Microspheres

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 9/18 (2006.01) C08K 5/01 (2006.01) C08L 27/08 (2006.01) C08L 33/12 (2006.01) C08L 33/20 (2006.01) D21H 21/54 (2006.01)

Patent

CA 2529139

The invention relates to a process for the production of paper or nonwoven from fibres comprising the steps of adding thermally expandable microspheres comprising a thermoplastic polymer shell and a propellant entrapped therein to a stock comprising fibres or to a web of fibres, forming paper or nonwoven from the stock or the web, and applying heat to raise the temperature of the microspheres sufficiently for them to expand and thereby increase the bulk of the paper or the nonwoven, wherein said expandable microspheres comprise from about 17 to about 40 wt% propellant and have a volume-average diameter from about 17 to about 35 µm. The invention also concerns certain expandable microspheres and use thereof.

L'invention concerne un procédé servant à fabriquer du papier ou du non tissé à partir de fibres, ce qui consiste à effectuer l'apport de microsphères pouvant se dilater sous l'effet de la chaleur et composées d'une enveloppe polymère thermoplastique et d'un propulseur piégé dans ladite enveloppe, à une charge composée de fibres ou à une bande de fibres, à fabriquer du papier ou du non tissé à partir de la charge ou de la bande et à appliquer de la chaleur afin d'élever la température des microsphères d'une façon suffisante afin que ces microsphères se dilatent, ce qui permet d'augmenter le volume du papier ou du non tissé, lesdites microsphères étant composées de 17 à 40 % en poids de propulseur et possédant un diamètre moyen volumique de 17 à 35 µm. L'invention concerne également certaines microsphères pouvant se dilater et leur utilisation.

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