Silicone-containing contact lens material and contact lenses made thereof
First Claim
1. A contact lens material comprising a polymer formed from polymerization of a mixture of from 20 to 50% by weight of a multifunctional, unsaturated, organosiloxane having the formula:
- ##STR5## WHEREIN;
Y'"'"' is an unsaturated polymerizable group selected from the group consisting of vinyl, methacryloxy, acryloxy, methacrylamido, acrylamido, styryl and allyl,X'"'"' is a divalent hydrocarbon having from 0 to 10 carbons,Y is an unsaturated polymerizable group selected from the group consisting of vinyl, methacryloxy, acryloxy, methacrylamido, acrylamido, styryl and allyl, or hydrogen,X is a divalent hydrocarbon having from 1 to 10 carbon atoms, or phenylene,A is selected from the group consisting of straight chain, branched chain, or cyclic alkyl groups having 1 to 5 carbon atoms, phenyl groups and "Z" groups,Z is a group selected from the following;
trimethyl siloxypentamethyl disiloxanylheptamethyl trisiloxanylnonamethyl tetrasiloxanylbis(trimethylsiloxy)methyl siloxanylTris(trimethylsiloxy) siloxanyl"a" is an integer from 0 to 10;
the total of "a" values is at least 2,"n" is an integer from 0 to about 10, and each of said X, X'"'"', Y, Y'"'"' a, A and Z groups being the same or different,combined with from 30 to 50% by weight of a monofunctional, unsaturated organosiloxane monomer having the formula;
##STR6## WHEREIN;
R is selected from the group consisting of methyl groups and hydrogen,"a" is an integer from 1 to 4,A is selected from the group consisting of straight chain, branched chain, or alkyl groups of from 1 to 5 carbon atoms, cyclohexyl groups, phenyl groups and Z groups,Z is a group selected from trimethyl siloxy, pentamethyl disiloxanyl, heptamethyl trisiloxanyl, nonamethyl tetrasiloxanyl, bis(trimethylsiloxy) methyl siloxanyl, tris(trimethylsiloxy) siloxanyl,"b" is an integer from 0 to 10, each "b", "A" and Z may be the same or different, and the total of "b" values being at least 1,and a hydrophilic cross-linking agent.
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Accused Products
Abstract
According to the invention contact lenses are formed of unsaturated, multifunctional, organosiloxanes alone or mixed with monofunctional organosilanes and in some cases a hardening agent such as methyl methacrylate, hydrophilic monomer wetting agents, and itaconate hydrophilic and hardening agents. In the preferred embodiment, an additional hydrophilic cross-linking agent is used and the multifunctional organosiloxane is less than 50% of the organosiloxane used. The multifunctional organosiloxane adds higher impact strength and reduces brittleness, probably due to greater cross-linking density in the final product and retains the desirable properties of silicone-containing materials for use in contact lenses.
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Citations
18 Claims
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1. A contact lens material comprising a polymer formed from polymerization of a mixture of from 20 to 50% by weight of a multifunctional, unsaturated, organosiloxane having the formula:
- ##STR5## WHEREIN;
Y'"'"' is an unsaturated polymerizable group selected from the group consisting of vinyl, methacryloxy, acryloxy, methacrylamido, acrylamido, styryl and allyl,X'"'"' is a divalent hydrocarbon having from 0 to 10 carbons, Y is an unsaturated polymerizable group selected from the group consisting of vinyl, methacryloxy, acryloxy, methacrylamido, acrylamido, styryl and allyl, or hydrogen, X is a divalent hydrocarbon having from 1 to 10 carbon atoms, or phenylene, A is selected from the group consisting of straight chain, branched chain, or cyclic alkyl groups having 1 to 5 carbon atoms, phenyl groups and "Z" groups, Z is a group selected from the following; trimethyl siloxy pentamethyl disiloxanyl heptamethyl trisiloxanyl nonamethyl tetrasiloxanyl bis(trimethylsiloxy)methyl siloxanyl Tris(trimethylsiloxy) siloxanyl "a" is an integer from 0 to 10;
the total of "a" values is at least 2,"n" is an integer from 0 to about 10, and each of said X, X'"'"', Y, Y'"'"' a, A and Z groups being the same or different, combined with from 30 to 50% by weight of a monofunctional, unsaturated organosiloxane monomer having the formula;
##STR6## WHEREIN;
R is selected from the group consisting of methyl groups and hydrogen,"a" is an integer from 1 to 4, A is selected from the group consisting of straight chain, branched chain, or alkyl groups of from 1 to 5 carbon atoms, cyclohexyl groups, phenyl groups and Z groups, Z is a group selected from trimethyl siloxy, pentamethyl disiloxanyl, heptamethyl trisiloxanyl, nonamethyl tetrasiloxanyl, bis(trimethylsiloxy) methyl siloxanyl, tris(trimethylsiloxy) siloxanyl, "b" is an integer from 0 to 10, each "b", "A" and Z may be the same or different, and the total of "b" values being at least 1, and a hydrophilic cross-linking agent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- ##STR5## WHEREIN;
- 17. A contact lens material for use in forming contact lenses, said material comprising a polymer formed from polymerization of a mixture of dimethyl itaconate, methylmethacrylate, methacrylic acid, N-vinyl-2-pyrrolidone, tetraethylene glycol dimethacrylate, and a mixture of 20 to 50% 1,3-Bis(-methacryloxypropyl)-1,1,3,3 tetra(trimethylsiloxy)disiloxane and 50 to 80% by weight of a monomer of methacryloxypropyltris (trimethylsilyl) siloxane.
Specification