| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus and a method for facilitating the release of a silicone hydrogel ophthalmic lens from a mold part. SOLUTION: Upon releasing a silicone hydrogen lens from a mold part used for molding the silicone lens, a silicone hydrogen ophthalmic lens is released by exposing a monomer used to form the lens, that is a polymerized lens, to a polyether such as PEG (polyethylene glycol) or PEO (polyethylene oxide). Generally PEG and PEO are polymers that are the same in structure except for chain length and end groups. Polyethylene glycol refers to the polymer with molecular weight of less than 50,000 (a condensation polymer made from ethylene glycol), while polyethylene oxide is used for higher molecular weights (an addition polymer). PEG and PEO have different physical properties (i.e. viscosity) due to the chain length effect, however, their chemical properties are nearly identical. PEG methylether 2000 and PEG 2000 as embodiments can be particularly effective. COPYRIGHT: (C)2008,JPO&INPIT |
