Method for the modification of polyvinylidene fluoride

A graft polymer of polyvinylidene fluoride wherein the polyvinylidene fluoride has grafted thereon at least 0.5 percent by weight and up to 98 percent by weight of a polymer of methylmethacrylate and said graft polymer is insoluble in tetrahydrofuran prepared by contacting in the solid phase polyvinylidene fluoride with methylmethacrylate and diffusing said methylmethacrylate and a radical forming catalyst into said polyvinylidene fluoride in such an amount that said polyvinylidene fluoride remains in the solid phase and thereafter maintaining said polyvinylidene fluoride in the solid phase under polymerization conditions for said methylmethacrylate and polymerizing said methylmethacrylate in the absence of water and/or solvent.

A graft polymer of polyvinylidene fluoride when the polyvinylidene fluoride has grafted thereon at least 0.5 percent by weight and up to 98 percent by weight of a polymer of an ethylenically unsaturated compound which graft polymer is resistant to solvents for polymethacrylic compounds prepared by contacting in the solid phase polyvinylidene fluoride with a monomer of an ethylenically unsaturated compound and diffusing said monomer and a radical forming catalyst into said polyvinylidene fluoride in such an amount that said polyvinylidene fluoride remains in the solid phase and thereafter maintaining said polyvinylidene fluoride in the solid phase under polymerization conditions for said ethylenically unsaturated compound and polymerizing said ethylenically unsaturated compound in the absence of water and/or solvent.

A graft polymer of polyvinylidene fluoride when the polyvinylidene fluoride has grafted thereon at least 0.5 percent by weight and up to 98 percent by weight of a polymer of an ethylenically unsaturated compound which graft polymer is resistant to tetrahydrofuran prepared by contacting the solid phase polyvinylidene fluoride with a monomer of ethylenically unsaturated compound and diffusing said monomer and a radical forming catalyst into said polyvinylidene fluoride in such an amount that said polyvinylidene fluoride remains in solid phase and thereafter maintaining said polyvinylidene fluoride in the solid phase under polymerization conditions for said ethylenically unsaturated compound and polymerizing said ethylenically unsaturated compound in the absence of water and/or solvent.