Abstract: A hollow particles-containing liquid composition which comprises: (A) crosslinked hollow particles having particle diameters of 0.4 ?m or more and containing 40 mass % or more of a toluene insoluble, in an amount of 5 to 70 mass %, (B) a reactive diluent (B1) and/or an organic solvent (B2) in an amount of 95 to 30 mass % [the total mass of the crosslinked hollow particles (A) and the reactive diluent (B1) and/or the organic solvent (B2) is 100 mass %], and (C) a dispersing agent in an amount of 0 to 30 parts by mass relative to 100 parts by mass of the total of the crosslinked hollow particles (A) and the reactive diluent (B1) and/or the organic solvent (B2). There are provided a hollow particles-containing liquid composition which is low in foreign matter content and can give a high haze, a process for production thereof, and an optical article.

Abstract: The present invention provides an emulsion composition which has been increased in sulfonic group content, yet has sufficient water resistance and has been enhanced in properties such as small resistance, film-forming property, etc. The emulsion composition contains (A) a water-based solvent, (B) an organic solvent, (C) a sulfonic group-containing polymer soluble in the component (A), and (D) a polymer soluble in the component (B) but insoluble in water. This emulsion composition is enhanced in small resistance and yet has sufficient water resistance and film-forming property.

Abstract: A method for producing a non-specific adsorption inhibitor includes reacting (A) a tosylated compound of polyoxyethylene monomethyl ether with (B) a polyamine having either an amino group or imino group (—NH—), or both, in total of 3 to 12.

Abstract: Magnetic particles comprise magnetic mother particles (A) having a particle diameter of d and non-magnetic child particles (B) having a particle diameter of d/2 or less stacked on the surface of the magnetic mother particles (A).

Abstract: Disclosed are hollow polymer particles composed of a crosslinked polymer having a comparatively small particle diameter and a narrow particle diameter distribution, an aqueous dispersion of the particles, and an ink having good flying property. The hollow polymer particles are obtained by emulsion-polymerizing a crosslinkable polymerizable monomer composition absorbed in seed particles and containing a crosslinkable monomer component and a hydrophilic monomer component, wherein the seed particles are particles of a polymer having a weight average molecular weight of 500 to 15,000, and obtained by emulsion-polymerizing 100 parts by mass of a non-crosslinkable polymerizable monomer in the presence of 0.01 to 5 parts by mass of a chain transfer agent composed of at least one compound selected from the group consisting of ?-methylstyrene dimer, thiuram disulfides and terpene hydrocarbons. The ink contains the hollow polymer particles.

Abstract: Organic polymer particles having a structure shown by the following formula (1) are disclosed. wherein A represents an alkylidene group, an alkylene group, a cyclohexylene group, or a phenylene group, and B represents a linear or branched alkylene group or an alkylidene group having 1 to 6 carbon atoms.

Abstract: A method for producing magnetic particles includes forming a hydrophobic first polymer layer on the surface of a mother particle containing superparamagnetic particles, forming a second polymer layer having glycidyl groups at least on its surface on the first polymer layer, and introducing a polar group containing one or more of at least one atom selected from the group consisting of an oxygen atom, a nitrogen atom, and a sulfur atom by chemically modifying the glycidyl groups.

Abstract: Magnetic particles comprising a group shown by the following formula (1): wherein R1 and R2 individually represent a hydroxyl group, a group shown by the following formula (2), or a group shown by the following formula (3), provided that R1 and R2 are not both hydrogen atoms, wherein R3 represents an a linear, branched, or cyclic alkylene group having 2 to 6 carbon atoms or an arylene group, and wherein R4 is a hydrogen atom or an alkyl group.

Abstract: The organic polymer particles comprise a carboxyl group and 2,3-dihydroxypropyl group, and the magnetic particles for diagnostics comprise fine magnetic material particles and a polymer part containing a hydrophilic polymer part and a crosslinked polymer part, a dry coating film obtained from a water dispersion thereof having a contact angle with water of 5° to 60°. The process for producing the carboxyl group-containing particles comprises a step of producing an ester bond by reacting a hydroxyl group in organic polymer particles having the hydroxyl group with a carboxylic anhydride. The organic polymer particles comprise a hydroxyl group originating from a 2,3-dihydroxypropyl group and a polyoxyethylene group.

Abstract: Magnetic particles having porous surfaces are obtained by forming a polymer part (B) soluble in an organic solvent (S) and a polymer part (C) insoluble in the organic solvent (S) on surfaces of magnetic matrix particles (A) and causing the polymer part (B) to come into contact with the organic solvent (S).

Abstract: An aqueous dispersion obtained by hydrolysis/condensation and radical polymerization of a mixture containing (A) at least one selected from an organosilane, a hydrolyzate of the organosilane and a condensate of the organosilane, and (B) a radical polymerizable vinyl monomer, in an emulsified state.

Abstract: Disclosed are hollow polymer particles composed of a crosslinked polymer having a comparatively small particle diameter and a narrow particle diameter distribution, an aqueous dispersion of the particles, and an ink having good flying property. The hollow polymer particles are obtained by emulsion-polymerizing a crosslinkable polymerizable monomer composition absorbed in seed particles and containing a crosslinkable monomer component and a hydrophilic monomer component, wherein the seed particles are particles of a polymer having a weight average molecular weight of 500 to 15,000, and obtained by emulsion-polymerizing 100 parts by mass of a non-crosslinkable polymerizable monomer in the presence of 0.01 to 5 parts by mass of a chain transfer agent composed of at least one compound selected from the group consisting of ?-methylstyrene dimer, thiuram disulfides and terpene hydrocarbons. The ink contains the hollow polymer particles.

Abstract: An aqueous dispersion which is excellent in storage stability, and can form a coating film excellent in leveling properties, anti-checking properties, water resistance, etc., transparent and high in hardness, which is obtained by mixing and emulsifying (A) at least one selected from an organosilane represented by (R1)4−n—(Si)—(OR2)n, a hydrolysate of the organosilane and a partial condensation product of the hydrolysate, (B) a radical polymerizable monomer, (C) an emulsifier and (D) a hydrolytic catalyst for component (A) to reduce the particle size of an emulsion, as well as to allow hydrolysis of component (A) to proceed, and adding (E) a radical polymerization initiator to allow polymerization of component (B) to proceed, has a concentration of alcohols having a boiling point of 100° C. or less of 0.1 to 2.0 wt %, and further contains (F) a component having ultraviolet absorption and/or light stabilization action as needed.

Abstract: An object of the present invention is to provide cationic hollow crosslinked polymer particles that maintain a cationic property over a wide pH range, has adequate strength, and is favorable for use in filled paper, pigments for coating paper, additives for paints, fillers for resins, rubbers, and the like. Another object of the present invention is to provide a method of producing the abovementioned cationic hollow crosslinked polymer particles with excellent characteristics in a stable manner. The hollow crosslinked polymer particles of the present invention are characterized in that (I) the zeta potential as measured in an aqueous medium of pH 2 to 9 is in the range of +5 to +100 mV, (II) the volume hollowness is in the range of 1 to 80%, and (III) the average particle diameter is in the range of 0.03 to 10 &mgr;m. This hollow crosslinked polymer particles are produced by a method that (a) 1 to 99.99 weight % of a crosslinking monomer, (b) 0.

Abstract: An aqueous dispersion which is excellent in storage stability, and can form a coating film excellent in leveling properties, anti-checking properties, water resistance, etc., transparent and high in hardness, which is obtained by mixing and emulsifying (A) at least one selected from an organosilane represented by (R1)4−n—(Si)—(OR2)n, hydrolysate of the organosilane and a partial condensation product of the hydrolysate, (B) a radical polymerizable monomer, (C) an emulsifier and (D) a hydrolytic catalyst for component (A) to reduce the particle size of an emulsion, as well as to allow hydrolysis of component (A) to proceed, and adding (E) a radical polymerization initiator to allow hydrolysis/condensation reaction of component (A) and polymerization reaction of component (B) to proceed, has a concentration of alcohols having a boiling point of 100° C. or less of 0.1 to 2.0 wt %, and further contains (F) a component having ultraviolet absorption and/or light stabilization action as needed.

Abstract: An aqueous dispersion obtained by hydrolysis/condensation and radical polymerization of a mixture containing (A) at least one selected from an organosilane, a hydrolyzate of the organosilane and a condensate of the organosilane, and (B) a radical polymerizable vinyl monomer, in an emulsified state.

Abstract: An object of the present invention is to provide cationic hollow crosslinked polymer particles that maintain a cationic property over a wide pH range, has adequate strength, and is favorable for use in filled paper, pigments for coating paper, additives for paints, fillers for resins, rubbers, and the like. Another object of the present invention is to provide a method of producing the abovementioned cationic hollow crosslinked polymer particles with excellent characteristics in a stable manner. The hollow crosslinked polymer particles of the present invention are characterized in that (I) the zeta potential as measured in an aqueous medium of pH 2 to 9 is in the range of +5 to +100 mV, (II) the volume hollowness is in the range of 1 to 80%, and (III) the average particle diameter is in the range of 0.03 to 10 &mgr;m. This hollow crosslinked polymer particles are produced by a method that (a) 1 to 99.99 weight % of a crosslinking monomer, (b) 0.