Water-in-oil-in water emulsion
First Claim
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1. A method of making a multiple emulsion of the type W1 /O/W2 comprising first preparing a primary emulsion W1 /O using a silicone fluid as the oil phase (O) and an elastomeric silicone polyether as an emulsifier for dispersing the water phase W1 into the oil phase (O), and then adding and dispersing the primary emulsion W1 /O into a final continuous water phase W2 to form the multiple emulsion W1 /O/W2.
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Abstract
A multiple emulsion of the type W1 /O/W2 is made by first preparing a primary emulsion W1 /O using a silicone fluid as the oil phase (O), and an elastomeric silicone polyether as an emulsifier, for dispersing water phase W1 into oil phase (O). The primary emulsion W1 /O is then added and dispersed into a final continuous water phase W2 to form a multiple emulsion W1 /O/W2. The multiple emulsions are useful for treating the hair, the skin, or the underarm areas of the human body. Vitamins or drugs can be included in the oil phase (O) or in either aqueous phase W1 or W2 to enhance the benefits of the multiple emulsions in personal care applications.
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10 Claims
- 1. A method of making a multiple emulsion of the type W1 /O/W2 comprising first preparing a primary emulsion W1 /O using a silicone fluid as the oil phase (O) and an elastomeric silicone polyether as an emulsifier for dispersing the water phase W1 into the oil phase (O), and then adding and dispersing the primary emulsion W1 /O into a final continuous water phase W2 to form the multiple emulsion W1 /O/W2.
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2. A method of making a multiple emulsion of the type W1 /O/W2 comprising first preparing a primary emulsion W1 /O using an elastomeric silicone polyether as an emulsifier for dispersing the water phase W1 into the oil phase (O), and then adding and dispersing the primary emulsion W1 /O into a final continuous water phase W2 to form the multiple emulsion W1 /O/W2 ;
- the emulsifier being a silicone elastomer prepared by a method comprising reacting;
(A) an .tbd.Si--H containing polysiloxane of the formula R3 SiO(R'"'"'2 SiO)a (R"HSiO)b SiR3 or the formula (R'"'"'2 SiO)a (R"HSiO)b, and optionally an .tbd.Si--H containing polysiloxane of the formula HR2 SiO(R'"'"'2 SiO)c SiR2 H or an .tbd.Si--H containing polysiloxane of the formula HR2 SiO(R'"'"'2 SiO)a (R"HSiO)b SiR2 H, where R, R'"'"', and R" are alkyl groups with 1-6 carbon atoms, a is 0-250, b is 1-250, and c is 0-250; and (B) a mono-alkenyl polyether of the formula CH2 ═
CH(CH2)f O(CH2 CH2 O)g (CH2 CH3 CHO)h T, or the formula CH2 ═
CH--Q--O(CH2 CH2 O)g (CH2 CH3 CHO)h T, where T is hydrogen, a C1 -C10 alkyl group, an aryl group, or a C1 -C20 acyl group;
Q is a divalent linking group containing unsaturation;
f is 1-6, g is 4-30; and
h is zero or 1-100;
in the presence of a platinum catalyst, until an .tbd.Si--H containing polysiloxane with polyether groups is formed;and reacting; (C) the .tbd.Si--H containing polysiloxane with polyether groups; and (D) an unsaturated hydrocarbon selected from the group consisting of alpha, omega-dienes of the formula CH2 ═
CH(CH2)d CH═
CH2, alpha, omega-diynes of the formula CH.tbd.C(CH2)e C.tbd.CH, and alpha, omega-ene-ynes of the formula CH2 ═
CH(CH2)e C.tbd.CH, where d is 1-20 and e is 0-20;
in the presence of(E) an oil selected from the group consisting of (i) organic compounds, (ii) compounds containing a silicon atom, (iii) mixtures of organic compounds, (iv) mixtures of compounds containing a silicon atom, and (v) mixtures of organic compounds and compounds containing a silicon atom; and
in the presence of a platinum catalyst, until a silicone elastomer is formed by crosslinking and addition of .tbd.SiH across double or triple bonds in the unsaturated hydrocarbon. - View Dependent Claims (6, 8)
- the emulsifier being a silicone elastomer prepared by a method comprising reacting;
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9. A composition comprising a multiple emulsion of the type W1 /O/W2, which multiple emulsion comprises a primary emulsion W1 /O including a silicone fluid as the oil phase (O) of the primary emulsion, an elastomeric silicone polyether as the emulsifier for dispersing the water phase W1 of the primary emulsion into the oil phase (O) forming the primary emulsion, and a final continuous water phase W2, containing, and in which is dispersed, the primary emulsion W1 /O, to form the multiple emulsion W1 /O/W2.
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10. A composition comprising a multiple emulsion of the type W1 /O/W2, which multiple emulsion comprises a primary emulsion W1 /O including as the oil phase (O) of the primary emulsion, an oil selected from the group consisting of (i) organic compounds, (ii) compounds containing a silicon atom, (iii) mixtures of organic compounds, (iv) mixtures of compounds containing a silicon atom, and (v) mixtures of organic compounds and compounds containing a silicon atom;
- an elastomeric silicone polyether as the emulsifier for dispersing the water phase W1 of the primary emulsion into the oil phase (O) for forming the primary emulsion; and
a final continuous water phase W2, containing, and in which is dispersed, the primary emulsion W1 /O, for forming the multiple emulsion W1 /O/W2 ;
the emulsifier being a silicone elastomer prepared by a method comprising reacting;(A) an .tbd.Si--H containing polysiloxane of the formula R3 SiO(R'"'"'2 SiO)a (R"HSiO)b SiR3 or the formula (R'"'"'2 SiO)a (R"HSiO)b, and optionally an .tbd.Si--H containing polysiloxane of the formula HR2 SiO(R'"'"'2 SiO)c SiR2 H or an .tbd.Si--H containing polysiloxane of the formula HR2 SiO(R'"'"'2 SiO)a (R"HSiO)b SiR2 H, where R, R'"'"', and R" are alkyl groups with 1-6 carbon atoms, a is 0-250, b is 1-250, and c is 0-250; and (B) a mono-alkenyl polyether of the formula CH2 ═
CH(CH2)f O(CH2 CH2 O)g (CH2 CH3 CHO)h T, or the formula CH2 ═
CH--Q--O(CH2 CH2 O)g (CH2 CH3 CHO)h T, where T is hydrogen, a C1 -C10 alkyl group, an aryl group, or a C1 -C20 acyl group;
Q is a divalent linking group containing unsaturation;
f is 1-6, g is 4-30; and
h is zero or 1-100;
in the presence of a platinum catalyst, until an .tbd.Si--H containing polysiloxane with polyether groups is formed;and reacting; (C) the .tbd.Si--H containing polysiloxane with polyether groups; and (D) an unsaturated hydrocarbon selected from the group consisting of alpha, omega-dienes of the formula CH2 ═
CH(CH2)d CH═
CH2, alpha, omega-diynes of the formula CH.tbd.C(CH2)e C.tbd.CH, and alpha, omega-ene-ynes of the formula CH2 ═
CH(CH2)e C.tbd.CH, where d is 1-20 and e is 0-20;
in the presence of(E) an oil selected from the group consisting of (i) organic compounds, (ii) compounds containing a silicon atom, (iii) mixtures of organic compounds, (iv) mixtures of compounds containing a silicon atom, and (v) mixtures of organic compounds and compounds containing a silicon atom; and
in the presence of a platinum catalyst, until a silicone elastomer is formed by crosslinking and addition of .tbd.SiH across double or triple bonds in the unsaturated hydrocarbon.
- an elastomeric silicone polyether as the emulsifier for dispersing the water phase W1 of the primary emulsion into the oil phase (O) for forming the primary emulsion; and
Specification
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Current AssigneeDow, Inc.
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Original AssigneeDow, Inc.
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InventorsLin, Zuchen, Zhang, Shizhong, Schulz, William James Jr.
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Primary Examiner(s)Foelak, Morton
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Application NumberUS09/228,863Time in Patent Office238 DaysField of Search524/837, 524/588US Class Current524/837CPC Class CodesA61K 8/066 Multiple emulsions, e.g. wa...A61K 8/585 Organosilicon compoundsA61K 8/894 modified by a polyoxyalkyle...A61Q 15/00 Anti-perspirants or body de...A61Q 19/00 Preparations for care of th...A61Q 5/12 Preparations containing hai...
