Process for the preparation of thermoplastic aromatic...

Details Process for the preparation of thermoplastic aromatic... Process for the preparation of thermoplastic aromatic...

C - Chemistry, Metallurgy

08

G

402/174

C08G 63/68 (2006.01) C08G 79/04 (2006.01)

Patent

CA 1199749

Process for the preparation of thermoplastic aromatic polyphosphonates containing small proportions of carbonate structures A b s t r a c t The subject of the present invention is a process for the preparation of polyphosphonates containing carbonate structures in amounts of 0.3 to 4.5 mol %, relative to the sum of phosphonate and carbonate structural units, which is characterised in that diaryl phosphonates are reacted with diphenols in the presence of neutral transesterification catalysts, and the reaction is then completed by adding diaryl carbonate.

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