| 摘要 |
An intraocular lens made from a class of optically clear, ultraviolet (UV) light absorbing, vulcanized silicone compositions containing about 35 mole % or greater phenyl groups (C6H5), suitable for implanting in the human eye is disclosed. The high mole percentage of phenyl groups in the vulcanized silicone compositions provides a high refractive index (at least about 1.50) and partially blocks ultraviolet light absorption. The composition is formed by the vulcanization of a mixture which comprises, for example, the following polyorganovinylsiloxane components:Component (I): alpha, omega-bis(trivinylsiloxy) oligodimethyldiphenylvinylmethylsiloxane;Component (II): alpha, omega-bis(trimethylsiloxy ) oligodimethyldiphenylmethylhydro-siloxane;andComponent (III): alpha, omega-bis(trimethylsiloxy) oligomethylphenylvinylmethylphenyl-siloxane;together with Component (IV) a polyaddition reation catalyst, particularly a complex platinum catalyst (for example, the complex of platinum and hexavinyldisiloxane); wherein the ratio, by weight, of the mixture in the four components (I:II:III:IV respectively) in the pre-vulcanized mixture is from about 0.9:0.1:0.015:0.006 to about 0.7:0.3:0.05:0.01. |
