JP2014048479A - Spectacle lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spectacle lens satisfactory in scratch resistance.SOLUTION: The spectacle lens comprises: a lens base material; a hard coating layer provided on the lens base material directly or via other layer; an anti-reflection layer provided on the hard coating layer; and an anti-fouling layer provided on the anti-reflection layer. The Mohs hardness of the spectacle lens is not less than 3 but less than 5 where the surface of the anti-foul layer is rubbed reciprocally not fewer than one time but not more than five times using a polishing member used for Mohs hardness evaluation while a load of 500 gf is applied in a contact area of 1.0 mm×1.0 mm.

Description

  The present invention relates to a spectacle lens.

Some spectacle lenses are provided with a hard coat layer on the surface of a lens substrate, an antireflection layer on the hard coat layer, and an antifouling layer on the antireflection layer.
Of the layers provided on the lens substrate, the hard coat layer is mainly used for improving scratch resistance.

A conventional spectacle lens has a base lens and an inorganic hydrophilic hard layer formed on the surface of the base lens in order to obtain good antifogging properties and water washing properties, and the inorganic hydrophilic hard layer is oxidized. There exists an example containing the photocatalyst suppression component with respect to the photocatalytic action of titanium and a titanium oxide (patent document 1).
In the lens of Patent Document 1, the thickness of the inorganic hydrophilic hard layer is 10 ^{−3 to} 0.5 μm, and the Mohs hardness may be in the range of 5 to 9 in order to obtain scratch resistance of a normal lens. Have been described.
Here, the Mohs hardness is a hardness that scratches the measurement object in order with 10 types of minerals (abrasive members) having a hardness of 1 to 10 and visually determines whether the measurement object is scratched or not. Is the standard. However, there is no standard standardized by JIS etc. regarding the conditions of the scratch test.

JP 2003-15092 A

In Patent Document 1, the Mohs hardness of the inorganic hydrophilic hard layer is set to 5 to 9 in order to obtain the same scratch resistance as that of a lens having a normal hard layer. However, since there is no description of how the test was specifically carried out in Patent Document 1, it cannot be said that the hardness is specified. A spectacle lens having a normal hard layer is easily damaged when it comes into contact with a hard object, and thus a spectacle lens with further excellent scratch resistance is required.
Even if the hard layer of Patent Document 1 has a higher Mohs hardness than a normal spectacle lens, in the embodiment of Patent Document 1, an acid is mixed with fluoride to form the hard layer on a lens substrate. It is impossible to reproduce the embodiment as it is because a dangerous method is described. Therefore, even with reference to Patent Document 1, it is not always possible to realize a spectacle lens having scratch resistance higher than that of a normal lens.

  An object of the present invention is to provide a spectacle lens having good scratch resistance.

  One aspect of the present invention is a spectacle lens, a lens base material, a hard coat layer provided directly or via another layer on the lens base material, and an antireflection layer provided on the hard coat layer And an antifouling layer provided on the antireflection layer, and using a polishing member used for Mohs hardness evaluation, the surface of the antifouling layer is subjected to a load of 500 gf with a contact area of 1.0 mm × 1.0 mm. The spectacle lens has a Mohs hardness of 3 or more and less than 5 when rubbed for 1 to 5 reciprocations.

  Another aspect of the present invention is an eyeglass lens, which is provided on a lens base material, a hard coat layer provided directly or via another layer on the lens base material, and the hard coat layer. And an antifouling layer provided on the antireflection layer, and the surface of the antifouling layer is 1.0 mm × 1.0 mm using a polishing member having a Mohs hardness of 3 to less than 5. It is a spectacle lens in which the spectacle lens is not damaged when it is rubbed for 1 to 5 reciprocations with a contact area of 500 gf applied.

  In the present specification, the Mohs hardness is a standard of scratch resistance evaluated by a scratch test using a set of 10 kinds of minerals (abrasive members) having different hardnesses used for the Mohs hardness evaluation. That is, the Mohs hardness is to visually determine whether or not the spectacle lens is scratched by rubbing ten kinds of minerals (polishing members) having different hardnesses against the surface of the spectacle lens to be evaluated. As the ten kinds of minerals (abrasive members), those commercially available for evaluation of Mohs hardness can be used. Number 1 is talc, number 2 is gypsum, number 3 is calcite, number 4 is fluorite, number 5 is apatite, number 6 is orthoclase, number 7 is quartz, number 8 is jade, number 9 is corundum, number 10 is It is a diamond and the number is the Mohs hardness of each stone. That is, the hardness of the mineral increases as the number increases.

  As a result of the scratch test, when the generation of cutting powder or peeling of the layer is not visible, it is determined that the test is acceptable, that is, there is no scratch (no scratch). As a result of the scratch test, when the generation of cutting powder or peeling of the layer can be visually observed, it is judged as rejected, that is, it is judged that there is a flaw (scratched). Here, the cutting powder refers to powder or debris generated by scraping at least one of an antifouling layer, an antireflection layer, a hard coat layer, a primer layer, a lens substrate, and other layers included in the spectacle lens. . Further, “peeling” of a layer means that a part or the whole of at least one layer of the spectacle lens layer is peeled off. Therefore, the phrase “the eyeglass lens is scratched” is not limited to the case where the lens substrate is scratched, but one or more of the antifouling layer, the antireflection layer, the hard coat layer, the primer layer, and other layers. This includes cases where cutting powder or peeling occurs. As a result of the scratch test, even if a groove (dent) is formed on the surface of the spectacle lens, if no cutting powder or peeling is visually recognized, it is determined that there is no scratch.

  In these configurations, a scratch test is performed in which the contact area between the polishing member and the antifouling layer is 1.0 mm × 1.0 mm, and a load of 500 gf (gram weight, 500 gf≈4.90332 N) is applied to rub between 1 and 5 cycles. In practice, when apatite having a Mohs hardness of 5 is used, at least a part of the spectacle lens layer is peeled off or cutting powder is generated, and the spectacle lens (hereinafter also simply referred to as “lens”) is damaged. When fluorite with Mohs hardness of 4 or calcite with Mohs hardness of 3 is used, the lens lens layer is not peeled off or cutting powder is not generated, and the lens is not damaged. The reason why the Mohs hardness is 3 or more is that the commercially available spectacle lens product has a high Mohs hardness of less than 3. Therefore, the scratch resistance of the spectacle lens can be improved by setting the Mohs hardness to 3 or more. That is, by setting the Mohs hardness of the spectacle lens to 3 or more and less than 5, it is possible to improve the scratch resistance of the spectacle lens including the hard coat layer, the antireflection layer, and the antifouling layer.

  In the above aspect, the Mohs hardness is preferably 4 or more and less than 5.

  With this configuration, scratch resistance can be further improved in the spectacle lens including the hard coat layer, the antireflection layer, and the antifouling layer.

  Another aspect of the present invention is a spectacle lens, comprising a lens base material and a hard coat layer provided on the lens base material directly or via another layer, and used for Mohs hardness evaluation The Mohs hardness of the spectacle lens when the surface of the hard coat layer is rubbed for 1 to 5 reciprocations with a load of 500 gf with a contact area of 1.0 mm × 1.0 mm using a member is 3 to less than 6. There is a spectacle lens.

  In this configuration, when the contact area between the feldspar with Mohs hardness of 6 and the hard coat layer is 1.0 mm × 1.0 mm and rubbed for 1 to 5 reciprocations under a load of 500 gf, at least the spectacle lens layer Part may be peeled off or cutting powder may be generated, and the spectacle lens may be scratched, but if the same is rubbed with apatite having Mohs hardness of 5, the spectacle lens layer may be peeled off or cutting powder may be generated. In addition, since the lens is not scratched, the scratch resistance of the spectacle lens can be improved. In other words, by setting the Mohs hardness of the spectacle lens to 3 or more and less than 6, it is possible to improve the scratch resistance of the spectacle lens in which the hard coat layer is provided on the lens substrate directly or via another layer.

  In the above aspect, the Mohs hardness is preferably 5 or more and less than 6.

  With this configuration, the scratch resistance can be further improved in the spectacle lens in which the hard coat layer is provided on the lens substrate directly or via another layer.

  In the above aspect, the thickness of the hard coat layer is preferably 6 μm or more and 40 μm or less.

  Here, the “layer thickness” of the hard coat layer refers to the hard coat layer in a direction perpendicular to the tangent plane, assuming a tangent plane of the lens substrate in a region where the spectacle lens scratch test is performed (performed). Is the maximum thickness. In the spectacle lens before being processed to match the frame shape of the spectacles, when a scratch test is performed at or around the geometric center of the spectacle lens, the spectacle lens passes through the geometric center and passes through the geometric center. The thickness (so-called center thickness) of the hard coat layer in the direction parallel to the optical axis may be used as the layer thickness.

  As a result of intensive studies by the present inventors, the Mohs hardness of the spectacle lens including the antireflection layer and the antifouling layer may be 3 or more and less than 5 by setting the thickness of the hard coat layer to 6 μm or more and 40 μm or less. It became clear that we could do it. That is, it is possible to provide a spectacle lens that is not damaged when rubbed with a polishing member having a Mohs hardness of 3 or more and less than 5. Moreover, the Mohs hardness at the time of performing the scratch test which rubs the surface of a hard-coat layer can be 3 or more and less than 6.

  In the above aspect, the hard coat layer preferably has a thickness of 10 μm or more and 40 μm or less.

  With this configuration, the Mohs hardness of the spectacle lens including the antireflection layer and the antifouling layer can be 4 or more and less than 5. Further, the Mohs hardness of the spectacle lens when the scratch test is performed to rub the surface of the hard coat layer can be 5 or more and less than 6. Therefore, a spectacle lens with better scratch resistance can be realized.

Sectional drawing of the principal part of the spectacle lens concerning 1st Embodiment of this invention. (A) is a schematic diagram explaining a scratch test, (B) is an enlarged view of the principal part of (A). Sectional drawing of the principal part of the spectacle lens concerning 2nd Embodiment of this invention.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a main part of a spectacle lens according to a first embodiment of the present invention.
In FIG. 1, a spectacle lens 1 includes a plastic lens substrate 10, a primer layer 11 provided on the surface of the lens substrate 10, a hard coat layer 12 provided on the surface of the primer layer 11, and a hard coat. The antireflection layer 13 provided on the surface of the layer 12 and the antifouling layer 14 provided on the surface of the antireflection layer 13 are provided. In the present embodiment, the primer layer 11 may be omitted, and the hard coat layer 12 may be provided on the surface of the lens substrate 10. Here, the “surface of the layer” means a surface of the layer far from the lens base material 10. The “surface of the lens substrate 10” means a concave surface or a convex surface of the lens substrate. “The surface of the spectacle lens 1” means the surface of the layer farthest from the lens substrate 10 among the layers formed on the spectacle lens 1. In the following, the expression “upper” may be used in the same meaning as “surface”.

(Lens base material)
The material of the lens substrate 10 is not particularly limited, but includes (meth) acrylic resin, allyl carbonate resin such as styrene resin, carbonate resin, allyl resin, diethylene glycol bisallyl carbonate resin (CR-39), and vinyl resin. , Polyester resins, polyether resins, urethane resins obtained by reaction of isocyanate compounds with hydroxy compounds such as diethylene glycol, thiourethane resins obtained by reacting isocyanate compounds with polythiol compounds, and one or more disulfide bonds in the molecule Examples thereof include a transparent resin obtained by curing a polymerizable composition containing a (thio) epoxy compound. Among these lens substrates, obtained by curing a polymerizable composition containing a thiourethane resin obtained by reacting an isocyanate compound and a polythiol compound and a (thio) epoxy compound having one or more disulfide bonds in the molecule. The transparent resin obtained is preferable as a lens substrate having a high refractive index. As a specific example of a thiourethane resin obtained by reacting an isocyanate compound with a polythiol compound, for example, a product name “Seiko Super Sovereign (SSV)” (manufactured by Seiko Optical Products Co., Ltd., refractive index 1.67, “Super Sovereign” is registered. Example of a lens base material used in a lens base material used in the trademark), a product name “Seiko Super Lucius” (manufactured by Seiko Optical Products Co., Ltd., refractive index 1.60, “Lucious” is a registered trademark) be able to. Further, as a specific example of a transparent resin obtained by curing a polymerizable composition containing a (thio) epoxy compound having one or more disulfide bonds in the molecule, for example, the product name “Seiko Prestige” (Seiko Optical Products Co., Ltd.) A lens base material manufactured by a company and having a refractive index of 1.74 and “Prestige” is a registered trademark) can be exemplified.

(Primer layer)
The primer layer 11 is formed on the surface of the lens substrate 10. That is, the primer layer 11 is present between the lens substrate 10 and the hard coat layer 12 and improves the adhesion between them. Furthermore, since the external impact is absorbed, it has the property of improving the impact resistance of the spectacle lens 1.
Such a primer layer 11 is preferably formed using a coating composition containing an organic resin polymer having polarity and metal oxide fine particles containing titanium oxide.
The organic resin polymer expresses adhesion to both the lens substrate 10 and the hard coat layer 12. The metal oxide fine particles can act as a filler to improve the crosslinking density of the primer layer 11 and improve water resistance, weather resistance, and light resistance. As the organic resin polymer, various resins such as a polyester resin, a polyurethane resin, an epoxy resin, a melamine resin, a polyolefin resin, a urethane acrylate resin, and an epoxy acrylate resin can be used. On the other hand, as the metal oxide fine particles containing titanium oxide, it is preferable to use a composite type containing titanium oxide having a rutile crystal structure from the viewpoint of light resistance.

In applying the primer coating composition (primer solution), the surface of the lens substrate 10 is previously subjected to alkali treatment, acid treatment, surfactant treatment for the purpose of improving the adhesion between the lens substrate 10 and the primer layer 11. It is effective to perform a peeling / polishing process or a plasma process using inorganic or organic fine particles. Further, as a method for applying / curing the primer solution, the primer solution is applied by an inkjet method, a dipping method, a spin coat method, a spray coat method, a roll coat method, or a flow coat method, and then a temperature of 40 to 200 ° C. The primer layer 11 can be formed by heating / drying for several hours.
The thickness of the primer layer 11 is preferably in the range of 0.1 to 30 μm. If the primer layer 11 is too thin, basic performance such as water resistance and impact resistance cannot be realized. Conversely, if the primer layer 11 is too thick, surface smoothness may be impaired, and appearance defects such as optical distortion, white turbidity, and cloudiness may occur. There is a case to do. In order to improve the adhesion between the lens substrate 10 and the hard coat layer 12, 0.1 to 2 μm is more preferable. The refractive index of the primer layer 11 is preferably close to the refractive index of the lens base material 10 in order to suppress the generation of interference fringes. Moreover, you may add coloring materials, such as dye and a pigment, a photochromic compound, etc. to the primer layer 11 as needed.

(Hard coat layer)
The hard coat layer 12 is formed on the surface of the primer layer 11 using a hard coat coating composition (hard coat liquid) containing metal oxide fine particles. Examples of the metal oxide fine particles include titanium oxide (TiO ₂ ), silicon oxide (SiO ₂ ), tin oxide (SnO ₂ ), and zirconium oxide (ZnO ₂ ). These may be used alone or as composite fine particles.
Further, the metal oxide fine particles in the hard coat liquid are preferably dispersed in a resin binder made of an organic silicon compound or the like as a raw material.
Examples of the organosilicon compound include vinyl trialkoxysilane, vinyltrichlorosilane, vinyltri (β-methoxy-ethoxy) silane, allyltrialkoxysilane, acryloxypropyltrialkoxysilane, methacryloxypropyltrialkoxysilane, and 3-glycid. Examples include xylpropyltrialkoxysilane, β- (3,4-epoxycyclohexyl) -ethyltrialkoxysilane, mercaptopropyltrialkoxysilane, γ-aminopropyltrialkoxysilane, and the like.

And when preparing the hard-coat liquid containing a metal oxide fine particle and an organosilicon compound, it is preferable to mix the sol in which the metal oxide fine particle is dispersed and the organosilicon compound. The compounding amount of the metal oxide fine particles is determined in accordance with the strength, refractive index and the like of the hard coat layer 12. The metal oxide fine particles may be spherical or a chain in which a plurality of particles are connected. Examples of the sol in which the metal oxide fine particles are dispersed include a spherical SiO ₂ sol (product name “ST-S” manufactured by Nissan Chemical Industries, Ltd.). ).
The hard coat layer 12 may further contain not only the metal oxide fine particles and the organic silicon compound but also a polyfunctional epoxy compound. Examples of the polyfunctional epoxy compound include aliphatic epoxy compounds such as 1,6-hexanediol diglycidyl ether and ethylene glycol diglycidyl ether, isophoronediol diglycidyl ether, and bis-2,2-hydroxycyclohexylpropane diglycidyl ether. And aromatic epoxy compounds such as resorcin diglycidyl ether, bisphenol A diglycidyl ether, and cresol novolac polyglycidyl ether.

Further, a curing catalyst may be added to the hard coat layer 12. Examples of the curing catalyst include perchloric acids such as perchloric acid, ammonium perchlorate, and magnesium perchlorate, Cu (II), Zn (II), Co (II), Ni (II), and Be (II). Ce (III), Ta (III), Ti (III), Mn (III), La (III), Cr (III), V (III), Co (III), Fe (III), Al (III) Acetylacetonate having a central metal atom such as Ce (IV), Zr (IV), V (IV), amino acids such as amine and glycine, Lewis acid, organic acid metal salts and the like.
The hard coat solution thus obtained can be used after diluting in a solvent, if necessary. As the solvent, solvents such as alcohols, esters, ketones, ethers and aromatics are used. In addition, the hard coat solution may contain a small amount of metal chelate compound, surfactant, antistatic agent, ultraviolet absorber, antioxidant, disperse dye, oil-soluble dye, pigment, photochromic compound, hindered amine, hindered as required. Addition of a light-resistant and heat-resistant stabilizer such as a phenol type can also improve the coating properties of the hard coat solution, the curing speed, and the coating performance after curing.

As a method of applying and curing the hard coat solution, after applying the hard coat solution by an ink jet method, a dipping method, a spin coat method, a spray coat method, a roll coat method, or a flow coat method, the temperature is 40 to 200 ° C. The hard coat layer 12 is formed by heating and drying for several hours. For example, the hard coat liquid 12 is ultrasonically sprayed on the primer layer 11 formed on the lens substrate 10 or on the lens substrate 10 and dried to form the hard coat layer 12.
The layer thickness of the hard coat layer 12 is 6 μm or more and 40 μm or less. If the layer thickness is less than 6 μm, the Mohs hardness is insufficient and sufficient scratch resistance cannot be obtained. In addition, it is difficult for the layer thickness to exceed 40 μm due to film formation problems such as difficulty in making the layer thickness uniform. The layer thickness of the hard coat layer 12 is more preferably 10 μm or more and 40 μm or less. Compared with the case where the film thickness is 6 μm or more and less than 10 μm, the Mohs hardness can be further increased, so that the scratch resistance can be improved.

(Antireflection layer)
The antireflection layer 13 is formed by alternately laminating a low refractive index layer having a refractive index of 1.3 to 1.5 and a high refractive index layer having a refractive index of 1.8 to 2.3, for example. (In the figure, the plurality of stacked layers are collectively shown as the antireflection layer 13). The number of layers is preferably about 5 or 7 layers.
Examples of inorganic substances constituting the antireflection layer 13 include SiO ₂ , SiO, ZrO ₂ , TiO ₂ , TiO, Ti ₂ O ₃ , Ti ₂ O ₅ , Al ₂ O ₃ , TaO ₂ , Ta ₂ O ₅ , and NbO. Nb ₂ O ₃ , NbO ₂ , Nb ₂ O ₅ , CeO ₂ , MgO, Y ₂ O ₃ , SnO ₂ , MgF ₂ , WO _{3 and the} like. These inorganic substances are used alone or in combination of two or more. For example, the low refractive index layer may be a SiO ₂ layer and the high refractive index layer may be a TiO ₂ layer.
Examples of a method for forming such an antireflection layer 13 include a vacuum deposition method, an ion plating method, and a sputtering method. In the vacuum vapor deposition method, an ion beam assist method in which an ion beam is simultaneously irradiated during vapor deposition may be used.

(Anti-fouling layer)
The antifouling layer 14 is a layer made of a fluorine-containing silane compound formed on the antireflection layer 13 for the purpose of improving the water / oil repellency of the lens surface. As a fluorine-containing silane compound, the Shin-Etsu Chemical Co., Ltd. product name "KY-130" can be illustrated, for example.

(Mohs hardness)
The spectacle lens 1 has a Mohs hardness of 3 or more and less than 5. That is, the surface of the spectacle lens 1 (surface of the antifouling layer 14) is applied to the surface of the spectacle lens 1 (surface of the antifouling layer 14) by a polishing member having a Mohs hardness of 3 or more and applied with a weight of 500 gf. Thus, scratches do not occur when rubbed between 1 and 5 reciprocations, and scratches occur when similarly rubbed with a polishing member having a Mohs hardness of 5. The spectacle lens 1 has a Mohs hardness of 4 or more and less than 5 when the thickness of the hard coat layer 12 is 10 μm or more and 40 μm or less.

  FIG. 2A is a schematic diagram illustrating a scratch test. FIG. 2B is an enlarged view of a portion (main part) indicated by X in FIG. In the scratch test, the polishing member (mineral) for Mohs hardness evaluation may be held by hand and rubbed against the surface of the spectacle lens. However, as shown in FIGS. 2 (A) and 2 (B), the polishing member P It is preferable to use the evaluation instrument Q attached to the shaft. The evaluation instrument Q may be provided with a spring on the shaft so that the load in the scratch test can be easily adjusted, or a scale can be provided to easily check the load. In the present embodiment, the shape of the portion of the polishing member P that contacts the spectacle lens 1 is processed to adjust the contact area.

  In the scratch test, the polishing member P is reciprocated (arrow S) in a state where a predetermined load (arrow R) is applied and in contact with the surface of the spectacle lens 1. That is, the polishing member P is moved between a point A and a point B on the surface of the spectacle lens 1 with a weight of 500 gf applied. Since the polishing member P is processed, the contact area when the polishing member P is brought into contact with the point A or the point B is 1.0 mm × 1.0 mm. The points A and B are two arbitrary points on the surface of the spectacle lens 1. However, when evaluating the performance of the lens 1, it is preferably a point that is 5 mm or more inside from the periphery of the lens 1. Further, it is preferable that the trajectories when the polishing member P is reciprocated overlap as much as possible, but there may be a portion that does not overlap.

  After moving the polishing member P between 1 and 5 reciprocations, it is visually confirmed whether or not the lens 1 is damaged. The scratch test is performed in order from the polishing member P having a lower hardness, and ends when it is determined that the scratch has been made. In order to maintain the accuracy of the test, when the test is performed with one polishing member P, it is preferable that the next test using the polishing member P is performed at a position that does not overlap the trajectory of the previous test. When the n-th (1 ≦ n ≦ 10, n is an integer) polishing member P is not damaged, the Mohs hardness of the spectacle lens 1 when the n + 1-th polishing member P is damaged is determined to be n or more and n + 1 or less. To do. However, since the polishing member P is up to No. 10 (diamond), it is determined that the number is 10 or more when the No. 10 is not damaged. For example, when the spectacle lens 1 is scratched for the first time when the polishing member P with Mohs hardness 2 is used and the polishing member P with Mohs hardness 5 is used, the Mohs hardness is 4 or more and less than 5. At this time, it is not always necessary to perform the test with the polishing member P having a Mohs hardness of 6.

  As described above, the Mohs hardness is an index for evaluating the relative hardness between the polishing member and the evaluation object (lens in the present specification).

Next, a second embodiment of the present invention will be described with reference to FIG.
The second embodiment is different from the first embodiment in that there is no antireflection layer and antifouling layer, and the surface of the hard coat layer becomes the surface of the lens. Note that in the second embodiment, components similar to those in the first embodiment are denoted by the same reference numerals as in the first embodiment, and description thereof is omitted.
FIG. 3 shows a main part of a spectacle lens according to a second embodiment of the present invention.
In FIG. 3, the spectacle lens 2 includes a plastic lens substrate 10, a primer layer 11 provided on the lens substrate 10, and a hard coat layer 22 provided on the primer layer 11. In the second embodiment, the primer layer 11 may be omitted, and the hard coat layer 22 may be provided on the lens substrate 10.

The materials of the lens base material 10, the primer layer 11, and the hard coat layer 22 are the same as those in the first embodiment, and the thickness of the hard coat layer 22 is in the range of 6 μm to 40 μm as in the first embodiment. Hardness is different.
That is, the spectacle lens 2 of the second embodiment has a Mohs hardness of 3 or more and less than 6. That is, a scratch test in which the surface of the spectacle lens 2 (the surface of the hard coat layer 22) is rubbed with a polishing member used for Mohs hardness evaluation, and the contact area between the polishing member and the hard coat layer 22 is 1.0 mm × 1.0 mm. The Mohs hardness is 3 or more and less than 6 when the number of scratches is 1 to 5 reciprocations with a weight of 500 gf applied.

  Examples of the present invention will be described below. In the following, in the Mohs hardness evaluation, the n-th (1 ≦ n ≦ 9, n is an integer) polishing member is not damaged, and the Mohs hardness of the spectacle lens when the n + 1-th polishing member is damaged is 2 It is expressed by the average value of the numbers of two abrasive members. For example, the Mohs hardness of the spectacle lens is 2.5 when the second polishing member (gypsum) is not scratched and the third polishing member (calcite) is scratched.

[Example 1]
1. Preparation of hard coat liquid In a stainless steel container, 46 parts by weight of 3-glycidoxypropyltrimethoxysilane (Mentive Performance Materials Japan GK, product name “TSL8350”), 42 parts by weight of 0.05N HCl And stirred well. Next, 86 parts by weight of SiO ₂ sol (spherical SiO ₂ sol manufactured by Nissan Chemical Industries, Ltd., product name “ST-S”), silicone surfactant (product name “L7604” manufactured by Toray Dow Corning Co., Ltd.) 300 ppm, Fe catalyst 0.2 parts by weight, Al catalyst 0.8 parts by weight were added and sufficiently stirred. Further, MeOH was mixed and stirred so that the solid content was 25% to obtain a hard coat solution.

2. Lamination process [1] Lens substrate 10
As the lens substrate 10, a plastic lens substrate for eyeglasses having a refractive index of 1.67 (manufactured by Seiko Optical Products Co., Ltd., product name “Seiko Super Sovereign (SSV)”) was prepared.
[2] Hard coat layer 12
Using an ultrasonic spray coating system “EXACTA COAT” (manufactured by SONO-TEK) as a spray coating device, adjusting the flow rate and liquid solid content of the hard coat layer forming material prepared above by the ultrasonic spray coating method, A coating film was formed on the surface (concave and convex) of the substrate 10. The obtained coating film was baked at 125 ° C. for 5 hours to obtain a hard coat layer 12 having a central film thickness (layer thickness) of 6.5 μm.
[3] Antireflection layer 13
SiO ₂ and TiO ₂ were alternately deposited by a vacuum deposition method to form a total of seven antireflection layers 13.
[4] Antifouling layer 14
By using a pellet material containing a fluorine-containing silane compound (manufactured by Shin-Etsu Chemical Co., Ltd., product name “KY-130”) as a vapor deposition source, it is heated at about 500 ° C. to evaporate KY-130, and the antireflection layer 13 An antifouling layer 14 was formed thereon.

(Scratch test conditions)
Contact area between the polishing member and the surface of the spectacle lens: 1 mm ² (1 mm × 1 mm)
Scratching speed: 15 mm / sec Load: 500 gf (≒ 4.90332N)
Reciprocation of polishing member: 1 to 5 reciprocation

(Mohs hardness: 3.5)
When a scratching test was conducted by applying a polishing member made of fluorite having a Mohs hardness of 4 to the antifouling layer 14 on the surface of the spectacle lens 1, it was observed that the lens was damaged due to peeling or cutting powder. did. On the other hand, when a scratching test was conducted by applying a polishing member made of calcite having a Mohs hardness of 3 to the surface of the spectacle lens 1, the lens surface was not peeled off or cutting powder was not generated, and the lens was scratched. I visually observed that they were not connected.
Therefore, the Mohs hardness of Example 1 is 3.5.

[Example 2]
Compared to Example 1, the thickness of the hard coat layer 12 was changed to 8.0 μm. Other conditions are the same as those in Example 1.
(Mohs hardness: 3.5)
As in Example 1, when a scratching test was performed by applying a polishing member made of fluorite having a Mohs hardness of 4 to the antifouling layer 14 on the surface of the spectacle lens 1, the lens 1 was visually damaged. did. On the other hand, when a scratch test was performed by applying a polishing member made of calcite having a Mohs hardness of 3 to the surface of the spectacle lens 1, it was visually observed that the lens 1 was not damaged.
Therefore, the Mohs hardness of Example 2 is 3.5.

[Example 3]
Compared to Example 1, the thickness of the hard coat layer 12 was changed to 10.0 μm. Other conditions are the same as those in Example 1.
(Mohs hardness: 4.5)
When a scratching test was carried out by applying a polishing member made of apatite having a Mohs hardness of 5 to the antifouling layer 14 on the surface of the spectacle lens 1, it was visually observed that the lens 1 was damaged. On the other hand, when a scratching test was performed by applying a polishing member made of fluorite having a Mohs hardness of 4 to the surface of the spectacle lens 1, it was visually observed that the lens 1 was not damaged.
Therefore, the Mohs hardness of Example 3 is 4.5.

[Example 4]
Compared to Example 1, the thickness of the hard coat layer 12 was changed to 20.0 μm. Other conditions are the same as those in Example 1.
(Mohs hardness: 4.5)
In the same manner as in Example 3, a scratch test was performed by applying a polishing member made of apatite having a Mohs hardness of 5 to the antifouling layer 14 on the surface of the spectacle lens 1, and it was visually observed that the lens 1 was damaged. . On the other hand, when a scratching test was performed by applying a polishing member made of fluorite having a Mohs hardness of 4 to the surface of the spectacle lens 1, it was visually observed that the lens 1 was not damaged.
Therefore, the Mohs hardness of Example 4 is 4.5.

[Example 5]
Compared to Example 1, the thickness of the hard coat layer 12 was changed to 40.0 μm. Other conditions are the same as those in Example 1.
(Mohs hardness: 4.5)
In the same manner as in Example 3, a scratch test was performed by applying a polishing member made of apatite having a Mohs hardness of 5 to the antifouling layer 14 on the surface of the spectacle lens 1, and it was visually observed that the lens 1 was damaged. . On the other hand, when a scratching test was performed by applying a polishing member made of fluorite having a Mohs hardness of 4 to the surface of the spectacle lens 1, it was visually observed that the lens 1 was not damaged.
Therefore, the Mohs hardness of Example 5 is 4.5.

[Example 6]
The layer configuration was changed with respect to Example 1. That is, the spectacle lens 2 has a configuration in which the hard coat layer 22 is provided on the lens substrate 10, and the antireflection layer 13 and the antifouling layer 14 are omitted. The material of the lens substrate 10 and the composition of the hard coat layer 22 are the same as those of the hard coat layer 12 of Example 1, and the layer thickness of the hard coat layer 22 is also the same as the layer thickness of the hard coat layer 12 of Example 6. .5 μm.
(Mohs hardness: 3.5)
When a scratching test was performed by applying a polishing member made of fluorite having a Mohs hardness of 4 to the hard coat layer 22 on the surface of the spectacle lens 2, it was visually observed that the lens 2 was damaged. On the other hand, when a scratching test was performed by applying a polishing member made of calcite having a Mohs hardness of 3 to the surface of the spectacle lens 2, it was visually observed that the lens 2 was not damaged.
Therefore, the Mohs hardness of Example 6 is 3.5.

[Example 7]
Compared to Example 6, the thickness of the hard coat layer 22 was changed to 10.0 μm. Other conditions are the same as in Example 6.
(Mohs hardness: 5.5)
When a scratching test was performed by applying a polishing member made of an orthofeldspar with Mohs hardness of 6 to the hard coat layer 22 which is the surface of the spectacle lens 2, it was visually observed that the lens 2 was damaged. On the other hand, when a scratch test was conducted by applying a polishing member made of apatite having a Mohs hardness of 5 to the surface of the spectacle lens 2, it was visually observed that the lens 2 was not damaged.
Therefore, the Mohs hardness of Example 7 is 5.5.

[Example 8]
Compared to Example 6, the thickness of the hard coat layer 22 was changed to 20.0 μm. Other conditions are the same as in Example 6.
(Mohs hardness: 5.5)
As in Example 7, a scratch test was conducted by applying a polishing member made of orthofeldspar with a Mohs hardness of 6 to the hard coat layer 22 that is the surface of the spectacle lens 2, and it was visually observed that the lens 2 was damaged. did. On the other hand, when a scratch test was conducted by applying a polishing member made of apatite having a Mohs hardness of 5 to the surface of the spectacle lens 2, it was visually observed that the lens 2 was not damaged.
Therefore, the Mohs hardness of Example 7 is 5.5.

[Example 9]
The thickness of the hard coat layer 22 was changed to 40.0 μm with respect to Example 6. Other conditions are the same as in Example 6.
(Mohs hardness: 5.5)
As in Example 7, a scratch test was conducted by applying a polishing member made of orthofeldspar with a Mohs hardness of 6 to the hard coat layer 22 that is the surface of the spectacle lens 2, and it was visually observed that the lens 2 was damaged. did. On the other hand, when a scratch test was conducted by applying a polishing member made of apatite having a Mohs hardness of 5 to the surface of the spectacle lens 2, it was visually observed that the lens 2 was not damaged.
Therefore, the Mohs hardness of Example 7 is 5.5.

In addition, although Examples 1-9 demonstrated what does not have a primer layer, also when the primer layer 11 is provided between the lens base material 10 and the hard-coat layer 12 or the hard-coat layer 22, the same result was gotten.
The primer layer 11 was formed by the following procedure. The other layers and the lens substrate 10 are the same as in Examples 1-9.

-Preparation of primer solution Into a stainless steel container, 130 parts by weight of water, 22 parts by weight of ethylene glycol and 10 parts by weight of isopropanol were added and stirred sufficiently. Then, a polyurethane resin (Daiichi Kogyo Seiyaku Co., Ltd., product name " 14 parts by weight of SF410 ”(average particle size 200 nm) was added and mixed with stirring.

  Furthermore, 1 part by weight of each acetylene-based nonionic surfactant (produced by Air Products Japan Co., Ltd., product name “Surfinol 104E”, and product names “Surfinol 465” and “Surfinol” are registered trademarks) Add 0.5 parts by weight of an ether-modified siloxane surfactant (BIC Chemie Japan Co., Ltd., product name “BYK-348”), continue stirring for 1 hour, and then filter with a 2 μm filter to obtain a primer solution. Obtained.

-Lamination process The obtained primer liquid was filled in the ink cartridge for inkjet printers. The ink cartridge was attached to an ink jet printer (manufactured by Mastermind, product name “MMP813H”), and a primer solution was applied to the lens substrate 10. Subsequently, it was dried at 80 ° C. for 1 hour to form a 0.5 μm primer layer 11.
A hard coat layer 12 or a hard coat layer 22 was formed on the surface of the primer layer 11 in the same manner as in Examples 1-9.

[Comparative Example 1]
Compared to Example 1, the hard coat layer thickness was changed to 2.0 μm. Other conditions are the same as those in Example 1.
(Mohs hardness: 2.5)
When a scratching test was performed by applying a polishing member made of calcite having a Mohs hardness of 3 to the antifouling layer on the surface of the spectacle lens, it was visually observed that the spectacle lens was damaged. On the other hand, when a scratch test was performed by applying a polishing member made of gypsum having a Mohs hardness of 2 to the surface of the spectacle lens, it was visually observed that the spectacle lens was not damaged.
Therefore, the Mohs hardness of Comparative Example 1 is 2.5.

[Comparative Example 2]
Compared to Example 1, the hard coat layer thickness was changed to 5.0 μm. Other conditions are the same as those in Example 1.
(Mohs hardness: 2.5)
When a scratching test was performed by applying a polishing member made of calcite having a Mohs hardness of 3 to the antifouling layer on the surface of the spectacle lens, it was visually observed that the spectacle lens was damaged. On the other hand, when a scratch test was performed by applying a polishing member made of gypsum having a Mohs hardness of 2 to the surface of the spectacle lens, it was visually observed that the lens was not damaged.
Therefore, the Mohs hardness of Comparative Example 2 is 2.5.

[Comparative Example 3]
The layer configuration was changed with respect to Comparative Example 1. That is, the spectacle lens has a configuration in which a hard coat layer is provided on a lens substrate, and the antireflection layer and the antifouling layer are omitted. The material of the lens substrate and the composition of the hard coat layer are the same as in Example 1, and the layer thickness of the hard coat layer is 2.0 μm, which is the same as in Comparative Example 1.
(Mohs hardness: 2.5)
A scratch test was conducted by applying a polishing member made of calcite having a Mohs hardness of 3 to the hard coat layer on the surface of the spectacle lens, and it was visually observed that the spectacle lens was damaged. On the other hand, when a scratch test was performed by applying a polishing member made of gypsum having a Mohs hardness of 2 to the surface of the spectacle lens, it was visually observed that the lens was not damaged.
Therefore, the Mohs hardness of Comparative Example 3 is 2.5.

[Comparative Example 4]
The thickness of the hard coat layer was changed to 5.0 μm with respect to Comparative Example 3. Other conditions are the same as in Example 6.
(Mohs hardness: 2.5)
A scratch test was conducted by applying a polishing member made of calcite having a Mohs hardness of 3 to the hard coat layer on the surface of the spectacle lens, and it was visually observed that the spectacle lens was damaged. On the other hand, when a scratch test was performed by applying a polishing member made of gypsum having a Mohs hardness of 2 to the surface of the spectacle lens, it was visually observed that the lens was not damaged.
Therefore, the Mohs hardness of Comparative Example 4 is 2.5.

[Comparative Example 5]
1. Preparation of hard coat solution A hard coat solution was prepared.
First, 78 g of methanol, 100.3 g of butyl cellosolve, methanol-dispersed rutile-type titanium oxide composite sol (manufactured by JGC Catalysts & Chemicals Co., Ltd., solid content concentration 20% by weight, product names “OPTRAIQUE 1120Z” and “OPTRAIK” are registered trademarks) ) 1380.9 g and γ-glycidoxypropyltrimethoxysilane 289.9 g were mixed. To this mixed solution, 80.1 g of 0.05N hydrochloric acid aqueous solution was added dropwise with stirring, and the mixture was further stirred for 4 hours and then aged overnight. In this solution, 4.4 g of magnesium perchlorate, 0.6 g of a silicone surfactant (manufactured by Nihon Unicar Co., Ltd., product name “L-7001”), and a hindered amine light stabilizer (manufactured by Sankyo Lifetech Co., Ltd.) Product name “Sanol LS-770”, “Sanol” is a registered trademark) 2.3 g. Further, after stirring for 4 hours, the mixture was aged overnight to obtain a hard coat solution.

2. Lamination process [1] Lens base material As a lens base material, the plastic lens base material ("Seiko super sovereign (SSV)") was used like the Example.
[2] Hard coat layer A hard coat solution is applied to a lens substrate by a dipping method (pickup speed 25 cm / min), heated and cured at 80 ° C. for 30 minutes, and further heated at 120 ° C. for 180 minutes. Cured. In this way, a hard coat layer having a layer thickness of 0.5 μm and a refractive index of 1.67 was formed on the lens substrate.
[3] Antifogging layer 5 g of sodium polyoxyethylene lauryl ether sulfate (manufactured by Nikko Chemicals Co., Ltd., product name “Nikkor SBL-4N”) was dissolved in 95 g of water to obtain an antifogging agent.
One drop (about 0.02 g) of an antifogging agent was dropped onto the lens on which the hard coat layer was formed, and spread with tissue paper, and at the same time, extra components adhered were wiped off.
In addition, the comparative example 5 reproduces the structure approximated to patent document 1 using the component of the hard layer (hard coat layer) and anti-fog layer (antifouling layer) which were shown by patent document 1. FIG. The ratio of Ti and Zr constituting the hard layer is 89:11, and the ratio of Si and Ti + Zr is 71:29, which is within the range shown in Patent Document 1.

The scratch test conditions are the same as in the examples and other comparative examples.
(Mohs hardness: 2.5)
A scratching test was conducted by applying a polishing member made of calcite having a Mohs hardness of 3 to the antifogging layer on the surface of the spectacle lens, and it was visually observed that the spectacle lens was damaged. On the other hand, when a scratch test was conducted by applying a polishing member made of gypsum having a Mohs hardness of 2 to the lens surface, it was visually observed that the spectacle lens was not damaged.
Therefore, the Mohs hardness of Comparative Example 5 is 2.5.

[Reference example]
Among the products on the market, as examples of products having good scratch resistance, the thickness and Mohs of the hard coat layer of Nikon Lite 4AS SEECEARAR 167 / AS / UV (manufactured by Nikon Essilor, “SEECEAR” is a registered trademark) Hardness was measured. As a result, the commercially available product had a layer thickness of 1.9 μm, which was close to the layer thickness of the hard coat layer of Comparative Example 1, and its Mohs hardness was 2.5, the same as Comparative Examples 1 to 4.
The results of the above Examples, Comparative Examples and Reference Examples are summarized in Table 1.

  As shown in Table 1, the lens base 10, the hard coat layer 12 having a layer thickness of 6.5 μm or more and 40 μm or less provided on the lens base 10 directly or via another layer, and the hard coat layer 12 In Examples 1 to 5 including the antireflection layer 13 provided and the antifouling layer 14 provided on the antireflection layer 13, the hard coat layer has a layer thickness of 2 μm or more and 5 μm or less with the same layer configuration. Comparing certain Comparative Examples 1 and 2, the eyeglass lenses 1 of Examples 1 to 5 have a Mohs hardness of 3 compared to Comparative Examples 1 and 2 that are scratched when a scratch test is performed with a polishing member having a Mohs hardness of 3. This polishing member is not scratched. That is, by setting the layer thickness to 6.5 μm or more, the spectacle lens 1 having better scratch resistance than before can be realized. Comparative Example 5 is similar to the eyeglass lens disclosed in Patent Document 1, but in Comparative Example 5, the Mohs hardness was comparable to Comparative Examples 1 and 2. Therefore, it can be said that the spectacle lenses 1 of Examples 1 to 5 have better scratch resistance than Comparative Example 5. Furthermore, since the Mohs hardness of the reference example was 2.5, it can be said that the Mohs hardness of the conventional spectacle lens is large and about 2.5. Therefore, by setting the Mohs hardness to 3 or more, it is possible to realize a spectacle lens having higher scratch resistance than conventional ones.

  Similar layers as in Examples 6 to 9 including the lens substrate 10 and the hard coat layer 22 having a layer thickness of 6.5 μm or more and 40 μm or less provided on the lens substrate 10 directly or via another layer. In comparison with Comparative Examples 3 and 4 where the hard coat layer thickness is 2 μm or more and 5 μm or less in the configuration, Comparative Example 3 and 4 are damaged when the scratch test is performed with a polishing member having a Mohs hardness of 3. On the other hand, Examples 6 to 9 are not damaged. That is, by setting the layer thickness to 6.5 μm or more, the spectacle lens has good scratch resistance even when there is no antireflection layer and antifouling layer.

  In Examples 3 to 5 in which the hard coat layer 12 has a thickness of 10 μm or more, the Mohs hardness is larger than those in Examples 1 and 2 in which the hard coat layer 12 has a thickness of less than 10 μm. Similarly, Examples 7 to 9 in which the hard coat layer 12 has a thickness of 10 μm or more have a Mohs hardness larger than that of Example 6 in which the hard coat layer 22 has a thickness of less than 10 μm. Therefore, the layer thickness of the hard coat layer 12 is more preferably 10 μm or more.

  In Examples 1 to 5, the Mohs hardness increases as the layer thickness of the hard coat layer 12 increases. Similarly, in Examples 6 to 9, the Mohs hardness increases as the layer thickness of the hard coat layer 22 increases. As can be seen, the Mohs hardness can be easily adjusted by adjusting the thickness of the hard coat layer. Further, since the Mohs hardness of Example 5 corresponding to the upper limit (40 μm) of the thickness of the hard coat layer that can be formed using the hard coat solution is 4.5, the surface of the spectacle lens 1 is the antifouling layer 14. In this case, the Mohs hardness of the spectacle lens 1 is 4.5 or less (less than 5). Similarly, since the Mohs hardness of Example 9 is 5.5, the Mohs hardness of the spectacle lens 2 when the surface of the spectacle lens 2 is the hard coat layer 22 is 5.5 or less (less than 6).

  In addition, this invention is not limited to embodiment mentioned above, The deformation | transformation in the range which can achieve the objective of this invention is also included.

  DESCRIPTION OF SYMBOLS 1, 2 ... Eyeglass lens, 10 ... Lens base material, 11 ... Primer layer, 12, 22 ... Hard-coat layer, 13 ... Antireflection layer, 14 ... Antifouling layer, P ... Polishing member

Claims (7)

Eyeglass lenses,
A lens substrate;
A hard coat layer provided directly or via another layer on the lens substrate;
An antireflection layer provided on the hard coat layer;
An antifouling layer provided on the antireflection layer,
The Mohs of the spectacle lens when the surface of the antifouling layer is rubbed for 1 to 5 reciprocations with a load of 500 gf with a contact area of 1.0 mm × 1.0 mm using a polishing member used for Mohs hardness evaluation The hardness is 3 or more and less than 5,
Eyeglass lens. The spectacle lens according to claim 1,
The Mohs hardness is 4 or more and less than 5,
Eyeglass lens. Eyeglass lenses,
A lens substrate;
A hard coat layer provided directly or via another layer on the lens substrate,
The Mohs of the spectacle lens when the surface of the hard coat layer is rubbed for 1 to 5 reciprocations with a load of 500 gf with a contact area of 1.0 mm × 1.0 mm using a polishing member used for Mohs hardness evaluation The hardness is 3 or more and less than 6.
Eyeglass lens. The spectacle lens according to claim 3,
The Mohs hardness is 5 or more and less than 6.
Eyeglass lens. Eyeglass lenses,
A lens substrate;
A hard coat layer provided directly or via another layer on the lens substrate;
An antireflection layer provided on the hard coat layer;
An antifouling layer provided on the antireflection layer,
When the surface of the antifouling layer is rubbed for 1 to 5 reciprocations with a load of 500 gf with a contact area of 1.0 mm × 1.0 mm using a polishing member having a Mohs hardness of 3 to less than 5, the spectacle lens Is not scratched,
Eyeglass lens. The spectacle lens according to any one of claims 1, 3, and 5,
The hard coat layer has a thickness of 6 μm or more and 40 μm or less.
Eyeglass lens. The spectacle lens according to any one of claims 1 to 6,
The hard coat layer has a layer thickness of 10 μm or more and 40 μm or less.
Eyeglass lens.

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