Lubricating oil composition
US-12384982-B2 · Aug 12, 2025 · US
Well defined low molecular weight dispersant polymethacrylates
US12168757B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12168757-B2 |
| Application number | US-202117924247-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 7, 2021 |
| Priority date | May 13, 2020 |
| Publication date | Dec 17, 2024 |
| Grant date | Dec 17, 2024 |
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- Title
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Abstract
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The present invention provides, among other things, a process to produce a low molecular weight dispersant polymethacrylate polymer (“LMWDPMA”), and the LMWDPMA itself, along with the use of the LMWDPMA in a lubricating composition, as well as a method for lubricating an internal combustion engine as disclosed herein.
First claim
Opening claim text (preview).
What is claimed is: 1. A dispersant polymethacrylate polymer (“DPMA”) comprising an amine terminated polymethacrylate polymer represented by Formula II where R 1 is an alkyl group of 1 to 24 carbon atoms; X is a nitrogen-containing group; and n is an integer of 3 to 30. 2. The DPMA of claim 1 wherein the nitrogen-containing group comprises 3-morpholinopropylamine. 3. The DPMA of claim 1 wherein the nitrogen-containing group comprises 3-(dimethylamino)-1-propylamine. 4. A lubricant composition comprising an oil of lubricating viscosity and the DPMA as claimed in claim 1 . 5. A method of lubricating an internal combustion engine comprising supplying to the internal combustion engine a lubricating composition comprising the lubricating composition of claim 4 . 6. A process for preparing a dispersant polymethacrylate polymer comprising 1) preparing a vinyl terminated polymethacrylate polymer by catalytic chain transfer polymerization; 2) reacting the vinyl terminated polymethacrylate polymer with a nitrogen-containing group in the presence of microwave radiation. 7. The process of claim 6 , where the vinyl terminated polymethacrylate polymer has a molecular weight of about 1000 to about 5000 Mn and is reacted with a nitrogen-containing group.
Assignees
Inventors
Classifications
Specific manufacturing methods for lubricant compositions · CPC title
Internal-combustion engines · CPC title
Detergent property or dispersant property · CPC title
Molecular weight; Molecular weight distribution · CPC title
used as base material · CPC title
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Frequently asked questions
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- What does patent US12168757B2 cover?
- The present invention provides, among other things, a process to produce a low molecular weight dispersant polymethacrylate polymer (“LMWDPMA”), and the LMWDPMA itself, along with the use of the LMWDPMA in a lubricating composition, as well as a method for lubricating an internal combustion engine as disclosed herein.
- Who is the assignee on this patent?
- Lubrizol Corp, Univ Warwick
- What technology area does this patent fall under?
- Primary CPC classification C10M149/00. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Dec 17 2024 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).