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13/427,617 entitled “Intraocular Lens Loading Systems and Methods of Use,” filed Mar. Baughman et al., “Negative poisson's ratios for extreme states fo matter,” Science, vol. By varying the ratio of phenyl containing cyclotrisiloxanes to methyl only containing cyclotrisiloxanes (that is, preparing a random block copolymer), the refractive index of the silicone oil can be varied between the refractive index of either pure homopolymer alone (i.e., between pure diphenyl polysiloxane and pure dimethyl polysiloxane).
In an example of an anionic synthetic route, the use of alkyl lithium compounds in the ring opening polymerization of cyclotrisiloxanes appears to be a “living” polymerization, allowing for the degree of control needed to make the silicone oils described above.
Purification Silicon oils can be purified in a variety of ways.
For example, a polymer with a large molecular weight distribution can be considered to be a mixture of a large number of compounds, and the properties of the material are some function of that distribution.
F.; Electricity can pump medicine in implanted medical devices; Ohio State Research News; 3 pgs.; May 2, 2002 (printed from internet Aug. Gruber et al.; Exhaustive soxhlet extraction for the complete removal of residual compounds . The term “living polymerization” implies a polymerization reaction that does not have a significant number of chain terminating or chain transferring side reactions.
A general class of polymer synthesis reactions known as “living polymerization reactions” can offer the degree of control necessary to assist in meeting some of the design requirements for a silicone oil.
The smaller quantity of the low molecular weight materials prepared minimizes the amount of purification that needs to occur later to remove them from the higher molecular weight products.
The feature of a narrow range of molecular weight products is also an advantage that can be realized in the preparation of silicone oils because fewer low molecular weight oligomers are made during the polymerization reaction.13/193,983 entitled “Accommodating Intraocular Lenses,” filed Jul. The silicone oil product may, however, be discolored on excessive heating when using wiped film evaporation. These oils are not used for IOLs, are particularly not in fluid-drive accommodating IDLs.