Polymeric compositions useful in oxygen permeable contact lenses
First Claim
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1. A contact lens material formed from the free radical polymerization of a contact lens organic material and a carboxylic acid ester derived from at least one alcohol which is devoid of beta hydrogens in an amount predetermined to provide both a desired hardness value and oxygen permeability to said contact lens material, wherein said ester has the following formula:
- ##STR14## wherein A is selected from the group consisting of mesaconic acid, itaconic acid, citraconic acid, methylene malonate, maleic acid, fumaric acid, ethylene tricarboxylic acid, acrylic acid, and methacrylic acid,n=1, 2 or 3,R1, R2 and R3 are the same or different and each are alkyl, cycloalkyl or aryl groups having from 1 to 10 carbon atoms or ether groups having from 2 to 10 carbon atoms,where when A is derived from a dibasic or tribasic acid, the ester can be a full ester, half ester, partial ester or can be a mixed ester, said ester being derived from at least one alcohol which is devoid of beta hydrogens,said material having a Shore D hardness of at least 70 and a DK of at least 10.
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Abstract
Carboxylic acid esters devoid of beta hydrogens are homopolymerized or copolymerized with contact lens organic materials to form desirable contact lens materials and contact lenses. These materials have good contact lens properties, including desirable DK values, hardness, machineability and a desirable refractive index of at least 1.
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Citations
23 Claims
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1. A contact lens material formed from the free radical polymerization of a contact lens organic material and a carboxylic acid ester derived from at least one alcohol which is devoid of beta hydrogens in an amount predetermined to provide both a desired hardness value and oxygen permeability to said contact lens material, wherein said ester has the following formula:
- ##STR14## wherein A is selected from the group consisting of mesaconic acid, itaconic acid, citraconic acid, methylene malonate, maleic acid, fumaric acid, ethylene tricarboxylic acid, acrylic acid, and methacrylic acid,
n=1, 2 or 3, R1, R2 and R3 are the same or different and each are alkyl, cycloalkyl or aryl groups having from 1 to 10 carbon atoms or ether groups having from 2 to 10 carbon atoms, where when A is derived from a dibasic or tribasic acid, the ester can be a full ester, half ester, partial ester or can be a mixed ester, said ester being derived from at least one alcohol which is devoid of beta hydrogens, said material having a Shore D hardness of at least 70 and a DK of at least 10. - View Dependent Claims (2, 3, 4, 6, 14, 15, 16, 17)
- ##STR14## wherein A is selected from the group consisting of mesaconic acid, itaconic acid, citraconic acid, methylene malonate, maleic acid, fumaric acid, ethylene tricarboxylic acid, acrylic acid, and methacrylic acid,
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5. A contact lens material in accordance with C-aim 3, wherein said ester is a dicarboxylic ester selected from the group consisting of mesaconates, itaconates, citraconates, maleates, methylene malonates and fumarates.
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7. A contact lens formed substantially of an ester of the free radical polymerization product of a polymerizable carboxylic acid ester having the following formula:
- ##STR15## Wherein;
A is selected from the group consisting of mesaconic acid, itaconic acid, citraconic acid, methylene malonate, maleic acid, fumaric acid, ethylene tricarboxylic acid, acrylic acid, and methacrylic acid,n=1, 2, or 3 R1, R2 and R3 are the same or different and each are alkyl, cycloalkyl or aryl groups having from 1 to 10 carbon atoms or ether groups having from 2 to 10 carbon atoms, where when A is derived from a dibasic or tribasic acid, the ester can be a full ester, half ester, partial ester or can be a mixed ester, said ester being derived from at least one alcohol which is devoid of beta hydrogens, said lens having a Shore D hardness of at least 70 and a DK of at least 10 with a number average molecular weight of at least 50,000. - View Dependent Claims (8, 9, 10, 11, 12, 13)
- ##STR15## Wherein;
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18. A polymerized contact lens material formed by free radical polymerization of a wetting agent in an amount of from 1 to 10% by weight, a silicone methacrylate in an amount of from 0 to 60%, a crosslinking agent in an amount of 0 to 30% and dineopentyl itaconate in an amount of 10 to 80%.
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19. A polymerized contact lens material formed by free radical polymerization of methacrylic acid, n-vinyl pyrrolidone, methacryloyloxypropyl tris (trimethylsilyl) siloxane, tetraethylene glycol dimethacrylate, and dineopentyl itaconate.
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20. A polymerized contact lens material formed by free radical polymerization of a wetting agent 0-10% by weight, a crosslinking agent 0-30% by weight, a fluorinated itaconate 0-60% by weight, a fluorinated methacrylate 0-60% by weight, a silicone methacrylate 0-60% by weight, and dineopentyl itaconate 10-80% by weight.
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21. A polymerized contact lens material formed by free radical polymerization of methacrylic acid, n-vinyl pyrrolidone, neopentyl glycol dimethacrylate, methacryloyloxypropyl tris (trimethylsilyl) siloxane, bis-hexafluoro isopropyl itaconate, hexafluoroisopropylmethacrylate and dineopentyl itaconate.
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22. A polymerized contact lens material formed by free radical polymerization of a wetting agent 0-10% by weight, dineopentyl itaconate 10-80% by weight, a fluoroalkyl methacrylate 0-60% by weight, a fluoroalkyl itaconate 0-60% by weight, and a crosslinking agent 0-30% by weight.
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23. A polymerized contact lens material formed by free radical polymerization of n-vinyl pyrrolidone, dineopentyl itaconate, hexafluoro isopropyl methacrylate, bis-hexa fluoro isopropyl itaconate and neopentyl glycol dimethacrylate.
Specification