Patent ID: 7553417

Claim:
An article comprising: a porous base substrate having interstitial and outer surfaces, wherein the porous base substrate comprises a porous membrane, a porous nonwoven web, or a porous fiber; and grafted species extending from the surfaces of the porous base substrate, said grafted species being directly bonded to said surfaces of said porous base substrate via a graft polymerization reaction between (i) a free-radically polymerizable group of one or more grafting monomers and (ii) said surfaces of said porous base substrate; wherein (1) at least one of the grafted species comprises the reaction product of (a) an epoxy group of the one or more grafting monomers and (b) a nucleophilic compound comprising a polyalkylene glycol diamine or a polyalkylene glycol triamine, and (2) at least one of the grafted species comprises the reaction product of (a) a polyalkylene glycol di(meth)acrylate and (b) the surfaces of the porous base substrate.