ADDITIVES FOR LUBRICATING OILS CONTAINING STYRENE AND HEAVY C IN12 XX-C IN20 XX ALKYL ESTERS OF METHACRYLIC ACID, PREPARATION METHOD AND APPLICATIONS

摘要

ABSTRACT OF THE DISCLOSUREThe present invention relates to additives forlubricating oils, constituted by a copolymer prepared from35-55%, and preferably 40-50%, of substituted or non-substitutedstyrene monomers, and from 65-45% and preferably 60-50% ofheavy C12-C20 alkyl esters of methacrylic acid, saidcopolymer having a polydispersity which is as low as possible, aparameter of solubility close to that of the oil for which theadditives are intended and a molecular weight of between 80,000and 200,000. Preferably the heavy alkyl esters of methacrylicacid are constituted in at least 80% by C16-C20 alkylesters. The copolymer may be modified by a comonomer and vinylcompounds. One application of the invention is the formulationof lubricating oils.