Abstract: This invention is directed to a process for preparing copolymers of ethylene with certain alpha olefins and nonconjugated dienes. The novel aspect of this invention relates to a catalyst system comprising a vanadium tetrachloride catalyst in conjunction with a cocatalyst comprising equimolar quantities of ethyl aluminum dichloride and tri-isobutyl aluminum. Isobutyl aluminum dichloride may be substituted for the ethyl aluminum dichloride. The product prepared by this process has a high number average molecular weight and is high in tensile strength when compounded with carbon blacks or mineral fillers and extender oils. Additionally, the polymer of this invention exhibits a rapid cure rate. Since the product further exhibits a narrow molecular weight distribution and low crystallinity, there is a greatly reduced die swell upon extrusion. The combination of the high molecular weight, narrow molecular weight distribution and low crystallinity produce a vulcanized product of low compression set.

Abstract: Synthetic polymer compositions such as polymers and copolymers of ethylene and an alpha-olefin having a tensile strength at yield of less than about 1500 psi, a hardness of less than about 40 units on the Shore D hardness scale, and a tensile strength at 300% elongation of between about 450 to 1200 psi are effective artificial roughage materials when fed to ruminant animals. These synthetic polymer compositions, when ingested by the ruminant, form a loose fibrous mass in the rumen of the animal which enhances rumination. Increasing the rumination results in increasing the consumption of the feed by the animal and thus results in increased production of the animal products.

Abstract: A multilayer composition may be prepared by a process comprising applying an intimately mixed blend of a thermoplastic polyolefin and an elastomer to the surface of an elastomer and bonding said blend to said surface by heating and application of pressure. Thus a film of the intimately mixed blend may be applied to the surface of the elastomer.Also a motor-car door seal can be produced by extruding to the desired profile the intimately mixed blend of thermoplastic polyolefin and elastomer so as to form the base foot and bonding the elastomer seal to the extruded section.