PURPOSE: To obtain the titled polymer having improved original physical properties, and improved molding and processing properties, by carrying out propylene polymerization by a sepcific three-stage process by the use of a catalyst consisting of a Ti-containing solid catalytic component and an organoaluminum compound.
CONSTITUTION: Propylene or it and another olefin are polymerized by three stages by the use of a catalytic system consisting essentially of a Ti-containing solid catalytic component and an organoaluminum compound. After the first- stage polymerization is carried out in the presence of hydrogen, hydrogen in the polymerizer is eliminated, the feed of hydrogen is stopped, the second-stage polymerization is carried out in a stage free from hydrogen, hydrogen is refed, and the third-stage polymerization is carried out in the presence of hydrogen, to give the desired copolymer. EEFECT:Causing no trouble such as occurrence of fish eye, rough surface, etc.
FUJIMURA KAZUMASA
SAKAI TAKAO
SAKURAI HIDEO
| JPS5516048A | 1980-02-04 | |||
| JPS54139693A | 1979-10-30 | |||
| JPS5734112A | 1982-02-24 |