Silicone rubber composition

摘要

A means for restraining hardening of silicone rubber is provided. In one form, a silicone rubber composition is provided that contains an antioxidant dispersed therein. In addition, a method for preparing the silicone rubber composition is provided that includes: a step of mixing a silicone rubber precursor and the antioxidant and curing the obtained mixture; or a step of wetting the silicone rubber with a liquid antioxidant. A method of manufacturing a medical device is also provided, including: a step of incorporating into a medical device the silicone rubber composition obtained in the preparation method outlined above; a step of seal packaging the obtained medical device; and a step of irradiating the seal-packaged medical device with radiation.

主权项

1. A valve body for a medical device to be sterilized with radiation, the valve body being made from a silicone rubber composition comprising a crosslinked polysiloxane silicone rubber, an antioxidant, and polydimethylsiloxane, the antioxidant and polydimethylsiloxane in amounts effective to restrain crosslinking of radicals generated during radiation sterilization;
wherein the silicone rubber composition is an elastic composition that includes 0.1 to 5 percent of the antioxidant and about 1 to about 30 percent of the polydimethylsiloxane; and wherein the antioxidant includes tert-butylhydroxyanisole, vitamin E, derivatives of vitamin E or a salt of vitamin E or the derivatives.