Developer carrying member, electrophotographic process cartridge, and electrophotographic image forming apparatus

摘要

Provided are a developer carrying member, and a process cartridge and an electrophotographic apparatus using the developer carrying member, the developer carrying member including a substrate, an elastic layer, and a surface layer covering a surface of the elastic layer in which the surface layer contains a modified acrylic resin, and the modified acrylic resin has a constituent unit represented by the following structural formula (1).;
(R1 represents an alkyl group having 1 to 3 carbon atoms; U represents a urethane resin having, between two adjacent urethane bonds, a structure represented by the following structural formula (2), and at least one of structure selected from a structure represented by the following structural formula (3) and a structure represented by the following structural formula (4); and L represents a divalent linking group containing an ester bond (—O—C(═O)—)).
;

主权项

1. A developer carrying member, comprising:
an electroconductive substrate; an elastic layer on the substrate; and a surface layer covering a surface of the elastic layer, the surface layer containing a modified acrylic urethane resin synthesized from (i) a modified acrylic polyol containing an ester bond, (ii) an isocyanate and (iii) a polyol comprising a structure represented by formula (2), and at least one structure selected from the group consisting of formulae (3) and (4), and having a constituent unit represented by formula (1): in which R1 represents an alkyl group having 1 to 3 carbon atoms, U represents a urethane resin having, between two adjacent urethane bonds, said structure represented by formula (2), and said at least one structure selected from the group consisting of formulae (3) and (4), and L represents a divalent linking group containing an ester bond (—O—C(═O)—) wherein 10.5≦(B)/(A)≦50 when (A) is a number of moles of a hydroxyl group in the modified acrylic polyol and (B) is a number of moles of hydroxyl groups in all polyols other than the modified acrylic polyol.