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:
May. 05, 1981
Filed:
Sep. 10, 1979
Charles J McDonald, Midland, MI (US);
Robert H Beaver, Antioch, CA (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
In a process for preparing a N-substituted derivative of a carboxamide, the conversion of carboxamide to the derivative is determined by carbon-13 nuclear magnetic resonance analysis (CMR) wherein the intensities of the carbonyl carbon peaks attributable to the carboxamide and the derivative are measured under conditions of magnetic resonance and the mole ratio of carboxamide to derivative is determined by comparing the intensities of said carbonyl carbon peaks. For example, in the reaction of polyacrylamide with a secondary amine such as dimethylamine and formaldehyde, the conversion of the polyacrylamide to its N-(dimethylaminomethyl) derivative is determined by subjecting the sample to CMR analysis and comparing the intensities of the carbonyl carbon peaks of the polyacrylamide and the N-(dimethylaminomethyl) derivative.