Cosmetic emulsion and method for making the same

Claim 1

A cosmetic emulsion comprising: (a) 0.2 to 5 wt% of an emulsifier consisting essentially of (1) a dimethylpolysiloxane-polyoxyalkylene copolymer represented by the general formula (I) in which a represents an integer of from 10 to 25, b is an integer of from 25 to 35, m is an integer of from 60 to 80, and n is an integer of from 3 to 8, (2) a surface active agent having an HLB value not smaller than 10, and (3) a linear, saturated higher alcohol having from 12 to 22 carbon atoms; (b) 0.5 to 10 wt% of an oil comprising 90% or more of at least one polysiloxane represented by the general formula (II), (III) or (IV) in which x represents an integer of from 4 to 100, z is an integer not smaller than 1, y + z is a value from 1 to 100, and & is an integer of from 2 to 5; and (c) 85 to 99.3 wt% of a water phase comprising 60 to 100 wt%, based on the total water phase, of an ethyl alcohol aqueous solution in which an ethyl alcohol to water ratio by weight is 50:50 to 2:98.

Claim 6

A method for making a cosmetic emulsion which comprises, as essential components, (a) 0.2 to 5 wt% of an emulsifier consisting essentially of (1) a dimethylpolysiloxane-polyoxyalkylene copolymer represented by the general formula (I) in which a represents an integer of from 10 to 25, b is an integer of from 25 to 35, m is an integer of from 60 to 80, and n is an integer of from 3 to 8, (2) a surface active agent having an HLB value not smaller than 10, and (3) a linear, saturated higher alcohol having from 12 to 22 carbon atoms; (b) 0.5 to 10 wt% of an oil comprising 90% or more of at least one polysiloxane represented by the general formula (II), (III) or (IV) in which x represents an integer of from 4 to 100, z is an integer not smaller than 1, y + z is a value from 1 to 100, and £ is an integer of from 2 to 5; and (c) 85 to 99.3 wt% of a water phase comprising 60 to 100 wt%, based on the total water phase, of an ethyl alcohol aqueous solution in which an ethyl alcohol to water ratio by weight is 50:50 to 2:98, the method comprising the steps of adding the ethyl alcohol aqueous solution having an ethylalcohol/water ratio by weight in the range of 20/80 to 70/30, to a mixture of 0.2 to 5 parts by weight of the emulsifier (a) and 0.5 to 10 parts by weight of the oil (b) at a temperature of from 20 to 45°C under agitation, thereby obtaining an o/w emulsion, and, optionally, further adding water or an ethyl alcohol aqueous solution to the o/w emulsion to give an intended composition.

Claim 7

A method for making a cosmetic emulsion which comprises, as essential components, (a) 0.2 to 5 wt% of an emulsifier consisting essentially of (1) a dimethylpolysiloxane-polyoxyalkylene copolymer represented by the general formula (I) in which a represents an integer of from 10 to 25, b is an integer of from 25 to 35, m is an integer of from 60 to 80, and n is an integer of from 3 to 8, (2) a surface active agent having an HLB value not smaller than 10, and (3) a linear, saturated higher alcohol having from 12 to 22 carbon atoms; (b) 0.5 to 10 wt% of an oil comprising 90% or more of at least one polysiloxane represented by the general formula (II), (III) or (IV) in which x represents an integer of from 4 to 100, z is an integer not smaller than 1, y + z is a value from 1 to 100, and £ is an integer of from 2 to 5; and (c) 85 to 99.3 wt% of a water phase comprising 60 to 100 wt%, based on the total water phase, of an ethyl alcohol aqueous solution in which an ethyl alcohol to water ratio by weight is 50:50 to 2:98, the method comprising the steps of adding the ethyl alcohol aqueous solution having an ethylalcohol/water ratio by weight in the range of 20/80 to 70/30, to a mixture of 0.2 to 5 parts by weight of the emulsifier (a) and 0.5 to 10 parts by weight of the oil (b) at a temperature of from 20 to 45°C under agitation, thereby obtaining an o/w emulsion, and, optionally, further adding water or an ethyl alcohol aqueous solution to the o/w emulsion to give an intended composition.