Process for the preparation of a polysulfide

US9079833B2 · kind B2 · utility

Assignees

• SHANGHAI ICI RESEARCH & DEVELOPMENT & MANAGEMENT CO. LTD. · CN
• Akzo Nobel Chemicals International B.V · NL

Inventors

• Olaf Klobes · Reichenbach, DE
• Jing He · Mississauga, CA

Key dates

• Filing date: Apr 10, 2012
• Grant date: Jul 14, 2015
• Expiry date: Apr 10, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G75/14
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

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.