Copolymer and oily gelling agent
Copolymers derived from hydrophobic monomers of formula (1), and hydrophilic monomers of formulas (2) and (3), are provided The copolymers are useful as gelling agents for oils used in cosmetics and cosmetic emulsions.
1. A copolymer derived from a mixture consisting of a hydrophobic monomer unit having a general formula (1)
wherein, R 1 is at least one alkyl group selected from the group consisting of straight chained and branched alkyl group, having 16 to 22 carbon atoms; and R 2 is selected from the group consisting of a hydrogen atom and a methyl;
and a hydrophilic monomer unit having a general formula (2)
wherein R 3 is selected from the group consisting of glyceryl group, and polypropylene glycol group illustrated as —(C 3 H 6 O) n H, wherein n is an integer of 2 to 10, R 4 is hydrogen or methyl;
and wherein the mole ratio of hydrophobic monomer (1) to hydrophilic monomer (2) ranges from 4:6 to 7:3.
2. The copolymer according to claim 1 , wherein: said hydrophobic monomer having the general formula (1) is selected from the group consisting of cetyl (meth)acrylate, stearyl (meth)acrylate, and behenyl (meth)acrylate.
3. The copolymer according to claim 1 , wherein: said hydrophilic monomer having the general formula (2) is selected from the group consisting of glyceryl methacrylate and PPG-6 acrylate.
4. The copolymer according to claim 1 , wherein: said hydrophilic monomer having the general formula (2) is glyceryl methacrylate.
5. An oily gelling agent, comprising the copolymer according to claim 1 .
6. An oily gelled composition comprising the oily gelling agent according to claim 5 .
7. An oily cosmetic comprising the oily gelled composition according to claim 6 .
8. A water-in-oil cosmetic comprising the oily gelled composition according to claim 6 .