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AssigneeHatco Corporation
InventorsMichael A. McHenry, Dale D. Carr, Jeremy P. Styer
Estimating the term…
A novel biodegradable polyneopentyl polyol (PNP) ester based synthetic ester basestock that includes a PNP ester admixed with a dicarboxylic acid ester coupling agent is provided. The PNP ester-coupling agent mixture is blended further with minor amounts of a single, or mixture of, additional high molecular weight linear or branched chain ester. The final basestocks are compatible with standard lubricant additive packages and miscible with gasoline to provide biodegradable lubricants that have improved viscosity characteristics, good low temperature properties, and improved lubricity for 2-stroke engine lubricant applications.
A biodegradable 2-stroke engine lubricant basestock composition, comprising:
A biodegradable 2-stroke engine lubricant basestock composition comprising:
A method of lubricating a 2-stroke engine which comprises contacting moving components of the engine to be lubricated with an effective amount of a synthetic lubricant including a basestock, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Containing oxygen: esters
Of aliphatic oolycarboxylic acids: used as base material
Of polyhydroxy compounds: used as base material
Of polymerised unsaturated acids: used as base material
Term ended 5 Jan 2021 (estimated)
This invention relates generally to synthetic ester basestock blends based on polyneopentyl polyol (“PNP”) esters and, more particularly, to basestocks including PNP esters mixed with a coupling agent to increase compatibility with standard lubricant additive packages and provide a highly biodegradable lubricant formulation suitable for use in 2-stroke engines.
There is a continuing need to provide lubricant compositions which are highly biodegradable and are fully miscible with gasoline. This is particularly true with respect to lubricants for 2-stroke engines. These engines are often small gasoline engines used in recreational vehicles, such as motorboats, mono-skis for water use, snowmobiles and in lawn equipment. Thus, all such uses are in sensitive environments subject to pollution. Absent an acceptable biodegradabability level, exhaust and leakage of fuel mixed with the lubricant would tend to pollute forests, rivers, lakes and other waterways.
In order for lubricants for 2-stroke engines to be acceptable, they must provide a high viscosity index, acceptable biodegradability, miscibility with gasoline and be compatible with standard lubricant additive packages. Suitable viscometrics include good cold flow properties, such as a pour point less than about −40° C. and a viscosity at −40° C. of less than 36,000 cps and a suitably high flash point, greater than about 240° C.
To a reactor as described above was charged pentaerythritol (1.68 moles), heptanoic acid (2.46 moles), C8-C10 acid (0.34 moles) and a strong acid catalyst as described in Leibfried.
The mixture was heated to a temperature of about 190° C. and water of reaction was removed and collected in the trap. Vacuum was applied at temperature to obtain a reflux thereby removing the water and returning the acid collected in the trap to the reactor.
The viscosity of the reaction mixture was monitored and when the desired viscosity was obtained an amount of alkali was added to the reactor to neutralize the acid catalyst. At this point the reaction mixture consists of partial esters of pentaerythritol, dipentaerythritol, tripentaerythritol, tetrapentaerythritol, etc.