DE102013016013A1 - Light-curing nail polish, useful in a light-curing modeling gel for producing an artificial nail, comprises a light-curing urethane methacrylate and a flowing agent - Google Patents

Abstract

Light-curing nail polish comprises a light-curing urethane methacrylate in an amount of 50-90 wt.% and a flowing agent in an amount of 3-11 wt.%. Independent claims are included for: (1) a light-curing modeling gel for producing an artificial nail, comprising a light-curing urethane methacrylate in an amount of 50-98 wt.% and a consistency regulator in an amount of 0.5-2.5 wt.%; (2) the application of the nail polish, comprising providing at least one two-layer application consisting of a light-cured clear coat and an overlying light-curable color coat, where the two paint layers comprise at least 50 wt.% of urethane methacrylate; and (3) paint application obtainable by the process.

Description

The present invention relates to a nail varnish, in particular a light-curing nail varnish, for application to a nail, such as a fingernail or toenail, a modeling gel for producing an artificial nail, and a method for applying this nail varnish.

Light-curing nail polishes have so far become known only in a two-layer structure in such a way that a first layer of an approximately transparent, gel-like substance is applied to the nail to be coated and this first layer application is cured under the action of UV light. As a rule, this first layer application is a transparent lacquer layer which is light-curing.

On top of this cured, first transparent lacquer layer, a lake layer is also applied from a gel-like plastic, and also cured under the action of UV light.

The prior art are fingernail plastics based on acrylates, methacrylates, urethane and polyester acrylates.

These are modeled on the natural nail using a template or a plastic tip on the natural nail and cured by means of UV light. If you want to remove these coatings, they must be filed down with files. This is time consuming and often the natural nail is affected.

When used as a nail varnish, it is also known to form both layers, both the transparent base layer and the color-carrying top layer, of a methacrylate or a simple acrylate varnish.

The salts and esters of methacrylic acid are referred to as methacrylates. Methacrylic acid dissolves in water, alcohol and ether; the aqueous solution is strongly acidic. It polymerizes very easily by autopolymerization on heating, in the presence of light or in the presence of hydrochloric acid or peroxides to form highly polymeric products. However, by adding stabilizers such as hydroquinone, methacrylic acid can nevertheless be stored for a longer time in monomeric form.

However, attempts by the applicant have shown that such methacrylate paints or acrylate paints have the serious disadvantage that they can be removed only with great effort. It is known to either remove the applied, light-curing methacrylate lacquer with a grinding wheel or to dissolve with a corresponding solvent, thereby swelling the paint in order to then be able to remove it mechanically.

Such a product is sold under the brand name Shellac.

Moreover, it is known to stabilize all commercially available nail gels used to protect them from autopolymerization. For this purpose, mostly hydroquinone or hydroquinone monomethyl ether (HQME) is used.

Such autopolymerization inhibitors are classified as hazardous according to the Cosmetics Regulation, must be declared and may only be used to a certain extent.

The invention is therefore based on the object, a light-curing nail polish of the type mentioned in such a way that the omission of monomers with low molecular weight an allergy release is greatly reduced in persons sensitive to these monomers people. Low molecular weight or low molecular weight in the sense of the invention means a molecular weight of less than 300 g / mol, preferably less than 250 g / mol, and more preferably less than 200 g / mol.

To solve the problem, the invention is characterized by the technical teaching of claim 1.

The invention accordingly light-curing urethane acrylates, urethane methacrylates or a mixture of the two, which can be worn permanently as nail polish or nail gel formulations, or mechanically peeled at any time without damaging the natural nail.

Urethane methacrylates are compounds or monomers which contain at least one urethane group (-NH-COO-) and at least one methacrylate group. Urethane acrylates are compounds or monomers which contain at least one urethane group (-NH-COO-) and at least one acrylate group.

Light-curing or photo-curing means that the urethane methacrylates and / or the urethane acrylates are brought to polymerization by light, preferably by ultraviolet light (UV light), optionally with the aid of photoinitiators.

The nail varnish according to the invention accordingly comprises a urethane methacrylate or a urethane acrylate and a flow agent. The urethane methacrylate and the urethane acrylate may be aliphatic linear, aliphatic branched, cyclic or cycloaliphatic.

Preferred urethane methacrylates are "Exothane 32" and "Exothane 26", both commercially available from Esstech Inc., USA.

The weight proportion of the urethane methacrylate, the urethane acrylate or a mixture thereof has a weight fraction of 50 to 90% of the total mass of the nail polish, preferably from 55 to 90% of the total mass, more preferably from 60 to 90% of the total mass, and more preferably from 65 to 90 % of the total mass of nail polish.

Plasticizers improve the flow properties of nail polish. This allows, inter alia, a lighter and more homogeneous application of the nail polish. The flow agents used are solvents, preferably organic solvents, or solvent mixtures. Preferred solvents are ethyl acetate, butyl acetate, acetone, isopropyl alcohol, siloxanes or surfactants.

The flow agent has a weight fraction of 3 to 11% of the total mass of the nail polish, preferably from 5 to 11% of the total mass of the nail polish, and more preferably from 8 to 11% of the total mass of the nail polish.

The nail varnish according to the invention preferably comprises as further components at least one photoinitiator and at least one sunscreen agent.

Photoinitiators are used to initiate the polymerization reaction of the (meth) acrylate system ("curing"). In this case, the photoinitiator can be reacted by irradiation with light, in particular UV light. Suitable photoinitiators are preferably diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide (commercially available as "Genocure TPO" from Rahn AG) or 1-hydroxycyclohexyl phenyl ketone (commercially available as "Irgacure 184" from Ciba, now BASF) and Mixtures thereof.

A sunscreen agent basically has the function of filtering harmful UV light and acts as a free radical scavenger. Sunscreen agents can be added to the nail polish of the invention to increase the life of the finished, cured nail polishes. In addition, the sunscreen agent prevents the discoloration and delamination of the cured nail polishes and retains its surface properties.

Preferred sunscreen agents are a mixture of bis (1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate and 1- (methyl) -8- (1,2,2,6,6-pentamethyl) 4-piperidinyl) sebacate (commercially available as "Tinuvin 292" from Ciba, now BASF).

The particular proportion by weight of the at least one photoinitiator and of the at least one sunscreen agent in the light-curing nail varnish is preferably from 0.1 to 2.5% of the total mass of the nail varnish, more preferably from 0.15 to 2.1% of the total mass of the nail varnish.

The nail varnish according to the invention preferably comprises at least one dye as further component. Such a nail polish is then referred to as a color coat. Suitable dyes are preferably "Kronos 1171 titanium dioxide" (commercially available from Kronos International), Unipure Yellow LC 124 (commercially available from Sensient Cosmetic Technologies), Unipure Red LC328 (commercially available from Sensient Cosmetic Technologies), and mixtures thereof.

The weight fraction of the sum of all the dyes in the nail polish is preferably between 2 and 5%, more preferably between 2.5 and 4.8%, and most preferably between 3 and 4.7% of the total mass of the nail polish.

If the nail varnish according to the invention contains no dye, it is referred to as clearcoat.

The present invention further provides a photohardening modeling gel for making an artificial nail. The light-curable modeling gel of the invention contains a light-curing urethane methacrylate having a weight fraction of 50 to 98% of the total mass, preferably 55 to 98% of the total mass, more preferably 60 to 98% of the total mass, and more preferably 65 to 98% of the total mass. The light-curable modeling gel according to the invention also contains a bodying agent with a weight fraction of 0.5 to 2.5% of the total mass, preferably from 0.9 to 2.2% of the total mass, more preferably from 1.2 to 1.9% of total mass

The light-curable modeling gel of the present invention may preferably contain at least one photoinitiator and at least one sunscreen agent, both as defined above. The particular proportion by weight of the at least one photoinitiator and of the at least one light protection agent in the modeling gel is preferably from 0.1 to 2.6% of the total mass of the modeling gel, more preferably from 0.3 to 2.3% of the total mass of the modeling Gel, and more preferably 0.4 to 1.8% of the total mass of the modeling gel.

Bodying agents, or else fillers, are usually used for thickening liquids and for stabilizing pigments in paints.

Preferred fillers or bodying agents may be silica, guar gum, fumed silicas or other common fillers. A preferred fumed silica is "Aerosil R-972" with the CAS number 68 611-44-9 (commercially available from Evonik).

It has been recognized according to the invention that although urethane methacrylate paints have poor flowability and are therefore relatively brittle and hard to remove from the coated nail in the cured state, the fluidity of urethane methacrylates can be substantially improved by the addition of a superplasticizer, so that these act like a Adhere film after light curing curing on the nail and therefore can be easily peeled off with a mechanical tool, such as a blade, a scraper or other peeling tool.

This is a new realization because it has been discovered according to the invention that the use of a urethane methacrylate varnish forms a low-shrinking low-stress varnish, a product with low shrinkage, to which the above-mentioned components are used. which was not known yet. It is therefore low-shrinkage components that are used for the first time according to the invention as a light-curing nail polish. The tension-free, low-shrinkage curing of nail varnish or modeling gel of the invention under the influence of UV light does not cause any feeling of tension on the nail and thus achieves a high and comfortable fit.

The shrinkage stress of the nail varnish according to the invention and the modeling gel according to the invention was measured with an Instron Tensiometer according to the method ACTA Amsterdam. The shrinkage stress is the force that arises during a curing process.

Since no low molecular weight monomers are added according to the invention, there may be less risk of allergies to products.

The invention further provides a method of using the nail polish of the invention. The method is characterized in that an at least two-layer application is provided, consisting of a clearcoat and a color coat disposed above, wherein both the clearcoat and the color lacquer per se are each formed light-curing and subjected to light curing, and that the two lacquer layers each containing as component a urethane methacrylate having a weight fraction of at least 50 percent of the total weight of the paint, preferably at least 55%, more preferably 60% and most preferably at least 65% of the total weight of the paint. In the process of the invention, the clearcoat and / or the inventive colorcoat, both as defined above, are particularly preferably used. The light curing is preferably carried out by UV light, for example by a UV lamp.

In one development of the invention, it can also be provided that, for a permanent wearing of the at least two-layer light-curing nail polish, an adhesive is first applied to the nail, wherein the adhesive also consists of a light-curing plastic.

It is important that the two layers (clear coat layer and colored lacquer layer) of the novel two-layer light-curing nail polish in its cured state can be adjusted to a rubber-elastic or elastomeric state and thus be mechanically easily removable.

When running under the influence of UV light polymerization process does not develop heat, so this type of color application is very pleasant for the human hand.

Measurements on conventional nail plastics showed a heat development of up to 70 ° C at a layer thickness of 1 mm. The lacquers and nail gels according to the invention heat below 30 ° C. On average, the heating is 27 ° C at 1 mm layer thickness.

The conversion rate of the components used is between 90 and 99 percent, and this with a negligible shrinkage stress of less than 0.5 MPa.

It is important that the at least two-layer light-curing nail polish with a simple instrument, such as a wooden stick or a scaler or the like, can be removed.

• 1. Der Naturnagel wird wie üblich vorbereitet.
• 2. Wenn eine permanente Beschichtung des zweischichtigen lichthärtenden Nagellacks gewünscht ist, wird im zweiten Schritt ein Haftmittel aufgetragen, welches für eine Dauer von zum Beispiel ein Mal oder zwei Mal 60 Sekunden unter UV-Licht aushärtet. Es kann dann gegebenenfalls auch eine weitere Schicht aufgetragen werden, um bei Rillennägeln eine Ausfüllung der Rillen zu ermöglichen.
• Sofern aber eine ablösbare Beschichtung des lichthärtenden Nagellacks gewünscht ist, entfällt der Schritt 2.
• 3. Es wird als Beschichtungsgel ein Klarlack aufgetragen, der für mindestens 30 Sekunden, vorzugsweise mindestens 60 Sekunden unter UV-Licht aushärtet. Gegebenenfalls kann auch eine zweite Schicht aus einem Klarlack aufgetragen werden.
• 4. Es wird ein Farblack aufgetragen, der im Wesentlichen die gleiche Zusammensetzung wie der Klarlack aufweist, nur dass in diesem noch Farbpigmente oder Farbstoffe suspendiert sind. Der Farblack härtet in einer Aushärtezeit von mindestens 30 Sekunden, vorzugsweise 60 Sekunden, mehr bevorzugt mindestens 120 Sekunden unter UV-Licht aus.
• Die verwendeten beiden Schichten aus dem Klarlack und dem Farblack nach dem Schritt 3 und 4 sind gut deckend
• 5. In einem letzten Arbeitsschritt kann gegebenenfalls der aufgetragene und ausgehärtete Farblack noch mit einem Glanzlack überzogen werden, der ebenfalls UV-aushärtbar ausgebildet ist und in seiner Zusammensetzung etwa dem vorher verwendeten Klarlack entspricht. Der 5. Arbeitsschritt ist jedoch nur optional und kann auch entfallen.

The order process is as follows:

• 1. The natural nail is prepared as usual.
• 2. If a permanent coating of the two-layer light-curing nail polish is desired, an adhesive is applied in the second step which cures for a period of, for example, once or twice 60 seconds under UV light. If necessary, a further layer can then also be applied in order to allow filling of the grooves in groove nails.
• However, if a detachable coating of the light-curing nail polish is desired, the step 2 is omitted.
• 3. A clearcoat is applied as the coating gel which cures for at least 30 seconds, preferably for at least 60 seconds under UV light. Optionally, a second layer of a clearcoat may also be applied.
• 4. It is applied to a lake, which has substantially the same composition as the clearcoat, except that in this color pigments or dyes are suspended. The color coat cures in a curing time of at least 30 seconds, preferably 60 seconds, more preferably at least 120 seconds under UV light.
• The two layers of the clear coat and the color coat used after step 3 and 4 are well opaque
• 5. In a final step, optionally, the applied and cured color coat can be coated with a gloss varnish, which is also formed UV-curable and in its composition corresponds approximately to the previously used clearcoat. The 5th step is only optional and can be omitted.

Importantly, the nail varnishes and modeling gels of the present invention are free of added 2-hydroxyethyl methacrylate (HEMA) or triethylene glycol dimethacrylate (TEGDMA) or other low molecular weight monomers that may be of concern in terms of triggering allergies. The elimination of TEGDMA and HEMA or other low molecular weight monomers may be beneficial for allergy sufferers reacting to these substances.

The invention further provides a paint application obtainable by the method of the invention described above.

The substances used result in a painted nail or an inking that shrinks compared to conventional nail gels up to a factor of 2 less. This results in the advantage that the existing of the multiple layers of paint does not feel as a foreign body on the nail.

The multilayer nail polish of the invention and the nail gel according to the invention have a shrinkage stress of less than 0.8 MPa, preferably less than 0.6 MPa and most preferably less than 0.5 MPa during curing. This has the advantage that the gel or paint application feels natural and not foreign.

The gel as well as the paint application are highly elastic and adapt to the growth of the natural nail without causing tensions or stress cracks. Chipping was not detected.

The layers used have a high scratch resistance due to the elastic properties, in the scratch test with threaded screws show no measurable scratch marks, as they are usually visible in conventional gels.

The gel as well as the paint application have a good high gloss, so that it does not require a sealant gel. This saves work and time.

The gel as well as the paint application have a good self-smoothing effect, so that it does not flow into the nail bed. As a result, minor bumps on the nail surface are automatically compensated.

Without an adhesive, the two-layer nail gel application as well as the application of paint can last for at least 4 weeks, depending on the type of nail preparation. It can be mechanically removed very easily according to the invention. There is no need to use solvents.

The subject of the present invention results not only from the subject matter of the individual claims, but also from the combination of the individual claims with each other.

All information and features disclosed in the documents, including the abstract, in particular the spatial design shown in the drawings, are claimed to be essential to the invention insofar as they are novel individually or in combination with respect to the prior art.

In the following the invention will be explained in more detail with reference to drawings showing only one embodiment. Here are from the drawings and their description further features essential to the invention and advantages of the invention.

Show it:

1 a possible embodiment of the coating of a natural nail with a two-layer light-curing nail polish

2 : the same design as 1 with the modification of layers

3 : the embodiment similar to the 1 showing how the two-layer, light-curing nail polish is mechanically removed

4 : the top view of the arrangement after 3

5 A further embodiment in which it is shown that an artificial nail with a modeling gel can be permanently attached to the natural nail

The 1 shows a nail 1 , which is shown as a natural nail of a human carrier and optionally as the first surface an adhesive 14 can carry. It is important that the adhesive 14 can also be omitted and that directly on the surface 2 of the nail 1 a light-curing clearcoat 3 can be applied. After light curing of the clearcoat 3 In a further operation, the color varnish 4 applied, which is also UV-cured after application.

When the nail job is finished, it essentially consists of the two layers 3 and 4 , because - as mentioned - the adhesive 14 can also be omitted.

2 Referring to FIG 1 in that in addition also the surface of the paint 4 with a gloss varnish 5 can be covered.

It is important that the in principle two-layered structure easily by a mechanical peeling instrument 6 according to 3 can be removed. The blade 7 this peeling instrument 6 is placed behind the nail bed-next edge of the light-curing nail polish job and in the direction of the arrow 8th against the back edge of this Build up moves, so that the lugs 10 . 11 up the two layers and in the direction of the arrow 9 arch up in the manner of a peeling process and peeled off.

This shows also the 4 as a top view of the 3 , where it is shown that the individual foil-like layers in the directions of the arrows 9 Track by train can be removed lying side by side.

However, it can also be provided that the two-layer nail polish application of the layers 3 and 4 total deducted as a unitary body. It's like a strong adhesive foil made of natural nail 1 is pulled down.

The 5 shows as a further embodiment that with the paint, either as a clearcoat 3 or as a color coat 4 is formed, even an artificial nail 13 can be produced. This shows the 5 an adhesive 14 that on the nail 1 is applied. On the surface of the hardened adhesive 14 becomes a modeling gel 12 applied, the clear coat 3 or the color coat 4 similar in composition and viscosity.

So that the artificial nail 13 The natural nail can usually become a template 15 used that over the natural nail 1 protruding supernatant and later after curing of the modeling gel 12 Will get removed.

In this way, artificial nails 13 whose front sides are the edge of the natural nail 1 survive.

In the following, the invention will be explained in more detail by way of examples. Example 1: Formulation of Clearcoat and Sealer components Amount / g Wt .-% Exothane 32 urethane 500.00 88.95 Irgacure 184 photoinitiator 0.66 0.118 Genocure TPO photoinitiator 0.56 0,099 Tinuvin 292 sunscreen 0.89 0.158 ethyl acetate superplasticizer 60,00 10.674 Example 2: Formulation of the color lacquer components Amount / g Wt .-% Exothane 32 urethane 502.20 83.348 Genocure TPO photoinitiator 6.05 1,004 Irgacure 184 photoinitiator 4.14 0.687 Tinuvin 292 sunscreen 2.05 0.340 Titanium dioxide Kronos 1171 dye 5.03 0.835 Unipure Yellow LC124 MIMOX dye 5.05 0.839 Unipure Red LC328 MIMOX dye 18.01 2,989 ethyl acetate superplasticizer 60 9.958 Example 3: Formulation of the modeling gel components Amount / g Wt .-% Exothane 26 urethane 494.20 95.97 Irgacure 184 photoinitiator 4.51 0.876 Genocure TPO photoinitiator 4.53 0.880 Tinuvine 292 sunscreen 2.55 0.495 Aerosil R 972 bodying 9.16 1,779

LIST OF REFERENCE NUMBERS

1

nail

2

surface

3

clearcoat

4

color paint

5

gloss paint

6

peeling tool

7

blade

8th

arrow

9

arrow

10

Approach (from 3 )

11

Approach (from 4 )

12

Modeling gel

13

artificial nail

14

adhesives

15

template

Claims (10)

A light-curing nail varnish comprising a light-curing urethane methacrylate having a weight fraction of 50 to 90% of the total mass and a flow agent having a weight fraction of 3 to 11% of the total mass. Nail varnish according to claim 1, characterized in that at least one photoinitiator and at least one sunscreen agent, each with a weight proportion of 0.1 to 2.5% of the total mass are admixed. Nail varnish according to claim 1 or 2, characterized in that at least one dye with a weight proportion of 2 to 5% of the total mass is added. Nail varnish according to one of claims 1 to 3, characterized in that the nail varnish are free of 2-hydroxyethyl methacrylate (HEMA) or triethylene glycol dimethacrylate (TEGDMA) or other low molecular weight monomers. Light-curing modeling gel ( 12 ) for the production of an artificial nail ( 13 ) containing a light-curing urethane methacrylate having a weight fraction of 50 to 98% of the total mass and a bodying agent with a weight fraction of 0.5 to 2.5% of the total mass. Method for applying a nail polish according to one of claims 1 to 4, characterized in that a at least two-layer application consisting of a light-curing clearcoat ( 3 ) and a light-curing colored lacquer ( 4 ) is provided, and that the two paint layers each contain as a component a urethane methacrylate with a weight fraction of at least 50 percent of the total mass of the paint. A method according to claim 6, characterized in that in a first step, first the clearcoat ( 3 ) on the natural nail ( 1 ), which cures for at least 30 seconds under UV light, and that in a second step, the color coat ( 4 ) on the cured clearcoat ( 3 ), which cures for at least 30 seconds under UV light. A method according to claim 7, characterized in that prior to the first step, a light-curing adhesive on the natural nail ( 1 ) is applied. Method according to one of claims 7 or 6, characterized in that the cured paint ( 4 ) a light-curing gloss varnish ( 5 ) is applied. Paint application obtainable by a process according to one of claims 6 to 9.

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