Patent ID: 9372428
Filing Date: 2016-06-21
CPC Classification: G03G,Y10T

Claim Text:
1. A charging member comprising a supporting member, an elastic layer and a surface layer, wherein the surface layer comprises a polymer compound having a Si—O-M bond, the polymer compound has at least one structural unit selected from structural units represented by a general formula (1) and a general formula (2) below, and the polymer compound has a structural unit represented by a general formula (3) below; and wherein the charging member has a crack extending from the surface thereof into the elastic layer, and the crack has a convexly raised edge by which the surface of the charging member is roughened: wherein, M represents an element selected from the group consisting of Ti, Zr and Hf; wherein, M represents an element Ta; wherein, R wherein, R wherein the polymer compound is a cross-linked product of a hydrolyzed condensate of a hydrolyzable compound having a structure represented by a general formula (12) below, and a general formula (13) below: wherein, R wherein, R wherein the raised edge crack is a cure shrinkage contraction force crack of the hydrolyzed condensate while on the elastic layer, whereby the crack extends into the elastic layer as a result of the contraction force of cure shrinkage cross-linking.