A small pilot‐plant batch process for the encapsulation of pesticides with crosslinked starch xanthate (starch xanthide) has been developed. Multipound quantities of several encapsulated pesticides have been prepared that have slow‐release properties. Products were made from starch xanthates of varying degrees of substitution (0.1 to 0.3) and with various crosslinking agents (H2O2, NaNO2, NaOCl, NaClO2, and FeCl3). Recovery of the pesticides as the encapsulated product ranged from 62% to nearly 100%. In a single experiment, processing water was recycled without apparent problems.
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Stout et al. (1979) studied this question.
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