Method for preparing a crosslinked graft copolymer of silicone a

Details Method for preparing a crosslinked graft copolymer of silicone a Method for preparing a crosslinked graft copolymer of silicone a

1974-10-10

1976-05-25

Turer, Richard B.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

260827, 264 1, 351160, C08F 246, C08F 3008, G02C 704

Patent

active

039591026

ABSTRACT:
An improved flexible contact lens is provided having hydrophilic and lipophobic properties which allow extended duration of wear by eliminating or greatly reducing the risk of rupture of the natural tear film produced by the cornea. These properties are achieved by crosslinking a selected water soluble polymer which has been grafted onto a pre-formed substrate, for example crosslinking polyvinyl pyrrolidone which has been previously grafted onto a silicone substrate. The grafting and the crosslinking are accomplished in separate stages.

REFERENCES:
patent: 3639524 (1972-02-01), Seiderman et al.
patent: 3647736 (1972-03-01), Ewell
patent: 3700573 (1972-10-01), Laizier et al.
patent: 3700761 (1972-10-01), O'Driscoll et al.
patent: 3840448 (1974-10-01), Osborn et al.

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