US 9,809,661 B2
Process for continuous synthesis of a diene elastomer
Jerome Dussillols, Clermont-Ferrand (FR); Pierre Kiener, Clermont-Ferrand (FR); and Helene Parola, Clermont-Ferrand (FR)
Assigned to COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, Clermont-Ferrand (FR); and MICHELIN RECHERCHE ET TECHNIQUE S.A., Granges-Paccot (CH)
Appl. No. 14/411,725
Filed by COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, Clermont-Ferrand (FR); and MICHELIN RECHERCHE ET TECHNIQUE, S.A., Granges-Paccot (CH)
PCT Filed Jul. 1, 2013, PCT No. PCT/EP2013/063864
§ 371(c)(1), (2) Date Dec. 29, 2014,
PCT Pub. No. WO2014/006007, PCT Pub. Date Jan. 9, 2014.
Claims priority of application No. 12 56328 (FR), filed on Jul. 2, 2012.
Prior Publication US 2015/0158960 A1, Jun. 11, 2015
Int. Cl. C08F 36/04 (2006.01); C08F 36/08 (2006.01); C08F 2/01 (2006.01); B01J 19/00 (2006.01); B01J 19/18 (2006.01)
CPC C08F 36/08 (2013.01) [B01J 19/0066 (2013.01); B01J 19/18 (2013.01); C08F 36/04 (2013.01); B01J 2219/00761 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A process for the continuous synthesis of a diene elastomer, comprising, simultaneously:
a) introducing continuously into a polymerisation reactor containing a gas phase and equipped with at least one stirring rotor and a discharge device, at least
i. one or more monomer(s) to be polymerised, including at least one conjugated diene monomer, and
ii. from 0% to 70% by mass of an organic solvent, calculated relative to the total mass of monomer(s) and of solvent
b) continuously polymerising the monomer(s),
c) stirring a polymerisation medium via the continuous movement of at least one stirring rotor about a rotary axle,
d) continuously discharging an elastomer paste derived from the polymerisation,
e) continuously conveying the discharged elastomer paste to a chopping device and chopping it into particles,
f) removing the solvent from the particles of the elastomer paste and
g) recovering the diene elastomer of the particles obtained in the preceding step; wherein
(1) the process has a degree of conversion of at least 60%, at the limit of the first third of the reaction volume of the polymerisation reactor, and
(2) the process has a residence time distribution function in the polymerisation reactor having a standard deviation that is greater than the mean residence time divided by 2√3.