Methods for forming amorphous ultra-high molecular weight polyal

Details Methods for forming amorphous ultra-high molecular weight polyal Methods for forming amorphous ultra-high molecular weight polyal

1999-09-15

2000-12-19

Johnson, Jerry D.

Solid anti-friction devices, materials therefor, lubricant or se

Lubricants or separants for moving solid surfaces and...

Solid hydrocarbon polymer

526122, 5261243, 5261251, 5261257, 526135, 5263482, 5263483, 208 14, 585 10, C10M14300, C08F 444

Patent

active

061627739

ABSTRACT:
A composition including polyalphaolefins that function as drag reducing agents and a process for the preparation of polyalphaolefins that function as drag reducing agents are disclosed. The process includes contacting alpha olefin monomers with a catalyst system, which includes a catalyst and an activator (co-catalyst) in a reactant mixture. The catalyst is a transition metal catalyst, preferably titanium trichloride, and the co-catalyst may include an alkylaluminoxane, alone or in combination, with a dialkylaluminum halide or a halohydrocarbon. The polymerization of the alpha olefin monomers produces a non-crystalline, ultra-high molecular weight polyalphaolefin having an inherent viscosity of at least 10 dL/g. The addition of the alkylaluminoxane during the polymerization process provides for a non-crystalline, ultra-high molecular weight polyalphaolefin and a more uniform molecular weight distribution of the resulting polyalphaolefin, thereby creating a drag reducing agent superior to known drag reducing agents. A process for forming a drag reducing agent comprising a non-crystalline, ultra-high molecular weight polyalphaolefin having an inherent viscosity of about at least 10 dL/g and a process for reducing drag in a conduit are also disclosed.

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patent: 5504132 (1996-04-01), Smith et al.
patent: 5869570 (1999-02-01), Eaton et al.
patent: 6015779 (2000-01-01), Eaton et al.

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