US 11,718,692 B2
Copolymer of ethylene and a 1,3-diene
Vincent Lafaquiere, Clermont-Ferrand (FR); and Emma Moreso, Clermont-Ferrand (FR)
Assigned to COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, Clermont-Ferrand (FR)
Appl. No. 16/981,804
Filed by COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, Clermont-Ferrand (FR)
PCT Filed Mar. 18, 2019, PCT No. PCT/FR2019/050598
§ 371(c)(1), (2) Date Sep. 17, 2020,
PCT Pub. No. WO2019/180356, PCT Pub. Date Sep. 26, 2019.
Claims priority of application No. 1852305 (FR), filed on Mar. 19, 2018.
Prior Publication US 2021/0054118 A1, Feb. 25, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C08F 210/16 (2006.01); C08L 23/08 (2006.01); B60C 1/00 (2006.01); C08F 210/02 (2006.01); C08F 236/04 (2006.01); C08K 5/00 (2006.01)
CPC C08F 210/02 (2013.01) [B60C 1/00 (2013.01); C08K 5/0025 (2013.01); C08F 210/16 (2013.01); C08F 236/045 (2013.01); C08F 2420/00 (2013.01); C08L 23/083 (2013.01)] 19 Claims
 
1. A process for the preparation of a copolymer of ethylene and of a 1,3-diene of formula (I) which comprises ethylene units and units of the 1,3-diene, the ethylene units representing between 50 mol % and 95 mol % of the ethylene units and of the units of the 1,3-diene, and the units of the 1,3-diene of 1,2 and 3,4 configuration representing more than 50 mol % of the units of the 1,3-diene,
CH2=CR−CH=CH2  (I)
the symbol R representing a hydrocarbon chain having from 3 to 20 carbon atoms, wherein the process comprises the polymerization of ethylene and of the 1,3-diene in the presence of a catalytic system based at least on a metallocene of formula (II) and on an organomagnesium compound of formula (III)
P(Cp1Cp2)Nd(BH4)(1-y)-Ly-Nx  (II)
MgR1R2  (III)
Cp1 and Cp2, which are identical or different, being selected from the group consisting of substituted fluorenyl groups and the unsubstituted fluorenyl group of formula C13H8,
P being a group bridging the two Cp1 and Cp2 groups and representing a ZR3R4 group, Z representing a silicon or carbon atom, R3 and R4, which are identical or different, each representing an alkyl group comprising from 1 to 20 carbon atoms,
y, which is an integer, being equal to or greater than 0,
x, which is or is not an integer, being equal to or greater than 0,
L representing an alkali metal selected from the group consisting of lithium, sodium and potassium,
N representing a molecule of an ether,
R1 and R2, which are identical or different, representing a carbon group.