Soft contact lenses and process for preparation thereof

Details Soft contact lenses and process for preparation thereof Soft contact lenses and process for preparation thereof

1974-12-06

1976-09-28

Wong, Jr., Harry

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

20415914, 20415921, 20415922, 260630Y, 351160, 264 1, 526273, 526309, 526317, 526320, B29D 1100, C08G 200, C08F21800, C08F21602

Patent

active

039830837

ABSTRACT:
Soft contact lenses comprising a copolymer comprising at least one monomer of the general formula, ##EQU1## wherein X is H or CH.sub.3 and n is 2 or 3, at least one monomer of the general formula, ##EQU2## wherein X is H or CH.sub.3 and m is an integer of 4 to 13, and optionally at least one polymerizable monomer other than the monomers of the above-mentioned two groups are disclosed. These contact lenses are soft and flexible in the non-swollen state and are tougher and less susceptible to microbiological contamination than the hitherto known soft contact lenses. Also a novel process for preparation of these soft contact lenses is disclosed, which comprises cast-polymerizing a mixture of the above-mentioned monomers, cooling the resulting copolymer to a low temperature at which it stands rigid, and shaping the copolymer body into the lens form in the cooled rigid state.

REFERENCES:
patent: 3496254 (1970-02-01), Wichterle
patent: 3499862 (1970-03-01), Wichterle
patent: 3503942 (1970-03-01), Seiderman
patent: 3660545 (1972-05-01), Wichterle
patent: 3700761 (1972-10-01), O'Driscoll et al.
patent: 3822089 (1974-07-01), Wichterle

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