초록 ▼

A polyvinylidene difluoride structure with a critical surface energy of at least about 80 dynes/cm and a method of making such a structure comprising the steps of contacting a polyvinylidene difluoride structure with an alkalized solution, such as potassium hydroxide, to form activated sites on the

A polyvinylidene difluoride structure with a critical surface energy of at least about 80 dynes/cm and a method of making such a structure comprising the steps of contacting a polyvinylidene difluoride structure with an alkalized solution, such as potassium hydroxide, to form activated sites on the surface of the structure; rinsing the activated structure to remove residual alkali; contacting the rinsed, activated structure with a solution of a polymerization initiator, such as potassium peroxydisulfate, and a polymerizable vinylic monomer, such as acrylic acid; and polymerizing and grafting the monomer to the activated structure to form a polyvinylidene difluoride structure with a critical surface energy of at least about 80 dynes/cm.

대표청구항 ▼

A polyvinylidene difluoride structure with a high critical surface energy comprising a polyvinylidene difluoride porous membrane or fibrous web substrate having grafted thereto a polymer derived at least in part from polymerizable vinylic monomer having the formula: [Figure] wherein R is H, an amino

A polyvinylidene difluoride structure with a high critical surface energy comprising a polyvinylidene difluoride porous membrane or fibrous web substrate having grafted thereto a polymer derived at least in part from polymerizable vinylic monomer having the formula: [Figure] wherein R is H, an aminoalkyl or quaternized aminoalkyl group having 1 to 3 carbon atoms, or a hydroxy alkyl group having 1 to 3 carbon atoms; R′, R″and R″′independently are H, and alkyl group having 1 to 3 carbon atoms, a carboxyl group (－COOH), a carboxyalkyl group having 1 to 3 carbon atoms, or a hydroxyalkyloxycarbonyl group having 1 to 3 carbon atoms, said polymer including functional groups sufficiently polar or ionic that said structure has a critical surface energy of at least about 80 dynes/cm and said polyvinylidene difluoride substrate prior to grafting having activated sites formed on the surface.