Triblock polyalkylene glycols for two phase lubricants
AssigneeDow Global Technologies LLC
InventorsYaokun Han, Martin R. Greaves, Paolo Sabatino, Ingrid Govaert
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Abstract
A composition of matter that exhibits two phases at lower temperatures (for example, less than about 50° C.) but only one-phase at higher temperatures (for example, above about 90° C.) is disclosed. The compositions comprise a low viscosity base oil which is a hydrocarbon oil and the high viscosity base oil which is a triblock polyalkylene glycol derived from a copolymer of 1, 2-propylene oxide and 1, 2-butylene oxide in which the PO/BO ratio is from 25/75 to 90/10 percent by weight and has a polymerization sequence of PO-BO-PO.
Claims12
A lubricant system comprising a low viscosity base oil and a high viscosity base oil where the low viscosity base oil is a hydrocarbon oil falling within the American Petroleum Institutions' classification I to IV, and the high viscosity base oil is an ABA triblock polyalkylene glycol derived from 1,2-propylene oxide as the A units and 1,2-butylene oxide as the B units, and wherein the ratio of units derived from propylene oxide to units derived from butylene oxide is in the range of 1/3 to 10/1 by weight.
Dependencies are inferred from the claim text.