Patent ID: 9453577
Filing Date: 2016-09-27
CPC Classification: C08L,C09K,E21B,F16J

Claim Text:
1. A seal comprising: a first portion including a crosslinked product of: a first crosslinked polymer; and a second crosslinked polymer different from the first crosslinked polymer; the first crosslinked polymer being crosslinked with the second crosslinked polymer, the first crosslinked polymer comprising a crosslinked polyphenylene sulfide, crosslinked polyphenylsulfone, crosslinked self-reinforced polyphenylene, crosslinked polyethersulfone, or a combination comprising at least one of the foregoing, and the second crosslinked polymer comprising a crosslinked polyphenylene sulfide, crosslinked polyphenylsulfone, crosslinked self-reinforced polyphenylene, crosslinked polyethersulfone, or a combination comprising at least one of the foregoing; and a second portion including a polymer which is different than a constituent polymer in the first portion, wherein the seal has a gradient in glass transition temperature.