Increasing the molecular weight of polycondensates

Details Increasing the molecular weight of polycondensates Increasing the molecular weight of polycondensates

C - Chemistry, Metallurgy

08

K

C08K 5/5333 (2006.01) C08G 63/80 (2006.01) C08G 64/20 (2006.01) C08G 64/40 (2006.01) C08G 69/06 (2006.01) C08G 69/48 (2006.01) C08J 11/04 (2006.01) C08K 5/5313 (2006.01) C08L 67/02 (2006.01) C08L 69/00 (2006.01) C08L 77/00 (2006.01)

Patent

CA 2200339

The invention relates to a process for increasing the molecular weight of polycondensates, which comprises heating a polycondensate in the temperature range below the melting point and above the glass transition temperature in the solid phase of the polymer with addition of at least one sterically hindered hydroxyphenylalkylphosphonic ester or monoester.

On décrit un procédé d'augmentation de la masse moléculaire de polycondensats, consistant à chauffer un polycondensat dans une plage de température se situant au-dessous du point de fusion et au-dessus de la température de transition vitreuse, dans la phase solide du polymère, avec l'adjonction d'au moins un ester ou monoester hydroxyphénylalkylphosphonique à empêchement stérique.

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