Use of finely divided dye-containing polymers PD as...

Details Use of finely divided dye-containing polymers PD as... Use of finely divided dye-containing polymers PD as...

2000-10-03

2003-04-01

Page, Thurman K. (Department: 1615)

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Matrices

C424S401000, C424S486000, C424S487000, C424S070100, C424S059000, C424S063000, C424S064000, C514S937000, C514S844000

Reexamination Certificate

active

06541032

ABSTRACT:

The present invention relates to the use of finely divided dye-containing polymers PD as color-imparting constituent in cosmetic compositions.
Cosmetic compositions are generally used to protect the skin, in particular facial skin, hair, fingernails and toenails from mechanical effects, from drying out and from infections. In the case of a number of cosmetic compositions the intention is for an optical effect to also be achieved in addition to the care and protecting action. Sometimes, the optical effect is even of primary importance. Examples of cosmetic compositions with which an optical effect is to be achieved are compositions for treating facial skin, such as kohl pencils, eyeliners, eye shadows, foundation formulations, tinting creams, stage make-up, hair-treatment compositions, such as wet gels, hair gels with glimmer look, styling gels, hair spray, hair mascara, and also nail varnishes and sunscreen formulations, such as sunblock creams and sunblock sticks. Cosmetics for which the optical effect is of primary importance are frequently also referred to as decorative cosmetics.
Decorative cosmetics generally comprise organic or inorganic pigments as color-imparting constituent. These are usually incorporated into the cosmetics during their preparation. Because of their insolubility, the pigments behave largely inertly toward the other constituents of the cosmetic composition, in contrasst to soluble dyes. In addition, the insolubility of the pigments has the advantage that lasting coloration of the parts of the body which have been treated with the cosmetic composition can be avoided.
A disadvantage of using pigments is that their color brilliance is lower than that of organic dyes. In addition, traditional pigments have to be digested prior to their use in cosmetic compositions in order to ensure fine distribution of the pigment within the cosmetic composition. Fine dispersion of the pigment is necessary in order to guarantee uniform coloration of the cosmetic composition and to achieve adequate depth of color even where relatively small amounts of pigment are used. To digest the pigment, the pigment is usually ground in some of the oily phase to give a pigment-containing paste, which is then rolled or milled to give the desired degree of fineness. In this connection, it is important that the color paste is not too thin so that a good grinding effect is achieved. It must, however, not be too solid either since otherwise the color paste cannot be incorporated into the cosmetic composition without lumps.
It is an object of the present invention to provide a color-imparting constituent suitable for cosmetic compositions which can be readily incorporated into the cosmetic compositions and at the same time has the advantages of pigments, namely chemically inert behavior toward the other constituents of the cosmetic composition and a low solubility in water. In addition, the color-imparting constituent should have a color brilliance which is increased compared with inorganic or organic pigments.
We have now found, surprisingly, that this object is achieved by finely divided dye-containing polymers PD, the polymer matrix of which comprises at least one organic dye D in homogeneously dispersed form. The finely divided polymers PD are used here in the form of their aqueous polymer dispersion or in the form of a polymer powder prepared therefrom.
Accordingly, the present invention relates to the use of finely divided dye-containing polymers PD in the form of an aqueous polymer dispersion or a polymer powder obtainable therefrom, the polymer matrix of which comprises at least one organic dye in homogeneously dispersed form, as color-imparting constituent in cosmetic compositions.
Homogeneous dispersion of the organic dye means that the organic dye in the polymer matrix of the dye-containing polymer is present in molecularly disperse distribution, i.e. is present in monomolecularly dissolved form or dissolved in the form of bi- or higher-molecular dye aggregates.
The term dye encompasses here and below chemical compounds or salts of chemical compounds, and charge-transfer complexes of chemical compounds having a chromophore which has an absorption maximum in the wavelength range from 400 to 850 nm and thus brings about a color impression for the human eye (conventional dyes), and which itself optionally also emits light in the visible region (fluorescent dyes). Dyes for the purposes of this invention are also compounds having an absorption maximum in the range from 250 to 400 nm which emit fluorescent radiation in the visible region upon irradiation with UV light (optical brightener). Dyes for the purposes of this invention are also chemical compounds which absorb light of wavelength <400 nm and deactivate it in a nonradiative manner (UV stabilizers resp. UV absorbers).
It is an essential feature of the invention that the dye can be homogeneously dispersed in the polymer matrix of the dye-containing polymer. This is usually ensured when the organic dye, optionally in the form of a salt, has at least limited solubility in the low molecular weight constituents which form the polymer matrix (monomers). The organic dye preferably has a solubility which is greater than the intended use amount in the polymer. Suitable dyes D have, in particular, a solubility of >0.5% by weight, in particular >1% by weight and very particularly preferably >5% by weight in the monomers.
Depending on the color intensity of the dye, the dye-containing polymer PD generally comprises at least 0.1% by weight, based on the weight of the polymer matrix, preferably 0.5 to 50% by weight, in particular 1 to 30% by weight and especially preferably 5 to 30% by weight, of at least one organic dye D.
The monomer-soluble dyes D generally do not have ionic functional groups. The dye chromophore will have one or more substituents which improve the solubility of the dyes in the nonpolar or slightly polar monomers. Suitable substituents are, for example, C
1
-C
10
-alkyl, which may optionally be interrupted by heteroatoms and/or substituted by hydroxyl and/or halogen, C
1
-C
10
-alkoxy, amino, C
1
-C
10
-alkylamino, bis-C
1
-C
10
-dialkylamino, C
1
-C
10
-alkylaminocarbonyl, C
1
-C
10
-alkyloxycarbonyl, C
1
-C
10
-alkylcarbonylamino, C
1
-C
10
-alkylcarbonyloxy, C
6
-C
10
-aryl, C
6
-C
10
-aryloxy, C
6
-C
10
-arylcarbonyl, C
6
-C
10
-arylcarbonyloxy, C
6
-C
10
-arylamino, C
6
-C
10
-arylcarbonylamino, C
6
-C
10
-aryloxycarbonyl, C
6
-C
10
-arylaminocarbonyl, C
6
-C
10
-aryl-C
1
-C
4
-alkyl, heterocyclyl, halogen and nitro.
C
1
-C
10
-Alkyl means here and below both linear or branched alkyl having 1 to 10 carbon atoms which may be interrupted by one or more nonadjacent oxygen atoms, sulfur atoms, imino groups or alkylimino groups, and/or may be mono- or polysubstituted by halogen or hydroxyl. Examples of unsubstituted alkyl groups include methyl, ethyl, n-propyl, isopropyl, n-butyl, 2-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl, tert-pentyl, hexyl, 2-methylpentyl, heptyl, 1-ethylpentyl, n-octyl, 2-ethylhexyl, isooctyl, nonyl, isononyl, decyl, isodecyl, undecyl, dodecyl, tridecyl, isotridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl. Examples of alkyl groups interrupted by oxygen include 2-methoxyethyl, 2-ethoxyethyl, 2-propoxyethyl, 2-isopropoxyethyl, 2-butoxyethyl, 2- or 3-methoxypropyl, 2- or 3-ethoxypropyl, 2- or 3-propoxypropyl, 2- or 3-isopropoxypropyl, 2- or 3-butoxypropyl, 2- or 3-(2-ethylhexyloxypropyl) etc. Halogen-substituted alkyl groups include, in particular, perfluoroalkyl groups having 1 to 4 carbon atoms, such as trifluoromethyl. Examples of hydroxyl-substituted alkyl groups are hydroxymethyl, 1- or 2-hydroxyethyl, 1-, 2- or 3-hydroxypropyl, 1,2-bishydroxyethyl.
C
6
-C
10
-Aryl means phenyl or naphthyl which is optionally substituted by 1, 2 or 3 substituents chosen from C
1
-C
4
-alkyl, C
1
-C
4
-alkoxy, halogen, hydroxyl, which can optionally also be ethoxylated. C
6
-C
10
-Aryl-C
1
-C
4
-alkyl stands for C
6
-C
10
-aryl bonded by a C
1
-C
4
-

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