Ultramulsions

B - Operations – Transporting – 01 – J

Patent

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B01J 13/00 (2006.01) A61K 8/06 (2006.01) A61K 8/891 (2006.01) A61K 8/90 (2006.01) A61Q 11/00 (2006.01) B01F 17/00 (2006.01) C08J 3/03 (2006.01) C08L 83/04 (2006.01) C11D 1/722 (2006.01) C11D 1/76 (2006.01) C11D 3/37 (2006.01)

Patent

CA 2175245

The present invention relates to water-free, co-solvent free, stable dispersions of certain polydimethylsiloxanes in certain nonionic, polyoxamer surfactants; wherein: a) the dispersed polydimethylsiloxanes, esp. those having the chemical composition (CH3)3SiO[SiO(Ch3)2]nSi(Ch3)3 wherein n is a whole number from between about 10 and about 400, which are insoluble in the surfactant, esp. a nonionic surfactant of the polyoxyethylene-polyoxypropylene block copolymer type, 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 polydimethyl- siloxane 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 (stable when dispersed in water), distinguishes them from emulsions, microemulsions and solutions, and are useful in various products, such as mouthrinses, toothpastes, confectioneries, antacids, mold/release lubricants, plasticizers, cleaners, cosmetics and skin care products.

L'invention porte sur des dispersions stables et exemptes d'eau et de co-solvant de certains polydiméthyl-siloxanes dans certains agents de surface non ioniques du type polyoxamère, dans lesquels: (a) les polydiméthyl-siloxanes dispersés, y compris ceux de formule (CH¿3?)¿3?SiO[SiO(CH¿3?)¿2?]¿n?Si(CH¿3?)¿3? où n est un entier compris entre environ 10 et environ 400, qui sont insolubles dans l'agent de surface et en particulier dans un agent de surface polymère bloc non ionique du type polyoxyéthylène-polyoxypropylène, sont orientés par l'agent de surface de façon à ce qu'une fois dispersés dans l'eau, ils s'avèrent particulièrement aptes à former des revêtements monocouches orientés, sur différents substrats, et (b) la taille des particules du polydiméthyl-siloxane est comprise entre environ 0,5 et environ 10 microns avec une distribution de la taille des particules telle que 80 à 95 % environ du polydiméthyl-siloxane dispersé se trouve dans cette plage de dispersion. Ces dispersions stables, dites ultramulsions, qui en fonction de leurs propriétés physiques (par exemple de stabilité une fois dispersées dans l'eau) se distinguent des émulsions, des microémulsions et des solutions courantes, peuvent servir dans les eaux dentifrices, les dentifrices, la confiserie, les antiacides, les lubrifiants de moulage/démoulage, les plastifiants, les produits de nettoyage, les cosmétiques et les produits de soins pour la peau.

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