Contact lens from hydrophilic gel polymers of polyvinylpyrrolido

Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal

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260876R, 264 1, 351160, 526227, 526320, C08L 3102

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active

039668479

ABSTRACT:
A plastic or resin product is obtained by mixing polyvinylpyrrolidone, modifiers and additives such as organic methacrylates, and crosslinking agents, and optionally catalysts, and causing polymerization to take place. The inventive product is insoluble in water but is hydratable with water, depending upon the proportions of the above mentioned components, and may take up in its structure as little as 5% by weight of water to as high as 90% by weight of water. The inventive hydrated product is optionally transparent, translucent, or opaque, and produced in any shape or size, depending only on the mold in which it is cast. The transparent product is especially suitable for contact lenses. The translucent and opaque products may be fabricated into membranes with pore sizes that can be made selectively, or cast into useful shapes and for other uses.

REFERENCES:
patent: 3520949 (1970-07-01), Shepherd et al.
patent: 3621079 (1971-11-01), Leeds
patent: 3639524 (1972-02-01), Seiderman
patent: 3647736 (1972-03-01), Ewell
patent: 3700761 (1972-10-01), O'Driscoll et al.
patent: 3721657 (1973-03-01), Seiderman
patent: 3822196 (1974-07-01), O'Driscoll et al.

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