WO2013188274A2 - Azetidinium-containing copolymers and uses thereof - Google Patents

Azetidinium-containing copolymers and uses thereof Download PDF

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Publication number
WO2013188274A2
WO2013188274A2 PCT/US2013/044938 US2013044938W WO2013188274A2 WO 2013188274 A2 WO2013188274 A2 WO 2013188274A2 US 2013044938 W US2013044938 W US 2013044938W WO 2013188274 A2 WO2013188274 A2 WO 2013188274A2
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Prior art keywords
meth
acrylate
acid
group
azetidinium
Prior art date
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PCT/US2013/044938
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English (en)
French (fr)
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WO2013188274A3 (en
Inventor
Troy Vernon Holland
Frank Chang
Yongxing Qiu
John Dallas Pruitt
Chung-Yuan Chiang
Manivakkam J. Shankernarayanan
Robert Scott
Yash Kapoor
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Novartis AG
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Novartis AG
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Priority to KR1020157000331A priority Critical patent/KR102051174B1/ko
Priority to NZ700848A priority patent/NZ700848A/en
Priority to CN201380031139.6A priority patent/CN104364070B/zh
Priority to CA2870333A priority patent/CA2870333C/en
Priority to SG11201407327VA priority patent/SG11201407327VA/en
Priority to RU2014151562A priority patent/RU2647728C2/ru
Priority to EP13731005.8A priority patent/EP2861413B1/en
Priority to JP2015517331A priority patent/JP6306576B2/ja
Priority to MX2014015424A priority patent/MX366036B/es
Application filed by Novartis AG filed Critical Novartis AG
Priority to BR112014028700-7A priority patent/BR112014028700B1/pt
Priority to HK15104236.9A priority patent/HK1203449B/en
Priority to AU2013274549A priority patent/AU2013274549B2/en
Publication of WO2013188274A2 publication Critical patent/WO2013188274A2/en
Publication of WO2013188274A3 publication Critical patent/WO2013188274A3/en
Priority to IN9755DEN2014 priority patent/IN2014DN09755A/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/24—Homopolymers or copolymers of amides or imides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F26/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen
    • C08F26/06—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen by a heterocyclic ring containing nitrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00038—Production of contact lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00865—Applying coatings; tinting; colouring
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D205/00—Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom
    • C07D205/02—Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom not condensed with other rings
    • C07D205/04—Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom not condensed with other rings having no double bonds between ring members or between ring members and non-ring members
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/52—Amides or imides
    • C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/52—Amides or imides
    • C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
    • C08F220/56—Acrylamide; Methacrylamide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F224/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a heterocyclic ring containing oxygen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F26/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
    • C08F283/12—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polysiloxanes
    • C08F283/124—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polysiloxanes on to polysiloxanes having carbon-to-carbon double bonds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/24—Homopolymers or copolymers of amides or imides
    • C09D133/26—Homopolymers or copolymers of acrylamide or methacrylamide
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D137/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a heterocyclic ring containing oxygen; Coating compositions based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D139/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Coating compositions based on derivatives of such polymers
    • C09D139/04—Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
    • C09D151/08—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C09D151/085—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds on to polysiloxanes
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/04—Contact lenses for the eyes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
    • C08F2500/26—Use as polymer for film forming

Definitions

  • the present invention generally relates to azetidinium-containing vinylic monomers and copolymers suitable for applying a hydrogel coating onto a silicone hydrogel contact lens in a cost-effective and time-efficient manner.
  • the present invention provides an ophthalmic lens product.
  • a silicone hydrogel material typically has a surface, or at least some areas of its surface, which is hydrophobic (non-wettable) and susceptible to adsorbing lipids or proteins from the ocular environment and may adhere to the eye.
  • a silicone hydrogel contact lens will generally require a surface modification.
  • a known approach for modifying the hydrophilicity of a relatively hydrophobic contact lens material is through the use of a plasma treatment, for example, commercial lenses such as Focus NIGHT & DAYTM and 020PTIXTM (CIBA VISION), and PUREVISIONTM (Bausch & Lomb) utilize this approach in their production processes.
  • Advantages of a plasma coating such as, e.g., those may be found with Focus NIGHT & DAYTM, are its durability, relatively high hydrophilicity/wettability), and low susceptibility to lipid and protein deposition and adsorption.
  • plasma treatment of silicone hydrogel contact lenses may not be cost effective, because the preformed contact lenses must typically be dried before plasma treatment and because of relative high capital investment associated with plasma treatment equipment.
  • Various other approaches are proposed and/or used for modifying the surface hydrophilicity of a silicone hydrogel contact lens.
  • examples of such other approaches include incorporation of wetting agents (hydrophilic polymers) into a lens formulation for making the silicone hydrogel contact lens (see, e.g., U.S. Pat. Nos. 6367929, 6822016, 7052131 , and 7249848); a layer-by-layer (LbL) polyionic material deposition technique (see, e.g., U.S. Pat. Nos. 6451871 ; 6719929; 6793973; 6884457; 6896926; 6926965; 6940580; and 7297725, and U.S. Pat. Appl. Pub. Nos.
  • LbL coatings may not be as durable as plasma coatings and may have relatively high densities of surface charges; which may interfere with contact lens cleaning and disinfecting solutions.
  • Crosslinked LbL coatings may have a hydrophilicity and/or wettability inferior than original LbL coatings (prior to
  • crosslinking and still have relative high densities of surface charges.
  • they may not be cost-effective and/or time-efficient for implementation in a mass production
  • the invention in the first aspect, provides an azetidinium-containing vinylic monomer.
  • the invention in the second aspect, provides an azetidinium-containing copolymer comprising azetidinium-containing monomeric units derived from at least one azetidinium- containing vinylic monomer of the invention and monomeric units derived from at least one vinylic monomer selected from the group consisting of a carboxyl-containing vinylic monomer, an amino-containing vinylic monomer, a hydrophobic vinylic monomer, and combination thereof.
  • the invention in the third aspect, provides a method for producing coated silicone hydrogel contact lenses each having a crosslinked hydrophilic coating thereon, the method of invention comprising the steps of: (a) obtaining a silicone hydrogel contact lens; (b) applying a prime coating of an anchoring polymer onto the silicone hydrogel contact lens, wherein the anchoring polymer is a homopolymer or copolymer of a carboxyl-containing vinylic monomer and/or an azetidinium-containing copolymer of the invention; and (c) heating the silicone hydrogel contact lens in an aqueous solution in the presence of a water- soluble thermally-crosslinkable hydrophilic polymeric material comprising azetidinium, carboxyl, amino, and/or thiol groups, to and at a temperature from about 40°C to about 140°C for a period of time sufficient to induce intermolecular and intramolecular crosslinking reactions between one azetidinium group and one amino or carboxyl group, thereby
  • the invention in the fourth aspect, provides a method for producing silicone hydrogel contact lenses each having a crosslinked hydrophilic coating thereon, the method of invention comprising the steps of: (a) obtaining a silicone hydrogel contact lens from a lens- forming composition comprising an azetidinium-containing copolymer of the invention; (b) heating the silicone hydrogel contact lens in an aqueous solution in the presence of a water- soluble, thermally-crosslinkable hydrophilic polymeric material comprising azetidinium, carboxyl, amino, and/or thiol groups, to and at a temperature from about 40°C to about 140°C for a period of time sufficient to induce intermolecular and intramolecular crosslinking reactions between one azetidinium group and one amino or carboxyl group, thereby forming a durable non-silicone hydrogel coating on the silicone hydrogel contact lens.
  • the invention provides a silicone hydrogel contact lens comprising a non-silicone hydrogel coating thereon, wherein the non-silicone hydrogel coating is obtained by thermally inducing intermolecular and intramolecular crosslinking of a thermally- crosslinkable hydrophilic polymeric material which comprises azetidinium-containing monomeric units derived from at least one azetidinium-containing vinylic monomer, reactive monomeric units derived from a vinylic monomer having an amino or carboxyl group, and hydrophilic monomeric units derived from a hydrophilic vinylic monomer, wherein the silicone hydrogel contact lens has an oxygen permeability of at least about 40 barrers, a surface wettability characterized by a water contact angle of about 100 degrees or less, and a good coating durability characterized by surviving a digital rubbing test.
  • a thermally- crosslinkable hydrophilic polymeric material which comprises azetidinium-containing monomeric units derived from at least one azetidinium-containing
  • the invention provides an ophthalmic product, which comprises a sterilized and sealed lens package, wherein the lens package comprises: a post-autoclave lens packaging solution and a readily-usable silicone hydrogel contact lens immersed therein, wherein the readily-usable silicone hydrogel contact lens comprises a crosslinked hydrophilic coating obtained by autoclaving an original silicone hydrogel contact lens having amino groups and/or carboxyl groups on and/or near the surface of the original silicone hydrogel contact lens in a pre-autoclave packaging solution containing a water-soluble and thermally- crosslinkable hydrophilic polymeric material which comprises from 0.001 % to about 25% by mole of azetidinium-containing monomeric units derived from at least one azetidinium- containing vinylic monomer, wherein the hydrophilic polymeric material is covalently attached onto the silicone hydrogel contact lens through second covalent linkages each formed between one amino or carboxyl group on and/or near the surface of the silicone hydrogel contact lens and one azeti
  • FIG 1 shows polyhexamethylene biguanide (PHMB) uptakes and releases by various contact lenses.
  • PHMB polyhexamethylene biguanide
  • a “silicone hydrogel contact lens” refers to a contact lens comprising a silicone hydrogel material.
  • a “silicone hydrogel” refers to a crosslinked silicone-containing polymeric material which can absorb at least 10 percent by weight of water when it is fully hydrated and is obtained by copolymerization of a polymerizable composition comprising at least one silicone-containing vinylic monomer or at least one silicone-containing vinylic macromer or at least one silicone-containing prepolymer having ethylenically unsaturated groups.
  • hydrogel or “hydrogel material” refers to a crosslinked polymeric material which is not water-soluble and can contains at least 10% by weight of water within its polymer matrix when fully hydrated.
  • non-silicone hydrogel refers to a hydrogel that is theoretically free of silicon.
  • a "vinylic monomer”, as used herein, refers to a compound that has one sole ethylenically unsaturated group and can be polymerized actinically or thermally.
  • exemplary ethylenically unsaturated groups include without limitation (meth)acryloyl methacryloyl (— allyl, vinyl
  • (meth)acrylamide refers to methacrylamide and/or acrylamide.
  • (meth)acrylate refers to methacrylate and/or acrylate.
  • hydrophilic vinylic monomer refers to a vinylic monomer which as a homopolymer typically yields a polymer that is water-soluble or can absorb at least 10 percent by weight water.
  • hydrophobic vinylic monomer refers to a vinylic monomer which as a homopolymer typically yields a polymer that is insoluble in water and can absorb less than 10 percent by weight water.
  • the term "macromer” or “prepolymer” refers to a medium and high molecular weight compound or polymer that contains two or more ethylenically unsaturated groups.
  • Medium and high molecular weight typically means average molecular weights greater than 700 Daltons.
  • crosslinker refers to a compound having at least two ethylenically unsaturated groups.
  • a “crosslinking agent” refers to a crosslinker having a molecular weight of about 700 Daltons or less.
  • polymer means a material formed by polymerizing/crosslinking one or more monomers or macromers or prepolymers.
  • molecular weight of a polymeric material (including monomeric or macromeric materials) refers to the weight-average molecular weight unless otherwise specifically noted or unless testing conditions indicate otherwise.
  • amino group refers to a primary or secondary amino group of formula -NHR', where R' is hydrogen or a C1-C20 unsubstituted or substituted, linear or branched alkyl group, unless otherwise specifically noted.
  • carboxyl-containing vinylic monomer refers to a vinyl monomer having a carboxyl group (-COOH).
  • amino-containing vinylic monomer refers to a vinyl monomer having an amino group.
  • azetidinium refers to a positively-charged, trivalent radical (or group) of in which T 1 ; T 2 and T 3 are a direct bond.
  • phosphorylcholine refers to a zwitterionic group of in which n is an integer of 1 to 5 and R-i , R 2 and R 3 independently of each other are C-
  • azlactone refers to a mono-valent radical of , in which p is 0 or 1 ; T 4 and T 5 independently of each other is an alkyl group having 1 to 14 carbon atoms, a cycloalkyl group having 3 to 14 carbon atoms, an aryl group having 5 to 12 ring atoms, an arenyl group having 6 to 26 carbon and 0 to 3 sulfur, nitrogen and/or oxygen atoms, or T 4 and T 5 taken together with the carbon to which they are joined can form a carbocyclic ring containing 5 to 8 ring atoms.
  • non-reactive hydrophilic vinylic monomer refers to a hydrophilic vinylic monomer free of carboxyl or amino group.
  • polysiloxane segment refers to a bivalent radical having the formula
  • R 4 , R 5 , R 6 , R 7 , Re , R9, R10, R11 independently of one another, are C1-C10 alkyl, C1-C4 alkyl- or C1-C4- alkoxy-substituted phenyl, C1-C10 fluoroalkyl, C1-C10 fluoroether, C 6 -Ci 8 aryl radical, -alk-(OC2H 4 ) n i-OR9 in which alk is CrC 6 - alkylene divalent radical, R 9 is H or C1-C4 alkyl and n1 is an integer from 1 to 10, ml and m2 independently of each other are an integer of from 0 to 50 and (m1 +m2) is from 1 to 100.
  • water-soluble in reference to a polymer means that the polymer can be dissolved in water to an extent sufficient to form an aqueous solution of the polymer having a concentration of from about 0.05% to about 30% by weight at room temperature (e.g., from about 22 °C to about 28°C).
  • a “water contact angle” refers to an average water contact angle (i.e., contact angles measured by Sessile Drop method), which is obtained by averaging measurements of contact angles with at least 3 individual contact lenses.
  • intactness in reference to a coating on a silicone hydrogel contact lens is intended to describe the extent to which the contact lens can be stained by Sudan Black in a Sudan Black staining test described in Example 1 .
  • Good intactness of the coating on a silicone hydrogel contact lens means that there is practically no Sudan Black staining of the contact lens.
  • durability in reference to a coating on a silicone hydrogel contact lens is intended to describe that the coating on the silicone hydrogel contact lens can survive a digital rubbing test.
  • surviving a digital rubbing test or “surviving a durability test” in reference to a coating on a contact lens means that after digitally rubbing the lens according to a procedure described in Example 1 , water contact angle on the digitally rubbed lens is still about 100 degrees or less, preferably about 90 degrees or less, more preferably about 80 degrees or less, most preferably about 70 degrees or less.
  • 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 hydrogel (silicone or non-silicone) or a contact lens means a measured oxygen permeability (Dk) which is corrected for the surface resistance to oxygen flux caused by the boundary layer effect according to the procedures described in Example 1 of
  • 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 lonoflux Diffusion Coefficient.
  • the lonoflux Diffusion Coefficient, D 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].
  • Optically compatible refers to a material or surface of a material which may be in intimate contact with the ocular environment for an extended period of time without significantly damaging the ocular environment and without significant user discomfort.
  • ophthalmically safe with respect to a packaging solution for sterilizing and storing contact lenses is meant that a contact lens stored in the solution is safe for direct placement on the eye without rinsing after autoclave and that the solution is safe and sufficiently comfortable for daily contact with the eye via a contact lens.
  • An ophthalmically- safe packaging solution after autoclave has a tonicity and a pH that are compatible with the eye and is substantially free of ocularly irritating or ocularly cytotoxic materials according to international ISO standards and U.S. FDA regulations.
  • organic-based solution refers to a solution which is a homogeneous mixture consisting of an organic-based solvent and one or more solutes dissolved in the organic based solvent.
  • organic-based coating solution refers to an organic-based solution containing at least one polymeric coating material as a solute in the solution.
  • organic-based solvent is intended to describe a solvent system which consists of one or more organic solvents and optionally about 40% or less, preferably about 30% or less, more preferably about 20% or less, even more preferably about 10% or less, in particular about 5% or less by weight of water relative to the weight of the solvent system.
  • the invention is generally related to azetidinium-containing copolymers and their uses in forming a non-silicone hydrogel coating on a silicone hydrogel (SiHy) contact lens.
  • An azetidinium-containing copolymer of the invention can be tailored to have desired degrees of hydrophilicity/hydrophobicity and/or azetidinium contents.
  • Such azetidinium- containing copolymers can be used as an anchoring polymer and/or an reactive hydrophilic polymer for forming a hydrogel coating, according to thermally-induced reaction mechanism involving an azetidnium group as illustrated in Scheme I
  • T 1 ; T 2 and T 3 independent of one another are a direct bond;
  • T 6 is a polymer chain or a to C 20 alkyl unsubstituted or substituted, linear or branched alkyl group.
  • Such a reaction can be carried out conveniently and directly in a lens package during autoclave (i.e., heating the lens package with the lens in a packaging solution about 1 18°C to about 125°C for approximately 20-40 minutes under pressure) which is a commonly-used sterilization process in the contact lens industry.
  • the invention in one aspect, provides one class of azetidinium-containing vinylic monomers of formula (1 ) in which: R" is hydrogen or methyl; T 7 and T 8 independent of each other are C-i to C 14 alkyl group; Yi , Y 2 , and Y 3 independent of one other are a linkage selected from the group consisting of a direct bond, -0-, -NR'-, -C(0)-NR'-, -NR'-C(O)-, -0-C(0)-NH- -NH- C(0)-0- -NR'-C(0)-NH- -NH-C(0)-NR'-, -C(0)-0-, -O-C(O)-, -NH-C(O)-NH-Z 0 - NH-C(0)-N H- -0-C(0)-NH-Zo-NH-C(0)-0- -O-C(O)-NH-Z 0 -NH-C(O)-N H- and - NH-C(0)-
  • An azetidinium-containing vinylic monomer of the invention can be prepared according to a two-step process.
  • a di-alkylamine HNT 7 T 8
  • HNT 7 T 8 a di-alkylamine
  • T 8 independent of each other are C-i to C 14 alkyl group.
  • the resultant azetidinium compound reacts, in the absence of a coupling agent, with an ethylenically functionalizing vinylic monomer selected from the group consisting of (meth)acrylic acid halide (chloride, bromide, or iodide), (meth)acrylic anhydride, maleic anhydride, an epoxy- containing vinylic monomer, a C 2 -C 6 isocyanatoalkyi (meth)acrylate, an aziridine-containing vinylic monomer, and an aziactone-containing vinylic monomer, under well-known conditions of coupling reactions between one hydroxyl group and one other functional group (acid halide group, acid anhydride group, epoxy group, isocyanate group, azeridine group, or azlactone group).
  • an ethylenically functionalizing vinylic monomer selected from the group consisting of (meth)acrylic acid halide
  • the resultant azetidinium compound reacts, in the presence of a coupling agent (e.g., a diisocyanate compound, a di-acid halide compound, a di- azlactone compound, or a di-epoxy compound), with an ethylenically functionalizing vinylic monomer selected from the group consisting of C 2 to C 6 hydroxylalkyl (meth)acrylate, C 2 to C 6 hydroxyalkyi (meth)acrylamide, allylalcohol, allylamine, amino-C 2 -C 6 alkyl (meth)acrylate, vinylamine, amino-C 2 -C 6 alkyl (meth)acrylamide, acrylic acid, and C1-C4 alkylacrylic acid (e.g., methacrylic ethylacrylic acid, propylacrylic acid, butylacrylic acid), under well-known coupling-reaction conditions.
  • a coupling agent e.g., a diis
  • a “coupling reaction” is intended to describe any reaction between a pair of matching functional groups in the presence or absence of a coupling agent to form covalent bonds or linkages under various reaction conditions well known to a person skilled in the art, such as, for example, oxidation-reduction conditions, dehydration condensation conditions, addition conditions, substitution (or displacement) conditions, Diels-Alder reaction conditions, cationic crosslinking conditions, ring-opening conditions, epoxy hardening conditions, and
  • Non-limiting examples of coupling reactions under various reaction conditions between a pair of co-reactive functional groups are given below for illustrative purposes.
  • a hydroxyl group reacts with an acid chloride or bromide group or with an acid anhydride group to form an ester linkage (-C(O)-O-);
  • a hydroxyl (or hydroxy) reacts with an isocyanate to form a urethane linkage;
  • a hydroxyl reacts with an epoxy or aziridine to form a OH- or NH 2 -containing ether linkage (-CH(OH)-CH 2 -0- or -CH(NH 2 ) - CH 2 -0-);
  • a hydroxyl group reacts with an azlactone group in the presence of a catalyst to form an amidoalkylenecarboxy linkage (-OC(0)-(CH 2 )p-CT 4 T5-C(0)-NH-);
  • an amino group reacts with aldehyde group to form a Schiff base
  • C 4 -C 24 diisocyanates can be used in the invention.
  • preferred diisocyanates include without limitation isophorone diisocyanate, hexamethyl-1 ,6- diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, toluene diisocyanate, 4,4'-diphenyl diisocyanate, 4,4'-diphenylmethane diisocyanate, p-phenylene diisocyanate, 1 ,4-phenylene 4,4'-diphenyl diisocyanate, 1 ,3-bis-(4,4'-isocyanto methyl) cyclohexane, cyclohexane diisocyanate, and combinations thereof.
  • diacid halides can be used in the invention.
  • suitable diacid halide include without limitations fumaryl chloride, suberoyl chloride, succinyl chloride, phthaloyl chloride, isophthaloyl chloride, terephthaloyl chloride, sebacoyl chloride, adipoyl chloride, trimethyladipoyl chloride, azelaoyl chloride, dodecanedioic acid chloride, succinic chloride, glutaric chloride, oxalyl chloride, dimer acid chloride, and combinations thereof.
  • any suitable di-epoxy compounds can be used in the invention.
  • preferred di-epoxy compounds are neopentyl glycol diglycidyl ether, 1 ,4-butanediol diglycidyl ether, 1 ,6-hexanediol diglycidyl ether, glycerol diglycidyl ether, ethylene glycol diglycidyl ether, diethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, dipropylene glycol diglycidyl ether, and combinations thereof.
  • Such di-epoxy compounds are available commercially (e.g., those DENACOL series di-epoxy compounds from Nagase ChemteX Corporation).
  • Any suitable C 10 -C 2 4 di-azlactone compounds can be used in the invention.
  • Examples of such diazlactone compounds are those described in U.S. Patent No. 4,485,236 (herein incorporated by reference in its entirety).
  • aziridine-containing vinylic monomers include without limitation 3-(1 -aziridinyl) propyl (meth)acrylate, 4-(1-aziridinyl) butyl (meth)acrylate, 6-(1 - aziridinyl) hexyl (meth)acrylate, and 8-(1 -aziridinyl) octyl (meth)acrylate).
  • epoxy-containing vinylic monomers include without limitation glycidyl (meth)acrylate, vinyl glycidyl ether, and allyl glycidyl ether.
  • azlactone-containing vinylic monomers include without limitation 2-vinyl-4,4-dimethyl-1 ,3-oxazolin-5-one, 2-isopropenyl-4,4-dimethyl-1 ,3-oxazolin-5- one, 2-vinyl-4-methyl-4-ethyl-1 ,3-oxazolin-5-one, 2-isopropenyl-4-methyl-4-butyl-1 ,3- oxazolin-5-one, 2-vinyl-4,4-dibutyl-1 ,3-oxazolin-5-one, 2-isopropenyl-4-methyl-4-dodecyl-1 ,3- oxazolin-5-one, 2-isopropenyl-4,4-diphenyl-1 ,3-oxazolin-5-one, 2-isopropenyl-4,4- pentamethylene-1 ,3-oxazolin-5-one, 2-isopropenyl-4,
  • This aspect of the invention also is related to another class of azetidinium-containing vinylic monomers of the invention represented by formula (2)
  • R is hydrogen or methyl
  • Y 4 is a linkage selected from the group consisting of a direct bond, -0-, -NR'-, -C(O)- NR'-, -NR'-C(O)-, -0-C(0)-NH- -NH-C(0)-0- -NR'-C(0)-NH- -NH-C(0)-NR'-, - C(0)-0- -O-C(O)-, R' is hydrogen, a C C 2 o unsubstituted or substituted, linear or branched alkyl group; Z 4 , is a direct bond, a C1-C2 0 unsubstituted or substituted, linear or branched alkylene divalent radical optionally containing therein one or more linkages of -O-, -NR'-, and -C(O)-, a C1-C7 alkyleneoxy C
  • This class of azetidinium-containing vinylic monomers can be prepared by reacting epichlorohydrin directly with a vinylic monomer having a secondary amine group (-NH-) under reaction conditions known to a person skilled in the art.
  • vinylic monomers includes without limitation: N-allyl Ci-Ci 2 alkanamine (e.g., N-ethyl-2-methylallylamine, N- ethylallylamine, N-allylmethylamine, N-allyl-1-pentanamine, N-allyl-2-methyl-1-pentanamine, N-Allyl-2,3-dimethyl-1 -pentanamine, N-allyl-1 -hexanamine, N-allyl-2-methyl-1 -hexanamine, N-allyl-1-heptanamine, N-allyl-1 -octanamine, N-allyl-1 -ecanamine, N-allyl-1-dodecanamine); a secondary amine-containing vinylic monomer which is obtained either
  • An azetidinium-containing vinylic monomer of the invention can find particular use in preparing copolymers suitable for forming non-silicone hydrogel coatings on SiHy contact lenses and/or for forming an anchoring prime coating on SiHy contact lenses.
  • the invention in another aspect, provides an azetidinium-containing copolymer comprising azetidinium-containing monomeric units derived from at least one vinylic monomer having an azetidinium group (preferably from an azetidinium-containing vinylic monomer of formula (1 ) or (2) as described above) and monomeric units derived from at least one vinylic monomer selected from the group consisting of a carboxyl-containing vinylic monomer, an amino-containing vinylic monomer, a hydrophobic vinylic monomer, and combination thereof.
  • Examples of preferred carboxyl-containing vinylic monomers include without limitation acrylic acid, a CrC 4 -alkyl acrylic acid (e.g., methacrylic acid, ethylacrylic acid, propylacrylic acid, butylacrylic acid), ⁇ , ⁇ -2-acrylamidoglycolic acid, beta methyl-acrylic acid (crotonic acid), alpha-phenyl acrylic acid, beta-acryloxy propionic acid, sorbic acid, angelic acid, cinnamic acid, 1 -carobxy-4-phenyl butadiene-1 ,3, itaconic acid, citraconic acid, mesaconic acid, glutaconic acid, aconitic acid, maleic acid, fumaric acid, and combination thereof.
  • acrylic acid e.g., methacrylic acid, ethylacrylic acid, propylacrylic acid, butylacrylic acid
  • ⁇ , ⁇ -2-acrylamidoglycolic acid beta methyl-acrylic acid (crot
  • amino-containing vinylic monomers examples include amino-C 2 -C 4 alkyl (meth)acrylate, allylamine, vinylamine, amino-C-i-C 4 alkyl (meth)acrylamide, N-allyl C 1 -C 12 alkanamine (e.g., N-ethyl-2-methylallylamine, N-ethylallylamine, N-allylmethylamine, N-allyl- 1-pentanamine, N-allyl-2-methyl-1 -pentanamine, N-allyl-2,3-dimethyl-1 -pentanamine, N-allyl-
  • an epoxy compound having one sole epoxy group e.g., 1 ,2-epoxy C 3 -C 12 alkanes, or mono-
  • hydrophobic vinylic monomers examples include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, butyl (meth)acrylate, sec-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, cyclohexylacrylate,
  • methacrylonitrile vinyl toluene, vinyl ethyl ether, perfluorohexylethyl-thio-carbonyl- aminoethyl-methacrylate, isobornyl methacrylate, trifluoroethyl methacrylate, hexafluoro- isopropyl methacrylate, hexafluorobutyl methacrylate, siloxane-containing vinylic monomer, a polysiloxane-containing vinylic monomer (having about 3 to about 40 silicone atoms), and combinations thereof.
  • siloxane-containing vinylic monomers examples include N- [tris(trimethylsiloxy)silylpropyl]-(meth)acrylamide, N-[tris(dimethylpropyl-siloxy)silylpropyl] (meth)acrylamide, N-[tris(dimethylphenylsiloxy)-silylpropyl] (meth)acrylamide, N- [tris(dimethylethylsiloxy)silylpropyl] (meth)acrylamide, N-(2-hydroxy-3-(3-(bis(trimethyl- silyloxy)methylsilyl)propyloxy)propyl)-2-methyl acrylamide, N-(2-hydroxy-3-(3-(bis(trimethyl- silyloxy)methylsilyl)propyloxy)propyl) acrylamide, N,N-bis[2-hydroxy-3-(3- (bis(trimethylsilyloxy) methylsilyl)propyloxy)propyl]-2-
  • polysiloxane-containing vinylic monomer refers to a vinylic monomer comprising one sole ethylenically-unsaturated group and at least one poly(di-CrC 6 alkyl-substituted siloxane) segment.
  • Examples of preferred polysiloxane-containing vinylic monomer having about 3 to about 40 silicone atoms include mono-(meth)acrylate-terminated
  • polydimethylsiloxanes of various molecular weight e.g., mono-3-methacryloxypropyl terminated, mono-Ci-C 4 alkyl terminated polydimethylsiloxane, or mono-(3-methacryloxy-2- hydroxypropyloxy)propyl terminated, mono-C-i-C 4 alkyl terminated polydimethylsiloxane
  • mono-vinyl-terminated polydimethylsiloxanes mono-(meth)acrylamide-terminated
  • polydimethylsiloxanes mono-vinylcarbamate-terminated polydimethylsiloxanes, mono- vinylcarbonate-terminated polydimethylsiloxanes, and combinations thereof.
  • monoethylenically functionalized polysiloxanes can be obtained by ethylenically
  • Suitable monofunctionalized polysiloxanes are commercially available, e.g., from Aldrich, ABCR GmbH & Co., Fluorochem, or Gelest, Inc, Morrisville, PA.
  • the hydrogen dissociation constants are about 4.0 for polyacrylic acid, about 5.3 for polymethacrylic acid, about 6.3 for polyethylacrylic acid, about 6.7 for polypropylacrylic acid, and about 7.4 for polybutylacrylic acid (see, H. Dong, J. Phys. Chem. A 1 12 (49): 12687-12694 (2008); F. Mitsuko, R. Grubbs, and J.D. Baldeschwieler, J. Colloid Interface Sci. 185: 210-216 (1997); S.J. Grainger and E.H.
  • azetidinium-containing polymer for a coating on a SiHy contact lens is composed primarily of methacrylic acid or ethylacrylic acid, the uptake of those positively-charged antimicrobial agents present in lens care solutions can be minimized.
  • an azetidinium-containing copolymer of the invention preferably comprises: azetidinium-containing monomeric units derived from at least one azetidinium-containing vinylic monomer of formula (1 ) or (2) (as described above); and carboxyl-containing monomeric units derived from a carboxyl-containing vinylic monomer (preferably selected from the group consisting of acrylic acid, methacrylic acid, ethylacrylic acid, propylacrylic acid, maleic acid, and combinations thereof, more preferably selected from the group consisting of methacrylic acid, ethylacrylic acid, and combination thereof, even more preferably derived from methacrylic acid); and optionally amino-containing monomeric units derived from at least one amino-containing vinylic monomer [preferably selected from the group consisting of amino-C 2 -C 4 alkyl (meth)acrylate, allylamine, vinylamine, amino-C-i-C 4 alkyl (meth)acrylamide, N-
  • epoxy-containing vinylic monomer e.g., glycidyl (meth)acrylate, vinyl glycidyl ether, or allyl glycidyl ether
  • an azetidinium-containing copolymer of the invention preferably comprises: azetidinium-containing monomeric units derived from at least one azetidinium-containing vinylic monomer of formula (1 ) or (2) (as described above);
  • carboxyl-containing monomeric units derived from a carboxyl-containing vinylic monomer preferably selected from the group consisting of acrylic acid, methacrylic acid, ethylacrylic acid, propylacrylic acid, maleic acid, and combinations thereof (more preferably selected from the group consisting of methacrylic acid, ethylacrylic acid, and combination thereof, even more preferably derived from methacrylic acid); and hydrophobic monomeric units derived from at least one hydrophobic vinylic monomer (preferably selected from the group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, butyl (meth)acrylate, sec-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, cyclohexylacrylate, 2-ethylhexylacrylate, vinyl acetate, vinyl prop
  • an azetidinium-containing copolymer of the invention preferably comprises: azetidinium-containing monomeric units derived from at least one azetidinium-containing vinylic monomer of formula (1 ) or (2) (as described above);
  • hydrophobic monomeric units derived from at least one hydrophobic vinylic monomer (preferably selected from the group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, butyl (meth)acrylate, sec-butyl
  • (meth)acrylate isobutyl (meth)acrylate, t-butyl (meth)acrylate, cyclohexylacrylate, 2- ethylhexylacrylate, 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, hexafluorobutyl methacrylate, siloxane-containing vinylic monomer, a polysiloxane-containing vinylic monomer having about 3 to
  • N-allyl C1-C12 alkanamine e.g., N-ethyl-2-methylallylamine, N- ethylallylamine, N-allylmethylamine, N-allyl-1-pentanamine, N-allyl-2-methyl-1-pentanamine, N-allyl-2,3-dimethyl-1 -pentanamine, N-allyl-1 -hexanamine, N-allyl-2-methyl-1 -hexanamine, N-allyl-1-heptanamine, N-allyl-1 -octanamine, N-allyl-1 -ecanamine, N-allyl-1-dodecanamine), a coupling reaction product of an epoxy compound having one sole epoxy group (e.g., 1 ,2- epoxy C 3 -C 12 alkanes, or mono-epoxy terminated polyethyleneglycol) with allylamine, vinylamine, amino-C 2 -C 6 alkyl (meth)acrylate, or amino-
  • an azetidinium-containing copolymer of the invention preferably comprises: (1 ) azetidinium-containing monomeric units derived from at least one azetidinium-containing vinylic monomer of formula (1 ) or (2) (as described above); (2) reactive monomeric units which are carboxyl-containing monomeric units and/or amino- containing monomeric units, wherein the carboxyl-containing monomeric units are derived from at least one carboxyl-containing vinylic monomer (any one of the those described above) and wherein the amino-containing vinylic monomeric units are derived from at least one amino-containing vinylic monomer (any one of those described above); and (3) at least about 50%, preferably at least about 60%, more preferably at least about 70%, even more preferably at least about 75% by moles of non-reactive hydrophilic monomeric units derived from at least one hydrophilic vinylic monomer selected from the group consisting of
  • a sugar-containing vinylic monomer e.g., erythritol (meth)acrylate, arabitol (meth)acrylate, mannitol (meth)acrylate, ducitol (meth)acrylate, fucitol (meth)acrylate, iditol (meth)acrylate, innositol (meth)acrylate, xylitol (meth)acrylate, sorbitol (meth)acrylate, glucose (meth)acrylate, fructose (meth)acrylate, galactose (meth)acrylate, and combinations thereof (preferably selected from the group consisting of (meth)acrylamide, N,N-dimethyl (meth)acrylamide, N-vinylpyrrolidone, ⁇ , ⁇ ,-dimethylaminoethyl (meth)acrylate,
  • the copolymer comprises up to about 50%, preferably from about 2.5% to about 40%, more preferably from about 5% to about 30%, even more preferably from about 7.5% to about 25% by moles of azetidinium- containing monomeric units and reactive monomeric units.
  • the weight average molecular weight M w of an azetidinium-containing copolymer of the invention is at least about 10,000 Daltons, preferably at least about 50,000 Daltons, more preferably at least about 100,000 Daltons, even more preferably from about 200,000 to about 1 ,000,000 Daltons.
  • An azetidinium-containing copolymer of the invention can find particular use in forming crosslinked hydrophilic coatings on SiHy contact lenses.
  • the invention in a further aspect, provides a method for producing coated silicone hydrogel contact lenses each having a crosslinked hydrophilic coating thereon, the method of invention comprising the steps of: (a) obtaining a silicone hydrogel contact lens; (b) applying a prime coating of an anchoring polymer onto the silicone hydrogel contact lens, wherein the anchoring polymer is a homopolymer or copolymer of a carboxyl-containing vinylic monomer and/or an azetidinium-containing copolymer which comprises first azetidinium-containing monomeric units derived from at least one azetidinium-containing vinylic monomer (preferably of formula (1 ) or (2) as described above) and monomeric units selected from the group consisting of carboxyl-containing monomeric units derived from at least one carboxyl-containing vinylic monomer (any one of those described above
  • contact lenses 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, or by lathe cutting of silicone hydrogel buttons as used in making customized contact lenses.
  • a lens formulation typically is dispensed into molds and cured (i.e., polymerized and/or crosslinked) in molds for making contact lenses.
  • a SiHy contact lens formulation can also comprise other necessary components known to a person skilled in the art, such as, for example, a UV-absorbing agent, a visibility tinting agent (e.g., dyes, pigments, or mixtures thereof), antimicrobial agents (e.g., preferably silver nanoparticles), a bioactive agent, leachable lubricants, leachable tear-stabilizing agents, and mixtures thereof, as known to a person skilled in the art.
  • Resultant SiHy contact lenses then can be subjected to extraction with an extraction solvent to remove unpolymerized components from the resultant lenses and to hydration process, as known by a person skilled in the art.
  • a preformed SiHy contact lens can be a colored contact lens (i.e., a SiHy contact lens having at least one colored patterns printed thereon as well known to a person skilled in the art).
  • SiHy lens formulations including various combinations of components described above have been described in numerous patents and patent applications published by the filing date of this application. All of them can be used in obtaining a SiHy lens to be coated.
  • a SiHy lens formulation for making commercial SiHy lenses such as, lotrafilcon A, lotrafilcon B, delefilcon A, balafilcon A, galyfilcon A, senofilcon A, narafilcon A, narafilcon B, comfilcon A, enfilcon A, asmofilcon A, or the like, can also be used in making SiHy contact lenses to be coated in this invention.
  • a prime coating is formed by contacting a SiHy contact lens (to be coated) with a solution of an anchoring polymer.
  • Contacting of the contact lens with a solution of an anchoring polymer can occur by dipping it into the coating solution or by spraying it with the coating solution.
  • One contacting process involves solely dipping the contact lens in a bath of a solution of the anchoring polymer for a period of time or alternatively dipping the contact lens sequentially in a series of bath of solutions of the anchoring polymer for a fixed shorter time period for each bath.
  • Another contacting process involves solely spray a solution of the anchoring polymer.
  • a number of alternatives involve various combinations of spraying- and dipping- steps may be designed by a person having ordinary skill in the art.
  • the contacting time of a contact lens with a solution of the anchoring polymer may last up to about 10 minutes, preferably from about 5 to about 360 seconds, more preferably from about 5 to about 250 seconds, even more preferably from about 5 to 200 seconds.
  • the anchoring polymer is a linear or branched or crosslinked polymer, so long as it is soluble in water, an organic solvent, a mixture of two or more organic solvents, a mixture of water with one or more organic solvent.
  • an anchoring polymer of the invention preferably comprises carboxyl-containing monomeric units derived from a carboxyl-containing vinylic monomer preferably selected from the group consisting of acrylic acid, methacrylic acid, ethylacrylic acid, propylacrylic acid, maleic acid, and combinations thereof, more preferably selected from the group consisting of methacrylic acid, ethylacrylic acid, and combination thereof, even more preferably derived from methacrylic acid.
  • the anchoring polymer is: polyacrylic acid (PAA); polymethacrylic acid (PMAA); polyethylacrylic acid, polypropylacrylic acid; a copolymer of at least two vinylic monomers selected from the group consisting of acrylic acid, methacrylic acid, ethylacrylic acid, and propylacrylic acid; polymaleic acid (i.e., partially or fully hydrolyzed polymaleic anhydride); a copolymer of maleic acid and one or more vinylic monomers (e.g., ethylene, methyl vinyl ether, vinyl acetate, and/or isobutylene); a copolymer composed of from about 0.05% to about 20% (preferably from about 0.1 % to about 15%, more preferably from about 0.5% to about 10%) by moles of an azetidinium-containing vinylic monomer (preferably an azetidinium-containing vinylic monomer of formula (1 ) as described above) and of from about 80% to about
  • PAA
  • vinylic monomers e.g., ethylene, methyl vinyl ether, vinyl acetate, and/or isobutylene
  • an anchoring polymer of the invention preferably comprises: carboxyl-containing monomeric units derived from a carboxyl-containing vinylic monomer preferably selected from the group consisting of acrylic acid, methacrylic acid, ethylacrylic acid, propylacrylic acid, maleic acid, and combinations thereof (more preferably selected from the group consisting of methacrylic acid, ethylacrylic acid, and combination thereof, even more preferably derived from methacrylic acid); and azetidinium-containing monomeric units derived from at least one azetidinium-containing vinylic monomer of formula (1 ) or (2) (as described above).
  • an anchoring polymer of the invention preferably comprises: carboxyl-containing monomeric units derived from a carboxyl-containing vinylic monomer preferably selected from the group consisting of acrylic acid, methacrylic acid, ethylacrylic acid, propylacrylic acid, maleic acid, and combinations thereof (more preferably selected from the group consisting of methacrylic acid, ethylacrylic acid, and combination thereof, even more preferably derived from methacrylic acid); azetidinium-containing monomeric units derived from at least one azetidinium-containing vinylic monomer of formula (1 ) or (2) (as described above); and hydrophobic monomeric units derived from at least one hydrophobic vinylic monomer (preferably from at least one siloxane-containing vinylic monomer and/or at least one polysiloxane-containing vinylic monomer).
  • an anchoring polymer of the invention preferably comprises: azetidinium-containing monomeric units derived from at least one azetidinium- containing vinylic monomer of formula (1 ) or (2) (as described above); and hydrophobic monomeric units derived from at least one hydrophobic vinylic monomer (preferably from at least one siloxane-containing vinylic monomer and/or at least one polysiloxane-containing vinylic monomer).
  • an anchoring polymer of the invention preferably comprises: carboxyl-containing monomeric units derived from a carboxyl-containing vinylic monomer preferably selected from the group consisting of acrylic acid, methacrylic acid, ethylacrylic acid, propylacrylic acid, maleic acid, and combinations thereof (more preferably selected from the group consisting of methacrylic acid, ethylacrylic acid, and combination thereof, even more preferably derived from methacrylic acid); and and hydrophobic monomeric units derived from at least one hydrophobic vinylic monomer (preferably from at least one siloxane-containing vinylic monomer and/or at least one polysiloxane-containing vinylic monomer).
  • the weight average molecular weight M w of an anchoring polymer for forming an anchoring prime coating is at least about 10,000 Daltons, preferably at least about 50,000 Daltons, more preferably at least about 100,000 Daltons, even more preferably from about 200,000 to about 1 ,000,000 Daltons.
  • a solution of an anchoring polymer for forming a prime coating on contact lenses can be prepared by dissolving one or more anchoring polymers in water, a mixture of water and an organic solvent miscible with water, an organic solvent, or a mixture of one or more organic solvent.
  • the anchoring polymer is dissolved in a mixture of water and one or more organic solvents, an organic solvent, or a mixture of one or more organic solvent. It is believed that a solvent system containing at least one organic solvent can swell a silicone hydrogel contact lens so that a portion of the anchoring polymer may penetrate into the silicone hydrogel contact lens and increase the durability of the prime coating.
  • organic solvents can be used in preparation of a solution of an anchoring polymer.
  • organic solvents include without limitation tetrahydrofuran, tripropylene glycol methyl ether, dipropylene glycol methyl ether, ethylene glycol n-butyl ether, ketones (e.g., acetone, methyl ethyl ketone, etc.), diethylene glycol n-butyl ether, diethylene glycol methyl ether, ethylene glycol phenyl ether, propylene glycol methyl ether, propylene glycol methyl ether acetate, dipropylene glycol methyl ether acetate, propylene glycol n-propyl ether, dipropylene glycol n-propyl ether, tripropylene glycol n-butyl ether, propylene glycol n-butyl ether, dipropylene glycol n-butyl ether, tripropylene glycol n-butyl ether
  • the water-soluble, thermally- crosslinkable hydrophilic polymeric material can be any water-soluble polymer so long as it contains reactive groups selected from the group consisting of azetidinium groups, carboxyl groups, amino groups, thiol groups, and combinations thereof.
  • a water-soluble, thermally crosslinkable hydrophilic polymeric material is: (i) an azetidinium-containing copolymer of the invention (as those described above and can be used here) comprising comprises at least about 50%, preferably at least about 60%, more preferably at least about 70%, even more preferably at least about 75% by moles of non-reactive hydrophilic monomeric units derived from at least one hydrophilic vinylic monomer (any one of those described above); (ii) a reaction product of an azetidinium-containing copolymer (as those described above and can be used here) being free of any silicone with at least one hydrophilicity-enhancing agent having at least one reactive functional group selected from the group consisting of amino group, carboxyl group, thiol group, and combinations thereof; (iii) a reaction product of polyaminoamide-epichlorohydrin with at least one hydrophilicity- enhancing agent having at least one reactive functional group selected from the group consisting of amino
  • hydrophilicity-enhancing agent refers to a hydrophilic organic compound or polymer that can reacted with an azetidinium-containing copolymer of the invention to form a product with the hydrophilicity-enhancing agent covalently incorporated therein as hydrophilic moieties and/or hydrophilic chains.
  • Any suitable hydrophilicity-enhancing agents can be used in the invention so long as they contain at least one amino group, at least one carboxyl group, and/or at least one thiol group.
  • hydrophilicity-enhancing agents include without limitation: amino-, carboxyl- or thiol-containing monosaccharides (e.g., 3-amino-1 ,2-propanediol, 1 -thiolglycerol, 5-keto-D-gluconic acid, galactosamine, glucosamine, galacturonic acid, gluconic acid, glucosaminic acid, mannosamine, saccharic acid 1 ,4-lactone, saccharide acid,
  • amino-, carboxyl- or thiol-containing monosaccharides e.g., 3-amino-1 ,2-propanediol, 1 -thiolglycerol, 5-keto-D-gluconic acid, galactosamine, glucosamine, galacturonic acid, gluconic acid, glucosaminic acid, mannosamine, saccharic acid 1 ,4-lactone, saccharide acid,
  • Ketodeoxynonulosonic acid /V-methyl-D-glucamine, 1 -amino-1-deoxy-3-D-galactose, 1 - amino-1-deoxysorbitol, 1-methylamino-1 -deoxysorbitol, N-aminoethyl gluconamide); amino-, carboxyl- or thiol-containing disaccharides (e.g., chondroitin disaccharide sodium salt, di(3- D-xylopyranosyl)amine, digalacturonic acid, heparin disaccharide, hyaluronic acid
  • disaccharides e.g., chondroitin disaccharide sodium salt, di(3- D-xylopyranosyl)amine, digalacturonic acid, heparin disaccharide, hyaluronic acid
  • disaccharide Lactobionic acid
  • amino-, carboxyl- or thiol-containing oligosaccharides e.g., carboxymethyl-3-cyclodextrin sodium salt, trigalacturonic acid
  • hydrophilicity-enhancing agents is hydrophilic polymers having one or more amino, carboxyl and/or thiol groups. More preferably, the content of monomeric units having an amino (-NHR' with R' as defined above), carboxyl (-COOH) and/or thiol (-SH) group in a hydrophilic polymer as a hydrophilicity-enhancing agent is less than about 40%, preferably less than about 30%, more preferably less than about 20%, even more preferably less than about 10%, by weight based on the total weight of the hydrophilic polymer.
  • hydrophilic polymers as hydrophilicity-enhancing agents are amino- or carboxyl-containing polysaccharides, for example, such as,
  • carboxymethylcellulose having a carboxyl content of about 40% or less, which is estimated based on the composition of repeating units,— [C 6 H 1 o-m05(CH 2 C0 2 H) m ]— in which m is 1 to 3
  • carboxyethylcellulose having a carboxyl content of about 36% or less, which is estimated based on the composition of repeating units,— [C 6 H 1 o- m 05(C 2 H 4 C0 2 H) m ]— in which m is 1 to 3)
  • carboxypropylcellulose having a carboxyl content of about 32% or less, which is estimated based on the composition of repeating units,— [C6H 1 o-m05(C 3 H 6 C0 2 H) m ]— , in which m is 1 to 3
  • hyaluronic acid having a carboxyl content of about 1 1 %, which is estimated based on the composition of repeating units,— (C 13 H 2 o0
  • hydrophilic polymers as hydrophilicity-enhancing agents include without limitation: poly(ethylene glycol) (PEG) with mono-amino, carboxyl or thiol group (e.g., PEG-NH 2 , PEG-SH, PEG-COOH); H 2 N-PEG-NH 2 ; HOOC-PEG-COOH; HS- PEG-SH; H 2 N-PEG-COOH; HOOC-PEG-SH; H 2 N-PEG-SH; multi-arm PEG with one or more amino, carboxyl or thiol groups; PEG dendrimers with one or more amino, carboxyl or thiol groups; a diamino- or dicarboxyl-terminated homo- or co-polymer of a non-reactive hydrophilic vinylic monomer; a monoamino- or monocarboxyl-terminated homo- or copolymer of a non-reactive hydrophilic vinylic monomer; a copolymer which
  • polymerization product of a composition comprising (1 ) about 60% by weight or less, preferably from about 0.1 % to about 30%, more preferably from about 0.5% to about 20%, even more preferably from about 1 % to about 15%, by weight of one or more reactive vinylic monomers and (2) at least one non-reactive hydrophilic vinylic monomer and/or at least one phosphorylcholine-containing vinylic monomer; and combinations thereof.
  • Reactive vinylic monomer(s) and non-reactive hydrophilic vinylic monomer(s) are those described previously.
  • a non-reactive hydrophilic vinylic monomer selected from the group consisting of acrylamide (AAm), ⁇ , ⁇ -dimethylacrylamide (DMA), N-vinylpyrrolidone (NVP), N-vinyl-N-methyl acetamide, glycerol (meth)acrylate, hydroxyethyl (meth)acrylate, N-hydroxyethyl
  • (meth)acrylamide CrC 4 -alkoxy polyethylene glycol (meth)acrylate having a weight average molecular weight of up to 400 Daltons, vinyl alcohol, N-methyl-3-methylene-2-pyrrolidone, 1 - methyl-5-methylene-2-pyrrolidone, 5-methyl-3-methylene-2-pyrrolidone, N,N- dimethylaminoethyl (meth)acrylate, ⁇ , ⁇ -dimethylaminopropyl (metha)crylamide,
  • (meth)acryloyloxyethyl phosphorylcholine and combinations thereof; a copolymer which is a polymerization product of a composition comprising (1 ) from about 0.1 % to about 30%, preferably from about 0.5% to about 20%, more preferably from about 1 % to about 15%, by weight of (meth)acrylic acid, C 2 -Ci 2 alkylacrylic acid, vinylamine, allylamine, and/or amino- C 2 -C 4 alkyl (meth)acrylate, and (2) (meth)acryloyloxyethyl phosphorylcholine and/or at least one non-reactive hydrophilic vinylic monomer selected from the group consisting of acrylamide, N,N-dimethylacrylamide, N-vinylpyrrolidone, N-vinyl-N-methyl acetamide, glycerol (meth)acrylate, hydroxyethyl (meth)acrylate, N-hydroxyethyl (meth)acrylamide, C
  • the hydrophilicity-enhancing agent as a hydrophilicity-enhancing agent is PEG-NH 2 ; PEG-SH; PEG-COOH; monoamino-, monocarboxyl-, diamino- or dicarboxyl-terminated polyvinylpyrrolidone; monoamino-, monocarboxyl-, diamino- or dicarboxyl-terminated polyacrylamide; monoamino-, monocarboxyl-, diamino- or dicarboxyl- terminated poly(DMA); monoamino- or monocarboxyl-, diamino- or dicarboxyl-terminated poly(DMA-co-NVP); monoamino-, monocarboxyl-, diamino- or dicarboxyl-terminated poly(NVP-co-N,N-dimethylaminoethyl (meth)acrylate)); monoamino-, monocarboxyl-, diamino- or dicarboxyl
  • PEGs with functional groups and multi-arm PEGs with functional groups can be obtained from various commercial suppliers, e.g., Polyscience, and Shearwater Polymers, inc., etc.
  • Monoamino-, monocarboxyl-, diamino- or dicarboxyl-terminated homo- or copolymers of one or more non-reactive hydrophilic vinylic monomers or of a phosphorylcholine- containing vinylic monomer can be prepared according to procedures described in U.S.
  • a chain transfer agent with an amino or carboxyl group e.g., 2-aminoethanethiol, 2-mercaptopropinic acid, thioglycolic acid, thiolactic acid, or other hydroxymercaptanes, aminomercaptans, or carboxyl-containing mercaptanes
  • optionally other vinylic monomer are copolymerized (thermally or actinically) with a reactive vinylic monomer (having an amino or carboxyl group), in the presence of an free-radical initiator.
  • the molar ratio of chain transfer agent to that of all of vinylic monomers other than the reactive vinylic monomer is from about 1 :5 to about 1 :100, whereas the molar ratio of chain transfer agent to the reactive vinylic monomer is 1 :1.
  • the chain transfer agent with amino or carboxyl group is used to control the molecular weight of the resultant hydrophilic polymer and forms a terminal end of the resultant hydrophilic polymer so as to provide the resultant hydrophilic polymer with one terminal amino or carboxyl group, while the reactive vinylic monomer provides the other terminal carboxyl or amino group to the resultant hydrophilic polymer.
  • a monoamino- or monocarboxyl-terminated homo- or co-polymer of a non-reactive hydrophilic vinylic monomer the non-reactive vinylic monomer, a chain transfer agent with an amino or carboxyl group (e.g., 2-aminoethanethiol, 2-mercaptopropinic acid, thioglycolic acid, thiolactic acid, or other hydroxymercaptanes, aminomercaptans, or carboxyl-containing mercaptanes) and optionally other vinylic monomers are copolymerized (thermally or actinically) in the absence of any reactive vinylic monomer.
  • an amino or carboxyl group e.g., 2-aminoethanethiol, 2-mercaptopropinic acid, thioglycolic acid, thiolactic acid, or other hydroxymercaptanes, aminomercaptans, or carboxyl-containing mercaptanes
  • a copolymer of a non-reactive hydrophilic vinylic monomer refers to a polymerization product of a non-reactive hydrophilic vinylic monomer with one or more additional vinylic monomers.
  • Copolymers comprising a non-reactive hydrophilic vinylic monomer and a reactive vinylic monomer can be prepared according to any well-known radical polymerization methods or obtained from commercial suppliers. Copolymers containing
  • methacryloyloxyethyl phosphorylcholine and carboxyl-containing vinylic monomer can be obtained from NOP Corporation (e.g., LIPIDURE® -A and -AF).
  • the weight average molecular weight M w of the hydrophilic polymer having at least one amino, carboxyl or thiol group is preferably from about 500 to about 1 ,000,000, more preferably from about 1 ,000 to about 500,000.
  • Polyaminoamide-epichlorohydrin (or polyamide-polyamine-epichlorohydrin or polyamide-epichlorohydrin) are commericially available, such as, for example, Kymene® or Polycup ® resins (epichlorohydrin-functionalized adipic acid-diethylenetriamine copolymers) from Hercules or Polycup ® or Servamine® resins from Servo/Delden.
  • PAE can be obtained by reacting epichlorohydrin with a poly(amidoamine) which is a polycondensate derived from a polyamine and a dicarboxylic acid (e.g., adipic acid-diethylenetriamine copolymers).
  • a poly(amidoamine) which is a polycondensate derived from a polyamine and a dicarboxylic acid (e.g., adipic acid-diethylenetriamine copolymers).
  • the reaction between a hydrophilicity-enhancing agent and an azetidinium-containing copolymer of the invention is carried out at a temperature of from about 40°C to about 100°C for a period of time sufficient (from about 0.3 hour to about 24 hours, preferably from about 1 hour to about 12 hours, even more preferably from about 2 hours to about 8 hours) to form a water-soluble and thermally-crosslinkable hydrophilic polymeric material containing reactive functional groups (azetidinium, carboxyl, amino, and/or thiol groups).
  • the thermally-crosslinkable hydrophilic polymeric material is an azetidinium-copolymer of the invention which comprises: (1 ) up to about 50%
  • azetidinium-containing monomeric units derived from at least one azetidinium-containing vinylic monomer of formula (1 ) or (2) as defined above
  • reactive monomeric units at least about 50%, preferably at least about 60%, more preferably at least about 70%, even more preferably at least about 75% by moles of non-reactive hydrophilic monomeric units derived from at least one hydrophilic vinylic monomer selected from the group consisting of
  • a sugar-containing vinylic monomer e.g., erythritol (meth)acrylate, arabitol (meth)acrylate, mannitol (meth)acrylate, ducitol (meth)acrylate, fucitol (meth)acrylate, iditol (meth)acrylate, innositol (meth)acrylate, xylitol (meth)acrylate, sorbitol (meth)acrylate, glucose (meth)acrylate, fructose (meth)acrylate, galactose (meth)acrylate), and
  • the step of heating is performed preferably by autoclaving the silicone hydrogel contact lens immersed in a packaging solution (i.e., a buffered aqueous solution) in a sealed lens package at a temperature of from about 1 18°C to about 125°C for approximately 20-90 minutes.
  • a packaging solution i.e., a buffered aqueous solution
  • the packaging solution is a buffered aqueous solution which is ophthalmically safe after autoclave.
  • Lens packages are well known to a person skilled in the art for autoclaving and storing a soft contact lens. Any lens packages can be used in the invention.
  • a lens package is a blister package which comprises a base and a cover, wherein the cover is detachably sealed to the base, wherein the base includes a cavity for receiving a sterile packaging solution and the contact lens.
  • Lenses are packaged in individual packages, sealed, and sterilized (e.g., by autoclave at about 120°C or higher for at least 30 minutes under pressure) prior to dispensing to users.
  • autoclave at about 120°C or higher for at least 30 minutes under pressure
  • a person skilled in the art will understand well how to seal and sterilize lens packages.
  • a packaging solution contains at least one buffering agent and one or more other ingredients known to a person skilled in the art.
  • other ingredients include without limitation, tonicity agents, surfactants, antibacterial agents, preservatives, and lubricants (e.g., cellulose derivatives, polyvinyl alcohol, polyvinyl pyrrolidone).
  • the packaging solution contains a buffering agent in an amount sufficient to maintain a pH of the packaging solution in the desired range, for example, preferably in a
  • Any known, physiologically compatible buffering agents can be used.
  • Suitable buffering agents as a constituent of the contact lens care composition according to the invention are known to the person skilled in the art. Examples are boric acid, borates, e.g. sodium borate, citric acid, citrates, e.g.
  • potassium citrate bicarbonates, e.g. sodium bicarbonate, TRIS (2-amino-2-hydroxymethyl- 1 ,3-propanediol), Bis-Tris (Bis-(2-hydroxyethyl)-imino-tris-(hydroxymethyl)-methane), bis- aminopolyols, triethanolamine, ACES (N-(2-hydroxyethyl)-2-aminoethanesulfonic acid), BES (N,N-Bis(2-hydroxyethyl)-2-aminoethanesulfonic acid), HEPES (4-(2-hydroxyethyl)-1- piperazineethanesulfonic acid), MES (2-(N-morpholino)ethanesulfonic acid), MOPS (3-[N- morpholino]-propanesulfonic acid), PIPES (piperazine-N,N'-bis(2-ethanesulfonic acid), TES (N-[Tris(hydroxymethyl)methyl]-2
  • each buffer agent in a packaging solution is preferably from 0.001 % to 2%, preferably from 0.01 % to 1 %; most preferably from about 0.05% to about 0.30% by weight.
  • the packaging solution has a tonicity of from about 200 to about 450 milliosmol (mOsm), preferably from about 250 to about 350 mOsm.
  • the tonicity of a packaging solution can be adjusted by adding organic or inorganic substances which affect the tonicity.
  • Suitable occularly acceptable tonicity agents include, but are not limited to sodium chloride, potassium chloride, glycerol, propylene glycol, polyols, mannitols, sorbitol, xylitol and mixtures thereof.
  • a packaging solution of the invention has a viscosity of from about 1 centipoise to about 8 centipoises, more preferably from about 1 .5 centipoises to about 5 centipoises, at 25°C.
  • the packaging solution comprises preferably from about 0.01 % to about 2%, more preferably from about 0.05% to about 1 .5%, even more preferably from about 0.1 % to about 1 %, most preferably from about 0.2% to about 0.5%, by weight of a thermally-crosslinkable hydrophilic polymeric material of the invention.
  • a method of the invention can further comprise, before the step of heating, the steps of: contacting at room temperature the silicone hydrogel contact lens with an aqueous solution of the thermally-crosslinkable hydrophilic polymeric material to form a top layer (i.e., an LbL coating) of the thermally-crosslinkable hydrophilic polymeric material on the surface of the silicone hydrogel contact lens, immersing the silicone hydrogel contact lens with the top layer of the thermally-crosslinkable hydrophilic polymeric material in a packaging solution in a lens package; sealing the lens package; and autoclaving the lens package with the silicone hydrogel contact lens therein to form a crosslinked hydrophilic coating on the silicone hydrogel contact lens. Because of being positively charged, the thermally-crosslinkable hydrophilic polymeric material is believed to be capable of forming, on the prime coating of a silicone hydrogel contact lens, a non- covalently-bound layer through physical interactions.
  • a silicone hydrogel contact lens obtained according a method of the invention has a surface hydrophilicity/wettability characterized by having an averaged water contact angle of preferably about 90 degrees or less, more preferably about 80 degrees or less, even more preferably about 70 degrees or less, most preferably about 60 degrees or less.
  • the invention in another further aspect, provides a method for producing silicone hydrogel contact lenses each having a crosslinked hydrophilic coating thereon, the method of invention comprising the steps of: (a) obtaining a silicone hydrogel contact lens from a lens-forming composition comprising an azetidinium-containing copolymer (as described above) and/or an azetidinium-containing vinylic monomer of formula (1 ) or (2) as defined above; (b) heating the silicone hydrogel contact lens in an aqueous solution in the presence of a water-soluble, thermally-crosslinkable hydrophilic polymeric material comprising reactive groups selected from the group consisting of azetidinium groups, carboxyl groups, amino groups, thiol groups and combinations thereof, to and at a temperature from about 40°C to about 140°C for a period of time sufficient to induce intermolecular and intramolecular crosslinking reactions between one azetidinium group and one amino or carboxyl group, thereby forming a durable non-silicon
  • azetidinium-containing monomeric units may be located on and/or near the surface of the silicone hydrogel contact lens obtained from the lens-forming composition comprising the azetidinium-containing copolymer. Those azetidinium groups on and/or near the lens surface can serve as anchoring sites for attaching the non-silicone hydrogel coating.
  • the azetidinium-containing copolymer is compatible with polymerizable components in the lens-forming composition and comprises azetidinium- containing monomeric units derived from an azetidinium-containing vinylic monomer of formula (1 ) or (2) as defined above and hydrophobic monomeric units derived from a hydrophobic vinylic monomer. More preferably, the azetidinium-containing copolymer is substantially free (preferably free of) of any ethylenically unsaturated group.
  • composition in reference to an azetidinium-containing copolymer means that the lens- forming composition comprising the azetidinium-containing copolymer and the polymerizable components has an optical transmissibility (between 400 nm to 700 nm) of at least about 85%, more preferably at least about 90%, even more preferably at least about 95%, most preferably at least about 98%.
  • the method further comprises a step of applying a prime coating of an anchoring polymer onto the silicone hydrogel contact lens.
  • the step of heating is performed by autoclaving the silicone hydrogel contact lens immersed in a packaging solution (i.e., a buffered aqueous solution) in a sealed lens package at a temperature of from about 1 18°C to about 125°C for approximately 20-90 minutes.
  • a packaging solution i.e., a buffered aqueous solution
  • the packaging solution comprises from about 0.01 % to about 2%, preferably from about 0.05% to about 1 .5%, more preferably from about 0.1 % to about 1 %, even more preferably from about 0.2% to about 0.5%, by weight of the thermally- crosslinkable hydrophilic polymeric material.
  • All of the various embodiments including preferred embodiments of a silicone hydrogel contact lens, a SiHy lens formulation, an azetidinium-containing vinylic monomer, an anchoring polymer and its uses for forming a prime coating, a water-soluble, thermally- crosslinkable hydrophilic polymeric material, the step of heating the silicone hydrogel contact lens in an aqueous solution in the presence of a water-soluble, thermally-crosslinkable hydrophilic polymeric material, a lens packaging solution and components thereof, lens packages, are described above and can be combined and/or used together in this aspect of the invention.
  • the invention provides a silicone hydrogel contact lens comprising a lens body made of a silicone hydrogel material and a non-silicone hydrogel coating thereon, wherein the non-silicone hydrogel coating is obtained by thermally inducing intermolecular and intramolecular crosslinking of a thermally-crosslinkable hydrophilic polymeric material which comprises azetidinium-containing monomeric units derived from at least one azetidinium-containing vinylic monomer (preferably a monomer of formula (1 ) or (2) described above) and reactive monomeric units derived from a vinylic monomer having an amino or carboxyl group, wherein the silicone hydrogel contact lens has an oxygen permeability of at least about 40 barrers, a surface wettability characterized by a water contact angle of about 100 degrees or less, and a good coating durability characterized by surviving a digital rubbing test.
  • a thermally-crosslinkable hydrophilic polymeric material which comprises azetidinium-containing monomeric units derived from at least one
  • a lens body refers of a preformed silicone hydrogel contact lens to be coated and is obtained from a silicone hydrogel lens formulation
  • composition as described above.
  • the silicone hydrogel contact lens has at least one property selected from the group consisting of: an oxygen permeability of at least about 50 barrers, preferably at least about 60 barrers, more preferably at least about 70 barrers; an elastic modulus of about 1.5 MPa or less, preferably about 1 .2 MPa or less, more preferably about 1 .0 or less, even more preferably from about 0.3 MPa to about 1 .0 MPa; a water content of preferably from about 18% to about 70%, more preferably from about 20% to about 60% by weight when fully hydrated; and combination thereof.
  • the water content of a silicone hydrogel contact lens can be measured according to Bulk Technique as disclosed in US5,849,81 1.
  • the invention provides an ophthalmic product, which comprises a sterilized and sealed lens package, wherein the lens package comprises: a post-autoclave lens packaging solution and a readily-usable silicone hydrogel contact lens immersed therein, wherein the readily-usable silicone hydrogel contact lens comprises a crosslinked hydrophilic coating obtained by autoclaving an original silicone hydrogel contact lens having amino groups and/or carboxyl groups on and/or near the surface of the original silicone hydrogel contact lens in a pre-autoclave packaging solution containing a water- soluble and thermally-crosslinkable hydrophilic polymeric material which comprises from 0.001 % to about 25% by mole of azetidinium-containing monomeric units derived from at least one azetidinium-containing vinylic monomer, wherein the hydrophilic polymeric material is covalently attached onto the silicone hydrogel contact lens through second covalent linkages each formed between one amino or carboxyl group on and/or near the surface of the silicone hydrogel contact lens and one azet
  • All of the various embodiments including preferred embodiments of a silicone hydrogel contact lens, a SiHy lens formulation, an azetidinium-containing vinylic monomer, an anchoring polymer and its uses for forming a prime coating, a water-soluble, thermally- crosslinkable hydrophilic polymeric material, the step of heating the silicone hydrogel contact lens in an aqueous solution in the presence of a water-soluble, thermally-crosslinkable hydrophilic polymeric material, a lens packaging solution and components thereof, lens packages, are described above and can be combined and/or used together in this aspect of the invention.
  • the apparent oxygen permeability (Dk app ), the apparent oxygen transmissibility (Dk /t), the intrinsic (or edge-corrected) oxygen permeability (Dk c ) of a lens and a lens material are determined according to procedures described in Example 1 of U.S. patent application publication No. 2012/0026457 A1 (herein incorporated by reference in its entirety).
  • the lubricity rating is a qualitative ranking scheme where 0 is assigned to control lenses coated with polyacrylic acid (PAA), 1 is assigned to OasysTM/TruEyeTM commercial lenses and 5 is assigned to commercial Air OptixTM lenses.
  • PAA polyacrylic acid
  • the samples are rinsed with excess Dl water for at least three times and then transferred to PBS before the evaluation. Before the evaluation, hands are rinsed with a soap solution, extensively rinsed with Dl water and then dried with KimWipe® towels.
  • the samples are handled between the fingers and a numerical number is assigned for each sample relative to the above standard lenses described above. For example, if lenses are determined to be only slightly better than Air OptixTM lenses, then they are assigned a number 4. For consistency, all ratings are independently collected by the same two operators in order to avoid bias and the data so far reveal very good qualitative agreement and consistency in the evaluation.
  • Water contact angle on a contact lens is a general measure of the surface hydrophilicity (or wetability) of the contact lens. In particular, a low water contact angle corresponds to more hydrophilic surface.
  • Average contact angles (Sessile Drop) of contact lenses are measured using a VCA 2500 XE contact angle measurement device from AST, Inc., located in Boston, Massachusetts. This equipment is capable of measuring advancing or receding contact angles or sessile (static) contact angles. The measurements are performed on fully hydrated contact lenses and immediately after blot-drying as follows. A contact lens is removed from the vial and washed 3 times in ⁇ 200ml of fresh Dl water in order to remove loosely bound packaging additives from the lens surface.
  • the lens is then placed on top of a lint-free clean cloth (Alpha Wipe TX1009), dabbed well to remove surface water, mounted on the contact angle measurement pedestal, blown dry with a blast of dry air and finally the sessile drop contact angle is automatically measured using the software provided by the manufacturer.
  • the Dl water used for measuring the contact angle has a resistivity > 18MQcm and the droplet volume used is 2 ⁇ .
  • uncoated silicone hydrogel lenses (after autoclave) have a sessile drop contact angle around 120 degrees. The tweezers and the pedestal are washed well with Isopropanol and rinsed with Dl water before coming in contact with the contact lenses. Water Break-up Time (WBUT) Tests.
  • the wettabilty of the lenses is also assessed by determining the time required for the water film to start breaking on the lens surface. Briefly, lenses are removed from the vial and washed 3 times in ⁇ 200ml of fresh Dl water in order to remove loosely bound packaging additives from the lens surface. The lens is removed from the solution and held against a bright light source. The time that is needed for the water film to break (de-wet) exposing the underlying lens material is noted visually. Uncoated lenses typically instantly break upon removal from Dl water and are assigned a WBUT of 0 seconds. Lenses exhibiting WBUT ⁇ 5 seconds are considered wettable and are expected to exhibit adequate wettability (ability to support the tear film) on-eye.
  • the intactness of a coating on the surface of a contact lens can be tested according to Sudan Black stain test as follow.
  • Contact lenses with a coating an LbL coating, a plasma coating, or any other coatings
  • a Sudan Black dye solution Sud Black in vitamin E oil.
  • Sudan Black dye is hydrophobic and has a great tendency to be adsorbed by a hydrophobic material or onto a hydrophobic lens surface or hydrophobic spots on a partially coated surface of a hydrophobic lens (e.g., silicone hydrogel contact lens). If the coating on a hydrophobic lens is intact, no staining spots should be observed on or in the lens. All of the lenses under test are fully hydrated.
  • the lenses are digitally rubbed (wearing disposable powder- free latex gloves) with Solo-care® multi-purpose lens care solution for 30 times and then rinsed with saline. The above procedure is repeated for a given times, e.g., from 1 to 30 times, (i.e., number of consecutive digital rubbing tests which imitate cleaning and soaking cycles).
  • the lenses are then subjected to Sudan Black test (i.e., coating intactness test described above) to examine whether the coating is still intact.
  • Sudan Black test i.e., coating intactness test described above
  • staining spots e.g., staining spots covering no more than about 5% of the total lens surface. Water contact angles are measured to determine the coating durability.
  • Low pH CLAN tests for the coating coverage on lens surfaces using a hydrophobic (Nile red, also known as Nile Blue Oxazone) dye. Any exposed hydrophobic areas on the lens will bind hydrophobic dye. If a homogeneous coating on the lens is intact, no staining spots should be observed on or in the lens.
  • the test is done by dipping a contact lens into 1 N HCI(aq) for about 30 seconds, followed by a 2 second dip in a Nile red solution (1 -propanol/ n-Heptane), and finally a 30 second dip in Dl water to rinse off the excess dye.
  • the lens is then placed in the CLAN (digital camera at a fixed focus through a magnifying optics and filter) where the lens is then illuminated with the blue fluorescence excitation light.
  • the image is captured and analyzed by image processing software for the hydrophobic fluorescence dye adsorbed by the hydrophobic surfaces.
  • the lens is considered a failure if the sum of half the number of light pixels and half the number of dark pixels is greater than 5000.
  • Bead Testing is used to determine the negative charge on the contact lens surface. A bead testing value of 50 or less is acceptable for the charge on the lens surface. Higher values also reflect if the packaged coating is not able to cover a PAA PMAA coated lens which generally has bead numbers >200.
  • 0.2g of Dovex 1x4 chloride form 50-100 mesh (CAS 6901 1-19-4) is measured in a centrifuge cup followed by addition of 4ml PBS (phosphate buffered saline).
  • PBS phosphate buffered saline
  • a lens is placed on the back side of the tube and the tube is shaken for 1 min at 300 rpm. After this, the tube is rinsed and replaced with 5ml of PBS followed by shaking for 1 min at 300rpm to get rid of any superficial beads. The lens is than analyzed under a microscope and beads are counted.
  • TBO Assay Prepare a stock solution of sodium phosphate dibasic (0.2% wt/wt, pH 2). Prepare a stock solution of sodium bicarbonate (0.2% wt/wt, pH 10). Prepare a stock solution of Toluidine Blue O (abbreviated TBO, 2000 ppm) in water. Set two digital block heaters to 35 and 50°C. Prepare freshly diluted 0.1 %(wt/wt) solutions of both the pH 2 and pH 10 buffers. Prepare 50 ppm TBO solution from the TBO stock solution (2000 ppm). Rinse each lens to be tested in 100 ml. of Dl water for about 5 minutes. Blot each lens to remove excess water using Alpha wipe synthetic wipers.
  • TBO Toluidine Blue O
  • PHMB Method Prepare 1 liter of phosphate buffered saline (PBS) by dissolving 7.85 g NaCI, 0.773 g monobasic sodium phosphate, and 4.759 g dibasic sodium phosphate in purified water. Adjust pH to 7.1 to 7.3 as needed.
  • PBS phosphate buffered saline
  • ATS solution by combining 4.500 grams NaCI, 0.074 g calcium chloride dihydrate, 0.550 g citric acid monohydrate, 1 .400 g sodium citrate, and 493.475 g purified water. Adjust to pH 7.0.
  • the stir speed is set to 150 rpm.
  • the reaction kettle is put into a Rayonet UV reactor with RPR- 3500 UV bulbs. Four UV bulbs are turned on for about 1 hour at an intensity of about 2.0 mW/cm 2 . After about one hour, the solution is vacuum filtered through qualitative filter paper. The copolymer solution is then purified using 50kDa dialysis membranes against water for 24 hours using a water flow rate of about 40 mL/min. The solids content is determined and diluted to 2% if necessary.
  • the nitrogen flow rate is reduced to about 150 mL/min.
  • the stir speed is set to 150 rpm.
  • the reaction kettle is put into a Rayonet UV reactor with RPR-3500 UV bulbs. Four UV bulbs are turned on for 1 hour at an intensity of about 2.0 mW/cm 2 . After 1 hour, the solution is vacuum filtered through qualitative filter paper. The copolymer solution is then purified using 50kDa dialysis membranes against water for 24 hours using a flow rate of about 40 mL/min. The solids content is determined and diluted to 2% if necessary. 3c. Preparation of AZM/APMA/PEG/AGA containing copolymer for IPC.
  • the nitrogen flow rate is reduced to about 150 mL/min.
  • the stir speed is set to 150 rpm.
  • the reaction kettle is put into a Rayonet UV reactor with RPR-3500 UV bulbs. Four UV bulbs are turned on for 1 hour at an intensity of about 2.0 mW/cm 2 . After about one hour, the solution is vacuum filtered through qualitative filter paper. The copolymer solution is then purified using 50kDa dialysis membranes against water for 24 hours . The solids content is determined and diluted to 2% if necessary.
  • the solution is sparged with nitrogen for 20 minutes at about 200 mL/min.
  • the nitrogen flow rate is reduced to about 150 mL/min.
  • the stir speed is set to 150 rpm.
  • the reaction kettle is put into a Rayonet UV reactor with RPR-3500 UV bulbs. Four UV bulbs are turned on for about one hour at an intensity of about 2.0 mW/cm 2 . After about one hour, the solution is vacuum filtered through qualitative filter paper.
  • the copolymer solution is then purified using 50kDa dialysis membranes against water for 24 hours using a flow rate of about 40 mL/min. The solids content is determined and diluted to 2% if necessary.
  • the stir speed is set to 150 rpm.
  • the reaction kettle is put into a Rayonet UV reactor with RPR-3500 UV bulbs. Two UV bulbs are turned on for about one hour at an intensity of about 2.0 mW/cm 2 .
  • the copolymer solution is then purified using 25kDa dialysis membranes against 1 -PrOH for about 35 hours including two changes of 1-PrOH (1 - propanol) during that time. The solids content is determined and diluted to 10% if necessary.
  • the nitrogen flow rate is reduced to about 150 mL/min.
  • the stir speed is set to 150 rpm.
  • the reaction kettle is put into a Rayonet UV reactor with RPR-3500 UV bulbs. Two UV bulbs are turned on for 45 minutes.
  • the copolymer solution is then purified using 25kDa dialysis membranes against 1-PrOH for about 35 hours. The solids content is determined and diluted to 10% if necessary.
  • the buffer concentrate is prepared by dissolving 0.484% by weight of sodium citrate dihydrate, 0.708% by weight of sodium phosphate dibasic, 0.088% by weight of sodium phosphate monobasic, monohydrate, and 1.486% by weight of sodium chloride in Dl water. The pH is adjusted to about 7.2, if necessary.
  • IPC-5A to IPC-5D In-package coating solutions (IPC-5A to IPC-5D) are prepared from 2% AZM-containing copolymer solutions (3a-3d of Example 3) and the buffer concentrate prepared above and have the compositions shown in the table below.
  • the pH of IPC-5A to IPC-5D is adjusted, if necessary, to pH 7.2 to 7.4.
  • IPC-5E Preparation of IPC-5E.
  • Poly(AAm-co-AA)(90/10) partial sodium salt ( -90% solid content, poly(AAm-co-AA) 90/10, Mw 200,000) is purchased from Polysciences, Inc. and used as received.
  • Polyamidonamine epichlorohydrin (PAE) (Kymene, an azetidinium content of 0.46 assayed with NMR) is purchased from Ashland as an aqueous solution and used as received.
  • IPC-5E is prepared by dissolving about 0.07% w/w of poly(AAm-co-AA)(90/10) and about 0.15% of PAE (an initial azetidinium millimolar equivalents of about 8.8 millimole) in phosphate-buffered saline (PBS) (about 0.044 w/w% NaH 2 P0 4 -H 2 0, about 0.388 w/w/% Na 2 HP0 4 -2H 2 0, about 0.79 w/w% NaCI) and adjusting the pH to 7.2-7.4. Then the IPC-5E is heat pre-treated for about 6 hours at about 60°C (heat pretreatment).
  • PBS phosphate-buffered saline
  • poly(AAm-co-AA) and PAE are partially crosslinked to each other (i.e., not consuming all azetidinium groups of PAE) to form a water-soluble and thermally- crosslinkable hydrophilic polymeric material containing azetidinium groups within the branched polymer network in the IPC-5E.
  • the IPC-5E is cooled to room temperature then filtered using a 0.22micron PES membrane filter.
  • Silicone hydrogel contact lenses with a PAA coating thereon are prepared according to the procedures (the lens formulation, molds, cast-molding conditions, lens extraction, PAA coating solution, PAA coating procedures, etc.) described in Example 19 of U.S. patent application publication No. 2012/0026458 A1 (herein incorporated by reference in its entirety).
  • PAA-coating solution A polyacrylic acid (PAA) coating solution is prepared by dissolving an amount of PAA (M.W.: 450kDa, from Lubrizol) in a given volume of 1 -propanol (1 -PrOH) to have a concentration of about 0.44% by weight and the pH is adjusted with formic acid to about 2.0.
  • PAA polyacrylic acid
  • Contact lenses with a PAA coating thereon are packaged in polypropylene lens packaging shells/ blisters (one lens per shell) each containing 0.55 ml. of one of the following packaging salines: phosphate-buffered saline (PBS) and IPC-5A to IPC-5D (prepared in Example 5).
  • PBS phosphate-buffered saline
  • IPC-5A to IPC-5D prepared in Example 5
  • the blisters are then sealed with foil and autoclaved for about 30 minutes at 121 °C.
  • Crosslinked coatings are formed during the autoclave on those lenses immersed in a packaging saline containing an azetidinium-containing copolymer or polymeric material. Resultant lenses after autoclave are characterized and the results are reported in the table below.
  • Silicone hydrogel contact lenses are prepared by cast-molding according the procedures (the lens formulation, molds, cast-molding conditions, etc.) described in Example 19 of U.S. patent application publication No. 2012/0026458 A1 (herein incorporated by reference in its entirety).
  • PMAA-coating solutions A polymethacrylic acid (PMAA) solution is prepared by dissolving PMAA (Mn -418K) and formic acid in a given volume of a water/1 -propanol mixture, and then diluted with water and 1 -propanol to forming PMAA coating solutions having the following compositions:
  • PMAA PMAA (0.44% w/w); 1-propanol (86.63% w/w); water (9.63% w/w); and formic acid (3.74% w/w).
  • PMAA-coated lenses Cast-molded contact lenses obtained as above are extracted and coated by dipping in the following series of baths: Dl water bath for about 56 seconds; 3 methyl ethyl ketone (MEK) baths for about 22, 78, 226 second respectively; one Dl water bath for about 56 seconds; one bath of PMAA coating solution (prepared above) for about 100 seconds; one bath of a water/1 -propanol 50%/50% mixture for about 56 seconds; one bath of water for about 56 seconds; one bath of phosphate buffered saline for about 56 seconds; and one Dl water bath for about 56 seconds.
  • Dl water bath for about 56 seconds 3 methyl ethyl ketone (MEK) baths for about 22, 78, 226 second respectively
  • MEK methyl ethyl ketone
  • PMAA coating solution prepared above
  • This example illustrates preparation of an amphiphilic copolymer (ACP) that uses AZM (as prepared in Example 2) and acrylic acid to provide a cross-linkable primary coating designed to react with the IPC copolymer.
  • ACP amphiphilic copolymer
  • AZM is the electrophile and acrylic acid is the nucleophile in the copolymer. Both can react with a crosslinkable copolymer added to a saline solution to apply a in-package cross- linked coating on a silicone hydrogel contact lens.
  • the copolymer also incorporates polydimethylsiloxane segment (PDMS) to provide a hydrophobic interaction to attach the copolymer to the surface of a hydrophobic lens (e.g., a silicone hydrogel contact lens).
  • PDMS polydimethylsiloxane segment
  • DMA is used to provide hydrophilicity and high molecular weight copolymers.
  • the copolymer has much less acrylic acid content (concentration) compared to polyacrylic acid (PAA) or polymethacrylic acid (PMAA) homopolymers.
  • the preferred range of weight percentages of monomers used in a reaction mixture for preparing a copolymer of the invention is listed in table 1 below.
  • the copolymer is prepared according to the procedure similar to that described in Example 4 for preparing Copolymer 4a.
  • Silicone hydrogel contact lenses are prepared by cast-molding according the procedures (the lens formulation, molds, cast-molding conditions, etc.) described in Example 19 of U.S. patent application publication No. 2012/0026458 A1 (herein incorporated by reference in its entirety).
  • Amphiphilic copolymer solutions (herein after ACP coating solutions I to IV) each are prepared by dissolving one of ACP copolymers 4a to 4e (about 10% solution) prepared in Example 4 in a mixture of 1 -propanol (85%) and water (15%).
  • the ACP concentration is about 1 % by weight.
  • ACP-coated lenses Cast-molded contact lenses as above are extracted and coated with ACP by dipping in the following series of baths: one Dl water bath for about 56 seconds; 3 MEK baths for about 22, 78, and 224 second respectively; one Dl water bath for about 56 seconds; one bath of ACP coating solution (about 1 % by weight) in a mixture of 1- propanol/water (85%/15%) for about 180 seconds; one bath of a water/1 -propanol
  • ACP-I coated lenses are obtained using ACP coating solution I (containing ACP copolymer 4a); ACP-II coated lenses are obtained using ACP coating solution II (containing ACP copolymer 4b); ACP-III coated lenses are obtained using ACP coating solution II (containing ACP copolymer 4c); ACP-IV coated lenses are obtained using ACP coating solution IV (containing ACP copolymer 4d). Control A lenses are obtained according to the procedures above, except that bath 6 is free of ACP and contains only the solvent mixture.
  • ACP-coated contact lenses prepared above are packaged in polypropylene lens packaging shells/ blisters (one lens per shell) each containing 0.55 mL of one of the following packaging salines: PBS (as control) and IPC-5E (prepared in Example 5).
  • Control A lenses are packaged in polypropylene lens packaging shells/ blisters (one lens per shell) each containing 0.55 mL of PBS.
  • Control B lenses are ACP-coated lenses which are packaged in polypropylene lens packaging shells/ blisters (one lens per shell) each containing 0.55 mL of PBS.
  • the blisters are then sealed with foil and autoclaved for 30 minutes at about 121 °C.
  • Crosslinked coatings are formed during the autoclave on those lenses immersed in a packaging saline containing an azetidinium- containing copolymer or polymeric material.
  • Silicone hydrogel contact lenses with a PAA coating thereon are prepared according to the procedures (the lens formulation, molds, cast-molding conditions, lens extraction, PAA coating solution, PAA coating procedures, etc.) described in Example 19 of U.S. patent application publication No. 2012/0026458 A1 (herein incorporated by reference in its entirety).
  • AZM/APMA/DMA containing copolymer Preparation of AZM/APMA/DMA containing copolymer.
  • APMA aminopropylmethacrylamide
  • DMA ⁇ , ⁇ '-dimethylacrylamide
  • Irgacure 2959 solution 1 % in water
  • a lid is put onto the reaction kettle that contains at least 4 ground glass joints.
  • the nitrogen flow rate is reduced to about 150 mL/min.
  • the stir speed is set to 150 rpm.
  • the reaction kettle is put into a Rayonet UV reactor with RPR-3500 UV bulbs. Four UV bulbs are turned on for about 1 hour at an intensity of about 2.0 mW/cm 2 . After about one hour, the solution is vacuum filtered through qualitative filter paper. The copolymer solution is then purified using 50kDa dialysis membranes against water for 24 hours using a water flow rate of about 40 mL/min. The solids content is determined and diluted to 2% if necessary.
  • IPC 9A is prepared by making a 0.5% w/w solution of the AZM/APMA/DMA copolymer prepared above. A 2% copolymer solution is diluted by the PBS concentrate in Example 5 (50% w/w) and water (25% w/w) to get the final concentration of 0.5 w/w% Poly(AAm-co-AA)(90/10) partial sodium salt ( -90% solid content, poly(AAm-co-AA) 90/10, Mw 200,000) is purchased from Polysciences, Inc. and used as received.
  • IPC 9B is prepared by dissolving about 0.1 % w/w of poly(AAm- co-AA)(90/10) and about 0.5% w/w of the AZM/APMA/DMA copolymer.
  • IPC 9C is prepared by dissolving about 0.3% w/w of poly(AAm-co-AA)(90/10) and about 0.5% w/w of the
  • Both IPC 9B and 9C are adjusted to pH 7.2 - 7.4 by adding about 0.044 w/w% NahfePCVhfeO, about 0.388 w/w/% Na 2 HP0 4 -2H 2 0 and about 0.79 w w% NaCI. After that, IPC 9B and 9C are pre-heated for 10 hours at 70°C.
  • poly(AAm-co-AA) and AZM copolymer are partially reacted to each other (i.e., not consuming all azetidinium groups of the copolymer) to form a water-soluble and thermally-crosslinkable hydrophilic polymeric material containing azetidinium groups within the branched polymer network in the IPC 9B and 9C.
  • the IPC is filtered using a 0.22micron PES membrane filter.
  • PAA coated lenses are packaged in
  • polypropylene shells (one lens per shell) containing 0.65ml of either IPC 9A, 9B or 9C.
  • Blisters are sealed and autoclaved for 45min at 121 °C.
  • Silicone hydrogel contact lenses with a PAA coating thereon are prepared according to the procedures (the lens formulation, molds, cast-molding conditions, lens extraction, PAA coating solution, PAA coating procedures, etc.) described in Example 19 of U.S. patent application publication No. 2012/0026458 A1 (herein incorporated by reference in its entirety).
  • the nitrogen flow rate is reduced to about 150 mL/min.
  • the stir speed is set to 150 rpm.
  • the reaction kettle is put into a Rayonet UV reactor with RPR-3500 UV bulbs. Two UV bulbs are turned on for about 1 hour at an intensity of about 2.0 mW/cm 2 . After about one hour, the solution is vacuum filtered through qualitative filter paper. The copolymer solution is then purified by ultrafiltration using a 10kDa membranes until the solution conductivity reaches less than 10uS/cm. The solids content is determined and diluted to 0.8% if necessary.
  • Various copolymers are prepared with the ratios given in the table below.
  • Silicone hydrogel contact lenses are prepared by cast-molding according the procedures (the lens formulation, molds, cast-molding conditions, etc.) described in Example 19 of U.S. patent application publication No. 2012/0026458 A1 (herein incorporated by reference in its entirety).
  • PMAA copolymer coating solution Polymethacrylic acid (PMAA) copolymer coating solutions are prepared from PMAA copolymers prepared in Example 10 to have the following composition: PMAA copolymer (0.01 1 % w/w) which is one of PMAA 10A to 10E prepared in Example 10; 1 -propanol (86.63% w/w); water (9.63% w/w); and formic acid (3.74% w/w).
  • PMAA copolymer coated lenses Cast-molded contact lenses obtained as above are extracted and coated by dipping in the following series of baths: Dl water bath for about 56 seconds; 3 methyl ethyl ketone (MEK) baths for about 22, 78, 226 second respectively; one Dl water bath for about 56 seconds; one bath of PMAA copolymer coating solution (prepared above) for about 100 seconds; one bath of a water/1 -propanol 50%/50% mixture for about 56 seconds; one bath of water for about 56 seconds; one bath of phosphate buffered saline for about 56 seconds; and one Dl water bath for about 56 seconds.
  • the lenses are immediately tested for acid group content by TBO Assay as described in Example 1 . The data are shown below.
  • PHMB polyhexamethylene biguanide

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CA2870333A CA2870333C (en) 2012-06-14 2013-06-10 Azetidinium-containing copolymers and uses thereof
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RU2014151562A RU2647728C2 (ru) 2012-06-14 2013-06-10 Азетидинийсодержащие сополимеры и их применения
EP13731005.8A EP2861413B1 (en) 2012-06-14 2013-06-10 Azetidinium-containing copolymers and uses thereof
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