HIGH REFRACTIVE INDEX SILICONE COMPOSITIONS

摘要

Organosiloxane compositions curable to optically clear, high refractive index elastomers are disclosed. The cured compositions have superior post-folding high resolution recovery making them suitable for fabricating foldable intraocular lenses used in small-incision ophthalmic surgeries. The organosiloxane compositions include first and second vinyl terminated organosiloxanes of about 18 mole % diphenylsiloxane and about 82 mole % dimethylsiloxane, fumed silica, crosslinking reagent, platinum containing catalyst, and optional ultraviolet absorbing compounds. The first and second vinyl terminated organosiloxanes differ in molecular weight resulting in a bimodal molecular weight distribution in the compositions.