CONTROL OF GRAFTING PROCESSES

摘要

A continuous-flow process in which side-chains are grafted to a thermoplastic base polymer, especially the grafting of side-chains suitable for hydrolytic crosslinking, is controlled with reference to a measured theological property of the polymer. The melt property may be a true viscosity or a viscous modulus but any measurement that generates a number that correlates with viscosity can be used. The measurement is made on material at a place in the flow line where at least a substantial part of the grafting has taken place, preferably where it is (or ought to be) complete, and at least one reagent concentration or process condition is adjusted to maintain the measured property within limits that are preset, either absolutely or with reference other prevailing conditions.