Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1997-02-18
1998-04-28
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526 80, C08F22602, C08F 210
Patent
active
057445630
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.
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Cheng Wu C.
Schofer Joseph L.
Stone Robert L.
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