Bp Chemicals Limited

John McMahon

John R Blackborow

James Maxwell Kerr

James Mann Scotland

John D Fotheringham

This invention relates to a method of producing polyisobutenes from a feedstock comprising a mixture of C4 hydrocarbons and containing isobutene and at least 5% by weight of 1-butene using a cationic polymerisation catalyst, characterised in that prior to polymerisation, the feedstock is subjected to a pre-treatment step in order to reduce the 1-butene content thereof to a level which is at least 20% lower than that of the 1-butene content in the initial mixed C4 hydrocarbon feedstock prior to the pre-treatment thereof and the polyisobutene so formed is (a) very high in its vinylidene group content and (b) substantially free of halogen.

Production of polyisobutenes

This invention relates to a two-stroke engine oil which comprises polybutene base oils which are either very low in or are substantially free of n-butenes in the polymer backbone. The absence of n-butenes in the polybutenes significantly reduces smoke emission in exhaust gases generated by the use of the engine oil. Polybutenes such as ULTRAVIS.RTM. which are substantially free of chlorine and have a high degree of terminal unsaturation are particularly preferred.

Two-stroke engine oils

This invention relates to a process for producing substituted acylating agents by the reaction of an enophile with an ene by the thermal route wherein (a) the molar ratio of the enophile to the ene is at least 3:1 and (b) the reaction pressure is raised to above 20 psig an least after addition of the enophile reaction to the reaction is completed and is maintained substantially constant until at least 80% of the ene reactant has been converted to the corresponding acylating agent. The agents so produced are substantially free of chlorine and can be further reacted with an amine or a hydroxy compound to form a derivative which can be used as an additive for a lubricating oil or a fuel.

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Linlithgow, United Kingdom

John McMahon