Contact lens and compositions

• US 4,463,148 A
• Filed: 05/06/1983
• Issued: 07/31/1984
• Est. Priority Date: 01/25/1980
• Status: Expired due to Term

• Current Assignee: CIBA Vision Corporation (Bayer AG)
• Original Assignee: Titmus Eurocon Kontaktlinsen GmbH
• Inventors: Muller, Ulrich, Hofer, Peter, Muller-Lierheim, Wolfgang, Schafer, Horst, Barenz, Manfred
• Primary Examiner(s): Wong, Jr., Harry
• Application Number:
  US06/490,209
• Time in Patent Office: 452 Days
• Field of Search: 526/264, 526/307.5, 526/312, 526/317
• US Class Current: 526/264
• CPC Class Codes: G02C 7/04 Contact lenses for the eyes disinfection or sterilisation of contact lenses A61L12/00

Abstract

A soft contact lens having in preferred embodiment an elliptical inside surface which has a numerical eccentricity of 0.2 to 0.5 and a zenith radium of curvature of 8.0 to 8.4 mm. It preferably consists of a copolymer comprising of 50% to 90% hydroxyethyl-methacrylate (HEMA) by weight, 2% to 20% one or more unsaturated carboxylic acids, 2% to 20% one or more base monomers, 5% to 25% aliphatic acrylate or methacrylate, and 0.1% to 1% of a dialkylene-glycol-dimethacrylate crosslinker.

Claims

1. A soft contact lens comprising a copolymer, consisting of 50% to 90% hydroxy-ethyl-methacrylate (HEMA) by weight, 2% to 20% of one or more unsaturated carboxylic acids selected from the group consisting of acrylic acid and methacrylic acid, 2% to 20% one or more basic monomers selected from the group consisting of acrylamide, methacrylamide, dimethylaminoethyl methacrylate, dimethylaminopropyl methacrylate, N-vinyl-pyrrolidone and N-vinyl-delta-lactam, 5% to 25% of an aliphatic ester of acrylic acid or methacrylic acid and 0.1% to 1% of at least one dialkylene-glycol-dimethacrylate cross-linker selected from the group consisting of ethylene-diethylene-dipropylene-, and triethylene-glycol-dimethyacrylate.

2. The lens according to claim 1, wherein the unsaturated carboxylic acid is acrylic acid or methacrylic acid;

the base monomer is acrylamide, methacrylamide, dimethyl-aminoethyl-methacrylate, dimethylaminopropyl methacrylate, N-vinyl pyrrolidone or N-vinyl-deltalactam; and

the cross-linker is a diethlene- or dipropylene-glycol-dimethacrylate.

3. A lens as claimed in claim 1 as follows:

HEMA 77.8% by weight,

N-vinyl pyrrolidone 3.4% by weight,

methacrylic acid 5.2% by weight,

butyl-methacrylate 12.9% by weight, and

triethylene-glycol-dimethacrylate 0.7% by weight.

4. A lens as claimed in claim 1 as follows:

HEMA 78.35% by weight,

N-vinyl pyrrolidone 3.5% by weight,

methacrylic acid 5.0% by weight,

butyl-methacrylate 13.0% by weight, and

ethylene glycol-dimethacrylate 0.15% by weight.

5. A lens as claimed in claim 1 as follows:

HEMA 74.5% by weight,

N-vinyl pyrrolidone 7.05% by weight,

methacrylic acid 7.05% by weight,

butyl-methacrylate 11.30% by weight, and

triethylene-glycol-dimethacrylate 0.10% by weight.

6. A lens as claimed in claim 1 as follows:

HEMA 56% by weight,

N-vinyl pyrrolidone 18.5% by weight,

methacrylic acid 15.5% by weight,

butyl-methacrylate 5.0% by weight, and

triethylene-glycol-dimethacrylate 0.1% by weight.