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US 9,657,158 B2Granted
Process for producing brominated butyl rubber
AssigneeArlanxeo Deutschland GmbH
InventorsRicarda Leiberich, Joachim Ritter, Hanns-Ingolf Paul, Udo Wiesner, Holger Luesgen
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Abstract
The invention relates to an energy efficient, environmentally favorable process for the preparation of brominated butyl rubbers, that uses a bromination agent and a oxidizing agent in order to enhance the utilization of bromine contained in the bromination agent. In a preferred embodiment a common medium for both solution polymerization and subsequent bromination of the rubber is employed.
Claims20
A process for the preparation of cements comprising aliphatic medium and at least one brominated butyl rubber, the process comprising:
- a) contacting butyl rubber cement comprising aliphatic medium with elemental bromine in the presence of hydrogen peroxide in a continuous process to brominate butyl rubber contained in the butyl rubber cement and produce a heterophasic mixture comprising:
- a cement comprising aliphatic medium and brominated butyl rubber, and
- an aqueous phase;
- and
- b) separating the cement comprising aliphatic medium and brominated butyl rubber from the aqueous phase.
2 more elements
Dependencies are inferred from the claim text.