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:
Feb. 10, 1998
Filed:
Jan. 21, 1994
Masafumi Kamiyama, Shizuoka, JP;
Masahiro Maeda, Shizuoka, JP;
Hiroki Totsuka, Shizuoka, JP;
Akihiro Sano, Shizuoka, JP;
Tomoegawa Paper Co., Ltd., Tokyo, JP;
Abstract
The present invention provides a suspension polymerization method for producing a polymerized particle having cavities in the particle. The method includes the steps of: placing a continuous phase component of an aqueous medium in a continuous phase vessel and a dispersed phase component composed of a monomer composition and a liquid noncompatible to the monomer composition, wherein the liquid noncompatible to the monomer composition is suspended in the monomer composition, in a dispersed phase vessel; subsequently supplying continuously and simultaneously each of the dispersed phase component and the continuous phase component to an apparatus for providing a shear force; subsequently exerting a shear force on the dispersed phase component and the continuous component to form a suspension material including polymerizable liquid-drops of a desired size; subsequently leading the suspension material to a polymerization vessel; subsequently subjecting the suspension material in the polymerization vessel to a polymerization reaction to form a polymerized material; and subsequently drying the polymerized material to obtain the polymerized particle having the cavities in the particle.