Polyols, preparation and use thereof
US-9464158-B2 · Oct 11, 2016 · US
Energy efficient polyalkylene glycols and lubricant composition containing same
US9296975B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9296975-B2 |
| Application number | US-201214118712-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 8, 2012 |
| Priority date | Jun 21, 2011 |
| Publication date | Mar 29, 2016 |
| Grant date | Mar 29, 2016 |
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Abstract
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A polyalkylene glycol comprising: a random copolymer comprising units derived from EO and units derived from PO initiated with polytetrahydrofuran; wherein the polyalkylene glycol has a pour point of less than or equal to −30° C. as measured using ASTM D97 and a traction value of less than 0.0165 at a contact pressure of 1.25 GPa, speed=2 m/s, SRR of 100% and temperature of 80° C. is provided. Also provided are lubricant compositions containing such polyalkylene glycol.
First claim
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We claim: 1. A polyalkylene glycol comprising: a random copolymer comprising units derived from EO and units derived from PO initiated with polytetrahydrofuran; wherein the polyalkylene glycol has a pour point of less than or equal to −30° C. as measured using ASTM D97 and a traction value of less than 0.0165 at a contact pressure of 1.25 GPa, speed=2 m/s, SRR of 100% and temperature of 80° C. 2. The polyalkylene glycol according to claim 1 wherein the polyalkylene glycol has a traction value of less than 0.0135 at a contact pressure of 1.25 GPa, speed=2 m/s, SRR=50% and temperature of 80° C. 3. The polyalkylene glycol according to claim 1 wherein the pour point is less than or equal to −35° C. 4. The polyalkylene glycol according to claim 1 wherein the polyalkylene glycol exhibits visual stability at 20° C. 5. The polyalkylene glycol according to claim 1 wherein the polyalkylene glycol exhibits visual stability at 4° C. 6. The polyalkylene glycol according to claim 1 wherein the polyalkylene glycol exhibits visual stability at 50° C. 7. The polyalkylene glycol according to claim 1 wherein the polyalkylene glycol exhibits visual stability at −25° C. 8. The polyalkylene glycol according to claim 1 wherein the random copolymer comprises from 55 to 70 percent by weight of units derived from EO and from 45 to 30 percent by weight of units derived from PO. 9. The polyalkylene glycol according to claim 1 wherein the random copolymer comprises from 60 to 65 percent by weight of units derived from EO and from 35 to 40 percent by weight of units derived from PO. 10. The polyalkylene glycol according to claim 1 wherein the polytetrahydrofuran has a weight average molecular weight between 150 and 350 g/mole. 11. The polyalkylene glycol according to claim 1 wherein the polytetrahydrofuran has a weight average molecular weight between 200 and 300 g/mole. 12. A polyalkylene glycol comprising: a random copolymer comprising units derived from EO and units derived from PO initiated with polytetrahydrofuran in which the polytetrahydrofuran has a weight average molecular weight between 200 and 400 g/mole and having less than 10 weight percentage component having a molecular weight greater than 600 g/mole. 13. The polyalkylene glycol according to claim 12 having a pour point of less than or equal to −30° C. as measured using ASTM D97. 14. The polyalkylene glycol according to claim 12 having a traction value of less than 0.0165 at a contact pressure of 1.25 GPa, speed=2 m/s, SRR of 100% and temperature of 80° C. 15. The polyalkylene glycol according to claim 12 exhibiting visual stability at temperatures from −25 to 50° C. 16. A lubricant composition comprising the polyalkylene glycol according to claim 1 . 17. The lubricant composition according to claim 12 further comprising one or more additives selected from the group consisting of antioxidants, anti-wear additives and corrosion inhibitors.
Assignees
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Classifications
Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title
Viscosity; Viscosity index · CPC title
Hydrolytic stability · CPC title
Molecular weight; Molecular weight distribution · CPC title
Pour-point; Viscosity index · CPC title
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- What does patent US9296975B2 cover?
- A polyalkylene glycol comprising: a random copolymer comprising units derived from EO and units derived from PO initiated with polytetrahydrofuran; wherein the polyalkylene glycol has a pour point of less than or equal to −30° C. as measured using ASTM D97 and a traction value of less than 0.0165 at a contact pressure of 1.25 GPa, speed=2 m/s, SRR of 100% and temperature of 80° C. is provided. …
- Who is the assignee on this patent?
- Greaves Martin R, Van Voorst Ronald, Rand Cynthia L, and 3 more
- What technology area does this patent fall under?
- Primary CPC classification C08G65/2606. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Mar 29 2016 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).