Non-woven fabric laminate

D - Textiles – Paper – 04 – H

Patent

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Details

D04H 13/00 (2006.01) B32B 5/26 (2006.01) B32B 5/28 (2006.01)

Patent

CA 2294599

A laminate suitable for use as an electrode separator in an electrochemical device is formed from first and second non-woven fabrics which each comprise fibres of a hydrophobic polymeric material. The first fabric is formed from spun fibres and the second fabric is a melt-blown fabric. The fibres of the fabrics have undergone a copolymerisation reaction with a vinyl monomer which is capable of reacting with an acid or a base to form a salt directly or indirectly such as acrylic acid. The reaction involves exposure of the laminate to ultraviolet radiation while impregnated with a solution of the vinyl monomer, and results in grafting of the vinyl monomer to the surfaces of the fibres.

L'invention a pour objet un lamellé pouvant être utilisé comme séparateur d'électrode dans un dispositif électrochimique. Ce lamellé est formé d'un premier et d'un deuxième textiles non tissés qui comprennent chacun des fibres d'un matériau polymère hydrophobe. Le premier textile est formé de fibres filées et le deuxième textile est un non tissé de fusion-soufflage. Les fibres du textile ont subi une réaction de copolymérisation avec un monomère de vinyle qui peut réagir avec un acide ou une base pour former, directement ou indirectement, un sel tel qu'un acide acrylique. Pour mettre en oeuvre cette réaction, le lamellé est exposé aux rayonnements ultra-violets tout en étant imprégné d'une solution du monomère de vinyle. On obtient ainsi une greffe du monomère de vinyle aux surfaces des fibres.

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