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US 8,969,279 B2Granted
Solvent systems having no flash point and methods using such solvent systems for dissolving rigid polyurethane foams
AssigneeAlbemarle Corporation
InventorHisashi Miwa
Life of this patent
Estimating the term…
Abstract
This invention relates to solvent systems useful for foam nozzle cleaning, which solvent systems are formed by combining at least a brominated compound, an alcohol and a stabilizer in amounts such that the solvent system has no flash point.
Claims11
A solvent system produced by combining components consisting essentially of:
- (a) from about 20 wt % to about 90 wt % of a brominated compound, (b) from about 10 wt % to about 80 wt % of an alcohol consisting of a primary alcohol and/or a secondary alcohol, and (c) from about 0.05 wt % to about 6.0 wt % of a stabilizer consisting essentially of an epoxide, a nitroalkane, and/or an ether, wherein the amounts of the brominated compound, the alcohol, and the stabilizer are selected so that the solvent system has no flash point and when used for removing polyurethane foam from a surface produces a used solvent having essentially no gel formation.
A solvent system produced by combining components consisting essentially of:
- (a) from about 20 wt % to about 90 wt % of n-propyl bromide, (b) from about 10 wt % to about 80 wt % of 1-propanol and/or 2-butanol, and (c) from about 0.05 wt % to about 6.0 wt % of a stabilizer consisting essentially of (i) 1,2-epoxybutane and/or (ii) nitromethane and/or nitroethane, wherein the amounts of the n-propyl bromide, the 1-propanol and/or 2-butanol, and the stabilizer are selected so that the solvent system has no flash point and when used for removing polyurethane foam from a surface produces a used solvent having essentially no gel formation.
A process for cleaning polyurethane foam from an article, said process consisting essentially of:
- (i) contacting the polyurethane foam with a solvent system produced by combining components consisting essentially of:
- (a) from about 20 wt % to about 90 wt % of a brominated compound, (b) from about 10 wt % to about 80 wt % of an alcohol consisting of a primary alcohol and/or a secondary alcohol, and (c) from about 0.05 wt % to about 6.0 wt % of a stabilizer consisting essentially of an epoxide, a nitroalkane, and/or an ether, wherein the amounts of the brominated compound, the alcohol, and the stabilizer are selected so that the solvent system has no flash point and when used for removing the polyurethane foam from the article produces a used solvent having essentially no gel formation;
- and
- (ii) thereby producing the used solvent, wherein there is essentially no gel formation in the used solvent.
1 more element
A process for cleaning polyurethane foam from an article, said process consisting essentially of:
- (i) contacting the polyurethane foam with a solvent system produced by combining components consisting essentially of:
- (a) from about 20 wt % to about 90 wt % of n-propyl bromide, (b) from about 10 wt % to about 80 wt % of an alcohol consisting essentially of 1-propanol and/or 2-butanol, and (c) from about 0.05 wt % to about 6.0 wt % of a stabilizer consisting essentially of (i) 1,2-epoxybutane and (ii) nitromethane and/or nitroethane, wherein the solvent system has no flash point and when used for removing the polyurethane foam from the article produces a used solvent having essentially no gel formation;
- and
- (ii) thereby producing the used solvent, wherein there is essentially no gel formation in the used solvent.
1 more element
Dependencies are inferred from the claim text.