Surfactant-free latexes


Jutta Rieger, François Stoffelbach

The laboratory owns a recognized expertise in the radical polymerization in dispersed media. The latexes – obtained by innovative or classical procedures- are destined to various applications such as PSA production (pressure sensitive adhesives), in cosmectics, as reinforcing additives, or to encapsulate olfactive molecules.

On top of classical techniques (radical polymerization in presence of surfactant), we are interested in using the PISA approach to procude self-stabilised latexes, without free-surfactant. Indeed, the presence of free surfactant resulting from the drying of latexes can have negative effects on the barrier properties or the resistance of films towars water vapor.The PISA technology pushed at its limits (use of very low percentages in reactive polymer) present a real interest for industry. We have shown that it was possible to reduce the concentration of the macroRAFT agent (typically < 2 wt%). In this case, it is not a real PISA process anymore, rather than a conventional radical emulsion polymerization where the stabilizer (amphiphilic block copolymers) is created in situ during polymerization.