Process for the preparation of polytetramethylene ether...

Details Process for the preparation of polytetramethylene ether... Process for the preparation of polytetramethylene ether...

C - Chemistry, Metallurgy

07

C

C07C 67/24 (2006.01) C07C 69/16 (2006.01) C08G 65/20 (2006.01) C08G 65/26 (2006.01) C08G 65/32 (2006.01)

Patent

CA 2142371

An improved process for the preparation of polytetramethylene ether glycol diesters of the formula R-CO- O(CH2-CH2-CH2-CH2-C7)n -COR1, in which R and R1 are identical or different and are an alkyl radical or a derivative thereof; by polymerization of tetrahydrofuran in the presence of a fixed-bed polymerization catalyst and in the presence of a carboxylic anhydride. The use of a catalyst selected from amorphous aluminium silicate, acid-activated and calcined kaolin or zeolite instead of the known natural montmorillonite catalysts having a cryptocrystalline three-layer structure means that polymers having more uniform properties and a narrower molecular weight distribution are now accessible at a higher po- lymerization rate

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