# US 5,344,863 A · Viscosity index improver

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- Number: US 5,344,863 A
- Document ID: US5344863A
- Status: Granted
- Kind: A
- Application number: 07/897,036
- Filed: 1992-06-11
- Granted: 1994-09-06
- Earliest claimed: 1991-07-05
- Assignees: Sanyo Chemical Industries, Ltd.
- Inventors: Kouzou Sakai; Shigeyuki Yoshida; Makoto Dakurige
- Web page: https://patentgrep.com/patent/US5344863A

## CPC

- C10M 161/00: Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
- C10M 129/10: having hydroxy groups bound to a carbon atom of a six-membered aromatic ring
- C10M 129/40: monocarboxylic
- C10M 129/72: of polycarboxylic acids
- C10M 129/76: containing free hydroxy or carboxyl groups
- C10M 143/00: Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation
- C10M 143/02: Polyethylene
- C10M 145/36: etherified
- C10M 145/38: esterified
- C10M 149/06: containing monomers having an unsaturated radical bound to an amido or imido group
- C10M 149/10: containing monomers having an unsaturated radical bound to a nitrogen-containing hetero ring
- C10M 149/16: between the nitrogen-containing monomer and an aldehyde or ketone
- C10M 157/00: Lubricating compositions characterised by the additive being a mixture of two or more macromolecular compounds covered by more than one of the main groups C10M143/00 - C10M155/00, each of these compounds being essential
- C10M 2205/00: Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M 2205/02: containing acyclic monomers
- C10M 2205/022: Ethene
- C10M 2205/14: Synthetic waxes, e.g. polythene waxes
- C10M 2205/16: Paraffin waxes; Petrolatum, e.g. slack wax
- C10M 2205/17: Fisher Tropsch reaction products
- C10M 2205/22: Alkylation reaction products with aromatic type compounds, e.g. Friedel-crafts
- C10M 2207/023: having hydroxy groups bound to carbon atoms of six-membered aromatic rings
- C10M 2207/026: with tertiary alkyl groups
- C10M 2207/027: Neutral salts thereof
- C10M 2207/125: having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M 2207/126: monocarboxylic
- C10M 2207/129: having hydrocarbon chains of thirty or more carbon atoms
- C10M 2207/282: of (cyclo)aliphatic oolycarboxylic acids
- C10M 2207/285: of aromatic polycarboxylic acids
- C10M 2207/286: of polymerised unsaturated acids
- C10M 2207/287: Partial esters
- C10M 2207/288: containing free carboxyl groups
- C10M 2207/289: containing free hydroxy groups
- C10M 2207/34: Esters having a hydrocarbon substituent of thirty or more carbon atoms, e.g. substituted succinic acid derivatives
- C10M 2209/084: Acrylate; Methacrylate
- C10M 2209/102: Polyesters
- C10M 2209/104: of alkylene oxides containing two carbon atoms only
- C10M 2209/105: of alkylene oxides containing three carbon atoms only
- C10M 2209/107: of two or more specified different alkylene oxides covered by groups C10M2209/104 - C10M2209/106
- C10M 2209/108: etherified
- C10M 2209/109: esterified
- C10M 2215/04: having amino groups bound to acyclic or cycloaliphatic carbon atoms
- C10M 2215/042: containing hydroxy groups; Alkoxylated derivatives thereof
- C10M 2215/26: Amines
- C10M 2217/023: the amino group containing an ester bond
- C10M 2217/024: containing monomers having an unsaturated radical bound to an amido or imido group
- C10M 2217/028: containing monomers having an unsaturated radical bound to a nitrogen-containing hetero ring
- C10M 2217/042: between the nitrogen-containing monomer and an aldehyde or ketone
- C10M 2217/043: Mannich bases
- C10M 2217/046: Polyamines, i.e. macromoleculars obtained by condensation of more than eleven amine monomers
- C10M 2217/06: Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound
- C10M 2219/044: Sulfonic acids, Derivatives thereof, e.g. neutral salts
- C10N 2010/04: Groups 2 or 12
- 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)
- C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS

## Abstract

A viscosity index improver which contains a polymer dispersion comprising: a polyolefin having a weight average molecular weight of 10,000 to 500,000, a dispersant comprising a reaction product of an ethylenically unsaturated dicarboxylic acid added polyolefin with a carboxylic acid-reactive compound selected from the group consisting of an amine, a ketimine compound, an alcohol and an isocyanate compound and an organic liquid medium comprising a liquid phenolic derivative selected from the group consisiting of an alkyl phenol and an alkyl salicylate.

## Claims

### Claim 1

A polymer dispersion comprising:
(a) a polyolefin having a weight average molecular weight of 10,000 to 500,000;
(b) a dispersant comprising a reaction product of an ethylenically unsaturated dicarboxylic acid-added polyolefin with a carboxylic acid-reactive compound selected from the group consisting of an amine, a ketimine compound, an alcohol and an isocyanate compound, said reaction product having an amide linkage, an imide linkage or an ester linkage, and
(c) a phenolic derivative selected from the group consisting of an alkyl salicylate, phenol having one alkyl group of 1 to 20 carbon atoms and phenol having two alkyl groups of 1 to 20 carbon atoms.

### Claim 2 (depends on 1)

An improver according to claim 1, wherein the polyolefin is an ethylene-propylene copolymer or a polyolefin containing 0.5 to 3% by weight of a basic nitrogen atom.

### Claim 3 (depends on 1)

An improver according to claim 1, wherein the medium contains not less than 30% by weight of the phenolic derivative.

### Claim 4 (depends on 1)

An improver according to claim 1, which contains 20 to 60% by weight of the polyolefin.

### Claim 5 (depends on 1)

An improver according to claim 1, which contains 0.5 to 20% by weight of the dispersant.

### Claim 6 (depends on 1)

An improver according to claim 1, which contains 30 to 70% by weight of the medium.

### Claim 7 (depends on 1)

An improver according to claim 1, wherein the weight ratio of the unsaturated dicarboxylic acid-added polyolefin to the carboxylic acid-reactive compound is in the range of from 20:80 to 80:20.

### Claim 8 (depends on 1)

An improver according to claim 1, wherein the reaction product has an oxyalkylene structure.

### Claim 9 (depends on 1)

An improver according to claim 1, wherein the carboxylic acid-reactive compound is a polyoxyalkylene alcohol having an amino group or a ketimino group.

### Claim 10 (depends on 9)

An improver according to claim 9, wherein the polyoxyalkylene alcohol has a number average molecular weight of 1,000 to 4,000.

### Claim 11 (depends on 1)

An improver according to claim 1, wherein the unsaturated dicarboxylic acid-added polyolefin has a backbone composed of the same olefinic monomer unit as the polyolefin having a weight average molecular weight of 10,000 to 500,000.

### Claim 12 (depends on 1)

An improver according to claim 1, wherein the alkyl group in the phenolic derivative contains 4 to 12 carbon atoms.

### Claim 13 (depends on 1)

An improver according to claim 1, wherein the alkyl phenol is di-sec-butylphenol.

### Claim 14 (depends on 1)

An improver according to claim 1, wherein the medium further contains a carboxylate ester or an alkyleneoxide adduct of an alkyl phenol.

### Claim 15 (depends on 14)

An improver according to claim 14, wherein said ester is a diester of a dicarboxylic acid and a monohydric alcohol having 1 to 10 carbon atoms.

### Claim 16 (depends on 1)

An improver according to claim 1, wherein the ethylenically unsaturated dicarboxylic acid is maleic acid, itaconic acid, chloromaleic acid, an anhydride thereof, a halide thereof, a monoester thereof or a monoamide thereof, fumaric acid, a fumaryl halide, a fumarate monoester or a fumarmonoamide.

### Claim 17 (depends on 1)

An improver according to claim 1, wherein the amount of the unsaturated dicarboxylic acid-added polyolefin is a polyolefin to which an unsaturated dicarboxylic acid has been added in the range of 10 to 250 moles per mole thereof.

### Claim 18 (depends on 1)

An improver according to claim 1, which further contains a mono-or dialkyl benzene sulfonate salt.

### Claim 19 (depends on 1)

An improver according to claim 1, wherein the reaction product is an ester of an aliphatic carboxylic acid and a hydroxy terminated compound derived from the unsaturated dicarboxylic acid-added polyolefin and the the polyoxyalkylene alcohol having an amino group or a ketimino group.