JP2010039264A5 - - Google Patents

Claims (11)

A toner having toner particles containing a binder resin and a colorant, and inorganic fine powder and organic fine powder,
(I) said inorganic fine powder, pieces number average particle diameter (D1) is contained 300nm following inorganic fine powder A over 30 nm, the isolation ratio of the toner particles of the inorganic fine powder A is 10.0 wt% or more 50.0 mass% or less,
(Ii) the organic fine powder, pieces number average particle diameter (D1) is contained 1000nm following organic fine powder B or 50 nm, the isolation ratio of the toner particles of the organic fine powder B is 3.0 mass% or less And
(Iii) The number average particle diameter of the inorganic fine powder A is not more than the number average particle diameter of the organic fine powder B;
(Iv) A toner having an average circularity of 0.960 or more.   The toner according to claim 1, wherein the organic fine powder B has a liberation rate from toner particles of 1.0% by mass or less.   The content of the inorganic fine powder A with respect to the toner particles is 1.0% by mass or less, and the content of the organic fine powder B is less than or equal to the content of the inorganic fine powder A. Item 3. The toner according to Item 1 or 2. The main component of the organic fine powder B is, toner according to either the claims 1 to 3, characterized in that an acrylic polymer or an acrylic copolymer.   5. The toner according to claim 1, wherein the organic fine powder B has a weight average molecular weight (Mw) of a component soluble in tetrahydrofuran of 300000 or more and 1000000 or less. The toner according to Izu Re one of claims 1 to 5 wherein the inorganic fine powder A is characterized in that it is a strontium titanate fine powder.   The toner according to claim 6, wherein the strontium titanate fine powder is a particle having a cubic particle shape and / or a rectangular parallelepiped particle shape and having a perovskite crystal.   The toner according to claim 6 or 7, wherein the strontium titanate fine powder contains a fatty acid, a fatty acid salt, or an organosilane compound.   The toner according to claim 1, wherein the colorant is a magnetic powder. Before the Quito toner of 5 mol / l during hydrochloric acid dissolved, and the dissolved amount of the magnetic powder is 10 mass% or less than 0.5 wt% with respect to the magnetic powder total content of 3 min time point, at 15 min time point The toner according to claim 9, wherein the dissolved amount of the magnetic powder with respect to the total content of the magnetic powder is 40% by mass or more and 80% by mass or less. The toner according to any one of claims 1 to 10, wherein the toner particles are toner particles produced by suspension polymerization.