Transmission lubricant

摘要

The present invention relates to a transmission lubricant comprising at least 30% by weight of polyalkyl (meth)acrylate. The present invention further describes polyalkyl (meth)acrylates for use in lubricants and also processes for preparing them and their use. The present lubricants can be used particularly in wind turbine transmissions.

主权项

1. A lubricant, comprising at least 30% by weight of a polyalkyl(meth)acrylate, wherein the polyalkyl(meth)acrylate comprises:
a) 0 to 0.5% by weight of repeat units derived from (meth)acrylates of the formula (I): wherein R is hydrogen or methyl, and R1 is an alkyl radical having 1 to 5 carbon atoms; b) 50 to 100% by weight of repeat units derived from (meth)acrylates of the formula (II): wherein R is hydrogen or methyl, and R2 is an alkyl radical having 6 to 15 carbon atoms; and c) 0 to 50% by weight of repeat units derived from (meth)acrylates of the formula (III): wherein R is hydrogen or methyl, and R3 is an alkyl radical having 16 to 40 carbon atoms; andwherein
the polyalkyl(meth)acrylate comprises n-dodecyl thioether and t-dodecylthioether terminal groups, the repeat units of the formula (II) comprise a mixture of linear and branched radicals such that 5 to 80% of the R2 radicals are branched, based on the weight of the repeat units of the formula (II), the polyalkyl(meth)acrylate is obtained by copolymerization of the component monomers in the presence of 2 to 6% by weight relative to a total weight of the component monomers of a combination of n-dodecylmercaptan and t-dodecyl mercaptan, and a weight average molecular weight of the polyalkyl(meth)acrylate is from 3000 to 25,000 g/mol and a polydispersity of the polyalkyl(meth)acrylate is from 1.1 to 2.5.