Cosmetic composition containing polyglycerol partial ester
The present invention relates to cosmetic compositions containing polyglycerol partial esters of linear, unsubstituted carboxylic acids and bifunctional carboxylic acids with the provisos that the polyglycerol partial ester comprises an HLB-value from 2 to 10 and that the polyglycerol obtained by hydrolysis or alcoholysis of the polyglycerol partial ester comprises an average degree of polymerization of from 2 to 8 and at least 1% of the polyglycerol comprises cyclic structures. The present invention also relates to the use of aforementioned polyglycerol esters for the production of and use in cosmetic compositions.
1. A cosmetic composition containing a polyglycerol partial ester having the structure of Formula (I)
wherein R 1 , R 2 and R 3 independent from each other, equal or different, are selected from the group consisting of:
—OH,
—OR 4 , wherein R 4 is a linear, unsubstituted acyl radical having a chain length of from 16 to 22 carbon atoms with the proviso that monocarboxylic acids obtained from the acyl radical by saponification have an iodine value of smaller than 50, and
—OR 5 , wherein R 5 is a radical having the structure of Formula (I) wherein one of R 1 , R 2 and R 3 has a direct bond to the oxygen of —OR 5
wherein each molecule of the polyglycerol partial ester comprises at least one of each —OR 4 and —OR 5 , with the provisos that the polyglycerol obtained by hydrolysis or alcoholysis of the polyglycerol partial ester comprises an HLB value from 2 to 10, an average degree of polymerization of from 2 to 8 and the polydispersity index of said polyglycerol is greater than 0.75.
2. The cosmetic composition according to claim 1 , wherein at least 1% of the polyglycerol obtained by hydrolysis or alcoholysis of the contained polyglycerol partial ester comprises cyclic structures.
3. The cosmetic composition according to claim 1 , wherein the polyglycerol partial ester has a melting point of at least 25° C.
4. The cosmetic composition according to claim 1 , wherein the polyglycerol partial ester is obtainable by a method comprising a process of esterification of
a) a polyglycerol mixture comprising an average degree of polymerization of from 2 to 8 with
b) at least one monocarboxylic acid comprising a carboxylic acid HOR 4 , wherein R 4 is a linear, unsubstituted acyl radical with a chain length of from 16 to 22 carbon atoms with the proviso that the at least one carboxylic acid bears an iodine value of smaller than 50.
5. The cosmetic composition according to claim 1 , wherein said composition is a hair care composition.
6. The cosmetic composition according to claim 5 , wherein said composition is a conditioning agent for hair, a hair protecting agent, a hair repair agent or a hair strengthening agent.
7. The cosmetic composition according to claim 1 , wherein said HLB value is from 2.5 to 8.
8. The cosmetic composition according to claim 1 , wherein said HLB value is from 3 to 6.