Liquid non-aqueous dispersion and process for producing the same
A liquid non-aqueous dispersion comprising a silicone oil and a copolymer dispersed therein, the copolymer comprising (A) at least one radical polymerizable macromonomer containing dimethyl polysiloxane, and (B) at least one radical copolymerizable monomer with the macromonomer (A), which comprises at least one (meth)acrylate monomer and optionally at least one vinyl monomer. This liquid non-aqueous dispersion has excellent water resistance, oil resistance and adhesive properties, and when used as a component of cosmetics, it can meet both requirements for long lasting make-up and good feeling of use of cosmetics.
1. A liquid non-aqueous dispersion comprising a silicone oil and a particulate copolymer dispersed therein without the presence of a dispersion stabilizer,
wherein a viscosity of the dispersion is 3.6 to 5.3 Ps and a particle size of the particulate copolymer is 0.05 to 2.0 μm,
wherein said copolymer is obtained by one-step copolymerizing (A) 1 to 20% by weight of at least one radical polymerizable macromonomer containing dimethyl polysiloxane, the macromonomer (A) being represented by the formula (1):
(wherein X represents a radical polymerizable group, n is an integer of 1 to 10, and m is an integer of 3 to 300), and (B) 99 to 80% by weight of at least one radical copolymerizable monomer with said macromonomer (A), the monomer (B) comprising at least one (meth)acrylate monomer and optionally at least one vinyl monomer, in a silicone oil without using any dispersion stabilizer.
2. A liquid non-aqueous dispersion according to claim 1 , wherein the radical polymerizable macromonomer is at least one substance selected from the group consisting of dimethylpolysiloxypropylacrylic ester, dimethylpolysiloxypropylmethacrylic ester, dimethylpolysiloxypropylvinylbenzyl ether, dimethylpolysiloxypropylacrylamide and dimethylpolysiloxypropionic vinylbenzylate.
3. A liquid non-aqueous dispersion according to claim 2 , wherein the radical polymerizable macromonomer is dimethylpolysiloxypropylacrylic ester or dimethylpolysiloxypropylmethacrylic ester.
4. A liquid non-aqueous dispersion according to claim 1 , wherein the (meth)acrylate monomer is at least one selected from the group consisting of methyl methacrylate, butyl methacrylate, butyl acrylate, 2-ethylhexyl methacrylate and 2-hydroxyethyl methacrylate.
5. A liquid non-aqueous dispersion according to claim 1 , wherein the number-average molecular weight of the radical polymerizable macromonomer is 1,000 to 100,000.
6. A liquid non-aqueous dispersion according to claim 1 , wherein the weight-average molecular weight of the copolymer is 5,000 to 500,000.
7. A liquid non-aqueous dispersion according to claim 1 , wherein the average particle size of the copolymer dispersed in silicone oil is 0.27 to 0.30 μm.
8. A cosmetic composition comprising the liquid non-aqueous dispersion according to claim 1 .
9. A liquid non-aqueous dispersion comprising silicone oil and a particulate copolymer dispersed therein without the presence of a dispersion stabilizer,
wherein the dispersed particles have such a structure that polydimethylsiloxane exists on their surfaces, in a particle size of 0.05 to 2.0 μm,
wherein the copolymer is obtained by one-step copolymerizing (A) 1 to 20% by weight of at least one radical polymerizable macromonomer containing dimethyl polysiloxane, the macromonomer (A) being represented by the formula (1):
(wherein X represents a radical polymerizable group, n is an integer of 1 to 10, and m is an integer of 3 to 300), and (B) 99 to 80% by weight of at least one radical copolymerizable monomer with said macromonomer (A), the monomer (B) comprising at least one (meth)acrylate monomer and optionally at least one vinyl monomer, in a silicone oil without using any dispersion stabilizer.