Photochromic polydiorganosiloxane vinylic crosslinkers
a polydiorganosiloxane vinylic crosslinker and photochromic technology, applied in the field of photochromic polydiorganosiloxane vinylic crosslinkers, can solve the problems of limited compatibility between known polymerizable photochromic compounds and polymerizable components, limited compatibility, and still susceptible to hydrolysis
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example 1
Oxygen Permeability Measurements
[0296]Unless specified, the oxygen transmissibility (Dk / t), the intrinsic (or edge-corrected) oxygen permeability (Dki or Dkc) of a lens and a lens material are determined according to procedures described in ISO 18369-4.
Equilibrium Water Content
[0297]The equilibrium water content (EWC) of contact lenses are determined as follows.
[0298]Amount of water (expressed as percent by weight) present in a hydrated hydrogel contact lens, which is fully equilibrated in saline solution, is determined at room temperature. Quickly stack the lenses, and transfer the lens stack to the aluminum pan on the analytical balance after blotting lens in a cloth. The number of lenses for each sample pan is typically five (5). Record the pan plus hydrated weight of the lenses. Cover the pan with aluminum foil. Place pans in a laboratory oven at 100±2° C. to dry for 16-18 hours. Remove pan plus lenses from the oven and cool in a desiccator for at least 30 minutes. Remove a sing...
example 2
[0302]A polydiorganosiloxane vinylic crosslinker having pendant reactive functional groups (e.g., primary amino groups) is prepared according to the procedures shown in Scheme 1
Synthesis of the Precursor
[0303]275.9 g of octamethylcyclotetrasiloxane (M.W. 296.62), 12.0 g of 1,3,5,7-tetramethylcyclotetrasiloxane (M.W. 240.51), 15.3 g of 1,3-bis(3-methacryloxypropyl) tetramethyldisiloxane (M.W. 386.63), and 0.9 g of trifluoromethanesulfonic acid (M.W. 150.08) are weighed into a 500 mL round bottom flask. After the reaction is run at 35° C. for 24 h, 170 mL of 0.5% sodium hydrogen carbonate is added. The collected organic portion is further extracted five times with de-ionized water (170 mL per cycle). Anhydrous MgSO4 is added to the collected organic solution, followed by ˜350 mL of additional CHCl3, and the solution is then stirred overnight. After filtration, the solvent is removed via Rotovap, followed by high vacuum. 102 g of final product (the precursor) is obtained.
Hydrosilylatio...
example 3
[0305]A photochromic polydiorganosiloxane vinylic crosslinker is prepared according to the procedures shown in Scheme 2.
[0306]4.87 g of polydiorganosiloxane vinylic crosslinker with pendant aminopropyl groups (1 eq amine), 2.33 g of 3,3-bis(4-methoxyphenyl)-6,11-dimethyl-13-(2-hydroxycarbonylethyl)carboxyethoxy-13-phenyl-3H,13H-indeno [2′,3′:3,4]naphtho[1,2-b]pyran (5 eq), 0.96 g of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC), 0.76 of N,N-dimethylaminopyridine (DMAP), 50 mL of dichloromethane (DCM) are added into a 500 mL round bottom flask.
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