Patent ID: 9527251
Filing Date: 2016-12-27
CPC Classification: B29D,B29K,C08F,C08G,G02B

Claim Text:
1. A method for manufacturing contact lenses comprising: (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 heating the mixture to form contact lenses; wherein the molecular weight of the siloxane macromer of formula (I) is 1,000 to 10,000: wherein R1, R2 and R3 are independently C1-C4 alkyl groups, R4 is C1-C6 alkyl group, R5 is a residue obtained by removing NCO group from an aliphatic or aromatic diisocyanate, R6 and R7 are independently alkylene groups, and n is an integer of 4-80, m is an integer of 3-40; wherein the formula (II) is represented as below; wherein p is an integer of 4-80 and q is an integer of 3-40; moreover, the hydrophilic monomer is selected from a group consisting of 2-hydroxyethyl methacrylate (HEMA), N-vinylpyrrolidone (NVP), methyl acrylic acid, acrylic acid, glycidyl methacrylate, (methyl)acrylamide N,N-dimethylacrylamide, vinyl bamate and a combination of said materials thereof.