# US 4,391,721 A · Dispersant viscosity index improver comprising reaction product of a styrene-maleic anhydride copolymer, an aliphatic alcohol and a tertiary amino alcohol

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- Number: US 4,391,721 A
- Document ID: US4391721A
- Status: Granted
- Kind: A
- Application number: 06/247,600
- Filed: 1981-03-25
- Granted: 1983-07-05
- Earliest claimed: 1981-03-25
- Assignees: Standard Oil Company (Indiana)
- Inventors: Peter G. Pappas
- Web page: https://patentgrep.com/patent/US4391721A

## CPC

- C10L 1/2366: {homo- or copolymers derived from unsaturated compounds containing amine groups (C10L1/221 takes precedence)}
- C10M 133/08: containing hydroxy groups
- C10M 133/38: Heterocyclic nitrogen compounds
- C10M 143/10: containing aromatic monomer, e.g. styrene
- C10M 145/16: polycarboxylic
- C10M 149/04: containing monomers having an unsaturated radical bound to an amino group
- C10M 159/12: Reaction products
- C10M 2205/04: containing aromatic monomers, e.g. styrene
- C10M 2209/086: polycarboxylic, e.g. maleic acid
- C10M 2215/042: containing hydroxy groups; Alkoxylated derivatives thereof
- C10M 2215/22: Heterocyclic nitrogen compounds
- C10M 2217/022: containing monomers having an unsaturated radical bound to an amino group
- C10M 2217/028: containing monomers having an unsaturated radical bound to a nitrogen-containing hetero ring
- C10M 2217/06: Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound
- C10M 2227/00: Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
- C10L: FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
- C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33)

## 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.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

The composition of claim 1 wherein the aliphatic alcohol comprises a C.sub.6-20 aliphatic alcohol or a mixture thereof.

### Claim 3 (depends on 1)

The composition of claim 1 wherein the aliphatic alcohol comprises a C.sub.8-18 aliphatic alcohol or a mixture thereof.

### Claim 4 (depends on 1)

The composition of claim 1 wherein the tertiary amino alkanol comprises a compound of the formula ##STR2## wherein A is an alkylene group having 2 to 20 carbon atoms and each R is independently selected from the group consisting of alkyl groups having 1 to 20 carbon atoms.

### Claim 5 (depends on 4)

The composition of claim 4 wherein the tertiary amino alkanol comprises dialkylaminoethanol.

### Claim 6 (depends on 5)

The composition of claim 5 wherein the dialkyl amino ethanol comprises dibutylaminoethanol.

### Claim 7 (depends on 5)

The composition of claim 5 wherein the dialkyl amino ethanol comprises dimethylaminoethanol.

### Claim 8 (depends on 1)

The composition of claim 1 wherein the tertiary amino alkanol comprises a N-hydroxyalkyl heterocyclic tertiary amine compound.

### Claim 9 (depends on 8)

The composition of claim 8 wherein the N-hydroxyalkyl heterocyclic tertiary amine compound comprises a 4-(hydroxyalkyl)morpholine.

### Claim 10

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.

### Claim 11 (depends on 1)

A lubricant comprising a major portion of a lubricating oil and an effective dispersancy and viscosity index improvement providing amount of the additive composition of claim 1.

### Claim 12 (depends on 1)

A gasoline comprising a major portion of a hydrocarbon fuel boiling in the gasoline range and an effective deposit preventing amount of the composition of claim 1.