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:
Apr. 10, 2012
Filed:
Nov. 18, 2008
Axel Hans-joachim Herzog, West Chester, PA (US);
Hollis Thomas Warren, Newark, DE (US);
Brent Ryan Gonska, Wilmington, DE (US);
Axel Hans-Joachim Herzog, West Chester, PA (US);
Hollis Thomas Warren, Newark, DE (US);
Brent Ryan Gonska, Wilmington, DE (US);
E.I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
The present invention provides a method of making sulfur containing fluoroalkyl amines which overcomes the problems of previously known methods. Sulfur containing fluoroalkyl amines are useful as intermediates for compounds which are in turn useful for imparting water and oil repellency to textiles. Sulfur containing fluoroalkyl amines used in this manner may be found in Example 8 of Rondestvedt et al. (U.S. Pat. No. 3,655,732) wherein they are made by reacting an iodo-fluoroalkyl with an aminoalkyl thiol. Specifically, Rondestvedt et al. teaches reacting CF(CF)(CH)I (an iodo-fluoroalkyl) with HS—CHCH—NH(an aminoalkyl thiol) to make CF(CF)(CH)—S—CHCH—NH(a sulfur containing fluoroalkyl amine). Unlike previously known methods, the method of the present invention can achieve higher yields of sulfur containing fluoroalkyl amines without resorting to costly solvents. Furthermore, unlike previously known methods, the method of the present invention can produce oxidized forms of sulfur containing fluoroalkyl amines wherein the sulfur atom thereof is oxidized.