WO2018008179A1

WO2018008179A1 - Eyeglass material

Info

Publication number: WO2018008179A1
Application number: PCT/JP2017/006187
Authority: WO
Inventors: 忠史鳥居
Original assignee: 伊藤光学工業株式会社
Priority date: 2016-07-06
Filing date: 2017-02-20
Publication date: 2018-01-11
Also published as: JPWO2018008179A1

Abstract

The present invention addresses the problem of providing an eyeglass material which can suppress yellowing thereof and graylevel differences in gradation of color caused by the difference in thicknesses of the inner and outer peripheries thereof even when an eyeglass material contains an ultraviolet absorbent having a high cut rate against blue light. In this eyeglass material in which a functional resin layer 15 is integrated with one surface or both surfaces of an organic glass substrate 11 which is a resin molded body, the functional resin layer 15 contains an ultraviolet absorbent having an absorbing peak wavelength of 320 nm or longer and a thickness smaller than the organic glass substrate 11. Therefore, the eyeglass material can have a yellowness (Y1) of less than 10.

Description

Glasses material

The present invention relates to an eyeglass material containing an ultraviolet absorber.

UV rays may cause cataracts and macular degeneration when in the eyes. For this reason, the eyeglass material is preferably one that can reduce the transmission of ultraviolet rays entering the eye.

Conventional eyeglass materials can reduce the transmission of ultraviolet rays by blending an organic glass substrate (base lens) with an ultraviolet absorber.

In the eyeglass materials described in Patent Documents 1 and 2, ultraviolet light transmission can be reduced by blending an ultraviolet absorber having a specific chemical structure.

Further, in the resin lens manufacturing method described in Patent Document 3, a cavity for molding a functional resin layer is formed on one side or both sides of a base lens, and a thermoplastic elastomer is formed on a molding side of the functional resin layer of the base lens. This is a manufacturing method in which a base lens and a functional resin layer are integrated. In the resin lens manufactured by this manufacturing method, the functional resin layer contains a specific wavelength absorber or the like, so that transmission of a specific wavelength or the like can be reduced.

Japanese Patent No. 3868683 Japanese Patent No. 4149068 Japanese Patent Laid-Open No. 2014-156067

In recent years, light with a wavelength of 400 to 500 nm (blue light) in visible light is intense light that reaches the retina of the eyeball. If the eye is exposed to blue light for a long time, it affects the eyes and biological rhythm. It has been known.

There are various ultraviolet absorbers having different absorption peak wavelengths, and some ultraviolet absorbers having an absorption peak wavelength on the long wavelength side have a high blue light cut rate. By using such an ultraviolet absorber, the eyeglass material can cut blue light.

However, an ultraviolet absorber having a high blue light cut rate has an absorption peak wavelength on the long wavelength side, and therefore, when it is contained in a spectacle material, the spectacle material is yellowed (colored or discolored yellow). was there. Yellowed eyeglass materials are not preferred as eyeglass materials because they are reminded of UV-degraded resin. In many cases, the eyeglass material is a lens with a degree, and the difference in thickness between the inner and outer circumferences causes a difference in color tone, which may cause a problem in appearance.

In the eyeglass materials described in Patent Documents 1 and 2, it is possible to reduce the transmission of ultraviolet rays by blending a conventional ultraviolet absorber having a specific chemical structure, but the absorption peak wavelength of the ultraviolet absorber is long. Since it is not on the wavelength side, the problem that the eyeglass material is yellowed hardly occurs. However, when an ultraviolet absorber having an absorption peak wavelength having a high blue light cut rate and a long wavelength side is blended with the eyeglass materials described in Patent Documents 1 and 2, there is a problem that the eyeglass material is yellowed. Further, since the eyeglass material is a product obtained by molding a lens (semi-finished product) and then cutting and polishing to the prescription power of the customer, the eyeglass material described in Patent Documents 1 and 2 has a corresponding portion of the lens at the time of cutting. At the same time, expensive UV absorbers added at the same time were discarded, which was uneconomical.

In addition, when an adhesive layer is interposed between the base lens and the functional resin layer as described in Patent Document 3, it is necessary to apply an adhesive to the organic glass base, which increases the number of manufacturing steps. Easy to see. Further, depending on the material and thickness of the adhesive layer, there is a possibility that refraction abnormality or color unevenness may occur. Furthermore, it has not been actively studied that a functional resin layer is blended with an ultraviolet absorber having an absorption peak wavelength with a high blue light cut rate on the long wavelength side.

The present invention has been made in view of the above points, and even if the spectacle material contains an ultraviolet absorber with a high cut rate of blue light, the yellowing of the spectacle material is suppressed and the thickness of the inner and outer circumferences of the spectacle material is reduced. An object of the present invention is to provide a spectacle material capable of suppressing a difference in color tone caused by a difference.

The eyeglass material of the present invention is an eyeglass material in which a functional resin layer is integrated on one side or both sides of an organic glass substrate that is a resin molded body, and the functional resin layer has an absorption peak wavelength of 320 nm or more. It contains an ultraviolet absorber, and the eyeglass material has a yellowness (YI) of less than 10.

According to the spectacle material of the present invention, since the ultraviolet absorber has an absorption peak wavelength of 320 nm or more, the spectacle material of the present invention can cut blue light (400 to 500 nm). Further, the eyeglass material of the present invention can have a yellowness (YI) of less than 10 by containing an ultraviolet absorber in a functional resin layer that is thinner than an organic glass substrate, Compared with the case where the ultraviolet absorbent is contained in the entire organic glass substrate, yellowing of the spectacle material can be suppressed, and a difference in color tone resulting from a difference in thickness between the inner and outer periphery of the spectacle material can be suppressed.

Here, the ultraviolet absorber having an absorption peak wavelength of 320 nm or more is a benzotriazole ultraviolet absorber, and the content of the ultraviolet absorber in the functional resin layer is 0.1 to 3.0% by mass. There can be. According to this, it is possible to reduce the average transmittance of light in the ultraviolet region (280 to 400 nm) while cutting blue light.

In the eyeglass material of the present invention, the functional resin layer may contain a specific wavelength absorber having an absorption peak wavelength in a wavelength range of 400 to 500 nm. According to this, since the specific wavelength absorber can cut blue light, the spectacle material can cut blue light more.

Also, the cut rate of light with a wavelength of 420 nm can be 20% or more. According to this, the influence of the eyeglass material of the present invention on the user's eyes and biological rhythm can be reduced.

The organic glass substrate is molded from a thiourethane, episulfide or (meth) acrylate thermosetting resin material, and the functional resin layer is a thiourethane, episulfide or (meth) acrylate. It can be formed of a thermosetting resin raw material. According to this, the thiourethane-based, episulfide-based or (meth) acrylate-based thermosetting resin raw material is a resin excellent in adhesiveness with the thiourethane-based, episulfide-based or (meth) acrylate-based thermosetting resin material. Since it is a raw material, the functional resin layer can be adhered to the organic glass substrate without requiring a primer or an adhesive.

Also, the functional resin layer may have a thickness of 0.2 to 3.0 mm. According to this, since the thickness of the cavity for molding the functional resin layer is secured, cast molding can be performed instantaneously, and the injected functional resin layer is cured without uneven curing. Therefore, the spectacle material can suppress the occurrence of striae (parts having different refractive indexes).

It is a figure which shows the manufacturing process of the spectacles material of this invention.

Hereinafter, an embodiment of the present invention will be described. In the eyeglass material of the embodiment, in the eyeglass material in which the functional resin layer 15 is integrated on one side or both sides of the organic glass base material 11 (base lens) that is a resin molded body, the functional resin layer 15 includes: It contains an ultraviolet absorber having an absorption peak wavelength of 320 nm or more, and the eyeglass material has a yellowness (YI) of less than 10.

In the spectacle material of the embodiment, as shown in FIG. 1, an example in which the functional resin layer 15 is integrated with the surface (convex surface) of the organic glass substrate 11 as a spectacle lens by casting is described. . Of course, the present invention is not limited to the use of spectacle lenses, but can be applied to any optical element such as telescope lenses, window glass for architectural or vehicle use. Moreover, the functional resin layer 15 of this invention is not limited to the use to the surface (convex surface) of the organic glass base material 11, The back surface (concave surface) or both surfaces (convex surface and concave surface) of the organic glass base material 11 It is possible to apply to.

The organic glass base material 11 is used as a base material for optical elements such as lenses and window glasses. The eyeglass material of the embodiment is made of organic glass (plastic) because it is lighter than inorganic glass. Shall.

As the organic glass substrate 11, polycarbonate (PC), polyurethane, polyurea, aliphatic allyl carbonate, aromatic allyl carbonate, polythiourethane, episulfide, (meth) acrylate, transparent polyamide (transparent Nylon), norbornene, polyimide, polyolefin, and other synthetic resins can be used.

The thiourethane resin is a polymer (resin) having a bond (-NHCOS-, -NHCSO-, -NHCSS-) in which at least one oxygen atom of a polyurethane bond (-NHCOO-) is replaced with a sulfur atom. means. As the resin material, one or more selected from polyisocyanate, polyisothiocyanate, polyisothiocyanatothioisocyanate, isocyanato component, polythiol and optionally one or more known polyols are known. A polymerizable component in combination with the active hydrogen compound component can be suitably used. Here, polyisocyanates include aliphatic, alicyclic, aromatic, and derivatives thereof, and sulfide, polysulfide, and thiocarbonyl (thioketone) derivatives in which sulfur is introduced into part of their carbon chains. The compound can be mentioned. Of these, aliphatic or alicyclic polyisocyanates are desirable from the viewpoint of UV resistance. Similarly, polythiols include aliphatic, alicyclic, aromatic, and derivatives thereof, as well as sulfide, polysulfide, and thiocarbonyl (thioketone) derivatives in which sulfur is introduced into a part of their carbon chains. The compound can be mentioned. Of these, aliphatic or alicyclic polyisocyanates are desirable from the viewpoint of UV resistance.

The episulfide-based resin means a polymer (resin) obtained by reacting a dithioepoxy compound, a curing agent, and another polysynthetic compound. A known product obtained by curing a linear alkyl sulfide type dithioepoxy compound can be used. As the curing agent, amines, organic acids, or inorganic acids that are ordinary epoxy resin curing agents can be used.

Specific examples of the organic glass substrate 11 include MR-6, MR-8, MR-20, MR-60, MR-95 (Mitsui Chemicals, thiourethane resin, refractive index: 1.60), MR -7, MR-10 (Mitsui Chemicals Co., Ltd. thiourethane resin, refractive index: 1.67), MR-174 (Mitsui Chemicals, Inc. episulfide resin, refractive index: 1.74), NK-11P, LS106S, LS420 (Nippon Shimizu Sangyo Co., Ltd. (meth) acrylate resin, refractive index: 1.56), Iupilon CLS3400 (Mitsubishi Engineering Plastics polycarbonate resin, refractive index: 1.59), Grillamide TR XE3805 (Nylon (polyamide) based resin, refractive index: 1.53) manufactured by EMS Chemie Japan, NXT (Tribex) (ICRX NXT Co.) made by polyurea resin, refractive index: 1.53) can be suitably used and the like.

The organic glass substrate 11 includes an organic anti-degradation agent that prevents resin deterioration of the organic glass, an internal mold release agent that improves mold release from the mold for molding the lens shape, and a curing agent that cures the organic glass. A suitable material can be added according to the kind of glass.

The deterioration preventing agent is an alkyl radical (R ·: R is generated when the organic glass resin is decomposed or deteriorated by light or heat while absorbing light of 280 to 320 nm, which is easily decomposed or deteriorated by the organic glass resin. By capturing or decomposing alkyl chains), peroxy radicals (ROO.), And peroxides (ROOH), the deterioration of the resin is prevented from proceeding at an accelerated rate. Since the degradation inhibitor has an absorption peak wavelength on the short wavelength side, the organic glass substrate 11 does not yellow when it is contained in the organic glass substrate 11. Examples of the deterioration inhibitor include benzophenone, diphenyl acrylate, sterically hindered amine, salicylic acid ester, benzotriazole, hydroxybenzoate, cyanoacrylate, hydroxyphenyl triazine, and the like. A suitable deterioration inhibitor can be added depending on the type of organic glass.

The internal mold release agent is an additive that is added to improve the release from the mold during mold removal after the organic glass substrate 11 is molded from the organic glass using the mold. A general-purpose product can be used as the mold agent.

The curing agent is an additive that cures (polymerizes) the organic glass that forms the organic glass substrate 11, and a material suitable for curing organic glass, such as a peroxide-based polymerization initiator, can be used. .

The organic glass substrate 11 can be formed using a general forming method such as a polishing method or a casting method. The polishing method is a method in which a synthetic resin for forming an organic glass base material is molded into a block-shaped resin under suitable conditions, and then polished according to a lens design that requires the block-shaped resin. In the casting molding method, taking an uneven lens as an example, a cavity is formed by sealing the peripheral surface of the mold with taping or a gasket at an interval that requires a concave mold and a convex mold. In this method, a synthetic resin for molding the organic glass substrate 11 is injected and cured, and the organic glass substrate 11 is polished as necessary.

The functional resin layer 15 is a layer that is integrated on one side of the organic glass substrate 11, and is a layer that is thinner than the organic glass substrate 11. The functional resin layer 15 contains an ultraviolet absorber having an absorption peak wavelength of 320 nm or more, and may contain a specific wavelength absorber having an absorption peak wavelength in a wavelength range of 400 to 500 nm, if necessary.

As the resin for forming the functional resin layer 15, a synthetic resin such as a thiourethane resin, an episulfide resin, or a (meth) acrylate resin can be used. These are resin materials excellent in adhesion to thiourethane, episulfide, (meth) acrylate, polycarbonate, polyamide (nylon) and polyurea resin materials. Among these, a thiourethane resin excellent in adhesion to the organic glass substrate 11 can be used more preferably. More specifically, the resin for forming the functional resin layer 15 is MR-6, MR-8, MR-20, MR-60, MR-95 (Mitsui Chemicals thiourethane resin, refractive index: 1). .60), MR-7, MR-10 (Mitsui Chemicals Co., Ltd. thiourethane resin, refractive index: 1.67) and the like can be suitably used. Although the adhesion is slightly inferior, MR-174 (Mitsui Chemicals episulfide resin, refractive index: 1.74), NK-11P (Nippon Shimizu Sangyo Co., Ltd. (meth) acrylate resin, refractive index: 1.56), etc. can also be used. The resin that forms the functional resin layer 15 includes a deterioration preventing agent that prevents resin deterioration of the organic glass, an internal release agent that improves releasability from the mold for forming the lens shape, and a curing that cures the organic glass. An agent suitable for the type of resin can be added.

The ultraviolet absorber having an absorption peak wavelength of 320 nm or more is an ultraviolet absorber having an absorption peak wavelength on the long wavelength side, and has a high blue light cut rate. The upper limit of the absorption peak wavelength of the ultraviolet absorber is 500 nm, which is the upper limit of the wavelength of blue light. By adding an ultraviolet absorber having an absorption peak wavelength of 320 nm or more to the spectacle material, the spectacle material can cut blue light. However, UV absorbers with a high blue light cut rate have an absorption peak wavelength on the long wavelength side, so when they are contained in a spectacle material (base lens), the spectacle material is yellowed (colored yellow or discolored). )). Yellowed eyeglass materials are not preferred as eyeglass materials because they are reminded of UV-degraded resin. In many cases, the eyeglass material is a lens with a degree, and the difference in thickness between the inner and outer circumferences causes a difference in color tone, which may cause a problem in appearance. For this reason, in the eyeglass material of the embodiment, the eyeglass material is yellow by adding an ultraviolet absorber having an absorption peak wavelength of 320 nm or more to the functional resin layer 15 having a thickness smaller than that of the base lens (organic glass base material 11). The yellowness (YI) as the eyeglass material is less than 10. The yellowness (YI) indicates that the larger the value, the stronger the yellowness. The yellowness (YI) as a spectacle material is more preferably less than 8.

Examples of ultraviolet absorbers having an absorption peak wavelength of 320 nm or more include benzophenone series, diphenyl acrylate series, sterically hindered amine series, salicylic acid ester series, benzotriazole series, hydroxybenzoate series, cyanoacrylate series, and hydroxyphenyl triazine series. Can do. Among these, a benzotriazole-based resin deterioration preventing agent having an absorption peak wavelength of 320 nm or more is preferable, and a benzotriazole-based resin deterioration preventing agent having an absorption peak wavelength of 340 nm or more (particularly preferably 350 nm or more) is more preferable. . SEESORB701 (342 nm (absorption peak wavelength)), SEESORB709 (343 nm), SEESORB706 (344 nm), SEESORB704 (345 nm), SEESORB707 (manufactured by Sipro Kasei Co., Ltd.) 346 nm), SEESORB 702 (351 nm), SEESORB 702L (352 nm), SEESORB 703 (354 nm), and the like can be preferably used. The absorption peak wavelength may have an error of about ± 5 nm depending on the conditions of the measuring apparatus and the organic glass molding method.

The content of the ultraviolet absorber having an absorption peak wavelength of 320 nm or more with respect to the functional resin layer 15 is preferably 0.1 to 3.0% by mass. This is because ultraviolet rays can be cut and yellowing of the eyeglass material can be suppressed. When the content of the ultraviolet absorber is less than 0.1% by mass, the ultraviolet rays may not be sufficiently cut. On the other hand, if it exceeds 3.0% by mass, the spectacle material may be yellowed. More preferably, it is 0.2 to 2.5% by mass, and still more preferably 0.5 to 1.5% by mass.

The specific wavelength absorber is a dye (absorbent) having an absorption peak wavelength at a specific wavelength. The specific wavelength absorber is selected depending on the wavelength of the absorption peak wavelength. For example, squarylium, azomethine, cyanine, xanthene, tetraazaporphyrin, pyromethene, isoindolinone, quinacridone, diacyl. Ketopyrrolopyrrole, anthraquinone, dioxazine, and the like can be used. These can use what is generally marketed according to the wavelength of an absorption peak wavelength, and use the specific wavelength absorber marketed by Tokyo Chemical Industry Co., Ltd., Yamamoto Kasei Co., Ltd., Yamada Chemical Co., Ltd., etc. be able to.

The eyeglass material of the embodiment can further cut blue light by containing a specific wavelength absorber having an absorption peak wavelength in a wavelength range of 400 to 500 nm. As specific wavelength absorbers having an absorption peak wavelength in the wavelength range of 400 to 500 nm, FDB-001 (420 nm), FDB-002 (431 nm), FDB-003 (437 nm), FDB-004 (445 nm) manufactured by Yamada Chemical Co., Ltd. ), FDB-005 (452 nm), FDB-006 (473 nm), FDB-007 (496 nm), and the like can be used.

Further, the eyeglass material of the embodiment includes a specific wavelength absorber having an absorption peak wavelength in the wavelength range of 565 to 605 nm, thereby having a function of selectively cutting dazzling light and improving the appearance. It will be a thing. As a specific wavelength absorber having an absorption peak wavelength in the wavelength range of 565 to 605 nm, NeoContrast (manufactured by Mitsui Chemicals, Inc., absorption peak wavelength: 580 nm) can be used. Details of NeoContrast are described in Japanese Patent No. 5778109 and US Pat. No. 7,506,777. The absorption peak wavelength may have an error of about ± 5 nm depending on the conditions of the measuring apparatus and the organic glass molding method.

The content of the specific wavelength absorber with respect to the functional resin layer 15 is preferably 0.05 to 1.0% by mass. This is because it is possible to cut light of a specific wavelength including blue light and it is easy to dissolve in a functional resin. When content of a specific wavelength absorber is less than 0.05 mass%, there exists a possibility that the specific wavelength light containing blue light cannot fully be cut. On the other hand, when it exceeds 1.0 mass%, there exists a possibility that the melt | dissolution to a functional resin may become difficult. More preferably, the content is 0.1 to 0.5% by mass.

The integration of the functional resin layer 15 into the organic glass substrate 11 was performed by a casting method, but can also be performed by a general method such as a dipping method or a spray method. The casting molding method is a method in which a mold cavity 21 is formed in the organic glass substrate 11 and molding is performed by injecting a functional resin.

The cavity 21 uses the organic glass base material as the first mold 11, and arranges the second mold 17 so that a certain gap is formed outside the first mold 11, while the first mold 11 and the second mold 17 The circumferential clearance is formed by sealing with a taping 19 or the like.

The gap between the cavities 21 is set according to the flow characteristics of the functional resin and the functionality required for the functional resin layer 15, but is preferably 0.2 to 3.0 mm. Since the gap between the cavities 21 is secured to such an extent that injection is easy, casting can be performed instantaneously, and the injected functional resin can be cured without flowing. This is because it is possible to suppress the occurrence of reason (parts having different refractive indexes). If it is less than 0.2 mm, injection may be difficult even for a resin having excellent fluidity. On the other hand, if it exceeds 3.0 mm, striae may occur due to uneven curing due to the flow of the functional resin. More preferably, it is 0.3 to 1.5 mm, and still more preferably 0.4 to 1.0 mm.

In addition, the functional resin layer 15 can have a certain thickness by using the same mold as that used for forming the organic glass substrate 11 for the second mold 17.

Hereinafter, the present invention will be described in more detail with reference to examples. The composition of the organic glass substrate 11 is described in Table 1, and the composition of the functional resin layer 15 is described in Table 2.

Commercially available products were used for the resin materials used for the organic glass substrate 11 and the functional resin layer 15, and in Tables 1 and 2, abbreviations were used for the description of the types of resin materials. The types and refractive indexes of resin materials for the abbreviations are described below. “MR-10” (Mitsui Chemicals, thiourethane resin, refractive index: 1.67), “MR-20” (Mitsui Chemicals, thiourethane resin, refractive index: 1.60), “MR -95 "(Mitsui Chemicals, Inc., thiourethane resin, refractive index: 1.60)," MR-174 "(Mitsui Chemicals, Inc., episulfide resin, refractive index: 1.74)," NK-11P " (Nippon Shimizu Sangyo Co., Ltd. (meth) acrylate resin, refractive index: 1.56), “CLS3400” (Mitsubishi Engineering Plastics polycarbonate resin, refractive index: 1.59), “XE3805” (Ms Chemie・ Japan Corporation nylon resin, refractive index: 1.53), “NXT” (Trix Corporation (ICRX NXT)) polyurea resin, refractive index: 1.5 ) Note that the resin material is suitable for each, antidegradant were added the internal mold release agent and curing agent.

Commercially available products are used as the UV absorber used for the functional resin layer 15, and the absorption peak wavelengths of the UV absorbers used in Tables 1 and 2 are described below. SEESORB 701 (Cipro Kasei Co., Ltd., absorption peak wavelength: 342 nm), SEESORB 704 (Cipro Kasei Co., Ltd., absorption peak wavelength: 345 nm), SEESORB 702 (Cipro Kasei Co., Ltd., absorption peak wavelength: 351 nm), SEESORB 703 (Cipro Kasei Co., Ltd.) (Manufactured by company, absorption peak wavelength: 354 nm).

Commercially available products are used as the specific wavelength absorbers used for the functional resin layer 15, and the absorption peak wavelengths of the specific wavelength absorbers used in Table 2 are described below. FDB-001 (Yamada Chemical Industries, Ltd., absorption peak wavelength: 420 nm), FDB-002 (Yamada Chemical Industries, Ltd., absorption peak wavelength: 431 nm), FDB-003 (Yamada Chemical Industries, Ltd., absorption peak wavelength) : 437 nm), NeoContrast (Mitsui Chemicals, absorption peak wavelength: 580 nm).

The organic glass substrate 11 is molded by a cast molding method, and the mold is taped with an adhesive tape so that the distance between the center of the lens is 1.0 mm between the convex mold and the concave mold. A mold having a cavity for forming an organic glass substrate was prepared.

The organic glass substrate 11 is mixed with the composition shown in Table 1 and injected into a mold, and the thiourethane and episulfide systems are heated and cured at 120 ° C. for 2 hours, and the (meth) acrylate system is heated and cured at 80 ° C. for 1 hour. Molded. As the polycarbonate resin, polyamide resin, and polyurea resin, cast molded products were used.

The casting molding of the functional resin layer 15 onto the organic glass substrate 11 is performed by forming a mold cavity 21 in the organic glass substrate 11 and injecting and curing the functional resin for molding the functional resin layer 15. Was molded by. The cavity 21 uses the organic glass substrate as the first mold 11 and the convex mold used as the second mold 17 when forming the organic glass substrate 11 so that a certain gap is formed outside the first mold 11. And the peripheral surface gap between the first mold 11 and the second mold 17 is sealed with a taping 19.

The organic glass substrate 11 (resin lens) on which the functional resin layer 15 is molded has a concave surface and an outer periphery cut and polished, and an SPH (spherical surface (D)) having a diameter of 70 mm is −8.00. Spectacle lens).

The eyeglass material of the test example is created by a combination of the organic glass substrate 11 and the functional resin layer 15 described below, and for these, as an optical property evaluation performance, an ultraviolet cut rate, a 420 nm cut rate, and a visible light transmittance are set. The yellowness (YI) was measured as an evaluation of appearance, and the adhesion was measured as an evaluation of strength.
<Ultraviolet cut rate, 420 nm cut rate, visible light transmittance>
Spectral transmittance curve (transmittance of light for each wavelength of spectacle material) is calculated according to the following equipment and standards, UV cut rate is average cut rate (light not transmitted) for light of 280-400 nm, 420 nm cut The rate was the cut rate for light of 420 nm, and the visible light transmittance was the average transmittance for light of 380 to 780 nm. The measurement position was the geometric center of the spectacle material because it was a measurement of optical characteristics.

・ Device: Spectrophotometer U-4100 (manufactured by Hitachi High-Tech Science Co., Ltd.)
Standard: Specification and test method of transmittance of refraction correcting spectacle lens (JIS T 7333: 2005 (ISO / DIS 8980-3: 2002))
And the ultraviolet cut rate was evaluated as follows. A: 95% or more, O: 90% or more and less than 95%, Δ: 70% or more and less than 90%, ×: less than 70%. Since ultraviolet rays may cause cataracts and macular degeneration when in the eyes, the higher the numerical value, the better the ultraviolet cut rate.

The 420 nm cut rate was evaluated as follows. A: 40% or more, B: 30% or more and less than 40%, Δ: 20% or more and less than 30%, X: less than 20%. If the eyes are exposed to blue light (420 nm) for a long time, the eyes and biological rhythm may be affected. Therefore, the higher the numerical value of the 420 nm cut rate, the better the evaluation.

The visible light transmittance was evaluated as follows. A: 85% or more, O: 80% or more and less than 85%, Δ: 70% or more and less than 80%, x: less than 70%. If the visible light transmittance is low, the field of view becomes dark. Therefore, the higher the numerical value, the better the visible light transmittance.
<Yellowness (YI)>
The color tristimulus values (XYZ) were measured with the following apparatus, and the yellowness (YI) was calculated from the following standards. The measurement positions were the geometric center (center) of the thinnest eyeglass material and the inner side (outer periphery) 5 mm from the thickest outer periphery.

・ Device: Spectrophotometer U-4100 (manufactured by Hitachi High-Tech Science Co., Ltd.)
・ Standard: Plastic-Determination of yellowness and yellowing (JIS K 7373: 2006)
And yellowness (YI) was evaluated as follows. A: Less than 6, O: 6 or more and less than 8, Δ: 8 or more and less than 10, x: 10 or more. When yellowness (YI) is high, yellowness increases. Therefore, yellowness (YI) is better evaluated when its numerical value is low.
<Adhesion>
The adhesion was evaluated by applying a shock to the functional resin layer 15 side of the eyeglass material and peeling the functional resin layer 15. The impact was given by placing the eyeglass material on the floor and dropping an iron ball having a height of 1 m to 500 g.

And the adhesiveness was evaluated as follows. ◎: No abnormality, ○: Scratches are observed in the functional resin layer 15, Δ: Defects are found in the functional resin layer 15 and the area is less than 5%, X: Defects in the functional resin layer 15 are observed The area is 5% or more of the whole.

The test example is described below. Test examples 1 to 4, 13 to 45 are examples, and test examples 5 to 12 are comparative examples.

(Test Examples 1 to 4)
Test Examples 1 to 4 are examples in which the best mode is set. Table 3 shows the combination of the organic glass substrate and the functional resin layer, and the evaluation performance results.

In Test Examples 1 to 4, a functional resin layer containing an ultraviolet absorber having an absorption peak wavelength of 351 nm and a specific wavelength absorber having an absorption peak wavelength of 420 nm was molded on various organic glass substrates. It is. The UV ray is sufficiently cut by the UV absorber, and the blue light (420 nm) is also sufficiently cut by the UV absorber and the specific wavelength absorber, but the visible light visibility (visible light transmittance) is ensured. It had been. Moreover, since the functional resin layer containing the ultraviolet absorber was thin, yellowing (yellowness) could be suppressed in both the thin center portion and the thick outer periphery of the spectacle material. Also, the adhesion was good.

(Test Examples 5 to 8)
Test Examples 5 to 8 are comparative examples in which the functional resin layer was not provided. The evaluation performance results for the organic glass substrate are shown in Table 4.

Test Examples 5 to 8 were not provided with a functional resin layer containing an ultraviolet absorber as compared with Test Examples 1 to 4, and therefore UV rays and blue light could not be sufficiently cut. In addition, since the functional resin layer was not provided, adhesiveness was not evaluated.

(Test Examples 9 to 12)
Test Examples 9 to 12 are comparative examples in which a functional resin layer was not provided and an ultraviolet absorber was added to the organic glass substrate. The results of evaluation performance for the organic glass substrate are shown in Table 5.

In Test Examples 9 to 12, compared with Test Examples 1 to 4, the ultraviolet absorber was added to the organic glass substrate, so that the ultraviolet rays could be cut. However, the ultraviolet absorber was added to the thick organic glass substrate. As a result, the base lens was yellowed over the outer periphery. In addition, since the functional resin layer was not provided, adhesiveness was not evaluated.

(Test Examples 13 to 28)
Test Examples 13 to 28 are test examples in which various functional resin layers and various organic glass substrates are combined. Compared with Test Examples 1 to 4, a specific wavelength absorber is added to the functional resin layer. Not different in that. Table 6 shows the combination of the organic glass substrate and the functional resin layer, and the evaluation performance results.

In Test Examples 13 to 28, a specific wavelength absorber is not added to the functional resin layer as compared with Test Examples 1 to 4, but an ultraviolet absorber having an absorption peak wavelength on the long wavelength side is added. As a result, blue light could be cut to some extent. In addition, the test example which used the episulfide type resin and the (meth) acrylate type resin for the functional resin layer was slightly inferior in adhesion.

(Test Examples 29 to 31)
Test Examples 29 to 31 are test examples in which the type of the specific wavelength absorber is changed. Compared to Test Example 3, the absorption peak wavelength of the specific wavelength absorber is different. Table 7 shows the combination of the organic glass substrate and the functional resin layer, and the evaluation performance results.

Test Examples 29 to 31 were able to sufficiently cut blue light, although the absorption peak wavelength of the specific wavelength absorber was different from that of Test Example 3.

(Test Examples 32-36)
Test Examples 32-36 are test examples in which the addition amount of the ultraviolet absorber was changed. Compared to Test Example 3, the specific wavelength absorber is not added and the amount of the ultraviolet absorber added is different. Table 8 shows the combination of the organic glass substrate and the functional resin layer, and the results of the evaluation performance.

Compared with Test Example 3, Test Example 32 with a small amount of added UV absorber is inferior in UV and blue light cutting performance, and Test Example 36 with a large amount of UV absorber added has a functional resin layer on the outer periphery. Slightly yellowish over time.

(Test Examples 37 to 41)
Test Examples 37 to 41 are test examples in which the thickness of the functional resin layer was changed. Compared to Test Example 3, the thickness of the functional resin layer is different. Table 9 shows the combination of the organic glass substrate and the functional resin layer, and the evaluation performance results.

Compared with Test Example 3, in Test Example 37 where the thickness of the functional resin layer is small, the UV and blue light cutting performance is inferior, and although not shown in the table, cast molding can be performed instantaneously. The workability was somewhat inferior. In Test Example 41 where the thickness of the functional resin layer is large, a slight yellowing was seen on the outer periphery of the functional resin layer, which was not shown in the table, but there was slight striae due to uneven curing due to the thickness. Occurred.

(Test Examples 42 to 45)
Test Examples 42 to 45 use functional resin layers X in which FDB-001 having an absorption peak wavelength of 420 nm and NeoContrast having an absorption peak wavelength of 580 nm are contained in a specific wavelength absorber. Table 10 shows the combination of the organic glass substrate and the functional resin layer, and the results of the evaluation performance.

In Test Examples 42 to 45, the ultraviolet rays were sufficiently cut by the ultraviolet absorber, and the blue light (420 nm) was also sufficiently cut by the ultraviolet absorber and the specific wavelength absorber FDB-001, but visible. The light visibility (visible light transmittance) was secured. These contained NeoContrast, a specific wavelength absorber, and the appearance of the eyeglass material was improved. Moreover, since the functional resin layer containing the ultraviolet absorber was thin, yellowness (yellowness) could be suppressed in both the thin center portion and the thick outer periphery of the spectacle material. Furthermore, even when the organic glass substrate was a polycarbonate resin (CLS3400), a polyamide resin (XE3805), or a polyurea resin (NXT), the adhesion was good.

DESCRIPTION OF SYMBOLS 11 ... Organic glass base material (1st mold), 15 ... Functional resin layer, 17 ... 2nd mold, 19 ... Taping, 21 ... Cavity.

Claims

In a spectacle material in which a functional resin layer is integrated on one side or both sides of an organic glass substrate that is a resin molded body,
The functional resin layer contains an ultraviolet absorber having an absorption peak wavelength of 320 nm or more,
The eyeglass material has a yellowness index (YI) of less than 10.
The ultraviolet absorber having an absorption peak wavelength of 320 nm or more is a benzotriazole ultraviolet absorber, and the content of the ultraviolet absorber in the functional resin layer is 0.1 to 3.0% by mass. The eyeglass material according to claim 1, wherein
2. The eyeglass material according to claim 1, wherein the functional resin layer contains a specific wavelength absorber having an absorption peak wavelength in a wavelength range of 400 to 500 nm.
4. The eyeglass material according to claim 3, wherein a cut rate of light having a wavelength of 420 nm is 20% or more.
The organic glass substrate is molded from a thiourethane-based, episulfide-based or (meth) acrylate-based thermosetting resin raw material,
2. The eyeglass material according to claim 1, wherein the functional resin layer is formed of a thiourethane-based, episulfide-based, or (meth) acrylate-based thermosetting resin material.
2. The eyeglass material according to claim 1, wherein the functional resin layer has a thickness of 0.2 to 3.0 mm.