| 摘要 |
Controlled release compositions are made by including chemical impregnants (such as animal repellants, pesticides, herbicides, fungicides, plant growth stimulants, perfumes, fertilizers, and drugs) in biodegradable, microporous structures. Each microporous structure collapses upon drying but swells upon rewetting to allow the impregnant entrapped in it to diffuse from the structure. Never-dried wood pulp is a particularly desirable microporous structure because it has large pores initially, a large surface area initially, and demonstrated swelling capability. Methods for making the novel controlled release compositions and methods of using the compositions are also disclosed.
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