Method for increasing the molecular weight of polyamides with acid catalysts or organophosphonic esters in the presence of alumina containing TiO2.

摘要

PRESENTS A PROCESS FOR INCREASING THE MOLECULAR WEIGHT OF A POLYAMIDE IN THE PRESENCE OF TITANIUM DIOXIDE CONTAINING ALUMINA, said process comprising heating a polyamide CONTAINING A carboxide TERMINAL AND GROUPS OF AMINO, AND TITANIUM DIOXIDE CONTAINING ALUMINA IN THE PRESENCE OF AN AMOUNT catalytically effective of at least one phosphonic acid catalyst and / or an ester thereof selected from: R (CH2) NPO3R12 wherein R is 2-pyridyl O 2-methoxyphenyl; Each R1 is independently selected from C1-C10 HO; N is 0 or an integer between 2 and 5 with the proviso that n is 0 when R is 2-methoxyphenyl.