Metal Halides in Vinylpyridine Rubber (PBR)

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Abstract
It has been found that PBR is made stronger by the addition of certain metal halides. A kind of cross-linking results, probably by coordination of pyridine nitrogens. This crosslinking can be used as a supplement to that produced by curing with sulfur. The result is improved physical properties in vulcanized products. Gum stocks show higher tensile strength. Filled stocks show higher tensile strength and elongation at 100° C and greater resistance to abrasion and to cut-growth. The system also has the capacity to develop high modulus. Because of this, lesser amounts of filler may be used. The result is a compound which has hysteresis properties like a carcass stock and abrasion resistance like a tread stock. This is an interesting combination of properties, which should fine useful applications.

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