Oxygen permeable contact lens material comprising copolymers of multifunctional siloxanyl alkylesters

Claim 2

An oxygen permeable material for the manufacture of contact lenses formed by copolymerizing (a) from 5 to 90% by weight of a multifunctional siloxanyl alkyl ester, monomer having two or more α, ω terminally bonded through divalent hydrocarbon groups to an activated unsaturated group, (b) an effective amount of a copolymerizable monomer up to 90% by weight of an ester of acrylic or methacrylic acid or mixture thereof, or from (c) an effective amount of a copolymerizable monomer up an ester of itaconic acid, (d) from 0.5 to 40% by weight of a hydrophilic monomer for a surface wetting agent, and (e) from 0 to 20% by weight of an ester crosslinking agent in the presence of a free radical or a photo initiator.

Claim 3

A composition as defined in claim 1 wherein said multifunctional siloxanyl alkyl ester monomer having two or more α, ω terminally bonded through divalent hydrocarbon groups to an activated unsaturated groups; includes at least one of the following group: tetrakis-(trimethylsiloxy)bis(methacryloxypropyl)disiloxane tetrakis-(trimethylsiloxy)bis(methacryloxypropyl)dimethyltrisiloxane pentakis-(trimethylsiloxy)tris(methacryoxypropyl)tetramethyl-pentasiloxane hexakis-(trimethylsiloxy)tetrakis-(methacryloxpropyl)-hexamethyl heptasiloxane tris-(methacryloxymethyldimethylsiloxy)methacryloxypropylsiloxane tetrakis-(methacryloxymethyldimethylsiloxy)tetramethylcyclotetra-siloxane tetrakis-(methacryloxymethyldimethylsiloxy)siloxane.

Claim 4

A composition as defined in claim 1 wherein said ester of acrylic or methacrylic acid include at least one of the following group: butyl acrylate, butyl methacrylate cyclohexyl acrylate, cyclohexyl methacrylate 2-ethylacrylate, 2-ethylmethacrylate glycidyl acrylate, glycidyl methacrylate hexyl acrylate, hexyl methacrylate lauryl acrylate, lauryl methacrylate methyl acrylate, methyl methacrylate stearyl acrylate, stearyl methacrylate.

Claim 5

A composition as defined in claim 1 wherein said ester of itaconic acid include at least one of the following group: butyl itaconate dibutyl itaconate methyl itaconate dimethyl itaconate phenyl itaconate diphenyl itaconate.

Claim 6

A composition as defined in claim 1 wherein said a hydrophiliomonomer for a surface wetting agent include at least one of the following group: acrylamide 2-acrylamido-2 methyl propane sulfonic acid t-butylaminoethyl methacrylate dimethylaminoethylacrylate, dimethylaminoethylmethacrylate N-(1,1-dimethyl-3-oxobutyl)acrylamide glacial acrylic acid, glacial methacrylic acid glyceryl acrylate, glyceryl methacrylate itaconic acid propylene glycolmonoacrylate, propylene glycol monomethacrylate ethylene glycol monoacrylate, ethylene glycol monomethacrylate methacrylamide morpholinoethyl acrylate, morphilinoethyl methacrylate piperidinoethyl acrylate, piperidinoethyl methacrylate triethylene glycol methacrylate N-vinyl pyrrolidone dihydroxypropyl acrylate, dihydroxypropyl methacrylate.

Claim 7

A composition as defined in claim 1 wherein said an ester crosslinking agent include at least one of the following group: bis(methacryloxypropyl)tetramethyldisiloxane 1,3 bis(glycidoxypropyl)tetramethyldisiloxane divinyl diphenyl silane ethylene glycol diacrylate, ethylene glycol dimethacrylate diethylene glycol dicacrylate, diethylene glycol dimethacrylate trimethylpropane triacrylate, trimethylpropane trimethacrylate triethylene glycol diacrylate, triethylene glycol dimethacrylate tetraethylene glycol diacrylate, tetraethylene glycol dimethacrylate.