Process for preparing ethylene-based polymers having low molecul

Details Process for preparing ethylene-based polymers having low molecul Process for preparing ethylene-based polymers having low molecul

1996-10-30

1998-03-17

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526905, 528499, 528500, 528501, 528503, 585512, 585833, C08F 624, C08F 602, C08F 206

Patent

active

057287830

ABSTRACT:
Polymerization process to obtain elastomeric copolymers or terpolymers based on ethylene for cold flow improver (CFI) having a viscosimetric average molecular weight ranging between 600 and 16,000.
a) The process includes polymerizing monomers in suspension in the presence of an alpha-olefin liquid under reaction conditions, in the presence of an amount of solvent from about 5 to 30% by volume of the reactor volume in the presence of a polymerization catalyst able to give the X.sub.2 and/or X.sub.4 parameters, lower less than or equal to 0.02, X.sub.2 and X.sub.4 representing the fraction of uninterrupted methylenic sequences of 2 and 4 methylenic groups between two successive methyl or methylene groups respectively in the polymeric chain, as compared with the uninterrupted total sequences of methylene groups determined by .sup.13 C-NMR;
b) Conveying the reaction slurry into a flash pipe for the evaporation of the unreacted monomers and of minimum quantities of solvent;
c) The polymeric part with the quantity of solvent of the same type or different as above, so as to obtain the desired polymer concentrations, and deactivation of the catalyst by bubbling of wet air stream.

REFERENCES:
patent: 3608611 (1971-09-01), Oshima et al.
patent: 4906329 (1990-03-01), Tominari et al.
patent: 5229477 (1993-07-01), Job et al.
patent: 5326855 (1994-07-01), Kahn
patent: 5374695 (1994-12-01), Tanaglia et al.
Partial European Search Report. EP 96 11 7333. Jun. 26, 1997.

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