Soft hydrophobic acrylic materials
Soft hydrophobic acrylic materials with improved resistance to fluid diffusion and suitable mechanical properties that allow deformation upon application of force are disclosed. The acrylic materials are particularly suitable for use in fluid-based accommodating intraocular lenses and comprises combination of a perfluoro-substituted alkyl (meth)acrylate and an alkyl (meth)acrylate, and a cross-linking agent.
1. A soft hydrophobic acrylic material,
being characterized by having a storage modulus of from about 0.5 MPa to about 3.0 MPa measured by dynamic mechanical analysis under compression mode at about 35° C. and a silicone uptake of less than about 2.0% by weight after accelerated aging in a silicone fluid for 32 days at 70° C.,
wherein the acrylic material is obtained from a polymerizable composition comprising:
a) from about 65% to about 80% by weight of at least one perfluoro-substitued-C 2 -C 12 alkyl (meth)acrylate which is selected from the group consisting of 2,2,2-trifluoroethyl methacrylate, 2,2,2-trifluoroethyl acrylate, tetrafluoropropyl methacrylate, tetrafluoropropyl acrylate, hexafluoroisopropyl methacrylate, hexafluoroisopropyl acrylate, hexafluorobutyl methacrylate, hexafluorobutyl acrylate, heptafluorobutyl methacrylate, heptafluorobutyl acrylate, octafluoropentyl methacrylate, octafluoropentyl acrylate, dodecafluoroheptyl methacrylate, heptadecafluorodecyl acrylate, heptadecafluorodecyl methacrylate, and combinations thereof;
b) from about 20% to about 35% by weight of at least one C 2 -C 12 alkyl (meth)acrylate which is selected from the group consisting of ethyl acrylate, ethyl methacrylate, n-propyl acrylate, n-propyl methacrylate, n-butyl acrylate, n-butyl methacrylate, n-pentyl acrylate, n-pentyl methacrylate, n-hexyl acrylate, n-hexyl methacrylate, n-heptyl acrylate, n-heptyl methacryate, n-octyl acrylate, n-octyl methacrylate, n-nonyl acrylate, n-nonyl methacrylate, n-decyl acrylate, n-decyl methacrylate, n-undecyl acrylate, n-undecyl methacrylate, lauryl acrylate, lauryl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, 2,2-dimethylpropyl acrylate, 2,2-dimethylpropyl methacrylate, isobutyl acrylate, isobutyl methacrylate, isopentyl acrylate, isopentyl methacrylate, and mixtures thereof; and
c) at least one cross-linking agent which is selected from the group consisting of ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, allyl methacrylate, 1,3-propanediol dimethacrylate, 2,3-propanediol dimethacrylate, 1,6-hexanediol dimethacrylate, 1,4-butanediol dimethacrylate, their corresponding acrylates, and combinations thereof, provided that the polymerizable composition is substantially free of any aryl acrylic monomer.
2. The acrylic material of claim 1 , wherein the acrylic material is characterized by having a storage modulus of from about 0.75 MPa to about 2.5 MPa measured by dynamic mechanical analysis under compression mode at about 35° C. and a silicone uptake of less than about 1.5% by weight after accelerated aging in a silicone fluid for 32 days at 70° C.
3. The acrylic material of claim 1 , wherein the acrylic material is characterized by having a storage modulus of from about 1.0 MPa to about 2.0 MPa measured by dynamic mechanical analysis under compression mode at about 35° C. and a silicone uptake of less than about 1.0% by weight or less after accelerated aging in a silicone fluid for 32 days at 70° C.
4. The acrylic material of claim 1 , wherein said at least one C 2 -C 12 alkyl (meth)acrylate is selected from the group consisting of n-butyl acrylate, n-butyl methacrylate, and mixtures thereof.
5. The acrylic material of claim 4 , wherein said at least one cross-linking agent is selected from the group consisting of: ethylene glycol dimethacrylate; diethylene glycol dimethacrylate; triethylene glycol dimethacrylate, 1,4-butanediol dimethacrylate; their corresponding acrylates; and combinations thereof.
6. The acrylic material of claim 1 , wherein polymerizable composition comprises heptadecafluorodecyl methacrylate, butyl acrylate, and ethylene glycol dimethacrylate.
7. The acrylic material of claim 2 , wherein said at least one C 2 -C 12 alkyl (meth)acrylate is selected from the group consisting of n-butyl acrylate, n-butyl methacrylate, and mixtures thereof.
8. The acrylic material of claim 7 , wherein said at least one cross-linking agent is selected from the group consisting of: ethylene glycol dimethacrylate; diethylene glycol dimethacrylate; triethylene glycol dimethacrylate, 1,4-butanediol dimethacrylate; their corresponding acrylates; and combinations thereof.
9. The acrylic material of claim 2 , wherein polymerizable composition comprises heptadecafluorodecyl methacrylate, butyl acrylate, and ethylene glycol dimethacrylate.