Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Matrices
Reexamination Certificate
2002-08-27
2004-04-06
Ramsuez, Robert W. (Department: 1626)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Matrices
C424S070160, C424S078180, C514S844000, C514S944000
Reexamination Certificate
active
06716455
ABSTRACT:
BACKGROUND OF THE INVENTION
The subject matter of the invention is a hair treatment composition in gel form, which has special predetermined rheological properties and contains a combination of an itaconic acid monoester/acrylate copolymer and a hair-fixing film-forming polymer.
Hair gels are used for holding and fixing human hair. Conventional hair gels usually contain a combination of gel formers and hair-fixing polymers. The cosmetic hair-fixing polymers usually used for this purpose are characterized by good fixing properties, which more or less satisfactorily hold and fix the hair in a predetermined shape, in aqueous, alcoholic or aqueous-alcoholic media. Frequently however the hair is provided with an only unsatisfactory luster by application of these hair-fixing polymers. Of course a series of additives are known, which are in a position to improve the hair luster, e.g. hydrophobic materials, such as liquid paraffins, isoparaffins, silicone oils or hydrophilic materials, such as multivalent alcohols, especially glycerol or polypropylene glycol. These known, luster-improving materials frequently disadvantageously influence other desired properties of the hair gel. They can act as softeners for the fixing polymer used and thus reduce its fixing power. They can impair the clarity and transparency of the gel, the rheological properties and correspondingly the application properties. Alternatively they still do not provide sufficient hair luster.
An additional important property of hair gel is its rheological behavior. Gels, on the one hand, have high viscosity, and, on the other hand, have the properties of non-Newtonian liquids, especially the properties of pseudo-plastic liquids with or without a flow limit. The viscosity decreases with increasing shear rate (shear thinning). The flow curve is non-linear, i.e. the ratio of the shear stress or shearing force to the shear rate is not constant. This is observable in practice because a gel with these properties has a comparatively high viscosity in the resting phase and/or plastic behavior, but flows readily on application of a comparatively small force and thus is easily removed from its container and easily distributed over the hair. Typically and frequently used gel formers, which form gels having a viscosity that decreases under pressure, are neutralized carbomers (polyacrylic acid).
The viscosity decrease of conventional hair gels caused by shear stress due to their own weight is a disadvantage of these conventional hair gels. Because of that decrease the hair gels can flow. Then the composition can drip from an opened tube containing it, even without an externally applied pressure. Also it can run off vertical or inclined skin or hair surfaces after manual application and, in the case of a gel with thixotropic behavior, even with an increased speed. Undesired dripping or run off of course can be naturally avoided by increasing the base viscosity. However at the same time the application properties, e.g. the distributability and workability of the composition into the hair, are impaired and greater amounts of gel formers are required, which can lead to increased product costs and to increased load on the hair.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a hair treatment gel of the above-described type, which avoids the disadvantages of the prior art hair treatment gels.
It is a further object of the present invention to provide a hair treatment gel, which provides good hair fixing but at the same time optimizes hair luster, avoids the rheological disadvantages of conventional hair gels and has more attractive, more pleasing haptic properties.
It has now been found that these objects can be attained with a hair treatment gel on an aqueous basis, which has a viscosity of at least 1000 mPa.s at 25° C., a pH of greater than 7 and which contains the following combination of ingredients:
(A) at least 0.5 percent by weight of at least one copolymer of a first monomer and a second monomer, wherein the first monomer is an itaconic acid monoester of the formula CH
2
═C(COOR
1
)CH
2
COOR
2
, wherein one of R
1
and R
2
represents hydrogen and the other of R
1
and R
2
represents the group —(CH
2
CH
2
O)
x
—R
3
, x is a number between 1 to 100 and R
3
is an alkyl group with 8 to 30 carbon atoms, and the second monomer is an acrylate monomer; and
(B) at least one non-ionic, anionic, zwitterionic or amphoteric hair-fixing polymer;
but which does not contain a combination of an acrylate/Ceteth-20-itaconate copolymer, cellulose acetate phthalate and HO—(CH
2
CH
2
O)
75
—(CH(CH
3
)CH
2
O)
30
—(CH
2
CH
2
O)
75
—H.
The copolymer (A) is preferably present in an amount of from 0.5 to 20, preferably from 1.5 to 10, percent by weight and the hair-fixing polymer (B) is present preferably in an amount of 0.1 to 15, preferably from 0.5 to 10, percent by weight. The hair gel according to the invention is preferably essentially free of cationic polymers, i.e. it contains either no cationic polymers or less than 0.02 percent by weight of cationic polymers. The hair gel according to the invention provides good hair fixing and an improved hair luster at the same time as improved flow properties and an especially pleasant appearance.
It has now been found that these objects may also be attained with a hair treatment gel on an aqueous basis, which has a viscosity of at least 1000 mPa.s at 25° C., a pH of greater than 7 and which contains the following combination of ingredients:
(a) an acrylate/Ceteth-20-itaconate copolymer,
(b) cellulose acetate phthalate, and
(c) HO—(CH
2
CH
2
O)
75
—(CH(CH
3
)CH
2
O)
30
—(CH
2
CH
2
O)
75
—H.
The term “alkyl” in the present disclosure means “monovalent hydrocarbon groups”, which can be linear, branched or cyclic.
Copolymer (A)
The copolymer (A) is built up from itaconic acid monoesters of the general formula CH
2
═C(COOR
1
)CH
2
COOR
2
, wherein one of R
1
and R
2
represents hydrogen and the other of R
1
and R
2
represents the group —(CH
2
CH
2
O)
x
—R
3
, x is a number between 1 to 100, preferably from 10 to 40, especially preferably 20. R
3
is an alkyl group with 8 to 30, preferably 12 to 20, carbon atoms, especially cetyl or stearyl are preferred.
The acrylate monomers of the copolymer (A) are preferably selected from the group consisting of acrylic acid, methacrylic acid and their esters, especially the acrylic acid alkyl esters and methacrylic acid alkyl esters with one to ten, especially 1 to 4, carbon atoms in the alkyl group. Suitable copolymers are, for example, acrylic acid or methacrylic acid/itaconic acid polyethoxyalkyl ester copolymers (INCI name:acrylates/Steareth-20 itaconate copolymer and acrylates/Ceteth-20 itaconate copolymer), such as marketed by the firm National Starch, U.S.A. under the trademark Structure® 2001 and Structure® 3001. The acid groups in the polymers used are preferably neutralized by organic or inorganic bases to the extent of 50 to 100%. Suitable neutralization agents are primary or secondary amines, especially aminoalkanols with preferably from 1 to 10 carbon atoms and 1 to 3 hydroxy groups, such as e.g. aminomethyl propanol (AMP), triethanol amine, tetrahydroxypropylethylenediamine or monoethanolamine, but also ammonia, sodium hydroxide, potassium hydroxide, among others.
Hair-Fixing Polymer (B)
The hair-fixing polymer (B) can be non-ionic, anionic, zwitterionic or amphoteric, however preferably anionic or nonionic. It can be a synthetic or natural polymer. The term “natural polymer” means any polymer of natural origin or any polymer of natural origin that has been chemically modified. Those polymers are particularly preferred, which have sufficient solubility in water, alcohol or alcohol/water mixtures, in order to be present in completely dissolved form in the compositions according to the invention. “Hair-fixing polymers” are understood to be those polymers, which, when used in an amount of from 0.01 to 5% in an aqueous, alcoholic or aqueous-alcoholic solution or dispersion, are in a position to deposit a polymer film on the
Birkel Susanne
Franzke Michael
Niesig Silke
Wendel Harald
Ramsuez Robert W.
Sackey Ebenezer
Striker Michael J.
Wella Aktiengesellschaft
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