Cross-linked lignin gels

Details Cross-linked lignin gels Cross-linked lignin gels

A - Human Necessities

01

N

167/3, 134/53

A01N 25/00 (2006.01) A01N 25/10 (2006.01) C08H 6/00 (2010.01)

Patent

CA 1079629

Abstract of the Disclosure 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 1000 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.

269890

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