Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1973-05-29
1976-02-10
Phynes, Lucille M.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 8072, 264 1, 351160T, C08L 3906, B29D 1100, G02C 704
Patent
active
039376800
ABSTRACT:
A hydrophilic terpolymer suitable for manufacture into shaped articles, said terpolymer being substantially the polymerization product of hydroxyalkyl acrylate or methacrylate, a vinyl comonomer having a high affinity for water, e.g. N-vinyl pyrrolidone, and a polymerizable, unsaturated carboxylic acid, e.g. methacrylic or acrylic acid. The terpolymer is particularly adaptable for use as a contact lens by bringing it in contact with a buffered aqueous alkaline solution thereby affording a hydrogel having a water content between about 55-85% by weight of the total.
A preferred embodiment of the invention is the polymerization product of a reaction mixture comprising 30-50% by weight of vinyl pyrrolidone, up to about 3% of a crosslinking agent such as ethylene glycol di-methacrylate, methacrylic acid amounting to about 0.25--3.5% by weight, and 2-hydroxyethyl methacrylate which constitutes the balance.
REFERENCES:
patent: 3639524 (1972-02-01), Seiderman
patent: 3721657 (1973-03-01), Seiderman
patent: 3787380 (1974-01-01), Stamberger
patent: 3792028 (1974-02-01), Seiderman
patent: 3803093 (1974-04-01), Neefe
Boland Thomas R.
Global Vision, Inc.
Phynes Lucille M.
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