Patent GB-873225-A (GB)
Title: Improvements in or relating to olefine polymerisation processes
Inventor: DE FRANCISCUS JOHANNES FREDERI
IPC: C08F2/00
Filed: 1956-12-04
Abstract: Olefins are polymerized with the aid of a Ziegler catalyst in the presence of a solvent, under conditions in which an oxygen-containing compound of a metal of Group 1-4 of the Periodic Table, containing in its molecular structure an organic radical having a carbon atom attached to the metal through a single oxygen atom but no direct metal-carbon linkage, is added to the Ziegler catalyst which is supplied to said reaction medium, or is added to said reaction medium itself.  The Ziegler catalyst comprises the proproduct obtained by mixing a tetravalent compound of a metal of Group 4a (having no carbon atom attached to the metal through an oxygen linkage) with either an aluminium trialkyl or triaryl or an aluminium compound of the general formula R1R2AlX, wherein R1 and R2 are similar or dissimilar and each represents a hydrocarbon radical, and X represents a hydrogen atom or a halogen atom.  The olefin may be ethylene or another a -olefin and two or more such olefins may be copolymerized.  The oxygen-containing compound may be an alkoxide or aryloxide and may contain also other radicals such as hydrogen or halogen attached to the metal.  Examples are methoxides, ethoxides, propoxides, butoxides, octoxides, nonoxides, lauroxides and phenoxides of Na, Li, K, Th, Hf, Zr, Al and Ti.  An alcohol may also be added to the catalyst composition and this may or may not correspond to that of the oxygen-containing compound.  The Ziegler catalyst components may be titanium tetrachloride, aluminium triethyl and aluminium diethyl chloride.  The solvent may be benzene or isooctane and the olefin, catalyst, oxygen-containing compound and solvent may be continuously added.  Specifications 799,392, 799,823, 801,031, 810,023, 816,234, 819,867, 820,263 and 824,374 are referred to.ALSO:A catalyst for the polymerization of olefins comprises a Ziegler catalyst which is used in the presence of a solvent and an oxygen-containing compound of a metal of Group 1 to 4 of the Periodic Table containing in its molecular structure an organic radical having a carbon atom attached to the metal through a single oxygen atom but no direct metal-carbon linkage.  The Ziegler catalyst comprises the product obtained by mixing a tetravalent compound of a metal of Group 4A (having no carbon atom attached to the metal through an oxygen linkage), e.g. TiCl4, with an aluminium trialkyl or triaryl, e.g. triethyl, or an aluminium compound of the type represented by the formula R1R2Alx wherein R1 and R2 are similar or dissimilar hydrocarbon radicals and X is hydrogen or halogen, e.g. aluminium diethyl chloride.  The oxygen-containing compound may be an alkoxide or aryloxide and may contain also other radicals such as hydrogen or halogen attached to the metal.  Examples are methoxides, ethoxides, proproxides, butoxides, octoxides, nonoxides, lauroxides and phenoxides of Na, Li, K, Th, Hf, Zr, Al and Ti.  An alcohol may also be added to the catalyst composition and may or may not correspond to that of the oxygen-containing compound.  The solvent may be benzene or isooctane. Specifications 799,392, 799,823, 801,031, 810,023, 816,234, 819,867, 820,263 and 824,374 are referred to.