AN ENCAPSULATED PARTICLE

An encapsulated particle comprises a core particle and a polyurethane layer disposed about the core particle. The core particle can be various particles, such as fertilizer, biocides, flame retardants, seeds, etc. The polyurethane layer comprises the reaction product of an isocyanate component and a...

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1. Verfasser: MENTE, DONALD, CHARLES
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description An encapsulated particle comprises a core particle and a polyurethane layer disposed about the core particle. The core particle can be various particles, such as fertilizer, biocides, flame retardants, seeds, etc. The polyurethane layer comprises the reaction product of an isocyanate component and an isocyanate-reactive component. The isocyanate-reactive component comprises a graft polyol having a continuous phase and polymeric particles. A method of forming the encapsulated particle comprises the steps of providing the core particle, applying the isocyanate and isocyanate-reactive components to the core particle, and reacting the isocyanate and isocyanate-reactive components to form the polyurethane layer. The encapsulated particle has excellent physical properties, such as increased water repellency, resiliency and shelf life. L'invention concerne une particule encapsulée qui comprend une particule coeur et une couche de polyuréthanne, formée autour de la particule coeur. La particule coeur peut être constituée de diverses particules telles qu'un engrais, des biocides, des retardateurs de flamme, des semences, etc. La couche de polyuréthanne comprend le produit de réaction d'un composant d'isocyanate et d'un composant réagissant aux isocyanates. Le composant réagissant aux isocyanates comprend un polyol greffé comportant une phase continue et des particules polymères. Le procédé de formation de cette particule encapsulée consistant : à prévoir la particule coeur, à appliquer le composant d'isocyanate et les composants réagissant aux isocyanates sur la particule coeur, et à faire réagir les composants d'isocyanate et ceux réagissant aux isocyanates afin de former la couche de polyuréthanne. La particule encapsulée présente d'excellentes propriétés physiques, p. ex. caractéristiques accrues d'hydrophobicité, d'élasticité et de durée de stockage.
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La particule coeur peut être constituée de diverses particules telles qu'un engrais, des biocides, des retardateurs de flamme, des semences, etc. La couche de polyuréthanne comprend le produit de réaction d'un composant d'isocyanate et d'un composant réagissant aux isocyanates. Le composant réagissant aux isocyanates comprend un polyol greffé comportant une phase continue et des particules polymères. Le procédé de formation de cette particule encapsulée consistant : à prévoir la particule coeur, à appliquer le composant d'isocyanate et les composants réagissant aux isocyanates sur la particule coeur, et à faire réagir les composants d'isocyanate et ceux réagissant aux isocyanates afin de former la couche de polyuréthanne. 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La particule coeur peut être constituée de diverses particules telles qu'un engrais, des biocides, des retardateurs de flamme, des semences, etc. La couche de polyuréthanne comprend le produit de réaction d'un composant d'isocyanate et d'un composant réagissant aux isocyanates. Le composant réagissant aux isocyanates comprend un polyol greffé comportant une phase continue et des particules polymères. Le procédé de formation de cette particule encapsulée consistant : à prévoir la particule coeur, à appliquer le composant d'isocyanate et les composants réagissant aux isocyanates sur la particule coeur, et à faire réagir les composants d'isocyanate et ceux réagissant aux isocyanates afin de former la couche de polyuréthanne. La particule encapsulée présente d'excellentes propriétés physiques, p. ex. caractéristiques accrues d'hydrophobicité, d'élasticité et de durée de stockage.</abstract><oa>free_for_read</oa></addata></record>
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subjects CHEMISTRY
COMPOSITIONS BASED THEREON
FERTILISERS
FERTILISERS CHARACTERISED BY THEIR FORM
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
MANUFACTURE THEREOF
METALLURGY
MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENTSUBCLASSES OF CLASS C05
MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVINGA SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES,SOIL-CONDITIONERS, WETTING AGENTS
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
title AN ENCAPSULATED PARTICLE
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