The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 01, 1980
Filed:
Sep. 27, 1977
Felix B Popper, Nashua, NH (US);
Jeremiah B McCarthy, Nashua, NH (US);
James R Hart, Merrimack, NH (US);
W. R. Grace & Co., New York, NY (US);
Abstract
An aqueous solution of a chelate of: (a) at least one metal selected from a first group consisting of: (i) magnesium; (ii) calcium; (iii) zinc; and (iv) manganese (II); and (b) at least one chelating agent selected from a second group consisting of moieties of: (i) ethylenediaminetetraacetic acid; (ii) nitrilotriacetic acid; (iii) diethylenetriaminepentaacetic acid; and (iv) hydroxyethylethylenediaminetriacetic acid is prepared by a process comprising forming a first admixture by admixing in an aqueous system an oxide or hydroxide of at least one member of the first group and at least one member selected from a third group consisting of a tetraalkali metal salt of ethylenediaminetetraacetic acid, a trialkali metal salt of nitrilotriacetic acid, a pentaalkali metal salt of diethylenetriaminepentaacetic acid, and a trialkali metal salt of hydroxyethylethylenediaminetriacetic acid; forming a second admixture by admixing the first admixture and a nitrile selected from a fourth group consisting of ethylenediaminetetraacetonitrile, nitrilotriacetonitrile, and diethylenetriaminepentaacetonitrile, and heating the second admixture to form the chelate and evaporate by-product ammonia therefrom, the pH of the resulting substantially ammonia-free product can then be adjusted to about 5-9.5 or preferably 6-9 if it is not already within this pH range.