CS231292B1 - Nail polish - Google Patents

Abstract

Nail polish based on nitrocellulose, synthetic resins, which are modified glycerin phthalate resins and polybutyl methacrylate, plasticizers, mixtures of organic solvents and modified organophilic clay, characterized by high stability of suspended particles, which are organic and/or inorganic pigments. The stability of the suspension is achieved by thixotropy. The rheological properties of the varnish are adjusted so that the consistency stabilizes over a certain period of time and does not increase further, while the desired properties of the dried varnish film such as gloss, adhesion and elasticity are maintained due to the composition of the varnish.

Description

231,292

The invention relates to a stable suspension of thixotropic nail polish, the film-forming component of which, in addition to nitrocellulose, consists of an acrylic resin in the form of polybutyl methacrylate, a mixture of organic solvents, a modified glycerin phthalate resin, controlling additives, thixotropic agents and inorganic and organic pigments.

Solutions of film-forming substances in organic solvents, used as nail polishes, which form a film on the nail after drying in air, are generally known. In most cases, nitrocellulose is used as the only or one of the film-forming components, and alkyd, sulfonamide-formaldehyde or ketone resins are most often used, which modify the properties of the air-dried film.

The vast majority of varnishes contain organic or inorganic pigments and/or natural or synthetic pearlescent pigments, the general property of which is to form a sediment due to their higher specific gravity.

To eliminate this undesirable phenomenon, modified organic clays based on bentonite or montmorillonite have been used, which swell in organic solvents and give the entire system thixotropic properties. This is described in US patent No. 3,422,185 and French patent No. 1,439,106 and Canadian patent No. 640,719, as well as in Czechoslovak Patent Nos. 181,402, 201,931 and 209,973.

Various compositions and methods of preparing thixotropic additives are described, such as in Japanese Patent No. 895,953, where a polar solvent and an inorganic acid are added to an organophilic clay and the mixture is dispersed into a varnish, as well as in Japanese Patent Application Publications / K0K0KU / No. 47 - 40375/72 and / KOKAI / No.

- 97830/74. The shortcomings of these procedures, where powdered substances are used, which form agglomerates if homogenized insufficiently, are addressed, for example, by Japanese patent application No. 52 - 145528/77, which recommends the preparation of scales that are made from modified organophilic clay, nitrocellulose, and plasticizers such as dibutyl phthalate.

231 292 lates, acetyltributyl citrate and organic solvents at elevated temperature and pressure. These flakes then provide a thixotropic gel in a mixture of organic solvents. A similar solution is provided by LOS 28 54 109, where polyethylene glycols, polypropylene glycols and polyoxyethylene ethers of fatty acids are used in a mixture with organophilic clays to prepare the flakes. However, it is known that the use of these modified organophilic clays is associated with, in addition to increased stability, also disadvantageous properties of the varnish film, such as reduced gloss and lower adhesion to the nail plate. Better results are achieved by taking necessary technological measures when processing organophilic clays, as well as by using various additives, such as lecithin in US Patent No. 4,301,046, cellulose acetobutyrate in Japanese Patent No. 55 - 57512/80, and monoesters in the form of alkyl vinyl ester of maleic acid in LOS 28 30 958.

Another disadvantage of thixotropic systems is the apparent viscosity or consistency increasing over time. The use of acrylate or methacrylate resins as film-forming components is a solution that provides good results in eliminating the above-mentioned defects. LOS 29 13 344 provides a solution using mixtures of acrylates. Swiss patent No. 603 156 describes the use of a copolymer of methyl methacrylate and hexyl methacrylate in a mixture with nitrocellulose, and French patent No. 2,478 998 describes the use of various copolymers of acrylic and methacrylic acid.

The nail polish according to the invention is based on the findings given in Czech Patent Nos. AO 201 931 and 209 973, where it advantageously uses the presence of alkyd resins in a thixotropic varnish system containing modified organophilic clays. It has been proven that a nail polish containing:

1.5 to 6.0 parts by weight of polybutyl methacrylate,

1.0 to 6.0 parts by weight of a 40 to 60% solution of glycerin phthalate resin, modified with castor oil fatty acids,

12.0 to 20.0 parts by weight of low-viscosity nitrocellulose with a nitrogen content of 11.8 to 12.4% and a dry matter content of 60 to 70 2.0 to 6.0 parts by weight of plasticizer,

0.8 to 2.5 parts by weight of modified organophilic clay,

50.0 to 70.0 parts by weight of a mixture of organic solvents and

0.5 to 3.0 parts by weight of pigments has high stability of suspended substances due to thixo-3231 2S2 and is characterized by the fact that the apparent viscosity, measured as consistency according to ČSN 673013, does not increase further after 1 week / Table I / and further that this varnish, after drying, forms a film on the nail, characterized by high gloss, good adhesion and elasticity, the measurements of which are given in Table II.

Table I. Consistency Measurement

Varnish by example 1 hour after preparation within 24 hours, within 1 week, within 2 weeks in 8 weeks now 1 115 ¹⁵¹ 160 162 162 2 128 160 190 195 197 3 118 155 195 196 193

Consistency in seconds according to ČSN 673013, measured with a spout cup with a hole of 0 4 nm.

Table II.

1/ Resistance to digging: 10.6 mm

2/ Hardness: on glass 250 g, the shavings form a continuous, elastic spiral on sheet metal 250 g, the shavings form a continuous, elastic spiral

3/ Adhesion: by grid test 1 x 1 mm - grade A

4/ Adhesive tape adhesion: glass substrate - grade B 1 metal substrate - grade B 1

5/ Internal stress - none

6/ Flexibility in bending - level 1 - resists breakage.

1/ Determination using the Erichsen apparatus

2/ Determination using the Clemen device

3/ Determination by grid section

4/ Determination according to ČSN 673085

5/ Determination according to ČSN 673077

6/ Determination according to ČSN 673077

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The high stability of suspended particles, which are pigments, listed in Table III, is due to the rheological properties of the suspension, which are determined, for example, by viscosity, shear stress and shear rate D, which are given by the relationship

Ί. ⁼ ΠΓ I ^pa · ^s 3 ^{1 =} — [dyn . cm ” ² ] II

F ^{L =} x~ [ ^s ” ¹ ] m

S = force £dynl

F = area £cm

V = velocity [cm.s * ¹ J

X = layer thickness £cmj

Figure 1 shows the viscosity curves of the varnish according to the invention, exhibiting thixotropy. They represent the dependence of viscosity on shear rate. With increasing shear rate, viscosity decreases, which increases again when shear rate decreases. After a certain sufficient time - from several seconds to several hours, the structure is restored to its original state before mechanical stress. The flow curve at increasing and decreasing shear rate represents two non-overlapping curves and the area between them indicates the degree of thixotropy. Thixotropy of the varnish ensures the stability of suspended pigments at rest, i.e. during storage, and during mechanical stress, e.g. application to the nail, due to the transition of the gel into the sol, and also the application of the required rheological properties, such as spillage.

Curve 1 - first measurement from low to high

Curve 2 - instant measurement from higher L _r to lower

Curve 3 - measurement after 1 hour at rest from low D _p to higher

Curve 4 - instant measurement from higher D _p to lower ones.

Table III.

Pigment red Oxygen iron C.I. 77491 Pigment black Oxygen iron C.I. 77499 Titanium white Oxygen titanium C.I. 77891 Zinc white Oxygen zinc C.I. 77947

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Carbon black Soot C.I. 77266 red scarlet Azolac / Ca / C.I. 15525 Red scarlet Azolac / Mn / C.I. 15865 ViiLet Thioindigo C.I. 73300 Burgundy red Azo pigment /Ca salt/ C.I. 15850 Blue Phthalocyanine Cu C.I. 74160 Synthetic mother of pearl Titanium dioxide + mica C.I. 77891 Synthetic pearl necklace Bismuth oxychloride C.I. 77163 Violes Azo pigment /Ca salt/ C.I. 15880 Example 1 2 3

Nitrocellulose E 510 65% dry matter 17.00 % 15.00 % 15.00 % Polybutyl methacrylate 50% solution 6.40 % 8.00 % 7.00 % Glycerin phthalate pr sparkle 2.40 % 3.00 % 4.00 % / 50% solution in water luen / Dibutyl phthalate 4.80 % 4.00 % 4.00 % Ethyl acetate 29.00 % 22.00 % 34.50 % Butyl acetate 20.90 % 30.40 % 20.00 % Toluene 14.00 % 12.40 % 10.00 % Acetone 3.20 % 2.00 % - Organophilic clay /org anic deri- 1.00 % 1.20 % 1.20 % magnesium montmo rillonite/ Ethanol 96% 0.60 % 0.80 % 2.80 % Titanium dioxide C.I. 77891 0.42 % - - Iron red C.I. 77491 0.24 % - 0.12 % Scarlet Red C.I. 15525 - - 0.16 % carbon black C.I. 77266 0.04 % - Blue C.I. 74160 - - 0.02 % Synthetic pearl C.I. 77891 - 1.20 % 1.20 %

C.I. stands for the internationally used pigment designation /Color index/.

-6OBJECT OF THE INVENTION

Claims (2)

231 2 Nail lacquer based on nitrocellulose, synthetic resins, plasticizer, mixture of organic solvents, pigments and modified organophilic clay, characterized in that it contains 1.5 to 6.0 parts by weight of polybutyl methacrylate, 1.0 to 6.0% by weight. parts of a 40-60% glycerin phthalate resin solution modified with castor oil fatty acids, 12.0 to 20.0 parts by weight of low viscosity nitrocellulose containing 11.8 to 12.4% nitrogen and a dry matter content of 60 to 70%. %, 2.0 to 6.0 parts by weight of plasticizer, which is sodium phthalate and optionally camphor, 50.0 to 70.0 parts by weight of a mixture of organic solvents and 0.8 to 2.5 parts by weight of modified organophilic clay. which is an organic derivative of magnesium - montmorilionite. 2. A nail varnish according to claim 1, characterized in that it comprises 0.5 to 3.0 parts by weight of organic and / or inorganic pigments and / or synthetic pearlescent pigments, which is a mixture of mica and titanium dioxide. 1 drawing 231 292