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:
Nov. 15, 2011
Filed:
Jan. 22, 2009
Shinji Hibino, Nagoya, JP;
Hideo Matsuzaki, Nagoya, JP;
Akihiro Gotou, Nagoya, JP;
Toagosei Co., Ltd., Tokyo, JP;
Abstract
The object of the present invention is to provide a process for producing high-quality polymer microparticles having uniform particle size of the order of several micrometers to tens of micrometers by inverse suspension polymerization at high productivity while keeping excellent dispersion stability without causing aggregation among particles. The process is one for the production of polymer microparticles by inverse suspension polymerization of a vinyl monomer and includes steps of preparing in a dispersing tank a water-in-oil (W/O) type emulsion in which an organic solvent is a continuous phase and an aqueous solution of a vinyl-based monomer is a dispersing phase, and conducting the inverse suspension polymerization while feeding the water-in-oil (W/O) type emulsion to a continuous stirred tank reactor.