Dow Global Technolgoies LLC

Nima N Nikbin

David A Babb

William Hoy Heath

Arjun Raghuraman

John G Pendergast, Jr

Robin Paul Ziebarth

Anna Forlin

Carlos M Villa

Marinus A Bigi

John W Weston

Matthias Schaefer

David K Steelman

Irfan Khan

Maria Jose Nieves Remacha

John G Pendergast

Jean-Paul Masy

Alkylene carbonates are removed from polyether-carbonate polymers by contacting the polyether-carbonate with an absorbent at a temperature of 30 to 150° C. The process is effective and inexpensive. The purified polyether-carbonate is useful for making polyurethanes as well as in many other applications.

Purification process for polyether-carbonate polyols

Polycarbonate polyols are made by copolymerizing carbon dioxide and an alkylene oxide in the presence of a starter compound and a carbonate catalyst. The process is operated in semi-batch mode by combining starter, catalyst and a small amount of alkylene oxide in a reaction vessel, pressurizing the vessel with carbon dioxide, initiating polymerization, and then feeding both carbon dioxide and alkylene oxide to the vessel under polymerization conditions without removal of product until the feeds are completed.

Semi-batch process for making polycarbonate polyols via copolymerization of carbon dioxide and an oxirane

A method of manufacturing a poly(ether-carbonate) polyol comprises a polymerization stage that includes polymerizing carbon dioxide and at least one alkylene oxide, with a starter, in the presence of a double metal cyanide polymerization catalyst and a catalyst promoter that is devoid of halide anions and cyanide. The catalyst promoter is separate from the double metal cyanide polymerization catalyst.

Polycarbonate based polyols

Alkylene oxides are polymerized in a tubular reactor. The alkylene oxide is continuously introduced into the tubular reactor through multiple introduction points located along the length of the tubular reactor. Monomer flow rates are increased along the length of the reactor to maintain a nearly constant concentration of unreacted alkylene oxide.

Alkoxylation process using tubular reactor

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Nima N Nikbin