POLYESTER RESIN FOR TONER, TONER, DEVELOPER, AND IMAGE FORMATION DEVICE
申请人:Ricoh Company, Ltd.
公开号:EP3103826A1
公开(公告)日:2016-12-14
A polyester resin for a toner, the polyester resin including:
a segment derived from an alcohol component; and
a segment derived from a carboxylic acid component,
wherein the alcohol component includes a trivalent or higher aliphatic alcohol, and
wherein the polyester resin satisfies Expressions (1) to (3) below: 500≤Weight average molecular weightMwValence of the trivalent or higher aliphatic alcohol×Amount of the trivalent or higher aliphatic alcohol≤4,000 4,000 ≤ Weight average molecular weight (Mw) ≤ 25,000 ··· Expression (2); and 4,000 ≤ (Amount of the trivalent or higher aliphatic alcohol) ≤ 6.5 ··· Expression (3),
where, in the Expressions (1) and (3), the Amount of the trivalent or higher aliphatic alcohol denotes a percent by mole of the trivalent or higher aliphatic alcohol relative to the alcohol component.