Surface-modified cellulose microfibrils, method for making...

C - Chemistry – Metallurgy – 08 – B

Patent

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Details

400/1303, 8/93.3

C08B 3/20 (2006.01) C08B 3/06 (2006.01) C08J 5/06 (2006.01) C08L 1/12 (2006.01) C08L 67/04 (2006.01)

Patent

CA 2238390

Cellulose microfibrils, in particular for use as a reinforcing filler or structuring agent in composite materials, a method for making same, and composite materials containing said microfibrils, are disclosed. Specifically, said microfibrils are surface-modified cellulose microfibrils with an L/D ratio higher than 20, preferably higher than 100, and an average diameter of 1-50 nm, where L is the length of the microfibril and D is its average diameter. At least 25 % by number of the hydroxyl functions on the surface of the microfibrils are esterified by at least one organic compound including at least one function capable of reacting with the hydroxyl groups of the cellulose. As a result, when the organic compound is a compound that includes acetyl groups such as acetic acid, said microfibrils are used as a reinforcing filler in a material comprising cellulose acetate as the polymeric matrix. The filled composite material may be shaped to provide films, mouldings, fibres or yarns.

La présente invention concerne des microfibrilles de cellulose notamment utiles comme charge de renfort ou agent structurant de matériaux composites, un procédé de fabrication de celles-ci et les matériaux composites les contenant. L'invention se rapporte plus particulièrement à des microfibrilles de cellulose à surface modifiée présentant un rapport L/D supérieur à 20, de préférence supérieur à 100, et un diamètre moyen compris entre 1 nm et 50 nm (L étant la longueur de la microfibrille et D son diamètre moyen). Ces microfibrilles se caractérisent par le fait qu'au moins 25 % en nombre des fonctions hydroxyles présentes à la surface de cells-ci sont estérifiées par au moins un composé organique comprenant au moins une fonction pouvant réagir avec les groupes hydroxyles de la cellulose. Ainsi, quand le composé organique est un composé comprenant des groupes acétyles tel que l'acide acétique, les microfibrilles de l'invention sont utilisées comme charge de renfort dans un matériau dont la matrice polymérique est l'acétate decellulose. Ce matériau composite chargé peut être mis en forme pour obtenir des films, pièces moulées, fibres ou fils.

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