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:
Sep. 20, 1977
Filed:
Jul. 16, 1976
Wood E Hunter, Lombard, IL (US);
Theodore P Sieder, Sauk Village, IL (US);
Nalco Chemical Company, Oak Brook, IL (US);
Abstract
Cationically modified polymers of acrylamide are prepared by adding to a polyacrylamide an aqueous solution of a lower aliphatic aldehyde followed by a lower alkyl secondary amine. The pH of the dilute solution of the acrylamide polymer which is reacted is adjusted prior to addition of the aldehyde to between 4.5 and 5.5 thereby conducting this reaction at an acidic pH. Additionally, quaternized polymers may be prepared by adding to the cationically modified polyacrylamide a lower alkyl halide quaternizing agent. The pH of the solution of the cationically modified acrylamide polymer prior to quaternization should be 7.5-8.5.