Polyether lubricants and method for their production

Details Polyether lubricants and method for their production Polyether lubricants and method for their production

1994-10-27

1997-07-15

Evans, Joseph E.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568621, 508579, C07C 4311, C10M10508

Patent

active

056485573

ABSTRACT:
Cyclic ethers are polymerized or copolymerized in homogeneous liquid phase using very low concentrations of heteropolyacid catalyst to produce essentially linear polyoxyalkylene polymers. The product of the polymerization contains less than 2 weight percent cyclic oligomer by-product and has a molecular weight distribution (M.sub.w /M.sub.n) between 1 and 2. Alcohols, acyl-containing compounds and alkalies can be used as end-caping groups to terminate polymerization or modify the properties of the polymer produced. The process produces novel polyoxyalkylene copolymers and block copolymers that are useful as lubricants. The copolymers have a high viscosity index and are compatible with mineral oil and synthetic hydrocarbon lubricants. Preferred comonomers are tetrahydrofuran, C.sub.2 -C.sub.20 monoepoxides and oxetan.

REFERENCES:
patent: 3454652 (1969-07-01), Dunlop et al.
patent: 4245004 (1981-01-01), Login et al.
patent: 4568775 (1986-02-01), Aoshima et al.
patent: 5099074 (1992-03-01), Mueller et al.
patent: 5414143 (1995-05-01), Weyer et al.
patent: 5416240 (1995-05-01), Weyer et al.

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