Pyrrolidone-methacrylate graft copolymers from 3-stage polymeriz

Details Pyrrolidone-methacrylate graft copolymers from 3-stage polymeriz Pyrrolidone-methacrylate graft copolymers from 3-stage polymeriz

1974-11-21

1976-08-31

Tillman, Murray

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

128213, 128260, 264 1, 350 96R, 351160, 424 28, 428542, C08L 3102

Patent

active

039781640

ABSTRACT:
A contact lens composition, having improved dimensional stability, suitable for use in the preparation of a corrective hydrated lens or an eye bandage, comprises polymerized random graft copolymers containing (in the dry state) from 67.2 to 79.3% HEMA; from 14.25 to 35% PVP; from 0.1 to 4.04% EDMA; from 0.1 to 2.5% MA; from 0.1 to 5.0% water; from 0 to 4 ppm HQ inhibitor; and from 50 to 250 ppm MEHQ inhibitor. The contact lens composition contains from 45 to 65% water after hydration. An improved method for shaping, polymerizing, and cutting and hydrating the contact lens composition is provided. The polymerization is conducted using only a low temperature initiator, by de-gassing prior to polymerization to remove substantially all oxygen, and by conducting the initial polymerization reaction at from 23.degree. to 30.degree.C for 16 to 30 hours, during which the heat of the reaction is continuously absorbed to control the reaction exotherm. A closed, rod-shaped casting mold, lined with a polyester film material, is used and the polymeric rod obtained may be cut, machined and polished to obtain the contact lens composition. Thereafter, hydration is conducted in a buffered, 0.85 to 0.9% saline solution, at a pH of 7.0 to 7.1.

REFERENCES:
patent: 3621079 (1971-11-01), Leeds
patent: 3639524 (1972-02-01), Seiderman
patent: 3647736 (1972-03-01), Ewell
patent: 3807398 (1974-04-01), Grucza
patent: 3822196 (1974-07-01), O'Driscoll et al.
patent: 3839304 (1974-10-01), Hovey

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