Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2008-07-08
2008-07-08
Teskin, Fred M (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S177000, C526S178000, C526S185000, C526S196000, C525S285000, C525S308000, C525S316000, C525S331900, C525S942000
Reexamination Certificate
active
07396887
ABSTRACT:
A process for producing polymers having at least one high vinyl end segment is provided. The process comprises: (a) forming a living prepolymer high vinyl initiator with a vinyl content greater than about 45% using a vinyl modifier, (b) adding a R1R2R3aluminum or R1R2R3boron compound to nullify the effect of the vinyl modifier, and (c) initiating polymerization of diene monomers using said living prepolymer high vinyl initiator so as to form a polymer product with at least one high vinyl end segment, where R1, R2, and R3are selected from the group consisting of C1-C12 alkyl, C2-C12 alkene, C2-C12 alkyne, phenyl, and alkyl-substituted phenyl, and may all be identical or may all be separately selected but cannot be H. The polymers having at least one high vinyl end segment may be coupled to produce a polymer having a high vinyl end segment on all ends.
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Bridgestone Corporation
Hooker Meredith E.
Sheaffer Jenny L.
Teskin Fred M
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