AUMENTO DEL PESO MOLECULAR DE POLICONDENSADOS.

摘要

PCT No. PCT/EP95/03937 Sec. 371 Date Apr. 9, 1997 Sec. 102(e) Date Apr. 9, 1997 PCT Filed Oct. 5, 1995 PCT Pub. No. WO96/11978 PCT Pub. Date Apr. 25, 1996The 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 additionof at least one sterically hindered hydroxyphenylalkylphosphonic ester or monoester.