Polyethylene and method of production thereof

Details Polyethylene and method of production thereof Polyethylene and method of production thereof

1994-03-14

1995-05-02

Smith, Edward J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

502155, 526172, 5263483, 5263484, 5263485, 5263486, 526352, 526903, C08F 426, C08F 1002

Patent

active

054120462

ABSTRACT:
A polyethylene, having 1 to 60 methyl branches and 1 to 60 hexyl or higher branches per 1000 carbon atoms, a g-value of 0.5 to 0.8, and a limiting viscosity [.eta.] of 0.005 to 20.0 dl/g as measured at 140.degree. C. in o-dichlorobenzene, and a method for producing the same by polymerizing ethylene using a catalyst system comprising a coordination nickel compound of zero- or two-valent nickel and an aminobis(imino)phosphorane represented by a general formula (I): ##STR1## where R.sub.1, R.sub.2, R.sub.3 and R.sub.4 may be the same as or different from each other and are respectively n-alkyl, isoalkyl, aryl or trialkylsilyl, in the presence of .alpha.-olefin.

REFERENCES:
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patent: 4438243 (1984-03-01), Kashiwa et al.
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patent: 4586995 (1986-05-01), Randall et al.
patent: 4691036 (1987-09-01), Starzewski et al.
patent: 4724273 (1988-02-01), Fink et al.
Keim et al., "Novel Nickel-and Palladium-Complexes with Aminobis(imino)phosphorane Ligands for the Polymerization of Ethylene," Angewandte Chemie, vol. 20, No. 1 (1981).
Alexander et al., Angew. Chem. Int. Ed. Engl., 24, 599-601 (1985).

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