Solvent with alicyclic carbonate and ethylene dipropionate
AssigneeThe Boeing Company
InventorPatrisha A. Doscher-Good
Life of this patent
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Abstract
A cleaning solvent having an extended shelf life includes ethylene dipropionate, and at least one alicyclic carbonate, preferably propylene carbonate, with or without other additives. Typically additives include triethanolamine (TEA) and N-methyl-2-pyrrolidone (NMP). The solvents may be diluted with water for cleaning tasks where control of corrosion is not an important consideration.
Claims9
A solvent having extended shelf life comprising a mixture of an one volume of ethylene carbonate, about the same volume of propylene carbonate, and about two volumes of ethylene dipropionate, further comprising about 5-10 vol % triethanolamine wherein the volume % triethanolamine is based on the combined volumes of the two carbonates and the dipropionate.
The solvent claim 5 wherein the mixture is diluted with water.
The solvent of claim 5 further comprising an effective amount of nonionic wetting agent.
A method of cleaning debris from a substrate comprising the step of contacting the debris with the solvent of claim 5.
A solvent having enhanced shelf life, comprising:
- an effective amount of an alicyclic carbonate selected from the group consisting of ethylene carbonate, propylene carbonate, or mixtures thereof;
- substantially an equivolume of ethylene dipropionate;
- 5-10 vol % triethanolamine;
- 5-10 vol % N-methyl-2-pyrrolidone;
- and
- 5-10 vol % of a nonionic wetting agent,
- wherein the volume % of the triethanolamine, N-methyl-2-pyrrolidone, and wetting agent are measured relative to the combined volume of the alicyclic carbonate and dipropionate.
Dependencies are inferred from the claim text.