Chemistry: fertilizers – Processes and products – Forms or conditioning
Patent
1976-02-03
1981-01-13
Hollrah, Glennon H.
Chemistry: fertilizers
Processes and products
Forms or conditioning
71 79, 71115, 71116, 71117, 71DIG1, A01N 2504
Patent
active
042447283
ABSTRACT:
Disclosed herein are cross-linked lignin gels which have been found useful as pesticide carriers in controlled release pesticide systems. The carrier is a highly reswellable cross-linked lignin gel prepared by reacting alkali lignin with from 1 mole to 10 moles of cross-linking agent, such as formaldehyde, per 1,000 grams of lignin. An aqueous solution of lignin and the cross-linking agent is reacted at elevated temperatures until cross-linking occurs to the point where a discernible increase in viscosity takes place and the gel is formed. The gels are allowed to dehydrate, and the pesticide in an amount from 0.1:1.0 to 2:1 (pesticide to carrier) is included by reswelling the dehydrated gel in an aqueous solution of the pesticide.
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Dellicolli Humbert T.
Dilling Peter
Falkehag Sten I.
Hollrah Glennon H.
Lipscomb III Ernest B.
McDaniel Terry B.
Schmalz Richard L.
Westvaco Corporation
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