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. 28, 1998
Filed:
Feb. 18, 1997
Tamara V Vyshkina, Brooklyn, NY (US);
Other;
Abstract
A flocculant copolymer of acrylamide and Mannich base of acrylamide is provided which purifies and treats water and/or waste water, and/or sludge, and/or other contaminated liquids resulting from municipal discharges and industrial process effluents, as well as separating suspended and colloidal particles from liquids in industrial manufacturing processes. The copolymer has the general formula: ##STR1## wherein R.sub.1 is hydrogen or C.sub.1-4 alkyl groups, R.sub.2 and R.sub.3 are C.sub.1 to C.sub.8 alkyl groups and may be the same or different. It is prepared in two stage reaction. In the first stage Mannich base of acrylamide is produced by reacting acrylamide with formalin and dimethylamine or other secondary C.sub.1-8 -alkylamines: ##STR2## and in the second stage copolymer of acrylamide and Mannich base of acrylamide is produced by polymerizing in the presence of redox-initiator system. The mole ratio of acrylamide to Mannich base of acrylamide of 1:(0.05-0.1) is preferred to obtain the copolymer which does not significantly cross-link.