Ronald J Schaefer

US Patent:

53859804, Jan 31, 1995

Filed:

Mar 22, 1994

Appl. No.:

8/216243

Inventors:

Ronald J. Schaefer - Medina OH
Vernon L. Kyllingstad - Floyds Knobs IN

Assignee:

Zeon Chemicals U.S.A., Inc. - Louisville KY

International Classification:

C08L 1502
C08L 900
C08L 2328
C08L 7103

US Classification:

525187

Abstract:

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.