Aromatic bromination of polystyrene using bromine as the reaction solvent
CA 1297628 C · Owner: Sanders, David C. · Inventors: Stahl, Robert J.; Sands, John L.; Sanders, David C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the bromination of polystyrenic homoand co-polymers using bromine as the reaction medium bromine, chloride as the bromination reagent and a Lewis acid catalyst. The brominated styrenic polymer is recovered from the reaction mixture and has improved product quality. The degree of bromination of the styrenic polymers is controlled by adjusting the molar ratio of the bromination reagent to polystyrene and, can yield an average of from about 1 to about 5 bromine atoms per aromatic unit.
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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 March 17, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 17, 2009.
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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.