Additives for Fuels and Oils Comprising Functionalised Diblock Copolymers

摘要

Concentrates containing specific functionalised diblock copolymers serve as effective additives for improving the cold flow behaviour of fuels and oils, the copolymers being derived from a terminally-unsaturated intermediate polymer obtained via a metallocene process involving hydrogen.

主权项

1. An additive concentrate comprising a functionalised diblock copolymer in admixture with an organic liquid miscible with fuel or oil, the copolymer comprising 2 polymeric blocks wherein:
(i) the first block consists of a chain of ethylenic structural units, optionally interrupted by one or more structural units derived from 1-alkene co-monomers higher than ethylene, and (ii) the second block comprises a chain of structural units derived from one or more α,β-unsaturated monomers selected from styrene, substituted styrene, acrylate, methacrylate and diene compounds,and wherein said first and second blocks of the copolymer are terminally joined by means of the following structural linkage:wherein each R group independently represents an alkyl or aryl group and R′ represents hydrogen or an alkyl group, and wherein the aromatic ring substituent joined to the second block is positioned meta or para to the aromatic ring substituent joined to the first block.