# US 2013/0157909 A1 · Corrosion Inhibiting Polyalkylene Glycol-Based Lubricant Compositions

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- Number: US 2013/0157909 A1
- Document ID: US20130157909A1
- Status: Published application
- Kind: A1
- Application number: 13/811,764
- Filed: 2011-08-17
- Published: 2013-06-20
- Earliest claimed: 2010-08-31
- Assignees: Dow Global Technologies LLC
- Inventors: Martin R. Greaves; Daniel Zweifel; Evelyn A. Zaugg-Hoozemans
- Web page: https://patentgrep.com/patent/US20130157909A1

## CPC

- C10M 105/14: polyhydroxy
- C10M 169/04: Mixtures of base-materials and additives
- C10M 2203/10: Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M 2203/106: Naphthenic fractions
- C10M 2207/2835: used as base material
- C10M 2207/288: containing free carboxyl groups
- C10M 2209/104: of alkylene oxides containing two carbon atoms only
- C10M 2209/1045: used as base material
- C10M 2209/105: of alkylene oxides containing three carbon atoms only
- C10M 2209/1055: used as base material
- C10M 2209/106: of alkylene oxides containing four carbon atoms only
- C10M 2209/1065: used as base material
- C10M 2215/04: having amino groups bound to acyclic or cycloaliphatic carbon atoms
- C10M 2215/064: Di- and triaryl amines
- C10M 2215/065: Phenyl-Naphthyl amines
- C10M 2215/223: Five-membered rings containing nitrogen and carbon only
- C10M 2219/044: Sulfonic acids, Derivatives thereof, e.g. neutral salts
- C10M 2223/04: Phosphate esters
- C10M 2223/041: Triaryl phosphates
- C10M 2223/043: Ammonium or amine salts thereof
- C10M 2223/047: Thioderivatives not containing metallic elements
- C10M 2229/041: containing aliphatic substituents
- C10N 2020/015: {Distillation range}
- C10N 2020/02: Viscosity; Viscosity index
- C10N 2020/04: Molecular weight; Molecular weight distribution
- C10N 2030/12: Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
- C10N 2040/04: Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
- 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

Lubricant compositions including a random or block copolymer first high-EO content polyalkylene glycol, a random copolymer second polyalkylene glycol based on propylene oxide and butylene oxide or a second polyalkylene homopolymer having propylene oxide or butylenes oxide units and at least one corrosion inhibitor selected from the group of sarcosines, amine phosphates, and calcium dinonylnaphthalenesulfonate/carboxylates are provided. Lubricant compositions for extreme conditions are also provided.

## Claims

### Claim 1

A lubricant composition comprising:
a random or block copolymer first polyalkylene glycol based on ethylene oxide and propylene oxide, wherein at least 30 percent by weight of the polyalkylene glycol is ethylene oxide units;
an effective amount of a random copolymer second polyalkylene glycol based on propylene oxide and butylene oxide, wherein at least 50 percent by weight of the second polyalkylene glycol is butylene oxide units or an effective amount of a second polyalkylene homopolymer having propylene oxide or butylene oxide units; and
an effective amount of at least one corrosion inhibitor selected from the group of sarcosines, amine phosphates, and calcium dinonylnaphthalenesulfonate/carboxylates.

### Claim 2 (depends on 1)

The lubricant composition of claim 1 wherein the effective amount of the second polyalkylene glycol is between 5 and 50 wt %.

### Claim 3

Any one of the preceding claims wherein the effective amount of the corrosion inhibitor is between 0.25 and 1.5 wt %.

### Claim 4

Any one of the preceding claims wherein the second polyalkylene glycol comprises between 50 and 75 wt % butylene oxide units.

### Claim 5

Any one of the preceding claims wherein the first polyalkylene glycol has a kinematic viscosity at 40° C. between 30 and 250 mm2/s (cSt).

### Claim 6

Any one of the preceding claims wherein the lubricant composition is capable of passing ASTM D665B for at least 24 hours after initiation.

### Claim 7

A lubricant composition for use in extreme conditions comprising:
a random or block copolymer polyalkylene glycol based on ethylene oxide and propylene oxide having a molecular weight greater than 2,000 g/mole and wherein at least 30 wt % of the copolymer polyalkylene glycol is ethylene oxide units;
10-20 wt % of a polyalkylene homopolymer having propylene oxide or butylene oxide units having a molecular weight between 400 and 1500 g/mole; and
at least one corrosion inhibitor selected from the group consisting of (a) an amine salt of an aliphatic phosphoric acid ester; (b) an alkenyl succinic acid half ester in mineral oil; (c) an amine salt of an alkyl phosphoric acid combined with a dithiophosphoric acid derivative; (d) a combination of barium dinonylnaphthalene sulfonate and dinonylnaphthalene carboxylate in a hydrotreated naphthenic oil; and (e) combinations thereof.

### Claim 8 (depends on 7)

The lubricant composition of claim 7 further comprising:
N-phenyl-1,1,3,3-tetramethylbutyl-naphthalen-1-amine, as a first antioxidant;
an alkylated diphenylamine formed from the reaction product of N-phenyl-benzeneamine and 2,4,4-trimethylpentene, or a mixed octylated and butylated diphenylamine, as a second antioxidant;
a phosphorous based extreme pressure additive; and
a yellow metal passivator.

### Claim 9 (depends on 7, 8)

The lubricant composition of any one of claims 7-8 wherein the random or block copolymer polyalkylene glycol contains between 50 and 85 wt % ethylene oxide units, the remainder being polypropylene oxide units.

### Claim 10 (depends on 7, 8, 9)

The lubricant composition of any one of claims 7-9 wherein the phosphorus-based extreme pressure additive is selected from a group consisting of isopropylated triaryl phosphates; amin-phosphates; phosphor-thionates; acid phosphates; alkyl phosphates; and combinations thereof.

### Claim 11 (depends on 7, 8, 9, 10)

The lubricant composition of any one of claims 7-10 wherein the yellow metal passivator is selected from a group consisting of benzotriazole, tolytriazole, tolutriazole, mixtures of sodium tolytriazolee and sodium tolutriazole, and combinations thereof.

### Claim 12 (depends on 7, 8, 9, 10, 11)

The lubricant composition of any one of claims 7-11 capable of passing ASTM D665B for at least 24 hours following initiation.

### Claim 13 (depends on 7, 8, 9, 10, 11, 12)

The lubricant composition of any one of claims 7-12 wherein the polyalkylene homopolymer is an n-butanol started butylene oxide homopolymer with a molecular weight between 400 and 600 g/mole.

### Claim 14 (depends on 7, 8, 9, 10, 11, 12)

The lubricant composition of any one of claims 7-12 wherein the polyalkylene homopolymer is an n-butanol started propylene oxide homopolymer with a molecular weight between 900-1100 g/mole.

### Claim 15 (depends on 7, 8, 9, 10, 11, 12)

The lubricant composition of any one of claims 7-12 wherein the polyalkylene homopolymer is a diol started propylene oxide homopolymer with a molecular weight between 900 and 1100 g/mole.

### Claim 16 (depends on 7, 8, 9, 10, 11, 12)

The lubricant composition of any one of claims 7-12 wherein the polyalkylene homopolymer is diol started butylene oxide homopolymer with a molecular weight between 400-600 g/mole.

### Claim 17 (depends on 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)

The lubricant composition of any one of claims 7-16 further comprising a silicon-based antifoaming agent.

### Claim 18

Any one of the preceding claims wherein the lubricant composition is capable of passing ASTM 665B for at least 4 hours after initiation.