Methods and compositions for manufacturing tinted ophthalmic lenses
A pigmented, polymeric technology for eyeglasses/goggles, applications, home appliances, etc. that solves problems such as incomplete satisfaction
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Embodiment 1
[0103] Embodiment 1 (preparation of polymer precursor functionalizing agent) r)
[0104] 220 grams of sodium hydroxide were dissolved in 300 grams of water and 700 grams of ice in a 3 liter reactor with stirrer and cooling system. The sodium hydroxide solution was cooled to 10°C. 526 grams of aminoacetaldehyde dimethylacetal (aminoacetaldehyde dimethylacetal) and 50 mg of 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxide (free radical inhibitor) were added to in sodium hydroxide solution. 548.6 grams of methacryloyl chloride were slowly added to the 10°C solution over 3.5 hours. The pH dropped slowly to 7.2 when the addition was complete, and the amine could no longer be detected by gas chromatography. The mixture was extracted with 500 ml of petroleum ether, and in order to remove impurities, the aqueous phase was saturated with sodium chloride and extracted three times with 500 ml of tert-butyl methyl ether. The organic phase was dried over magnesium sulfate, filtered and ...
Embodiment 2
[0105] Example 2 (Preparation of Crosslinkable Polymer Precursor)
[0106] 300 grams of Mowiol 3-83 (polyvinyl alcohol from Hoechst) were added to a 2 liter double jacketed reactor with stirrer and thermometer. 800 grams of deionized water was added to the reactor and the aqueous mixture was heated to 95°C with stirring. After about one hour, a clear solution of PVA was produced. The solution was cooled to 20°C.
[0107] 27 g of methacrylamidoacetaldehyde dimethyl acetal functionalizing agent (from Example 1), 440 g of acetic acid, 100 g of concentrated hydrochloric acid (37%) and 333 g of deionized water were mixed to produce 2000 g of a reaction solution. The mixture was stirred at 20°C for 20 hours to produce crosslinkable polyvinyl alcohol. Changes in acetate content can be determined by titration with acetic acid.
Embodiment 3
[0108] Example 3 (purification of crosslinkable polymer precursors)
[0109] The crosslinkable PVA solution from Example 2 was dialyzed by means of ultrafiltration. Ultrafiltration was accomplished by using a 1-KD-Omega membrane produced by Filtron. Ultrafiltration was continued until a residual sodium chloride content of 0.004% was reached. Concentration of the dialyzed solution yielded 942 grams of a 30% crosslinkable PVA solution with an N-content of 0.672% (measured by the Kjeldahl assay), an acetate content of 1.516 meg / g (determined by hydrolysis), and a dynamic viscosity of 2000mPas, the amount of double bonds is 0.480meq / g (determined by microhydrogenation), the free hydroxyl group is 17.74meq / g (determined by heavy acetylation), molecular weight Mw=26200 and Mn=12300 (according to size exclusion chromatography in water determination).
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