Clear hair treatment composition

Details Clear hair treatment composition Clear hair treatment composition

2000-10-18

2003-03-04

Page, Thurman K. (Department: 1615)

Drug, bio-affecting and body treating compositions

Live hair or scalp treating compositions

C424S070110, C424S070120

Reexamination Certificate

active

06528046

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The object of the invention is a hair-treating agent useable particularly as leave-in hair-care agent or a hair rinse, preferably in the form of an optically clear product containing hydrophilic silicones and certain associative thickeners as well as, optionally, cationic hair-care substances.
2. Prior Art
As a rule, conventional hair-conditioning preparations, such as rinse-off or leave-on hair-care treatments are formulated on the basis of aqueous emulsions. Essential ingredients are cationic substances such as, for example, cationic surfactants, hydrophobic substances such as, for example, fatty alcohols and other oil components, emulsifiers and other specific agents and odorants. The most important ingredients are the cationic surfactants, fatty alcohols and emulsifiers. An overview of the formulation principles for hair-care rinses and hair-care agents can be found in Schrader, “Grundlagen und Rezepturen der Kosmetika” [Fundamentals and Formulations of Cosmetics], 2nd edition, 1989, pages 728 to 737. The main functions of conditioners are to provide an improvement in stylability, combability, gloss and feel of the treated hair. The treated hair often has a heavier and denser feel which is not always desirable. In addition, currently used oil-in-water [O/W] hair-care emulsions are normally milky-white and opaque. Desirable are products that are in an optically more attractive form and are clear, trans-parent or at least translucent. Various forms of clear hair-care agents are known and are described, for example, in E. Flick, “Cosmetic and Toiletry Formulations”, 2nd edition, volume 2, pages 373 ff. These clear hair-care agents are based on polymers with a thickening action such as, for example, cellulose derivatives (tradenames Natrosol® and Methocel®), high-molecular-weight chitosan derivatives (tradename Kytamer® PC), complex polysaccharides (known as karaya gum and tragacanth or under the tradenames Jaguar® and Keltrol®) and acrylic acid polymers. All these described clear hair-care agents have the major drawback that the care effect is so weak that it does not even approach the effects of a conventional hair-care agent based on mixtures of fatty alcohols and quaternary surfactants. Hence, commercial sales of these clear hair-care agents known from the prior art are much lower than those of standard treatments.
SUMMARY OF THE INVENTION
Our objective was therefore to provide an agent meeting the typical conditioning requirements placed on hair conditioners and which at the same time is in an optically attractive form and confers to the hair less heaviness and a less dense feel than those resulting from a conventional hair-care agent.
We have now found that this objective can be met by use of a hair-treating agent having the composition described in the following. The object of the invention is a hair-treating agent containing
(A) at least one hair-care silicone compound containing at least one hydrophilic group and
(B) at least one nonionic, amphiphilic associative thickener in an appropriate cosmetic base.
Preferably, the agent according to the invention contains additionally a hair-care substance (C) containing at least one cationic group.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The agent meets very well the conditioning requirements placed on hair conditioners. After the treatment, the hair is noticeably smoother in both the wet and the dry state, and wet combability is markedly improved. Surprisingly, we have found that the thickener makes it possible to incorporate cationic substances and the said silicone compounds without the negative secondary properties of the thickener manifesting themselves. The technical properties of the agent according to the invention even exceed the properties of a conventional hair-care agent based on an aqueous emulsion of fatty alcohols and quaternary surfactants. Comparative tests carried out in hairdresser salons side-by-side on two halves of the scalp confirmed the better combability and natural hair feel conferred by the agent of the invention. The agent of the invention practically eliminated the negative, dull hair appearance imparted by fatty alcohol/cationic surfactant mixtures. The hair felt lighter and less dense. Moreover, the combination according to the invention makes it possible to prepare the agent in an optically attractive, clear formulation which in turn permits advantageous packaging in a transparent container, for example one made of glass or transparent plastic, for example polyethylene, polypropylene or polyethylene terephthalate.
The cationic substance (C) is contained in the agent according to the invention preferably in an amount from 0.01 to 10 wt % and particularly from 0.1 to 5 wt %, and it differs from silicone compounds (A) in that it contains no silicone units. The agent contains silicone compound (A) preferably in an amount from 0.01 to 10 wt % and particularly from 0.1 to 5 wt %, and the associative thickener (B) preferably in an amount from 0.1 to 5 wt % and particularly from 0.1 to 2 wt %.
The cationic substance (C) is a material which because of cationic or cationizable groups, particularly primary, secondary, tertiary or quaternary amino groups, exhibits substantivity to human hair. Suitable cationic substances are selected from among cationic surfactants, betaine-type surfactants, amphoteric surfactants, cationic polymers with cationic or cationizable groups, cationically derivatized proteins, cationically derivatized protein hydrolyzates and betaine.
Suitable cationic surfactants are surfactants containing a quaternary ammonium group. These surfactants can be of the cationic or of the amphoteric betaine type. Particularly preferred as cationic substance (C) are cationic surfactants. Suitable cationic surfactants contain amino groups or quaternized hydrophilic ammonium groups which in solution bear a positive charge and can be represented by general formula (I)
N
(+)
R
1
R
2
R
3
R
4
X
(−)
  (I)
wherein R
1
to R
4
independently of each other denote aliphatic, aromatic, alkoxy, polyoxyalkylene, alkylamido, hydroxyalkyl, aryl or alkaryl groups with 1 to 22 carbon atoms, and X
(−)
stands for an anion, for example a halogen, acetate, phosphate, nitrate or alkylsulfate, and preferably a chloride. Besides the carbon atoms and hydrogen atoms, the aliphatic groups can also contain linking groups or other groups, for example hydroxyl or additional amino groups.
Examples of suitable cationic surfactants are the chlorides or bromides of alkyldimethylbenzylammonium salts, alkyltrimethylammonium salts, for example cetyltrimethylammonium chloride or bromide, tetradecyltrimethylammonium chlorides or bromides, alkyldimethylhydroxyethylammonium chlorides or bromides, dialkyldimethylammonium chlorides or bromides, alkylpyridinium salts, for example laurylpyridinium or cetylpyridinium chloride, alkylamidoethyl trimethylammonium ether sulfates, as well as compounds with a cationic character, such as amine oxides, for example alkylmethyl-amine oxides or alkylaminoethyidimethylamine oxides. Particularly preferred is cetyltrimethylammonium chloride which, for example in the form of a 26% aqueous solution, is marketed by Henkel KGaA, Düsseldorf, Germany, under the tradename Dehyquart®, by Hoechst AG, Frankfurt, Germany, under the tradename Genamin® CTAC, and in the form of a 50% solution in isopropanol by Akzo Chemicals GmbH, Düren, Germany, under the tradename Arquat® 16-50.
Suitable amphoteric surfactants are the derivatives of aliphatic quaternary ammonium, phosphonium and sulfonium compounds having formula (II)
wherein R
6
denotes a straight-chain or branched alkyl, alkenyl or hydroxyalkyl group with 8 to 18 carbon atoms, 0 to about 10 ethylene oxide units and 0 to 1 glycerol unit; Y denotes an N—, P— or S— containing group; R
6
denotes an alkyl or monohydroxyalkyl group with 1 to 3 carbon atoms; x equals 1 when Y is a sulfur atom and it equals 2 when Y is a nitrogen or phosphorus atom; R
7
denotes an alkylen

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