Tomoegawa Paper Co., Inc.

Masafumi Kamiyama

Masahiro Maeda

Hiroki Totsuka

Akihiro Sano

Minoru Tsuchida

Haruhiko Yano

Eiji O'Shima

Toshiya Matsushita

A method of suspension polymerization of a monomeric composition to produce a polymer or a polymer composition is disclosed which method comprises the steps of retaining a disperse phase component composed of the monomeric composition and a continuous phase component composed of a medium in independent vessels, supplying the disperse phase component and the continuous phase component from their respective vessels into a disperser simultaneously and continuously through associated independent passageways, applying shear force in the disperser to form a dispersion having droplets of a desired size, subsequently introducing the dispersion into a polymerization vessel, and completing a polymerizating reaction to produce a polymer or a polymer composition.

Apparatus for suspension polymerization

Method and apparatus of suspension polymerization

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.

Suspension polymerization method and particles obtained therewith

Suspension polymerization method

The present invention provides a suspension polymerization method which provides polymerized particles exhibiting excellent charging properties and a toner composed of the polymerized particles obtained with the method. The method includes the steps of: placing a continuous phase component of an aqueous medium in a continuous phase vessel, and placing a dispersed phase component composed of a monomer composition and at least one solid compound having a specific structure in a dispersed phase vessel; continuously and simultaneously supplying each of the dispersed phase component and the continuous phase component to an apparatus for providing a shear force; 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; leading the suspension material to a polymerization vessel; subjecting the suspension material in the polymerization vessel to a polymerization reaction to form a polymerized material; and drying the polymerized material to obtain the polymerized particle.

Suspension polymerization method and toner for electrophotography

Growing community of inventors

Shizuoka, Japan

Masafumi Kamiyama