Microencapsulated and nanoencapsulated particles, moisture barrier resins, and processes for manufacturing same
AssigneeEncap Technologies Inc.
InventorRobert G. Bayless
Life of this patent
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Abstract
Moisture barrier resins comprising a film-forming, cross-linkable, partially hydrolyzed polymer and a cross-linking agent provide improved impermeability to moisture and extended release capabilities for various particles, substances and other core materials that are encapsulated with compositions which contain these resins.
Claims53
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.
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.
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.
A moisture-barrier resin comprising a mixture of (a) a film-forming, cross-linkable, partially hydrolyzed polymer and (b) a cross-linking agent.
A moisture barrier resin comprising a solvent-based mixture of (a) film-forming, cross-linkable, partially hydrolyzed polymer and (b) a cross-linking agent.
A process for the manufacture of a moisture barrier resin, wherein the process comprises reacting a film-forming, cross-linkable, partially hydrolyzed polymer and a cross-linking agent.
An encapsulated substance having improved impermeability to moisture, wherein the substance is encapsulated with a composition containing a moisture barrier resin comprising a mixture of (a) a film-forming, cross-linkable, partially hydrolyzed polymer and (b) a cross-linking agent.
Dependencies are inferred from the claim text.