Telechelic alkadiene polymers with crosslinkable end groups...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...

Reexamination Certificate

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C526S269000, C526S270000, C526S276000, C526S333000, C526S336000, C526S339000, C526S308000, C526S319000, C526S329000, C526S171000

Reexamination Certificate

active

07022789

ABSTRACT:
The present invention relates to telechelic polymers having crosslinkable end groups of the formulaand methods for preparing the same wherein n is an integer;is an alkadienyl group; Y is an alkyl group; and Z is crosslinkable end group. In general, the inventive synthesis involves reacting a functionalized chain transfer agent having crosslinkable ends with a cycloalkene in the presence of a ruthenium or osmium catalyst of the formulawherein:M is ruthenium or osmium;X and X1are independently any anionic ligand;L and L1are any neutral electron donor ligand;R and R1are each hydrogen or a substituted or unsubstituted substituent wherein the substituent is selected from the group consisting of C1–C20alkyl, C2–C20alkenyl, C2–C20alkynyl, aryl, C1–C20carboxylate, C1–C20alkoxy, C1–C20alkenyloxy, C2–C20alkynyloxy, aryloxy, C2–C20alkoxycarbonyl, C1–C20alkylthio, C1–C20alkylsulfonyl and C1–C20alkylsulfinyl. In another aspect of the invention, methods for controlling the molecular weight of the resulting telechelic polymer are also presented.

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