METHOD OF PRODUCING SULPHUR-CONTAINING POLYACRYLAMIDE DERIVATIVES Russian patent published in 2012 - IPC C08F265/10 C08F20/56 C08F8/28 C08F8/34 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing a sulphur-containing polyacrylamide derivative, having in three types of elementary units in the macrochain:

, , , in ratio of 1:2:2, by reacting a carboxylic acid amide with hydrogen sulphide-saturated aqueous solution of formaldehyde with ratio amide:H₂S:CH₂O=1:2:3 in an aqueous medium, characterised by that the carboxylic acid amide used is an atactic polyacrylamide in form of 1% aqueous solution; the reactants react at 20-30°C for 20-25 hours; the product is extracted by neutralising the reaction mixture with hydrochloric acid to a neutral medium, followed by precipitation of the product with ethyl alcohol with volume ratio of the reaction mixture to alcohol equal to 1:3, while adding concentrated sodium chloride solution which is used as a coagulant, washing the precipitate with 70% ethyl alcohol solution and drying the washed precipitate.

EFFECT: simple method.

2 ex