# US 8,772,211 B2 · Polymer blends useful as viscosity modifiers

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- Number: US 8,772,211 B2
- Document ID: US8772211B2
- Status: Granted
- Kind: B2
- Application number: 13/382,317
- Filed: 2010-07-06
- Published: 2012-06-21
- Granted: 2014-07-08
- Earliest claimed: 2009-07-08
- Assignees: The Lubrizol Corporation
- Applicants: Jack C. Kelley; Chor Huang
- Inventors: Jack C. Kelley; Chor Huang
- Web page: https://patentgrep.com/patent/US8772211B2

## CPC

- 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 143/00: Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation
- C10M 2203/1006: used as base material
- C10M 2205/04: containing aromatic monomers, e.g. styrene
- C10M 2209/10: Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M 2215/086: Imides [having hydrocarbon substituents containing less than thirty carbon atoms]
- C10M 2217/06: Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound
- C10M 2223/045: Metal containing thio derivatives
- C10M 2227/061: Esters derived from boron
- C10M 2227/066: derived from Mo or W
- C10N 2020/04: Molecular weight; Molecular weight distribution
- C10N 2020/073: {Star shaped polymers}
- C10N 2030/54: {Fuel economy}
- C10N 2040/04: Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
- C10N 2040/042: {for automatic transmissions}
- C10N 2040/08: Hydraulic fluids, e.g. brake-fluids
- C10N 2040/12: Gas-turbines
- C10N 2040/20: Metal working
- C10N 2040/25: Internal-combustion engines
- C10N 2040/26: Two-strokes {or two-cycle engines}
- C10N 2060/02: Reduction, e.g. hydrogenation
- 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

The disclosed invention relates to a composition comprising an oil of lubricating viscosity, a hydrogenated copolymer of an olefin block and vinyl aromatic block, wherein the polymer is optionally functionalized, and a star polymer. Use of the composition as a lubricating composition is disclosed.

## Claims

### Claim 1

A composition, comprising:
(I) an oil of lubricating viscosity;
(II) a hydrogenated copolymer comprising at least one of block A and at least one of block B, block A comprising an olefin polymer block, block B comprising a vinyl aromatic polymer block, the mole ratio of monomer units in block A to monomer units in the combination of block A plus block B being in the range from 0.5 to 0.9; wherein from 40 to 75 mol % of the repeat units in block A contain alkyl branching groups, wherein the hydrogenated copolymer is not functionalized; and
(III) a radial polymer comprising a core and from 3 to 12 polymeric arms extending from the core, each arm being derived from one or more conjugated dienes and one or more monoalkenyl aromatic hydrocarbons, each arm having a weight average molecular weight in the range from 40,000 to 200,000, each arm being hydrogenated at from 90 to 100% of the available double bonds, the radial polymer having a weight average molecular weight in the range from 300,000 to 2,500,000;
wherein the composition is an engine oil, and wherein the composition has (a) a sulphur content of 0.5 wt % or less, (b) a phosphorus content of 0.1 wt % or less, and (c) a sulphated ash content of 1.5 wt % or less.

### Claim 2 (depends on 1)

The composition of claim 1 wherein the weight ratio of (II) to (III) is in the range from 90:10 to 10:90.

### Claim 3 (depends on 1)

The composition of claim 1 wherein (II) and (III) are co-extruded to produce an extrudate, the extrudate being added to the oil of lubricating viscosity.

### Claim 4 (depends on 1)

The composition of claim 1 wherein the composition comprises a lubricating oil composition, the concentration of (II) and (III) in the lubricating oil composition being in the range from 0.5% to 2.0%.

### Claim 5 (depends on 1)

The composition of claim 1, wherein the copolymer (II) comprises repeat units derived from butadiene and repeat units derived from an alkylenearene.

### Claim 6 (depends on 1)

The composition of claim 1, wherein the copolymer comprises a backbone comprising repeat units derived from styrene and butadiene.

### Claim 7 (depends on 1)

The composition of claim 1, wherein the copolymer has a number average molecular weight in the range from 1000 to 1,000,000.

### Claim 8 (depends on 1)

The composition of claim 1 wherein the copolymer comprises repeat units derived from styrene and butadiene, wherein from 15 to 35 mol % of the repeat units are derived from styrene, and wherein from 90 to 100% of the double bonds available for hydrogenation are hydrogenated.

### Claim 9 (depends on 1)

The composition of claim 1 wherein block A of the hydrogenated copolymer (II) is substantially free of isoprene.

### Claim 10 (depends on 1)

The composition of claim 1 wherein the radial polymer (III) comprises 7 to 9 polymeric arms.

### Claim 11 (depends on 1)

The composition of claim 1 wherein the copolymer (II) comprises a backbone comprising repeat units derived from styrene and butadiene and is substantially free of isoprene; wherein the radial polymer (III) comprises 7 to 9 polymeric arms; and wherein the weight ratio of (II) to (III) is in the range from 90:10 to 10:90.