Low pressure copolymerization of ethylene with .alpha.-olefins a

Details Low pressure copolymerization of ethylene with .alpha.-olefins a Low pressure copolymerization of ethylene with .alpha.-olefins a

1990-09-24

1991-12-10

Teskin, Fred

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

Synthetic resins

Treating polymer containing material or treating a solid...

528499, 528500, 528501, 526 68, C08F 600

Patent

active

050719505

ABSTRACT:
Ethylene/.alpha.-olefin copolymers are prepared by catalytic dry-phase copolymerization of the monomers in a stirred or fluidized polymerization zone, transfer of the resulting mixture of solid copolymer and unconverted gaseous monomer into a let-down zone and separation of the mixture, after pressure reduction, into a gaseous phase and a solid phase, by a continuous process in which the solid phase is continuously flushed beforehand with gaseous ethylene and then flushed with a mixture of nitrogen and steam. The ethylene copolymers are very substantially free of residual monomers and odor and flavor substances.

REFERENCES:
patent: 3152872 (1964-10-01), Scoggin et al.
patent: 3488339 (1970-01-01), Carter
patent: 4258158 (1981-03-01), Pfeiffer
patent: 4372758 (1983-02-01), Bobst et al.
patent: 4758654 (1988-07-01), Brod et al.

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