Wettable silicone resin optical devices and curable compositions therefor
First Claim
1. A curable polysiloxane composition consisting essentially of(A) 100 parts by weight of an acrylate-functional polysiloxane composition containing acrylate-functional siloxane units of the unit formula H2 C═
- CROOR'"'"'SiO1.5 where R is a methyl radical or hydrogen and R'"'"' is a divalent alkylene radical of from 1 to 4 inclusive carbon atoms and containing siloxane units possessing aliphatically unsaturated hydrocarbon radicals selected from the group consisting of vinyl, allyl and butenylene radicals, the remaining silicon-bonded substituents in addition to divalent oxygen radicals present in said polysiloxane essentially being selected from the group consisting of alkyl radicals of from 1 to 3 inclusive carbon atoms and phenyl radicals,(B) an amount of an organosilicon cross-linking agent containing an average of at least two silicon-bonded hydrogen radicals per molecule, said amount being no greater than that required to provide a 1;
1 mole ratio of silicon-bonded hydrogen radicals to total moles of said aliphatically unsaturated hydrocarbon radicals present in (A), essentially any remaining substituents in addition to divalent oxygen radicals present in said agent being selected from the group consisting of alkyl radicals of from 1 to 3 inclusive carbon atoms and phenyl radicals, and(C) a catalytic amount of a Group 8 Transition Metal catalyst which preferentially catalyzes the addition of said silicon-bonded hydrogen radicals to said aliphatically unsaturated hydrocarbon radicals instead of the >
C═
C<
portion of the acrylate-functional siloxane units, there being at least a sufficient amount of said aliphatically unsaturated hydrocarbon radicals in (A) such that when the mixture of (A), (B) and (C) is cured to form a resin, said resin possesses a flexural strength value of at least 3,500 p.s.i. at 21°
±
2°
C. in the unhydrated state, there further being an effective amount of said acrylate-functional siloxane units present in (A) such that the cured resin possesses an advancing water-in-air contact angle of no greater than 80°
at 21°
±
2°
C. in the hydrated state and wherein less than 30 mole percent of the total moles of silicon atoms present in (A) and (B) are derived from said acrylate-functional siloxane units.
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Accused Products
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°. 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 H2 C═CRCOOR'"'"'SiO1.5 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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Citations
20 Claims
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1. A curable polysiloxane composition consisting essentially of
(A) 100 parts by weight of an acrylate-functional polysiloxane composition containing acrylate-functional siloxane units of the unit formula H2 C═ - CROOR'"'"'SiO1.5 where R is a methyl radical or hydrogen and R'"'"' is a divalent alkylene radical of from 1 to 4 inclusive carbon atoms and containing siloxane units possessing aliphatically unsaturated hydrocarbon radicals selected from the group consisting of vinyl, allyl and butenylene radicals, the remaining silicon-bonded substituents in addition to divalent oxygen radicals present in said polysiloxane essentially being selected from the group consisting of alkyl radicals of from 1 to 3 inclusive carbon atoms and phenyl radicals,
(B) an amount of an organosilicon cross-linking agent containing an average of at least two silicon-bonded hydrogen radicals per molecule, said amount being no greater than that required to provide a 1;
1 mole ratio of silicon-bonded hydrogen radicals to total moles of said aliphatically unsaturated hydrocarbon radicals present in (A), essentially any remaining substituents in addition to divalent oxygen radicals present in said agent being selected from the group consisting of alkyl radicals of from 1 to 3 inclusive carbon atoms and phenyl radicals, and(C) a catalytic amount of a Group 8 Transition Metal catalyst which preferentially catalyzes the addition of said silicon-bonded hydrogen radicals to said aliphatically unsaturated hydrocarbon radicals instead of the >
C═
C<
portion of the acrylate-functional siloxane units, there being at least a sufficient amount of said aliphatically unsaturated hydrocarbon radicals in (A) such that when the mixture of (A), (B) and (C) is cured to form a resin, said resin possesses a flexural strength value of at least 3,500 p.s.i. at 21°
±
2°
C. in the unhydrated state, there further being an effective amount of said acrylate-functional siloxane units present in (A) such that the cured resin possesses an advancing water-in-air contact angle of no greater than 80°
at 21°
±
2°
C. in the hydrated state and wherein less than 30 mole percent of the total moles of silicon atoms present in (A) and (B) are derived from said acrylate-functional siloxane units. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- CROOR'"'"'SiO1.5 where R is a methyl radical or hydrogen and R'"'"' is a divalent alkylene radical of from 1 to 4 inclusive carbon atoms and containing siloxane units possessing aliphatically unsaturated hydrocarbon radicals selected from the group consisting of vinyl, allyl and butenylene radicals, the remaining silicon-bonded substituents in addition to divalent oxygen radicals present in said polysiloxane essentially being selected from the group consisting of alkyl radicals of from 1 to 3 inclusive carbon atoms and phenyl radicals,
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11. As an optical device, a lens to be worn against or inside of the eye, said lens consisting essentially of an optically clear, biocompatible, cured polysiloxane resin having a flexural strength value of at least 3,500 p.s.i. at 21°
- ±
2°
C. in the unhydrated state, an advancing water-in-air contact angle of no greater than 80°
at 21°
±
2°
C. in the hydrated state and an oxygen gas permeability coefficient of at least 2×
10-10 (cm3.cm)/(cm2.sec.cm Hg) which results in a calculated open eye Equivalent Oxygen Performance value of at least 3 percent at 0.1 mm thickness at 21°
±
2°
C., said resin having been prepared by curing a composition consisting essentially of(A) 100 parts by weight of an acrylate-functional polysiloxane composition containing acrylate-functional siloxane units of the unit formula H2 C═
CROOR'"'"'SiO1.5 where R is a methyl radical or hydrogen and R'"'"' is a divalent alkylene radical of from 1 to 4 inclusive carbon atoms and containing siloxane units possessing aliphatically unsaturated hydrocarbon radicals selected from the group consisting of vinyl, allyl and butenylene radicals, the remaining silicon-bonded substituents in addition to divalent oxygen radicals present in said polysiloxane essentially being selected from the group consisting of alkyl radicals of from 1 to 3 inclusive carbon atoms and phenyl radicals,(B) an amount of an organosilicon cross-linking agent containing an average of at least two silicon-bonded hydrogen radicals per molecule, said amount being no greater than that required to provide a 1;
1 mole ratio of silicon-bonded hydrogen radicals to total moles of said aliphatically unsaturated hydrocarbon radicals present in (A), essentially any remaining substituents in addition to divalent oxygen radicals present in said agent being selected from the group consisting of alkyl radicals of from 1 to 3 inclusive carbon atoms and phenyl radicals, and(C) a catalytic amount of a Group 8 Transition Metal catalyst which preferentially catalyzes the addition of said silicon-bonded hydrogen radicals to said aliphatically unsaturated hydrocarbon radicals instead of the >
C═
C<
portion of the acrylate-functional siloxane units, there being at least a sufficient amount of said aliphatically unsaturated hydrocarbon radicals in (A) such that when the mixture of (A), (B) and (C) is cured to form a resin, said resin possesses the aforementioned flexural strength value, there further being an effective amount of said acrylate-functional siloxane units present in (A) such that the cured resin possesses the aforementioned water-in-air contact angle and is inherently wettable by the tear fluid of a wearer of such a lens and wherein less than 30 mole percent of the total moles of silicon atoms present in (A) and (B) are derived from said acrylate-functional siloxane units. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
- ±
Specification