Cosmetic composition in the form of a soft paste and process for preparation of same

Abstract

A cosmetic composition which is presented in the form of a soft paste, which is capable of being used as lipstick and comprising a fatty phase in which waxes are present. A process for the preparation of this composition is also disclosed.

What is claimed is:  
     
         1 . A cosmetic composition, in the form of a soft paste, which comprises a fatty phase in which one or more waxes are present, wherein at least 95% of said waxes have a temperature at the onset of melting which is greater than or equal to 50° C.  
     
     
         2 . A composition according to  claim 1 , in which 100% of said waxes have a temperature at the onset of melting which is greater than 50° C.  
     
     
         3 . A composition according to  claim 1 , in which said waxes have a temperature at the onset of melting which is greater than 65° C.  
     
     
         4 . A composition according to  claim 1 , wherein said waxes are selected from Carnauba wax, polyethylene waxes and microcrystalline waxes.  
     
     
         5 . A composition according to  claim 1 , wherein said waxes represent 10-60% by weight of said composition.  
     
     
         6 . A composition according to  claim 5 , wherein said waxes represent 15-35% by weight of said composition.  
     
     
         7 . A composition according to  claim 1 , wherein said fatty phase comprises at least one additional fatty constituent that is an oil.  
     
     
         8 . A composition according to  claim 7 , wherein said at least one additional fatty constituent is selected from paraffin oil, liquid paraffin, perhydrosqualene, arara oil, sweet almond oil, calophyllum oil, palm oil, castor oil, avocado oil, jojoba oil, olive oil, cereal germ oil, esters of lanolic acid, oleic acid, lauric acid, stearic acid and myristic acid, alcohols, acetylglycerides, octanoates, decanoates and ricinoleates of alcohols and of polyalcohols.  
     
     
         9 . A composition according to  claim 8 , wherein said alcohols are selected from oleyl alcohol, linoleyl alcohol, linolenyl alcohol, isostearyl alcohol and octyl dodecanol.  
     
     
         10 . A composition according to  claim 7 , wherein said at least one additional fatty constituent represents 40-90% by weight of the composition.  
     
     
         11 . A composition according to  claim 10 , wherein said at least one additional fatty constituent represents 65-85% by weight of said composition.  
     
     
         12 . A composition according to  claim 1 , further comprising a pulverulent colouring agent selected from carbon black, chromium oxides, iron oxides, ultramarines, manganese pyrophosphate, ferric blue, titanium dioxide, pearlescent agents and organic colorants.  
     
     
         13 . A composition according to  claim 1 , further comprising at least one inorganic or organic pulverulent filler selected from talc, micas, kaolin, zinc oxides, titanium oxides, calcium carbonates, magnesium carbonates, silica, spheric titanium dioxide, glass beads, ceramic beads, metallic soaps derived from carboxylic acids having 8-22 carbon atoms, nonexpanded synthetic polymer powders, expanded powders and powders of natural organic compounds.  
     
     
         14 . A composition according to  claim 13 , wherein said natural organic compounds are cereal starches which may be crosslinked.  
     
     
         15 . A composition according to  claim 1 , which is in the form of a lip make-up or lip treatment product.  
     
     
         16 . A process for preparing a composition in the form of a soft paste, said composition comprising a fatty phase in which one or more waxes are present, wherein at least 95% of said waxes have a temperature at the onset of melting which is greater than or equal to 50° C., which process comprises heating at least a portion of the constituents of said composition, including said waxes, to a temperature at which said waxes melt at least partially, adding the remaining constituents to said composition, and then cooling the resulting mixture, wherein during at least part of said cooling operation the resulting mixture is blended.  
     
     
         17 . A process according to  claim 16 , wherein said blending operation is carried out in a roll mill or in an extruder.  
     
     
         18 . A process according to  claim 16 , wherein said heating, adding or blending operations are carried out in one or more extruders which are arranged successively.  
     
     
         19 . A process according to  claim 16 , wherein said heating, adding, and blending operations are carried out in a single twin-screw extruder.  
     
     
         20 . A method of improving the cosmetic qualities of a cosmetic composition during storage, comprising the step of including in said cosmetic composition to improve the storage qualities, one or more waxes, wherein at least 95% of said waxes have a temperature at the onset of melting which is greater than or equal to 50° C.