Absorbent articles comprising surface cross-linked...

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 3/28 (2006.01) A61L 15/60 (2006.01)

Patent

CA 2620653

The present invention relates to absorbent articles comprising superabsorbent polymer (SAP) particles, the SAP particles being made by a method of surface cross-linking superabsorbent polymer particles using UV irradiation. The method is carried out in a so-called drum reactor, which comprises a hollow drum and an irradiation source. The drum has a longitudinal axis and a cross- section. Radical former molecules are applied on the surface of superabsorbent polymer particles. These superabsorbent polymer particles are fed into the drum and are irradiated while they move within the drum, which is rotated around its longitudinal axis. The irradiation source is provided such that the radiation emitted by the irradiation source is able to reach superabsorbent polymer particles within said drum. The irradiation source for use in the method of the present invention is able to emit UV radiation of a wavelength between 201 nm and 400 nm.

La présente invention concerne des articles absorbants comprenant des particules polymériques superabsorbantes réticulées produites selon un procédé dans lequel est utilisé un rayonnement ultraviolet extrême. Ce procédé est mis en oeuvre dans un réacteur communément appelé réacteur à tambour, composé d'un tambour creux et d'une source de rayonnement. Ce tambour possède un axe longitudinal et une section transversale. Le procédé consiste à appliquer des molécules formant des radicaux sur la surface des particules polymériques superabsorbantes. Ces particules polymériques superabsorbantes sont introduites à l'intérieur du tambour et soumises à un rayonnement au fur et à mesure qu'elles se déplacent à l'intérieur du tambour, le tambour tournant autour de son axe longitudinal. La source de rayonnement est utilisée de façon que le rayonnement émis atteigne les particules polymériques superabsorbantes à l'intérieur du tambour. La source de rayonnement utilisée dans le procédé de la présente invention est capable d'émettre un rayonnement UV d'une longueur d'onde comprise entre 201 nm et 400 nm.

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