POLYKETONES HAVING IMPROVED BARRIER PROPERTIES

摘要

A melt processed barrier material having an oxygen permeability of less than 1 X 10<-13> cc.cm cm<-2> s<-1> cmH<-1> at 23 DEG C, 75% relative humidity (RH), which is obtainable by: A) melt processing a polyketone polymer composition comprising a polyketone polymer having an alternating structure of (a) units derived from carbon monoxide, and (b) units derived from ethylene and optionally no more than 5.75 mole % of units derived from an alpha olefin selected from the group consisting of propene and butene at a temperature which is less than 15 DEG C above the melting point of the polyketone polymer and maintaining the polyketone polymer composition at the melt processing temperature for less than 3 minutes, and B) crash cooling the polyketone polymer composition at a rate of above 20 DEG C per minute.