The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 12, 1999
Filed:
Oct. 24, 1996
Abdellatif Chenite, Kirkland, CA;
Amine Selmani, Laval, CA;
Bio Syntech, Chomedey, CA;
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.