Abstract:
A process for polymerizing ethylene in the presence of a polymerization catalyst by copolymerizing ethylene with a comonomer selected from the group of C4-C10 alpha-olefins in three polymerization stages. The polymers produced in the three stages have different melt flow rates. The polymer composition produced by the process has good mechanical properties and can be used for making pipes. The process has a good productivity and provides a stable and economic operation.
Abstract:
A polymer composition comprising: (C) at least 80 wt % of a multimodal high density polyethylene having a density of 940 kg/m3 or more; and (D) 1 to 14 wt % of a cyclic ethylene copolymer or cyclic propylene copolymer.
Abstract translation:一种聚合物组合物,其包含:(C)至少80重量%的密度为940kg / m 3或更高的多峰高密度聚乙烯; 和(D)1〜14重量%的环状乙烯共聚物或环状丙烯共聚物。
Abstract:
The present invention provides a process of producing a modified polymer composition, which composition comprises a free-radical polymeriseable monomer grafted to a polyolefin backbone. The process comprises contacting, in an extruder, an olefin polymer and the free-radical polymeriseable monomer in the presence of a stable radical in an extruder and extruding the composition.