POLYMERIZATION CATALYST FOR PRODUCTION OF POLYETHYLENE WITH BROAD MOLECULAR WEIGHT DISTRIBUTION AND ITS PREPARATION METHOD

• Main Authors: KIM, MYOUNG-UN, KIM, JIN-DONG, NA, YONG-HWAN
• Format: Patent
• Language: English; French; German
• Published: 21.12.2011
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR PREPARATION OR CHEMICAL WORKING-UP; THEIR RELEVANT APPARATUS; TRANSPORTING

The present invention is related to a method of manufacture of silicaimpregnated polymerization catalysts with which ethylene having a broad molecular weight distribution singly or alpha-olefin copolymers may be manufactured. In more detail, the present invention is for the manufacture of new, polyolefin polymerization catalysts offering olefin polymers having a broad molecular weight distribution (melt flow ratio, MFR, MFI/MI > 30), not obtained from the conventional Ziegler-Natta catalysts, and of polymerization catalysts having new formulation and composition obtained according to the above method of manufacture. In the present invention, specific components of Ziegler-Natta catalysts are impregnated in a specific order successively on a silica support, with which polyethylene having a molecular weight distribution of 40 to 50 usually based on the melt flow ratio (MFI/MI) can be manufactured, and activated.