Nail polish composition comprising a gradient polymer and the cosmetic process of treating or caring for nails

A gradient copolymer and composition technology, which can be used in medical preparations containing active ingredients, cosmetics, manicure, etc., and can solve problems such as polymer phase separation

Inactive Publication Date: 2004-08-18
LOREAL SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of random polymers, such as conventional acrylic polymers obtained by conventional free-radical polymerization of monomers mixed randomly, does not satisfactorily solve these problems
This is because random polymers known in the prior art exhibit a dispersion in polymer chain composition which also leads to phase separation of the polymers in the formulation

Method used

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  • Nail polish composition comprising a gradient polymer and the cosmetic process of treating or caring for nails
  • Nail polish composition comprising a gradient polymer and the cosmetic process of treating or caring for nails
  • Nail polish composition comprising a gradient polymer and the cosmetic process of treating or caring for nails

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0250] Embodiment 1: the bulk synthesis of gradient copolymer

[0251] The mixture of reactants is as follows:

[0252] -MONAMS: 3.0g

[0253] -SG1: 0.18g

[0254] - Ethyl acrylate: 480g i.e. 80% by weight / total weight of monomers

[0255] - Styrene: 60g i.e. 10% by weight / total weight of monomers

[0256] -Methacrylic acid: 60g i.e. 10% by weight / total weight of monomers

[0257]The combined components were mixed under a nitrogen atmosphere in the absence of solvent, then heated for 198 minutes at a temperature maintained between 110 and 115°C. The reaction was stopped at 60% conversion.

[0258] The simulated calculation of the gradient gives figure 2 the curve shown. Theoretical predictions lead to an incorporation of 30% (styrene / methacrylic acid) mixture and 70% ethyl acrylate.

[0259] Monitoring of the relative concentrations of the three monomers by gas chromatographic and NMR analysis of the polymer confirmed this model. By these methods, the final chemica...

Embodiment 2

[0269] Example 2: Bulk synthesis of gradient copolymers

[0270] Various copolymers were prepared according to the procedure described in Example 1, starting from the reactant mixture as follows:

[0271] -MONAMS: 3.0g

[0272] -SG1: 0.18g

[0273] - Styrene: 60g

[0274] -Methacrylic acid: 60g

[0275] Example

Embodiment 3

[0276] Example 3: Synthesis carried out in the presence of a solvent

[0277] The same synthesis as in Example 1 was carried out except in the presence of a solvent.

[0278] The mixture of reactants is as follows:

[0279] -MONAMS: 3.43g

[0280] -SG1: 0.2g

[0281] - Ethyl acrylate: 336g

[0282] - Styrene: 42g

[0283] -Methacrylic acid: 42g

[0284] -Toluene: 180g

[0285] The combined components were mixed in toluene as solvent under nitrogen atmosphere and then heated for 198 minutes at a temperature maintained between 110 and 115°C.

[0286] The final conversion was 82% and the resulting solids level was 57.2% by weight.

[0287] The following analysis results were obtained:

[0288] Mn=30 570 g / mol, Mw=50 500 g / mol and PI=1.65. The degree of dispersion (or w) of the composition was 2.0.

[0289] The final composition of the copolymer was given by liquid adsorption chromatography (LAC), which showed a similar composition to the copolymer prepared in Example ...

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Abstract

The present disclosure relates to a nail varnish composition comprising at least one film-forming gradient copolymer exhibiting a mass polydispersity index (PI) of less than or equal to 2.5, the said composition being capable of forming a film exhibiting a rate of loss of weight of less than 1 mg / minute when the film is subjected to abrasion produced with the Taber abrasion tester at 23 DEG C. The invention also relates to a cosmetic process for making up or caring for the nails.

Description

technical field [0001] The present invention relates to novel cosmetic compositions, especially cosmetic compositions and more particularly nail polish compositions, comprising specific copolymers, especially amphiphilic gradient copolymers, which are preferably soluble or dispersible in The composition exhibits good retention in water and / or organic solvents. Background technique [0002] Nail polish compositions are known generally comprising a film-forming polymer in an organic solvent medium or an aqueous medium. After drying, the nail varnish forms a colored or colorless film on the nail, making it possible to finish the nail or to protect it against external aggressions such as rubbing or scratching. In fact, nail polish is often less durable over time: after a day or two, the film of nail polish often deteriorates, especially by flaking or debonding. This type of deterioration often occurs at the tip of the nail. When the nail polish is damaged, the user has to rem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K8/00A61K8/41A61K8/46A61K8/49A61K8/81A61Q3/00A61Q3/02
CPCA61K8/8152A61K2800/54A61Q3/02A61B10/00A61K49/08C08B37/00
Inventor N·穆然C·卡泽纳夫M·维西克
Owner LOREAL SA
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