# US 2022/0033730 A1 · Antioxidant mixture for low viscous polyalkylene glycol basestock

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- Number: US 2022/0033730 A1
- Document ID: US20220033730A1
- Status: Published application
- Kind: A1
- Application number: 17/297,415
- Filed: 2019-11-14
- Published: 2022-02-03
- Earliest claimed: 2018-11-28
- Assignees: BASF SE
- Applicants: BASF SE
- Inventors: Marcel HARHAUSEN; Frank RITTIG; David LEY; Michael ROIDA; Wolfgang SCHROF
- Web page: https://patentgrep.com/patent/US20220033730A1

## CPC

- C10M 169/04: Mixtures of base-materials and additives
- C10M 107/34: Polyoxyalkylenes
- C10M 133/12: having amino groups bound to a carbon atom of a six-membered aromatic ring
- C10M 135/26: containing carboxyl groups; Derivatives thereof
- C10M 141/08: at least one of them being an organic sulfur-, selenium- or tellurium-containing compound
- C10M 2209/1033: used as base material
- C10M 2209/1075: used as base material
- C10M 2209/1085: used as base material
- C10M 2215/064: Di- and triaryl amines
- C10M 2215/26: Amines
- C10M 2219/084: containing hydroxy groups; Derivatives thereof
- C10M 2219/087: containing hydroxy groups; Derivatives thereof, e.g. sulfurised phenols
- C10N 2020/02: Viscosity; Viscosity index
- C10N 2020/04: Molecular weight; Molecular weight distribution
- C10N 2030/10: Inhibition of oxidation, e.g. anti-oxidants
- 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 invention relates to a lubricant comprising a polyalkylene glycol basestock, an aromatic amine of the formula (I) as defined hereinafter, and a thioether of the formula (II) as defined hereinafter. The invention further relates to a method for preparing the lubricant comprising the step of contacting the polyalkylene glycol basestock, the aromatic amine of the formula (I), and the thioether of the formula (II); and to a method for reducing the oxidative degradation of the lubricant comprising the step of contacting the polyalkylene glycol basestock, the aromatic amine of the formula (I), and the thioether of the formula (II).

## Claims

### Claim at position 1

-14. (canceled)

### Claim 15

A lubricant comprising a polyalkylene glycol basestock,
an aromatic amine of the formula (I)
wherein R1 and R2 are H or together represent the group A
and R3 and R4 are independently H or C2-C30 alkyl, and
a thioether of the formula (II)

### Claim 16 (depends on 15)

The lubricant according to claim 15, comprising 0.05-5 wt % of the aromatic amine.

### Claim 17 (depends on 16)

The lubricant according to claim 16, comprising 0.5-1.0 wt % of the aromatic amine.

### Claim 18 (depends on 15)

The lubricant according to claim 15, comprising 0.05-5 wt % of the thioether.

### Claim 19 (depends on 18)

The lubricant according to claim 18, comprising 0.5-1.0 wt % of thioether.

### Claim 20 (depends on 15)

The lubricant according to claim 15, where the weight ratio between the thioether and the aromatic amine is from 1.5:1 to 1:1.5.

### Claim 21 (depends on 20)

The lubricant according to claim 20, where the weight ratio between the thioether and the aromatic amine is from 5:1 to 1:5.

### Claim 22 (depends on 15)

The lubricant according to claim 15, where the polyalkylene glycol basestock has a kinematic viscosity at 40° C. in the range from 10-300 mm2/s.

### Claim 23 (depends on 15)

The lubricant according to claim 15, where the polyalkylene glycol basestock is an ethoxylated and propoxylated C1-C20 alkanol or C2-C20 alkandiol.

### Claim 24 (depends on 15)

The lubricant according to claim 15, where the polyalkylene glycol basestock is an ethoxylated and propoxylated C1-C8 alkanol.

### Claim 25 (depends on 15)

The lubricant according to claim 15, where the polyalkylene glycol basestock is an alkoxylated alcohol with a number average molecular weight Mn in the range from 400 to 10 000 Da.

### Claim 26 (depends on 15)

The lubricant according to claim 15, where the polyalkylene glycol basestock is an alkoxylated alcohol with a number average molecular weight Mn in the range from 1000 to 1500 Da.

### Claim 27 (depends on 23)

The lubricant according to claim 23, where the alkoxylated alcohol contains 30 to 70 wt-% ethylene oxide units, and 70 to 30 wt-% of propylene oxide units.

### Claim 28 (depends on 15)

The lubricant according to claim 15, where R1 and R2 together represent the group A, R3 is H, and R4 is C2-C30 alkyl.

### Claim 29 (depends on 15)

The lubricant according to claim 15, where R1 and R2 are H, and R3 and R4 are independently C2-C30 alkyl.

### Claim 30 (depends on 15)

The lubricant according to claim 15, where R3 and R4 are independently H or n-propyl, isopropyl, n-, iso-, or tert-butyl, n-pentyl, isoamyl, neopentyl, 2-ethylbutyl, n-hexyl, 1-methylpentyl, 1,3-dimethylbutyl, n-heptyl, isoheptyl, n-octyl, 1,4,4-trimethyl-2-pentyl, 3,4-, 3,5- or 4,5-dimethyl-1-hexyl, 3- or 5-methyl-1-heptyl, 1,1,3,3-tetramethylbutyl, 2-ethylhexyl, branched octyl, branched octyl as obtained from a dimer of isobutylene, n-nonyl, 1,1,3-trimethylhexyl, branched nonyl as obtained from a trimer of tripropylene, 1-methylundecyl, 2-n-butyl-n-octyl, branched dodecyl obtained from a trimer of isobutylene or a tetramer of propylene, branched pentadecyl obtained from a pentamer of propylene, 2-n-hexyl-n-decyl or 2-n-octyl-n-dodecyl.

### Claim 31 (depends on 15)

A method for preparing the lubricant as defined in claim 15 comprising the step of contacting the polyalkylene glycol basestock, the aromatic amine of the formula (I), and the thioether of the formula (II).

### Claim 32 (depends on 15)

A method for reducing the oxidative degradation of the polyalkylene glycol basestock as defined in claim 15 comprising the step of contacting the polyalkylene glycol basestock, the aromatic amine of the formula (I), and the thioether of the formula (II).