WO2017199158A1 - Anti-fog formulation - Google Patents

Abstract

The present invention concerns a cosmetic anti-fog formulation for eyeglasses, swim goggles, snorkeling and scuba diving masks, and ski goggles, said formulation comprising a mixture of ionic, non-ionic and amphoteric surfactants and hyaluronic acid or a salt thereof. The formulation is an aqueous solution for sprayed application.

Description

"ANTI-FOG FORMULATION"

DESCRIPTION

TECHNICAL FIELD OF THE INVENTION

The object of the present invention is a cosmetic formulation, preferably in a spray form, and the use thereof to prevent fogging of eyeglasses, swim goggles, snorkeling and scuba diving masks and ski goggles.

STATE OF THE ART

The fogging of devices for aiding vision is a problem of deep concern especially during the performance of sports activities such as swimming, snorkeling, scuba diving and skiing.

The fogging of swim goggles, snorkeling and scuba diving masks and ski goggles is due to the difference in temperature between the inner lenses, which are in contact with the person's body, and the outer lenses, which are in contact with the water or the atmosphere.

The water droplets present in one's breath tend to condense on the inner lenses, which are warmer, thus leading to the formation of an opaque patina that is quite troublesome for swimmers and for skiers who are forced to interrupt their workout continuously to regain correct external vision.

To overcome this drawback, essentially two solutions have been devised: 1 ) the use of anti-fog sprays that are sprayed inside the goggles or mask before beginning a sports activity; 2) the use of goggles/masks equipped with a layer of anti-fog plastic.

Several types of anti-fog sprays are available on the market, but they all share the same drawback: they work very well soon after application, but tend to lose their effectiveness shortly after beginning a workout.

Goggles and masks equipped with an anti-fog layer are very effective; however, they have the drawback of not lasting very long, with the result that the anti-fog layer needs to be repaired or an anti-fog spray must be used.

The aim of the present invention is to overcome the drawbacks affecting the swimming and skiing fields by providing an anti-fog formulation that has proved to be far more effective than the sprays currently available on the market. The formulation of the invention, for example, can keep a pair of swim goggles free from condensation for a workout of about 4,000 meters, without the need to re-apply it during the session. This is a surprising result if one considers that the anti-fog sprays commonly found on the market lose their effectiveness after several hundred metres of swimming, the goggles start fogging again and the formulation must be reapplied.

SUMMARY OF THE INVENTION

The present invention concerns a cosmetic formulation comprising a mixture of ionic, non-ionic and amphoteric surfactants and hyaluronic acid or a salt thereof.

In addition to these main ingredients, the formulation also contains cosmetic excipients, such as acidifying, chelating, conditioning, thickening, preservative and antiseptic agents.

The formulation is preferably in the form of an aqueous solution that can be dispensed by means of a spray applicator.

The solution is used as an anti-fog solution for swim goggles, snorkeling and scuba diving masks and ski goggles.

DETAILED DESCRIPTION OF THE INVENTION The main ingredients of the cosmetic formulation are anionic, non-ionic and amphoteric surfactants and hyaluronic acid or salts thereof.

For example, the anionic surfactants are alkyl sulfonates such as sodium laureth sulfate. The alkyl sulfonates are included in the formulation in an amount ranging from 0.1 to 0.2% by weight.

The preferred non-ionic surfactants are alkyl esters of saccharose, for example coco-glucoside. The alkyl esters of saccharose are present in the formulation in an amount ranging between 0.5% and 1 % by weight.

For example, the coco-glucoside is marketed by BASF and has the following preferred composition: C8-16 alkyl polyglucoside, C8-10 alkyl polyglucoside, and C10-16 alkyl polyglucoside.

Other non-ionic surfactants with a high emulsifying power are the esters of fatty acids, preferably derived from a reaction between a fatty acid and an alcohol, such as polyethylene glycol (PEG). Among the non-ionic surfactants derived from fatty acids, PEG-80 sorbitan laurate and PEG- 150 distearate are preferred. The esters of fatty acids are included in the formulation in an amount ranging from 0.05% to 0.15% by weight. In addition to being surfactants, these esters also show emulsifying properties.

Other non-ionic surfactants used in the formulation are polysorbate 20 for example. The latter is present in the formulation in an amount ranging from 0.05% to 0.1 % by weight.

The amphoteric surfactants are for example derivatives of coconut fatty acids, such as sodium cocoamphoacetate, sodium cocoamphopropionate, disodium cocoamphodiacetate and disodium cocoamphodipropionate.

One or more of these surfactants are present in the formulation in an amount ranging between 0.1 % and 0.9% by weight. Hyaluronic acid can be used in the form of a salt such as sodium hyaluronate. This ingredient is present in the formulation in an amount ranging from 0.002 to 0.01 % by weight. In addition to surfactants and hyaluronic acid, the aqueous solution can also comprise other ingredients, such as preservatives (e.g. sodium benzoate and/or potassium sorbate). The preservatives are present in the formulation in an amount ranging from 0.01 to 0.05% by weight.

Other ingredients that may be present in the formulation are film-forming agents (such as polyquaternium-10 and/or polyquaternium-7). The film- forming agent is present in the formulation in an amount ranging from 0.01 to 0.02% by weight.

Other ingredients that may be present are chelating agents, such as EDTA and/or tetrasodium glutamate diacetate. The chelating agent is present in the formulation in an amount ranging from 0.01 to 0.02% by weight.

Other ingredients that may be present are acidifying agents (e.g. citric acid), preferably in an amount ranging from 0.05 to 0.1 % by weight, and sodium chloride as a thickener, preferably in an amount ranging from 0.01 to 0.09% by weight.

Optionally, antiseptic agents, for example boric acid and/or sodium borate, may be present in the formulation. The amount of antiseptic agents ranges between 0.002 and 0.008% by weight.

The formulation contains demineralized water in a sufficient quantity up to a total of 100 ml.

In a preferred embodiment, the formulation of the invention is an aqueous solution containing the following ingredients: COCO GLUCOSIDE, preferably 0.5 to 1 %, DISODIUM COCOAMPHODIACETATE, preferably 0.1 to 0.9%, SODIUM LAURETH SULFATE, preferably 0.1 to 0.2%, PEG- 150 DISTEARATE, preferably 0.05 to 0.15%, POLYSORBATE 20 0.01 %, preferably 0.05 to 0.15%, CITRIC ACID, preferably 0.05 to 0.15%, SODIUM CHLORIDE 0.06%, preferably 0.01 to 0.09%, SODIUM BENZOATE, preferably 0.01 to 0.05%, POTASSIUM SORBATE 0.02%, preferably 0.01 to 0.05%, TETRASODIUM GLUTAMATE DIACETATE, preferably 0.01 to 0.02%, POLYQUATERNUM-7, preferably 0.01 to

0.02%, SODIUM HYALURONATE, preferably 0.002 to 0.01 %, BORIC ACID 0.005%, preferably 0.002 to 0.008%, SODIUM BORATE 0.005%, preferably 0.002 to 0.008% and DEMINERALIZED WATER in a sufficient quantity up to 100 ml. The percentages are percentages by weight. The aqueous solution of the formulation is prepared by dissolving one or more surfactants, the preservative agent and the antiseptic agent in demineralized water, under stirring. The emulsifying agent, the thickener, the chelator and hyaluronic acid or salts thereof are added thereafter.

The solution thus obtained is vigorously stirred, sodium chloride is added and subsequently the acidifier is added to stabilize the pH.

The solution is kept under stirring for a time ranging between 20 and 60 minutes, then it is left to rest for several hours prior to use.

The formulation of the invention has proved to be particularly effective in keeping swim goggles clear (that is, free of the layer of condensed water droplets) for a surprisingly long time, that is, up to about 4,000 metres in a workout/training session in a pool (about 1 -2 h), without having to re-apply the formulation.

After this period of time, the formation of the layer of patina is observed and it is thus necessary to repeat the application.

The anti-fog formulations known in the field lose their effectiveness in a remarkably shorter time and force the swimmer to interrupt a workout/training session in order to re-apply the solution a number of times.

The solution of the invention has proved to be particularly effective also in protecting snorkeling and scuba diving masks and swim goggles from fogging even in salt water.

The same effectiveness has also been observed for ski goggles.

The solution of the invention is applied on the goggles by means of a spray applicator, preferably a 30-ml applicator. One proceeds by spraying a suitable amount of solution on the inner lenses of the goggles. Then any excess solution is eliminated by rinsing the goggles in the pool (or sea) water, or by simply overturning the goggles so as to let the excess liquid drain out.

An object of the invention is the use of the formulation according to the invention as an anti-fog solution for swim goggles, snorkeling and scuba diving masks and ski masks.

FORMULATION EXAMPLE

An example of the formulation of the invention: aqueous solution 100 ml.

COCO GLUCOSIDE 0.6%

DISODIUM COCOAMPHODIACETATE 0.4%

SODIUM LAURETH SULFATE 0.1 %

PEG-150 DISTEARATE 0.1 %

POLYSORBATE 20 0.01 %

CITRIC ACID 0.07%

SODIUM CHLORIDE 0.06%

SODIUM BENZOATE 0.03%

POTASSIUM SORBATE 0.02%

TETRASODIUM GLUTAMATE DIACETATE 0.01 %

POLYQUATERNIUM-7 0.01 %

SODIUM HYALURONATE 0.005%

BORIC ACID 0.005%

SODIUM BORATE 0.005%

DEMINERALIZED WATER q.s. up to 100 ml

The percentages are percentages by weight.

METHOD OF PREPARATION

Demineralized water is introduced into the primary batch. In another container, boric acid is dissolved by heating. Under stirring, the preservatives, the disinfectants and the various surfactants are introduced into the primary batch first.

Then, the emulsifying agent, the thickener, the chelator and sodium hyaluronate are added.

Under vigorous stirring, sodium chloride is introduced and subsequently the acidifier is introduced to stabilize the pH.

The solution is kept under stirring for 30 minutes, then it is left to rest for several hours prior to use.

The formulation thus obtained is applied in a spray form onto the inner lenses of the swim goggles; the goggles are rinsed in the pool water and then worn for a workout of up to 4,000 metres.

Claims

1 . A cosmetic anti-fog formulation for eyeglasses, swim goggles, snorkeling and scuba diving masks, and ski goggles, said formulation comprising alkyl sulfonates, alkyl esters of saccharose, esters of fatty acids, derivatives of coconut fatty acids and hyaluronic acid or a salt thereof.

2. The cosmetic formulation according to claim 1 , wherein said alkyl esters of saccharose are coco glucoside, preferably present in an amount ranging between 0.5% and 1 % by weight.

3. The cosmetic formulation according to claim 1 , wherein said esters of fatty acids are polyethylene glycol (PEG).

4. The formulation according to claim 1 , wherein said esters of fatty acids are PEG-80 sorbitan laurate or PEG-150 distearate, preferably present in an amount ranging from 0.05% to 0.15% by weight.

5. The formulation according to any of claims 1 to 4, wherein said derivatives of the coconut fatty acids are selected from among sodium cocoamphoacetate, sodium cocoamphopropionate, disodium cocoamphodiacetate and disodium cocoamphodipropionate, and preferably one or more of these surfactants are present in the formulation in an amount ranging between 0.1 % and 0.9% by weight.

6. The formulation according to any of claims 1 to 5, wherein hyaluronic acid or a salt thereof is present in the formulation in an amount ranging from 0.002 to 0.01 % by weight.

7. The formulation according to any of claims 1 to 6, further comprising one or more of the following: preservatives, preferably sodium benzoate and/or potassium sorbate; film-forming agents, preferably polyquaternium- 10 and/or polyquaternium-7; chelating agents, preferably EDTA and/or tetrasodium glutamate diacetate; acidifying agents, preferably citric acid; thickening agents, preferably sodium chloride; antiseptic agents, preferably boric acid and/or sodium borate; and demineralized water.

8. The formulation according to any of claims 1 to 7, formulated as an aqueous solution for sprayed application.

9. The formulation according to any of claims 1 to 8, comprising the following ingredients: COCO GLUCOSIDE, preferably 0.5 to 1 %, DISODIUM COCOAMPHODIACETATE, preferably 0.1 to 0.9%, SODIUM LAURETH SULFATE, preferably 0.1 to 0.2%, PEG-150 DISTEARATE, preferably 0.05 to 0.15%, POLYSORBATE 20 0.01 %, preferably 0.05 to 0.15%, CITRIC ACID, preferably 0.05 to 0.15%, SODIUM CHLORIDE 0.06%, preferably 0.01 to 0.9%, SODIUM BENZOATE, preferably 0.01 to 0.05%, POTASSIUM SORBATE 0.02%, preferably 0.01 to 0.05%, TETRASODIUM GLUTAMATE DIACETATE, preferably 0.01 to 0.02%, POLYQUATERNIUM-7, preferably 0.01 to 0.02%, SODIUM HYALURONATE, preferably 0.002 to 0.01 %, BORIC ACID 0.005%, preferably 0.002 to 0.008%, SODIUM BORATE 0.005%, preferably 0.002 to 0.008% and DEMINERALIZED WATER in a sufficient quantity up to 100 ml.

10. The formulation according to claim 9, comprising the following ingredients:

COCO GLUCOSIDE 0.6%

DISODIUM COCOAMPHODIACETATE 0.4%

SODIUM LAURETH SULFATE 0.1 %

PEG-150 DISTEARATE 0.1 %

POLYSORBATE 20 0.01 %

CITRIC ACID 0.07%

SODIUM CHLORIDE 0.06%

SODIUM BENZOATE 0.03%

POTASSIUM SORBATE 0,02%

TETRASODIUM GLUTAMATE DIACETATE 0.01 %

POLYQUATERNIUM-7 0.01 %

SODIUM HYALURONATE 0.005%

BORIC ACID 0.005% SODIUM BORATE 0.005%

DEMINERALIZED WATER a sufficient quantity up to 100 ml

1 1 . Use of the cosmetic formulation according to any of claims 1 to 10 to prevent fogging of eyeglasses, swim goggles, snorkeling and scuba diving masks, and ski goggles.