Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1974-08-02
1976-09-14
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526157, 526169, 526336, 526350, C08F21018
Patent
active
039806235
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.
REFERENCES:
patent: 3205216 (1965-09-01), McManimie et al.
patent: 3478002 (1969-11-01), Nakaguchi et al.
patent: 3803113 (1974-04-01), Gluntz et al.
Staib John H.
Wagensommer Joseph
Exxon Research and Engineering Company
Lagani A.
Mahon John J.
Schofer Joseph L.
Tungol Maria S.
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