Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
  • A61F2/16—Intraocular lenses
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
  • A61L27/50—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
• • 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
  • C08F4/00—Polymerisation catalysts
  • C08F4/04—Azo-compounds
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/16—Nitrogen-containing compounds
  • C08K5/34—Heterocyclic compounds having nitrogen in the ring
  • C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
  • C08K5/3472—Five-membered rings
  • C08K5/3475—Five-membered rings condensed with carbocyclic rings
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
  • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
  • G02B1/041—Lenses
  • G02B1/043—Contact lenses

Definitions

• This invention is directed to ophthalmic lens materials.
• this invention relates to ultraviolet light absorbers that also act as polymerization initiators for ophthalmic lens materials.
• UV absorbers Numerous copolymerizable benzatriazole, benzophenone and triazine UV absorbers are known. Many of these UV absorbers contain conventional olefinic polymerizable groups, such as methacrylate, acrylate, methacrylamide, acrylamide or styrene groups. Copolymerization with other ingredients in the lens materials, typically with a radical initiator, incorporates the UV absorbers into the resulting polymer chain. Incorporation of additional functional groups, on a UV absorber may influence one or more of the UV absorber's UV absorbing properties, solubility or reactivity.
• the UV absorber may coalesce into domains that could interact with light and result in decreased optical clarity of the lens.
• Examples of polymeric ophthalmic lens materials that incorporate UV absorbers can be found in U.S. Patent Nos. 5,290,892; 5,331 ,073 and 5,693,095.
• the present invention provides dual function UV absorbers. These UV absorbers contain a labile functional group capable of initiating radical polymerization. These UV absorbers are suitable for use in ophthalmic lenses, including contact lenses, and are particularly useful in implantable lenses, such as intraocular lenses (lOLs).
• lOLs intraocular lenses
• 3-(2H-benzotriazol-2- yl)-4-hydroxyphenethyl alcohol (1) may be coupled to 4,4'-azobis(4- cyanopentanoic acid) (2) using a carbodiimide esterification agent.
• the product (3) can then initiate radical polymerization of a vinyl monomer (e.g., acrylate, methacrylate, acrylamide, methacrylamide, styrene) by application of heat and/or UV/visible light and the UV absorbing functionality will be covalently attached to the polymer chain.
• a vinyl monomer e.g., acrylate, methacrylate, acrylamide, methacrylamide, styrene
• This invention provides the synthesis of a single component additive that provides a dual function: UV absorption properties and ability to initiate free radical polymerization.
• the result is a covalently linked UV absorber that will not leach out of the product or phase separate and lead to decreased optical clarity.
• the synthesis permits flexibility in tailoring both UV absorbing strength and initiator half-life. UV-initiation of polymerization of the lens material is still possible with protection of the hydroxy group on the UV absorbing function of the DFUVAS.
• the DFUVAS can be synthesized from azo, organic peroxide, phosphine oxide, and ⁇ -hydroxyketone radical polymerization initiators that contain appropriate functional groups.
• the necessary functionality from each of these initiator classes is the presence of a functional group (carboxylic acid or hydroxyl) through which a UV absorbing benzotriazole, benzophenone or triazine can be covalently linked.
• Preferred DFUVAS are those represented by formulas [1] - [7].
• V-501 (4,4'-azobis(4-cyanopentanoic acid)) from Wako Chemicals.
• VA-086 contains two terminal hydroxyl groups.
• VA-080 contains three hydroxyl groups on each side of the thermally labile azo linkage.
• an azo functional UV absorber can be synthesized from an azo initiator with the following structural characteristics:
• A is -CH 3 or -CH 2 CH 3 .
• B is -CN, -C0 2 H, -COH, -COCH 3 , -C0 2 CH 3) -S0 3 H, -CF 3 , or -N0 2 when D is
• E is O or NH, NCH 3 , or NCH 2 CH 3
• R a benzotriazole or benzophenone UV absorber
• R' -CH 3 or -CH 2 CH 3 .
• Many benzotriazole and benzophenone UV absorbers are known and many are commercially available from a variety of sources, such as Ciba Specialty Chemicals. The identity of the benzotriazole or benzophenone UV absorber is not critical, but should be selected based on its characteristic UV cut-off to give the desired UV absorbing property.
• preferred benzotriazole UV absorbers are hydroxyphenylbenzotriazoles and preferred benzophenone UV absorbers are hydroxyphenylbenzophenones that have been modified to contain a functional group that can be covalently bonded to a radical polymerization initiator.
• a preferred hydroxyphenylbenzotriazole UV absorber is 2-N-(2- hydroxyphenyl)benzotriazole, where the UV absorbing group is linked through an ethyl ether linkage at the para position on the hydroxyphenyl group, as shown below linked to an azo functionality.
• UV polymerization initiators are commercially available.
• 2-hydroxy-1-[4-(2-hydroxy- ethoxy)phenyl]-2-methylpropan-1-one (Irgacure® 2959, Ciba Specialty Chemicals) contains a free primary hydroxyl group covalently attached to a UV light labile ⁇ -hydroxyketone linkage.
• This primary hydroxyl can be used as a covalent linking point.
• Irgacure® 2959 the primary hydroxyl was used to covalently attach hydrophilic functional groups through an ether linkage to create a water-soluble photoinitiator (Gruber, H. F.; Knaus, S. J. Polym. Sci. Part A: Polym. Chem. 1995, 33, 929).
• Irgacure® 2959 A generic ⁇ -hydroxyketone photoinitiator that contains the appropriate functional groups for covalently linking a UV chromophore is represented by formula [2]:
• J is CH 3 or CH 2 CH 3 .
• Functionalized phosphine oxide photoinitiators are also known.
• a vinyl functional phosphine oxide was used in the synthesis of polymeric acylphosphine oxide photoinitiators (DeGroot, J. H.; Dillingham, K.
• a generic phosphine oxide photoinitiator that contains the appropriate functional groups for covalently linking a UV chromophore is represented by formula [3].
• Q is -H, -CH 3> -CH 2 CH 3 , -CH(CH 3 )CH 3) or -C(CH 3 ) 3 .
• acylperoxide initiator that contains appropriate functional groups for covalently linking a UV chromophore is represented by formula [4].
• Y nothing or O;
• R a benzotriazole or benzophenone UV absorber;
• R' a benzotriazole or benzophenone UV absorber;
• -(CH 2 ) n H (n 1-18); - CH(CH 3 )CH 3 ; -C(CH 3 ) 3 ; -C 6 H 5 ; -CH(CH 3 )CH 2 CH 3 ; -C(CH 3 ) 2 CH 2 C(CH3) 3 ; - C(CH 3 ) 2 (CH 2 ) 4 H; -C(CH 2 CH 3 ) 2 (CH 2 ) 4 H; -C(CH 3 ) 2 (CH 2 ) 5 H;
• R a benzotriazole or benzophenone UV absorber
• R' a benzotriazole or benzophenone UV absorber
• -(CH 2 ) n H (n 1-18); - CH(CH 3 )CH 3 ; -C(CH 3 ) 3 ; -C 6 H 5 ; -CH(CH 3 )CH 2 CH 3 ; -C(CH 3 )2CH 2 C(CH 3 ) 3 ; - C(CH 3 ) 2 (CH 2 ) 4 H; -C(CH 2 CH 3 ) 2 (CH 2 ) 4 H; -C(CH 3 ) 2 (CH 2 ) 5 H;
• R a benzotriazole or benzophenone UV absorber
• R' H, a benzotriazole or benzophenone UV absorber
• -(CH 2 ) n H (n 1-18); - CH(CH 3 )CH 3 ; -C(CH 3 ) 3 ; -CH(CH 3 )CH 2 CH 3 ; -C(CH 3 )2CH 2 C(CH3)3; - C(CH 3 )2(CH 2 )4H; -C(CH 2 CH 3 ) 2 (CH 2 )4H; -C(CH 3 ) 2 (CH 2 ) 5 H;
• R a benzotriazole or benzophenone UV absorber
• the amount of DFUVAS contained in ophthalmic lens materials will depend upon the desired UV blocking characteristics but will typically range from 1 - 5 wt%.
• Example 1 Esterification of 4,4'-azobis(4-cyanopentanoic acid) with 3-(2H- benzotriazol-2-yl)-4-hydroxyphenethyl alcohol
• Example 2 Preparation of Ophthalmic Lens Material initiated with UV absorbing inititator prepared in Example 1.
• a scintillation vial was charged with 3.3572 g (19.052 mmol) of 2-phenylethyl acrylate (PEA), 1.5585 g (8.192 mmol) of 2-phenylethyl methacrylate (PEMA), and 0.0611 g (0.308 mmol) of 1 ,4-butanediol diacrylate (BDDA).
• PPA 2-phenylethyl acrylate
• PEMA 2-phenylethyl methacrylate
• BDDA 1-butanediol diacrylate
• the initiated formulation was filtered through a 0.2 micron PTFE filter and dispensed into polypropylene molds.
• the molds were placed in an oven for 1 hr at 70 °C then 2 hrs at 110 °C.
• the product polymer was extracted in acetone at room temperature for 16 hrs.
• the polymer was allowed to air dry for 1.5 hr, then placed in a 60 °C vacuum oven for 3 hrs.
• the weight loss following extraction was determined gravimetrically and the UV ⁇ is spectrum was recorded from 190 to 820 nm on a 1 mm thick flat. The data is listed in
• Example 3 Preparation of Ophthalmic Lens Material initiated with UV absorbing initiator prepared in Example 1.
• a scintillation vial was charged with 3.3502 g (19.012 mmol) of 2-phenylethyl acrylate (PEA), 1.5516 g (8.156 mmol) of 2-phenylethyl methacrylate (PEMA), and 0.0567 g (0.286 mmol) of 1 ,4-butanediol diacrylate (BDDA).
• the monomer mixture was purged with N 2 and 0.0761 g (0.101 mmol) of the UV absorbing initiator prepared in Example 1 was added and allowed to dissolve.
• a scintillation vial was charged with 3.3580 g (19.057 mmol) of 2-phenylethyl acrylate (PEA), 1.5629 g (8.215 mmol) of 2-phenylethyl methacrylate (PEMA), and 0.0589 g (0.297 mmol) of 1 ,4-butanediol diacrylate (BDDA).
• the monomer mixture was purged with N 2 and 0.0502 g (0.306 mmol) of 2,2'- azobisisobutyronitrile (AIBN) was added and allowed to dissolve.
• the initiated formulation was filtered through a 0.2 micron PTFE filter and dispensed into polypropylene molds.
• the molds were placed in an oven for 1 hr at 70 °C then 2 hrs at 110 °C.
• the product polymer was extracted in acetone at room temperature for 16 hrs.
• the polymer was allowed to air dry for 1.5 hr, then placed in a 60 °C vacuum oven for 3 hrs.
• the weight loss following extraction was determined gravimetrically and the UV ⁇ /is spectrum was recorded from 190 to 820 nm on 1 mm thick flat. The data is listed in Table 1.
• Table 1 Weight % acetone extractables and UV cut-off of ophthalmic lens materials.

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• 2003
  • 2003-12-15 CA CA002512586A patent/CA2512586A1/en not_active Abandoned
  • 2003-12-15 AU AU2003297108A patent/AU2003297108B2/en not_active Ceased
  • 2003-12-15 PT PT03815211T patent/PT1581272E/pt unknown
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