Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1996-10-16
1998-04-21
Ivy, C. Warren
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568613, C07C 4311
Patent
active
057419469
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: 4568775 (1986-02-01), Aoshima et al.
patent: 5416240 (1995-05-01), Weyer et al.
Ivy C. Warren
Keen Malcolm D.
Mobil Oil Corporation
Smith Lyman H.
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