Continuous production of ethylene homopolymers

Abstract

Abstract PRODUCTION OF ETHYLENE HOMOPOLYMERS HAVING A SPECIFIC DENSITY BY POLYMERIZATION OF ETHYLENE UNDER THE ACTION OF ORGANIC PEROXIDES AND OXYGEN AS FREE-RADICAL-GENERATING POLYMERIZATION INITIATORS AND OF POLYMERIZATION MODIFIERS AT ELEVATED TEMPERATURE AND SUPERATMOSPHERIC PRESSURE IN A TUBULAR 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. OXYGEN AS POLYMERIZATION INITIATOR AND A MIXTURE OF A POLYMERIZATION MODIFIER HAVING A SPECIFIC RELATIVELY LOW C5 VALUE AND A POLYMERIZATION MODIFIER HAVING A SPECIFIC RELATIVELY HIGH C5 VALUE ARE USED IN THE FIRST REACTION ZONE, AND AN ORGANIC PEROZIDE HAVING A SPECIFIC HALF VALUE TEMPERATURE AS POLYMERIZATION INITIATOR AND A MIXTURE OF A POLYMERIZATION MODIFIER HAVING A SPECIFIC RELATIVELY LOW C5 VALUE AND A POLYMERIZATION MODIFIER HAVING A SPECIFIC RELATIVELY HIGH POLYMERIZATION MODIFIER HAVING A SPECIFIC RELATIVELY HIGH C5 VALUE ARE EMPLOYED IN THE SECOND REACTION ZONE. THE ETHYLENE HOMOPOLYMERS OBTAINED HAVE A WIDE MOLECULAR WEIGHT DISTRIBUTION AND ARE PRACTICALLY DEVOID OF VERY HIGH MOLECULAR WEIGHT CONSTITUENTS.

Inventors

• 👤 Klaus Steigerwald
• 👤 Oskar Buechner
• 👤 Friedrich Urban
• 👤 Helmut Pfannmueller

Bibliographic Details