High-temperature lubricant composition
US-2015353862-A1 · Dec 10, 2015 · US
Magneto-rheological grease composition
US10377964B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10377964-B2 |
| Application number | US-201213679568-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 16, 2012 |
| Priority date | Nov 16, 2011 |
| Publication date | Aug 13, 2019 |
| Grant date | Aug 13, 2019 |
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Abstract
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The invention provides a magneto-rheological grease composition which contains (a) a base oil including at least 30% by mass of an ether type synthetic oil; (b) an aliphatic diurea thickener; and (c) magnetic particles in an amount of 45 to 95% by mass based on the total mass of the composition. The magneto-rheological grease composition can show superior thermal stability, dispersion stability and magneto-rheological properties.
First claim
Opening claim text (preview).
The invention claimed is: 1. A magneto-rheological grease composition comprising: (a) a base oil comprising at least 30% by mass of an ether type synthetic oil having a kinetic viscosity at 40° C. of 60 to 140 mm 2 /s; (b) an aliphatic diurea thickener; and (c) magnetic particles in an amount of 45 to 95% by mass based on the total mass of the composition, wherein the aliphatic diurea thickener is represented by formula (1): wherein R 1 and R 2 are a straight-chain or branched alkyl group having 6 to 20 carbon atoms, and wherein R 1 and R 2 are the same. 2. The magneto-rheological grease composition of claim 1 , wherein the ether type synthetic oil is an alkyldiphenyl ether oil. 3. The magneto-rheological grease composition of claim 1 , wherein the magnetic particles are particles of at least one selected from the group consisting of iron and iron compounds. 4. The magneto-rheological grease composition of claim 1 , wherein the magnetic particles have an average particle diameter of 0.1 to 10 μm. 5. The magneto-rheological grease composition of claim 1 , wherein the magnetic particles are ferromagnetic particles. 6. The magneto-rheological grease composition of claim 5 , wherein the ferromagnetic particles are iron particles. 7. The magneto-rheological grease composition of claim 1 , further comprising an antioxidant (d). 8. The magneto-rheological grease composition of claim 7 , wherein the antioxidant is an amine type antioxidant. 9. The magneto-rheological grease composition of claim 8 , wherein the amine type antioxidant is alkyldiphenylamine, α-naphthylamine, or a mixture thereof. 10. The magneto-rheological grease composition of claim 1 , having a worked penetration of 250 to 450. 11. An apparatus where the grease composition of claim 1 is enclosed in a repeatedly moving part.
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Classifications
used as thickening material · CPC title
used as base material · CPC title
used as base material · CPC title
used as base material · CPC title
used as base material · CPC title
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- What does patent US10377964B2 cover?
- The invention provides a magneto-rheological grease composition which contains (a) a base oil including at least 30% by mass of an ether type synthetic oil; (b) an aliphatic diurea thickener; and (c) magnetic particles in an amount of 45 to 95% by mass based on the total mass of the composition. The magneto-rheological grease composition can show superior thermal stability, dispersion stability…
- Who is the assignee on this patent?
- Kyodo Yushi, Yokohama National Univ
- What technology area does this patent fall under?
- Primary CPC classification C10M169/06. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Aug 13 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).