Patent Publication Number: US-5154919-A

Title: Depilatory composition

Description:
This application is a continuation of Ser. No. 07/348,621 filed as PCT/FR88/00328 on Jun. 21, 1988 now abandoned. 
    
    
     The present invention relates to a new depilatory composition, its mode of preparation and its use. 
     BACKGROUND OF THE INVENTION 
     At the present time, compositions generally called &#34;waxes&#34; are used for depilation purposes, based on resins either pure or modified, mixed with fat products such as: bees-wax, mineral wax, oil, lanolin, etc . . . 
     These compositions are applied on the skin in the hot state as a relatively thick layer, and are reusable after filtration. The thickness of the layer allows the wax not to cool down too rapidly and therefore to retain a certain degree of flexibility, since below a certain temperature (25°/30°), the wax becomes completely hard and brittle and is therefore unusable in that state. 
     One uses also other compositions, generally called lukewarm waxes, based on resin or modified resin, or on a synthetic resin, fat products, and other products such as glucose, honey, etc. 
     This type of wax called a disposable wax, is applied in a thin layer and is removed with the assistance of a cellulose material strip, notably a &#34;cellophane&#34; band or a nonwoven, film. 
     On the other hand, the present applicant has proposed (see European patent number 86 400 311 published under number 0 194 181) a new depilatory composition, called &#34;low temperature&#34; and &#34;disposable&#34;, meaning that it is not intended to be reused after filtration, with its main constituent being a resin salt, and notably a triethanolamine resinate, which is also applied in a very thin layer and is removed with the assistance of a strip of cellulose film, and notably of &#34;cellophane&#34;. 
     SUMMARY OF THE INVENTION 
     The present invention aims at providing a new generation of depilatory compositions, more easily used than the depilatory compositions presently available. 
     To this effect, the invention relates to a new depilatory composition or &#34;depilatory wax&#34; of the &#34;low temperature&#34; and &#34;disposable&#34; type, characterized by the fact that: 
     1) it contains a main constituent an elastomeric and/or thermoplastic macro-molecular compound, allowing a control of the resiliency of the composition at room temperature and without this wax breaking into pieces due to the homogeneity imparted to the mixture; 
     2) there is added to this main constituent: 
     a natural or modified resin imparting tackniness to the product; 
     softeners and sweeteners such as, for example, fats (lanolin, talloil), natural or synthetic waxes (bees-wax, paraffin, micro-crystalline wax, etc.), oils (colzaseed oil, litmus oil, corn oil, vaseline oil, etc.) and 
     possibly fillers (calcium carbonate or titanium dioxide), 
     whereby this depilatory wax can be deposited in a thin layer, in contrast to hot waxes which are deposited in a relatively thick layer, or to the so-called disposable lukewarm waxes which have to be used with a strip of &#34;cellophane&#34;. 
     Amongst the elastomers which can be used as an essential constituent of the depilatory composition according to the present invention, one may cite notably (of course this list having by no way any limiting character): 
     natural rubber, and synthetic elastomers chosen notably in the groups including: 
     the copolymers or terpolymers of ethylene-propylene; 
     the styrene-butadiene copolymers; 
     the vinyl ethylene-acetate copolymers; 
     the acrylic polymers; 
     the butadiene, isoprene, isoprene-isobutene, isobutene, chloroprene elastomers; 
     the nitrile rubbers; 
     the polyester thermoplastic elastomers. 
     According to a preferred but not limiting way of providing a depilatory wax according to the invention, said wax has the following composition: 
     
         ______________________________________                                    
Elastomer            5 to 15% by weight                                   
Resin and modified resin                                                  
                    40 to 80% by weight                                   
Softener (wax or oil)                                                     
                    10 to 20% by weight                                   
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     The composition can also include fillers such as notably calcium carbonate or titanium dioxide in a proportion of the order of 5 to 15%. 
    
    
     According to the invention, the hereabove depilatory composition, once it has been previously slightly heated, becomes an unctuous liquid of which a small quantity is taken by using a spatula so as to apply it in the direction of the hairs in the form of strips having dimensions varying according to the part to be depilated. These strips have the property of being applied in a thin and regular layer on the skin. 
     One can also apply the wax by using a distributing apparatus, heated or not, and provided with a tank adapted to contain wax. The compound is left on the skin for a few moments to &#34;set&#34; so that the thin layer gives rise, through lymerization, to a thin plastic film which catches the hairs without adhering to the skin, since the strip has lost its tackiness, in its outer surface on top and underneath. Thereafter, it is enough to peel away the thin film in order to pull out the hairs captured in the band. 
     It is possible, by replacing in the hereabove mentioned formula the resins by some types of liquid resins, to use the depilatory product according to the invention at room temperature without having to previously heat it. However, this product has to be kept sheltered from the air when stored. 
     The following example is given without any limiting character a mode of preparation of a depilatory composition according to the present invention. 
     One begins by melting the chosen elastomer at a temperature between 90° and 160° C., as a function of the nature of said elastomer. There is then added to the product thus obtained all the other hereabove mentioned components, while maintaining the temperature of the mixture at a minimum of more or less 100° C. Since the elastomer is not a soluble product, it is necessary to provide a depilatory product of great homogeneity to mix it for a certain duration in an appropriate stirrer. 
     Of course, this invention is not limited to the hereabove described embodiments and it encompasses all the variants thereof.