US2008064789A1PendingUtilityA1

Microencapsulated particles and process for manufacturing same

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Assignee: ENCAP TECHNOLOGIES INCPriority: Nov 20, 2001Filed: Nov 19, 2007Published: Mar 13, 2008
Est. expiryNov 20, 2021(expired)· nominal 20-yr term from priority
Inventors:Robert G. Bayless
B01J 13/02B01J 13/14Y10T428/2989Y10T428/2982Y10T428/2991Y10T428/2984B01J 13/06Y10T428/2985
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Claims

Abstract

Microencapsulated particles having improved resistance to moisture and extended release capabilities are produced by microencapsulating the particles in a film-forming, cross-linked, hydrolyzed polymer.

Claims

exact text as granted — not AI-modified
1 . A process for microencapsulating a substance, wherein the process comprises the steps of: 
 A. mixing a film-forming, cross-linkable, hydrolyzed polymer and an organic, nonpolar solvent for the polymer, wherein the solvent is not a solvent for particles of the substance;    B. agitating the mixture to form a solution of the polymer in the solvent;    C. adding particles of the substance to the solution under conditions of continuing agitation, wherein the substance particles are dispersed in the solution;    D. inducing a phase separation of the solution, wherein the polymer is separated from the solution and a film-like sheath of the polymer is formed and coated on each substance particle; and    E. adding a cross-linking agent to the solution under conditions of continuing agitation, wherein the film-like sheath on each substance particle cross-links and hardens around each substance particle,    whereby the microencapsulated substance particles have improved impermeability to moisture as compared to substance particles that are microencapsulated using other film-forming polymers.    
     
     
         2 . A process as defined by  claim 1  wherein the substance is a phosphor.  
     
     
         3 . A process as defined by  claim 1  wherein the substance is a polymer light-emitting diode.  
     
     
         4 . A process as defined by  claim 1  wherein the substance is an organic light-emitting diode.  
     
     
         5 . A process as defined by  claim 1  wherein the film-forming, cross-linkable, hydrolyzed polymer is a poly(ethylene-vinyl acetate).  
     
     
         6 . A process as defined by  claim 1  wherein the organic, nonpolar solvent is toluene.  
     
     
         7 . A process as defined by  claim 1  wherein the phase separation is induced by addition of cottonseed oil, corn oil, linseed oil, soybean oil or a mixture of two or more of these oils.  
     
     
         8 . A process as defined by  claim 1  wherein the cross-linking agent is a diisocyanate or polyisocyanate.  
     
     
         9 . A process as defined by  claim 8  wherein the cross-linking agent is toluene diisocyanate.  
     
     
         10 . A process as defined by  claim 8  wherein the cross-linking agent is a toluene diisocyanate-trimethyol propane adduct.  
     
     
         11 . A process as defined by  claim 1  wherein the polymer is hydrolyzed from about 42 to about 46 percent.  
     
     
         12 . A microencapsulated substance having improved impermeability to moisture, wherein the microencapsulated substance is produced by a process that comprises the steps of: 
 A. mixing a film-forming, cross-linkable, hydrolyzed polymer and an organic, nonpolar solvent for the polymer, wherein the solvent is not a solvent for particles of the substance;    B. agitating the mixture to form a solution of the polymer in the solvent;    C. adding particles of the substance to the solution under conditions of continuing agitation, wherein the substance particles are dispersed in the solution;    D. inducing a phase separation of the solution, wherein the polymer is separated from the solution and a film-like sheath of the polymer is formed and coated on each substance particle; and    E. adding a cross-linking agent to the solution under conditions of continuing agitation, wherein the film-like sheath on each substance particle cross-links and hardens around each substance particle,    whereby the microencapsulated substance particles have improved impermeability to moisture as compared to substance particles that are microencapsulated using other film-forming polymers.    
     
     
         13 . A microencapsulated substance as defined by  claim 12  wherein the film-forming, cross-linkable, hydrolyzed polymer is a poly(ethylene-vinyl acetate).  
     
     
         14 . A microencapsulated substance as defined by  claim 12  wherein the organic, nonpolar solvent is toluene.  
     
     
         15 . A microencapsulated substance as defined by  claim 12  wherein the phase separation is induced by addition of cottonseed oil, corn oil, linseed oil, soybean oil or a mixture of two or more of these oils.  
     
     
         16 . A microencapsulated substance as defined by  claim 12  wherein the cross-linking agent is a diisocyanate or polyisocyanate.  
     
     
         17 . A microencapsulated substance as defined by  claim 16  wherein the cross-linking agent is toluene diisocyanate.  
     
     
         18 . A microencapsulated substance as defined by  claim 16  wherein the cross-linking agent is a toluene diisocyanate-trimethyol propane adduct.  
     
     
         19 . A microencapsulated substance as defined by  claim 12  wherein the polymer is hydrolyzed from about 42 to about 46 percent.  
     
     
         20 . A microencapsulated substance as defined by claim  120  wherein the substance is a phosphor.  
     
     
         21 . A microencapsulated substance as defined by  claim 12  wherein the substance is a polymer light-emitting diode.  
     
     
         22 . A microencapsulated substance as defined by  claim 12  wherein the substance is an organic light-emitting diode.  
     
     
         23 . A process for microencapsulating phosphor particles, wherein the process comprises the steps of: 
 A. mixing a film-forming, cross-linkable, hydrolyzed polymer and an organic, nonpolar solvent for the polymer, wherein the solvent is not a solvent for particles of the substance;    B. agitating the mixture to form a solution of the polymer in the solvent;    C. adding particles of the substance to the solution under conditions of continuing agitation, wherein the substance particles are dispersed in the solution;    D. inducing a phase separation of the solution, wherein the polymer is separated from the solution and a film-like sheath of the polymer is formed and coated on each substance particle; and    E. adding a cross-linking agent to the solution under conditions of continuing agitation, wherein the film-like sheath on each substance particle cross-links and hardens around each substance particle,    whereby the microencapsulated substance particles have improved impermeability to moisture as compared to substance particles that are microencapsulated using other film-forming polymers.    
     
     
         24 . A process as defined by  claim 23  wherein the film-forming, cross-linkable, hydrolyzed polymer is a poly(ethylene-vinyl acetate).  
     
     
         25 . A process as defined by  claim 23  wherein the organic, nonpolar solvent is toluene.  
     
     
         26 . A process as defined by  claim 23  wherein the phase separation is induced by addition of cottonseed oil, corn oil, linseed oil, soybean oil or a mixture of two or more of these oils.  
     
     
         27 . A process as defined by  claim 23  wherein the cross-linking agent is a diisocyanate or polyisocyanate.  
     
     
         28 . A process as defined by  claim 27  wherein the cross-linking agent is toluene diisocyanate.  
     
     
         29 . A process as defined by  claim 27  wherein the cross-linking agent is a toluene diisocyanate-trimethyol propane adduct.  
     
     
         30 . A process as defined by  claim 23  wherein the polymer is hydrolyzed from about 42 to about 46 percent.  
     
     
         31 . A process as defined by  claim 1  wherein the steps are sequential.  
     
     
         32 . A process as defined by  claim 23  wherein the microencapsulated phosphor particles are useful in electroluminescent applications.

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