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US 5,290,321 AGranted
Process for preparation of granular .mu.-sulfur having improved flowability, as a vulcanizing agent of rubber composition
AssigneeShikoku Chemicals Corporation
InventorsYukihiro Koga, Tadahiko Matsuoka, Masatoshi Sasa
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Abstract
An organic solvent alone or together with a rubber process oil is added to a powder of .mu.-sulfur, the mixture is granulated, and the granulation product is heated at a temperature lower than 120.degree. C. to evaporate the organic solvent, whereby granular .mu.-sulfur having an improved flowability is obtained. This granular .mu.-sulfur is valuable as a rubber-vulcanizing agent.
Claims6
A process for the preparation of granular .mu.-sulfur, comprising the steps of:
- adding a liquid organic compound having a boiling point lower than 120.degree. C. as a binding agent to a powder of .mu.-sulfur in an amount of 0.3 to 0.7 liter of the liquid organic compound per kg of the powder of .mu.-sulfur, mixing the powder with the binding agent, granulating the mixture and drying the granulated mixture by heating at a temperature lower than 120.degree. C. to form the granular .mu.-sulfur.
A process for the preparation of granular .mu.-sulfur, comprising the steps of:
- adding a liquid organic compound having a boiling point lower than 120.degree. C. and a rubber process oil as binding agents to a powder of .mu.-sulfur in an amount of 0.2 to 0.6 liter of the liquid organic compound and 0.01 to 0.3 kg of the rubber process oil, respectively, per kg of the powder of .mu.-sulfur, mixing the powder with the binding agents, granulating the mixture, and drying the granulated mixture by heating at a temperature lower than 120.degree. C. to form the granular .mu.-sulfur.
Dependencies are inferred from the claim text.