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:
Oct. 17, 2006
Filed:
Jun. 02, 2005
Tatsuya Konishi, Ibaraki, JP;
Takeo Matsumura, Ibaraki, JP;
Kenjiro Mori, Ibaraki, JP;
Nitto Denko Corporation, Ibaraki, JP;
Abstract
The present invention provides a method of producing porous spherical particles, which includes suspension polymerization of a multifunctional monomer having two or more vinyl groups and a vinyl monomer having one vinyl group in an aqueous medium in the presence of a porogen and a distribution stabilizer, wherein the distribution stabilizer is polyvinyl alcohol having a saponification degree of 75 to 85 mol %. According to the method of the present invention, generation of particle agglomerates and large particles can be suppressed and porous spherical particles having a desired average particle size and a narrow particle size distribution can be conveniently produced.