Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1978-05-22
1980-10-28
Michl, Paul R.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C08K 551
Patent
active
042306086
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.
REFERENCES:
patent: 2516980 (1950-08-01), Gray
patent: 4010131 (1977-03-01), Phillips
patent: 4120840 (1978-10-01), Hurlock
J. F. Walker, "Formaldehyde", Reinhold Pub., London, pp. 256-257, 1964.
K. Moedritzer et al., "J. Am. Chem. Soc.", vol. 31, May 1966, pp. 1603-1607.
Michl Paul R.
Miller Robert A.
Nalco Chemical Company
Premo John G.
Roberts, Jr. John S.
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