| abstract |
Precipitation polymerization process and copolymer products produced thereby. The process is carried out by charging a reactor with a solvent in which the copolymer product is insoluble on the whole range of copolymer compounds, preferably heptane or cyclohexane, and with a polymerization initiator. , by heating between 50 ° and 150 ° C, by stirring and then by simultaneous delivery of selected quantities of a vinyl lactam and of a polymerizable carboxylic acid in said reactor below the surface of the solvent, while continuing to stir mixing in order to precipitate the copolymer drawn from a solution, in the form of a fine white powder, and to recover the copolymer of the defined composition. |