Liquids containing suspended glass particles

A - Human Necessities – 61 – K

Patent

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A61K 9/10 (2006.01) A61K 47/08 (2006.01)

Patent

CA 2562606

Present proposals to use perfluorocarbons as a medium to suspend glass particles presents the problem of aggregation of the particles within the suspending medium. Overcoming this problem requires careful particle sizing and density matching techniques. An additional disadvantage of the large scale use of perfluorocarbons is their contribution to global warming. The inventor has realised that by replacing perfluorocarbons with the more environmentally friendly fluorinated ethers such as hydrofluoroethers or hydrofluoropolyethers a long lasting suspension of glass particles can be achieved without the need for such rigorous particle sizing or density matching processes.

La présente invention se rapporte à l'utilisation de perfluorocarbones en tant que milieu de suspension de particules de verre, qui pose le problème d'agrégation des particules au sein du milieu de suspension. La résolution de ce problème requiert un calibrage soigneux des particules ainsi que des techniques d'adaptation des densités. Un inconvénient supplémentaire de l'utilisation à grande échelle des perfluorocarbones réside dans leur contribution au réchauffement du globe. C'est pourquoi la présente invention se rapporte au remplacement des perfluorocarbones par des éthers fluorés plus écologiques tels que des hydrofluoroéthers ou des hydrofluoropolyéthers, ce remplacement permettant d'obtenir une suspension durable de particules de verre sans recours à des processus rigoureux de calibrage des particules ou d'adaptation des densités.

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