Dispersant viscosity index improver comprising reaction product of a styrene-maleic anhydride copolymer, an aliphatic alcohol and a tertiary amino alcohol
AssigneeStandard Oil Company (Indiana)
InventorPeter G. Pappas
Life of this patent
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Abstract
Dispersant viscosity index improvers comprise the reaction product of an aliphatic alcohol or mixtures thereof, a tertiary amino alcohol and a styrene maleic anhydride copolymer.
Claims12
A dispersant viscosity index improving additive composition, resistant to oxidative thickening and loss of dispersancy, which composition comprises the reaction product of a styrene-maleic anhydride copolymer, an aliphatic alcohol having at least 6 carbon atoms and a tertiary amino alkanol, said composition having been prepared by substantially esterifying said copolymer with said aliphatic alcohol to produce a substantially-esterified copolymer and subsequently transesterifying said substantially-esterified copolymer with said tertiary amino alkanol.
A process for the preparation of a dispersant viscosity index improving lubricating oil additive, which process comprises reacting a styrene-maleic anhydride copolymer with an aliphatic alcohol having at least 6 carbon atoms until the styrene-maleic anhydride copolymer is substantially esterified and reacting the substantially esterified copolymer with a tertiary amino alkanol.
Dependencies are inferred from the claim text.