专利名称：Viscosity index improver additive
composition
发明人：Brankling, David,Crawford, John申请号：EP81304395.7申请日：19810924公开号：EP0048631B1公开日：19850724
摘要：A viscosity index improver additive composition comprising from 1 to 25% byweight of a hydrogenated alkenylarene/conjugated diene interpolymer having a numberaverage molecular weight greater than 20,000, from 30 to 72% by weight of a syntheticester lubricating oil comprising an alkyl ester of a saturated aliphatic carboxylic acid andfrom 15 to 50% by weight of a non-synthetic mineral lubricating oil, all percentages byweight being expressed in terms of the total weight of the composition. In a modificationof the invention the proportion of mineral lubricating oil is decreased and the proportionof ester lubricating oil is increased by the addition of, for example, either an ethylenecopolymer or a polybutene in an amount of from 1 to 25% by weight.
申请人：Orobis Limited
地址：Belgrave House 76 Buckingham Palace Road London SW1W 0SU GB
国籍：GB
代理机构：Fawcett, Richard Fennelly
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