Poly(arylene sulfide sulfone) polymer containing ether groups
CA 1311085 C · Owner: Geibel, Jon · Inventors: Bobsein, Rex L.; Edmonds, James T. Jr.; Geibel, Jon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A two-step process to make a poly(arylene sulfide sulfone) polymer exhibiting improved high temperature properties is described. In the first step a prepolymer characterized as dihalo-terminated polyethersulfone oligomers is prepared by reacting an aromatic diphenol with an excess of a dihalo aromatic sulfone. In the second step the excess dihalo aromatic sulfone and the oligomers are copolymerized in the presence of a sulfur source to form a poly(arylene sulfide sulfone) polymer. An alkali metal carboxylate is present in the second step. The polymers exhibit improved softening temperature and glass transition temperature and are useful in high temperature applications.
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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
- Granted December 1, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 1, 2009.
- 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
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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.