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US 2012/0068219 A1Published application
Microencapsulated particles and process for manufacturing same
AssigneeEncap Technologies Inc.
InventorRobert G. Bayless
Life of this patent
Estimating the term…
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.
Claims32
A process for microencapsulating a substance, wherein the process comprises the steps of:
- A. mixing a first amount of 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 second amount of a polyisocyanate cross-linking agent to the solution under conditions of continuing agitation, the mass of said second amount being greater than the mass of said first amount, 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.
4 more elements
(canceled)
(canceled)
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 first amount of 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 second amount of a polyisocyanate cross-linking agent to the solution under conditions of continuing agitation, the mass of said second amount being greater than the mass of said first amount, 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.
4 more elements
(canceled)
(canceled)
A process for microencapsulating phosphor particles, wherein the process comprises the steps of:
- A. mixing a first amount of 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 second amount of a polyisocyanate cross-linking agent to the solution under conditions of continuing agitation, the mass of said second amount being greater than the mass of said first amount, 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.
4 more elements
(canceled)
(canceled)
Dependencies are inferred from the claim text.