Personal care products containing high refractive index esters and methods of preparing the same

Abstract

The invention includes personal care compositions and methods of preparing these personal care compositions that include incorporation of a polyol polyester that is the reaction product of an aliphatic polyol that does not contain an ether group, and benzoic acid, wherein the resultant polyol polyester has a refractive index at 25° C. of greater than about 1.5. The aliphatic polyol may have two to three carbon atoms. Alternatively, the invention includes personal care compositions and methods of preparing personal care compositions including incorporating a polyol polyester into a personal care formulation. The polyol polyester is represented by formula (I): wherein R is an aliphatic alkyl group that does not contain an ether group and has a refractive index of greater than about 1.5 at 25° C. Also described are methods of preparing personal care compositions comprising a first phase and a second phase, wherein the second phase contains any of the polyol polyesters described above.

1 . A method of preparing a personal care composition, the method comprising: 
 (a) reacting an aliphatic polyol having two to three carbons atoms, which does not contain an ether group, and benzoic acid, to obtain a polyol polyester having a refractive index at 25° C. of greater than about 1.5; and    (b) incorporating the polyol polyester into a personal care formulation.    
   
   
       2 . The method of  claim 1 , wherein the polyol polyester has a viscosity of about 50 to about 70 centistokes.  
   
   
       3 . The method of  claim 1 , wherein the aliphatic polyol is selected from the group consisting of propylene glycol, ethylene glycol, and 1,3-propanediol.  
   
   
       4 . The method of  claim 1 , wherein the refractive index of the polyol polyester is about 1.54 to about 1.60 at 25° C.  
   
   
       5 . The method of  claim 1 , wherein the personal care formulation comprises one or more of a material selected from the group consisting of water, a pigment, an emollient, a therapeutic active ingredient, an aliphatic ester, an emulsifier, and a polymer.  
   
   
       6 . A method of preparing a personal care composition comprising incorporating a polyol polyester into a personal care formulation, wherein the polyol polyester is represented by the formula (I):  
     
       
         
         
             
             
         
       
       wherein R is an aliphatic alkyl group that does not contain an ether group and has a refractive index of greater than about 1.5 at 25° C.  
     
   
   
       7 . The method of  claim 6 , wherein the personal care formulation comprises one or more of a material selected from the group consisting of water, a pigment, an emollient, a therapeutic active ingredient, an aliphatic ester, an emulsifier, and a polymer.  
   
   
       8 . The method of  claim 6 , wherein the wherein the polyol polyester has a viscosity of about 50 to about 70 centistokes.  
   
   
       9 . The method of  claim 6 , wherein the wherein the refractive index of the polyol polyester is about 1.54 to about 1.60 at 25° C.  
   
   
       10 . A polyol polyester for use in a personal care product represented by the formula (I):  
     
       
         
         
             
             
         
       
       wherein R is an aliphatic alkyl group that does not contain an ether group, and the polyol polyester has a refractive index of greater than 1.5 at 25° C.  
     
   
   
       11 . The polyol polyester of  claim 10 , wherein R is an aliphatic alkyl group of two to three carbon atoms.  
   
   
       12 . The polyol polyester of  claim 10 , wherein the polyol polyester is 1,2-ethanediol.  
   
   
       13 . The polyol polyester of  claim 10 , wherein the polyol polyester is 1,2-propanediol.  
   
   
       14 . The polyol polyester of  claim 10 , wherein the polyol polyester is 1,3-propanediol.  
   
   
       15 . A personal care composition comprising a polyol polyester represented by the formula (I):  
     
       
         
         
             
             
         
       
       wherein R is an aliphatic alkyl group that does not contain an ether group.  
     
   
   
       16 . The personal care composition of  claim 15 , wherein R is an aliphatic alkyl group of two to three carbon atoms.  
   
   
       17 . The personal care composition of  claim 15 , wherein the polyol polyester is 1,2-ethanediol.  
   
   
       18 . The personal care composition of  claim 15 , wherein the polyol polyester is 1,2-propanediol.  
   
   
       19 . The personal care composition of  claim 15 , wherein the polyol polyester is 1,3-propanediol.  
   
   
       20 . The personal care composition of  claim 15 , wherein the composition is an aqueous composition.  
   
   
       21 . The personal care composition, of  claim 15 , wherein the composition is a non-aqueous composition.  
   
   
       22 . A method of increasing the refractive index of a personal care composition comprising incorporating into the composition an amount of a polyol polyester represented by the formula (I):  
     
       
         
         
             
             
         
       
       wherein R is an aliphatic alkyl group that does not contain an ether group and the refractive index of the polyol polyester is greater than 1.5.  
     
   
   
       23 . The method of  claim 22 , wherein R is an aliphatic alkyl group of two to three carbon atoms.  
   
   
       24 . The method of  claim 22 , wherein the polyol polyester is wherein the polyol is 1,2-ethanediol.  
   
   
       25 . The method of  claim 22 , wherein the polyol polyester is wherein the polyol is 1,2-propanediol.  
   
   
       26 . The method of  claim 22 , wherein the polyol polyester is wherein the polyol is 1,3-propanediol.  
   
   
       27 . A method of preparing a composition comprising mixing a first phase with a second phase, wherein the second phase comprises a polyol polyester represented by the formula (I):  
     
       
         
         
             
             
         
       
       wherein R is an aliphatic alkyl group that does not contain an ether group, wherein the difference between the refractive index of the first phase and that of the second phase is less than about 0.5.  
     
   
   
       28 . The method of  claim 27 , wherein difference between the refractive index of the first phase and the refractive index of the second phase is about 0.  
   
   
       29 . The method of  claim 27 , wherein the first phase comprises an antiperspirant active ingredient.  
   
   
       30 . A method of preparing a composition having a refractive index of greater than about 1.4 at 25° C. comprising mixing at least one aliphatic ester with a polyol polyester represented by the formula (I):  
     
       
         
         
             
             
         
       
       wherein R is an aliphatic alkyl group that does not contain an ether group, and the composition has a refractive index of greater than about 1.5.  
     
   
   
       31 . A method of adjusting the phase of a personal care composition that comprises a first phase having a refractive index of less than or equal to about 1.5 and a second phase that has a refractive index that is lower than that of the first phase, the method comprising incorporating an amount of a polyol polyester into the second phase such that the difference between the refractive indices of the at least two phases is reduced.  
   
   
       32 . The method of  claim 31 , wherein the difference between the refractive indices of the at least two phases is about 0.2 to about 0.5.