Hydrophilic contact lens material

Details Hydrophilic contact lens material Hydrophilic contact lens material

1974-05-20

1976-10-12

Levin, Stanford M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260486R, 264 1, 351160, C08L 2902, C08F21604

Patent

active

039856976

ABSTRACT:
A terpolymer material for the formation of soft contact lenses includes a major amount of hydroxy alkyl acrylate or methacrylate, between 0.01 and 0.25% of a diester cross-linking agent containing acrylic or methacrylic groups and having no free hydrophilic groups, and between about 0.5 and 10% of a free acid (typically acrylic or methacrylic acid) having an unsaturated double bond. The material is polymerized in the non-aqueous state to form a rigid terpolymer having physical characteristics established by the diester concentration. The non-hydrated terpolymer can be formed into a contact lens using conventional lens grinding techniques. Upon subsequent hydration, the water concentration of the terpolymer is determined by the free acid concentration in the starting composition.

REFERENCES:
patent: 3598770 (1971-08-01), Moore et al.
patent: 3780003 (1973-12-01), Seymour et al.
patent: 3850892 (1974-11-01), Shen et al.

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