Production of ethylene copolymer

Abstract

Abstract PURPOSE:To obtain a copolymer having a wide MW distribution and excellent enviromental stress cracking resistance, by copolymerizing ethylene with an alpha- olefin in two stages in the presence of a Mg-halogen-Ti/organoaluminum compound catalyst and forming, in each stage, a copolymer having a specified MI and a specified density. CONSTITUTION:Ethylene and an alpha-olefin are copolymerized in two stages in the presence of a catalyst system consisting of (i) a solid component containing Mg, a halogen and Ti (e.g., MgCl9/TiCl4) and (ii) an organoaluminum compound (e.g., triisobutylalminum) to obtain a copolymer, melt index 0.02-30g/10min, densty 0.890-0.935g/cm<3>. Said two stages comprises stage A wherein 80- 20pts.wt. copolymer having a high load melt index of 0.03-10g/10min and a density of 0.890- 0.905g/cm<3> is produced and stage B wherein 20-80pts.wt. copolymer having melt index of 10-5,000g/10min and a density of 0.905-0.940g/cm<3> is produced. The order of stages A and B can be reversed.

Inventors

• 👤 Shintaro Inasawa
• 👤 伸太郎 稲沢
• 👤 Yukinori Susaka
• 👤 須坂　行徳

Bibliographic Details