Process for the preparation of branched polymers
AssigneeShell Oil Company
InventorAntonius A. Broekhuis
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Abstract
The invention provides a process for the preparation of a branched polymer which comprises contacting a monovinyl aromatic monomer having from 8 to 18 carbon atoms per molecule with an organolithium initiator, thereafter adding at least one conjugated diene monomer having from 4 to 12 carbon atoms per molecule and thereafter adding a tris-(nonylated phenyl)phosphite as coupling agent in an amount from 0.15 to 1.1 mol per mol of the organolithium initiator.
Claims5
A process for the preparation of a branched polymer which comprises contacting a monovinyl aromatic monomer having from 8 to 18 carbon atoms per molecule with an organolithium initiator, thereafter adding at least one conjugated diene monomer having from 4 to 12 carbon atoms per molecule and thereafter adding a phosphite triester as coupling agent, wherein the phosphite triester is a tri(mixed mono- and dinonyl phenyl) phosphite added in an amount from about 0.15 to 1.1 mole per mol of the organolithium initiator.
Dependencies are inferred from the claim text.