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US 5,634,984 AGranted
Method for cleaning an oil-coated substrate
AssigneeUnion Oil Company of California
InventorDonald C. Van Slyke
Life of this patent
Estimating the term…
Abstract
A method for cleaning oil-contaminated substrates employing a composition composed of a diluent oil, a first surfactant having a HLB value of at least 10, and a second surfactant having a higher HLB value. The difference in the HLB values of the first and second surfactants is at least 3 and a mixture of the surfactants would have a HLB value of at least 11.
Claims78
A method for cleaning an oil-coated substrate, the method comprising the sequential steps of:
- (A) contacting at least a portion of the oil-coated substrate with a solution comprising:
- (a) a first surfactant having a HLB value of at least 10;
- (b) a second surfactant having a higher HLB value, where the difference in the HLB values of the first and second surfactants is at least 3 and a mixture of the surfactants has a HLB value of at least 11,
- (c) at least one nonpolar diluent oil;
- and
- (d) less than about 5 volume percent water wherein the volume percent is based on the total amount of surfactant, diluent oil, and water present in the solution;
- and
- (B) rinsing at least a portion of the oil-coated substrate contacted in step (A) with water.
5 more elements
The method of claim 21 where the difference in the HLB values of the first and second surfactants is at least about 5.
A method for cleaning an oil-coated substrate, the method comprising the sequential steps of:
- (A) contacting at least a portion of the oil-coated substrate with a solution comprising:
- (a) at least one nonpolar diluent oil;
- (b) a first polyoxyethylene sorbitan fatty acid ester surfactant having a HLB value of at least 10;
- (c) a second polyoxyethylene sorbitan fatty acid ester surfactant having a higher HLB, where the difference in the HLB values of the first and second surfactants is at least 3, a mixture of the surfactants having a HLB value of at least 11, and the total concentration of such surfactants in the solution is about 5 to about 30 volume percent;
- and
- (d) less than about 5 volume percent water wherein the volume percent is based on the total amount of surfactant, diluent oil, and water present in the solution;
- and
- (B) rinsing at least a portion of the oil-coated substrate contacted in step (A) with water.
5 more elements
A method for cleaning an oil-coated substrate, the method comprising the sequential steps of:
- (A) contacting at least a portion of the oil-coated substrate with a solution comprising:
- (a) a nonpolar diluent oil;
- (b) a first surfactant having a HLB value of at least 10, the first surfactant being selected from the group consisting of polyoxyethylene (20) sorbitan trioleate, polyoxyethylene (20) sorbitan tristearate, and polyoxyethylene (4) sorbitan monolaurate;
- (c) a second surfactant having a higher HLB value, the second surfactant being selected from the group consisting of polyoxyethylene (20) sorbitan monooleate and polyoxyethylene (20) sorbitan monopalmitate, where the difference in HLB values of the first and second surfactants is at least 3, and the total concentration of the surfactants in the solution is about 5 to about 30 volume percent;
- and
- (d) less than about 5 volume percent water wherein the volume percent is based on the total amount of surfactants, diluent oil, and water present in the solution;
- and
- (B) rinsing at least a portion of the oil-coated substrate contacted in step (A) with water.
5 more elements
A method for cleaning an oil-coated substrate, the method comprising the sequential steps of:
- (A) contacting at least a portion of the oil-coated substrate with a composition comprising:
- (a) a nonpolar diluent oil selected from the group consisting of white mineral oils, paraffinic solvents, and mixtures thereof;
- (b) a polyoxyethylene (20) sorbitan trioleate surfactant;
- (c) a polyoxyethylene (20) sorbitan monooleate surfactant, where a mixture of the polyoxyethytene (20) sorbitan trioleate surfactant and the polyoxyethylene (20) sorbitan monooleate surfactant has a HLB value of at least 11 and the combined concentration of the polyoxyethylene (20) sorbitan trioleate and the polyoxyethylene (20) sorbitan monooleate in the solution is about 5 to about 30 volume percent based on the total volume of the surfactants and diluent oils in the solution;
- and
- (B) rinsing at least a portion of the oil-coated substrate contacted in step (A) with water.
3 more elements
A method for cleaning an oil-coated substrate, the method comprising the sequential steps of:
- (A) contacting at least a portion of the oil-coated substrate with a composition comprising:
- (a) a nonpolar diluent oil selected from the group consisting of white mineral oils, paraffinic solvents, and mixtures thereof;
- (b) a polar diluent oil selected from the group consisting of plant oils, animal oils, and mixtures thereof;
- (c) a polyoxyethylene (20) sorbitan trioleate surfactant;
- and
- (d) a polyoxyethylene (20) sorbitan monooleate surfactant, where a mixture of the polyoxyethylene (20) sorbitan trioleate surfactant and the polyoxyethylene (20) sorbitan monooleate surfactant has a HLB value of at least 11 and the combined concentration of the polyoxyethylene (20) sorbitan trioleate and the polyoxyethylene (20) sorbitan monooleate in the solution is about 5 to about 30 volume percent based on the total volume of the surfactants and diluent oils in the solution;
- and
- (B) rinsing at least a portion of the oil-coated substrate contacted in step (A) with water.
5 more elements
A method for cleaning an oil-coated substrate, the method comprising the sequential steps of:
- (A) contacting at least a portion of the oil-coated substrate with a composition comprising:
- (a) a first diluent oil comprising a white mineral oil;
- (b) a second diluent oil comprising d-limonene;
- (c) a first surfactant comprising polyoxyethylene (20) sorbitan trioleate;
- (d) a second surfactant comprising polyoxyethylene (20) sorbitan monooleate, where a mixture of the polyoxyethylene (20) sorbitan trioleate surfactant and the polyoxyethylene (20) sorbitan monooleate surfactant has a HLB value of at least 11 and the combined concentration of the polyoxyethylene (20) sorbitan trioleate and the polyoxyethylene (20) sorbitan monooleate in the composition is about 5 to about 30 volume percent based on the total volume of the surfactants and diluent oils in the composition;
- and
- (B) rinsing at least a portion of the oil-coated substrate contacted in step (A) with water.
4 more elements
A method for cleaning an oil-coated substrate, the method comprising the sequential steps of:
- (A) contacting at least a portion of the oil-coated substrate with a composition comprising:
- (a) a first surfactant having a HLB value of at least 10;
- (b) a second surfactant having a higher HLB value, where the difference in the HLB values of the first and second surfactants is at least 3 and a mixture of the surfactants has a HLB value of at least 11;
- and
- (c) at least one nonpolar diluent oil;
- and
- (B) rinsing at least a portion of the oil-coated substrate contacted in step (A) with water.
4 more elements
A method for cleaning an oil-coated substrate, the method comprising the sequential steps of:
- (A) contacting at least a portion of the oil-coated substrate with a composition comprising:
- (a) a first surfactant having a HLB value of at least 10;
- (b) a second surfactant having a higher HLB value, where the difference in the HLB values of the first and second surfactants is at least 3 and a mixture of the surfactants has a HLB value of at least 11;
- (c) a nonpolar diluent oil;
- and
- (d) a polar diluent oil;
- and
- (B) rinsing at least a portion of the oil-coated substrate contacted in step (A) with water.
5 more elements
A method for cleaning an oil-coated substrate, the method comprising the sequential steps of:
- (A) contacting at least a portion of the oil-coated substrate with a composition comprising:
- (a) at least one nonpolar diluent oil;
- (b) a first polyoxyethylene sorbitan fatty acid ester surfactant having a HLB value of at least 10;
- and
- (c) a second polyoxyethylene sorbitan fatty acid ester surfactant having a higher HLB, where the difference in the HLB values of the first and second surfactants is at least 3, a mixture of the surfactants has a HLB value of at least 11, and the total concentration of such surfactants in the solution is about 5 to about 30 volume percent;
- and
- (B) rinsing at least a portion of the oil-coated substrate contacted in step (A) with water.
4 more elements
A method for cleaning an oil-coated substrate, the method comprising the sequential steps of:
- (A) contacting at least a portion of the oil-coated substrate with a composition comprising:
- (a) a nonpolar diluent oil;
- (b) a polar diluent oil;
- (c) a first polyoxyethylene sorbitan fatty acid ester surfactant having a HLB value of at least 10;
- and
- (d) a second polyoxyethylene sorbitan fatty acid ester surfactant having a higher HLB, where the difference in the HLB values of the first and second surfactants is at least 3, a mixture of the surfactants has a HLB value of at least 11, and the total concentration of such surfactants in the solution is about 5 to about 30 volume percent;
- and
- (B) rinsing at least a portion of the oil-coated substrate contacted in step (A) with water.
5 more elements
A method for cleaning an oil-coated substrate, the method comprising the sequential steps of:
- (A) contacting at least a portion of the oil-coated substrate with a composition comprising:
- (a) a nonpolar diluent oil;
- (b) a first surfactant having a HLB value of at least 10, the first surfactant being selected from the group consisting of polyoxyethylene (20) sorbitan trioleate, polyoxyethylene (20) sorbitan tristearate, and polyoxyethylene (4) sorbitan monolaurate;
- and
- (c) a second surfactant having a higher HLB value, the second surfactant being selected from the group consisting of polyoxyethylene (20) sorbitan monooleate and polyoxyethylene (20) sorbitan monopalmitate, where the difference in HLB values of the first and second surfactants is at least 3, and the total concentration of the surfactants in the composition is about 5 to about 30 volume percent;
- and
- (B) rinsing at least a portion of the oil-coated substrate contacted in step (A) with water.
4 more elements
A method for cleaning an oil-coated substrate, the method comprising the sequential steps of:
- (A) contacting at least a portion of the oil-coated substrate with a composition comprising:
- (a) a nonpolar diluent oil;
- (b) a polar diluent oil;
- (c) a first surfactant having a HLB value of at least 10, the first surfactant being selected from the group consisting of polyoxyethylene (20) sorbitan trioleate, polyoxyethylene (20) sorbitan tristearate, and polyoxyethylene (4) sorbitan monolaurate;
- and
- (d) a second surfactant having a higher HLB value, the second surfactant being selected from the group consisting of polyoxyethylene (20) sorbitan monooleate and polyoxyethylene (20) sorbitan monopalmitate, where the difference in HLB values of the first and second surfactants is at least 3, and the total concentration of the surfactants in the composition is about 5 to about 30 volume percent;
- and
- (B) rinsing at least a portion of the oil-coated substrate contacted in step (A) with water.
5 more elements
Dependencies are inferred from the claim text.