公开(公告)号：US3654253A

公开(公告)日：1972-04-04

申请号：US3654253D

申请日：1969-10-31

申请人： KLAUS STEIGERWALD ,  OSKAR BUECHNER ,  WOLFGANG BALL ,  HELMUT PFANNMUELLER ,  FRIEDRICH URBAN

发明人： STEIGERWALD KLAUS ,  BUECHNER OSKAR ,  BALL WOLFGANG ,  PFANNMUELLER HELMUT ,  URBAN FRIEDRICH

IPC分类号： C08F10/00 ,  C08F3/04 ,  C08F1/60 ,  C08F1/80

CPC分类号： C08F10/00 ,  C08F4/28

摘要： PRODUCTION OF ETHYLENE HOMOPOLYMERS AT ELEVATED TEMPERATURE UNDER SUPERATMOSPHERIC PRESSURE IN A TUBE REACTOR HAVING TWO SUCCESSIVE REACTION ZONES, A MIXTURE OF ETHYLENE, POLYMERIZATION INITIATOR AND POLYMERIZATION MODIFIER BEING INTRODUCED CONTINUOUSLY AT THE BEGINNING OF EACH REACTION ZONE. AT THE BEGINNING OF THE FIRST REACTION ZONE A MIXTURE OF ETHYLENE, AN ORGANIC HYDROPEROXIDE HAVING A HALF VALUE TEMPERATURE IN THE RANGE FROM 200* TO 260*C. AND A POLYMERIZATION MODIFIER HAVING A C5 VALUE OF FROM 2.0X10**-2 TO 1.0X10**-4 IS INTRODUCED AND AT THE BEGINNING OF THE SECOND REACTION ZONE A MIXTURE OF AN ORGANIC PEROXIDE HAVING A HALF VALUE TEMPERATURE IN THE RANGE FROM 150* TO 195*C. AND A POLYMERIZATION MODIFIER HAVING A C5 VALUE OF FROM 2.0 X10**-2 TO 1.0X10**-4 IS INTRODUCED. THE HALF VALUE TEMPERATURES OF THE TWO ORGANIC PEROXIDES AT LEAST 20*C. APART. THE PRODUCTS HAVE A WIDE MOLECULAR WEIGHT DISTRIBUTION AND A PRACTICALLY DEVOID OF VERY HIGH MOLECULAR WEIGHT CONSTITUENTS.