Process for radiation grafting hydrogels onto organic polymeric substrates
AssigneeThe United States of America as represented by the United States Energy Research and Development Administration
InventorsBuddy D. Ratner, Allan S. Hoffman
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Abstract
An improved process for radiation grafting of hydrogels onto organic polymeric substrates is provided comprising the steps of incorporating an effective amount of cupric or ferric ions in an aqueous graft solution consisting of N-vinyl-2 - pyrrolidone or mixture of N-vinyl-2 - pyrrolidone and other monomers, e.g., 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, propylene glycol acrylate, acrylamide, methacrylic acid and methacrylamide, immersing an organic polymeric substrate in the aqueous graft solution and thereafter subjecting the contacted substrate with ionizing radiation.
Claims7
In a method for radiation grafting hydrogels onto an organic substrate selected from the group consisting of silicone rubber, polyurethane, polyvinyl chloride, and polyurethane-polyether copolymers wherein the substrate is immersed in an aqueous polymer graft solution and thereafter subjected to ionizing radiation, the improvement comprising adding an amount of cupric or ferric ions within the concentration range of 0.0008 M to 0.0016 M to an aqueous graft solution consisting of N-vinyl-2-pyrrolidone monomer or mixtures of N-vinyl-2-pyrrolidone and a second monomer selected from the group consisting of 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, propylene glycol acrylate, acrylamide, methacrylic acid, and methacrylamide, wherein the N-vinyl-2-pyrrolidone constitutes from 1/20 to 18/20 by volume of said mixture, said aqueous graft solution comprising a total monomer content in the range of 4 to 40% by volume.
Dependencies are inferred from the claim text.