Polyethylene and process of production thereof

Details Polyethylene and process of production thereof Polyethylene and process of production thereof

1992-09-10

1994-06-28

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526161, 526352, C08F 470, C08F 1002

Patent

active

053247990

ABSTRACT:
Polyethylene having from 1 to 60 methyl branches and from 1 to 60 hexyl or higher branches per 1,000 carbon atoms, a g-value of from 0.5 to 0.9, a limiting viscosity [.eta.] of from 0.005 to 20.0 dl/g as measured at 140.degree. C. in o-dichlorobenzene, a molecular weight distribution not larger than 3 as determined by gel-permeation chromatography (GPC), and not more than 0.2 of terminal double bond in 1,000 carbon atoms, and process for producing the same, comprising polymerizing ethylene in the presence of a catalyst composed of a coordination nickel compound of bivalent nickel, an organoaluminum compound, and an amino-bis(imino)-phosphorane represented by the general formula (I) below: ##STR1## where R.sub.1, R.sub.2, R.sub.3, and R.sub.4 may be the same or different mutually and are respectively n-alkyl, isoalkyl, aryl, or trialdylsilyl.

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W. Keim et al., "Novel Nickel- and Palladium-complexes with aminobis (imino) phosphorane ligands for the polymerization of ethylene," Angewandte Chemie, vo. 20, No. 1, 1981.
U.S. patent application 07/685,608 filed on Apr. 15, 1991, Soga et al., Process for Producing Polyolefin.
U.S. patent application 07/794,606 filed on Nov. 15, 1991, Yano et al., Polyethylene and method of producing thereof.

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