Process for continuously producing propylene-ethylene block copo

Details Process for continuously producing propylene-ethylene block copo Process for continuously producing propylene-ethylene block copo

1982-08-30

1985-01-08

Briggs, Sr., Wilbert J.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

422132, 422134, 422135, 525 54, 525323, C08G29708

Patent

active

044927878

ABSTRACT:
The present invention relates to a process for producing a polypropylene-ethylene block copolymer by a continuous multi-stage polymerization comprising a first stage in which polypropylene is polymerized in a first polymerization vessel in the presence of a propylene polymerization catalyst, and a second stage in which propylene and ethylene are copolymerized in a second polymerization vessel, wherein the polypropylene slurry discharged from the first polymerization vessel is supplied to a concentrator to separate said slurry into a concentrated polypropylene slurry and a supernatant liquid, the concentrated polypropylene slurry is then introduced through an upper part of a hydraulic sedimentation classifier to be contacted with a countercurrent of the upward flowing of the supernatant fluid introduced through a lower part of said classifier to obtain hydraulically sedimented polypropylene, and non-hydraulically sedimented polypropylene; the thus obtained hydraulically-sedimented polypropylene is then supplied to the second polymerization vessel or to a further propylene polymerization vessel and the non-hydraulically sedimented polypropylene is then recycled from the classifier to the first polymerization vessel. The present process produces a propylene-ethylene block copolymer having excellent characteristics of cold shortness and high impact strength.

REFERENCES:
patent: 3345431 (1967-10-01), Harban
patent: 3454675 (1969-07-01), Scoggin
patent: 3776979 (1973-12-01), Hill
patent: 4291132 (1981-09-01), Clifford
patent: 4380608 (1983-04-01), Hasvo et al.
Yoshioka and Hotta, Kagaku Kogaku, 19, 632, (1955).
D. Bradley, Ind. Chemist, Sep., 473, (1958).

Affiliated with

Also associated with

Rating

Process for continuously producing propylene-ethylene block copo does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for continuously producing propylene-ethylene block copo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for continuously producing propylene-ethylene block copo will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-113706