Method of laundering industrial garments
AssigneeWashing Systems, LLC
InventorsMatt Praechter, Roy Praechter, Dave Tibbitts
Life of this patent
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Abstract
Metallic based oily soils can be removed from garments by subjecting the garments to a pre-wash in an aqueous solution of a hydroxy diphosphonic acid such as HEDP under acidic conditions. Pre-washing the garments in the aqueous solution of HEDP at about 100 to 212 degrees Fahrenheit for about 15 minutes effectively removes the greasy soils, allowing them to be further laundered with an alkaline detergent composition.
Claims6
A method of laundering garments having metallic-based oily soil including a hydrocarbon portion and at least one of metal particles and metal oxide particles comprising prewashing said garments in an aqueous solution of 1-hydroxy ethylidene-1, 1-diphosphonic acid at about 100° F. to about 212° F. at a pH of 3-5 for a time effective to cause removal of metallic based oily soils and subsequently washing said garments in an alkaline detergent solution;
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- wherein said aqueous solution of 1-hydroxy ethylidene-1, 1-diphosphonic acid does not include any of alkaline components, detergent builders, anionic surfactant, cationic surfactants or bleach in amounts sufficient to effect said garments during laundering.
Dependencies are inferred from the claim text.