Patent ID: 6787610
Filing Date: 2004-09-07
Classification: C08G,C08L

Abstract:
A plasma-resistant fluorine-based elastomer sealing material comprising a fluorine-based elastomer having a divalent perfluoropolyether or divalent perfluoroalkylene structure in the main chain thereof and having two or more hydrosilyl groups and addition-reactive alkenyl groups in the terminals or side chains thereof, and a polymer having two or more hydrosilyl groups in the molecule and being capable of addition reacting with the alkenyl groups, the fluorine-based elastomer being crosslinked with the polymer, wherein the sealing material has a dielectric constant of 2.5 or less and a dielectric dissipation of 0.01 or less in a microwave band of from 1 GHz to 30 GHz.