Branched saturated hydrocarbon cosmetic ingredient

Abstract

A cosmetic ingredient comprising at least one plant squalane and at least one mixture of C24 to C48 alkanes, in at least dimeric form, chosen amongst the alkanes of formula (I), (I) where—n is 1 or 0,—at least one of the R 1 , R′ 1 , R 2 , R′ 2 , R 3 and R′ 3 , which may be identical or different, is chosen amongst the straight or branched C8 to C30 alkyl radicals, and at most one of R 1 , R′ 1 , R 2 , R′ 2 , R 3 and R′ 3 is a methyl radical, said mixture of C24 to C48 alkanes having a viscosity between 12 and 25 mm 2 /s at 40° C., and to a use thereof as a plant squalane substitute.

1 .- 17 . (canceled) 
     
     
         18 . A cosmetic ingredient comprising at least one plant squalane and at least one mixture of C24 to C48 alkanes, in at least dimeric form, chosen amongst the alkanes of formula I, 
       
         
           
           
               
               
           
         
         wherein 
         n is 1 or 0, 
         R 1 , R′ 1 , R 2 , R′ 2 , R 3  and R′ 3 , which may be identical or different, are chosen amongst the group consisting of the hydrogen atoms —H, the methyl radicals and the linear C8 to C30 alkyl radicals, 
         at least one of R1, R′1, R2, R′2, R3 and R′3, which may be identical or different, is chosen amongst the linear C8 to C30 alkyl radicals, 
         and at least one and at most one of R1, R′1, R2, R′2, R3 and R′3 is a methyl radical, said mixture of C24 to C48 alkanes having a viscosity between 12 and 25 mm2/s at 40° C. 
       
     
     
         19 . The cosmetic ingredient according to  claim 18 , wherein the alkanes are chosen amongst the alkanes of formula I, where R′ 1 , R 1  and R 2  are hydrogen atoms, R′ 2  is a methyl radical and n is equal to 0, of formula Ia, in which R 3  and R′ 3  are chosen amongst the linear C8 to C30 alkyl radicals. 
       
         
           
           
               
               
           
         
       
     
     
         20 . The cosmetic ingredient according to  claim 18 , wherein the alkanes are chosen amongst the alkanes of formula I, where R′ 1  and R 1  are hydrogen atoms, R′ 2  is a methyl radical and n is equal to 1, of formula Ib in which R 2 , R 3  and R′ 3  are chosen amongst the linear C8 to C30 alkyl radicals. 
       
         
           
           
               
               
           
         
       
     
     
         21 . The cosmetic ingredient according to  claim 18 , wherein the alkanes are chosen amongst the alkanes of formula I, where R′ 1  and R 1  are hydrogen atoms and n is equal to 0, of formula Ic, in which R 2 , R′ 2 , R 3  and R′ 3  are chosen amongst the linear C8 to C30 alkyl radicals and at least one and at most one of R 2 , R′ 2 , R 3  and R′ 3  is a methyl radical. 
       
         
           
           
               
               
           
         
       
     
     
         22 . The ingredient according to  claim 18 , wherein the branched alkanes of formula I, Ia, Ib or Ic comprise from 30 to 36 carbon atoms and consist primarily of dimers and trimers. 
     
     
         23 . The ingredient according to  claim 18 , wherein n is equal to 1. 
     
     
         24 . The ingredient according to  claim 18 , wherein n is equal to 0. 
     
     
         25 . The ingredient according to  claim 18 , wherein it includes, in addition, at least one branched C24 to C48 alkane of general formula II, 
       
         
           
           
               
               
           
         
         wherein 
         at least one of R 1 , R 2  and R 3 , which may be identical or different, is chosen amongst the linear C8 to C30 alkyl radicals, 
         and at most one of R 1 , R 2  and R 3  is a hydrogen atom. 
       
     
     
         26 . The ingredient according to  claim 25 , wherein the at least one branched alkane of formula II includes 28 to 36 carbons. 
     
     
         27 . A method comprising preparing a composition of which the organoleptic and sensory properties are preserved with the cosmetic ingredient according to  claim 18 , while replacing at least 50% of plant squalane in the composition.