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Problems solved by technology
For example, the silicone vesicles formed from the self-assembly procedures can lack durability.
This lack of durability can limit the processing conditions they can be subject to in the fo
Method used
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example 1 (
Reference Example)
Silicone Polyethers Used for Preparation of Vesicle Dispersions
[0039] A series of silicone polyethers were prepared, as illustrated in Table 1 below. This series were “rake type” silicone polyethers since they were derived from various dimethyl-methylhydrogen-polysiloxanes of the general formula, MDxD′yM and allyloxy polyethers. The MDxD′yM siloxanes were prepared according to known techniques. The silicone polyethers were prepared using well know platinum catalyzed hydrosilylation techniques, such as those disclosed in U.S. Pat. No. 2,823,218.
[0040] The D / D′ ratio corresponds to x / y ratio in the formula MDxD′yM and total DP is the sum of x and y. EO7 is allyoxyl poly(ethylene oxide) having about seven EO repeat units, and EO12 is allyoxyl poly(ethylene oxide) having about 12 EO repeat units; both were obtained from Dow Chemical Company (Midland, Mich.).
Effect of D / D′ Ratio of SPEs and Alcohol on Vesicle Dispersion Preparation
[0042] SPEs were generally found to spontaneously disperse in water, forming vesicles, when the D / D′ was 12 or lower, as summarized in Table 2 below. When the D / D′ ratio of the SPE was 15 or higher, the SPEs were less dispersible in water, and the rate of SPE dispersion in water could be very slow to incomplete. This example demonstrates the time needed to disperse SPE 6 (from Example 1) in water and how much faster it disperses when a small amount of isopropanol was present.
[0043] When D / D′ was greater than 15, the SPEs did not spontaneously disperse in water. For example, the SPEs derived from MD70D′3M (such as SPE 8) were not dispersible at all in water, even over more than a period of 2 months.
[0044] Examples 2A and 2B show how SPE 6, a silicone polyether of MD28.8D′1.22M siloxane structure dispersed in water alone and in the presence of 5 % isopropanol, respectively. It took about 3 weeks of continuous...
example 3
Comparative Example
[0047] A dispersion of SPE 8 in water was attempted by incorporating 10.0 g of SPE 8 into 90.0 g of de-ionized water in a glass jar. The jar was subjected to mixing on a rotowheel mixer. Even after 4 weeks of mixing the SPE remained as separated in water, no dispersion was formed.
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Measurement
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Abstract
A process for preparing a vesicle composition based upon mixing an organopolysiloxane having at least one hydrophilic substituent group, a water miscible volatile solvent, and water is disclosed. The vesicle compositions produced by the method are useful in various personal, household, and health care applications.
Description
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority to U.S. patent application Ser. No. 60 / 563,663 as filed, Apr. 20, 2004.FIELD OF THE INVENTION [0002] The present invention provides a process for preparing silicone vesicles by combining and mixing an organopolysiloxane having at least one hydrophilic substituent group, a water miscible volatile solvent, and water. The invention also relates to the vesicle compositions produced by the method and their use in various personal, household, and health care applications. BACKGROUND OF THE INVENTION [0003] Silicone surfactants have been designed for various applications by combining a hydrophobic organopolysiloxane with various hydrophilic moieties. For example, the silicone surfactants known as silicone polyethers are based on copolymer structures of polydimethylsiloxane having pendant polyoxyalkylene groups. Such materials find wide utility in many personal, household, and health care compositions as emulsif...
Claims
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