US 5,538,667 AGranted

Ultramulsions

AssigneeWhiteHill Oral Technologies, Inc.

InventorsIra D. Hill, Dale G. Brown

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Abstract

The present invention relates to water-free, co-solvent free, stable, dispersions of certain polydimethylsiloxanes in certain nonionic, poloxamer surfactants; wherein: a. the dispersed polydimethylsiloxanes, which are insoluble in said surfactant, are oriented by the surfactant such that when dispersed in water they are particularly adept at forming oriented, monolayer coatings on various substrates, and b. the particle size of the dispersed polydimethylsiloxane is from between about 0.5 and about 10 microns, with a particle size distribution such that from between about 80 and 95% of the dispersed polydimethylsiloxane is within this particle size range. These stable dispersions are described as ultramulsions, which, together with their physical properties, distinguishes them from emulsions, microemulsions and solutions.

Claims19

Dependent claims

Water-free, co-solvent free, ultramulsions comprising nonionic poloxamer surfactant and polydimethylsiloxane insoluble in said nonionic poloxamer surfactant wherein:

a. said polydimethylsiloxane has the chemical composition (CH.sub.3).sub.3 SiO[SiO(CH.sub.3).sub.2 ].sub.n Si(CH.sub.3).sub.3, wherein n is a whole number from between about 10 and about 400;
b. said nonionic poloxamer surfactant has the chemical composition ##STR2## wherein x, y, and x' are whole numbers;
c. the viscosity of the polydimethylsiloxane ranges from between about 100 and about 100,000 cs;
d. the particle size of most of the polydimethylsiloxane in the ultramulsion is from between about 0.5 and about 10 microns;
e. from between about 80% and 95% of said polydimethylsiloxane particles in the ultramulsions are from between about 1 and about 10 microns;
f. the nonionic poloxamer surfactant is a polyoxyethylene-polyoxypropylene block copolymer having a molecular weight from between about 1,100 and about 150,000;
g. the ratio of nonionic poloxamer surfactant to polydimethylsiloxane is from between about 400:1 and about 1:2;
and
h. the viscosity of the ultramulsion is from between about 8,000 and about 40,000 cs at 130.degree. C., and
i. the ultramulsion dispersed in water is stable.

7 more elements

Dependencies are inferred from the claim text.