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US 2008/0293902 A1Published application
Mercaptan mixture
AssigneeLANXESS Deutschland GmbH
InventorsWerner Obrecht, Stephen Pask, Wilfried Kohler, Michael Klimpel
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Abstract
A novel mixture containing a number of particular mercaptans, a process for preparing it and its use as advantageous molecular weight regulator in the production of synthetic rubbers are provided.
Claims22
A process for preparing a mixture containing
- 2,2,4,6,6-pentamethylheptane-4-thiol,
- 2,4,4,6,6-pentamethylheptane-2-thiol,
- 2,3,4,6,6-pentamethylheptane-2-thiol and
- 2,3,4,6,6-pentamethylheptane-3-thiol,
- comprising reacting hydrogen sulphide with triisobutene at temperatures of from 0° C. to −60° C. in a continuous process, wherein
- (a) the hydrogen sulphide is subjected to drying before the reaction,
- (b) the triisobutene used has a water content of not more than 70 ppm,
- (c) boron trifluoride is used as catalyst in amounts of not more than 1.5% by weight, based on the triisobutene used,
- (d) the reaction is carried out in the absence of compounds which form complexes with boron trifluoride and
- (e) the reaction mixture is brought into contact with an aqueous alkaline solution after the reaction to remove the catalyst.
7 more elements
A mixture comprising 2,2,4,6,6-pentamethylheptane-4-thiol, 2,4,4,6,6-pentamethyl-heptane-2-thiol, 2,3,4,6,6-pentamethylheptane-2-thiol and 2,3,4,6,6-pentamethylheptane-3-thiol.
Dependencies are inferred from the claim text.