Patent ID: 9108367
Filing Date: 2015-08-18
Classification: B29D,G02B

Abstract:
1. A method for manufacturing contact lenses comprising the steps of: (a) mixing a siloxane macromer represented by the following formula (I), a siloxane macromer represented by the following formula (II), a hydrophilic monomer, a crosslinking agent and an initiator to form a mixture; and (b) injecting the mixture into a mold of contact lens and conducting a UV irradiating treatment or a thermal treatment to the mixture to form contact lenses; wherein the siloxane macromer of formula and the siloxane macromer of formula (II) are: where, in formula (I), R1, R2 and R3 are independently C1-C4 alkyl groups and m is an integer of 10-40, and in formula (II), R4, R5 and R6 are independently C1-C4 alkyl groups or alcohol groups, R7 is a C1-C4 alkyl group and n is an integer of 10-130; and the hydrophilic monomer is selected from the group consisting of N-vinylpyrrolidone (NVP), 2-hydroxyethyl methacrylate (HEMA), dimethylaminoethyl methacrylate (DMA), glycerol monomethacrylate (GMMA), methyl acrylic acid (MAA), methyl methacrylate (MMA), glycidyl methacrylate (GMA), acrylic acid, (methyl) acrylamide, N,N-dimethylacrylamide, ethylene carbonate, vinyl bamate and a combination thereof.