Reduction of isomerization in solution process for polymerizatio

Details Reduction of isomerization in solution process for polymerizatio Reduction of isomerization in solution process for polymerizatio

1986-01-23

1987-10-20

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

524188, 524251, 524428, 528485, 528486, C08F 242, C08F 606, C08F 610

Patent

active

047015047

ABSTRACT:
A solution polymerization process for the preparation of high molecular weight polymers of alpha-olefins selected from the group consisting of homopolymers of ethylene and copolymers of ethylene and C.sub.4 -C.sub.12 alpha-olefins is disclosed. The process comprises feeding monomer(s), coordination catalyst and inert hydrocarbon solvent to a reactor, polymerizing the monomers at a temperature of up to 320.degree. C. and a pressure of less than 25 MPa, and deactivating the catalyst in the solution so obtained. The catalyst is deactivated by sequentially admixing therewith a minor amount of a nitrogenous base, especially an aqueous solution of such a base, followed by a solution of a salt of an alkaline earth metal or zinc and an aliphatic monocarboxylic acid dissolved in hydrocarbon solvent. The ratio of water:nitrogenous base should not be greater than 5. The hydrocarbon solvent and other volatile matter are then separated from the resultant solution and a composition comprising said high molecular weight polymer is recovered. The amount of nitrogenous base plus any water is not more than 2.5 moles per mole of halogen plus alkyl radicals in the coordination catalyst.

REFERENCES:
patent: 2921057 (1960-01-01), Mertzweiler
patent: 3293235 (1966-12-01), Cavender et al.
patent: 3773743 (1973-11-01), Ainsworth, Jr. et al.
patent: 4430488 (1984-02-01), Zboril
patent: 4476297 (1984-10-01), Kablitz et al.

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