Surface modification of hydrophobic polymer substrate

C - Chemistry – Metallurgy – 08 – J

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C08J 7/04 (2006.01) D06M 15/333 (2006.01) D06M 23/10 (2006.01)

Patent

CA 2207296

A method for coating the surface of a substrate composed of a hydrophobic polymer with a hydrophobic vinyl polymer. The method includes preparing a solution of the hydrophobic vinyl polymer in a polar nonaqueous solvent, such as 1-methyl-1-pyrrolidinone, in which the hydrophobic vinyl polymer is surface-active. The substrate then is treated with the solution under conditions sufficient to deposit the hydrophobic vinyl polymer on the substrate. The hydrophobic vinyl polymer may have readily hydrolyzable pendant groups which, upon hydrolysis thereof in an aqueous medium, will result in the formation of a hydrophilic vinyl polymer coating on the substrate. For example, the hydrophobic vinyl polymer may be poly(vinyl trifluoroacetate). Also provided are coated substrates, in which the substrate is a shaped article composed of a hydrophobic polymer. The shaped article may be, for example, a film, fiber, or nonwoven web.

Une méthode de revêtement de la surface d'un substrat composé d'un polymère hydrophobe avec un polymère vinylique hydrophobe. La méthode comprend la préparation d'une solution du polymère vinylique hydrophobe dans un solvant polaire non aqueux, comme la 1-méthyl-1-pyrrolidinone, dans lequel le polymère vinylique hydrophobe est tensio-actif. Le substrat est ensuite traité avec la solution dans des conditions suffisantes pour permettre le dépôt du polymère vinylique hydrophobe sur le substrat. Le polymère vinylique hydrophobe peut porter des groupes pendants facilement hydrolysables qui, après leur hydrolyse dans un milieu aqueux, entraîneront la formation d'un revêtement de polymère vinylique hydrophile sur le substrat. Par exemple, le polymère vinylique hydrophobe peut être du poly(trifluoroacétate de vinyle). L'invention décrit également des substrats revêtus, dans lesquels le substrat est un objet formé composé d'un polymère hydrophobe. L'objet formé peut être, par exemple, une pellicule, une fibre ou un non-tissé.

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