Antifogging agent for lens

Abstract

To provide an antifogging agent for lens that can form a coating that easily maintains antifogging performance for a long period of time on a substrate surface, an antifogging agent for lens using fluorine-based surfactant, and a lens cleaner in which the antifogging agent for lens is impregnated into a medium such as microfiber.SOLUTION: Provided are an antifogging agent for lens contains fluorine-based surfactant, hydrophilic polymer and / or crosslinking agent, furthermore, more preferably an antifogging agent for lens uses fluorine-based surfactant in which fluorine-containing group in the fluorine-based surfactant is perfluoropolyether group, and a lens cleaner in which the antifogging agent for lens is impregnated into microfiber, nonwoven fabric, woven fabric, sponge, cotton or paper.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to an anti-fogging agent for hard surfaces such as glass or plastic. Specifically, it relates to an anti-fogging agent for lenses that is likely to exhibit anti-fogging performance over a long period. More preferably, (1) itself and its decomposition products may remain in the environment longer than other artificial chemicals, and (2) it does not use a fluorosurfactant containing a perfluoroalkyl group for which there are concerns about bioaccumulation, mobility, the possibility of long-distance transport, and biotoxicity (such as a decrease in immunity, low birth weight infants, an increase in cholesterol levels, kidney cancer, prostate cancer, etc.). The present invention relates to an anti-fogging agent with low environmental impact and friendly to living organisms.

Background Art

[0002] When wearing glasses or sunglasses, when the outside temperature is low in winter, when entering a warm room, or when using a mask, etc., there is a problem that glasses lenses, sunglasses lenses, etc. become fogged by the moisture contained in the exhaled breath, making it difficult to see ahead.

[0003] As materials that can impart anti-fogging performance to glasses lenses, etc., there are, for example, the fluorosurfactants described in Patent Document 1 and Patent Document 2. However, in these patent documents, only the fluorosurfactant is applied as an anti-fogging agent. In these documents, by mixing a plurality of fluorosurfactants with different polarities, the manifestation of anti-fogging performance and the extension of its persistence are attempted. However, since the fluorosurfactant itself does not have film-forming properties, it is difficult to manifest anti-fogging performance. Also, as described in Non-Patent Document 1, the influence of the perfluoroalkyl group, which is the raw material of the fluorosurfactant that is the raw material of the conventional anti-fogging agent for glasses, on the human body and the environment has attracted attention, and an anti-fogging agent derived from a perfluoroalkyl group-free fluorosurfactant described in Patent Document 3 is also demanded. However, there is a problem that it is difficult to manifest anti-fogging performance even when applying the perfluoroalkyl group-free fluorosurfactant itself.

Prior Art Documents

Patent Documents

[0004] [Patent Document 1] Japanese Patent No. 6371654 [Patent Document 2] Japanese Patent No. 6483981 [Patent Document 3] Japanese Unexamined Patent Application Publication No. 2022-191185 [Non-Patent Document]

[0005] [Non-Patent Document 1] Regulatory Proposal for the Persistent Chemical Substance "PFAS" in Europe, Mizuho Research & Technologies 2023 [Summary of the Invention] [Problems to be Solved by the Invention]

[0006] The present invention has been made in view of the above prior art, and provides an anti-fogging agent for lenses containing a fluorosurfactant, a polymer, and / or a crosslinking agent, which can easily form a film on the surface of a substrate and maintain the anti-fogging performance for a long time. Furthermore, preferably, the anti-fogging agent for lenses uses a fluorosurfactant in which the fluorine-containing group in the fluorosurfactant is a perfluoropolyether group, and provides a glasses cleaner in which these anti-fogging agents for lenses are impregnated in a medium such as microfibers. [Means for Solving the Problems]

[0007] As a result of earnestly examining while paying attention to the problems of the prior art as described above, the present inventors have found that an anti-fogging agent for lenses containing a fluorosurfactant, a hydrophilic polymer that imparts film-forming properties and durability of the film, and / or a crosslinking agent can solve the above problems, and have arrived at the present invention.

[0008] That is, the present invention is characterized by the following constitution and solves the above problems. [1] An anti-fogging agent for lenses containing a fluorosurfactant, a hydrophilic polymer, and / or a crosslinking agent. [2] The anti-fogging agent for lenses according to [1], wherein the fluorine-containing group in the fluorosurfactant is a perfluoropolyether group. [3] The anti-fogging agent for lenses according to [1] to [2], further comprising a non-fluorosurfactant. [4] A glasses cleaner obtained by impregnating the anti-fogging agent for lenses according to [1] or [2] into microfibers, nonwoven fabric, woven fabric, sponge, cotton, or paper. [5] A glasses cleaner obtained by impregnating the anti-fogging agent for lenses according to [3] into microfibers, nonwoven fabric, woven fabric, sponge, cotton, or paper. [Effect of the Invention]

[0009] According to the present invention, by including a hydrophilic polymer, the hydrophilicity and film-forming property derived from the hydrophilic polymer are exerted, so that a uniform anti-fogging film is easily formed, the anti-fogging performance is improved, and the duration of the anti-fogging performance is extended. Further, by including a cross-linking agent, the water resistance of the anti-fogging film is improved, and as a result, an anti-fogging agent with improved durability of the anti-fogging film and a long duration of the anti-fogging performance can be provided. Further, preferably, by using a fluorosurfactant in which the fluorine-containing group in the fluorosurfactant is a perfluoropolyether group, it is possible to provide an anti-fogging agent that is friendly to the environment and living organisms in addition to the above-described characteristics. [Embodiments for Carrying Out the Invention]

[0010] The anti-fogging agent for lenses of the present invention contains a fluorosurfactant, a hydrophilic polymer, and / or a cross-linking agent. As the fluorosurfactant, preferably, a fluorosurfactant containing a perfluoroalkyl group as the fluorine-containing group in the fluorosurfactant and a surfactant in which the fluorine-containing group in the fluorosurfactant is a perfluoropolyether group are mentioned. Each fluorosurfactant can be classified into a fluorine-based anionic surfactant, a fluorine-based cationic surfactant, a fluorine-based nonionic surfactant, a fluorine-based amphoteric surfactant, and the like. In the present invention, an example of the perfluoropolyether group is a group represented by the following formula (A). C m F 2m+1 O(CF 2 O) n CF 2 - (A) In the formula, m is an integer from 1 to 3, and n is an integer from 2 to 10.

[0011] The fluorine-based anionic surfactant is an anionic surfactant in which the hydrogen atoms in the alkyl chain in the surfactant are replaced by fluorine atoms. For example, the general formula (1) R f -X-Y a (1) (In the formula, R f represents a fluoroalkyl group, a fluoroalkyl ether group, or a fluoroalkenyl group, X is an alkylene group or an arylene group, and may have a sulfoamide group, a carbonyl group, or an oxa group. Y a represents an anionic group.) Compounds represented by the formula are exemplified.

[0012] R f The number of carbon atoms of the fluoroalkyl group, fluoroalkyl ether group, or fluoroalkenyl group represented by is not particularly limited, but is preferably 3 to 20, and may be any of a linear, branched, or cyclic structure. However, a linear structure is preferred because it is easily available. The substitution number of fluorine in the fluoroalkyl group, fluoroalkyl ether group, or fluoroalkenyl group is also not particularly limited, and may be a perfluoroalkyl group, perfluoroalkyl ether group, or perfluoroalkenyl group in which all hydrogen atoms are replaced by fluorine, or any other fluoroalkyl group.

[0013] Y a The anionic group represented by is not particularly limited, and examples thereof include a carboxyl group, a sulfuric acid group, a sulfonic acid group, and a phosphoric acid group.

[0014] Examples of commercially available fluorine-based anionic surfactants include S-211 and FPE-50 manufactured by AGC Seimi Chemical Co., Ltd.

[0015] Fluorine-based cationic surfactants are cationic surfactants in which the hydrogen atoms in the alkyl chain of the surfactant are replaced by fluorine atoms. For example, general formula (2) R f -X-Y b (2) (In the formula, R f , X is the same as that represented by general formula (1), and Y b represents a cationic group.) Compounds represented by the formula are exemplified.

[0016] Y b The cationic group represented by is not particularly limited, and examples include a quaternary ammonium group.

[0017] Commercially available fluorine-based cationic surfactants include S-221 manufactured by AGC Seimi Chemical Co., Ltd.

[0018] Fluorine-based nonionic surfactants are nonionic surfactants in which the hydrogen atoms in the alkyl chain of the surfactant are replaced by fluorine atoms. For example, general formula (3) R f -X-Y c (3) (In the formula, R f , X is the same as that represented by general formula (1), and Y c represents a nonionic group.) Compounds represented by the formula are exemplified.

[0019] Y c The nonionic group represented by is not particularly limited, and examples include oxyalkylene groups having 2 to 20 carbon atoms (the hydrogen atoms of the alkylene group may be replaced by fluorine atoms).

[0020] Examples of commercially available fluorine-based nonionic surfactants include S-242, S-420, S-386, S-611, S-656, S-CFJ, etc. manufactured by AGC Seimi Chemical Co., Ltd., Megafac F-251, Megafac F-430, Megafac F-444, Megafac F-477, Megafac F-552, Megafac F-555-A, Megafac F-556, Megafac F-559, Megafac F-565, Megafac R-40, etc. manufactured by DIC Corporation, and U-104, U-201, U-134, U-116, U-168, U-181, etc. manufactured by Uni-Chem Co., Ltd. Among these, U-181 manufactured by Uni-Chem Co., Ltd. is a fluorine-based surfactant in which the fluorine-containing group in the fluorine-based surfactant is a perfluoropolyether group.

[0021] The fluorine-based amphoteric surfactant is an amphoteric surfactant in which a hydrogen atom in the alkyl chain in the surfactant is replaced by a fluorine atom. For example, general formula (4) R f -X-Y d (4) (In the formula, R f , X is the same as that represented by general formula (1), and Y d represents an amphoteric ion group.) Compounds represented by this formula are exemplified.

[0022] Y d The amphoteric ion group represented by is not particularly limited, and examples thereof include a betaine group, a sulfobetaine group, and an amine oxide group.

[0023] Examples of commercially available fluorine-based amphoteric surfactants include S-231, S-232, S-233, S-241, etc. manufactured by AGC Seimi Chemical Co., Ltd.

[0024] The fluorine-based surfactant contained in the anti-fogging agent for lenses of the present invention may be an oligomer or polymer of these fluorine-based surfactants.

[0025] These fluorosurfactants may be used alone, or may be used as a mixture of the same type or different types. Also, a non-fluorosurfactant may be added.

[0026] Examples of non-fluorosurfactants include anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants.

[0027] Examples of available anionic surfactants include Emal TD, Emal 20T, Emal 20C, etc. manufactured by Kao Corporation, and Vrewrite LCA-H, Vrewrite LCA, Vrewrite SHAA, Vrewrite ESS, Sundead EN, etc. manufactured by Sanyo Chemical Industries, Ltd.

[0028] Examples of available cationic surfactants include Cotamine 24P, Cotamine 60W, Sanisol C, etc. manufactured by Kao Corporation, and Cation SF, Cation S, etc. manufactured by Sanyo Chemical Industries, Ltd.

[0029] Examples of available nonionic surfactants include Emulgen 109P, Emulgen 210P, Emulgen 320P, Emulgen 409PV, Emulgen LS-110, Emanon 1112, etc. manufactured by Kao Corporation, and Profan 2012E, Profan ME-20, Emalmin AF-101, Emalmin L, Emalmin LS, Emalmin NL, Ionet DO, Ionet DS, Ionet MO, etc. manufactured by Sanyo Chemical Industries, Ltd.

[0030] Examples of available amphoteric surfactants include Amphitol 20BS, Amphitol 88B, Amphitol 20Y-B, Amphitol 20N, etc. manufactured by Kao Corporation, and Levon LD-36, Levon MY-30W, Levon 2000L, etc. manufactured by Sanyo Chemical Industries, Ltd.

[0031] Examples of the hydrophilic polymer contained in the anti-fogging agent for lenses of the present invention include a polymer soluble in a solvent and a polymer dispersed as emulsion particles in a solvent. As the above solvent, alcohol or water is preferable because it has low toxicity and can be suitably used for the anti-fogging agent for lenses. As the above polymer, a polymer soluble in alcohol or water is preferable, and examples thereof include a cellulose-based polymer, a polyvinyl alcohol-based polymer, a polyacrylic acid-based polymer, and a polyethyleneimine-based polymer.

[0032] Among these, cellulose-based polymers, polyvinyl alcohol-based polymers, and polyethylene-based polymers are preferable.

[0033] Examples of the cellulose-based polymer include carboxymethyl cellulose, carboxymethylethyl cellulose, methyl cellulose, ethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, didroxyethylmethyl cellulose, hydroxypropylmethyl cellulose, cellulose acetate, nitrocellulose, crosscarmellose, ethylhydroxyethyl cellulose, chitin, chitosan, hyaluronic acid, porphyran, and the like.

[0034] Among these, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, hydroxyethyl cellulose, methyl cellulose, ethyl cellulose, and carboxymethyl cellulose are preferable, and hydroxypropyl cellulose, hydroxypropylmethyl cellulose, and hydroxyethyl cellulose are particularly preferable.

[0035] Examples of hydroxypropyl cellulose include HPC-SSL, HPC-SL, HPC-L, HPC-M, HPC-H, HPC-VH, etc. manufactured by Nippon Soda Co., Ltd.

[0036] Examples of carboxymethyl cellulose include those manufactured by Daicel Finechem Ltd., such as carboxymethyl cellulose 1110, 1120, 1130, 1140, 1150, 1160, 1170, 1180, 1190, 1220, 1240, 1250, 1260, 1330, 1350, 1380, 1390, 2200, 2260, 2280, etc.

[0037] Examples of hydroxyethyl cellulose include those manufactured by Daicel Finechem Ltd., such as hydroxyethyl cellulose SP200, SP400, SP500, SP600, SP850, SP900, etc.

[0038] Examples of polyvinyl alcohol include those manufactured by Kuraray Co., Ltd., such as fully saponified products (3-98, 25-100, 60-98, etc.), semi-saponified products (7-92, 27-96, etc.), partially saponified products (3-88, 95-88, 23-88E, 45-88E, 3-80, 48-80, L-8, L-9-78, L-10, etc.), low-saponified products (5-74, etc.), K polymers (6-77KL, 32-97KL, etc.), C polymers (23-88CM, etc.), R polymers (25-98R, etc.), M polymers (5-88M, 20-98M, etc.), LM polymers (LM-10HD, LM-25, etc.), SD polymers (3-86SD, etc.), KX polymers (105-88KX, 200-88KX, etc.).

[0039] The amount of the hydrophilic polymer used for the fluorosurfactant is preferably from 0.01% by mass to 100% by mass, more preferably from 0.1% by mass to 75% by mass, and particularly preferably from 0.5% by mass to 50% by mass. If the amount of the polymer is too small, the film-forming property and film strength are insufficient. If it is too large, the adhesion to the lens decreases, resulting in a decrease in the film-forming property and film strength.

[0040] The anti-fogging agent for lenses of the present invention preferably contains a crosslinking agent for crosslinking the above hydrophilic polymer or a crosslinking agent that condenses and crosslinks by itself. The hydrophilic polymer soluble in the above alcohol or water is preferably a hydrophilic polymer having active hydrogen, and examples of the crosslinking agent for gelling these include titanium compounds, zirconium compounds, silicon compounds, boric acid, and polyvalent metal salts. These crosslinking agents are preferably used together with the hydrophilic polymer. In addition, examples of the crosslinking agent that condenses and crosslinks by itself include titanium compounds, zirconium compounds, and silicon compounds.

[0041] Among these, preferred are titanium compounds, zirconium compounds, and silicon compounds as crosslinking agents for gelling the hydrophilic polymer. Titanium compounds, zirconium compounds, and silicon compounds may also be crosslinking agents that condense and crosslink by themselves.

[0042] Examples of the titanium compound and zirconium compound include Organicx TC-300, Organicx TC-310, Organicx TC-315, Organicx TC-335, Organicx TC-400, Organicx TC-510, Organicx ZC-126, Organicx TC-100, Organicx TC-401, Organicx TC-710, Organicx TC-810, Organicx TC-1040, Organicx TC-1045, Organicx ZC-700, Organicx WS-700, etc. manufactured by Matsumoto Fine Chemical Co., Ltd.

[0043] Examples of the silicon compound include KBM-303, KBM-402, KBM-403, KBE-402, KBE-403, KBE-9007N, X-12-967C, X-12-972F, X-12-1159L, etc. manufactured by Shin-Etsu Chemical Co., Ltd.

[0044] Among these, preferred crosslinking agents are Organix TC-300, Organix TC-310, Organix TC-315, Organix TC-335, Organix TC-400, Organix TC-510, Organix ZC-126, KBE-9007N, X-12-967C, X-12-972F, and X-12-1159L.

[0045] As the amount of the crosslinking agent added to the fluorosurfactant, preferably 0.01% by mass to 300% by mass is preferred, more preferably 0.1% by mass to 250% by mass, and particularly preferably 0.5% by mass to 200% by mass.

[0046] The anti-fogging agent for lenses of the present invention may further contain a solvent. Examples of the solvent include water, alcohol, etc. Examples of the alcohol include methanol, ethanol, propanol, isopropanol, butanol, t-butanol, etc. Water and alcohol may be used alone, but it is preferable to use them in combination in terms of achieving both detergency against oil stains and quick-drying properties. Water may not be contained. The concentration of the solvent preferably contained in 100% by mass of the anti-fogging agent for lenses of the present invention is preferably 5 to 99% by mass or less, more preferably 30 to 99% by mass, still more preferably 50 to 99% by mass, and particularly preferably 70 to 99% by mass.

[0047] The concentration of water preferably contained in 100% by mass of the anti-fogging agent for lenses of the present invention is not particularly limited, but is preferably 50% by mass or less, more preferably 45% by mass or less, still more preferably 40% by mass or less, and particularly preferably 35% by mass or less.

[0048] The concentration of alcohol preferably contained in 100% by mass of the anti-fogging agent for lenses of the present invention is not particularly limited, but is preferably 5 to 99% by mass or less, more preferably 30 to 99% by mass, still more preferably 50 to 99% by mass, and particularly preferably 60 to 99% by mass.

[0049] In addition, the anti-fogging agent for lenses of the present invention may contain, for example, a solvent, a chelating agent, a builder, a preservative, a pigment, a fragrance, a stabilizer, an ultraviolet absorber, an alkalizing agent, a thickener, a hydrotrope, an enzyme, an antibacterial agent, etc., as long as the effects of the present invention are not impaired.

[0050] The anti-fogging agent for lenses of the present invention is used by applying it to a hard surface. The hard surface is not particularly limited, and examples include spectacle lenses, sunglasses lenses, the screens of mobile phones, the glass surfaces of watches, the glass surfaces of televisions and personal computers, mirrors, etc. Even when applied to a hard surface that has been coated and is difficult to uniformly apply a surfactant, it can be uniformly applied, and the anti-fogging effect can be maintained for a long time.

[0051] The anti-fogging agent for lenses of the present invention can be used, for example, by a method of impregnating the anti-fogging agent for lenses of the present invention into microfibers, non-woven fabrics, woven fabrics, sponges, cotton, or paper, etc., a method of filling the anti-fogging agent for lenses into a container with a nozzle, a spray container, or a pen-type container having a liquid-absorbing core, etc., a method of spreading it with a brush, etc. In this case, the anti-fogging agent for lenses applied to the hard surface may be used by spreading it using separately dried or microfibers, non-woven fabrics, woven fabrics, sponges, cotton, or paper impregnated with the anti-fogging agent of the present invention. Among these, the method of impregnating microfibers, non-woven fabrics, woven fabrics, sponges, cotton, or paper, etc. is preferable in terms of portability, ease of wiping, and removability of dirt. In addition, the spectacle cleaner of the present invention is obtained by impregnating the anti-fogging agent for lenses of the present invention into microfibers, non-woven fabrics, woven fabrics, sponges, or paper.

[0052] The materials of the microfibers and non-woven fabrics used in the method of impregnating non-woven fabrics and the like are not particularly limited. For example, rayon, acrylic, cotton, polyethylene terephthalate, polybutylene terephthalate, polyethylene, polypropylene, nylon, etc. can be mentioned. Also, the manufacturing method of the non-woven fabric is not particularly limited, and examples include bonded binder-adhered fabric, spunbonded fabric, needle-punched fabric, spunlace fabric, spray fiber fabric, stitch-bonded fabric, etc. Note that not only microfibers and non-woven fabrics, but also those impregnated into woven fabrics, sponges, cotton, paper, etc. may be used, and the materials thereof are not particularly limited.

[0053] Examples are shown below to specifically explain the present invention. The examples are for explaining the present invention and not for limiting it.

[0054] [Example 1] 10.0 g of Surflon S221 manufactured by AGC Seimi Chemical Co., Ltd. and 5.0 g of a 0.5% ethanol solution of hydroxypropyl cellulose (HPC-H) manufactured by Nippon Soda Co., Ltd. were mixed to obtain an anti-fogging agent (A) for glasses.

[0055] [Example 2] 10.0 g of Surflon S232 manufactured by AGC Seimi Chemical Co., Ltd., 10.0 g of a 0.5% ethanol solution of hydroxypropyl cellulose (HPC-H) manufactured by Nippon Soda Co., Ltd., 20.0 g of a 1% ethanol solution of Organix TC-300 manufactured by Matsumoto Fine Chemical Co., Ltd., and 60.0 g of ethanol were mixed to obtain 100.0 g of an anti-fogging agent (B) for glasses of the present invention.

[0056] [Example 3] 10.0 g of Surflon S232 manufactured by AGC Seimi Chemical Co., Ltd., 10.0 g of a 10% ethanol solution of Organix TC-400 manufactured by Matsumoto Fine Chemical Co., Ltd., and 80.0 g of ethanol were mixed to obtain 100.0 g of an anti-fogging agent (C) for glasses of the present invention.

[0057] [Example 4] 6.0 g of U-181 manufactured by Unichema Co., Ltd. (a fluorosurfactant in which the fluorine-containing group in the fluorosurfactant is a perfluoropolyether group), 10.0 g of a 10% ethanol solution of Organix TC-400 manufactured by Matsumoto Fine Chemical Co., Ltd., and 84.0 g of ethanol were mixed to obtain 100.0 g of the anti-fogging agent (D) for glasses of the present invention.

[0058] [Example 5] 6.0 g of U-181 manufactured by Unichema Co., Ltd. (a fluorosurfactant in which the fluorine-containing group in the fluorosurfactant is a perfluoropolyether group), 50.0 g of a 10% ethanol solution of Organix TC-400 manufactured by Matsumoto Fine Chemical Co., Ltd., and 44.0 g of ethanol were mixed to obtain 100.0 g of the anti-fogging agent (E) for glasses of the present invention.

[0059] [Example 6] 6.0 g of U-181 manufactured by Unichema Co., Ltd. (a fluorosurfactant in which the fluorine-containing group in the fluorosurfactant is a perfluoropolyether group), 20.0 g of a 1% ethanol solution of Organix TC-300 manufactured by Matsumoto Fine Chemical Co., Ltd., 10.0 g of a 0.5% ethanol solution of hydroxypropyl cellulose (HPC-H) manufactured by Nippon Soda Co., Ltd., and 64.0 g of ethanol were mixed to obtain 100.0 g of the anti-fogging agent (F) for glasses of the present invention.

[0060] [Example 7] 6.0 g of U-181 manufactured by Unichema Co., Ltd. (a fluorosurfactant in which the fluorine-containing group in the fluorosurfactant is a perfluoropolyether group), 4.0 g of a 10% ethanol solution of Emalmin L-90S manufactured by Sanyo Chemical Industries, Ltd., 20.0 g of a 1% ethanol solution of Organix TC-300 manufactured by Matsumoto Fine Chemical Co., Ltd., 10.0 g of a 0.5% ethanol solution of hydroxypropyl cellulose (HPC-H) manufactured by Nippon Soda Co., Ltd., and 60.0 g of ethanol were mixed to obtain 100.0 g of the anti-fogging agent (G) for glasses of the present invention.

[0061] [Comparative Example 1] 6.0 g of U-181 (a fluorosurfactant in which the fluorine-containing group in the fluorosurfactant is a perfluoropolyether group) manufactured by Unichem Co., Ltd. and 94.0 g of ethanol were mixed to obtain 100.0 g of an anti-fogging agent (J) for glasses.

[0062] [Comparative Example 2] 10.0 g of Surflon S232 manufactured by AGC Seimi Chemical Co., Ltd. and 90.0 g of ethanol were mixed to obtain 100.0 g of an anti-fogging agent (K) for glasses.

[0063] [Evaluation of Anti-Fogging Performance by Exhalation] One or two drops of the anti-fogging agents obtained in Examples 1 to 7 and Comparative Examples 1 to 2 were dropped onto the lenses of glasses and spread evenly using a commercially available glass wipe for application. Exhalation was blown onto the coated lenses to check for the presence or absence of the manifestation of anti-fogging performance. As a result, in Examples 1 to 7, no fogging was confirmed even when exhalation was blown, and anti-fogging performance was confirmed. On the other hand, in Comparative Examples 1 to 2, fogging was confirmed when exhalation was blown, and anti-fogging performance could not be confirmed.

[0064] As is clear from the above results, it is clear that the anti-fogging agent for lenses of the present invention to which a hydrophilic polymer and / or a cross-linking agent is added is more likely to exhibit anti-fogging performance compared to the case where no hydrophilic polymer and / or cross-linking agent is added, and due to the film-forming property of the hydrophilic polymer and the improvement in durability by the cross-linking agent, the anti-fogging performance is likely to last longer. [Industrial Applicability]

[0065] The anti-fogging agent for lenses of the present invention exhibits high-durability anti-fogging performance with good uniform coatability and a long anti-fogging duration, and can be coated on lenses such as glasses and manufactured at low cost. Therefore, for example, it is useful as an anti-fogging agent for imparting anti-fogging performance to the surfaces of lenses such as spectacle lenses and sunglasses.

Claims

1. An anti-fogging agent for lenses comprising a fluorosurfactant, and a hydrophilic polymer and / or a crosslinking agent.

2. 2. The lens antifogging agent according to claim 1, wherein the fluorine-containing group in the fluorosurfactant is a perfluoropolyether group.

3. 3. The antifogging agent for lenses according to claim 1, further comprising a non-fluorine-containing surfactant.

4. 3. An eyeglass cleaner comprising microfiber, nonwoven fabric, woven fabric, sponge, cotton, or paper impregnated with the anti-fogging agent for lenses according to claim 1 or 2.

5. 4. An eyeglass cleaner comprising microfiber, nonwoven fabric, woven fabric, sponge, cotton, or paper impregnated with the anti-fogging agent for lenses according to claim 3.