A polyalkylene glycol-based compound of formula (1):

##STR00001##

may be one in which R.sup.1 is a monovalent hydrocarbon group having 1 to 32 carbon atoms, a monovalent aromatic hydrocarbon group having 6 to 42 ring carbon atoms, a monovalent acyl group having 2 to 32 carbon atoms, or a monovalent oxygen-containing hydrocarbon group having 2 to 32 carbon atoms; R.sup.2 is a monovalent hydrocarbon group having 1 to 32 carbon atoms, a monovalent aromatic hydrocarbon group having 6 to 42 ring carbon atoms, a monovalent acyl group having 2 to 32 carbon atoms, a monovalent oxygen-containing hydrocarbon group having 2 to 32 carbon atoms, or a hydrogen atom; R.sup.3 is a divalent hydrocarbon group having 4 carbon atoms; R.sup.4 is a divalent hydrocarbon group having 2 or 3 carbon atoms; m and n are respectively numbers between 1 and 40 and 0 and 20; and m/(m+n)≥0.5.

A polyalkylene glycol-based compound of formula (1):

##STR00001##

may be one in which R.sup.1 is a monovalent hydrocarbon group having 1 to 32 carbon atoms, a monovalent aromatic hydrocarbon group having 6 to 42 ring carbon atoms, a monovalent acyl group having 2 to 32 carbon atoms, or a monovalent oxygen-containing hydrocarbon group having 2 to 32 carbon atoms; R.sup.2 is a monovalent hydrocarbon group having 1 to 32 carbon atoms, a monovalent aromatic hydrocarbon group having 6 to 42 ring carbon atoms, a monovalent acyl group having 2 to 32 carbon atoms, a monovalent oxygen-containing hydrocarbon group having 2 to 32 carbon atoms, or a hydrogen atom; R.sup.3 is a divalent hydrocarbon group having 4 carbon atoms; R.sup.4 is a divalent hydrocarbon group having 2 or 3 carbon atoms; m and n are respectively numbers between 1 and 40 and 0 and 20; and m/(m+n)≥0.5.

Embodiments of the present disclosure are directed towards esterified oil soluble polyalkylene glycols of Formula (I): R.sup.1[O(R.sup.2O).sub.n(R.sup.3O).sub.m(C═O)R.sup.4].sub.p, where R.sup.1 is a linear alkyl having 1 to 18 carbon atoms, a branched alkyl having 4 to 18 carbon atoms or an aryl with 6 to 30 carbon atoms; R.sup.2O is an oxypropylene moiety derived from 1, 2-propylene oxide; R.sup.3O is an oxybutylene moiety derived from butylene oxide, where R.sup.2O and R.sup.3O are in a block or a random distribution; R.sup.4 is a linear alkyl with to 18 carbon atoms, a branched alkyl with 4 to 18 carbon atoms or an aryl with 6 to 18 carbon atoms; n and m are each independently integers ranging from 0 to 20 wherein n+m is greater than 0, and p is an integer from 1 to 4.

Embodiments of the present disclosure are directed towards esterified oil soluble polyalkylene glycols of Formula (I): R.sup.1[O(R.sup.2O).sub.n(R.sup.3O).sub.m(C═O)R.sup.4].sub.p, where R.sup.1 is a linear alkyl having 1 to 18 carbon atoms, a branched alkyl having 4 to 18 carbon atoms or an aryl with 6 to 30 carbon atoms; R.sup.2O is an oxypropylene moiety derived from 1, 2-propylene oxide; R.sup.3O is an oxybutylene moiety derived from butylene oxide, where R.sup.2O and R.sup.3O are in a block or a random distribution; R.sup.4 is a linear alkyl with to 18 carbon atoms, a branched alkyl with 4 to 18 carbon atoms or an aryl with 6 to 18 carbon atoms; n and m are each independently integers ranging from 0 to 20 wherein n+m is greater than 0, and p is an integer from 1 to 4.

A polyalkylene glycol-based compound may have formula (1):

##STR00001##

wherein R.sup.1 is a monovalent aromatic hydrocarbon group having 6 to 42 ring carbon atoms; R.sup.2 is a monovalent aromatic hydrocarbon group having 6 to 42 carbon atoms or a hydrogen atom; R.sup.3 is a divalent hydrocarbon group having 2 to 4 carbon atoms; and m is a number in a range of from 1 to 40.

A polyalkylene glycol-based compound may have formula (1):

##STR00001##

wherein R.sup.1 is a monovalent aromatic hydrocarbon group having 6 to 42 ring carbon atoms; R.sup.2 is a monovalent aromatic hydrocarbon group having 6 to 42 carbon atoms or a hydrogen atom; R.sup.3 is a divalent hydrocarbon group having 2 to 4 carbon atoms; and m is a number in a range of from 1 to 40.

A polyalkylene glycol having an end-group of the general formula: ##STR00001## in which each R.sup.2 independently represents a hydroxyl, alkyl, alkenyl, aryl, heteroaryl, benzyl, or polyalkylene glycol group, and each R.sup.3 independently represents a hydroxyl, alkyl, alkenyl, aryl, heteroaryl, benzyl, or polyalkylene glycol group; m is 0, 1, 2, 3, 4, 5 or 6; and n is 0, 1, 2 or 3. A lubricating oil composition comprising this polyalkylene glycol. A refrigerant composition comprising this polyalkylene glycol. A method of lubricating moving parts of an industrial or automotive system comprising applying a composition to the parts, wherein the composition comprises this polyalkylene glycol.

A polyalkylene glycol having an end-group of the general formula: ##STR00001## in which each R.sup.2 independently represents a hydroxyl, alkyl, alkenyl, aryl, heteroaryl, benzyl, or polyalkylene glycol group, and each R.sup.3 independently represents a hydroxyl, alkyl, alkenyl, aryl, heteroaryl, benzyl, or polyalkylene glycol group; m is 0, 1, 2, 3, 4, 5 or 6; and n is 0, 1, 2 or 3. A lubricating oil composition comprising this polyalkylene glycol. A refrigerant composition comprising this polyalkylene glycol. A method of lubricating moving parts of an industrial or automotive system comprising applying a composition to the parts, wherein the composition comprises this polyalkylene glycol.

An automotive lubricant base oil formulation contains a base oil, preferably a hydrocarbon base oil, having a kinematic viscosity of 100 centiStokes or less at 40 degrees Celsius and an ailcyl capped oil soluble polymer where the alkyl capped oil soluble polymer has the structure of Formula 0): where R.sup.1 is an alkyl having from one to thirty carbons, R.sup.2 and R.sup.3 are independently selected from alkyl groups having three or four carbons and can be in block form or randomly combined, R.sup.4 is an alkyl having from one to 18 carbon atoms, n and m are independently numbers ranging from zero to 20 provided that n+m is greater than zero and p is a number within a range of one to three and a kinematic viscosity of 100 centiStokes or less at 40 degrees Celsius is useful in a lubricant for mechanical devices.
R.sup.1[O(R.sup.2O).sub.n(R.sup.3O).sub.mR.sup.4].sub.p  (I)

An automotive lubricant base oil formulation contains a base oil, preferably a hydrocarbon base oil, having a kinematic viscosity of 100 centiStokes or less at 40 degrees Celsius and an ailcyl capped oil soluble polymer where the alkyl capped oil soluble polymer has the structure of Formula 0): where R.sup.1 is an alkyl having from one to thirty carbons, R.sup.2 and R.sup.3 are independently selected from alkyl groups having three or four carbons and can be in block form or randomly combined, R.sup.4 is an alkyl having from one to 18 carbon atoms, n and m are independently numbers ranging from zero to 20 provided that n+m is greater than zero and p is a number within a range of one to three and a kinematic viscosity of 100 centiStokes or less at 40 degrees Celsius is useful in a lubricant for mechanical devices.
R.sup.1[O(R.sup.2O).sub.n(R.sup.3O).sub.mR.sup.4].sub.p  (I)