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. 28, 1980
Filed:
May. 22, 1978
Lawrence A Mura, Homewood, IL (US);
Nalco Chemical Company, Oak Brook, IL (US);
Abstract
Water-in-oil emulsions of polyacrylamide or other water soluble vinyl addition polymers having amide functionality can be reacted with formaldehyde and a secondary amine containing 2-8 carbon atoms followed by quaternization to prepare water-in-oil emulsions of quaternized cationically modified polyacrylamides. The resultant water-in-oil emulsions are stabilized against cross linking by the addition to the water-in-oil emulsions of an aqueous solution of a water soluble phosphorous compound having a P--H bond. The phosphorous containing compound is added in such a quantity so as to provide from 1.6-25% by weight of the phosphorous compound based on the weight of the polymer contained within the water-in-oil emulsion and to simultaneously adjust the pH of the water-in-oil emulsion to a range of between 3.5-5.0. The stabilized water-in-oil emulsions can be readily inverted into aqueous solution causing the solubilization of the polymer in the aqueous without the need for heating the water-in-oil emulsion at high temperatures for extended periods of time.