Elastomeric controlled release formulation and article comprising same
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United States of America Patent
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Jun 10, 1986
Grant Date -
N/A
app pub date -
May 1, 1985
filing date -
May 1, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Means for the sustained release of an active agent into the environment comprise an elastomeric matrix and the active agent contained in the matrix. The matrix material has a modulus between about 10.sup.4 Pa and about 10.sup.8 Pa at 23.degree. C., and a glass transition temperature less than 0.degree. C. The matrix comprises polyurethane formed by reacting polyol and isocyanate, and the active agent can be any biologically or nonbiologically active agent that is compatible with the matrix, e.g., the insecticide 2,2' dichlorovinyl dimethyl phosphate. The inventive sustained release system has particularly advantageous release properties, e.g., it typically can release more than 70% of the active agent contained in the matrix.
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