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:
Sep. 07, 1993
Filed:
Jul. 29, 1991
Applicant:
Inventors:
Assignee:
Rhone-Poulenc Chimie, Courbevoie, FR;
Primary Examiner:
Int. Cl.
CPC ...
A61K / ; C08F / ; C08F / ; C08L / ; C08K / ; B01J / ; B01J / ; G01N / ;
U.S. Cl.
CPC ...
524376 ; 524556 ; 524567 ; 524568 ; 524571 ; 524577 ; 524804 ; 523205 ; 523206 ; 525 541 ; 526217 ; 5262923 ; 526274 ; 526286 ; 526287 ; 526302 ; 526310 ; 526311 ; 5263171 ; 252 6254 ; 428402 ; 428403 ; 428405 ; 435176 ; 435180 ; 435188 ; 436527 ; 530812 ; 530815 ;
Abstract
A process for the preparation of aqueous dispersions of magnetizable polymer particles with a narrow distribution from aqueous dispersions with a wide distribution. The amount of water in the aqueous dispersion with a wide distribution is adjusted so that the proportion by weight of magnetizable polymer particles is between about 1 and 40% of said dispersion. The surfactant concentration of the dispersion after the water adjustment is increased until two phases are obtained: a so-called liquid phase and a so-called solid phase. After separation of these two phases is accomplished, these steps are repeated as desired. An aqueous dispersion with a narrow size distribution is recovered.