Phosphonium Salts
Phosphonium salts are prepared by direct quaternization of a
tertiary alkylphosphine with an alkly chloride, bromide or
iodide or in many cases with reactive esters such as
alkylsulfonates, sulfates or phosphates. Cytec markets such
products under the CYPHOS® trade name (see
Table). They
have high thermal stabilities and are used in a wide variety
of applications such as phase transfer catalysts (PTCs), epoxy
curing catalysts, anti-stats, plasticizers and biocides. The
longer chain alkylphosphines are also used to exfoliate clays
to render them compatible with polymers and monomers as
described under “Functional Applications of Alkylphosphine
Derivatives”.
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