Low permeability nanocomposites
CA 2449075 C · Owner: Exxonmobil Chemical Patents Inc. · Inventors: Dias, Anthony J.; Tsou, Andy H.; Chung, David Y.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention includes blends of a halogenated elastomer such as a butyl rubber or an interpolymer of, on one embodiment a C4 to C7 , isomonoolefin, a para-methylstyrene and a para-(halomethylstyrene) the , interpolymer having been pre-mixed with an exfoliating compound and clay the , entire blend forming a nanocomposite in one embodiment. The clay may or may not have undergone an additional exfoliating treatment prior to blending with the halogenated elastomer. The interpolymer/clay mixture forms a distinct phase in the nanocomposite blend of the invention. The blend of the invention has improved air barrier properties and is suitable as an air barrier.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed May 29, 2002 and granted February 1, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 29, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 29, 2024.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.