Novel pour point depressants via anionic polymerization of (meth) acrylic monomers

摘要

Copolymer prepared by anionic polymerisation of a mixture of (a) 0-60 wt.% acrylic monomer(s) of formula where R = hydrogen or methyl; R1 = 105C alkyl; (b) 0-60 wt.% acrylic monomer(s) of formula where R2 = 6-14C alkyl; (c) 15-80 wt.% acrylic monomer(s) of formula where R3 = 15-22C alkyl; at least one of (a) and (b) are present in a total amount of 20-85 wt.%. The copolymer has polydispersity index of 1-1.5. A concentrate for addition to a lubricating oil comprises 25-75 wt.% copolymer and 25-75 wt.% normally liquid organic diluent. A pour point depressant comprises the copolymer. A lubricating oil formulation comprises a major amount of lubricating oil and the copolymer. A method of improving the pour point of a lubricating oil using the above copolymer is also claimed.