Silicone-containing contact lens material and contact lenses mad

Details Silicone-containing contact lens material and contact lenses mad Silicone-containing contact lens material and contact lenses mad

1985-10-04

1989-05-02

Briggs, Sr., Wilbert J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526279, C08F23008

Patent

active

048269360

ABSTRACT:
According to the invention contact lenses are formed of unsaturated, multifunctional, organosiloxanes alone or mixed with monofunctional organosilanes and in some cases a hardening agent such as methyl methacrylate, hydrophilic monomer wetting agents, and itaconate hydrophilic and hardening agents. In the preferred embodiment, an additional hydrophilic cross-linking agent is used and the multifunctional organosiloxane is less than 50% of the organosiloxane used. The multifunctional organosiloxane adds higher impact strength and reduces brittleness, probably due to greater cross-linking density in the final product and retains the desirable properties of silicone-containing materials for use in contact lenses.

REFERENCES:
patent: 4248989 (1981-02-01), Novicky
patent: 4276402 (1981-06-01), Chromecek et al.
patent: 4582884 (1986-04-01), Ratkowsks

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