ETHYLENE PROPYLENE BLOCK COPOLYMER

摘要

PURPOSE: An ethylene-propylene block copolymer is provided to support heavy loads, to be suitable for various fields generating many impacts, and to have high rigidity and impact strength. CONSTITUTION: An ethylene-propylene block copolymer is obtained by polymerizing a propylene homopolymer part and an ethylene propylene copolymer part in stages. The melt index of the ethylene propylene block copolymer is 3-8 g/10min(230°C) and the polydispersity index of the ethylene propylene block copolymer is 5.0-8.0. The content of the ethylene-propylene copolymer is 7.5-12.5 weight% based on the content of the solvent extraction rubber. The ethylene content in the ethylene-propylene copolymer is 30-60 mol% based on the ethylene content in the solvent extraction rubber.