Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1996-10-24
1999-01-12
Lovering, Richard D.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
264 44, 264 5, 264 7, 264 9, 424425, 424486, 42840224, 514963, B29B 910, B32B 2736, B01J 1304
Patent
active
058585311
ABSTRACT:
The present invention relates to a new method for the production of polymer microparticles. The method is carried out in the absence of organic solvent, and consists in the steps of (a) combining first and second polymers, the first and second polymers being immiscible, (b) heating the combination obtained in step (a) so as to melt the first and second polymers; (c) stirring the melted polymers obtained in step (b) under conditions effective to produce a biphasic system comprising a dispersed phase consisting of a dispersion of the first polymer and a matrix continuous phase comprising the second polymer, the dispersed phase containing microparticles of the first polymer dispersed in the matrix continuous phase; (d) solidifying the biphasic system obtained in step (c) so as to keep the microparticles of the first polymer dispersed in the matrix continuous phase; and (e) separating and isolating the microparticles of the first polymer from the matrix continuous phase, wherein the first polymer forming said dispersed phase is water-insoluble, while the second polymer forming the continuous phase is water-soluble.
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Chenite Abdellatif
Selmani Amine
Bio Syntech
Lovering Richard D.
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