Durable hydrophilic coating for a porous hydrophobic polymer...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 7/04 (2006.01) A61F 13/15 (2006.01) A61L 15/28 (2006.01) A61L 15/42 (2006.01) B32B 5/26 (2006.01) C08J 9/36 (2006.01) C08J 9/40 (2006.01) D06M 10/02 (2006.01) D06M 10/10 (2006.01) D06M 15/03 (2006.01) D06M 15/05 (2006.01)

Patent

CA 2256388

A coated porous substrate composed of a hydrophobic polymer which is substantially uniformly coated with a hydrophilic polymeric material. The substrate may be a sheet-like material, examples of which are foams, fibers, and fibrous webs. The fibrous webs desirably will be nonwoven webs. The coating on the substrate is durable to an aqueous medium at a temperature in a range of from about 10 ~C to about 50 ~C and does not significantly suppress the surface tension of an aqueous medium with which the coated substrate may come in contact. The hydrophobic polymer may be a polyolefin, such as polyethylene or polypropylene. The hydrophilic polymeric material with which the polymer fibers are coated may be a polysaccharide or a modified polysaccharide. Also provided is a method of preparing a coated porous substrate which involves providing a porous substrate composed of a hydrophobic polymer. At least a portion of the substrate then is exposed to a field of reactive species. At least a portion of the porous substrate, including the portion exposed to the reactive species, is treated with a mixture which includes water and a hydrophilic polymeric material under conditions sufficient to substantially uniformly coat the porous substrate with the hydrophilic polymeric material.

Cette invention se rapporte à un substrat poreux enduit composé d'un polymère hydrophobe que l'on enduit de manière sensiblement uniforme d'une matière polymère hydrophile. Ledit substrat peut être constitué d'une matière en feuilles, du type mousses, fibres ou voiles fibreux. Lesdits voiles fibreux seront de préférence des non-tissés. L'enduit recouvrant ledit substrat est durable face à un milieu aqueux à une température comprise approximativement entre 10 ·C et 50 ·C et il ne supprime pas de manière significative la tension superficielle d'un milieu aqueux avec lequel le substrat recouvert pourrait entrer en contact. Ledit polymère hydrophobe peut être une polyoléfine, du type polyéthylène ou polypropylène. La matière polymère hydrophile avec laquelle on enrobe les fibres polymères peut être un polysaccharide ou un polysaccharide modifié. L'invention se rapporte également à un procédé de préparation d'un substrat poreux enduit qui s'applique à un substrat poreux composé d'un polymère hydrophobe. Ledit procédé consiste à exposer au moins une partie du substrat à un champ d'espèces réactives. On traite ensuite au moins une partie du substrat poreux incluant la partie exposée aux espèces réactives, avec un mélange comportant de l'eau et une matière polymère hydrophile dans des conditions suffisantes pour enduire de manière sensiblement uniforme le substrat poreux avec la matière polymère hydrophile.

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