Pib as high viscosity lubricant base stock

Abstract

Lubricant composition comprising a polyisobutene polymer having a number average molecular weight of 300-5000 g/mol and at least 60 mol % terminal double bonds based on the total number of double bonds in the polymer, and an ester component and/or an alkylated naphthalene compound having kinematic viscosity in the range of 2 to 15 mm 2 /s at 100° C.

1 .- 13 . (canceled) 
     
     
         14 . A lubricant composition comprising
 a) 9.0 to 94.0 wt % based on the total amount of lubricant composition of a polyisobutene polymer having a number average molecular weight of 300-5000 g/mol according to DIN 55672 and at least 60 mol % terminal double bonds based on the total number of double bonds in the polymer, and   b) 5 to 50 wt % based on the total amount of lubricant composition of an ester component having kinematic viscosity according to DIN 51562-1 in the range of 2 to 15 mm 2 /s at 100° C.,   wherein the ratio of the polyisobutene polymer a) to the ester component b) is from 1:12 to 12:1 based on the relative weight of these components in the lubricant composition.   
     
     
         15 . The lubricant composition according to  claim 14 , further comprising 20 to 80 wt % of a base oil component. 
     
     
         16 . The lubricant composition according to  claim 15 , wherein the base oil component comprises a polyalphaolefin and/or a Group II and/or Group III mineral oil. 
     
     
         17 . The lubricant composition according to  claim 16 , wherein the base oil component comprises a polyalphaolefin 4, polyalphaolefin 6 and/or polyalphaolefin 8. 
     
     
         18 . The lubricant composition according to  claim 17 , wherein the base oil component comprises a polyalphaolefin 6. 
     
     
         19 . The lubricant composition according to  claim 14 , wherein the composition does not include an ethylene/propylene copolymer. 
     
     
         20 . The lubricant composition according to  claim 14 , wherein the composition does not include a polyisobutene polymer having less than 60 mol % terminal double bonds. 
     
     
         21 . The lubricant composition according to  claim 14 , wherein the composition does not include a polyalkylmethacrylate. 
     
     
         22 . The lubricant composition according to  claim 14 , wherein the ester component is selected from the group consisting of diisodecyladipate, diisotridecyladipate, di(2-propylheptyl)adipate and trimethylolpropanolcaprylate. 
     
     
         23 . The lubricant composition according to  claim 14 , further comprising an additive component selected from the group consisting of antioxidants, dispersants, foam inhibitors, demulsifiers, seal swelling agents, friction reducers, anti-wear agents, detergents, corrosion inhibitors, extreme pressure agents, metal deactivators, rust inhibitors, pour point depressants and mixtures thereof. 
     
     
         24 . The lubricant composition according to  claim 23 , wherein the additive component is present in an amount of 0.1 to 20 wt % of the total lubricant composition. 
     
     
         25 . The lubricant composition according to  claim 14 , having kinematic viscosity at −40° C. according to DIN 51562-1 of not higher than 110000 mm 2 /s. 
     
     
         26 . A light duty engine oil, medium duty engine oil, heavy duty engine oil, industrial engine oils, marine engine oils, automotive engine oils, crankshaft oils, compressor oils, refrigerator oils, hydrocarbon compressor oils, very low-temperature lubricating oils and fats, high temperature lubricating oils and fats, wire rope lubricants, textile machine oils, refrigerator oils, aviation and aerospace lubricants, aviation turbine oils, transmission oils, gas turbine oils, spindle oils, spin oils, traction fluids, transmission oils, plastic transmission oils, passenger car transmission oils, truck transmission oils, industrial transmission oils, industrial gear oils, insulating oils, instrument oils, brake fluids, transmission liquids, shock absorber oils, heat distribution medium oils, transformer oils, fats, chain oils, minimum quantity lubricants for metalworking operations, oil to the warm and cold working, oil for water-based metalworking liquids, oil for neat oil metalworking fluids, oil for semi-synthetic metalworking fluids, oil for synthetic metalworking fluids, drilling detergents for the soil exploration, hydraulic oils, in biodegradable lubricants or lubricating greases or waxes, chain saw oils, release agents, moulding fluids, gun, pistol and rifle lubricants or watch lubricants and food grade approved lubricants which the comprises the lubricant composition of  claim 14 .