Long-wearable soft contact lens

Abstract

The present invention relates to a soft contact lens, and provides a contact lens which shows small and stable contact angle to water at its surface in water as well as in air, little deposition in wearing, high oxygen permeability, no adhesion of lens to a cornea and superior extended-wearing characteristics. The present invention provides a hydrogel soft contact lens which has contact angle at a lens surface in a range of 10-50° by the captive bubble method in water and 30-90° by the sessile drop method in air, oxygen permeability of not less than 30 and water content of not less than 5%, and also a hydrogel soft contact lens consisting of a polymer comprising a hydrophilic siloxanyl monomer shown by a specified general formula.

What is claimed:  
     
         1 . A mold for producing a contact lens, which mold is capable of forming both front and rear surfaces of said contact lens from a surface of said mold during polymerization of a monomer composition in said mold and comprises a resin selected from the group consisting of nylon 66 and nylon 6, polyethylene terephthalate and ethylene-vinylalcohol copolymer.  
     
     
         2 . A mold for producing a contact lens, which mold is capable of forming both front and rear surfaces of said contact lens from a surface of said mold during polymerization of a monomer composition in said mold and comprises a resin comprising ethylene-vinylalcohol copolymer.  
     
     
         3 . The mold according to  claim 1 , wherein said contact lens is a contact lens with contact angle of a surface in a range of 10-50° and 30-90° by the captive bubble method in water and the sessile drop method in air, respectively, oxygen permeability of not less than a dK value of 30 and water content of not less than 5% by weight.  
     
     
         4 . A mold for producing a contact lens according to  claim 1 , wherein said contact lens is a hydrogel soft contact lens manufactured by a polymerization of at least one kind of siloxane monomer.  
     
     
         5 . A mold for producing a contact lens according to  claim 1 , wherein said contact lens is a hydrogel soft contact lens manufactured by a copolymerization of at least one kind of hydrophilic polysiloxane monomer of the formula (1) and at least one kind of a hydrophilic monomer:  
       
         
           
           
               
               
           
         
         wherein, X1 is a polymerizable substituent shown by the following formula (2);  
         
           
             
             
                 
                 
             
           
         
         wherein, R5 is a hydrogen or a methyl group; Z1 is a linking group selected from —NHCOO—, —NHCONH—, —OCONH—R6-NHCOO—, —NHCONH—R7-NHCONH— and —OCONH—R8-NHCONH— (R6, R7 and R8 are hydrocarbon groups with 2-13 carbon atoms); m is 0-10; n is 3-10; p is 0 when m is 0 and 1 when m is not less than 1; q is an integer of 0-20; R1, R2, R3 and R4 are groups independently selected from hydrocarbon groups with 1-12 carbon atoms or trimethylsiloxy group; and the structure [Y1] shows a polysiloxane backbone-comprising not less than 2 siloxane linkages.  
       
     
     
         6 . A mold for producing a contact lens according to  claim 2 , wherein said contact lens is a contact lens manufactured by a copolymerization of at least a kind of siloxane group-containing monomer and at least one kind of hydrophilic monomer.