Patent ID: 6346594
Filing Date: 2002-02-12
Classification: C08F,G02B

Abstract:
A process for producing an ocular lens material comprising a silicone compound, characterized by preparing a prepolymer of the silicone compound by copolymerizing a monomer mixture containing a monomer (A-1) having a group represented by the formula (IV): wherein R6 is an alkylene group having 1 to 20 carbon atoms, and R7 is a linear or branched alkyl group having 1 to 10 carbon atoms and a silicon-containing monomer, and reacting the prepolymer of the silicone compound with a compound (B-1) which can react with the monomer (A-1) and impart â€”POOâˆ’, â€”SOOâˆ’ or â€”COOâˆ’ to a silicone compound, to give the silicone compound having a zwitterionic group (I) represented by the formula (I): wherein R1 is hydrogen atom or a linear or branched alkyl group having 1 to 10 carbon atoms, in which two groups represented by R1 may be the same or different with each other, R2 is a linear or branched aliphatic hydrocarbon group having 1 to 12 carbon atoms or an aromatic hydrocarbon group, A1 is â€”Oâ€”, â€”Sâ€”, â€”NHâ€” or direct bond, A2 is A3 is â€”Oâ€”, â€”Sâ€”, â€”NHâ€” or &boxH;O, in which when A2 is â€”SOOâˆ’â€”, A1 and A3 are not â€”Sâ€”, and when A3 is &boxH;O, R2 is absent, and each of p and q is independently an integer of 1 to 20; or a zwitterionic group (II) represented by the formula (II): wherein R3 is hydrogen atom or a linear or branched alkyl group having 1 to 10 carbon atoms, in which two groups represented by R3 may be the same or different with each other, A4 is â€”Oâ€”, â€”Sâ€”, â€”NHâ€” or direct bond, and each of r, s and t is independently an integer of 1 to 20.