A PROCESS FOR CONTROLLING WATER TREES

摘要

A process for controlling the length of water trees in a copolymer of ethyle ne and one or more alpha-olefins having 3 to 12 carbon atoms, which will be exposed to moisture, comprising selecting a copolymer with (1) a density in the range of 0.860 to 0.930 gram per cubic centimeter and (2) a melt flow ratio having at least about a value determined by the following formula: 2.7183 to the power of {[(6.184 times the density selected from the range se t forth above) minus 5.21] divided by 0.08898}.