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. 07, 2015
Filed:
Dec. 06, 2010
Method for continuously producing low equivalent weight polyols using double metal cyanide catalysts
John W. Weston, Sugar Land, TX (US);
Carlos M. Villa, Lake Jackson, TX (US);
Jean-paul Masy, Destelbergen, BE;
Kevin C. Seavey, Clute, TX (US);
John W. Weston, Sugar Land, TX (US);
Carlos M. Villa, Lake Jackson, TX (US);
Jean-Paul Masy, Destelbergen, BE;
Kevin C. Seavey, Clute, TX (US);
Dow Global Technologies LLC, Midland, MI (US);
Abstract
Polyether polyols having equivalent weights of up to 500 are continuously prepared in the presence of a double metal cyanide catalyst. A first step of the reaction is performed at a temperature of at least 150° C., while controlling the hydroxyl content and unreacted alkylene oxide content of the reaction mixture to within certain ranges. A portion of that reaction mixture is withdrawn and permitted to react non-isothermally to consume the unreacted alkylene oxide. This process is highly efficient, does not result in catalyst deactivation, as is commonly seen in previous processes, and does not produce a significant ultra high molecular weight tail.