Controlled comonomer distribution along a reactor for...

Details Controlled comonomer distribution along a reactor for... Controlled comonomer distribution along a reactor for...

2006-05-30

2006-05-30

Teskin, Fred (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S064000, C526S087000, C526S901000

Reexamination Certificate

active

07053163

ABSTRACT:
The tendency of copolymer fluff grains of propylene and ethylene to agglomerate is reduced by injecting at least one olefin comonomer, such as ethylene monomer, into more than one point along the length of the reactor, rather than injecting all of the ethylene at one point. This process reduces the tendency of copolymer fluff grains to agglomerate and cause processing problems as compared with injecting the comonomer at only one point. Copolymer made by this process is expected to have lower substantially amorphous polypropylene content and better organoleptics than copolymer made where the ethylene is injected at only one point. In one non-limiting embodiment the copolymerization reactor is a loop-type reactor.

REFERENCES:
patent: 3546189 (1970-12-01), Ebster
patent: 6727332 (2004-04-01), Demain
patent: 2003/0114608 (2003-06-01), Tharappel et al.
patent: 2004/0116625 (2004-06-01), Hottovy et al.

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