High refractive index, optically clear and soft hydrophobic acrylamide copolymers
AssigneeStaar Surgical Company, Inc.
InventorXiugao Liao
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Abstract
High refractive index, optically clear and soft hydrophobic acrylamide copolymers and ophthalmic lenses made therefrom are provided. The copolymers are comprised of a hydrophobic acrylamide monomer of N-Benzyl-N-isopropylacrylamide and at least one monomer of an alkyl acrylate and/or alkyl methacrylate. The copolymers and ophthalmic lenses of the present invention are hydrophobic and soft, with a low glass transition temperature (Tg) and a high refractive index.
Claims37
An ophthalmic lens formed from a hydrophobic acrylamide copolymer comprising:
- a first constituent that is a hydrophobic acrylamide monomer.
An ophthalmic lens formed from a hydrophobic acrylamide copolymer comprising:
- a first constituent that is a hydrophobic acrylamide monomer, the hydrophobic acrylamide monomer being N-benzyl-N-isopropylacrylamide;
- a second constituent selected from the group consisting of alkyl acrylate monomers, alkyl methacrylate monomers and mixtures thereof;
- a crosslinking agent selected from the group consisting of ethylene glycol diacrylate, ethylene glycol dimethacrylate, 1,3-butanediol diacrylate, 1,3-butanediol dimethacrylate, 1,4-butanediol diacrylate, 1,4-butanediol dimethacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, poly(ethylene glycol) diacrylate and poly(ethylene glycol) dimethacrylate;
- a UV absorbing constituent selected from the group consisting of acrylate or methacrylate functionalized benzotriazoles and benzophenones;
- and
- an initiating constituent selected from the group consisting of peroxide, peroxydicarbonate, azo free radical initiators and UV initiators.
A hydrophobic acrylamide copolymer comprising:
- a first constituent that is a hydrophobic acrylamide monomer, the hydrophobic acrylamide monomer being N-benzyl-N-isopropylacrylamide;
- and
- a second constituent that forms copolymers having glass transition temperatures of less than about 22° C.
Dependencies are inferred from the claim text.