Process for the in situ blending of polymers

Patent · Tue Jun 30 04:00:00 EDT 1992

OSTI ID:6997463

Lee, K H; Karol, F J; Samuels, S B

This patent describes a process for the in situ blending of polymers comprising continuously contacting, under polymerization conditions, a mixture of ethylene and one or more alpha-olefin having at least 3 carbon atoms in at least two fluidized bed reactors connected in series. It comprises a silica supported complex consisting essentially of magnesium, titanium, a halogen, and an electron donor; at least on activator compound for the complex having the formula A1R {double prime} {sub 3}X{prime}{sub f}H{sub g}; a hydrocarbyl aluminum cocatalyst; the mixture of a high melt index copolymer of ethylene and active catalyst formed in one reactor in the series is transferred to an immediately succeeding reactor in the series in which low melt index polymer is made; in a reactor in which the low melt index copolymer is made; the alpha-olefin is present in a ratio of about 0.1 to about 3.5 moles of alpha-olefin per mole of ethylene; and hydrogen is optionally present in a ratio of about 0.001 to about 0.5 mole of hydrogen per mole of combined ethylene and alpha-olefin; additional hydrocarbyl aluminum cocatalyst is added.

• Assignee: Union Carbide Chemicals and Plastics Technology Corp., Danbury, CT (United States)
• Patent Number(s): A; US 5126398
• Application Number: PPN: US 7-724804
• OSTI ID: 6997463
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPLEXES
ALKENES
ALUMINIUM
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMICAL REACTORS
COMPLEXES
COPOLYMERS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ETHYLENE
FERMIONS
FLUIDIZED BEDS
HALOGENS
HYDROCARBONS
HYDROGEN
LEPTONS
MAGNESIUM COMPLEXES
MELTING
METALS
MIXING
NONMETALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POLYMERIZATION
POLYMERS
POLYOLEFINS
SILICON COMPOUNDS
SILICON OXIDES
TITANIUM COMPLEXES
TRANSITION ELEMENT COMPLEXES