# US 2021/0277323 A1 · Environmentally friendly lubricating grease for steel ropes

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- Number: US 2021/0277323 A1
- Document ID: US20210277323A1
- Status: Published application
- Kind: A1
- Application number: 17/258,456
- Filed: 2019-07-09
- Published: 2021-09-09
- Earliest claimed: 2018-07-09
- Assignees: Klueber Lubrication Muenchen SE & Co. KG
- Applicants: Klueber Lubrication Muenchen SE & Co. KG
- Inventors: Brigitte Mayrhofer; Maximilian Erhard; Patrick Wittmeyer; Stefan Seemeyer
- Web page: https://patentgrep.com/patent/US20210277323A1

## CPC

- C10M 169/06: Mixtures of thickeners and additives
- C10M 107/32: Condensation polymers of aldehydes or ketones; Polyesters; Polyethers
- C10M 117/04: containing hydroxy groups
- C10M 125/10: Metal oxides, hydroxides, carbonates or bicarbonates
- C10M 125/30: Clay
- C10M 143/06: containing butene
- C10M 2201/062: Oxides; Hydroxides; Carbonates or bicarbonates
- C10M 2201/065: Sulfides; Selenides; Tellurides
- C10M 2201/1036: used as thickening agents
- C10M 2201/105: Silica
- C10M 2205/026: Butene
- C10M 2207/026: with tertiary alkyl groups
- C10M 2207/126: monocarboxylic
- C10M 2207/127: polycarboxylic
- C10M 2207/1285: used as thickening agents
- C10M 2207/281: of (cyclo)aliphatic monocarboxylic acids
- C10M 2207/2835: used as base material
- C10M 2207/30: Complex esters, i.e. compounds containing at leasst three esterified carboxyl groups and derived from the combination of at least three different types of the following five types of compounds: monohydroxyl compounds, polyhydroxy xompounds, monocarboxylic acids, polycarboxylic acids or hydroxy carboxylic acids
- C10M 2209/084: Acrylate; Methacrylate
- C10M 2209/1023: used as base material
- C10M 2209/1033: used as base material
- C10M 2213/062: Polytetrafluoroethylene [PTFE]
- C10M 2219/044: Sulfonic acids, Derivatives thereof, e.g. neutral salts
- C10N 2010/04: Groups 2 or 12
- C10N 2020/02: Viscosity; Viscosity index
- C10N 2020/081: {Biodegradable compounds}
- C10N 2030/08: Resistance to extreme temperature
- C10N 2030/12: Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
- C10N 2030/52: {Base number [TBN]}
- C10N 2030/64: {Environmental friendly compositions}
- C10N 2030/66: {Hydrolytic stability}
- C10N 2030/74: {Noack Volatility}
- C10N 2040/32: Wires, ropes or cables lubricants
- C10N 2050/10: semi-solid; greasy
- 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

An environmentally acceptable lubricating grease, comprising: a) 50 wt % to 90 wt % of a biodegradable base oil comprising a biodegradable ester as base oil; b) 3 wt % to 25 wt % of a thickener selected from b1) 3 wt % to 12 wt % biodegradable calcium soap, b2) 3 wt % to 25 wt % bentonites, b3) and mixtures thereof; c) 4 wt % to 40 wt % additives, comprising c1) 1 wt % to 12 wt % fumed silicon dioxide and/or polytetrafluoroethylene and/or mixtures thereof, c2) 2 wt % to 45 wt % of a polymer selected from polyisobutylene, polyisobutylene/butene copolymer, polymethacrylates, polyesters and mixtures thereof, c3) 0.5 wt % to 20 wt % of a solid lubricant.

## Claims

### Claim 1

An environmentally acceptable lubricating grease, comprising:
a) 50 wt % to 90 wt % of a biodegradable base oil comprising a biodegradable ester as base oil,
b) 3 wt % to 25 wt % of a thickener selected from
b1) 3 wt % to 12 wt % biodegradable calcium soap,
b2) 3 wt % to 25 wt % bentonites,
b3) and mixtures thereof,
c) 4 wt % to 40 wt % additives, comprising
c1) 1 wt % to 12 wt % fumed silicon dioxide and/or polytetrafluoroethylene and/or mixtures thereof,
c2) 2 wt % to 45 wt % of a polymer selected from polyisobutylene, polyisobutylene/butene copolymer, polymethacrylates, polyesters and mixtures thereof,
c3) 0.5 wt % to 20 wt % of a solid lubricant.

### Claim 2 (depends on 1)

The lubricating grease according to claim 1, wherein a dropping point according to standard DIN ISO 2176 is over 150° C.

### Claim 3 (depends on 1)

The lubricating grease according to claim 1, wherein an upper operating temperature (UOT) according to standard DIN 58397, Part 1, is at least 150° C.

### Claim 4 (depends on 1)

The lubricating grease according to claim 1, wherein the lubricating grease and/or the ester a) has a thermal stability, determinable via TGA DIN 51006 of 150° C. to 200° C. and/or a volatility measured according to DIN 58397 of <10 wt % and/or a TAN Delta measured in accordance with DIN ASTM D-2619 (with extended running time of 400 h of 0.0 mg KOH/g to 20 mg KOH/g and/or an acid content (TAN) of less than 5 mg KOH/g.

### Claim 5 (depends on 1)

The lubricating grease according to claim 1, wherein the viscosity of the ester a) is at least 50 mm2/sec.

### Claim 6 (depends on 1)

The lubricating grease according to claim 1, wherein the biodegradable calcium soap b1) is selected from calcium soaps of fatty acids comprising calcium 12-hydroxystearate.

### Claim 7 (depends on 1)

The lubricating grease according to claim 1, wherein the fumed silicon dioxide c1) is selected from silica having a specific surface area of 90 to 130 m2/g.

### Claim 8 (depends on 1)

The lubricating grease according to claim 1, wherein the polymers of component c2) have a viscosity measured in accordance with DIN 51562, Part 1, at 100° C. of at least 600 mm2/s.

### Claim 9 (depends on 1)

The lubricating grease according to claim 1, further comprising as component c5) a corrosion inhibitor selected from alkaline earth metal oxides comprising calcium oxide and/or magnesium oxide, and calcium, magnesium and/or sodium sulfonates or salts of C8-C20 dicarboxylic acids comprising disodium sebacate.

### Claim 10 (depends on 1)

A method, comprising coating steel ropes comprising galvanized steel ropes with the lubricating grease according to claim 1.

### Claim 11 (depends on 1)

The lubricating grease according to claim 1, comprising 7 wt % to 20 wt % of the thickener b).

### Claim 12 (depends on 1)

The lubricating grease according to claim 1, wherein the thickener b) is selected from:
b1) 3 wt % to 12 wt % biodegradable calcium soap,
b2) 3.5 wt % to 20 wt % bentonites,
b3) and mixtures thereof.

### Claim 13 (depends on 1)

The lubricating grease according to claim 1, wherein the thickener b) is selected from:
b1) 3 wt % to 12 wt % biodegradable calcium soap,
b2) 4 wt % to 12 wt % bentonites,
b3) and mixtures thereof.

### Claim 14 (depends on 1)

The lubricating grease according to claim 1, comprising 7 wt % to 40 wt % of the additives c).

### Claim 15 (depends on 1)

The lubricating grease according to claim 1, wherein the additives c) comprises 4 wt % to 12 wt % fumed silicon dioxide and/or polytetrafluoroethylene and/or mixtures thereof.

### Claim 16 (depends on 1)

The lubricating grease according to claim 1, wherein the additives c) comprises 2 wt % to 25 wt % of the polymer c2).

### Claim 17 (depends on 1)

The lubricating grease according to claim 1, wherein the polymer c2) comprises polyesters comprising complex esters of neopentyl glycol/dimer acid/2-ethylhexanol.

### Claim 18 (depends on 1)

The lubricating grease according to claim 1, wherein the additives c) comprises 1 wt % to 10 wt % of the solid lubricant c3).

### Claim 19 (depends on 4)

The lubricating grease according to claim 4, wherein the lubricating grease and/or the ester a) has a volatility measured according to DIN 58397 of <5 wt %.

### Claim 20 (depends on 8)

The lubricating grease according to claim 8, wherein the polymers of component c2) have a viscosity measured in accordance with DIN 51562, Part 1, at 100° C. of at least 4000 mm2/s.