Patent ID: 6533415
Filing Date: 2003-03-18
Classification: A61L,B29D,C08J,G02B

Abstract:
A process for preparing an ocular lens material having hydrophilic surface, characterized by comprising the steps of (1) irradiating the surface of an ocular lens material with high-frequency plasma or excimer ultraviolet-ray; (2) contacting the surface of the ocular lens material, which is treated in accordance with said step (1), with a hydrophilic monomer-mixture solution containing at least one zwitterionic group-containing compound; and (3) irradiating the surface of the ocular lens material, which is in the state of contacting with the hydrophilic monomer-mixture solution in said step (2), with ultraviolet-ray having a wavelength of 250 to 500 nm and then, graft polymerizing said zwitterionic group-containing compound to the surface of the ocular lens material and then, forming a surface layer.