Elevated, declining pressure dehydration of poly(arylene sulfide) prepolymerization mixture
CA 1182247 A · Owner: Phillips Petroleum Company · Inventors: Sherk, Fred T.; Hammer, Harry B. Iii
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for dehydrating pre-polymerization mixtures in the preparation of poly(arylene sulfide) in which a reaction mixture of a sulfur source and an organic amide are contacted at a first pressure within a range of about 20 psig to about 60 psig and an initial temperature in a range of about 300°F to 400°F to form a complex of the reactants with the mixture subsequently subjected to a decrease in pressure while elevating the temperature to a second temperature at which, at the chosen pressure, essentially all water is removed from the mixture. Other compounds including bases alkali metal, carboxylates, alkali metal carbonates lithium halides, and lithium, borate can be present in the …
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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 February 5, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 5, 2002.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.