Polar solvent-in-oil emulsions and multiple emulsions

Details Polar solvent-in-oil emulsions and multiple emulsions Polar solvent-in-oil emulsions and multiple emulsions

2000-02-07

2001-01-23

Foelak, Morton (Department: 1711)

Drug, bio-affecting and body treating compositions

Topical body preparation containing solid synthetic organic...

Skin cosmetic coating

C524S261000, C524S379000, C524S386000, C524S387000, C524S588000

Reexamination Certificate

active

06177071

ABSTRACT:

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
REFERENCE TO A MICROFICHE APPENDIX
Not applicable.
FIELD OF THE INVENTION
This invention is directed to (i) polar solvent-in-oil emulsions PS
1
/O, (ii) polar solvent-in-oil-in-water multiple emulsions PS
1
/O/W, and (iii) polar solvent-in-oil-in-polar solvent multiple emulsions PS
1
/O/PS
2
. In particular, these emulsions contain a non-aqueous polar solvent(s).
BACKGROUND OF THE INVENTION
U.S. Pat. No. 5,948,855 (Sept. 7, 1999) describes certain water-in-oil emulsions W
1
/O and multiple emulsions W
1
/O/W
2
which can be prepared with crosslinked elastomeric silicone polyethers as an emulsifier. These crosslinked elastomeric silicone polyethers and methods for their preparation are described in U.S. Pat. No. 5,811,487 (Sept. 22, 1998) and in U.S. Pat. No. 5,889,108 (Mar. 30, 1999). These patents are assigned to the same assignee as the present invention.
However, none of the common assignee's patents describe the use of the crosslinked elastomeric silicone polyethers as emulsifiers for preparing non-aqueous polar solvent-in-oil emulsions PS
1
/O and multiple emulsions PS
1
/O/W and PS
1
/O/PS
2
. The advantage of emulsions of the type PS
1
/O, PS
1
/O/W, and PS
1
/O/PS
2
, is that they can be used to deliver polar actives such as Vitamin C or activated antiperspirant salts such as aluminum chlorohydrate and aluminum-zirconium trichlorohydrate, which are known to have much better chemical stability in non-aqueous polar solvents such as propylene glycol than in water.
BRIEF SUMMARY OF THE INVENTION
In a first embodiment, the invention relates to a composition which is a non-aqueous polar solvent-in-oil emulsion containing a non-aqueous polar solvent phase dispersed in a silicone oil continuous phase by an emulsifier.
In a second embodiment, the invention relates to a composition which is a non-aqueous polar solvent-in-oil-in-water multiple emulsion of the type PS
1
/O/W which contains a non-aqueous polar solvent phase PS
1
dispersed in a silicone oil as a first continuous phase of a primary emulsion PS
1
/O by an emulsifier. The primary emulsion PS
1
/O is dispersed in a second continuous aqueous phase W to form the multiple emulsion PS
1
/O/W.
In a third embodiment, the invention relates to a composition which is a non-aqueous polar solvent-in-oil-in-non-aqueous polar solvent multiple emulsion of the type PS
1
/O/PS
2
which contains a non-aqueous polar solvent phase PS
1
dispersed in a silicone oil as a first continuous phase of a primary emulsion PS
1
/O by an emulsifier. The primary emulsion PS
1
/O is dispersed in a second continuous non-aqueous polar solvent phase PS
2
to form the multiple emulsion PS
1
/O/PS
2
.
In the three embodiments, the emulsifier is a crosslinked elastomeric silicone polyether constituting polymeric molecules crosslinked together to form a gel consisting of three-dimensional molecular polymeric networks containing tens, hundreds, and thousands of crosslinking units between and among the polymeric molecules. The crosslinked elastomeric silicone polyether contains and is swollen by about 65 to about 98 percent by weight of a silicone oil.
These and other features of the invention will become apparent from a consideration of the detailed description.


REFERENCES:
patent: 5811487 (1998-09-01), Lin
patent: 5889108 (1999-03-01), Zhang
patent: 5948855 (1999-09-01), Lin

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