초록 ▼

A rust stain removal formula using fluoboric acid as the active ingredient and a method of making same. The inventive formula does not etch glazed, glass or enamel surfaces to which the formula is applied. Further, the inventive formula reduces other problems caused by the hydrofluoric acid used as

A rust stain removal formula using fluoboric acid as the active ingredient and a method of making same. The inventive formula does not etch glazed, glass or enamel surfaces to which the formula is applied. Further, the inventive formula reduces other problems caused by the hydrofluoric acid used as the active ingredient in prior art rust stain removal formulas. The formula is initially formed by adding ammonium bifluoride, and then boric acid to a solution of heated water. Oxalic acid is then added. The ammonium bifluoride reacts with the boric acid to form fluoboric acid. Optional ingredients such as a thickener and perfume may also be included in the inventive rust stain removal formula.

대표청구항 ▼

[ What is claimed is:] [1.]1. A composition for removal of rust stains, said composition comprising:about 1 to 5 percent by weight of ammonium bifluoride;about 1 to 5 percent by weight of boric acid;about 1 to 5 percent by weight of oxalic acid; andfluoboric acid, said fluoboric acid formed by react

[ What is claimed is:] [1.]1. A composition for removal of rust stains, said composition comprising:about 1 to 5 percent by weight of ammonium bifluoride;about 1 to 5 percent by weight of boric acid;about 1 to 5 percent by weight of oxalic acid; andfluoboric acid, said fluoboric acid formed by reaction of said ammonium bifluoride with said boric acid;the remainder of said composition being substantially water and, optionally, one or both of a surfactant and a thickening agent. [7.]7. A method of treating rust stains comprising the following steps:(a) combining a predetermined amount of ammonium bifluoride with water in a container and dissolving the ammonium bifluoride;(b) after step (a), adding a predetermined amount of boric acid to the container;(c) mixing the contents of the container, whereby the boric acid and the ammonium bifluoride react to form a formula including fluoboric acid; and(d) applying the formula to an article having a rust stain thereon, said formula removing at least a portion of the rust stain.