Patent ID: 7638250
Filing Date: 2009-12-29
Classification: G03G

Abstract:
1. A toner, comprising: a colorant; a binder resin (A) comprising a polyester resin having no tetrahydrofuran insoluble component, and having a molecular weight distribution such that components having a molecular weight of not greater than 500 are included in an amount of not greater than 4% by weight, based on the weight of the polyester resin, and a peak is present in a molecular weight range of from 3,000 to 9,000 when measured by gel permeation chromatography (GPC); and a binder resin (B) comprising a polyester resin having no tetrahydrofuran insoluble component, and comprising units of a polycarboxylic acid and a diol having the following formula (1): wherein at least one of the binder resins (A) and (B) is prepared in the presence of, and the toner comprises, at least one titanium comprising catalyst selected from the group consisting of a titanium catalyst of formula (2), a titanium catalyst of formula (3), and combinations thereof, wherein X represents a residue group of a mono- or poly- alkanolamine from which a hydrogen atom is removed from one hydroxyl group, wherein, when X is a poly-alkanolamine, one or more additional hydroxyl groups, that do not include the one hydroxyl group from which the hydrogen atom is removed, of the poly-alkanolamine may, optionally, be subjected to an intramolecular polycondensation with a hydroxyl group directly bound to a Ti atom to which the residue group X is bound so as to form a ring structure, or an intermolecular polycondensation with a hydroxyl group directly bound to another Ti atom so as to form a repeating structure, wherein the repeating structure has a polymerization degree of from 2 to 5; R represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms which, optionally, may have 1 to 3 ether bonds; m represents an integer of 1 to 4; n represents an integer of 0 to 3; a sum of m and n is 4; p represents an integer of 1 or 2; q represents and integer of 0 or 1; wherein a sum of p and q is 2, and when each of m and p is 2 or more, each of X may be the same or different; and wherein a weight ratio ((A)/(B)) of the binder resin (A) to the binder resin (B) is from 60/40 to 85/15.