Preparation of propylene polymer

Abstract

Abstract PURPOSE:To obtain the titled polymer having improved original physical properties, and improved molding and processing properties, by carrying out propylene polymerization by a specific three-stage process by the use of a catalyst consisting of a Ti-containing solid catalytic component and an organoaluminum compound. CONSTITUTION:In the first place propylene or it and another olefin are polymerized by the use of a catalyst consisting essentially of a Ti-containing solid catalytic component and an organoaluminum compound in the presence of hydrogen (preferably 0.3-5mol hydrogen concentration), the hydrogen concentration is made 1.5 times as much as that of the first reaction, preferably 3-30mol hydrogen concentration, and the second-stage polymerization is carried out. Hydrogen in the polymerizer is eliminated, feed of hydrogen is stopped, and the third-stage polymerization is carried out in a state free from hydrogen, to give the desired polymer. EFFECT:Causing neither fish eye nor rough surface.

Inventors

• 👤 Kazuhiro Fujiwara
• 👤 藤原　一洋
• 👤 Kazumasa Fujimura
• 👤 和昌 藤村
• 👤 Takao Sakai
• 👤 酒井　孝夫
• 👤 Hideo Sakurai
• 👤 秀雄 桜井

Bibliographic Details