Patent ID: 11952481
Assignee: BOREALIS AG
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 10:
11. The process according to claim 10, wherein the single-site catalyst comprises (i) a complex formula (I):, wherein
M is zirconium or hafnium;
each X independently is a sigma-donor ligand
L is a divalent bridge selected from —R′2C—, —R′2C—CR′2—, —R′2Si—, —R′2Si—SiR′2—, —R′2Ge—, wherein each R′ is independently a hydrogen atom or a C1-C20-hydrocarbyl group optionally containing one or more heteroatoms of Group 14-16 of the periodic table or fluorine atoms, or optionally two R′ groups taken together can form a ring;
R1 and R1′ are each independently hydrogen, C5-C10-aryl or a group —CH(Rx)2 wherein each Rx is independently H or a C1-10 hydrocarbyl group, and optionally the two Rx taken together can form a ring,
R2 and R2′ are each independently hydrogen, C5-C10-aryl or a group —C(Ry)3 
wherein each Ry is independently H or a C1-10 hydrocarbyl group, or optionally two or three Ry groups taken together can form a ring,
whereby at least one of R1 or R2 and one of R1′ or R2′ is different from hydrogen and
whereby R2 together with one of R1, as well as R2′ together with one of R1′ can be part of a further mono- or multicyclic ring condensed to the phenyl ring, R3 and R3′ are each independently a linear C1 to C6 hydrocarbyl group or a branched or cyclic C4 to C10 hydrocarbyl group, whereby the groups are not branched in α-position
R4 and R4′ are each independently a tertiary C4 to C10 hydrocarbyl group
R5 and R5′ are each independently a linear or branched C1 to C10 alkyl group or an C5-C10-aryl group and
(ii) a cocatalyst comprising a compound of a group 13 metal.