Process for the preparation of a polysulfide
AssigneesShanghai Ici Research & Development & Management Co. Ltd., Akzo Nobel Chemicals International B.V.
InventorsOlaf Klobes, Jing He
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Abstract
Process for the preparation of polysulfide of formula (I) HS—(CH2)n—O—(CH2)m—O—(CH2)p—[S—S—CH2)nO—(CH2)m—O—(CH2)p]q—SH (I) wherein m is an integer in the range 1 to 4, n and p are integers in the range 1-10, and q is an integer in the range 1-60, by oxidizing a bismercaptodiether compound of formula (II) HS—(CH2)n—O—(CH2)m—O—(CH2)p—SH (II) with elemental sulfur in the presence of a base and a protic solvent. This process has a high selectivity towards linear disulfides.
Claims11
A process for the preparation of polysulfide of formula (I)
- HS—(CH2)n—O—(CH2)m—O—(CH2)p—[S—S—(CH2)n—O—(CH2)m—O—(CH2)p]q—SH (I)
- wherein m is an integer in the range 1 to 4, n and p are integers in the range 1-10, and q is an integer in the range 1-60,
- by oxidizing a bismercaptodiether compound of formula (II)
- HS—(CH2)n—O—(CH2)m—O—(CH2)p—SH (II)
- with elemental sulfur in the presence of a base and a protic solvent.
A process for the preparation of a liquid polysulfide of formula (I)
- HS—(CH2)n—O—(CH2)m—O—(CH2)p—[S—S—(CH2)n—O—(CH2)m—O—(CH2)p]q—SH (I)
- wherein m is an integer in the range 1 to 4, n and p are integers in the range 1-10, and q is an integer in the range 1-60,
- by oxidizing a bismercaptodiether compound of formula (II)
- HS—(CH2)n—O—(CH2)m—O—(CH2)p—SH (II)
- with elemental sulfur in the presence of a base and a protic solvent.
Dependencies are inferred from the claim text.