Application of full color printers has spread rapidly in the office environment, and demands on the full color printer have been also increasing; especially, high-speed printing, oilless fusing and fine image quality are strongly requested. Recently, several types of chemical toner have been launched. Because they have small and narrow particle size distributions, they have an advantage in fine image quality. However, the resin of chemical toners are usually styrene-acrylic, which is not suitable for high-speed printing and glossy images for pictorial applications because the styrene-acrylic has to be high molecular weight to make toner have sufficient durability. On the other hand, polyester has better properties for high-speed printing than styrene-acrylic because of the existence of a polar group that enhances a compatibility with the cellulose of paper. Polyester has good durability even if it has a low molecular weight and thus can provide a glossy image. Thus polyester has several advantages over styrene-acrylic. In general, it is difficult to use polyester as the binder resin of chemical toner. On the other hand, it is easy to make polyester color toner by the pulverization method, but it is difficult to make pulverized toner having small and narrow particle size distribution for fine image quality, and it is also difficult to make pulverized toner having both oilless fusing ability and sufficient durability. In this article, design of oilless fusable, pulverized color toner with small and narrow particle size distribution was investigated. This advanced color toner named "MC toner" can provide high-speed printing, oilless fusing, and also fine image quality.
Akihiro Eida, Shinichiro Omatsu, Jun Shimizu, "Advanced Color Toner for Fine Image Quality" in Journal of Imaging Science and Technology, 2007, pp 407 - 412, https://doi.org/10.2352/J.ImagingSci.Technol.(2007)51:5(407)