Mulitigrade Engine Oil with Improved Mini-Rotary Viscometer Results and Process for Preparing the Same

Patent metadata

Field	Value
Publication number	US-2016160145-A1
Application number	US-201615019669-A
Country	US
Kind code	A1
Filing date	Feb 9, 2016
Priority date	Mar 15, 2013
Publication date	Jun 9, 2016
Grant date	—

Abstract

Disclosed herein is a multigrade engine oil with excellent low temperature viscometric properties, including improved mini-rotary viscometer (MRV) results. In one embodiment, the multigrade engine oil comprises a major amount of a first lubricating base oil having a MRV viscosity at a test temperature from about −25° C. to about −40° C. of greater than 60,000 cP and a MRV yield stress at the test temperature of greater than zero; a second lubricating base oil having a MRV viscosity at the test temperature of 60,000 cP of less and no MRV yield stress at the test temperature; and a pour point depressant. The multigrade engine oil has a MRV viscosity at the test temperature of 60,000 cP or less and no MRV yield stress at the test temperature. Since the first lubricating base oil is present in a major amount, the first lubricating base oil is present in an amount greater than any other component of the multigrade engine oil, including the amount of the second lubricating base oil. Also disclosed herein is a process for preparing a multigrade engine oil with excellent low temperature viscometric properties, including improved MRV results.

First claim

What is claimed is:

1 . A multigrade engine oil comprising:
a) a major amount of a first lubricating base oil having a MRV viscosity at a test temperature from −25° C. to −40° C. of greater than 60,000 cP and a MRV yield stress at the test temperature of greater than zero; b) a second lubricating base oil having a MRV viscosity at the test temperature of 60,000 cP or less and no MRV yield stress at the test temperature; and c) a pour point depressant,
wherein the multigrade engine oil has a MRV viscosity at the test temperature of 60,000 cP or less and no MRV yield stress at the test temperature.

2 . The multigrade engine oil of claim 1 , further comprising one or more base oil additives in addition to the pour point depressant.

3 . The multigrade engine oil of claim 1 , wherein the test temperature is −30° C.

4 . The multigrade engine oil of claim 3 , wherein the multigrade engine oil has a MRV viscosity at −30° C. of 50,000 cP or less.

5 . The multigrade engine oil of claim 1 , wherein the multigrade engine oil comprises:
the first lubricating base oil in a major amount; the second lubricating base oil in a minor amount; and the pour point depressant in an amount of from about 0.1 wt % to about 2 wt %.

6 . The multigrade engine oil of claim 1 , wherein the multigrade engine oil comprises:
the first lubricating base oil in an amount of from about 40 wt % to about 90 wt %; the second lubricating base oil in an amount of from about 5 wt % to about 35 wt %; and the pour point depressant in an amount of from about 0.1 wt % to about 2 wt %.

7 . The multigrade engine oil of claim 6 , wherein the multigrade engine oil comprises the pour point depressant in an amount of about 0.1 wt % to about 0.5 wt %.

8 . The multigrade engine oil of claim 1 , wherein the multigrade engine oil comprises the first lubricating base oil in an amount of from about 40 wt % to about 95 wt % and the second lubricating base oil in an amount of from about 5 wt % to about 35 wt %.

9 . The multigrade engine oil of claim 1 , wherein the multigrade engine oil comprises the first lubricating base oil in an amount of from about 40 wt % to about 80 wt %; the second lubricating base oil in an amount of from about 10 wt % to about 30 wt %; the pour point depressant in an amount of from about 0.1 wt % to about 1.0 wt %; and one or more base oil additives in addition to the pour point depressant.

10 . The multigrade engine oil of claim 1 , wherein the first lubricating base oil is a Group I base oil.

11 . The multigrade engine oil of claim 1 , wherein the second lubricating base oil is a Group II base oil.

12 . The multigrade engine oil of claim 1 , wherein the multigrade engine oil is a SAE viscosity grade 0W-X, 5W-X, or 10W-X engine oil, wherein X represents an integer selected from the group consisting of 20, 30, and 40.

13 . A process for preparing a multigrade engine oil, comprising:
a) providing in a major amount a first lubricating base oil having a MRV viscosity at a test temperature from −25° C. to −40° C. of greater than 60,000 cP and a MRV yield stress at the test temperature of greater than zero; b) providing a second lubricating base oil having a MRV viscosity at the test temperature of 60,000 cP or less and no MRV yield stress at the test temperature; c) providing a pour point depressant; and d) blending the first lubricating base oil, the second lubricating base oil, and the pour point depressant to provide the multigrade engine oil, wherein the multigrade engine oil has a MRV viscosity at the test temperature of 60,000 cP or less and no MRV yield stress at the test temperature.

14 . The process for preparing the multigrade engine oil of claim 13 , wherein the test temperature is −30° C.

15 . The process for preparing the multigrade engine oil of claim 14 , wherein the multigrade engine oil has a MRV viscosity at −30° C. of 50,000 cP or less.

16 . The process for preparing the multigrade engine oil of claim 13 , further comprising: providing one or more base oil additives in addition to the pour point depressant; and blending the one or more base oil additives with the first lubricating base oil, the second lubricating base oil, and the pour point depressant to provide the multigrade engine oil.

17 . The process for preparing the multigrade engine oil of claim 13 , wherein the multigrade engine oil after blending comprises the first lubricating base oil in a major amount; the second lubricating base oil in a minor amount; and the pour point depressant in an amount of from about 0.1 wt % to about 2 wt %.

18 . The process for preparing the multigrade engine oil of claim 13 , wherein the multigrade engine oil after blending comprises: the first lubricating base oil in an amount of from about 40 wt % to about 80 wt %; the second lubricating base oil in an amount of from about 10 wt % to about 30 wt %; and the pour point depressant in an amount of from about 0.1 wt % to about 1 wt %.

19 . The process for preparing the multigrade engine oil of claim 13 , wherein the first lubricating base oil is a Group I base oil and the second lubricating base oil is a Group II base oil.

20 . The process for preparing the multigrade engine oil of claim 13 , wherein the multigrade engine oil is a SAE viscosity grade 0W-X, 5W-X, or 10W-X engine oil, wherein X represents an integer selected from the group consisting of 20, 30, and 40.

Assignees

• Chevron Usa Inc

Inventors

• Souza Alex Beringuy
• Baeta Neves Gerson Vieira
• Lemos Luiz Fernando Feijo
• Souza Jr Wanderley Carreira
• Ansari Matthew Hussain
• Brafman Rebecca Elizabeth

Classifications

• C10M171/02

  Specified values of viscosity or viscosity index · CPC title

• C10N2020/02

  Viscosity; Viscosity index · CPC title

• C10M2203/1025

  used as base material · CPC title

• C10N2040/25

  Internal-combustion engines · CPC title

• C10M2203/1006

  used as base material · CPC title