US 12,103,995 B2
Method of controlling polyethylene architecture
Jorge Manuel Jardim da Silva, São Paulo (BR); Hadi Mohammadi, Philadelphia, PA (US); Kevin Herrington, Philadelphia, PA (US); Manoela Ellwanger Cangussu, São Paulo (BR); Nei Sebastião Domingues Junior, São Paulo (BR); and Adriane Gomes Simanke, São Paulo (BR)
Assigned to Braskem S.A., Camaçari (BR)
Filed by Braskem S.A., Camaçari (BR)
Filed on Apr. 7, 2022, as Appl. No. 17/715,678.
Claims priority of provisional application 63/171,827, filed on Apr. 7, 2021.
Prior Publication US 2022/0325019 A1, Oct. 13, 2022
Int. Cl. C08F 210/02 (2006.01); C08F 2/38 (2006.01); C08F 218/10 (2006.01)
CPC C08F 218/10 (2013.01) [C08F 2/38 (2013.01); C08F 210/02 (2013.01); C08F 2500/07 (2013.01); C08F 2500/08 (2013.01); C08F 2500/09 (2013.01); C08F 2500/17 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method of controlling long chain branching in an ethylene-based polymer, comprising:
polymerizing ethylene with one or more optional monomers to form the ethylene-based polymer; and
controlling a degree of long chain branching (LCB) in the ethylene-based polymer to a range from 0.1 per 1000 carbon atoms in a polymer backbone to 10 per 1000 carbon atoms in the polymer backbone, as measured by 13CNMR, by adding one or more branched vinyl ester to the polymerizing in an amount ranging from 0.01 mol % to 5.0 mol %, relative to total monomer content,
wherein the ethylene-based polymer has a zero-shear viscosity (η0) at 150° C. ranging from 10 Pa·s to 5×106 Pa·s.