Production of ethylene copolymer

Abstract

Abstract PURPOSE:To obtain a copolymer having a wide MW distribution and excellent environmental stress cracking resistance, by copolymerizing ethylene and an alpha- olefin 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:In stage A, ethylene and propylene and/or butene-1 are copolymerized in the presence of a catalyst consisting of a solid component containing at least Mg, a halogen and Ti and an organoaluminum compound to form 80-20pts.wt. copolymer, high load melt index 0.03-10g/10min, density 0.890- 0.935g/cm<3> and, in stage B, ethylene and a 12C or lower alpha-olefin mixture containing above 30mol%5-12C alpha-olefin are copolymerized to form 20-80pts.wt. copolymer, melt index 10-5,000g/10min, density 0.890-0.940g/cm<3>, whereby a copolymer, melt index 0.02-30g/10min, density 0.890-0.935g/cm<3> is obtained. 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