PREPARATION METHOD OF RANDOM COPOLYMERS OF POLYPROPYLENE

摘要

PURPOSE: A polypropylene random copolymer is provided to use the manufacture of an internal pressure pipe for water supply, hot water or heating due to excellent pressure endurance, processability, and impact resistance. CONSTITUTION: A preparation method of a polypropylene random copolymer comprises the steps of: mixing a propylene monomer and an olefin monomer which is not propylene at a weight ratio of 70:30~99:1, respectively; copolymerizing the mixture in a one-stage gas phase reactor; and transferring a product and unreacted material to a two-stage gas phase reactor, mixing a propylene monomer and an olefin monomer which is not propylene as a comonomer in a weight ratio of 80:20 ~ 99.5:0.5, respectively; and copolymerizing the mixture.