Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1983-03-14
1984-12-11
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
351160R, 351160H, 526279, 528 31, 528 32, 525478, C08G 7706
Patent
active
044879059
ABSTRACT:
This invention provides novel compositions curable to resins and particularly provides oxygen permeable, inherently wettable optical devices useful as eye contact or intraocular lenses. The lenses are composed of a cured polysiloxane resin having an advancing water-in-air contact angle of no greater than 80.degree.. The polysiloxane resin is prepared from a catalyzed mixture of an acrylate-functional polysiloxane composition and an organosilicon cross-linking agent containing silicon hydride radicals. The acrylate-functional polysiloxane composition contains a sufficient amount of aliphatically unsaturated hydrocarbon radicals (e.g., vinyl radicals) other than acrylate-functional radicals to enable that composition to react on a mole to mole basis with the cross-linking agent to produce a cured polysiloxane resin. To provide the desired level of surface wettability, the acrylate-functional polysiloxane composition also contains an effective amount, typically from 7 to 30 mole percent of the total moles of siloxane units present in the cured polysiloxane resin, of H.sub.2 C.dbd.CRCOOR'SiO.sub.1.5 units to provide the aforementioned advancing water-in-air contact angles. The catalyzed mixture only contains a sufficient amount of cross-linking agent to react with the aliphatically unsaturated hydrocarbon radicals other than the acrylate-functional radicals and thus enables the unreacted acrylate-functional siloxane units to provide the desired wettability characteristics to the cured polysiloxane resin.
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Dow Corning Corporation
Marquis Melvyn I.
Rakoczy Richard E.
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