Oil additive
The present disclosure relates to the use of a C 12-20 polyalkyl methacrylate polymer as a lubricating oil additive such that the C 12-20 polyalkyl methacrylate polymer accounts for 0.1 to 0.3% by weight of the finished lubricating oil. The use comprises the addition of said C 12-20 polyalkyl methacrylate polymer to a lubricating oil based on mineral oil to improve the filtration of said lubricating oil based on mineral oil. Further, the present disclosure relates to finished lubricating oils resulting from such a use and methods of lubricating the metal surface of a gear or axle comprising applying to the metal surface such a finished lubricating oil.
1 . Use of a C 12-20 polyalkyl methacrylate polymer as a lubricating oil additive such that the C 12-20 polyalkyl methacrylate polymer accounts for 0.1 to 0.3% by weight of the finished lubricating oil, which use comprises the addition of said C 12-20 polyalkyl methacrylate polymer to a lubricating oil based on mineral oil to improve the filtration of said lubricating oil based on mineral oil.
2 . Use according to claim 1 wherein the lubricating oil based on mineral oil is a gear oil.
3 . Use according to claim 1 wherein the mean CETOP filtration stage 2 test value of the finished lubricating oil (the oil resulting from said use) is over 90%.
4 . Use according to claim 3 wherein the finished lubricating oil (the oil resulting from said use) meets the specification by Scania (STO 1:0).
5 . Use according to claim 1 wherein the C 1220 polyalkyl methacrylate polymer accounts for 0.1 or 0.2% by weight of the finished lubricating oil.
6 . Use according to claim 1 of a composition comprising the C 12-20 polyalkyl methacrylate polymer.
7 . Use according to claim 6 wherein the composition comprises about 45% by weight of the C 12-20 polyalkyl methacrylate polymer and about 55% by weight of a mineral carrier oil.
8 . Use according to claim 7 wherein the composition has a viscosity of 800 mm 2 /s (ASTM D4052) at 100° C.
9 . Use according to claim 1 wherein the lubricating oil based on mineral oil has a viscosity of 80W-90 or 85W-140.
10 . Use according to claim 1 wherein the lubricating oil based on mineral oil is for automotive or industrial applications.
11 . Use according to claim 1 wherein the lubricating oil based on mineral oil is a part synthetic base stock.
12 . Use according to claim 1 wherein the lubricating oil based on mineral oil comprises brightstock.
13 . Use according to claim 1 wherein the lubricating oil based on mineral oil is Kuwait Petroleum Company, Repsol YPF, Total, Esso or SAFOR base stock.
14 . Use according to claim 1 wherein the lubricating oil based on mineral oil and/or the finished lubricating oil comprises a further additive, which further additive is added to the lubricating oil based on mineral oil or the finished lubricating oil prior to, simultaneously with or subsequently to the composition comprising a C 12-20 polyalkyl methacrylate polymer in a mineral carrier oil.
15 . Use according to claim 1 wherein the lubricating oil based on mineral oil is a formulated gear lubricant composition.
16 . A finished lubricating oil resulting from a use as defined in claim 1 .
17 . A method of lubricating the metal surface of a gear or axle comprising applying to the metal surface a finished lubricating oil as defined in claim 16 .
18 . A method according to claim 17 wherein the method comprises adding the finished lubricating oil to a transmission or axle and operating the transmission or axle.
19 . A gear or axle which has been lubricated in a method according to claim 17 .
20 . A composition comprising a C 12-20 polyalkyl methacrylate polymer in a mineral carrier oil for use as defined in claim 1 .
21 . A gear additive package comprising a composition as defined in claim 20.