| 摘要 |
PURPOSE:To provide the titled copolymer constituted by ethylene unit, a small amount of specific comonomer unit and others, having each specific density and melt index, useful for electrical insulation materials, expansion materials, modification of polymers such as engineering plastics. CONSTITUTION:The objective copolymer with a density 0.860-0.970g/cm<3> and a melt index 0.05-100g/10min made up of (A) 85.0-99.995% of ethylene unit, (B) 0.005-5 (pref. 0.01-2) mol% of comonomer unit of formula (R1 and R2 are each H, Cl or 1-4C alkhl) (pref. 1,1'-diphenylethylene) and (C) 0-10 (pref. 0-5) mol% of an ethylenic unsaturated monomer unit (e.g., butene-1, styrene). This copolymer can preferably be obtained by high-pressure radical polymerization at 50-400 deg.C under a pressure of 500-4,000kg/cm<2>. |
