An absorbent member comprising a modified water absorbent resin

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 3/28 (2006.01)

Patent

CA 2649299

This invention is to provide an absorbent member and a method for making such an absorbent member. The absorbent member comprises modified water absorbent having good production efficiency, good absorbency against pressure, good absorption speed, gel strength, good liquid permeability, and the like. The modified water absorbent resin is made by a method, which comprises (i) a mixing step comprising mixing a water absorbent resin, water, and a water-soluble radical polymerization initiator without addition of an ethylenically unsaturated monomer, to obtain a water absorbent resin composition, and (ii) an irradiating step comprising irradiating said water absorbent resin composition obtained in the mixing step with active energy rays, wherein the surface water content of said water absorbent resin in said water absorbent resin composition at least at any point of time in the irradiating step (ii) is controlled to a level of not lower than 3.0% by weight based on 100% by weight of the water absorbent resin. Preferably, the amount of water mixed in said step (i) exceeds 20 parts by weight and is not more than 100 parts by weight based on 100 parts by weight of the water absorbent resin.

L'invention porte sur un élément absorbant et sur son procédé de fabrication. L'élément absorbant comprend un absorbant l'eau modifié ayant un bon rendement, une bonne absorbance contre la pression, une bonne vitesse d'absorption, une force en gelée, une bonne perméabilité au liquide et autre. La résine modifiée absorbant l'eau, obtenue par ce procédé, comprend: (i) une étape de mélange consistant à mélanger une résine absorbant l'eau, de l'eau et un initiateur de polymérisation radical soluble dans l'eau sans l'ajout d'un monomère éthyléniquement insaturé pour obtenir une composition de résine absorbant l'eau; et (ii) une étape d'irradiation consistant à irradier la composition de résine absorbant l'eau obtenue au cours de l'étape de mélange avec des rayons d'énergie actifs, la teneur en eau de la surface de la résine absorbant l'eau de la composition, au moins à un moment quelconque de l'étape d'irradiation (ii), étant ajustée à un niveau qui n'est pas inférieur à 3,0 % en poids sur la base de 100 % en poids de la résine absorbant l'eau. De préférence, la quantité d'eau mélangée à l'étape (i) excède 20 parties en poids et n'est pas supérieure à 100 parties en poids sur la base de 100 parties en poids de la résine absorbant l'eau.

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