SYMPOSIA PAPER Published: 01 January 1993
STP25122S

Pyrethroid Microemulsions

Source

A system containing a polyarylphenolethoxylate as the nonionic surfactant, and a calcium dodecylbenzenesulfonate in alcohol as the anionic surfactant and co-surfactant respectively, was used to study microemulsions of Permethrin and Cypermethrin (common insecticides of the important Pyrethroids class).

The influence of co-surfactant chain length was investigated employing phase diagrams. The results obtained with this pseudo-quaternary system of technical products are compared with those found for more basic systems and theoretical studies predicting a strong influence of slight co-surfactant chain length reduction.

Besides providing a good understanding of the phase behavior, phase diagrams offer a complete picture of the different microemulsions likely to be formulated with the described system, thus offering a large choice of formulations meeting specific application requirements. An example of such an approach is given, with the optimization of both 10 and 25 % Permethrin microemulsions.

Author Information

Rebmann, V
Witco S. A., Saint Pierre lès Elbeuf, France
Fiquet, L
Witco S. A., Saint Pierre lès Elbeuf, France
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Details
Developed by Committee: E35
Pages: 30–44
DOI: 10.1520/STP25122S
ISBN-EB: 978-0-8031-5238-0
ISBN-13: 978-0-8031-1888-1