Stabilized blends containing antioxidants
AssigneeThe Lubrizol Corporation
InventorsDanielle N. Ivancic, James D. Burrington, Ewan E. Delbridge
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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.
Claims11
An additive concentrate composition comprising:
- (a) a medium comprising a solvent, a functional fluid, or combinations thereof;
- and
- (b) at least 10 wt % of an antioxidant component that is not fully soluble in the medium, wherein said antioxidant comprises:
- an alkylated diphenyl amine antioxidant, an alkylated phenyl-naphthyl amine antioxidant, or a combination thereof;
- and
- (c) at least 20 wt % of a stabilizing component that is soluble in (a) and that interacts with (b) such that (b)'s solubility in (a) is improved, wherein said stabilizing component comprises:
- (i) a nitrogen-containing dispersant derived from a 1000 number average molecular weight polyisobutylene succinic anhydride and polyalkylene polyamines;
- (ii) a borated nitrogen-containing dispersant derived from a 2000 number average molecular weight polyisobutylene derived succinic anhydride and polyalkylene polyamines;
- (iii) a trialkyl borate, or combinations thereof;
- and
- wherein components (b) and (c) are present in component (a) in the form of dispersed particles having an average diameter of less than 10 microns.
A process of preparing a clear and stable additive concentrate composition comprising:
- (a) a medium comprising a solvent, a functional fluid, or combinations thereof;
- and
- (b) at least 10 wt % of an antioxidant component that is not fully soluble in the medium, wherein said antioxidant comprises:
- an alkylated diphenyl amine antioxidant, an alkylated phenyl-naphthyl amine antioxidant, or a combination thereof;
- and
- (c) at least 20 wt % of a stabilizing component that is soluble in (a) and that interacts with (b) such that (b)'s solubility in (a) is improved, wherein said stabilizing component comprises:
- (i) a nitrogen-containing dispersant derived from a 1000 number average molecular weight polyisobutylene succinic anhydride and polyalkylene polyamines;
- (ii) a borated nitrogen-containing dispersant derived from a 2000 number average molecular weight polyisobutylene derived succinic anhydride and polyalkylene polyamines;
- (iii) a trialkyl borate, or combinations thereof;
- and;
- said method comprising the steps of:
- I. adding components (b) and (c) to component (a);
- II. mixing the components so that particles of components (b) and (c) have an average diameter of less than 10 microns.
Dependencies are inferred from the claim text.