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US 4,534,916 AGranted
Method for the preparation of hydrophilic gels by monomer casting
AssigneeCeskoslovenska
InventorOtto Wichterle
Life of this patent
Estimating the term…
Abstract
Hydrogels, e.g. hydrogel contact lens are prepared by casting, preferably spin casting, hydrophilic gels in a plastic mold, preferably polypropylene in the presence of a surface active agent.
Claims19
In a process of preparing a hydrophilic gel article by monomer cast polymerization of a mixture containing a monoolefinic hydrophilic monomer in a plastic mold the improvement comprising including in the polymerizable monomer mixture a surface active agent in an amount effective to prevent grafting of the hydrophilic gel on the plastic mold.
Dependencies are inferred from the claim text.