This present research relates to a toner comprised the new polyester resin for electrophotography which is used in copiers, printers, fax machines or multifunction devices utilizing heat-roll fixing.This polyester resin was prepared by synthesizing a linear polyester resin having low molecular weight peak top in a range of 1×103 to 1×104, and then cross-linking with dicarboxylic acid component having long chain structure and polyol component having four hydroxyl groups.This resin has a low molecular weight peak top and widened molecular weight distribution. The toner comprised this resin showed excellent fixing properties at low temperature without losing anti-offset up to 220°C. Then, it was concluded that the polyester resin is an useful toner binder for the contact heated fixing process.
Koji Nakayama, "New Polyester Resin for Electrophotography Toner Having Excellent Fixing Properties" in Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP14), 1998, pp 394 - 397, https://doi.org/10.2352/ISSN.2169-4451.1998.14.1.art00015_2