Method for producing core-shell (CS) particles and microcapsules using porous templates, CS particles and microcapsules, and the use thereof
First Claim
1. A method for the production of core-shell (CS) particles and/or microcapsules, comprising:
- providing porous templates, the templates being porous organic and/or inorganic microparticles having a diameter of less than 100 μ
m;
adsorbing in the porous templates at least one active compound to be encapsulated;
applying at least one primer layer to the porous templates; and
forming a capsule shell around the porous templates provided with the primer layer by applying coating materials comprising at least one of alternately charged poly-electrolyte layers and nanoparticle layers to the porous templates, wherein the primer layer is formed from a material which closes pores of the porous templates and is largely impermeable to the coating materials applied in the formation of the capsule shell.
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Accused Products
Abstract
A process for the production of CS particles (10) and microcapsules (12) is described, in which at least one active compound (4) is adsorbed in porous templates (2) (A), as a result of which templates (5) filled with active compounds are present. Subsequently, the templates (2) are provided (B) with a primer layer (6) which is intended to facilitate the subsequent construction of the capsule shell (9). The capsule shell is formed (C) by applying alternately charged polyelectrolyte layers (8). Filled CS particles (10) are obtained. By subsequent dissolution of the templates (2) the active compounds (4) are released (D) from the template into the interior of the microcapsules. The active compounds (4) remain enclosed there or are slowly released (E) from the capsule.
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Citations
21 Claims
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1. A method for the production of core-shell (CS) particles and/or microcapsules, comprising:
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providing porous templates, the templates being porous organic and/or inorganic microparticles having a diameter of less than 100 μ
m;adsorbing in the porous templates at least one active compound to be encapsulated; applying at least one primer layer to the porous templates; and forming a capsule shell around the porous templates provided with the primer layer by applying coating materials comprising at least one of alternately charged poly-electrolyte layers and nanoparticle layers to the porous templates, wherein the primer layer is formed from a material which closes pores of the porous templates and is largely impermeable to the coating materials applied in the formation of the capsule shell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A core-shell (CS) particle having:
- a diameter of less than 100 μ
m;
a porous core in which at least one active compound is adsorbed;
a primer layer which surrounds the porous core; and
a capsule shell comprising a number of layers alternately charged polyelectrolyte and/or nanoparticle layers, wherein the primer layer comprises a material which closes pores of the porous core and is largely impermeable to the layers of the capsule shell. - View Dependent Claims (13, 14, 15, 16, 17, 18)
- a diameter of less than 100 μ
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19. A microcapsule having:
- a diameter of less than 100 μ
m;
a capsule shell comprising a number of layers of alternately charged polyelectrolyte and/or nanoparticle layers;
a primer layer on the inside of the capsule shell; and
an inner framework of polyelectrolyte complexes and/or polyelectrolyte/nanoparticle complexes, which is surrounded by the primer layer and the capsule shell. - View Dependent Claims (20)
- a diameter of less than 100 μ
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21. A method for the production of microcapsules, comprising:
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providing at least one porous template, the template being a porous organic and/or inorganic microparticle having a diameter of less than 100 μ
m;coating the surface of pores of the porous template with a number of layers of alternately charged poly-electrolytes and nanoparticles; applying at least one primer layer to the porous template; forming a capsule shell around the porous template provided with the primer layer by applying coating materials comprising at least one of alternately charged poly-electrolyte and nanoparticle layers to the porous template, the primer layer being formed from a material which closes the pores of the porous template and is largely impermeable to the coating materials applied during the formation of the capsule shell; and dissolving the porous template.
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Specification