POLYSILOXANE COMPOSITION WITH IMPROVED SURFACE WETTING CHARACTERISTICS AND BIOMEDICAL DEVICES MADE THEREOF

摘要

POLYSILOXANE COMPOSITION WITH IMPROVED SURFACE WETTING CHARACTERISTICS AND BIOMEDICAL DEVICES MADE THEREOF The surface wetting characteristics of polysiloxanes prepared from monomeric polysiloxanes endcapped with activated unsaturated groups and modulus modifiers are improved by the inclusion of small amounts of an N-alkenoyl trialkylsilyl aminate. The improved polymeric compositions can be used to form hard, gas permeable contact lenses and other biomedical devices. BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to hard, gas permeable, biomedical devices including contact lenses prepared from polysiloxanes polymerized with a modulus modifier and an N-alkenoyl trialkylsilyl aminate wetting agent. 2. Prior Art Statement U. S. patent 4,153,641 discloses contact lenses made from polymers and copolymers comprising poly(organo-siloxane) polymers and copolymers formed by polymerizing a poly(organosiloxane) monomer alpha,omega terminally bonded through divalent hydrocarbon groups to polymerized, free radical polymerizably activated, unsaturated groups forming a polymer in a crosslinked network. Additionally, specific comonomers are disclosed which include lower esters of acrylic and methacrylic acid, styryls and N-vinyl pyrrolidinone which may be copolymerized with the above described poly(organosiloxane) to form a copolymer. The instant invention preferred polysiloxane monomers include the same poly(organosiloxane) monomers described above.