Patent ID: 11859039
Assignee: CARIFLEX PTE. LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 5:
6. A process for preparing a branched polymer, the process comprising:
(i) polymerizing isoprene at a temperature from 0° C. to 100° C., to form a polymer block C;
(ii) adding a multifunctional coupling agent of formula (R1O)3Si—Y—Si(OR2)3; and
forming a branched polyisoprene homopolymer having a formula (C)m(R1O)3-mSi—Y—Si(R2O)3-n(C)n from steps (i) and (ii); wherein
each C block is a polyisoprene block;
each C block independently has a weight average molecular weight from 400-1000 kg/mol;
R1 and R2 are independently H, or C1-C6 alkyl groups;
Y is a C2-C8 alkylene group;
m and n are integers independently having values from 1-3; and
the branched polymer has a coupling efficiency (CE) of at least 40%.