NONSPHERICAL POLYMER PARTICLE AND ITS PRODUCTION

Japanese Patent JP3415939

B2

PURPOSE: To obtain polymer particles having a narrow particle size distribution and suitable for a toner etc.. by treating a liq. dispersion of particles of a polymer having ionically dissociatable groups (e.g. acrylic acid groups) with an electrolyte, a solvent, and a nonionic surfactant to form agglomerates and thermally fusing the particles in the agglomerates.
CONSTITUTION: Nonspherical polymer particles are formed by treating a liq. dispersion of particles of a polymer (A) having ionically dissociatable groups with an electrolyte (B) in a concn. higher than the critical agglomeration concn. of the dispersion, an org. solvent (C) infinitely sol. in water and a nonionic surfactant (D) to form agglomerates and thermally fusing the particles in the agglomerates. Component A is obtd. e.g. by copolymerizing a monomer having a carboxyl, sulfo, or amino group, etc., pref. by emulsion polymn.. and may be compounded with a pigment, a dye, etc., if required. Component B is pref. a salt of a monovalent metal. Component C is pref. methanol, etc. Using component D in a concn. higher than one-half the critical micelle concn. prevents excess agglomeration. The nonspherical polymer particles, having a narrow particle size distribution, is suitably used for an electrophtographic toner and a carrier for a physiologically active substance.

JP3000654	[Title of Invention] Polytetrafluoroethylene fine particles and powder
JPS6272727	PRODUCTION OF FINE RESIN PARTICLE
JP3634110	POROUS PARTICLE, SUSTAINED RELEASE PARTICLES AND PRODUCTION THEREOF

Mikio Kamiyama
Kenji Hayashi
Tomoe Kikuchi

JP22395394A

June 09, 2003

August 26, 1994

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Konica Corporation

C08J3/16; G03G9/087; G03G9/09; (IPC1-7): C08J3/16

JP7252430A
JP6145366A
JP4337332A

Yoshio Iwama

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