Optically clear filled silicone elastomers

Details Optically clear filled silicone elastomers Optically clear filled silicone elastomers

1976-03-17

1976-12-07

Jacobs, Lewis T.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 465UA, 260825, C08L 8304

Patent

active

039961893

ABSTRACT:
Reinforced silicone elastomers, having improved tensile strength and particularly tear strength, include at least copolymers of aryl siloxanes and alkyl siloxanes, in a ratio of aryl to alkyl substituents providing 6 to 16 mole percent phenyl chosen to provide a refractive index matched to the index of refraction of a silica filler, form optically clear material useful for soft contact lenses. Preferably two copolymers are used and each has methyl groups with 6 to 16 mole percent phenyl groups. One of the two copolymers contains terminal vinyl groups and the other copolymer contains terminal (R).sub.2 HSi--O-- groups. Platinum materials are used to catalyze the vulcanization of the copolymer mix. These elastomers are useful for a variety of optical products, e.g., contact lenses, intraocular implants and the like.

REFERENCES:
patent: 3197433 (1965-07-01), Lamoreaux
patent: 3491165 (1970-01-01), Seyfried et al.
patent: 3808178 (1974-04-01), Gaylord

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