Patents Assigned to SHANGHAI ICI RESEARCH & DEVELOPMENT & MANAGEMENT CO. LTD.
  • Process for the preparation of a polysulfide
    Patent number: 9079833
    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.
    Type: Grant
    Filed: April 10, 2012
    Date of Patent: July 14, 2015
    Assignees: SHANGHAI ICI RESEARCH & DEVELOPMENT & MANAGEMENT CO. LTD., AKZO NOBEL CHEMICALS INTERNATIONAL B.V.
    Inventors: Olaf Klobes, Jing He