Catalyst impregnated on fine silica, process for preparing, and use for ethylene polymerization

US4521573A · kind A · utility

Assignee

• UNION CARBIDE CORPORATION · US

Inventors

• Kiu H. Lee · South Charleston, US
• Gary S. Cieloszyk · Somerville, US

Key dates

• Filing date: Jul 25, 1983
• Grant date: Jun 4, 1985
• Expiry date: Jul 25, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/909
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Film grade ethylene copolymers are prepared by copolymerizing ethylene with at least one C.sub.3 to C.sub.8 alpha olefin employing a catalyst formed from an organo aluminum activator compound and a precursor composition impregnated in very fine particle sized porous silica, said precursor composition having the formula EQU MG.sub.m Ti.sub.1 (OR).sub.n X.sub.p [ED.sub.q ] wherein R is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical; X is selected from the group consisting of Cl, Br, I or mixtures thereof; ED is an electron donor compound; m is .gtoreq.0.5 to .ltoreq.56; n is 0, 1 or 2; p is .gtoreq.2 to .ltoreq.116; and q is .gtoreq.2 to .ltoreq.85; and said organo aluminum activator compound having the formula EQU Al(R").sub.c X'.sub.d H.sub.e wherein X' is Cl or OR'"; R" and R'" are the same or different and are C.sub.1 to C.sub.14 saturated hydrocarbon radicals; d is 0 to 1.5; e is 1 or 0; and c+d+e=3.