C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
88/40, 402/405,
C08F 226/08 (2006.01) C08F 220/10 (2006.01) C08F 220/12 (2006.01) C08F 220/28 (2006.01) C08F 271/02 (2006.01) G02B 1/04 (2006.01) G02C 7/04 (2006.01)
Patent
CA 1086898
ABSTRACT A plastic or resin product obtained by mixing a comminuted pyrrol- idone such as polyvinylpyrrolidone, and optionally modifiers and additives such as organic methacrylates, and optionally crosslinking agents, and opt- ionally catalysts, and causing polymerization to take place by elevating the temperature. The inventive product is insoluble in water but is hydratable with water, depending upon proportions of 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, dep- ending 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.
99349
Seiderman Maurice
Smart & Biggar
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