Inventors:
Mark L. Kasakevich - Missouri City TX
Donald H. Krasner - Houston TX
Jerry W. Secrist - Katy TX
Assignee:
Shell Oil Company - Houston TX
International Classification:
B29C 4788
Abstract:
A process is disclosed for the formation of polybutylene pipes having improved mechanical properties, by reduction in the rate of cooling of the extrudate used to form the pipe sections. Preferably, the ratio of the cooling bath residence time in minutes divided by the cooling water temperature in degrees Fahrenheit is selected to be in the range of from about 0. 004 to about 0. 010.