JPWO2018008179A1 - Glasses material - Google Patents

Abstract

An eyeglass material capable of suppressing the yellowing of the eyeglass material and suppressing the color tone difference caused by the difference in thickness of the inner and outer periphery of the eyeglass material, even if the eyeglass material contains an ultraviolet light absorber having a high blue light cut ratio To provide.
The eyeglass material is an eyeglass material in which the functional resin layer 15 is integrated on one side or both sides of the organic glass substrate 11 which is a resin molded body, and the functional resin layer 15 has an absorption peak wavelength of 320 nm or more It contains a UV absorber and has a smaller thickness than the organic glass substrate 11. Thereby, the eyeglass material can have a yellowness (YI) of less than 10.

Description

  The present invention relates to an eyeglass material containing a UV absorber.

  Ultraviolet light can cause cataract and macular degeneration if it enters the eye. For this reason, what a spectacles material can reduce permeation | transmission of the ultraviolet-ray which enters into eyes is preferable.

  Conventional eyeglass materials are designed to be capable of reducing the transmission of ultraviolet light by blending an ultraviolet light absorber into an organic glass substrate (substrate lens).

  In the eyeglass materials described in Patent Documents 1 and 2, it is possible to reduce the transmission of ultraviolet light by blending an ultraviolet light absorber having a specific chemical structure or the like.

  In the method for producing a resin lens 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 the molding side of the base resin lens. The adhesive layer of the above is provided to integrate the base lens and the functional resin layer. In the resin lens manufactured by this manufacturing method, when the functional resin layer contains a specific wavelength absorber or the like, transmission of a specific wavelength or the like can be reduced.

Patent No. 3868683 Patent No. 4149068 gazette JP, 2014-156067, A

  In recent years, among visible light, light with a wavelength of 400 to 500 nm (blue light) is a light of strong energy reaching the retina of the eyeball, and affects the eye and biological rhythm when the eye is exposed to blue light for a long time It has been known.

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

  However, since the absorption peak wavelength of the ultraviolet light absorber having a high blue light cut rate is on the long wavelength side, when it is contained in the eyeglass material, it causes a problem that the eyeglass material yellows (colors yellow or discolors). was there. The yellowed eyeglass material is not preferable as an eyeglass material because it is reminiscent of UV-degraded resin. Further, the eyeglass material is often a lens with a degree, and a difference in thickness between the inner and outer peripheries causes a difference in gradation in color tone, which may cause an appearance problem.

  In the eyeglass materials described in Patent Documents 1 and 2, although it is possible to reduce the transmission of ultraviolet light by blending an ultraviolet light absorber having a conventional specific chemical structure, the absorption peak wavelength of the ultraviolet light absorber is long. Since it is not on the wavelength side, the problem of yellowing the eyeglass material hardly occurs. However, when the ultraviolet absorber having an absorption peak wavelength with a high blue light cut rate on the long wavelength side is blended with the spectacles materials described in Patent Documents 1 and 2, there arises a problem that the spectacles material becomes yellowish. Furthermore, since the eyeglass material is molded into a lens (semi-finished product) and then cut and polished according to the prescription power of the customer, the eyeglass materials described in Patent Documents 1 and 2 have a considerable portion of the lens at the time of cutting. It would be wasteful, and at the same time, the expensive UV absorber added at the same time was also wasted, which was uneconomical.

  Moreover, when an adhesive bond layer intervenes between a substrate lens and a functional resin layer like patent document 3, it is necessary to apply an adhesive on an organic glass substrate, and the manufacturing man-hour is bulky. It is easy to see. Further, depending on the material and thickness of the adhesive layer, there is a possibility that refractive error or color unevenness may occur. Furthermore, it has not been actively studied to blend an ultraviolet absorber having an absorption peak wavelength with a high blue light cut rate on the long wavelength side in the functional resin layer.

  The present invention has been made in view of the above-mentioned point, and even if the spectacles material contains an ultraviolet light absorber having a high blue light cut rate, the yellowing of the spectacles material is suppressed and the thickness of the inner and outer circumference of the spectacles material is reduced. An object of the present invention is to provide an eyeglass material capable of suppressing the tone difference of color tone resulting from the 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 which is a resin molded body, and the functional resin layer has an absorption peak wavelength of 320 nm or more An ultraviolet absorber is contained, and the spectacle material is characterized by having a yellowness (YI) of less than 10.

  According to the spectacles material of the present invention, since the ultraviolet absorber has an absorption peak wavelength of 320 nm or more, the spectacles material of the present invention can cut blue light (400 to 500 nm). In addition, the eyeglass material of the present invention can have a yellowness (YI) of less than 10 because the ultraviolet resin is contained in the functional resin layer which is thinner than the organic glass substrate. Compared to the case where the ultraviolet absorber is contained in the entire organic glass substrate, it is possible to suppress the yellowing of the eyeglass material and to suppress the difference in color tone between the inner and outer peripheral thickness of the eyeglass material.

  Here, the UV absorber having an absorption peak wavelength of 320 nm or more is a benzotriazole-based UV absorber, and the content of the UV absorber in the functional resin layer is 0.1 to 3.0% by mass. It can be said that According to this, it is possible to reduce the average transmittance of light in the ultraviolet range (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 the wavelength range of 400 to 500 nm. According to this, since the specific wavelength absorber can cut blue light, the spectacles material can cut blue light more.

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

  In addition, the organic glass substrate is formed of a thiourethane-based, episulfide-based or (meth) acrylate-based thermosetting resin raw material, and the functional resin layer is a thiourethane-based, episulfide-based or (meth) acrylate-based. It can be molded with the 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 adhesion to the thiourethane-based, episulfide-based or (meth) acrylate-based thermosetting resin raw material Being a raw material, the functional resin layer can be in close contact with the organic glass substrate without requiring a primer, an adhesive or the like.

  Moreover, the thickness of the said functional resin layer shall be 0.2-3.0 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 curing is performed without generation of curing unevenness in the injected functional resin layer. Therefore, the spectacles material can suppress the occurrence of striae (the occurrence of portions with different refractive indices).

  According to the spectacles material of the present invention, since the ultraviolet absorber has an absorption peak wavelength of 320 nm or more, the spectacles material of the present invention can cut blue light (400 to 500 nm). In addition, the eyeglass material of the present invention can have a yellowness (YI) of less than 10 because the ultraviolet resin is contained in the functional resin layer which is thinner than the organic glass substrate. Compared to the case where the ultraviolet absorber is contained in the entire organic glass substrate, it is possible to suppress the yellowing of the eyeglass material and to suppress the difference in color tone between the inner and outer peripheral thickness of the eyeglass material.

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. The eyeglass material according to the embodiment is an eyeglass material in which the functional resin layer 15 is integrated on one side or both sides of the organic glass substrate 11 (base lens) which is a resin molded body. The glasses material is characterized by containing an ultraviolet light 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 eyeglass material of the embodiment, as shown in FIG. 1, an example in which the functional resin layer 15 is integrated by casting on the surface (convex surface) of the organic glass substrate 11 as an eyeglass lens will be described as an example. . Of course, the 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 applications. In addition, the functional resin layer 15 of the present invention is not limited to the application to the surface (convex surface) of the organic glass substrate 11, and the back surface (concave surface) or both surfaces (convex surface and concave surface) of the organic glass substrate 11 Is also applicable to

  The organic glass substrate 11 is used as a substrate of an optical element such as a lens or window glass, and the eyeglass material of the embodiment is made of organic glass (plastic) because it is lighter than inorganic glass. It shall be.

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

  The thiourethane resin is a polymer (resin) having a bond (-NHCOS-, -NHCSO-, -NHCSS-) in which at least one of the oxygen atoms of the polyurethane bond (-NHCOO-) is replaced with a sulfur atom. means. As the resin material, one or two or more selected from polyisocyanato, polyisothiocyanato, and polyisothiocyanatothioisocyanate, and an isocyanato component, and one or more known compounds selected from polythiol and an appropriate polyol The polymerizable component which combined the active hydrogen compound component of these can be used conveniently. Here, as the polyisocyanate, aliphatic, alicyclic, aromatic and derivatives thereof and a sulfide-polysulfide-thiocarbonyl (thioketone) derivative in which sulfur is introduced to a part of their carbon chain Mention may be made of the compounds. Among these, aliphatic or alicyclic polyisocyanates are preferable from the viewpoint of UV resistance degradation. Also, as polythiols, similarly, aliphatic, alicyclic, aromatic and derivatives thereof and sulfide / polysulfide / thiocarbonyl (thioketone) derivatives in which sulfur is introduced to a part of their carbon chains Mention may be made of the compounds. Among these, aliphatic or alicyclic polyisocyanates are preferable from the viewpoint of UV resistance degradation.

  The episulfide resin means a polymer (resin) obtained by reacting the dithioepoxy compound, the curing agent, and the other heavy synthetic compounds. Known compounds obtained by curing a linear alkyl sulfide type dithioepoxy compound can be used. As a curing agent, amines, organic acids, or inorganic acids that are common curing agents for epoxy resins can be used.

  Specific examples of the organic glass substrate 11 include MR-6, MR-8, MR-20, MR-60, and MR-95 (thiourethane resin manufactured by Mitsui Chemicals, Inc., refractive index: 1.60), MR -7, MR-10 (thiourethane resin manufactured by Mitsui Chemicals, Inc., refractive index: 1.67), MR-174 (episulfide resin manufactured by Mitsui Chemicals, Inc., refractive index: 1.74), NK-11P, LS106S, LS420 (Japan Shimizu Sangyo Co., Ltd. (meth) acrylate resin, refractive index: 1.56), Eupilon CLS 3400 (Mitsubishi Engineering Plastics Co., Ltd. polycarbonate resin, refractive index: 1.59), Grilamide TR XE3805 (Ms. Skeme Japan Inc. nylon (polyamide) based resin, refractive index: 1.53), NXT (Tribex Corporation) 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 anti-degradation agent for preventing resin deterioration of the organic glass, an internal release agent for improving releasability from the mold for forming the lens shape, and a curing agent for curing the organic glass. Depending on the type of glass, suitable ones can be added.

  The anti-deterioration agent is an alkyl radical (R: R is generated when the resin of organic glass is decomposed or deteriorated by light or heat while absorbing the light of 280 to 320 nm where the resin of organic glass is easily decomposed or deteriorated. By trapping or decomposing alkyl chains), peroxy radicals (ROO.) And peroxides (ROOH), it is possible to suppress the accelerated deterioration of the resin. Since the deterioration preventing agent has the 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 type, diphenyl acrylate type, sterically hindered amine type, salicylic acid ester type, benzotriazole type, hydroxybenzoate type, cyanoacrylate type, hydroxyphenyl triazine type and the like. An anti-deterioration agent can be added according to the kind of organic glass.

  The internal mold release agent is an additive added to improve removal from the mold during demolding after molding the organic glass substrate 11 from organic glass using the mold, and internal release General-purpose products can be used as a template.

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

  For forming the organic glass substrate 11, a general forming method such as a polishing method or a cast molding method can be used. The polishing method is a method of forming a synthetic resin for forming an organic glass substrate into a block-like resin under suitable conditions, and then polishing according to a lens design for obtaining the block-like resin. In the cast molding method, taking the concave and convex lens as an example, the peripheral surface of the mold is sealed using taping or a gasket to form a cavity at a distance requiring the concave mold and the 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 if necessary.

  The functional resin layer 15 is a layer integrated on one side of the organic glass substrate 11, and is a layer 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 can optionally contain a specific wavelength absorber having an absorption peak wavelength in the wavelength range of 400 to 500 nm.

  As a resin for molding the functional resin layer 15, synthetic resins such as thiourethane resins, episulfide resins, (meth) acrylate resins and the like can be used. These are resin raw materials which are excellent in adhesion to the thiourethane-based, episulfide-based, (meth) acrylate-based, polycarbonate-based, polyamide-based (nylon-based) and polyurea-based resin raw materials. Among these, a thiourethane resin excellent in adhesion to the organic glass substrate 11 can be more preferably used. More specific resins for molding the functional resin layer 15 include MR-6, MR-8, MR-20, MR-60, and MR-95 (thiourethane resin manufactured by Mitsui Chemicals, Inc., refractive index: 1 .60), MR-7 and MR-10 (thiourethane resin manufactured by Mitsui Chemicals, Inc., refractive index: 1.67), etc. can be suitably used. Although the adhesion is somewhat inferior, MR-174 (episulfide resin manufactured by Mitsui Chemicals, Inc., refractive index: 1.74), NK-11P ((meth) acrylate resin manufactured by Japan Shimizu Sangyo Co., Ltd., refractive index: 1.56), etc. can also be used. The resin for molding the functional resin layer 15 includes a deterioration inhibitor for preventing resin deterioration of the organic glass, an internal release agent for improving releasability from the mold for molding the lens shape, and a curing for curing the organic glass An agent can be added according to the kind of resin.

  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 ratio. 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 eyeglass material, the eyeglass material can be capable of cutting blue light. However, since the absorption peak wavelength of the ultraviolet light absorber having a high blue light cut rate is on the long wavelength side, the eyeglass material becomes yellowed (yellowed or discolored when it is contained in the eyeglass material (base lens) There is a problem of doing.). The yellowed eyeglass material is not preferable as an eyeglass material because it is reminiscent of UV-degraded resin. Further, the eyeglass material is often a lens with a degree, and a difference in thickness between the inner and outer peripheries causes a difference in gradation in color tone, which may cause an appearance problem. 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 thinner than the substrate lens (organic glass substrate 11). To prevent the yellowing (YI) of the eyeglass material is less than 10. The degree of yellowness (YI) indicates that the greater the numerical value, the stronger the yellowness, and the degree of yellowness (YI) as the eyeglass material is more preferably less than 8.

  Examples of UV absorbers having an absorption peak wavelength of 320 nm or more include benzophenones, diphenyl acrylates, sterically hindered amines, salicylic esters, benzotriazoles, hydroxybenzoates, cyanoacrylates, hydroxyphenyl triazines, etc. Can. Among these, benzotriazole resin deterioration inhibitors having an absorption peak wavelength of 320 nm or more are preferable, and benzotriazole resin deterioration inhibitors having an absorption peak wavelength of 340 nm or more (particularly preferably 350 nm or more) are more preferable. . As a benzotriazole-based resin deterioration inhibitor having an absorption peak wavelength of 320 nm or more, SEESORB 701 (342 nm (absorption peak wavelength)), SEESORB 709 (343 nm), SEESORB 706 (344 nm), SEESORB 704 (345 nm), SEESORB 707 346 nm), SEES ORB 702 (351 nm), SEES ORB 702 L (352 nm), SEES ORB 703 (354 nm) and the like can be suitably used. An error of about ± 5 nm may occur in the absorption peak wavelength depending on the conditions of the apparatus to be measured and the method of forming the organic glass.

  It is preferable that content with respect to the functional resin layer 15 of the ultraviolet absorber whose absorption peak wavelength is 320 nm or more is 0.1-3.0 mass%. It is because ultraviolet rays can be cut and yellowing of the eyeglass material can be suppressed. If the content of the ultraviolet light absorber is less than 0.1% by mass, there is a possibility that the ultraviolet light can not be cut sufficiently. On the other hand, if it exceeds 3.0% by mass, the spectacle material may be yellowed. More preferably, it is 0.2-2.5 mass%, More preferably, it is 0.5-1.5 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, and for example, squalilium type, azomethine type, cyanine type, xanthene type, tetraazaporphyrin type, pyromethene type, isoindolinone type, quinacridone type, diazo A keto pyrrolopyrrole type, an anthraquinone type, a dioxazine type etc. can be used. Any of those commercially available can be used according to the wavelength of the absorption peak wavelength, and specific wavelength absorbers marketed by Tokyo Chemical Industry Co., Ltd., Yamamoto Chemical Co., Ltd., Yamada Chemical Industry Co., Ltd., etc. are used. 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 the wavelength range of 400 to 500 nm. As a specific wavelength absorber having an absorption peak wavelength in a 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 Industry Co., Ltd. , FDB-005 (452 nm), FDB-006 (473 nm), FDB-007 (496 nm) and the like can be used.

  Moreover, the spectacles material of embodiment has a function which selectively cuts the glare light by containing the specific wavelength absorber which has an absorption peak wavelength in a wavelength range 565-605 nm, and can improve an appearance. It becomes a thing. NeoContrast (Mitsui Chemical Co., Ltd., absorption peak wavelength: 580 nm) can be used as a specific wavelength absorber having an absorption peak wavelength in the wavelength range of 565 to 605 nm. Details of NeoContrast are described in Japanese Patent No. 5778109 and US Patent No. 7506977. An error of about ± 5 nm may occur in the absorption peak wavelength depending on the conditions of the apparatus to be measured and the method of forming the organic glass.

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

  Although integration to the organic glass base material 11 of the functional resin layer 15 was performed by the cast molding method, it can also be performed by general methods, such as a dipping method and a spray method. The cast molding method is a method of forming a cavity 21 of a mold in the organic glass substrate 11 and molding it 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 constant gap is formed on the outside of the first mold 11, and the first mold 11 and the second mold 17 The circumferential clearance is sealed by taping 19 or the like.

  The gap of the cavity 21 is set depending on the flow characteristics of the functional resin and the functionality required of the functional resin layer 15, but is preferably 0.2 to 3.0 mm. Since the gap of the cavity 21 is secured to such an extent that injection is easy, cast molding can be performed instantaneously, and since the injected functional resin can be cured without flowing, the eyeglass material is This is because it is possible to suppress the occurrence of a phenomenon (the occurrence of a portion having a different refractive index). If it is less than 0.2 mm, injection may become difficult even with a resin having excellent fluidity. On the other hand, when it exceeds 3.0 mm, there is a possibility that striae may occur due to uneven curing due to the flow of the functional resin. More preferably, it is 0.3-1.5 mm, More preferably, it is 0.4-1.0 mm.

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

  Hereinafter, the present invention will be described in more detail by way of 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.

  Commercial 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 indices of resin materials for the abbreviations are described below. “MR-10” (thiourethane resin manufactured by Mitsui Chemicals, Inc., refractive index: 1.67), “MR-20” (thiourethane resin manufactured by Mitsui Chemicals, Inc., refractive index: 1.60), “MR -95 "(Mitsui Chemical Co., Ltd. thiourethane resin, refractive index: 1.60)," MR-174 "(Mitsui Chemical Co., Ltd. episulfide resin, refractive index: 1.74)," NK-11P " (Nihon Shimizu Sangyo Co., Ltd. (meth) acrylate resin, refractive index: 1.56), “CLS 3400” (Mitsubishi Engineering Plastics Co., Ltd. polycarbonate resin, refractive index: 1.59), “XE 3805” -Japan Inc. nylon resin, refractive index: 1.53), "NXT" (Tribex (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.

  A commercial item is used for the ultraviolet absorber used for the functional resin layer 15, and the absorption peak wavelength of the ultraviolet absorber used in Table 1, 2 is described below. SEESORB 701 (manufactured by Sipro Chemical Industries, Ltd., absorption peak wavelength: 342 nm), SEESORB 704 (manufactured by Cipro Chemical Co., Ltd., absorption peak wavelength: 345 nm), SEESORB 702 (manufactured by Cipro Chemical Co., Ltd., absorption peak wavelength: 351 nm) Company-made, absorption peak wavelength: 354 nm).

  A commercial item is used for the specific wavelength absorber used for the functional resin layer 15, and the absorption peak wavelength of the specific wavelength absorber used in Table 2 is described below. FDB-001 (Yamada Chemical Industry Co., Ltd., absorption peak wavelength: 420 nm), FDB-002 (Yamada Chemical Industry Co., Ltd., absorption peak wavelength: 431 nm), FDB-003 (Yamada Chemical Industry Co., Ltd., absorption peak wavelength) : 437 nm), NeoContrast (manufactured by Mitsui Chemicals, Inc., absorption peak wavelength: 580 nm).

  The molding of the organic glass substrate 11 is carried out by a cast molding method, and the mold is subjected to taping with an adhesive tape so that the distance between the center of the lens is 1.0 mm between the convex side mold and the concave side mold A mold having a cavity for forming an organic glass substrate was produced.

  The organic glass substrate 11 is mixed according to the composition of Table 1 and injected into a mold, and heat curing is carried out at 120 ° C. for 2 hours at 120 ° C. and for 1 hour at 80 ° C. for (meth) acrylates. Molded. A cast molded article was used as the polycarbonate resin, the polyamide resin and the polyurea resin.

  The cast molding of the functional resin layer 15 on the organic glass substrate 11 forms a cavity 21 of a mold in the organic glass substrate 11 and injects and cures a functional resin for forming the functional resin layer 15 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 in forming the organic glass substrate 11 so that a constant gap is formed on the outside of the first mold 11 And the circumferential gap between the first mold 11 and the second mold 17 is sealed by taping 19.

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

The eyeglass material of a test example is created by the combination of the organic glass base material 11 and the functional resin layer 15 which are described below, about these, an ultraviolet cut rate, a 420 nm cut rate, and visible light transmittance as optical property evaluation performance. The degree of yellowness (YI) was determined as an evaluation of appearance, and the adhesion was measured as an evaluation of strength.
<UV cut rate, 420 nm cut rate, visible light transmittance>
The spectral transmittance curve (transmittance of light for each wavelength of the eyeglass material) is determined according to the following equipment and standards, and the UV cut rate is the average cut rate (rate of non-transmission) for light of 280 to 400 nm, 420 nm cut The rate was a cut rate for light of 420 nm, and the visible light transmittance was an average transmittance for light of 380 to 780 nm. In addition, since it is measurement of an optical characteristic, a measurement position was made into the geometric center of spectacles material.

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

  The 420 nm cut rate was evaluated as follows. ◎: 40% or more, :: 30% or more and less than 40%, Δ: 20% or more and less than 30%, x: less than 20%. If the eye is exposed to blue light (420 nm) for a long time, the eye and biological rhythm may be affected, so the 420 nm cut rate is better evaluated as the value is higher.

The visible light transmittance was evaluated as follows. ◎: 85% or more, :: 80% or more and less than 85%, Δ: 70% or more and less than 80%, x: less than 70%. When the visible light transmittance is low, the field of view becomes dark, so the visible light transmittance is evaluated favorably as the numerical value is high.
<Yellow degree (YI)>
The tristimulus values (XYZ) of color were measured by the following apparatus, and the yellowness (YI) was calculated and determined from the following specifications. The measurement position was set 5 mm inside (periphery) from the thickest outer periphery and the thickest outer periphery of the thinnest eyeglass material in thickness of the eyeglass material.

-Device: Spectrophotometer U-4100 (manufactured by Hitachi High-Tech Science Co., Ltd.)
・ Standards: Plastics-How to determine yellowness and yellowing degree (JIS K 7373: 2006)
And yellowness (YI) was evaluated as follows. ◎: less than 6, :: 6 or more and less than 8, Δ: 8 or more and less than 10, x: 10 or more. As the degree of yellowness (YI) increases as the yellowness increases, the lower the value of yellowness (YI), the better the evaluation.
<Adhesiveness>
The adhesion was evaluated by giving an impact to the functional resin layer 15 side of the spectacles material and evaluating the peeling state of the functional resin layer 15 or the like. The impact was given by leaving the spectacles material on a floor or the like and dropping an iron ball with a height of 1 m to 500 g.

  And adhesion was evaluated as follows. :: no abnormality, ○: scratches are found in the functional resin layer 15, :: loss of the functional resin layer 15 is observed, the area is less than 5% of the whole, x: loss of the functional resin layer 15 is seen 5% of the whole area.

  Test examples are described below. Test Examples 1 to 4 and 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. The combination of the organic glass substrate and the functional resin layer and the results of the evaluation performance are described in Table 3.

  Test Examples 1 to 4 were obtained by forming a functional resin layer containing an ultraviolet light absorber having an absorption peak wavelength of 351 nm and a specific wavelength light absorber having an absorption peak wavelength of 420 nm on various organic glass substrates It is. Even though the ultraviolet light is sufficiently cut by the ultraviolet light absorber and the blue light (420 nm) is sufficiently cut by the ultraviolet light absorber and the specific wavelength light absorber, the visibility (visible light transmittance) of the visible light is secured. It had been. In addition, since the thickness of the functional resin layer containing the ultraviolet light absorber is thin, yellowing (yellowness) can be suppressed in both the center which is the thin part of the eyeglass material and the outer periphery which is the thick part. Also, the adhesion was good.

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

  In Test Examples 5 to 8, as compared with Test Examples 1 to 4, since the functional resin layer containing the ultraviolet light absorber was not provided, it was not possible to sufficiently cut the ultraviolet light and the blue light. 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 the ultraviolet absorber is added to the organic glass substrate without providing the functional resin layer. The results of the evaluation performance for organic glass substrates are described in Table 5.

  Since the ultraviolet absorber was able to be cut since the ultraviolet absorber was added to the organic glass base material in comparison with the test examples 1 to 4 in the test examples 9 to 12, the ultraviolet absorber was used for the thick organic glass base material The base lens has become yellowed to the outer periphery due to the addition of 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, and a specific wavelength absorber is added to the functional resin layer in comparison with Test Examples 1 to 4. It differs in the point which is not. The combination of the organic glass substrate and the functional resin layer, and the results of the evaluation performance are described in Table 6.

  In Test Examples 13 to 28, although a specific wavelength absorber is not added to the functional resin layer as compared with Test Examples 1 to 4, an ultraviolet absorber having an absorption peak wavelength on the long wavelength side is added. By this, blue light could be cut to some extent. In addition, the test example which used episulfide type resin and (meth) acrylate type resin for the functional resin layer became what has a little inferior adhesiveness.

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

  The test examples 29 to 31 were able to cut the blue light sufficiently although the absorption peak wavelength of the specific wavelength absorbent was different compared to the test example 3.

(Test Examples 32-36)
Test Examples 32-36 are test examples in which the amount of the ultraviolet absorber added is changed. Compared with Test Example 3, the addition of the specific wavelength absorber and the addition amount of the ultraviolet absorber differ. The combination of the organic glass substrate and the functional resin layer, and the results of the evaluation performance are described in Table 8.

  Compared with Test Example 3, in Test Example 32 in which the addition amount of the ultraviolet light absorber is small, the cutting performance of ultraviolet light and blue light is inferior, and in Test Example 36 in which the addition amount of the ultraviolet light absorber is large, the functional resin layer has an outer periphery It became slightly yellowish.

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

  In Test Example 37 in which the thickness of the functional resin layer is smaller than in Test Example 3, the cutting performance of ultraviolet light and blue light is inferior, and although not described in the table, casting can be performed instantaneously. It was not possible to work and it became somewhat inferior. In Test Example 41 in which the thickness of the functional resin layer is large, a slight yellowing is observed around the outer periphery of the functional resin layer, and although not described in the table, the stria is small due to uneven curing due to the thickness. Occurred.

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

  In Test Examples 42 to 45, although the ultraviolet light is sufficiently cut by the ultraviolet light absorber, and the blue light (420 nm) is sufficiently cut by the ultraviolet light absorber and FDB-001 of the specific wavelength light absorber, visible The view of light (visible light transmittance) was secured. These were those containing NeoContrast, which is a specific wavelength absorber, and the appearance of the eyeglass material was improved. In addition, since the thickness of the functional resin layer containing the ultraviolet light absorber is thin, yellowness (yellowness) can be suppressed in both the center which is the thin part of the eyeglass material and the outer periphery which is the thick part. Furthermore, even if the organic glass substrate is a polycarbonate resin (CLS3400), a polyamide resin (XE3805), or a polyurea resin (NXT), the adhesion is good.

  11: Organic glass base material (first mold), 15: functional resin layer, 17: second mold, 19: taping, 21: cavity.

Claims (6)

In the eyeglass material in which the functional resin layer is integrated on one side or both sides of the organic glass substrate which 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 is characterized in that the degree of yellowness (YI) is less than 10.   The UV absorber having an absorption peak wavelength of 320 nm or more is a benzotriazole-based UV absorber, and the content of the UV absorber in the functional resin layer is 0.1 to 3.0% by mass. The spectacles material of Claim 1 characterized by the above-mentioned.   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.   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 formed of a thiourethane-based, episulfide-based or (meth) acrylate-based thermosetting resin raw material,
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 raw material.   The thickness of the said functional resin layer is 0.2-3.0 mm, The eyeglass material of Claim 1 characterized by the above-mentioned.

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