Nippon Zeon Company, Ltd.

Zeon Corporation

Zeon Chemicals Usa, Inc.

Vernon L Kyllingstad

Shakti L Mukerjee

Ronald J Schaefer

Ring-opening metathesis polymerization (ROMP) of cyclo-olefins with molybdenum catalysts

Ruthenium catalysts for metathesis reactions of olefins

Penta-coordinated ruthenium or osmium catalysts for metathesis reactions of olefins, which are cationic complexes represented by formulas I, II or III:

Ruthenium or osmium catalysts for olefin metathesis reactions

A curable halobutyl rubber/polyepihalohydrin rubber blend comprises a cure system consisting essentially of (a) sulfur, (b) sulfur accelerator, (c) zinc-containing promoter, (d) urea or urea derivative vulcanization accelerator and, optionally, (e) di- or tri-mercapto nonsulfur curative such as 2,4,6-trimercapto-1,3,5-triazine. The halobutyl rubber/polyepi-halohydrin rubber blends that are crosslinked with the cure system of this invention exhibit excellent scorch safety and cure rate, as well as a high degree of crosslinking, and are useful in the manufacture of tire inner tubes and inner liners.

Curable halobutyl rubber/poly-epihalohydrin rubber blends

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Floyds Knobs, IN, United States of America

Vernon L Kyllingstad