PROCESS FOR PRODUCING PROPYLENE - ETHYLENE COPOLYMERS

摘要

Propylene-ehtylene copolymer was prepd. by three stages. A deformed polypropylene(contg. 5-20 wt % ethylene) was prepared by copolymg. propylene and ethylene with a stereotype catalyst at first. Propylene-ethylene copolymer A(contg. ethylene 50-95 wt.% and having max. viscosity >=12 dl/g) was prepd. at second. Copolymer B(contg. ethylene 40-90wt.% and having max. viscosity<=9.5 dl/g) was prepd. at third. Thus, dimethyl aluminiummonochloride 8g and 3-chloride titanium 4g was addedto dried n-hexane 20l in the polymn. reactor. Propyene was added in the reactor and kept at 10kg/cm2G and 70≦̸C. Then ethylene and propylene gases mixed and copolymd.