Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing
Reexamination Certificate
2001-03-05
2003-03-18
Kopec, Mark (Department: 1751)
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing involving animal-derived natural fiber material ,...
Hair dyeing
C008S405000, C008S406000, C008S409000, C008S455000, C008S557000, C424S047000, C424S061000, C424S070210, C424S078050, C424S085100, C524S401000, C526S271000, C526S216000, C526S332000, C526S336000, C526S272000
Reexamination Certificate
active
06533823
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a dye composition for keratinous fibers, which exhibits a stable and appropriate viscosity in a wide pH range and even in a system containing a salt or solvent at a high concentration, is excellent in usability and dyeing properties and is particularly suited for use with an acid dye.
2. Description of the Related Art
It is the common practice to incorporate, in a dye composition for keratinous fibers such as hair dye, a thickener with a view toward preventing liquid dripping, thereby improving handling use of it or improving retention of the dye in keratinous fibers. As such a thickener, natural polymers such as xanthan gum and guar gum, and semi-synthetic polymers such as methyl cellulose and hydroxyethyl cellulose are employed by way of example.
In a dye composition, an acid dye, basic dye, oxidation dye or the like is contained as a dye. Suitable pH conditions are necessary for effective staining of keratinous fibers with this dye. For example, keratinous fibers are dyed well with an acid dye at a pH in the vicinity of 1.5 to 5, and with an oxidation dye at a pH in the vicinity of 6 to 10. Thus, it is necessary to adjust the pH to fall within a wide range, depending on the kind of a dye.
In general, however, a thickener exhibits good thickening effects within a limited pH range and many thickeners lack in stability at a low pH. Xanthan gum or the like is known as a thickener rather free from the influence of pH. Xanthan gum was however accompanied with the problems that owing to insufficient fluidity of a dye composition containing it, the composition dripped as a mass when applied to the hair by hands or some tool. In addition, the dye composition containing xanthan gum involved problems in usability, that is, low spreadability over the hair and in dyeing properties. Thus, a dye composition containing an acid dye conventionally used within a particularly low pH range was not sufficient in usability and dyeing properties.
An object of the present invention is therefore to provide a dye composition for keratinous fibers which composition exhibits a stable and appropriate viscosity in a wide pH range and even in a system containing a salt or solvent at a high concentration, and is excellent in usability and dyeing properties.
SUMMARY OF THE INVENTION
The present inventors have found that a dye composition for keratinous fibers which can satisfy the above-described object is available by incorporating therein a specific anionic partially crosslinked polymer.
In the present invention, there is thus provided a dye composition for keratinous fibers, which comprises the following components (A) and (B):
(A) a hydrolyzate of a lower alkyl vinyl ether/maleic anhydride copolymer partially crosslinked with a terminally unsaturated diene compound, or a monoalkyl ester of the hydrolyzate; and
(B) a dye.
The dye composition for keratinous fibers according to the present invention has a stable and appropriate viscosity in a wide pH range and even in a system containing a salt or solvent at a high concentration; and has excellent usability and dyeing properties. It is particularly suited for use with an acid dye.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The lower alkyl vinyl ether/maleic anhydride copolymer partially crosslinked by a terminally unsaturated diene compound (which copolymer will hereinafter be called “partially crosslinked polymer”, simply), one of the components to be used in the present invention, is as described in U.S. Pat. No. 5,539,039 and U.S. Pat. No. 5,874,510. By the hydrolysis of it, the hetero ring of maleic anhydride becomes a dicarboxylic acid, whereby a colorless transparent gel is formed.
Examples of the lower alkyl group of the lower alkyl vinyl ether to be used for the partially crosslinked polymer include C
1-4
alkyl groups. Among them, methyl and ethyl groups are preferred, with methyl group being particularly preferred.
The molar ratio of the lower alkyl vinyl ether to maleic anhydride in the partially crosslinked polymer ranges from 40:60 to 60:40, with a range of from 45:55 to 55:45 being particularly preferred.
Examples of the terminally unsaturated diene compound to be used as a crosslinking agent include C
6-18
compounds such as 1,5-hexadiene, 1,7-octadiene, 1,9-decadiene, 1,11-dodecadiene, 1,15-hexadecadiene, divinylbenzene, ethylene dimethacrylate, methacrylic anhydride and diaryl phthalate. Among them, terminally unsaturated alkadienes are preferred, with 1,9-decadiene being particularly preferred.
The crosslinking degree of the partially crosslinked polymer by the above-described crosslinking agent is preferred to be 1 to 5%, especially 2 to 4% and its average molecular weight is preferably at least 1000,000.
Such a partially crosslinked polymer is available as a uniform suspension by polymerizing a lower alkyl vinyl ether and maleic anhydride in a proper solvent in the presence of a crosslinking agent (a terminal unsaturated diene compound) and a polymerization initiator at 60 to 80° C. As the solvent and polymerization initiator, isopropyl acetate an the like, and 2,2′-azobis (2-methylbutanenitrile), decanoyl peroxide and the like can be used, respectively.
As the partially crosslinked polymer, commercially available products can also be employed. Examples include “Stabileze 06” and “Stabileze QM” (each, trade name; product of ISP Inc.), that is, a methyl vinyl ether/maleic anhydride copolymer partially crosslinked with 1,9-decadiene.
As described above, by the hydrolysis to convert the hetero ring of maleic anhydride into a dicarboxylic acid, the partially crosslinked polymer forms a colorless transparent gel. This hydrolysis is effected in a manner known per se in the art, for example, by dispersing the polymer in water and then heating. The partially crosslinked polymer wherein the dicarboxylic acid has partially been monoalkyl esterified is also usable and in this case, C
1-4
alkyl groups are preferred as the alkyl group. Esterification can be conducted, for example, by reacting the partially crosslinked polymer with a lower alcohol corresponding to the alkyl group in a solvent such as acetone. A desired viscosity is available by neutralizing the hydrolyzate or monoalkyl ester thereof with an alkali as needed.
Examples of the alkali usable for neutralization include inorganic alkali agents such as sodium hydroxide and potassium hydroxide; organic alkali agents such as monoethanolamine, diethanolamine, triethanolamine and aminopropanol; ammonia: carbonates such as ammonium carbonate, potassium carbonate, sodium carbonate and guanidine carbonate; basic amino acids such as arginine. Among them, alkali metal hydroxides are preferred.
The content of Component (A) in the dye composition for keratinous fibers according to the present invention is preferably 0.1 to 15 wt. %, with 0.5 to 10 wt. % being particularly preferred.
As the dye [Component (B)] to be used in the present invention, preferred are acid dyes, basic dyes, nonionic dyes and oxidation dyes, with acid dyes being particularly preferred.
Examples of the acid dye include Acid Red 27 (C.I. 16185), Acid Red 51 (C.I.45430), Acid Red 18 (C.I. 16255), Acid Red 92 (C.I. 45410), Acid Red 94 (C.I. 45440), Acid Red 52 (C.I. 45100), Acid Yellow 23 (C.I. 19140), Food Yellow 3 (C.I. 15985), Food Green 3 (C.I. 42053), Food Blue 2 (C.I. 42090), Acid Blue 74 (C.I. 73015), Pigment Red 57-1 (C.I. 15850), Acid Red 33 (C.I. 17200), Acid Red 87(1) (C.I. 45380), Acid Red 92 (C.I. 45410), Acid Red 94 (C.I. 45440), Acid Orange 7 (C.I. 15510), Acid Red 95 (C.I. 45425), Acid Yellow 73 (C.I. 45350), Acid Yellow 3 (C.I. 47005), Acid Green 25 (C.I. 61570), Acid Green 5 (C.I. 42095), Acid Blue 5 (C.I. 42052), Acid Blue 9 (C.I. 42090), Acid Orange 24 (C.I. 20170), Acid Violet 9 (C.I. 45190), Food Red 6 (C.I. 16155), Acid Red 26 (C.I. 16150), Food Red 1 (C.I. 14700), Acid Red 88 (C.I. 15620), Acid Orange 20 (C.I. 14600), Acid Yellow 40 (C.I. 18950), Acid Yellow 1 (C.I. 10316), Acid Yellow 36 (C.I. 130
Fukuhara Masaki
Nakashimada Atsushi
Elhilo Eisa
KAO Corporation
Kopec Mark
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