Process for producing novel block alkylene polycarbonate...

Details Process for producing novel block alkylene polycarbonate... Process for producing novel block alkylene polycarbonate...

C - Chemistry, Metallurgy

08

G

400/2013

C08G 64/00 (2006.01) C08G 64/18 (2006.01) C08G 64/32 (2006.01)

Patent

CA 1276331

ABSTRACT The present invention is a novel class of block copolymers and a process of making the same. An alkylene oxide is reacted with CO2 in an organic solvent in the presence of an organometallic catalyst to form a polyalkylene carbonate. A second alkylene oxide is subsequently added without the addition of catalyst. The resulting product is a block copolymer comprising distinct, covalently linked, alkylene carbonate blocks. Such products are used in lost foam applications, e.g., evaporative pattern castings.

533617

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