Poly alpha olefin compositions

Patent metadata

Field	Value
Publication number	US-9796645-B2
Application number	US-201213612246-A
Country	US
Kind code	B2
Filing date	Sep 12, 2012
Priority date	Jul 19, 2005
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

This invention is directed to a poly alpha olefin (PAO) composition formed in a first oligomerization, wherein at least portions of the PAO have properties that make them highly desirable for a subsequent oligomerization. A preferred process for producing this PAO uses a single site catalyst at high temperatures without adding hydrogen to produce a low viscosity PAO with excellent Noack volatility at high conversion rates. This PAO comprises a dimer product with at least 25 wt % tri-substituted vinylene olefins wherein said dimer product is highly desirable as a feedstock for a subsequent oligomerization. This PAO also comprises trimer and optionally higher oligomer products with outstanding properties that make these products useful as lubricant basestocks following hydrogenation.

First claim

What is claimed is:

1. A poly alpha olefin (PAO), wherein said PAO has a kinematic viscosity at 100° C. (KV 100 ) of less than 20 cSt and comprises dimer and trimer—wherein the dimer contains at least 25 wt % of tri-substituted vinylene olefins represented by the following structure:

wherein the dashed line represents the two possible locations where the unsaturated double bond may be located and Rx and Ry are independently selected from a C 3 to C 21 alkyl group; and wherein the trimer of the PAO has a viscosity index (VI) of greater than 125.

2. The PAO of claim 1 , wherein Rx and Ry are independently selected from a C 3 to C 11 alkyl group.

3. The PAO of claim 1 , wherein the tri-substituted vinylene dimer is represented by the following structure:

wherein the dashed line represents the two possible locations where the unsaturated double bond may be located.

4. The PAO of claim 1 , wherein the PAO contains less than 70 wt % of di-substituted vinylidene represented by the following:
RqRzC═CH 2

wherein Rq and Rz are independently selected from alkyl groups.

5. The PAO of claim 1 , wherein the dimer portion of the PAO contains greater than 30 wt % of tri-substituted vinylene olefins.

6. The PAO of claim 1 , wherein the dimer portion of the PAO contains from 25 to 80 wt % of tri-substituted vinylene olefins.

7. The PAO of claim 1 , wherein the dimer portion of the PAO is a distillate effluent.

8. The PAO of claim 1 , wherein the dimer portion of the PAO is a reactor effluent that has not been subjected to distillation.

9. The PAO of claim 1 , wherein the PAO has not been subjected to a separate isomerization process following oligomerization.

10. The PAO of claim 1 , wherein the trimer portion of the PAO has a Noack volatility of not greater than 14 wt %.

11. The PAO of claim 1 further comprising tetramers and higher oligomers, wherein the tetramers and higher oligomers portion of the PAO has a Noack volatility of not greater than 6 wt %.

12. The PAO of claim 1 , wherein the trimer portion of the PAO after a hydrogenation step has a kinematic viscosity at 100° C. of less than 4 cSt.

13. The PAO of claim 1 , wherein the trimer portion of the PAO after a hydrogenation step has a KV 100 of less than 3.6 cSt.

14. The PAO of claim 1 further comprising tetramers and higher oligomers, wherein the tetramers and higher oligomers portion of the PAO after a hydrogenation step has a KV 100 of less than 30 cSt.

15. The PAO of claim 1 consisting of the PAO dimer portion and a PAO oligomer portion remaining after the PAO dimer portion is removed, wherein the PAO oligomer portion remaining after the PAO dimer portion is removed has a KV 100 of less than 25 cSt.

16. The PAO of claim 1 which is made by oligomerization reaction from a feedstock, wherein the feedstock utilized in the oligomerization reaction is comprised of at least one linear alpha olefin wherein the linear alpha olefin is selected from at least one of 1-hexene, 1-octene, 1-nonene, 1-decene, 1-dodecene, 1-tetradecene, and combinations thereof.

17. The PAO of claim 1 , when prepared by a process comprising oligomerizing one or more C 6 to C 14 linear alpha olefins in the presence of a metallocene oligomerization catalyst.

Assignees

• Emett Craig J
• Hagemeister Mark P
• Han Wenning W
• Harrington Bruce A
• Matsunaga Phillip T
• Ruff Charles J
• Stavens Kevin B
• Wu Margaret M
• Exxonmobil Chemical Patents Inc

Inventors

• Emett Craig J
• Hagemeister Mark P
• Han Wenning W
• Harrington Bruce A
• Matsunaga Phillip T
• Ruff Charles J
• Stavens Kevin B
• Wu Margaret M

Classifications

• C10N2070/00

  Specific manufacturing methods for lubricant compositions · CPC title

• C10N2020/071

  Branched chain compounds · CPC title

• C10N2020/011

  Cloud point · CPC title

• C10N2020/067

  Unsaturated Compounds · CPC title

• C10N2020/019

  Shear stability · CPC title