Base-triggered release microcapsules
US6544540B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1999 |
| Grant date | Apr 8, 2003 |
| Priority date | — |
| Expiry date | Jul 28, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2985
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.