Patents by Inventor Stanley E. Krahler

Stanley E. Krahler has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Manufacture of chloromethyl-substituted polyfluoroalkyl esters
    Patent number: 4517376
    Abstract: Compounds having the formula: ##STR1## wherein R.sub.f is perfluorinated saturated aliphatic containing 3-20 carbons;R.sup.1 is optionally substituted alkyl, aryl, aralkyl or cycloalkyl; andn is a number from 1 to 4.Process for preparing compounds (I): ##STR2## The reaction can be carried out, e.g., by melting an iodine-substituted polyfluoroalkyl ester and contacting the molten ester with chlorine, or an iodine-substituted polyfluoroalkyl ester can be suspended or dissolved in a suitable liquid and reacted with chlorine. A suitable liquid is inert under the reaction conditions; e.g. alcohols or water should be avoided. Process of using compounds (I) to treat (a) textile materials so as to give them dry soil resistance and oil and water repellency, and (b) paper so as to make it repel water and oil.
    Type: Grant
    Filed: August 23, 1982
    Date of Patent: May 14, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Stanley E. Krahler, William R. Remington
  • Iodopentahydroperfluoroalkyl borates
    Patent number: 4489006
    Abstract: 2-Iodo-1,1,2,3,3-pentahydroperfluoroalkyl borates, their preparation from perfluoroalkyl iodides and triallyl borate in the presence of a free radical initiator, and preparation of perfluoroalkylpropylene iodohydrins by hydrolysis of the borates.
    Type: Grant
    Filed: April 12, 1984
    Date of Patent: December 18, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Stanley E. Krahler