Process for the preparation of polybutadiene with a low...

Details Process for the preparation of polybutadiene with a low... Process for the preparation of polybutadiene with a low...

2006-04-18

2006-04-18

Teskin, Fred (Department: 1713)

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

Synthetic resins

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

C525S232000, C525S387000, C524S572000, C526S164000

Reexamination Certificate

active

07030195

ABSTRACT:
Process for the preparation of polybutadiene with a low branching degree which comprises:(a) a first polymerization step of butadiene in the presence of organic solvents and in the presence of a catalytic system comprising (a1) a derivative of neodymium;(a2) an aluminum alkyl having general formula (I) AlR1R2R3;(a3) an organo aluminum derivative containing at least one halogen atom, preferably chlorine;the above first step being carried out up to a conversion of butadiene >98% to give a linear polybutadiene (gm=1) with a content of 1,4-cis units greater than 93% and a Mw/Mn ranging from 2.2 to 2.9;(b) treatment of the polymeric solution obtained at the end of step (a) with a peroxide,(c) recovery of the polybutadiene with a low branching degree obtained at the end of step (b).

REFERENCES:
patent: 4990573 (1991-02-01), Andreussi et al.
patent: 5567784 (1996-10-01), Wieder et al.
patent: 5681886 (1997-10-01), Fuchs et al.
patent: 0 863 165 (1998-09-01), None
patent: 952021 (1964-03-01), None
patent: WO 03/018649 (2003-03-01), None

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