Toilet – Methods – Hair treatment by application of specific chemical composition
Patent
1994-05-09
1996-09-10
Swiatek, Robert P.
Toilet
Methods
Hair treatment by application of specific chemical composition
424 701, A61K 706
Patent
active
055536301
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns the use of metal oxide nanopigments for protecting hair keratin against atmospheric attack, especially light, a method of protecting hair and a gel composition using these metallic oxide nanopigments.
It is well known that light attacks hair keratin. Several publications have demonstrated that natural light destroys certain aminoacids in the hair and, in changing the nature of hair fibre, reduces mechanical properties such as tensile strength, breaking stress and elasticity.
Tensile strength can be measured using the 15% extension level. This is the force which must be applied to a wet strand of hair of a given length to lengthen it permanently by 15%. The higher the force required, the stronger and more elastic is the strand.
Polyaminoamides (French patent FR-A-2 599 968) and light filtering substances such as 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid and its salts (French patent FR-A-2 627 085) or 4-(2-oxo-3-bornilydene methyl)benzene sulfonic acid and its salts (European patent application No 0 329 032) have been suggested to protect hair keratin against attack by light.
It has surprisingly been discovered by the applicant that metal oxide nanopigments of titanium, zinc, cerium or zirconium with an average diameter of less than 100 nanometers, in particular between 5 and 50 nanometers, can preserve the hair's mechanical properties, especially tensile strength and elasticity, against their degradation by light. This property has been revealed by exposure to natural light (sunny environment) and to artificial light (xenon emitter of a SUNTEST HANAU accelerated ageing apparatus).
The present invention therefore consists in the use of metal oxide nanopigments of titanium, zinc, cerium or zirconium or mixtures thereof for protecting the mechanical properties of hair, in particular tensile strength, against degradation by atmospheric attack, in particular by light.
The term "nanopigments" means pigments with an average diameter of less than 100 nanometers, preferably between 5 and 50 nm.
The metal oxides may be coated or uncoated.
Coated pigments are pigments which have been chemically, electronically, mechanochemically and/or mechanically surface treated with compounds such as those described in Cosmetics & Toiletries 1990, Vol 105, February 1990, p 53-64, for example amino acids, beeswax, fatty acids, fatty alcohols, anionic surfactants, lecithins, sodium, potassium, zinc, iron or aluminum salts of fatty acids, sodium hexametaphosphate, metal (titanium or aluminum) alkoxides, polyethylene, silicones, proteins (collagen, elastin), alkanolamines, silicon oxides, and other metal oxides.
Particularly preferred coated pigments are titanium oxides coated with: from TIOXIDE, and UVT 14/4 from KEMIRA, TITAN KOGYO,
Metal oxide mixtures containing equal weights of titanium oxide and cerium oxide coated with silica, such as SUNVEIL A from IKEDA, can also be cited.
Uncoated titanium oxides are sold by TAYCA under the trade names MT 500 B and MT 600 B, by DEGUSSA under the trade name P 25, by WACKHERR under the trade name "Transparent titanium oxide PW" and by MIYOSHI KASEI under the trade name UFTR, for example.
Uncoated zinc oxides are sold by SUMITOMO under the trade name ULTRA FINE ZINC OXIDE POWDER, by PRESPERSE under the trade name FINEX 25 and by IKEDA under the trade name MZO-25, for example.
Uncoated cerium oxide is sold by RHONE POULENC under the trade name COLLOIDAL CERIUM OXIDE, for example.
Mixtures of these pigments may also be used.
Coated or uncoated titanium oxide pigments are particularly preferred for use in the present invention.
In accordance with the invention, the quantity of nanopigments used for protecting the mechanical properties of hair against attack by light is preferably between 0.2 and 2% by weight, contained in a non-rinsed cosmetic support.
In accordance with a preferred embodiment of the invention, these nanopigments are used in a gelled cosmetic support. The following gelling agents can be used: those sold by GOODRICH under the trade name CARBOPOL,
REFERENCES:
patent: 4551330 (1985-11-01), Wagman et al.
patent: 5240695 (1993-08-01), Dubief et al.
Schlossman, M., "Treated Pigments. New Ways to Impart Color on the Skin", Cosmetics & Toiletries, vol. 105, Feb. 1990, pp. 53-64.
Patent Abstracts of Japan, vol. 13, No. 461, Oct. 18, 1989.
Patent Abstracts of Japan, vol. 13, No. 336, Jul. 27, 1989.
Griebler, W., "Titandioxid--ein anorganischer Rohstoff in der Kosmetik", Seifin, Ole, Fette, Wachse, vol. 113, No. 20, Dec. 10, 1987, pp. 765-771.
Dubief Claude
Dupuis Christine
"L'Oreal"
Swiatek Robert P.
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