POLYESTER RESIN FOR TONER, TONER, DEVELOPER, AND IMAGING APPARATUS Russian patent published in 2018 - IPC C08G63/12 C08G63/123 G03G9/00 G03G9/87 

FIELD: biochemistry.

SUBSTANCE: present invention relates to a toner comprising a polyester resin. Described is a toner comprising a polyester resin including a segment derived from an alcohol component, and a segment derived from a carboxylic acid component in which the alcohol component contains a trivalent aliphatic alcohol or an aliphatic alcohol with a higher valency and which satisfies the following expressions (1) – (3): 500 ≤ weight-average molecular weight (Mw)/((Valence of a trivalent aliphatic alcohol or an aliphatic alcohol with a higher valence) x (Amount of a trivalent aliphatic alcohol or aliphatic alcohol with a higher valence)) ≤ 4,000 (expression (1)); 4,000 ≤ weight-average molecular weight (Mw) ≤ 25000 (expression (2)) and 0.5 ≤ (Amount of a trivalent aliphatic alcohol or aliphatic alcohol with a higher valence) ≤ 6.5 (expression (3)), where in expressions (1) and (3) the amount of trivalent aliphatic alcohol or aliphatic alcohol with a higher valency indicates the molar percentage of a trivalent aliphatic alcohol or an aliphatic alcohol with a higher valence relative to the alcohol component, wherein said toner contains a tetrahydrofuran (THF)-insoluble substance in which the tetrahydrofuran-insoluble substance contains a second polyester resin in which the components of the second polyester resin comprise a diol component and a crosslinking component in which the diol component comprises 50 mol % or more of an aliphatic diol having 3 to 10 carbon atoms and in which the crosslinking component comprises a trivalent aliphatic alcohol or an aliphatic alcohol with a higher valence, wherein the amount of the second polyester resin is from 5 parts by weight to 25 parts by weight with respect to 100 parts by weight of toner and wherein the second polyester resin contains at least one of a urethane bond and a urea bond. Developer comprising said toner and a carrier is also described. Imaging apparatus comprising said toner is described.

EFFECT: technical result is a toner having a satisfactory ability to low-temperature fixation, stability in storage at high temperature and high humidity, characterized by the absence of white voids after transfer, forming images that are glossy and resistant to sticking.

10 cl, 5 dwg, 11 ex, 4 tbl