WO2011071790A1 - Procédés pour augmenter la perméabilité ionique de lentilles de contact - Google Patents

Procédés pour augmenter la perméabilité ionique de lentilles de contact Download PDF

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WO2011071790A1
WO2011071790A1 PCT/US2010/059021 US2010059021W WO2011071790A1 WO 2011071790 A1 WO2011071790 A1 WO 2011071790A1 US 2010059021 W US2010059021 W US 2010059021W WO 2011071790 A1 WO2011071790 A1 WO 2011071790A1
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lens
vinyl
acrylamide
propyl
bis
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PCT/US2010/059021
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English (en)
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Yongxing Qiu
Xinming Qian
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Novartis Ag
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Priority to CN2010800554394A priority Critical patent/CN102639636A/zh
Priority to EP10836461A priority patent/EP2510051A1/fr
Publication of WO2011071790A1 publication Critical patent/WO2011071790A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/041—Lenses
    • G02B1/043—Contact lenses

Definitions

  • This invention is related to a method for making silicone hydrogel contact lenses with increased ion permeability.
  • a silicone hydrogel contact lens allows sufficient oxygen to permeate through the lens to the cornea with minimal adverse effects on corneal health.
  • on-eye movement of the lens is also required to ensure good tear exchange, and ultimately, to ensure good corneal health.
  • Ion permeability is one of the predictors of on-eye movement, because the permeability of ions is believed to be directly proportional to the permeability of water. The methods described herein produce ophthalmic lenses having improved ion permeability without adversely affecting other properties of the lens.
  • IP-enhancing ion-permeability-enhancing hydrophilic vinylic monomer or macromer
  • a lens-forming material for cast-molding silicone hydrogel contact lenses wherein the IP-enhancing vinylic monomer or macromer is represented by formula I;
  • X is a direct bond, an oxygen atom (-0-) or— N— 5 wherein R' is H or Q-
  • L is a direct bond, a linear or branched Cj-Cio alkylene divalent radical (or so-called divalent aliphatic hydrocarbon radical), or a divalent radical of -X 3 -E-X 4 -, wherein X 3 and R'
  • X 4 are, independently, a linkage selected from the group consisting of -0-, — N— ,
  • E is an alkylene divalent radical, a cycloalkyl diradical, an alkylcycloalkyl diradical, an alkylaryl diradical, or an aryl diradical with up to 40 carbon atoms, wherein E optionally can have ether, thio, or amine linkages in the main chain;
  • Y is -(R'-0) n -(R 2 -0)m-( 3 -0)p-R, wherein R 1 , R 2 , and R 3 are, independently, a linear or branched C 2 -C 4 -alkylene, and n, m and p are, independently, a number from 0 to 100, wherein the sum of (n+m+p) is 2 to 100, and R is hydrogen, a C 1 -C4 alkyl or alkoxy radical, and
  • Z is hydrogen or methyl
  • a lens is obtained by curing the lens-forming material in a mold to form the lens and removing the lens from the mold.
  • the resultant lens has an increased ion permeability compared to a control lens produced from a lens-forming material having identical composition except without the IP-enhancing vinylic monomer or macromer of the formula I.
  • alkyl as used herein is a branched or unbranched saturated hydrocarbon group of 1 to 24 carbon atoms, such as methyl, ethyl, ⁇ -propyl, isopropyl, rc-butyl, isobutyl, t-butyl, pentyl, hexyl, heptyl, octyl, decyl, tetradecyl, hexadecyl, eicosyl, tetracosyl and the like.
  • a "lower alkyl” group is an alkyl group containing from one to six carbon atoms.
  • amino group as used herein has the formula -NRR', where R and R' are, independently, hydrogen, an alkyl group, or an aryl group.
  • alkylene refers to a divalent radical of hydrocarbon.
  • cycloalkyl group is a non-aromatic carbon-based ring composed of at least three carbon atoms.
  • examples of cycloalkyl groups include, but are not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc.
  • heterocycloalkyl group is a cycloalkyl group as defined above where at least one of the carbon atoms of the ring is substituted with a heteroatom such as, but not limited to, nitrogen, oxygen, sulphur, or phosphorus.
  • the cycloalkyl group can be substituted or unsubstituted.
  • the cycloalkyl group can be substituted with one or more groups including, but not limited to, alkyl, alkynyl, alkenyl, aryl, halide, nitro, amino, ester, ketone, aldehyde, hydroxy, carboxylic acid, or alkoxy.
  • aryl as used herein is any carbon-based aromatic group including, but not limited to, benzene, naphthalene, etc.
  • aromatic also includes "heteroaryl group,” which is defined as an aromatic group that has at least one heteroatom incorporated within the ring of the aromatic group. Examples of heteroatoms include, but are not limited to, nitrogen, oxygen, sulfur, and phosphorus.
  • the aryl group can be substituted or unsubstituted.
  • the aryl group can be substituted with one or more groups including, but not limited to, alkyl, alkynyl, alkenyl, aryl, halide, nitro, amino, ester, ketone, aldehyde, hydroxy, carboxylic acid, or alkoxy.
  • alkylene oxide as used herein is a group composed of one or more repeat units having the formula -(R a ) n O-, where R a is a linear or branched Ci-C4-alkylene and n is from 1 to 10.
  • alkylene amine as used herein is a group composed of one or more repeat units having the formula -(R a ) n NR-, where R a is a linear or branched C]-C4-alkylene, n is from 1 to 10, and R is hydrogen, an alkyl group, or an aryl group.
  • the carbonyl group can be present as an aldehyde, ketone, ester, anhydride, or carboxylic acid group.
  • silicon group as used herein is a group or molecule composed of at least one silicon atom.
  • the silicon group can be substituted with one or more alkyl groups, where the alkyl groups can be the same or different.
  • a “hydrogel” refers to a polymeric material that can absorb at least 10 percent by weight of water when it is fully hydrated.
  • a hydrogel material can be obtained by polymerization or copolymerization of at least one hydrophilic monomer in the presence of or in the absence of additional monomers and/or macromers or by crosslinking of a prepolymer.
  • a "silicone hydrogel” refers to a hydrogel obtained by copolymerization of a polymerizable composition comprising at least one silicone-containing vinylic monomer or at least one silicone-containing macromer or a silicone-containing prepolymer.
  • "Hydrophilic,” as used herein, describes a material or portion thereof that will more readily associate with water than with lipids.
  • fluid indicates that a material is capable of flowing like a liquid.
  • actinically in reference to curing or polymerizing of a polymerizable composition or material means that the curing (e.g., crosslinked and/or polymerized) is performed by actinic irradiation, such as, for example, UV irradiation, ionized radiation (e.g., gamma ray or X-ray irradiation), microwave irradiation, and the like.
  • actinic irradiation such as, for example, UV irradiation, ionized radiation (e.g., gamma ray or X-ray irradiation), microwave irradiation, and the like.
  • thermal curing or actinic curing methods are well-known to a person skilled in the art.
  • a "monomer” means a low molecular weight compound that can be polymerized actinically, thermally, or chemically. Low molecular weight typically means average molecular weights less than 700 Daltons.
  • a "vinylic monomer,” as used herein, refers to a low molecular weight compound that has an ethylenically unsaturated group and can be polymerized actinically, chemically or thermally. Low molecular weight typically means average molecular weights less than 700 Daltons.
  • a "hydrophilic vinylic monomer,” as used herein, refers to a vinylic monomer that is capable of forming a homopolymer that is water soluble or can absorb at least 10 percent by weight water when fully hydrated.
  • a "macromer” refers to a medium to high molecular weight compound or polymer that contains functional groups capable of undergoing further polymerizing/crosslinking reactions.
  • Medium and high molecular weight typically means average molecular weights greater than 700 Daltons.
  • the macromer contains ethylenically unsaturated groups and can be polymerized actinically or thermally.
  • a "prepolymer” refers to a starting polymer that can be cured (e.g., crosslinked and/or polymerized) actinically or thermally or chemically to obtain a crosslinked and/or polymerized polymer having a molecular weight much higher than the starting polymer.
  • An "actinically-crosslinkable prepolymer” refers to a starting polymer which can be crosslinked upon actinic radiation or heating to obtain a crosslinked polymer having a molecular weight much higher than the starting polymer.
  • Molecular weight of a polymeric material refers to the number-average molecular weight unless otherwise specifically noted or unless testing conditions indicate otherwise.
  • a "photoinitiator” refers to a chemical that initiates radical crosslinking and/or polymerizing reaction by the use of light.
  • Suitable photoinitiators include, without limitation, benzoin methyl ether, diethoxyacetophenone, a benzoyl phosphine oxide, 1- hydroxycyclohexyl phenyl ketone, Darocure® types, and Irgacure® types such as Darocure® 1173, and Irgacure® 2959.
  • Thermal initiator refers to a chemical that initiates radical crosslinking and/or polymerizing reaction by the use of heat energy.
  • suitable thermal initiators include, but are not limited to, 2,2'-azobis (2,4-dimethylpentanenitrile), 2,2'-azobis (2- methylpropanenitrile), 2,2'-azobis (2-mehylbutanenitrile), peroxides such as benzoyl peroxide, and the like.
  • the thermal initiator is azobisisobutyronitrile (AIBN).
  • Treating agent includes, but is not limited to, a dye or a pigment that can be incorporated into the lens or lens forming material.
  • an "antimicrobial agent” refers to a chemical that is capable of decreasing or eliminating or inhibiting the growth of microorganisms such as that term is known in the art.
  • “Surface modification” or “surface treatment”, as used herein, means that an article has been treated in a surface treatment process (or a surface modification process) prior to or posterior to the formation of the article, in which (1) a coating is applied to the surface of the article, (2) chemical species are adsorbed onto the surface of the article, (3) the chemical nature (e.g., electrostatic charge) of chemical groups on the surface of the article are altered, or (4) the surface properties of the article are otherwise modified.
  • Exemplary surface treatment processes include, but are not limited to, a surface treatment by energy (e.g., a plasma, a static electrical charge, irradiation, or other energy source), chemical treatments, the grafting of hydrophilic monomers or macromers onto the surface of an article, mold-transfer coating process disclosed in U.S. Patent No. 6,719,929 (herein incorporated by reference in its entirety), the incorporation of wetting agents into a lens formulation for making contact lenses proposed in U.S. Patent Nos. 6,367,929 and 6,822,016 (herein incorporated by references in their entireties), reinforced mold-transfer coating disclosed in U.S. Patent Application No. 60/811,949 (herein incorporated by reference in its entirety), and LbL coating.
  • energy e.g., a plasma, a static electrical charge, irradiation, or other energy source
  • chemical treatments e.g., the grafting of hydrophilic monomers or macromers onto the surface of an article
  • a preferred class of surface treatment processes is plasma processes, in which an ionized gas is applied to the surface of an article.
  • Plasma gases and processing conditions are described more fully in U.S. Pat. Nos. 4,312,575 and 4,632,844, which are incorporated herein by reference.
  • the plasma gas is preferably a mixture of lower alkanes and nitrogen, oxygen or an inert gas.
  • Opt lens refers to a lens used on or about the eye or the ocular vicinity.
  • ophthalmic lenses include, but are not limited to, contact lens (hard or soft), an intraocular lens, a corneal onlay, or other lenses that are used on or about the eye or the ocular vicinity.
  • Contact lens refers to a structure that can be placed on or within a wearer's eye.
  • a contact lens can correct, improve, or alter a user's eyesight, but that need not be the case.
  • a contact lens can be of any appropriate material known in the art or later developed, and can be a soft lens, a hard lens, or a hybrid lens.
  • a contact lens has an anterior surface and an opposite posterior surface and a circumferential edge where the anterior and posterior surfaces are tapered off.
  • Water content is the percentage by weight of water in a contact lens when it is fully hydrated.
  • the water content (%) of contact lenses is measured using an ATAGO CL-1 Refractometer or an ATAGO N2-E Refractometer.
  • the intrinsic "oxygen permeability" (Dk) of a material is the rate at which oxygen will pass through a material.
  • oxygen permeability (Dk) in reference to a material or a contact lens means an apparent oxygen permeability which is measured with a sample (film or lens) of 90 or 100 microns in average thickness over the area being measured according to a coulometric method described in Examples.
  • Oxygen permeability is conventionally expressed in units of barrers, where "barrer” is defined as [(cm 3 oxygen)(mm) / (cm 2 )(sec)(mm Hg)] x 10 "10 .
  • the "oxygen transmissibility", Dk/t, of a lens or material is the rate at which oxygen will pass through a specific lens or material with an average thickness of t [in units of mm] over the area being measured.
  • Oxygen transmissibility is conventionally expressed in units of barrers/mm, where "barrers/mm” is defined as [(cm 3 oxygen) / (cm 2 )(sec)(mm Hg)] x 10 "9 .
  • the "ion permeability" through a lens correlates with the Ionoflux Diffusion Coefficient, D (in units of [mm 2 /min]), which is determined by applying Fick's law as follows:
  • n' rate of ion transport [mol/min]
  • A area of lens exposed [mm 2 ]
  • dc concentration difference [mol/L]
  • dx thickness of lens [mm].
  • the invention is partly based on unexpected discovery that by adding a small percentage of an IP-enhancing vinylic monomer or macromer into silicone hydrogel lens formulations, the ion permeability of resultant silicone hydrogel contact lenses can be increased significantly while the water content and the oxygen permeability of the lenses are not significantly changed, i.e., the changes in water content or oxygen permeability (Dk) is less than about 8% relative to control (change in water content over the water content of the control lens or change in Dk over the Dk value of the control lens).
  • Dk oxygen permeability
  • the method for increasing the ion permeability of a silicone hydrogel contact lens comprises:
  • a lens-forming material comprising (i) at least one silicone-containing vinylic monomer or macromer, (ii) at least one hydrophilic vinylic monomer; and (iii) at least one IP-enhancing vinylic monomer or macromer represented by formula I;
  • X 1 is a direct bond, an oxygen atom (-0-) or— N — , wherein R' is H or C C 4 alkyl;
  • L is a direct bond, a linear or branched Q-Cio alkylene divalent radical (or so-called divalent aliphatic hydrocarbon radical), or a divalent radical of -X 3 -E-X 4 -, wherein X 3 and R'
  • X 4 are, independently, a linkage selected from the group consisting of -0-, — N— ,
  • E is an alkylene divalent radical, a cycloalkyl diradical, an alkylcycloalkyl diradical, an alkylaryl diradical, or an aryl diradical with up to 40 carbon atoms, wherein E optionally can have ether, thio, or amine linkages in the main chain;
  • Y is -(R i -0) n -(R 2 _0) m _(R 3 _0)p-R
  • R 1 , R 2 , and R 3 are, independently, a linear or branched C 2 -C 4 -alkylene
  • n, m and p are, independently, a number from 0 to 100, wherein the sum of (n+m+p) is 2 to 100
  • R is hydrogen, a C r C alkyl or alkoxy radical
  • Z is hydrogen or methyl
  • silicone hydrogel contact lens obtained by cast-molding of the lens-forming material with the IP-enhancing vinylic monomer or macromer of the formula I has an increased ion permeability compared to a control lens produced from a control lens-forming material without the IP-enhancing vinylic monomer or macromer of the formula I, b. curing the lens-forming material to produce the lens;
  • One or more compounds of the formula I can be added in the lens forming material to produce a silicone hydrogel contact lens with increased ion permeability.
  • the contact lens has an increased ion permeability compared to the control lens produced from a control formulation without a compound of the formula I (having identical concentrations of all polymerizable components except the compound of formula I).
  • a lens produced from a lens forming material including a compound having the formula I has an ion permeability that is 20%, 30%, 40%, 50%, or 60% greater than the control lens.
  • the ophthalmic lenses produced herein have an lonoflux Diffusion Coefficient (D) of at least about 1.5 x 10 "5 mm 2 /min, preferably at least about 2.5 x 10 "5 mm 2 /min, and even more preferably at least about 6.0 x 10 "5 mm 2 /min.
  • D lonoflux Diffusion Coefficient
  • the IP-enhancing vinylic monomer or macromer of the formula I has a hydrophilic group Y.
  • the hydrophilic group includes a polyethylene glycol chain or a copolymer chain composed of ethylene oxide and propylene oxide units, or other hydrophilic polymers known in the art such as polyvinylpyrrolidone, polydimethaylacrylamide (PDMA), etc.
  • the molecular weight of the hydrophilic group can vary as well.
  • the polyalkylene oxide can have a molecular weight of 100 to 10,000, more preferably 200 to 5,000, and even more preferably 500 to 2,500.
  • Y in formula I is a residue of polyethylene glycol having a molecular weight of 500 to 2,500, and Z is methyl.
  • two or more compounds having the formula I can be used to produce the lens.
  • two different compounds having the formula I can be used, where the hydrophilic group Y are the same group but each having a different molecular weight.
  • two compounds having the formula I are used, where for each compound, Z is methyl, and Y comprises a residue of polyethylene glycol having a molecular weight of 500 to 2,500, wherein the molecular weight of the polyethylene glycol residue for each compound is different.
  • Z is methyl
  • Y comprises a residue of polyethylene glycol having a molecular weight of 500 to 2,500, wherein the molecular weight of the polyethylene glycol residue for each compound is different.
  • Y is polyethylene glycol
  • the molecular weight of polyethylene glycol in the first compound is 1,100 and the molecular weight of polyethylene glycol in the second compound is 2,080.
  • Compounds of formula I can be obtained from commercial sources or can be prepared according to any procedures known to a person skilled in the art.
  • a compound of formula I can be obtained by reacting a monofunctional terminated polyethylene glycol having one first functional group selected from the group consisting of isocyanate, amino, epoxy, hydroxyl, acid chloride, azlactone, and thiol with a vinylic monomer having a second functional group coreactive with the first functional group and selected from the group consisting of isocyanate, amino, epoxy, hydroxyl, acid chloride, azlactone, and thiol group.
  • PEGs can be obtained from commercial vendors.
  • Preferred monofunctional-terminated PEGs are those PEGs with one amino, hydroxyl, acid chloride, or epoxy group at one terminus and a methoxy or ethoxy group at the other terminus.
  • the amount of the compound having the formula I used in the methods described herein can vary depending upon the identity and molecular weight of the hydrophilic group, the lens-forming materials selected, and the desired ion permeability. In one aspect, the amount of the compound having the formula I is up to about 3% by weight, preferably from about 0.5% to about 2.5% by weight in the lens formulation.
  • the compound having the formula I is polymerized with other lens-forming materials to produce an ophthalmic lens.
  • the lens-forming material can be a polymerizable fluid that includes, for example, a solution, a dispersion, a solvent-free liquid, or a melt at a temperature below 60 °C.
  • the lens-forming material includes, but is not limited to, an actinically crosslinkable prepolymer.
  • hydrophilic vinylic monomers can be used herein to make the lenses.
  • hydrophilic vinylic monomers include, but are not limited to, hydroxyl- substituted lower alkyl (Cj to C 3 ) (meth)acrylates, hydroxyl-substituted lower alkyl vinyl ethers, C ⁇ to C 3 alkyl(meth)acrylamide, di-(Ci-C 3 alkyl)(meth)acrylamide, N-vinylpyrrole, N- vinyl-2-pyrrolidone, 2-vinyloxazoline, 2-vinyl-4,4'-dialkyloxazolin-5-one, 2- and 4- vinylpyridine, amino(lower alkyl)- (where the term "amino" also includes quaternary ammonium), mono(lower alkylamino)(lower alkyl) and di(lower alkylamino)(lower alkyl)(meth)acrylates, allyl alcohol, N-vinyl to C 3 al
  • Examples of preferred hydrophilic vinylic monomers are N,N-dimethylacrylamide (DMA), ⁇ , ⁇ -dimethylmethacrylamide (DMMA), 2-acrylamidoglycolic acid, 3- acryloylamino-l-propanol, N-hydroxyethyl acrylamide, N-[tris(hydroxymethyl)methyl]- acrylamide, N-methyl-3-methylene-2-pyrrolidone, l-ethyl-3-methylene-2-pyrrolidone, 1- methyl-5-methylene-2-pyrrolidone, 1 -ethyl-5-methylene-2-pyrrolidone, 5-methyl-3- methylene-2-pyrrolidone, 5-ethyl-3-methylene-2-pyrrolidone, 1 -n-propyl-3-methylene-2- pyrrolidone, l-n-propyl-5-methylene-2-pyrrolidone, l-isopropyl-3-methylene-2-pyrrolidon
  • HEMA 2-hydroxyethylmethacrylate
  • HAA 2-hydroxyethyl acrylate
  • HPMA hydroxypropyl methacrylate
  • 2- hydroxy propylmethacrylate hydrochloride aminopropyl methacrylate hydrochloride, dimethylaminoethyl methacrylate (DMAEMA), glycerol methacrylate (GMA), N-vinyl-2- pyrrolidone (NVP), allyl alcohol, vinylpyridine, N-vinyl formamide, N-vinyl acetamide, N- vinyl isopropylamide, N-vinyl-N-methyl acetamide, allyl alcohol, N-vinyl caprolactam, and mixtures thereof.
  • Any suitable silicone-containing vinylic monomers or macromers can be used in the invention.
  • silicone-containing vinylic monomers include without limitation N-[tris(trimethylsiloxy)silylpropyl]-(meth)acrylamide, N- [tris(dimethylpropylsiloxy)-silylpropyl]-(meth)acrylamide, N- [tris(dimethylphenylsiloxy)silylpropyl] (meth)acrylamide, N- [tris(dimethylethylsiloxy)silylpropyl] (meth)acrylamide, N-(2-hydroxy-3 -(3 - (bis(trimethylsilyloxy)methylsilyl)propyloxy)propyl)-2- methyl acrylamide; N-(2-hydroxy-3- (3-(bis(trimethylsilyloxy)methylsilyl)propyloxy)propyl) acrylamide; N,N-bis[2-hydroxy-3-(3- (bis(trimethylsilyloxy)methylsilyl)propyloxy)propyl]-2-methyl acrylamide
  • siloxane-containing (meth)acrylamide monomers of formula (1) are N-[tris(trimethylsiloxy)silylpropyl]acrylamide, and TRIS, N-[2-hydroxy-3-(3-(t- butyldimethylsilyl)propyloxy)propyl]acrylamide.
  • a class of preferred silicone-containing vinylic monomers or macromers is polysiloxane-containing vinylic monomers or macromers.
  • a "polys iloxane-containing vinylic monomer or macromer” refers to a vinylic monomer or macromer containing at least one
  • R 1 and R 2 are, independently, a monovalent Ci-Cio alkyl, a monovalent Ci-Ci 0 aminoalkyl, a monovalent of Ci-do hydroxyalkyl, Ci-Cio ether, Cj-do fluoroalkyl, C Ci 0 fluoroether or C 6 -Ci 8 aryl radical, -alk-(OCH2CH2) m -OR 3 , in which alk is d-C 6 alkylene divalent radical, R 3 is hydrogen or Ci-C 6 alkyl, and m is an integer of from 1 to 10; n is an integer of 3 or higher.
  • vinylic monomers or macromers include monomethacrylated or monoacrylated polydimethylsiloxanes of various molecular weight (e.g., mono-3- methacryloxypropyl terminated, mono-butyl terminated polydimethylsiloxane or mono-(3- methacryloxy-2-hydroxypropyloxy)propyl terminated, mono-butyl terminated polydimethylsiloxane); dimethacrylated or diacrylated polydimethylsiloxanes of various molecular weight; vinyl carbonate-terminated polydimethylsiloxanes; vinyl carbamate- terminated polydimethylsiloxane; vinyl terminated polydimethylsiloxanes of various molecular weight; methacrylamide-terminated polydimethylsiloxanes; acrylamide-terminated polydimethylsiloxanes; acrylate-terminated polydimethylsiloxanes; methacrylate-terminated polydimethylsiloxanes; bis
  • Patent Nos. 4,259,467, 4,260,725, and 4,261,875 (herein incorporated by reference in their entireties).
  • Di and triblock macromers consisting of polydimethylsiloxane and polyalkyleneoxides could also be of utility.
  • methacrylate end capped polyethyleneoxide-block-polydimethylsiloxane-block-polyethyleneoxide can be used herein to enhance oxygen permeability.
  • Suitable monofunctional hydroxyl-functionalized siloxane- containing vinylic monomers/macromers and suitable multifunctional hydroxyl- functionalized siloxane-containing vinylic monomers/macromers are commercially available from Gelest, Inc, Morrisville, PA.
  • silicone-containing macromers comprising hydrophilic segments and hydrohphobic segments. Any suitable silicone-containing prepolymers with hydrophilic segments and hydrohphobic segments can be used herein. Examples of such silicone-containing prepolymers include those described in commonly-owned US Patent Nos. 6,039,913, 7,091,283, 7,268, 189 and 7,238,750, 7,521,519; commonly-owned US patent application publication Nos. US 2008-0015315 Al, US 2008- 0143958 Al, US 2008-0143003 Al, US 2008-0234457 Al, US 2008-0231798 Al, and commonly-owned US patent application Nos. 61/180,449 and 61/180,453; all of which are incorporated herein by references in their entireties.
  • a lens forming materiarfor making silicone hydrogel lenses can also comprise a hydrophobic monomer.
  • a hydrophobic vinylic monomer By incorporating a certain amount of hydrophobic vinylic monomer in a lens forming material, the mechanical properties (e.g., modulus of elasticity) of the resultant polymer may be improved. Nearly any hydrophobic vinylic monomer can be used.
  • hydrophobic vinylic monomers include, but are not limited to, methylacrylate, ethyl-acrylate, propylacrylate, isopropylacrylate, cyclohexylacrylate, 2- ethylhexylacrylate, methylmethacrylate, ethylmethacrylate, propylmethacrylate, vinyl acetate, vinyl propionate, vinyl butyrate, vinyl valerate, styrene, chloroprene, vinyl chloride, vinylidene chloride, acrylonitrile, 1-butene, butadiene, methacrylonitrile, vinyl toluene, vinyl ethyl ether, perfluorohexylethyl-thio-carbonyl-aminoethyl-methacrylate, isobornyl methacrylate, trifluoroethyl methacrylate, hexafluoro-isopropyl methacrylate, hexafluor
  • a polymerizable composition for making silicone hydrogel lenses can also comprise one or more crosslinking agents (i.e., compounds with two or more acryl groups or three or more thiol or ene-containing groups and with molecular weight less than 700 Daltons).
  • crosslinking agents i.e., compounds with two or more acryl groups or three or more thiol or ene-containing groups and with molecular weight less than 700 Daltons.
  • cross-linking agents include without limitation tetraethyleneglycol diacrylate, triethyleneglycol diacrylate, ethyleneglycol diacylate, diethyleneglycol diacrylate, tetraethyleneglycol dimethacrylate, triethyleneglycol dimethacrylate, ethyleneglycol dimethacylate, diethyleneglycol dimethacrylate, trimethylopropane trimethacrylate, pentaerythritol tetramethacrylate, bisphenol A dimethacrylate, vinyl methacrylate, ethylenediamine dimethyacrylamide, ethylenediamine diacrylamide, glycerol dimethacrylate, triallyl isocyanurate, triallyl cyanurate, allylmethacrylate, allylmethacrylate, 1,3- bis(methacrylamidopropyl)-l , 1 ,3,3-tetrakis(trimethylsiloxy)disiloxane, ⁇ , ⁇ , ⁇
  • a preferred cross-linking agent is tetra(ethyleneglycol) diacrylate, tri(ethyleneglycol) diacrylate, ethyleneglycol diacrylate, di(ethyleneglycol) diacrylate, methylenebisacrylamide, triallyl isocyanurate, or triallyl cyanurate.
  • the amount of a cross- linking agent used is expressed in the weight content with respect to the total polymer and is preferably in the range from about 0.05% to about 4%, and more preferably in the range from about 0.1% to about 2%.
  • a polymerizable composition for making silicone hydrogel lenses can also comprise various components, such as, for example, polymerization initiators (e.g., photoinitiator or thermal initiator), a visibility tinting agent (e.g., dyes, pigments, or mixtures thereof), a polymerizable UV-absorbing agent, a polymerizable latent UV-absorbing agent, antimicrobial agents (e.g., preferably silver nanoparticles), bioactive agent, leachable lubricants, and the like, as known to a person skilled in the art.
  • polymerization initiators e.g., photoinitiator or thermal initiator
  • a visibility tinting agent e.g., dyes, pigments, or mixtures thereof
  • a polymerizable UV-absorbing agent e.g., a polymerizable latent UV-absorbing agent
  • antimicrobial agents e.g., preferably silver nanoparticles
  • bioactive agent e.g., preferably silver nanoparticles
  • photoinitiators include, but are not limited to, benzoin methyl ether, diethoxyacetophenone, a benzoylphosphine oxide, 1-hydroxycyclohexylphenyl ketone, or Darocure® or Irgacure® types, for example Darocure® 1173 or Irgacure® 2959.
  • benzoylphosphine initiators include 2,4,6-tri-methylbenzoyldiphenylophosphine oxide, bis-(2,6 dichlorobenzoyl)-4-N-propylphenylphosphine oxide; and bis-(2,6- dichlorobenzoyl)-4-N-butylphenylphosphine oxide.
  • the amount of photoinitiator can be selected within wide limits, an amount of up to 0.05 g/g of prepolymer and preferably up to 0.003 g/ g of prepolymer can be used.
  • thermal initiators include, but are not limited to, 2,2'-azobis (2,4-dimethylpentanenitrile), 2,2'-azobis (2-methylpropanenitrile), 2,2'-azobis (2-methylbutanenitrile), azobisisobutyronitrile (AIBN), peroxides such as benzoyl peroxide, and the like.
  • the lens-forming material can further include a UV-absorber, a tinting agent, an antimicrobial agent, an inhibitor, a filler or any combination thereof.
  • the ultraviolet absorber can include, for example, a benzotriazole or a benzophenone. Many benzotriazole and benzophenone UV absorbers are known and many are commercially available. The identity of the benzotriazole or benzophenone UV absorber is not critical, but should be selected based on its characteristic U V cut-off to give the desired UV absorbing property.
  • the lens-forming materials and other components are mixed together in a solvent prior to introduction into the mold.
  • suitable solvents are water, alcohols (e.g., lower alkanols having up to 6 carbon atoms, such as ethanol, methanol, propanol, isopropanol), carboxylic acid amides (e.g., dimethylformamide), dipolar aprotic solvents (e.g., dimethyl sulfoxide or methyl ethyl ketone), ketones (acetone or cyclohexanone), hydrocarbons (e.g., toluene), ethers (e.g., THF, dimethoxyethane or dioxane), and halogenated hydrocarbons (e.g., trichloroethane), and any combination thereof.
  • alcohols e.g., lower alkanols having up to 6 carbon atoms, such as ethanol, methanol, propanol, isopropanol
  • the aqueous solution of the lens-forming materials can also include, for example an alcohol, such as methanol, ethanol or n- or iso-propanol, or a carboxylic acid amide, such as N,N- dimethylformamide, or dimethyl sulfoxide.
  • the aqueous solution of the lens- forming materials contains no further solvent.
  • the lens-forming material as described above is poured into a mold with a specific shape and size.
  • the lens can be produced using techniques known in the art.
  • the contact lens can be produced in a conventional "spin-casting mold," as described for example in U.S. Patent No. 3,408,429, or by the full cast-molding process in a static form, as described in U.S. Patent Nos. 4,347,198; 5,508,317; 5,583,463; 5,789,464; and 5,849,810.
  • a mold for full cast molding
  • a mold generally comprises at least two mold sections (or portions) or mold halves, i.e. first and second mold halves.
  • the first mold half defines a first molding (or optical) surface and the second mold half defines a second molding (or optical) surface.
  • the first and second mold halves are configured to receive each other such that a lens forming cavity is formed between the first molding surface and the second molding surface.
  • the molding surface of a mold half is the cavity-forming surface of the mold and in direct contact with the lens-forming material.
  • first and second mold halves can be formed through various techniques, such as injection molding or lathing. Examples of suitable processes for forming the mold halves are disclosed in U.S. Patent Nos. 4,444,711; 4,460,534; 5,843,346; and 5,894,002, which are also incorporated herein by reference.
  • Virtually all materials known in the art for making molds can be used to make molds for preparing ocular lenses.
  • polymeric materials such as polyethylene, polypropylene, polystyrene, PMMA, cyclic olefin copolymers (e.g., Topas ® COC from Ticona GmbH of Frankfurt, Germany and Summit, New Jersey; Zeonex® and Zeonor® from Zeon Chemicals LP, Louisville, KY), or the like can be used.
  • Other materials that allow UV light transmission could be used, such as quartz glass and sapphire.
  • the lens-forming material is poured into the mold, the lens-forming material is cured (i.e., polymerized) to produce a polymeric matrix and ultimately the lens.
  • the techniques for conducting the polymerization step will vary depending upon the selection of the lens-forming material.
  • the mold containing the admixture can be exposed to a spatial limitation of actinic radiation to polymerize the prepolymer.
  • the mold containing the lens forming material can be subjected to heat in order to cure the lens-forming material.
  • the energy used to cure the lens-forming material is in the form of rays directed by, for example, a mask or screen or combinations thereof, to impinge, in a spatially restricted manner, onto an area having a well defined peripheral boundary.
  • a spatial limitation of UV radiation can be achieved by using a mask or screen that has a transparent or open region (unmasked region) surrounded by a UV impermeable region (masked region), as schematically illustrated in Figs 1-9 of U.S. Patent No. 6,627,124 (herein incorporated by reference in its entirety).
  • the unmasked region has a well defined peripheral boundary with the unmasked region.
  • the energy used for the crosslinking is radiation energy, UV radiation, visible light, gamma radiation, electron radiation or thermal radiation, the radiation energy preferably being in the form of a substantially parallel beam in order on the one hand to achieve good restriction and on the other hand efficient use of the energy.
  • the mold containing the lens-forming material is exposed to light having a wavelength greater than 300 nm, greater than 310 nm, greater than 320 nm, greater than 330 nm, greater than 340 nm, greater than 350 nm, greater than 360 nm, greater than 370 nm, or greater than 380 nm.
  • Cut-off filters known in the art can be used to filter and prevent specific wavelengths of energy from contacting the mold and lens-forming material.
  • the time the lens-forming mixture is exposed to the energy is relatively short, e.g. in less than or equal to 150 minutes, in less than or equal to 90 minutes, in less than or equal 60 minutes, less than or equal to 20 minutes, less than or equal to 10 minutes, less than or equal to 5 minutes, from 1 to 60 seconds, or from 1 to 30 seconds.
  • the methods described herein increase the ion permeability of an ophthalmic lens without adversely affecting other properties of the lens.
  • the lens' water content and oxygen permeability remain essentially the same when one or more compounds having the formula I are used to produce the lens vs. the control lens without a compound having the formula I.
  • the lens has a water content from 30% to 37%.
  • the lens has an oxygen permeability greater than 70.
  • the use of compounds having the formula I result in the formation of clear lenses, which is another important feature.
  • the preferred water content of the lens is from 20% to 50%, with an oxygen permeability greater than 70.
  • reaction conditions e.g., component concentrations, desired solvents, solvent mixtures, temperatures, pressures and other reaction ranges and conditions that can be used to optimize the product purity and yield obtained from the described process. Only reasonable and routine experimentation will be required to optimize such process conditions.
  • Oxygen permeability measurements The oxygen permeability of a lens and oxygen transmissibility of a lens material is determined according to a technique similar to the one described in U.S. Patent No. 5,760,100 and in an article by Winterton et al., (The Cornea: Transactions of the World Congress on the Cornea 1 11, H.D. Cavanagh Ed., Raven Press: New York 1988, pp273-280), both of which are herein incorporated by reference in their entireties.
  • Oxygen fluxes (J) are measured at 34°C in a wet cell (i.e., gas streams are maintained at about 100% relative humidity) using a DklOOO instrument (available from Applied Design and Development Co., Norcross, GA), or similar analytical instrument.
  • An air stream having a known percentage of oxygen (e.g., 21%), is passed across one side of the lens at a rate of about 10 to 20 cm 3 /min., while a nitrogen stream is passed on the opposite side of the lens at a rate of about 10 to 20 cm 3 /min.
  • a sample is equilibrated in a test media (i.e., saline or distilled water) at the prescribed test temperature for at least 30 minutes prior to measurement but not more than 45 minutes.
  • any test media used as the overlayer is equilibrated at the prescribed test temperature for at least 30 minutes prior to measurement but not more than 45 minutes.
  • the stir motor's speed is set to 1200 ⁇ 50 rpm, corresponding to an indicated setting of 400 ⁇ 15 on the stepper motor controller.
  • the barometric pressure surrounding the system, Pmeasured is measured.
  • the thickness (t) of the lens in the area being exposed for testing is determined by measuring about 10 locations with a Mitotoya micrometer VL-50, or similar instrument, and averaging the measurements.
  • the oxygen concentration in the nitrogen stream i.e., oxygen which diffuses through the lens
  • the apparent oxygen permeability of the lens material, Dk app is determined from the following formula:
  • Dk ap p is expressed in units of barrers.
  • the oxygen transmissibility (Dk /t) of the material may be calculated by dividing the oxygen permeability (Dk app ) by the average thickness (t) of the lens.
  • Ion Permeability Measurements The ion permeability of a lens is measured according to procedures described in U.S. Patent No. 5,760,100 (herein incorporated by reference in its entirety. The values of ion permeability reported in the following examples are relative ionoflux diffusion coefficients (D/D ref ) in reference to a lens material, Alsacon, as reference material. Alsacon has an ionoflux diffusion coefficient of 0.314X10 "3 mm 2 /minute.
  • a silicone hydrogel lens formulation, formulation A is composed of about 33% of chain-extended polydimethylsiloxane (CE-PDMS), 19% TRIS-methacrylamide (TRIS-MA), 23% dimethylacrylamide (DMA), 0.5% 2-hydroxy-2-methyl-l -phenyl- 1 -one (Darocur 1173) and 24.5% 1-propanol (1-PrOH).
  • a small amount of N-(carbonyl-methyoxypolyethylene glycol-2000)-l,2-disteearoyl-sn-glycero-3-phosphoethanolamine, sodium salt (L-PEG-2000) may also be added.
  • Formulation A is made by the following procedure.
  • L-PEG-2000 and 1-propanol are mixed first.
  • CE-PDMS, TRIS-MA, DMA and Darocur 1173 are added.
  • DSM lens casting no L-PEG-2000 is used in the formulation.
  • the bottle is placed on a roller (model No LJRM, PAULO ABBE) and rolled slowly for about 2 hours before the formulation is used for making lenses.
  • Formulation A modified with PEG additives is studied. Experiments are carried out to study the maximum percentage of polyethylene glycol methacrylate (PEG-MA) or PEG- MA mixture having different molecular weights that can be incorporated into formulation A while still achieving clear lenses.
  • PEG-MA 2080 Mw 2080, 50% in water
  • PEG-MA 1100 are purchased from Aldrich-Sigma and used as received.
  • the composition of the lens formulations are shown in Table 1. Lenses are prepared by using the full-cast molding of a lens formulation in polypropylene molds under UV irradiation (Philips F20T12 bulb, an intensity of 5.4 mW/cm 2 (measured by IL1700 radiometer), curing time is lOmin).
  • IP ion permeability
  • Contact lenses with high IP can be obtained from a lens formulation including a PEG additive using double sided molding (DSM) process .
  • DSM double sided molding
  • unexpected high IP values are also observed for the lenses cured by the DSM curing process using poly(cycloalkylenedialkylene terephthalate) (PCTA) molds at a light intensity of 5.4 mW/cm 2 (measured by IL1700 radiometer) with Philips F20T12 bulb for about lOminutes.
  • Formulation B is prepared by using the same procedure as formulation A, except that the TRIS-methacrylamide used in formulation A is replaced with TRIS-acrylamide in formulation B.
  • Lenses with PEG additives are made from formulation B with one or two additives: 0.75% PEG-MA2080 and 0.75% PEG-MA2080 plus l%EO-PO-MA.
  • EO-PO is a copolymer of ethylene oxide and propylene oxide. The IP value increased from about 8.7 (control-no PEG) to 13.1 or 15.1 (with PEG), while the Dk remained unchanged.
  • Formulation C is prepared from 25.92% Betacon, 19.25% TRIS-methacrylate, 28.88% dimethylacrylamide (DMA), 1% 2-hydroxy-2-methyl-l -phenyl- 1 -one (Darocur 1173) and 24.95% ethanol.
  • Formulation D is prepared from 18.44% Betacon, 27.05% TRIS- methacrylate, 29.51% dimethylacrylamide (DMA), 0.8% 2-hydroxy-2-methyl-l -phenyl- 1 -one (Darocur 1173) and 24.2% ethanol.
  • IP values are studied using lenses coated with methane-air rotary plasma coating. As shown in Table 6, except for one condition, IP values increased for lenses with the PEG additive. The IP value increase is statistically significant at 95% confidence level (based on one-way ANOVA analysis).
  • IP value the impact of PEG additive on IP value is studied using lenses coated with methane-air linear plasma coating or methane-nitrogen linear plasma coating. As listed in Table 7 and Table 8, IP values increased for lenses having PEG additive. For most of the conditions, the IP value increase is statistically significant at 95% confidence level.

Abstract

La présente invention concerne des procédés pour augmenter la perméabilité ionique d'une lentille de contact en hydrogel de silicone en ajoutant une faible quantité d'un monomère ou macromère vinylique hydrophile améliorant la perméabilité ionique (« IP-enhancing ») dans un matériau de formation de lentille pour moulage par coulée de lentilles de contact en hydrogel de silicone, tout en ne modifiant pas significativement la teneur en eau et/ou la perméabilité à l'oxygène des lentilles obtenues à partir du matériau de formation de lentille.
PCT/US2010/059021 2009-12-07 2010-12-06 Procédés pour augmenter la perméabilité ionique de lentilles de contact WO2011071790A1 (fr)

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US20110133350A1 (en) 2011-06-09
CN102639636A (zh) 2012-08-15
US8883051B2 (en) 2014-11-11
EP2510051A1 (fr) 2012-10-17

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