Patent ID: 8367291

Claim:
A toner for non-contacting fusing comprising (a) toner matrix particles comprising a resin binder and (b) an external additive having an average particle size of from 10 to 100 nm, wherein the external additive is externally added to the toner matrix particles, wherein the resin binder comprises at least two polyesters each obtained by polycondensing a carboxylic acid component and an alcohol component, wherein a carboxylic acid component of the polyester comprises (i) one or more isophthalic acid compounds selected from the group consisting of isophthalic acid and esters thereof and (ii) one or more fumaric acid/maleic acid compounds selected from the group consisting of fumaric acid, maleic acid, maleic anhydride, and esters thereof, wherein the isophthalic acid compound is contained in an amount of from 10 to 35% by weight, the fumaric acid/maleic acid compound is contained in an amount of from 1 to 15% by weight, and the isophthalic acid compound and the fumaric acid/maleic acid compound are contained in a total amount of from 20 to 36% by weight, of the total amount of the entire raw material monomers of the polyesters in the resin binder, and wherein the toner has a softening point of from 90° to 120° C., wherein the polyester comprises a polyester A having a softening point of from 90° to 120° C., obtained by polycondensing a carboxylic acid component comprising 50% by mol or more of the isophthalic acid compound and not comprising the fumaric acid/maleic acid compound, and an alcohol component, and a polyester B having a softening point of from 90° to 120° C., obtained by polycondensing a carboxylic acid component comprising 50% by mol or more of the fumaric acid/maleic acid compound and not comprising the isophthalic acid compound, and an alcohol component, wherein the polyester A and the polyester B are in a weight ratio, i.e. polyester A/polyester B, of from 90/10 to 50/50, and wherein the polyester A and the polyester B are linear polyesters.