METHOD OF MODIFYING PHYSICAL, RHEOLOGICAL AND THERMOMECHANICAL CHARACTERISTICS OF A POLAR THERMOPLASTIC POLYMER

摘要

Method of modifying rheological characteristics of a polar thermoplastic polymer, in particular a PET that aims to increase its melt viscosity while retaining and/or improving its physical and thermomechanical characteristics, that comprises reacting said polar thermoplastic polymer with a two-component system composed of at least one diisocyanate having a functionality greater than or equal to 2 and of at least one polyol having a functionality, of the secondary alcohol functional group, greater than or equal to 5.