Base-triggered release microcapsules
First Claim
1. A microcapsule formed of an aminoplast shell wall and an encapsulated ingredient or ingredients enclosed within the wall, the wall having been produced by a microencapsulation process comprising reacting an etherified amino resin prepolymer with a cross-linking agent wherein said cross-linking agent is the ester or thioester reaction product of (a) a multifunctional alcohol selected from the group consisting of pentaerythritol, dipentaerythritol, tripentaerythritol, trimethylolpropane, glycerol, 3-mercaptopropane-diol, 1,2,4-butanetriol, 1,3,5-cyclohexanetriol, 1,2,3-heptanetriol and sorbitol, and (b) one or more 2-(hydroxy) and/or 2-(thiol) C2-C6 alkanoic acids, wherein the resulting ester and/or thioester groups are capable of being cleaved under basic conditions.
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Accused Products
Abstract
Microcapsules formed from an aminoplast shell wall and an encapsulated ingredient or ingredients enclosed within the wall in which the wall contains a base-cleavable ester moiety.
These capsules have been found to be sensitive to the presence of base such that in the presence of base, the capsule walls are relatively quickly disintegrated or degraded so as to produce a relatively quick release of the encapsulated materials.
Microcapsules of this invention are particularly suitable for use in controlling insects having an alkaline gut such as certain lepidoptera in that the capsule shell wall may be designed so as to quickly disintegrate under the alkaline conditions present in the gut of the insect thus providing a microcapsule which is safe to handle but which is selectively effective against certain undesirable insects while not harmful to beneficial insects or insects which do not feed on the capsule materials.
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Citations
36 Claims
- 1. A microcapsule formed of an aminoplast shell wall and an encapsulated ingredient or ingredients enclosed within the wall, the wall having been produced by a microencapsulation process comprising reacting an etherified amino resin prepolymer with a cross-linking agent wherein said cross-linking agent is the ester or thioester reaction product of (a) a multifunctional alcohol selected from the group consisting of pentaerythritol, dipentaerythritol, tripentaerythritol, trimethylolpropane, glycerol, 3-mercaptopropane-diol, 1,2,4-butanetriol, 1,3,5-cyclohexanetriol, 1,2,3-heptanetriol and sorbitol, and (b) one or more 2-(hydroxy) and/or 2-(thiol) C2-C6 alkanoic acids, wherein the resulting ester and/or thioester groups are capable of being cleaved under basic conditions.
Specification