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US 6,747,122 B2Granted
Process for the preparation of polymeric sulfur compounds
AssigneeBayer Aktiengesellschaft
InventorsJosef Hahn, Marco Runk, Hermann-Josef Weidenhaupt, Hartmuth Buding
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Abstract
The invention relates to a simple process for the preparation of polymeric sulfur compounds with polythiocyclopentanediyl structural elements which are used as vulcanizing agents for diene rubbers.
Claims7
A process for the preparation of polymeric sulfur compounds of the formula
- wherein the substituents
- R1 and R2 are identical or different and represent hydrogen or methyl,
- n and m denote integers in the range from 2 to 12 and
- x denotes an integer in the range from 2 to 500,
- comprising the step of reacting (methyl)cyclopentadiene with sulfur and hydrogen sulfide at 100° to 180° C. in the presence of a catalyst, the molar ratio of sulfur to hydrogen sulfide being 1:0.1 to 1:5 and the molar ratio of (methyl)cyclopentadiene to sulfur being 1:1 to 1:9.
2 more elements
Dependencies are inferred from the claim text.