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US 4,859,352 AGranted
Low temperature high performance grease
AssigneeAmoco Corporation
InventorJohn A. Waynick
Life of this patent
Estimating the term…
Abstract
A high performance grease is provided that performs well at extremely cold temperatures and moderately elevated temperatures, as well as under normal operation conditions. The high performance grease comprises: a lithium soap thickener, a synthetic base oil blend of diester and polyalphaolefin, and extreme pressure antiwear additives and inhibitors comprising dithiocarbamates, phosphates, and hydroxides.
Claims12
A grease, comprising:
- from about 65% to about 93% by weight of oil consisting of a synthetic base oil blend in the absence of mineral oil, said synthetic oil blend comprising from about 5% to about 75% polyalphaolefin based upon the total weight of said synthetic base oil blend and from about 25% to about 95% of an aliphatic diester of an aliphatic dicarboxylic acid based upon the total weight of said synthetic oil blend;
- from about 5% to about 20% by weight of a lithium 12-hydroxystearate soap thickener;
- and
- from about 2% to about 15% by weight of a low temperature compatible additive package comprising at least one member selected from the group consisting of a dithiocarbamate-containing compound, a phosphate-containing compound, a lithium hydroxide-containing compound, and a calcium hydroxide-containing compound.
1 more element
A grease, comprising:
- from about 65% to about 93% by weight of a synthetic oil comprising from about 5% to about 75% polyalphaolefin based upon the total weight of said synthetic oil and from about 25% to about 95% diester oil based upon the total weight of said synthetic oil;
- from about 5% to about 20% by weight of a thickener comprising lithium 12-hydroxystearate;
- from about 2% to about 15% by weight of an additive package comprising a dithiocarbamate-containing compound, a phosphate-containing compound, hydroxide-containing compounds, a corrosion inhibitor, an oxidation inhibitor, and a metal deactivator;
- and
- said synthetic oil, said thickener and said additive package being effective to impart ultralow temperature properties to said grease.
2 more elements
A grease comprising:
- from about 71% to about 88% by weight of a synthetic oil blend, said synthetic oil blend comprising by weight, based upon the total weight of said synthetic oil blend, from about 15% to about 70% polyalphaolefin and from about 30% to about 85% aliphatic diester of an aliphatic dicarboxylic acid;
- from about 8% to about 17% by weight lithium 12-hydroxystearate thickener;
- and
- from about 4% to about 12% by weight of a blend of additives for imparting extreme pressure antiwear properties to the grease and for substantially inhibiting oil separation and corrosion of copper and iron, said blend of additives comprising by weight, based upon the total weight of said blend of additives
- from about 20% to about 42% of a dithiocarbamate compound comprising a member selected from the group consisting of alkylene bis dithiocarbamate, arylene bis dithiocarbamate, alkyl arylene bis dithiocarbamate, and methylene bis dithiocarbamate;
- from about 20% to about 42% aryl phosphate;
- from about 1% to about 5% hydroxide compounds, said hydroxide compounds comprising by weight based upon the total weight of said hydroxide compounds, from about 20% to about 60% calcium hydroxide and from about 40% to about 80% of a lithium hydroxide-containing compound comprising a member selected from the group consisting of lithium hydroxide and lithium hydroxide monohydrate;
- and
- from about 6% to about 18% alkaline earth metal alkyl sulfonate;
- and
- said synthetic oil blend, said lithium 12-hydroxystearate thickener and said blend of additives enhancing the performance and lubricity of the grease at temperatures as low as at least about -100.degree. F. and as high as at least about +250.degree. F.
8 more elements
Dependencies are inferred from the claim text.