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:
Sep. 12, 2017
Filed:
Aug. 15, 2012
Esther E. Quintanilla, Antwerpen, BE;
Hanno R. Van Der Wal, Hoek, NL;
Daniel C. Floyd, Richmond, VA (US);
Myriam Linke, Terneuzen, NL;
Francois M. Casati, Pfaffikon, CH;
Carlos M. Villa, Lake Jackson, TX (US);
Jean-paul Masy, Destelbergen, BE;
Ricco B. Borella, Shindellegi, CH;
Paul Cookson, Samstagern, CH;
Esther E. Quintanilla, Antwerpen, BE;
Hanno R. Van Der Wal, Hoek, NL;
Daniel C. Floyd, Richmond, VA (US);
Myriam Linke, Terneuzen, NL;
Francois M. Casati, Pfaffikon, CH;
Carlos M. Villa, Lake Jackson, TX (US);
Jean-Paul Masy, Destelbergen, BE;
Ricco B. Borella, Shindellegi, CH;
Paul Cookson, Samstagern, CH;
Dow Global Technologies LLC, Midland, MI (US);
Abstract
Ethylene carbonate is polymerized by itself or together with another cyclic monomer such as 1,2-propylene oxide in the presence of a double metal cyanide catalyst. Most of the ethylene carbonate adds to the chain to form a terminal carbonate group, which decarboxylates to produce a hydroxyethyl group at the end of the polymer chain. The polymerization of more ethylene carbonate onto the chain end results in the formation of poly(ethyleneoxy) units. Therefore, the process provides a method for making poly(ethyleneoxy) polymers without the need to polymerize ethylene oxide. The process is useful for making polyethers that are useful as water-absorbable polymers, surfactants and as raw materials for polyurethanes. The process is also useful for increasing the primary hydroxyl content of a polyether.