Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1998-12-08
2001-11-06
Kishore, Gollamudi S. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S064000, C424S070100, C514S944000
Reexamination Certificate
active
06312702
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a solid composition useful for topical application, as well as to its use in the cosmetic and/or dermatological fields, in particular to care for and/or treat the skin, the scalp, the hair or mucous membranes, to make up the skin and/or keratin fibres such as the eyelashes and the hair, and to style and/or shape keratin fibres, and in particular the hair.
2. Discussion of the Background
Products in solid form are known in the cosmetics industry. Products of this type include, in the field of make-up, tubes or “sticks” of lipstick, foundation or of eyeshadow; in the field of skin care or lip care, lip, repair pencils and depigmenting, make-up-removing or moisturizing tubes or “sticks”; in the field of hygiene, deodorant sticks and moussing sticks or bars to shave or wash the skin.
Wax-based stick formulations have certain drawbacks: they have a greasy nature which is not appreciated by users, and they lack freshness when applied. In addition, it is difficult to introduce hydrophilic active agents therein.
Moreover, non-greasy sticks such as deodorant sticks generally contain a relatively large amount of fatty acid salts which can have an irritant nature for applications such as facial care. Moreover, these sticks leave a sticky film when applied to the skin.
In addition, aqueous rigid gels are described in documents WO-A-97/17055 and WO-A-97/17053. However, these gels require the use of a fairly large concentration of gelling agent or use a specific preparation technique—extrusion. In addition, the sticks described in document WO-A-97/17055 lack transparency and, on account of the high concentration of gelling agent, lack freshness and softness when applied to the skin, and those described in document WO-A-97/17053 must be moistened at the time of use.
Moreover, document EP-A-803,245 describes aqueous solid compositions containing heat-reversible polysaccharides, a wetting agent and a powdery phase (fillers). However, the presence of a powdery phase can entail the following drawbacks: presence of a visible trace after applying the composition to the skin and reduced feeling of comfort. In addition, when the powdery phase is removed from the composition described in document EP-A-803,245, a composition which is neither sufficiently solid nor sufficiently stable and which does not transfer onto the skin in a satisfactory manner is obtained.
Thus, there is still a need for a solid composition for topical application which does not have the drawbacks of the prior art.
DETAILED DESCRIPTION OF THE INVENTION
The inventors have discovered, unexpectedly, a specific hydrophilic gelling system which makes it possible to prepare homogeneous, rigid aqueous compositions which are stable even at low gelling agent contents and even in the absence of fillers, and which do not require the use of a specific preparation technique. The compositions obtained can contain a large amount of water and thus have a sensation of freshness when applied while at the same time giving an impression of softness. In addition, they allow product to be applied directly to the skin without the need for prior moistening and without leaving a visible powdery deposit on the skin.
The subject of the present invention is a solid composition free of fillers (see below), containing, in an aqueous phase, less than 20% of the total weight of the composition of a hydrophilic gelling system comprising the combination of at least 2% by weight of kappa-carrageena, relative to the total weight of the composition, and at least one hydrocolloid chosen from xanthan gum and cellulose derivatives which are soluble in hot water.
The term “free of fillers” means that the composition contains no insoluble dyes or pigments or powders. The composition of the invention is, in particular, free of powders such as talc, starch, acrylate polymer and copolymer, mica, kaolin, polyamide (nylon), polyethylene, silica and silicone powders.
Moreover, the term “hydrocolloid” means a water-soluble macromolecule which does not modify the water activity value of the composition containing it.
In addition, the term solid composition means any composition with a compression strength of greater than or equal to 20 grams, at room temperature (20-25° C.), after penetration by an axisymmetrical probe with a diameter of 0.8 cm into the matrix of the composition to a depth of 1 mm at a speed of 0.5 mm/s and removal of the said probe from the matrix of the composition at a speed of 0.5 mm/s; the compression strength is measured with an analyser such as the “LFRA texture analyser” sold by the company Stevens/Mechtric.
The solid composition obtained can be applied directly to a support, i.e. it does not need to be moistened in order to be applied to the support, and in particular to the skin or hair. The term “support” for the composition according to the invention means any surface on which a topical application may be made, in particular the skin, keratin fibres such as the eyelashes and the hair, the scalp and mucous membranes such as the lips.
In addition, unlike solid compositions containing a high proportion of gelling agents, the composition of the invention has the advantage of not leaving a visible powdery deposit when it is applied to a support. Moreover, it has the property of being transparent or translucent in the absence of oil.
The kappa-carrageenan, preferably used as sole gelling agent, at 2% gives a composition which is indeed solid, but brittle and crumbly and which exhibits syneresis (poor stability over time), and is thus unsuitable for cosmetic or dermatological application. In addition, by increasing the amount of kappa-carrageenan, an opaque composition is obtained which applies poorly to a support such as the skin and exhibits syneresis. The invention combination makes it possible to obtain a solid composition with good properties of both solidity and transfer.
Thus, the solid composition according to the invention has a good transfer property, i.e. when applied to a support, it releases an effective amount of product onto this support.
The kappa-carrageenan used in the composition of the invention can be pure or mixed with another carrageenan such as iota-carrageenan.
The amount of kappa-carrageenan is at least 2% of the total weight of the composition, and it can range, for example, from 2 to 15%, preferably from 2 to 8% and, better still, from 2 to 4%, of the total weight of the composition.
Xanthan gum is know per se.
The hydrocolloid cellulose derivatives which can be used in the composition of the invention must be soluble in hot (80-90° C.) water, since cellulose derivatives which are insoluble in hot water, such as methylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose and hydroxybutylcellulose, lead to heterogeneous compositions which are also sticky and do not deposit any product onto the support onto which they are applied. Such compositions are thus incapable of solving the problem underlying the invention. Thus, the composition of the invention is preferably free from cellulose derivatives which are insoluble in hot water.
Cellulose derivatives which are soluble in hot water (“soluble cellulose derivatives”) and which can be used in the composition of the invention include carboxymethylcellulose, hydroxyethylcellulose and celluloses modified, in particular by grafting an alkyl group. Mixtures may be used. According to a preferred embodiment of the invention, carboxymethylcellulose is used.
The total amount of hydrocolloid present in the invention composition is 2.5-25%, preferably 2.5-10% most preferably, 3-8% based on total weight of composition.
The hydrocolloid(s) combined with the kappa-carrageenan is (are) present in the composition according to the invention in an amount which can vary within a wide range. Thus, this amount can range, for example, from 1 to 10%, preferably from 1 to 5% and, better still, from 2 to 4%, of the total weight of the composition.
Depending on the proportions, and in particular when the total
Quemin Eric
Roulier Veronique
Channavajjala Lakshmi
Kishore Gollamudi S.
L'Oreal
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
LandOfFree
Solid cosmetic composition free of fillers, containing low... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Solid cosmetic composition free of fillers, containing low..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solid cosmetic composition free of fillers, containing low... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2585016