 100 parts by mass of the main components of the contact lens. [Claim 5] A contact lens according to claim 1 or 2, comprising an ultraviolet absorber. [Claim 6] A contact lens according to claim 1 or 2, wherein the visible light transmittance is 80% or more. [Claim 7] The contact lens according to claim 1 or 2, wherein it does not have an absorption peak in the wavelength range of 380 to 530 nm, and the average light transmittance in the said wavelength range is 80% or more. [Claim 8] A contact lens according to claim 1 or 2, wherein it does not have an absorption peak in the wavelength range of 640 to 780 nm, and the average light transmittance in the said wavelength range is 80% or more.

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