NEW ZIEGLER-NATTA CATALYST COMPOSITION

• Main Authors: HINGMANN ROLAND DR, SPAETHER WOLF, HUEFFER STEPHAN DR, TREFFKORN INGO, HEMMERICH RAINER DR, LYNCH JOHN, SCHWEIER GUNTHER, SEGUL ALEXANDRE, BIDELL WOLFGANG DR, ROESCH JOACHIM DR
• Format: Patent
• Language: English
• Published: 11.09.2001
• Edition: 7
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; NATURAL OR ARTIFICIAL THREADS OR FIBRES; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SPINNING; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP; THEIR RELEVANT APPARATUS; TRANSPORTING; WORKING-UP

PROBLEM TO BE SOLVED: To develop a Ziegler-Natta catalyst composition capable of producing a film reduced in the tendency to form microspecks and a fiber reduced in troublesome contamination and capable of prolonging the operable life of a filtration screen for a polymer melt. SOLUTION: There is provided is a Ziegler-Natta catalyst composition containing (a) a solid component containing a titanium or vanadium compound and a magnesium compound as active components, a microparticulate inorganic oxide as a support, and an inner electron-donating compound; (b) an aluminum compound as a cocatalyst; and optionally (c) another external electron-donating compound, wherein the microparticulate inorganic oxide used has a specific surface area of 350-1,000 m2/g and a mean particle diameter D in the range of 5-60 μm and is composed of primary particles having a mean particle diameter d in the range of 1-10 μm, voids or grooves are contained in each primary particle, the macroscopic rate of voids or grooves having a diameter larger than 1 μm in the microparticulate inorganic oxide is 5-30 vol.%, and the molar ratio of the magnesium compound to the microparticulate inorganic oxide is in the range of 0.5:1 to 2.0:1.