JPH1017856A - Antifogging agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antifogging agent which imparts good antifogging properties to ophthalmic lenses coated with various coating materials such as one for water scorch prevention and which does not cause whitening to remain after the treatment therewith by incorporating a specific org. acid (deriv.) and a specific surfactant into the same. SOLUTION: This agent contains an alkylthiocarboxylic acid, pref. carboxymethylthiosuccinic acid and carboxyethylthiosuccinic acid, or its deriv. (e.g. an Na salt, ammonium salt, ethanolamine salt, or amide) pref. in an amt. of 1-30wt.% of the agent and a fluorocarbon surfactant (e.g. an anionic, cationic, amphoteric, or nonionic surfactant) pref. in an amt. of 0.5-20wt.% of the agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-fogging agent, and more particularly to an anti-fogging agent which can be suitably used for various optical instruments made of glass and various organic glasses, especially for spectacle lenses.

[0002] The present invention relates to an antifogging agent which can be suitably used, especially, for a plastic spectacle lens lens which has been subjected to anti-scalp processing.

[0003]

2. Description of the Related Art Conventionally, as described in JP-A-56-90876, anti-fogging agents containing a phosphate ester-based surfactant as a main active ingredient have been generally used for preventing fogging of spectacle lenses. Was.

[0004] However, even if such an antifogging agent is used, the antifogging property can hardly be imparted to the plastic spectacle lens which has been subjected to the anti-fog treatment. This is for the following reasons.

[0005] A plastic spectacle lens is usually provided with a water-repellent coating mainly composed of fluororesin for the purpose of preventing water scorching. A plastic lens provided with such a water-repellent coating is referred to as a “anti-scalp lens”. Since the surface of the anti-tank lens is made water-repellent by the water-repellent coating in this manner, raindrops, sweat, and the like are less likely to adhere to the lens surface.

[0006] Here, "water scorching" refers to a phenomenon in which some of the components contained in raindrops or sweat adhering to the surface of a spectacle lens permeate into the spectacle lens, giving the spectacle lens a dull appearance. Say. This water scorching is a phenomenon that is often seen in plastic spectacle lenses that have not been subjected to special surface treatment.

[0007] In addition, a spectacle lens is also widely provided with a dirt adhesion preventing coating.

However, spectacle lenses having various coatings, such as a water-repellent coating for the purpose of preventing water scorch, can be treated with an antifogging agent containing a phosphate ester-based surfactant as a main active ingredient. There is a problem that the antifogging agent does not adhere to the lens surface at all, and the antifogging property is hardly imparted to the spectacle lens.

Therefore, as an anti-fogging agent capable of imparting good anti-fogging properties to such spectacle lenses, an anti-fogging agent containing a fluorocarbon-based surfactant as a main active ingredient has been proposed (particularly). JP-A-5-107401 and JP-A-7-20
411).

[0010]

However, in spectacle lenses having various coatings such as anti-scalp coating, depending on the type of surface coating,
In some cases, sufficient antifogging properties could not be obtained even when treated with the above antifogging agent.

Further, when the spectacle lens is treated with the anti-fogging agent, a white film (white residue) that is opaque and has a mist is sometimes formed on the surface.

The present invention can provide a good anti-fog property to a spectacle lens coated with various coatings such as anti-scalp coating for a long time, and does not cause a white residue on the spectacle lens surface after the treatment. It is intended to provide an antifogging agent.

[0013]

Means for Solving the Problems The object of the present invention, which is intended to solve the above-mentioned problems, is to contain an alkylthiocarboxylate or a derivative thereof, and a fluorocarbon surfactant. Claim 2
In the invention described in the above, the alkylthiocarboxylic acid or a derivative thereof has a content of 1 to 30 with respect to the whole antifogging agent.
2% by weight, and the content of the fluorocarbon surfactant is 0.5 to 20% by weight based on the whole antifogging agent.

[0014]

The antifogging agent according to the present invention comprises:
Examples of the alkylthiocarboxylic acid or a derivative thereof include an alkylthiocarboxylic acid, an alkali metal salt, an ammonium salt, and an organic base salt of an alkylthiocarboxylic acid, a monoamide, a diamide, a triamide, a monoester, a diester and a triester, and an alkylthiocarboxylic acid. Examples include alkali metal salts, ammonium salts, and organic base salts of carboxylic acid monoamides and alkylthiocarboxylic acid diamides, and alkali metal salts, ammonium salts, and organic base salts of alkylthiocarboxylic acid monoesters and alkylthiocarboxylic acid diesters. .

[0015] In the present invention, the alkyl thio carboxylic acids of general formula _{HOOC-C n H 2n -S-} CH (CH 2 COOH) CO
OH (wherein n is an integer of 0 or 1 or more, preferably 0 to 4
Indicates an integer. And carboxythiosuccinic acid and carboxyalkylthiosuccinic acid, particularly carboxymethylthiosuccinic acid and carboxyethylthiosuccinic acid.

Preferred examples of the alkylthiocarboxylic acid derivative include salts such as sodium salt, potassium salt, lithium salt, ammonium salt, aliphatic amine salt, monoethanolamine salt, diethanolamine salt, and triethanolamine salt; Amides such as amides, dialkylamides and trialkylamides, esters such as monoalkyl esters, dialkyl esters and trialkyl esters, sodium salts, potassium salts, lithium salts, ammonium salts, and aliphatic salts of monoalkylamides and dialkylamides Amide salts, such as amine salts, monoethanolamine salts, diethanolamine salts, and triethanolamine salts, and sodium or potassium salts of monoalkyl or dialkyl esters;
Examples include ester salts such as lithium salts, ammonium salts, aliphatic amine salts, monoethanolamine salts, diethanolamine salts, and triethanolamine salts.

Of these compounds, particularly preferred compounds include carboxyethylthiosuccinic acid and carboxymethylthiosuccinic acid, sodium salt, potassium salt, lithium salt, ammonium salt, aliphatic amine salt, monoethanolamine salt, diethanolamine. Salts and sodium, potassium salts of triethanolamine salts, monoalkylamides, dialkylamides, trialkylamides, monoalkyl esters, dialkyl esters and trialkyl esters, monoalkyl amides, dialkyl amides, monoalkyl esters and dialkyl esters ,
Lithium salts, ammonium salts, aliphatic amine salts, monoethanolamine salts, diethanolamine salts, and triethanolamine salts.

Such compounds are available, for example, from NOF Corporation, from Nova Salt CAM, Nova Salt CS, Nova Salt CEO, Nova Salt SA-66T and Nova Acid C
It is commercially available under the trade name E.

As the fluorocarbon surfactant in the antifogging agent of the present invention, any surfactant may be used as long as it has a fluoroalkyl group as a hydrophobic group. Therefore, any of a fluorocarbon-based anionic surfactant, a fluorocarbon-based cationic surfactant, a fluorocarbon-based amphoteric surfactant, and a fluorocarbon-based nonionic surfactant is preferably used.

[0020] In the fluorocarbon surfactants, fluoroalkyl group, -C _m H _a F _b (where, m, a, and b satisfies the relation a + b = 2m + 1, m and a are 0 Or a positive integer, and b is a positive integer). Particularly preferred as a fluoroalkyl group are those wherein a is 0 and b is 2
m is a perfluoroalkyl group, and a is 1 and b is 2m.

Examples of the fluorocarbon anionic surfactant include (A) R _f -COO ^- M ⁺ , R _f O (CH ₂ CH ₂
O) _k COO ^- M ⁺ , R _f O (CH ₂ CH ₂ O) _k C _j
H _2j COO ^- M ⁺ , R _f CONHCOO ^- M ⁺ , R _f C
ONHC _j H _2j COO ^- M ⁺ , R _f CONH (CH ₂ C
H ₂ O) _k C _j H _2j COO ⁻ M ⁺ , R _f CONRCOO
^{_{- M +, R f CONRC j}} H 2j COO - M +, R f CO
NR (CH ₂ CH ₂ O) _k C _j H _2j COO ⁻ M ⁺ , R _f
SO ₂ NHCOO ⁻ M ⁺ , R _f SO ₂ NH (CH ₂ CH
^{_{2 O) k COO - M +}} , R f SO 2 NHC j H 2j COO
^{_{- M +, R f SO 2}} NRCOO - M +, R f SO 2 NR
(CH ₂ CH ₂ O) _k COO ⁻ M ⁺ , R _f SO ₂ NRC _j
H _2j COO ⁻ M ⁺ and R _f CONHCH (CH ₂ C
H ₂ COO ^- M ⁺ ) COO ^- M ⁺ (where R _f
Represents a fluoroalkyl group, R represents an alkyl group, a hydroxyalkyl group or an arylalkyl group, and k and j each represent an integer of 1 or more. M ⁺ represents a hydrogen ion, an alkali metal ion, an ammonium ion, or a monovalent organic base ion. ) One or two or more carboxylic acid salt is selected from the _{like, (B) R f SO 3} - M +, R f OC 6 H 4 SO 3 - M
^{_{+, R f CH = CHSO 3}} - M +, R f O (CH 2 CH 2
^{_{O) k SO 3 - M +}} , R f O (CH 2 CH 2 O) k C j H
^{_{2j SO 3 - M +, R}} f COOC j H 2j SO 3 - M +, M + O
^{_{- SO 2 CH (CH 2 COOR}} f ') COOR f, R f C
^{_{ONHSO 3 - M +, R f}} CONHC j H 2j SO 3 - M +,
_{R f CONH (CH 2 CH 2} O) k C j H 2j SO 3 - M +,
^{_{R f CONRSO 3 - M +,}} R f CONRC j H 2j SO 3 -
M ⁺ , R _f CONR (CH ₂ CH ₂ O) _k C _j H _2j SO
₃ ^- M ⁺ , R _f SO ₂ NHSO ₃ ^- M ⁺ , R _f SO ₂ NHC
^{_{j H 2j SO 3 - M +}} , R f SO 2 NRSO 3 - M +, and R
_f SO ₂ RC _j H _2j SO ₃ ⁻ M ⁺ (where R _f , R, k,
j and M ⁺ have the same meanings as those in the general formula representing the carboxylate, and R _f ′ represents the same or different fluoroalkyl group as the fluoroalkyl group R _f . )
One or two or more sulfonates selected from the group consisting of: (C) R _{f
^{OSO 3 - M +, R f}} R f 'CHOSO 3 - M +, R f (OC
_{H 2 CH 2) k OSO 3} - M +, R f COOCH 2 CH (O
^{_{H) CH 2 SO 3 - M}} +, R f CONRC j H 2j OSO 3 -
M ⁺ and R _f CONHC _j H _2j OSO ₃ ^- M ⁺ (however,
R _f , R _f ′, R, k, j, and M ⁺ have the same meanings as those in the general formula representing the carboxylate. ), One or more sulfates selected from the group consisting of (D) and R _f OPO (O ⁻ M ⁺ ) ₂ , (R _f
O) ₂ POO ^- M ⁺ , (R _f SO ₂ NHCH ₂ CH ₂
O) ₂ POO ^- M ⁺ and (R _f SO ₂ NRCH ₂ CH ₂
O) ₂ POO ⁻ M ⁺ (provided that R _f , R _f ′, and M ⁺ have the same meanings as those in the general formula representing the carboxylate), or one or more selected from the group And the like.

Examples of the fluorocarbon cationic surfactant include (a) R _f NH ₂ ⁺ X ⁻ , R _f R _f ′ NH ⁺ X ⁻ , R _{f
^{R f 'R f "N +}} X -, R f CONHC j H 2j NH 2 + X -,
^{_{R f CONHC j H 2j N +}} R f 'HX -, R f CONHC
^{_{j H 2j N + R f '}} R f "X -, R f CONRC j H 2j NH 2 +
^{_{X -, R f CONRC j H}} 2j N + R f 'X -, and R _f C
^{_{ONRC j H 2j N + R f}} 'R f X - (R f, R f', and R _f "
Represents the same or different fluoroalkyl groups, R represents an alkyl group, a hydroxyalkyl group or an arylalkyl group, X represents a halogen atom, and j has the same meaning as described above. One or two or more amine salt selected _{from), (b) R f R} 3 N + X -, R f R f 'R 2 N + X
^-, and _{R f R f 'R f "} RN + X - (R f, R f', R f",
R and X have the same meaning as in the general formula representing the amine salt. ) One or more quaternary ammonium salts selected from the group consisting of (c) a fluoroalkylpyridinium salt,

[0023]

Embedded image

And di (fluoroalkyl) morpholinium salts

[0025]

Embedded image

(R _f , R _f ′, and X have the same meanings as those in the above general formula representing the amine salt.) One or more cyclic quaternary ammonium salts selected from the group consisting of: Can be used.

Examples of the fluorocarbon amphoteric surfactant include:
(A) R _f NHC _j H _2j COOH, R _f NH (CH ₂ O
CH ₂ O) _k COOH, R _f N (CH ₂ COOH) ₂ , R
_{f CONHC p H 2p NHC j H} 2j COOH, R f CON
_{RC p H 2p NH (CH 2} OCH 2 O) k COOH, R f C
ONH (CH ₂ CH ₂ ) _q NHC _j H _2j COOH, R _f C
ONR (CH ₂ OCH ₂ O) _q NHC _j H _2j COOH,
R _f CONR (CH ₂ OCH ₂ O) _q NH (CH ₂ OC
_{H 2 O) k COOH, R} f RR 'N + C j H 2j COO
^{_{-, R f R f 'N}} + C j H 2j COO -, and R _f RN ⁺ (CH
_{2 OCH 2 O) k C j} H 2j COO - the (R _f and R _f 'are the same or different fluoroalkyl groups, R represents an alkyl group, a hydroxyalkyl group or an arylalkyl group,
j, k, p, and q are positive integers. (B) R _f NHC _j H _2j O
SO ₃ or R _f CONHC _j H _2j C _p H _2p OSO ₃ (R
_f , R, j, and p have the same meanings as those in the general formula representing the carboxylic acid type amphoteric surfactant. )
Sulfate ester type amphoteric surfactants represented by, and (c)
R _f NHC _j H _2j SO ₃ H, R _f CONHC _j H _2j NH
C _p H _2p SO ₃ H, or _{R f OOC (R f 'OOCCH} 2)
The sulfone type represented by NHC _j H _2j SO ₃ H (R _f , R _f ′, R, j, and p have the same meaning in the general formula representing the carboxylic acid type amphoteric surfactant) An amphoteric surfactant is used.

Examples of the fluorocarbon nonionic surfactant include R _f O (CH ₂ CH ₂ O) _k H and R _f O (CH
Ether-type nonionic surfactants such as ₂ CH ₂ O) _k (CH ₂ CH ₂ O) _{k ′} H, R _f COO (CH ₂ CH ₂ O) _k
H, R _f COO (CH ₂ CH ₂ O) _k (CH ₂ CH ₂
O) _{k ′} H, R _f SO ₂ (CH ₂ CH ₂ O) _k H and R _f
Ester-type nonionic surfactants such as SO ₂ (CH ₂ CH ₂ O) _k (CH ₂ CH ₂ O) _{k ′} H, and R _f CON
H (CH ₂ CH ₂ O) _k H, R _f SO ₂ NH (CH ₂ C
H ₂ O) _k H, R _f CONR (CH ₂ CH ₂ O) _k H,
And _{R f SO 2 NR (CH 2} CH 2 O) k nitrogen-containing type nonionic surface active agents such as H are used. In the above formulas, R _f and k have the same meanings as in the general formula representing the carboxylic acid-type amphoteric surfactant, and k ′ represents a positive integer.

Among these fluorocarbon surfactants, particularly preferred are R _f COOM (M: Na,
K, Li, and NH ₄ ), R _f SO ₃ M (M: Na,
K, Li, and NH ₄ ), R _f SO ₃ NRCH ₂ COO
M (M: Na, K, Li, and NH ₄ ), R _f SO ₃ N
R (CH ₂ OCH ₂ O) _n H (n = 1 to 20), R _f C
OO (CH ₂ CH ₂ O) _P (CH ₂ CH ₂ O) _q H
(P: 1~10, q: 1~10 ), (R f O) 2 POO -
M ⁺ (M: Na, K, Li, and NH ₄ ), and (R _f
SO ₂ NHCH ₂ CH ₂ O) ₂ POO ^- M ⁺ (M: H, N
H ₄ ). The fluorocarbon surfactants represented by the above structural formulas are commercially available, for example, as F-top series from Mitsubishi Materials Corporation and as Unidyne series from Daikin Industries, Ltd. Others are commercially available from Dainippon Ink and Chemicals, Inc. as the Megafactor series and from Nihon Yushi Co., Ltd. as the Unisafe H series.

These fluorocarbon surfactants may be used alone or in combination of two or more.

In the antifogging agent of the present invention, the alkylthiocarboxylic acid or its derivative and the fluorocarbon surfactant can be dissolved in one or more solvents selected from water and a water-soluble organic solvent. it can. As the solvent,
Either water or a water-soluble organic solvent may be used, or a mixture of both may be used.

As the water, any type such as ion-exchanged water and medicated distilled water can be used.

As the water-soluble organic solvent, alcohols,
Ketones, polyhydric alcohols, cellosolves, carbitols and the like can be mentioned.

Specifically, examples of the alcohols include methyl alcohol, ethyl alcohol, isopropyl alcohol, and n-propyl alcohol.

Examples of ketones include acetone and methyl ethyl ketone.

The polyhydric alcohols include ethylene glycol, polyethylene glycol, propylene glycol, 1,3-propanediol, 1,3-butylene glycol, 1,4-butanediol, 2,3-butanediol, 1,5 -Pentanediol, hexylene glycol, glycerin and the like.

The cellosolves include methyl cellosolve and ethyl cellosolve, and the carbitols include methyl carbitol and ethyl carbitol.

The antifogging agent of the present invention can contain an antifungal agent, an antibacterial agent, and a preservative in addition to the alkylthiocarboxylate or a derivative thereof and a fluorocarbon surfactant. When the above-mentioned water-soluble organic solvent alone or a mixed solvent of these water-soluble organic solvents and water is used as a solvent, it is preferable to blend a fragrance to mask the specific odor of these water-soluble organic solvents. In addition to this,
A bittering agent may be added to prevent accidental ingestion by infants and the like.

The antifogging agent of the present invention may contain a surfactant other than the above-mentioned fluorocarbon surfactant. Examples of such surfactants include natural surfactants such as savonin and lecithin, sodium alkylbenzene sulfonate, sodium alkane sulfonate, sodium α-olefin sulfonate, sodium alkyl sulfate, sodium alkyl (polyoxyethylene) sulfate, and N- Anionic surfactants such as sodium acylamino acid, cationic surfactants such as dialkyldimethylammonium chloride, monoalkyltrimethylammonium chloride, trialkylmonomethylammonium chloride, and tetraalkylammonium chloride, linear alkyl polyoxyethylene ether, S -Alkyl polyoxyethylene ether, alkylphenyl polyoxyethylene ether, alkylphenyl polyoxyethylene ether,
Examples include nonionic surfactants such as N, N-di (alkanol) alkaneamide and amine oxide, and amphoteric surfactants such as sulfobetaine.

In the antifogging agent of the present invention, the content of the alkylthiocarboxylic acid or a derivative thereof is usually 1 to 30% by weight, preferably 5 to 30% by weight, particularly preferably 5 to 30% by weight.
15% by weight. Here, the content ratio refers to the total amount of all components contained in the antifogging agent, such as an alkylthiocarboxylic acid or a derivative thereof, a fluorocarbon surfactant, an antifungal agent, an antibacterial agent, a preservative, and a solvent. , The ratio of a certain component. When the content ratio of the alkylthiocarboxylic acid or a derivative thereof is within the above range, an anti-water coating,
Even in spectacle lenses with various coatings, greater anti-fog properties are obtained depending on the type of surface coating, and the generation of white residue is effectively prevented.

The content of the fluorocarbon surfactant is usually 0.5 to 20% by weight, preferably 1 to 15% by weight, particularly preferably 3 to 10% by weight. When the content of the fluorocarbon-based surfactant is within the above range, even a spectacle lens having various coatings such as anti-scalding coating can be uniformly and easily applied to the lens surface, and additionally, it can be prevented. The effect of maintaining the fogging effect can be further enhanced. However, in order to obtain such an effect, it is sufficient that the content of the fluorocarbon surfactant is as high as 20% by weight.

Surfactants other than alkylthiocarboxylic acids and derivatives thereof, and other than fluorocarbon surfactants;
For example, when a natural surfactant, an anionic surfactant, a cationic surfactant, or a nonionic surfactant is blended in the anti-fogging agent of the present invention, the above-mentioned fluorocarbon surfactant and these are used. It is desirable that the total content of the surfactant and the surfactant does not exceed the content of the alkylthiocarboxylic acid or its derivative. If the content exceeds the above range, not only the anti-fogging effect but also glare and white residue increase on the lens surface, and the visibility may be impaired.

As a method for treating, for example, an eyeglass lens with the antifogging agent of the present invention, for example, there is a method in which the above antifogging agent is put into washing water in an ultrasonic cleaning tank, and the eyeglass lens is immersed therein. Alternatively, there is a method of impregnating tissue paper, gauze, a soft nonwoven fabric, or the like with the above antifogging agent, and wiping the spectacle lens with the use of these materials.
Further, instead of directly applying the anti-fogging agent to the spectacle lens using a tissue paper, a gauze, or a non-woven fabric, the anti-fogging agent may be directly sprayed on the spectacle lens.

The antifogging agent of the present invention can be in various product forms.

The antifogging agent of the present invention may be filled in a glass, plastic or metal container. Such a product form is, for example, an ultrasonic cleaning of an eyeglass lens by putting an antifogging agent into cleaning water in an ultrasonic cleaning tank, and impregnating a tissue paper, a gauze, or a nonwoven fabric with an antifogging agent to form an eyeglass lens. It is suitable when wiping and applying an antifogging agent.

In addition, a product form in which the antifogging agent of the present invention is impregnated in tissue paper, gauze, nonwoven fabric, or the like is also preferable.

The antifogging agent of the present invention can be in the form of an aerosol product. To make the anti-fog agent of the present invention an aerosol product, ethane, LPG, propane, butane,
And low-boiling halogenated hydrocarbons such as methyl chloride, methylene chloride and ethyl chloride; and perfluoromethane, dichlorodifluoromethane, trichlorofluoromethane, 1,2-dichloro-
1,1,2,2-tetrafluoroethane, 1,1,2-
Trichloro-1,2,2-trifluoroethane, 1,
What is necessary is just to seal a propellant selected from fluorocarbons such as 1,2,2, -tetrachloro-1,2-difluoroethane and perfluoroethane and the antifogging agent of the present invention in a spray container.

In the above aerosol product, the ratio between the antifogging agent and the propellant is as follows: antifogging agent: propellant = 95/5 to 60/4.
0 (parts by weight / parts by weight), especially 90/10 to 80/20
(Parts by weight / parts by weight) is preferred.

Of the propellants listed above, low-boiling hydrocarbons, low-boiling halogenated hydrocarbons, chlorofluorocarbons, and inert gases can all be enclosed in one spray container together with the antifogging agent. As the spray container, a spray container made of various synthetic resins can be used in addition to a metal spray container. When the spray button is pressed in such a spray container, the antifogging agent is jetted out of an injection nozzle attached to the head of the spray container due to the pressure of the propellant.

Further, the antifogging agent and the propellant may be filled in an airtight inner bag, and the inner bag may be sealed in a spray container together with the propellant. However, this inner bag is connected to a spray nozzle attached to the head of the spray container.
The propellant filled in the inner bag and the propellant sealed between the spray container and the inner bag may be the same propellant or different propellants. When the spray nozzle is pressed in this spray container, the antifogging agent filled in the inner bag is ejected from the spray nozzle by the pressure of the propellant sealed between the inner bag and the spray container.

As the aerosol product, in addition to the form in which the propellant and the antifogging agent of the present invention are filled in a spray container, a product in which the antifogging agent of the present invention is filled in a pump type spray container is also preferable.

[0052]

Hereinafter, the present invention will be described specifically with reference to examples.

Examples 1 to 6 Antifoggants were prepared according to the compositions shown in Table 1. These antifogging agents were compounded with carboxyethylthiosuccinate (trade name: Nova Salt SA-66T (manufactured by NOF CORPORATION)) as an alkylthiocarboxylic acid derivative, and further compounded with a fluorocarbon surfactant. .

A commercially available tissue paper was impregnated with an appropriate amount of the prepared anti-fogging agent.
-L-8 was wiped off, and an antifogging agent was applied to the surface of the sample lens.

[0055]

[Table 1]

[0056]

[Table 2]

An antifogging agent is applied to the surface of the sample lens,
Hold for 0 seconds to 3 minutes. After that, wipe the sample lens surface with another dry tissue paper,
Each item of workability and visibility was evaluated. Anti-fog,
The evaluation method for each item of workability and visibility is shown below. Tables 3 and 4 show the evaluation results.

(Anti-fogging property) Test method for anti-fog for glasses (J
IS-S-4030). An antifogging agent was applied to the sample lens surface, and water vapor was applied for 3 minutes each time, and the evaluation was made based on the number of repetitions until clouding or dew formation of 10% or more in terms of area occurred on the sample lens surface. When the number of repetitions was 3 or more, the antifogging property was maintained as ○, when the number of repetitions that could maintain the antifogging property was 1 to 2 times, and when the number was 1 or less, ×. .

(Workability) After applying the antifog agent to the sample lens,
When wiping the surface of the sample lens with another dry tissue paper, if the antifogging agent applied to the surface of the sample lens can be lightly and easily wiped off, ○, if gently wiped, easily wipe off The case where there was no sample was rated as “△”, and the case where the product was not wiped off even when strongly wiped was marked as “×”.

(Visibility) The surface of the sample lens from which the applied anti-fogging agent was wiped off was visually observed, and the presence or absence of white residue or glare was examined. No white residue or glare is seen on the surface of the sample lens, and the color of the anti-reflection film applied to the surface of the sample lens (which can be confirmed as a green or red-purple film when reflecting light from a fluorescent lamp) is changed. Was not seen, ○, a white residue or glare was slightly seen on the surface of the sample lens, or Δ when the color of the antireflection film applied to the surface of the sample lens was slightly changed, and The case where white residue or glare was clearly recognized or the color of the antireflection film was clearly changed was evaluated as x.

[0061]

[Table 3]

[0062]

[Table 4]

As is clear from Tables 3 and 4, the antifogging agents according to Examples 1 to 6 have good workability and clear vision for any of the test lenses L-1 to L-8. Showed sex.
In addition, even when water vapor was applied to the sample lens for 3 minutes, the anti-fogging property was maintained for at least one or two repetitions. In particular, the antifogging agents of Examples 3 to 5 in which the amount of carboxyethylthiosuccinate (Novasolt SA-66T (trade name)) was increased to 10% by weight, and Novasolt SA-
Example 6 in which the amount of 66T (trade name) was increased to 15% by weight
The antifogging agent of No. 3 showed a high antifogging property with a repetition number of 3 or more.

Comparative Examples 1 to 6 Antifoggants were prepared according to the compositions shown in Table 5. These antifogging agents did not contain any of alkylthiocarboxylic acids and derivatives thereof. However, the antifogging agents of Comparative Examples 2 to 5 contained a fluorocarbon surfactant.

An appropriate amount of the prepared anti-fogging agent was impregnated in a commercially available tissue paper, and the sample lens shown in Table 2 was wiped with this, and the surface of the sample lens was coated with the anti-fogging agent.

[0066]

[Table 5]

An antifogging agent was applied to the surface of the sample lens,
Seconds to three minutes have elapsed. Thereafter, the surface of the sample lens was wiped with another dry tissue paper, and each item of antifogging property, workability, and visibility was evaluated in the same manner as in Examples 1 to 6. Tables 6 and 7 show the evaluation results.

[0068]

[Table 6]

[0069]

[Table 7]

As is clear from Tables 6 and 7, L-
When the anti-fogging agents of Comparative Examples 1 to 6 were applied to the test lenses 1 to L-8, wiping was difficult, white residue or glare was observed depending on the test lenses. In addition, when water vapor is applied to the sample lens for 3 minutes, there is also a sample lens that loses the anti-fog property after one repetition. In particular, Comparative Examples 1 and 5 containing only ordinary surfactants
In the anti-fogging agents of Nos. 6 and 6, the anti-fogging property was lost only by applying water vapor to the sample lens once, and white residue, glare, and / or discoloration of the antireflection film were clearly observed.

As is evident from these results, even with spectacle lenses having various coatings such as anti-scalp coatings, good antifogging properties can be obtained by applying the antifogging agent of the present invention. Granted for a long time. Also, no white residue is generated on the surface of the spectacle lens.

Claims (2)

[Claims] 1. An anti-fogging agent comprising an alkylthiocarboxylic acid or a derivative thereof, and a fluorocarbon surfactant. 2. The content of the alkylthiocarboxylic acid or a derivative thereof is 1 to 30% by weight based on the whole antifogging agent.
The antifogging agent according to claim 1, wherein the content of the fluorocarbon surfactant is 0.5 to 20% by weight based on the whole antifogging agent.