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:
Oct. 19, 1976
Filed:
Jun. 07, 1974
Donald Henry Foelsch, Williamsport, PA (US);
Glyco Chemicals, Inc., Greenwich, CT (US);
Abstract
Disclosed is (i) an aqueous solution containing from about 45 to 70% of 1,3-dimethylol-5,5-dimethylhydantoin, having from a maximum of 1.25% to no free formaldehyde, with at least 96.5% of its solute being that dimethylol dimethylhydantoin and having pH from about 7.6 to 7, and (ii) the preparation of that solution by admixing formaldehyde and 5,5-dimethylhydantoin in the ratio from about 1.85 to 2.4 mols of formaldehyde per mol of the dimethylhydantoin in water, adjusting the pH with a compatible alkalizing agent to enable conducting the reaction at a pH of at least 7 to about 9, and allowing the reactants to react at a temperature from about 22.degree. to 65.degree. C. and a pH from 9 to 7 for a time sufficient for the formation of the 1,3-dimethylol-5,5-dimethylhydantoin to be substantially completed. The solution is useful as a formaldehyde donor and for a preservative in various pastes, soaps, skin creams and liquid shampoos.