A capped oil soluble polyalkylene glycol has the following structure: R.sup.1O-(AO).sub.nR.sup.2 where: R.sup.1 is a linear or branched alkyl or aryl with one to 18 carbon atoms; AO refers to residuals of monomers selected from 1,2-butylene oxide and 1,2-propylene oxide selected so that at least 50 weight-percent of the (AO).sub.n component is 1,2-butylene oxide residuals; n is selected to provide a kinematic viscosity at 100 degrees Celsius of less than 5 centiStokes for the non-capped polyalkylene glycol; and R.sup.2 is a linear or branched alkyl or aryl having from 1-8 carbon atoms and wherein the capped oil soluble polyalkylene glycol is characterized by having a kinematic viscosity of less than 4.5 centiStokes at 100 degrees Celsius and a viscosity index of greater than 150.

A capped oil soluble polyalkylene glycol has the following structure: R.sup.1O-(AO).sub.nR.sup.2 where: R.sup.1 is a linear or branched alkyl or aryl with one to 18 carbon atoms; AO refers to residuals of monomers selected from 1,2-butylene oxide and 1,2-propylene oxide selected so that at least 50 weight-percent of the (AO).sub.n component is 1,2-butylene oxide residuals; n is selected to provide a kinematic viscosity at 100 degrees Celsius of less than 5 centiStokes for the non-capped polyalkylene glycol; and R.sup.2 is a linear or branched alkyl or aryl having from 1-8 carbon atoms and wherein the capped oil soluble polyalkylene glycol is characterized by having a kinematic viscosity of less than 4.5 centiStokes at 100 degrees Celsius and a viscosity index of greater than 150.

The invention relates to an aqueous lubricant composition comprising at least: water; from 0.1% to 15% by mass of at least one water-soluble polyalkylene glycol; and from 0.1% to 5% by mass of at least one galactomannan polysaccharide. The invention further relates to the use of such an aqueous lubricant composition as a lubricant in a metalworking process, in particular for reducing, or even preventing, the formation of gummy residues.

The invention relates to an aqueous lubricant composition comprising at least: water; from 0.1% to 15% by mass of at least one water-soluble polyalkylene glycol; and from 0.1% to 5% by mass of at least one galactomannan polysaccharide. The invention further relates to the use of such an aqueous lubricant composition as a lubricant in a metalworking process, in particular for reducing, or even preventing, the formation of gummy residues.

The present invention relates to an aqueous lubricating composition comprising at least: water, from 0.001% to 80% by weight of at least one polyalkylene glycol; and from 0.001% to 50% by weight of at least one alkoxylated, preferably ethoxylated, castor oil.

The present invention also relates to the use of an aqueous lubricating composition as lubricant in a metalworking process, in particular for reducing, indeed even preventing, the formation of gummy residues.

Disclosed is the use of a lubricating composition including at least one base oil and at least one polyalkylene glycol (PAG) produced by polymerisation or copolymerisation of alkylene oxides including between 3 and 8 carbon atoms, at least one of which being a butylene oxide, for preventing or reducing pre-ignition in an engine, preferably in a vehicle engine.

The use of a polyalkylene glycol of formula HO-(A-O).sub.p(CH.sub.2CH.sub.2O).sub.m-(A-O).sub.qH wherein A is a C.sub.3- to C.sub.20-alkylene group or a mixture of such alkylene groups, m is a number of from 2 to 100 and p and q are each numbers of from 1 to 100, as an additive in a fuel.

The use of a polyalkylene glycol of formula HO-(A-O).sub.p(CH.sub.2CH.sub.2O).sub.m-(A-O).sub.qH wherein A is a C.sub.3- to C.sub.20-alkylene group or a mixture of such alkylene groups, m is a number of from 2 to 100 and p and q are each numbers of from 1 to 100, as an additive in a fuel.

The present disclosure concerns engine lubricant compositions including at least one base oil, at least one viscosity index improver polymer and at least one polyalkylene glycol, obtained by polymerization or copolymerization of alkylene oxides comprising from 3 to 8 carbon atoms, including at least one butylene oxide, the quantity of polyalkylene glycol being from 1 to 28% by mass with respect to the total mass of lubricant composition. Using at least one polyalkylene glycol, obtained by polymerization or copolymerization of alkylene oxides including from 3 to 8 carbon atoms, further including at least one butylene oxide in a base oil improves engine cleanliness while not increasing, or indeed while decreasing, the consumption of petrol or diesel fuels by the engine.

The present disclosure concerns engine lubricant compositions including at least one base oil, at least one viscosity index improver polymer and at least one polyalkylene glycol, obtained by polymerization or copolymerization of alkylene oxides comprising from 3 to 8 carbon atoms, including at least one butylene oxide, the quantity of polyalkylene glycol being from 1 to 28% by mass with respect to the total mass of lubricant composition. Using at least one polyalkylene glycol, obtained by polymerization or copolymerization of alkylene oxides including from 3 to 8 carbon atoms, further including at least one butylene oxide in a base oil improves engine cleanliness while not increasing, or indeed while decreasing, the consumption of petrol or diesel fuels by the engine.