The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 14, 2015
Filed:
Apr. 10, 2012
Olaf Klobes, Greiz, DE;
Jing He, Shanghai, CN;
Olaf Klobes, Greiz, DE;
Jing He, Shanghai, CN;
SHANGHAI ICI RESEARCH & DEVELOPMENT & MANAGEMENT CO. LTD., Shanghai, CN;
AKZO NOBEL CHEMICALS INTERNATIONAL B.V., Amersfoort, NL;
Abstract
Process for the preparation of polysulfide of formula (I) HS—(CH)—O—(CH)—O—(CH)—[S—S—CH)O—(CH)—O—(CH2)]—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—(CH)—O—(CH)—O—(CH)—SH (II) with elemental sulfur in the presence of a base and a protic solvent. This process has a high selectivity towards linear disulfides.