Optically clear filled silicone elastomers

Details Optically clear filled silicone elastomers Optically clear filled silicone elastomers

C - Chemistry, Metallurgy

08

L

88/40, 400/5154

C08L 83/04 (2006.01) C08K 3/36 (2006.01) G02B 1/04 (2006.01) G02C 7/04 (2006.01)

Patent

CA 1043491

ABSTRACT OF THE DISCLOSURE 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)2HSi-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, intra-ocular implants and the like.

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