Controlled release delivery coating formulation for bioactive substances
First Claim
1. A bioactive composition having a controlled, sustained release delivery pattern when contacted with a suitable surrounding media comprising:
- (a) a pharmaceutically, insecticidally, herbicidally or fertilizing bioactive material core, soluble in the surrounding media, the core present in an amount at least sufficient for a total dosage during a specified treatment period;
(b) a first coating enveloping the bioactive material core comprising a polymer or a blend of polymers, said polymer or blend of polymers being water-soluble and swellable upon penetration by the surrounding media; and
(c) a second coating enveloping the first coating, the second coating comprising a polymer or a blend of polymers;
said polymer or blend of polymers being water-insoluble and forming a semi-permeable barrier permitting inward diffusion of the surrounding media and outward diffusion of the bioactive material dissolved in the surrouding media;
whereby when the composition is exposed to the surrounding media, the exposure will result in the controlled release of the bioactive material.
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Accused Products
Abstract
The present invention relates to a bioactive composition having a controlled, sustained release delivery pattern when contacted with a suitable surrounding media. The composition comprises a pharmaceutically, insecticidally, herbicidally or fertilizing bioactive material core, soluble in a given surrounding media, the core present in an amount at least sufficient for a total dosage during a specified treatment period; a first coating enveloping the bioactive material core comprising a polymer or a blend of polymers, said polymer or blend of polymers being swellable upon penetration by the surrounding media; and a second coating enveloping the first coating, the second coating comprising a polymer or a blend of polymers being water-insoluble and forming a semi-permeable barrier to the inward diffusion of the surrounding media and the outward diffusion of the bioactive material dissolved in the surrounding media.
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Citations
6 Claims
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1. A bioactive composition having a controlled, sustained release delivery pattern when contacted with a suitable surrounding media comprising:
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(a) a pharmaceutically, insecticidally, herbicidally or fertilizing bioactive material core, soluble in the surrounding media, the core present in an amount at least sufficient for a total dosage during a specified treatment period; (b) a first coating enveloping the bioactive material core comprising a polymer or a blend of polymers, said polymer or blend of polymers being water-soluble and swellable upon penetration by the surrounding media; and (c) a second coating enveloping the first coating, the second coating comprising a polymer or a blend of polymers;
said polymer or blend of polymers being water-insoluble and forming a semi-permeable barrier permitting inward diffusion of the surrounding media and outward diffusion of the bioactive material dissolved in the surrouding media;whereby when the composition is exposed to the surrounding media, the exposure will result in the controlled release of the bioactive material. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification