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AssigneeChina Petrochemical Corporation
InventorsXingying Zhang, Guantai Jin, Suhe Zhao
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This invention relates to a multifunctional organic alkali metal initiator for the preparation of various kinds of star polymers by anionic polymerization, a process for making the initiator, a process using said initiator for making star polymers and the polymers obtained. The initiator can be represented by the formula: M.sub.a (RMe).sub.b, wherein M is selected from Sn, Ti, Al, Si and/or B; R is a hydrocarbyl group containing 8-100 carbon atoms, a=1-3, b=2.5-6.5, Me is an alkali metal which may be selected from Na and Li. The initiator was synthesized by reacting an organic alkali metal with a conjugated diene and/or a mono-olefin monomer, and then adding hetero-atom containing halide. The star polymer obtained has a radial molecular structure consisting of several macromolecular chain arms radiating from the initiator core, and its molecular weight distribution expressed by GPC presents a uniform singlet.
An initiator for preparing star polymers in an anionic polymerization, said initiator having the formula:
A polymerized product prepared by carrying out an anionic solution polymerization reaction of monoolefin or diene monomers and, optionally, acrylic monomers in the presence of a multifunctional organic alkali metal initiator so that the polymerized product consists essentially of a plurality of star polymers each having a radial molecular structure consisting of a plurality of macromolecular chain arms formed from the reaction and radiating from an initiator core, wherein said initiator is a multifunctional organic alkali metal initiator having the formula M.sub.a (RMe).sub.b, M is an element selected from the group consisting of Sn, Ti, Al, Si and B, R, is a hydrocarbyl group having 8 to 100 carbon atoms;
A process for preparing a star polymer comprising:
Dependencies are inferred from the claim text.