Process for preparing microparticles through phase inversion phenomena
First Claim
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1. A method for microencapsulating an agent to form a microencapsulated product, comprising:
- dissolving a polymer in an effective amount of a solvent,dissolving or dispersing said agent in said effective amount of said solvent, wherein said polymer, said agent and said solvent form a mixture having a continuous phase and wherein the solvent is said continuous phase, andintroducing said mixture into an effective amount of a nonsolvent to cause the spontaneous formation of said microencapsulated product, wherein said solvent and said nonsolvent are miscible and 0<
δ
solvent -δ
nonsolvent <
6 wherein the nonsolvent and solvent are used in effective amounts, wherein the effective amount of nonsolvent and solvent is an effective amount when the solvent;
nonsolvent volume ratio is between 1;
40 and 1;
1,000,000.
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Abstract
A process for preparing nanoparticles and microparticles is provided. The process involves forming a mixture of a polymer and a solvent, wherein the solvent is present in a continuous phase and introducing the mixture into an effective amount of a nonsolvent to cause the spontaneous formation of microparticles.
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Citations
31 Claims
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1. A method for microencapsulating an agent to form a microencapsulated product, comprising:
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dissolving a polymer in an effective amount of a solvent, dissolving or dispersing said agent in said effective amount of said solvent, wherein said polymer, said agent and said solvent form a mixture having a continuous phase and wherein the solvent is said continuous phase, and introducing said mixture into an effective amount of a nonsolvent to cause the spontaneous formation of said microencapsulated product, wherein said solvent and said nonsolvent are miscible and 0<
δ
solvent -δ
nonsolvent <
6 wherein the nonsolvent and solvent are used in effective amounts, wherein the effective amount of nonsolvent and solvent is an effective amount when the solvent;
nonsolvent volume ratio is between 1;
40 and 1;
1,000,000. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for microencapsulating an agent to form a microencapsulated product, comprising:
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dissolving a polymer in a solvent at a concentration of less than 10% weight/volume, dissolving or dispersing said agent in said solvent, wherein said polymer, said agent and said solvent form a mixture having a viscosity of less than 3.5 centipoise, and introducing said mixture into a nonsolvent, wherein the volume ratio of solvent;
nonsolvent is at least 1;
40, to cause the spontaneous formation of said microencapsulated product, wherein said solvent and said nonsolvent are miscible and 0<
δ
solvent -δ
nonsolvent <
6. - View Dependent Claims (24)
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25. A method for microencapsulating an agent to form a microencapsulated product, comprising:
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dissolving a polymer in an effective amount of a solvent, dissolving or dispersing an agent in the effective amount of the solvent by freezing the mixture of the solvent, the polymer, and the agent to form a frozen mixture and drying by vacuum the frozen mixture, wherein the polymer, the agent and the solvent in the frozen mixture have a continuous phase, redissolving the continuous phase frozen mixture in a solvent, and introducing the mixture into an effective amount of a nonsolvent to cause the spontaneous formation of microencapsulated product, wherein the solvent and the nonsolvent are miscible and 0<
δ
solvent -δ
nonsolvent <
6. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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Specification