×

MICROENCAPSULATED PARTICLES AND PROCESS FOR MANUFACTURING SAME

  • US 20040130045A1
  • Filed: 11/14/2002
  • Published: 07/08/2004
  • Est. Priority Date: 11/20/2001
  • Status: Active Grant
First Claim
Patent Images

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.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×