Oblon, Spivak, McClelland, Maier & Neustadt
Polyester for electrophotography
 A polyester for electrophotography derived from PA0 (a) at least one component selected from tri- or tetra-basic acid components and tri- or tetra-hydric alcohols; PA0 (b) at least one component selected from dibasic carboxylic acids and lower alkyl esters thereof; and PA0 (c) at least one component selected from aromatic diols and alicyclic diols wherein the proportion of x (mole %) of component (a) to the whole acid components and the proportion y (mole %) of component (c) to the whole acid components satisfies the following formulae (1) and (2): EQU y<(133m+51.5n) log x+(60m+25.43n) (1) EQU y>(253m+170n) log x-(176m+162n) (2) wherein 0<y<100, 0.5<x<50 0.ltoreq.y.ltoreq.100, 0.5.ltoreq.x.ltoreq.50, m is a proportion of the tetrabasic acid or alcohol in component (a) (mole %), n is a proportion of the tribasic acid or alcohol in component (a) (mole %), and m+n=1. The polyester possesses a good resistance to off-setting and good grinding characteristics. 
Mitsubishi Rayon Company Ltd.
C G
C08G G03G
inventional inventional
Masayuki Noriyuki Shinji Hitoshi Masahiro Hirokazu
Takyu Tajiri Kubo Iwasaki Itoh Ito