Bacterial cellulose-containing formulations and method of...

C - Chemistry – Metallurgy – 12 – P

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C12P 19/04 (2006.01) A01N 43/04 (2006.01) A61K 31/715 (2006.01)

Patent

CA 2609677

New formulations of bacterial cellulose and a new method to produce formulations of bacterial cellulose that exhibit improved viscosity-modifying properties particularly with low energy applied to effectuate viscosity changes therewith is provided. Such a method includes the novel co- precipitation with a water soluble co-agent that permits precipitation in the presence of excess alcohol to form an insoluble fiber that can than be utilized as a thickener or suspension aid without the need to introduce high energy mixing. Such bacterial cellulose properties have been available in the past but only through highly labor and energy intensive processes. Such an inventive method as now proposed thus provides a bacterial cellulose- containing formulation that exhibits not only properties that are as effective as those for previous bacterial celluloses, but, in some ways, improvements to such previous types. Certain end-use compositions and applications including these novel bacterial cellulose-containing formulations are also encompassed within this invention.

L'invention concerne de nouvelles formulations de cellulose bactérienne et un nouveau procédé de production de formulations de cellulose bactérienne qui présentent des propriétés améliorées de modification de viscosité, notamment lorsque de petites quantités d'énergie sont appliquées pour obtenir des modifications de viscosité. Le procédé comporte une étape de coprécipitation utilisant un co-agent soluble dans l'eau, qui permet de produire un précipité en présence d'alcool en excès et entraîne la formation d'une fibre insoluble pouvant être utilisée comme agent épaississant ou facilitant la suspension, et pour laquelle un mélange intensif est superflu. Les propriétés de la cellulose bactérienne ont été utilisées auparavant, mais seulement dans des procédés nécessitant une grande quantité d'énergie et de travail. Le procédé de l'invention utilise une formulation de cellulose bactérienne qui, non seulement possède des propriétés équivalentes à celles de celluloses bactériennes connues, mais apporte d'une certaine manière des perfectionnements aux types existants de cellulose bactérienne. L'invention comprend certaines compositions et applications finales comprenant les formulations de cellulose bactérienne de l'invention.

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