Stabilized blends containing antioxidants

Inactive Publication Date: 2014-04-17
THE LUBRIZOL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0011]The invention provides for the compositions described herein where the turbidity of the overall composition is improved, as defined by visual clarity ratings (such as shown in Tables 1-3 below), or a lower JTU and/or NTU value compared to the same composition that does not contain (c), the stabilizing component.
[0012]The invention provides a process of preparing a clear and stable composition, where the composition includes: (a) a medium comprising a solvent, a functional fluid, or combinations thereof; and (b) an antioxidant component that is not fully soluble in the medium; and (c) a stabilizing component that is soluble in (a) and that interacts with (b) such that (b)'s solubility in (a) is improved, where the method incl

Problems solved by technology

However, many antioxidants may only be used in limited ways due to solubility and/or compatibility issues with the functional fluids in which they are used.
These antioxidants, when used at levels above their solubility and/or compatibility limits, may fall out of the functional fluid composition over time and/or cause the composition to appear hazy or cloudy.
These are serious issues in the manufacturing and blending processes of the fluids as well as in the field.
This stringent standard greatly limits the choices of and available treatment levels for many additives, including the antioxidants discussed herein.
These antioxidants could provide improved performance to a functional fluid but are not widely used and/or are not used at the optimal level because the additive does not meet the solubility

Method used

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  • Stabilized blends containing antioxidants
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Examples

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examples

[0166]The invention will be further illustrated by the following examples, which sets forth particularly advantageous embodiments. While the examples are provided to illustrate the present invention, they are not intended to limit it.

example set 1

[0167]A set of samples is prepared by adding a specific antioxidant known to have compatibility issues to specific mediums. The antioxidant used in this testing is an alkylated phenyl alpha-naphthyl amine (AO-1). The mediums used in this testing include: a polyolefin-based synthetic oil (MEDIUM-1), a mineral oil suitable for various applications including engine oil (MEDIUM-2), and a mineral oil suitable for various applications including greases (MEDIUM-3). The compatibilizers used in this testing include: a nitrogen containing dispersant derived from a 1000 number average molecular weight polyisobutylene succinic anhydride and a polyalkylene polyamine where the dispersant is itself about 15 percent by weight oil (COMPAT-1), a borated nitrogen containing dispersant where the dispersant is derived from a 2000 number average molecular weight polyisobutylene derived succinic anhydride and a mixture of polyalkylene polyamines, where the nitrogen to carbonyl ratio of the dispersant is a...

example set 2

[0171]A second set of samples is prepared by adding a specific antioxidant known to have compatibility issues to specific mediums. The antioxidant used in this testing is a sterically hindered phenolic antioxidant commercially available from BASF (AO-2). The medium used in this testing is a dialkyl diphenyl ether suitable for various applications including specially grease applications (MEDIUM-4). The compatibilizers used in this testing include: COMPAT-3 described above, a quaternary ammonium salt derived from a 1000 number average molecular weight polyisobutylene derived succinic anhydride and a polyalkylene polyamine, quaternized using an alkylene epoxide in combination with an acid (COMPAT-4), a borated nitrogen containing dispersant where the dispersant is derived from a 1000 number average molecular weight polyisobutylene derived succinic anhydride and a mixture of polyalkylene polyamines, where the nitrogen to carbonyl ratio of the dispersant is about 2 and the molar ratio of...

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Abstract

The present invention relates to functional fluid compositions containing antioxidants, and specifically stable compositions containing antioxidants with limited solubility in and/or limited compatibility with the functional fluids with which they are used. In particular the present invention deals with functional fluids used in internal combustion engines, such as engine oils, and antioxidants containing a phenolic or benzoic group, where the antioxidant is present in the functional fluid composition at levels that would otherwise cause the composition to be unstable and/or hazy.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to functional fluid compositions containing antioxidants, and specifically stable compositions containing antioxidants with limited solubility in and / or limited compatibility with the functional fluids with which they are used.[0002]Antioxidants and their importance to various types of functional fluids are known. However, many antioxidants may only be used in limited ways due to solubility and / or compatibility issues with the functional fluids in which they are used. Many antioxidants, including phenolic or benzoic antioxidants, have limited solubility in functional fluids, such as engine oils, gear oils and greases. These antioxidants, when used at levels above their solubility and / or compatibility limits, may fall out of the functional fluid composition over time and / or cause the composition to appear hazy or cloudy.[0003]These are serious issues in the manufacturing and blending processes of the fluids as well as in ...

Claims

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Application Information

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IPC IPC(8): C09K8/64C10L1/24C10L1/26C10M141/12C10L1/222
CPCC09K8/64C10M141/12C10L1/2437C10L1/2658C10L1/2222C10L1/1824C10L1/223C10L1/224C10L1/303C10M141/06C10M171/00C10M2203/1006C10M2205/0285C10M2207/026C10M2207/0406C10M2207/144C10M2215/04C10M2215/064C10M2215/065C10M2215/08C10M2215/28C10M2219/046C10M2223/043C10M2227/061C10N2020/04C10N2020/06C10N2030/10C10N2030/52C10N2030/70C10N2040/04C10N2040/08C10N2040/135C10N2040/20C10N2040/25C10N2040/26C10N2050/015C10N2050/10C10N2010/04C10N2060/06C10N2060/14C10L1/18C10L1/1832C10L1/22C10L1/221C10L1/24C10L1/26C10L1/30C10L10/18C10L2230/081C10L2290/24C10M163/00C10M2203/024C10M2207/023C10M2227/06
Inventor IVANCIC, DANIELLE N.BURRINGTON, JAMES D.DELBRIDGE, EWAN E.
Owner THE LUBRIZOL CORP
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