Heterogeneous microgranule and the method producing heterogeneous microgranule

Heterogeneous microgranule and the method producing heterogeneous microgranule

  • CN 102,458,640 B
  • Filed: 06/07/2010
  • Issued: 11/23/2016
  • Est. Priority Date: 06/05/2009
  • Status: Active Grant
First Claim
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1. the method producing heterogeneous microgranule, the method comprise the steps thatBeing dissolved in the polymer that at least three kinds different in volatile organic solvent obtaining the first solution, wherein the first solution comprisesAt least two cloud point, wherein the second cloud point is higher than the first cloud point, and wherein cloud point refers to that a kind of polymer becomes and other in systemThe total concentration of at least three kinds of different polymer described in solution when polymer is non-miscible and forms split-phase, the first cloud point refers to firstPolymer is as the minimum total concentration of at least three kinds of different polymer described in solution when separating from solution, and second is turbidPoint refer to the second polymer as from solution separation time solution described at least three kinds of different polymer second minimum alwaysConcentration, wherein selects the viscosity of the first solution and the first cloud point and the second cloud point so that when volatile organic solvent evaporatesDescribed at least three kinds of different polymer become the most non-miscible;

  • First solution is dispersed in containing in water continuous phase to obtain emulsion, wherein comprise surfactant containing water continuous phase;

    WithVolatile organic solvent is evaporated from emulsion;

    Wherein said method farther includes to obtain the value of at least two cloud point of the first solution and obtains based at least oneDescribed value selects described in the first solution at least three kinds of different polymer total concentration together to control the heterogeneous microgranule formedStructure, to obtain emulsion in wherein the first solution being dispersed in containing water continuous phase before evaporation, and wherein said at least threeThe total concentration of kind of different polymer is below the first cloud point, or more than the first cloud point and below the second cloud point, or secondMore than cloud point.

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