US 10,459,356 B2Granted

Charging member, process cartridge and electrophotographic image forming apparatus

AssigneeCanon Kabushiki Kaisha

InventorsKineo Takeno, Noriyuki Doi

Life of this patent

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Abstract

A charging member is provided that has high charging ability and can prevent generation of abnormal discharge even under an environment at a low temperature and a low humidity. The charging member includes an electroconductive support, an electroconductive elastic layer and a surface layer. The electroconductive elastic layer contains electrically insulating domains such that at least a part of the electrically insulating domains is exposed on the surface of the electroconductive elastic layer. The surface layer contains a polymetalloxane having a structure represented by Structural Formula (a1), and M1 in Structural Formula (a1) and a carbon atom in a structural unit represented by Structural Formula (a2) are bonded through a linking group represented by Structural Formula (a3).

Claims12

Dependent claims

A charging member comprising:

an electroconductive support;
an electroconductive elastic layer;
and
a surface layer,
the electroconductive elastic layer containing electrically insulating domains such that at least a part of the electrically insulating domains is exposed on a surface of the electroconductive elastic layer,
the surface layer containing a polymetalloxane having a structure represented by Structural Formula (a1);
wherein M1 in Structural Formula (a1) is bonded to a carbon atom in a structural unit represented by Structural Formula (a2) with a linking group represented by Structural Formula (a3):
where in Structural Formula (a1),
M1 represents a metal atom selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, W, Al, Ga, In and Ge;
in the case that M1 is Al, Ga or In, then k=3;
in the case that M1 is Ti, Zr, Hf or Ge, then k=4;
in the case that M1 is Nb, Ta or W, then k=5;
in the case that M1 is V, then k=3 or 5;
s represents an integer of 0 or more and (k−2) or less;
and
L1 represents a ligand having a structure represented by Formula (b) or a ligand having a structure represented by Formula (c);
where in Formula (b),
X1 represents a structure represented by one of Formulae (1) to (4);
Y1 represents a group having a site of coordination with M1 in Structural Formula (a1);
A1 represents a direct bond or an atomic group needed to form a 4- to 8-membered ring with M1, X1 and Y1;
and
a symbol “**” represents a site of bonding to or coordination with M1;
where in Formulae (1) to (4),
a symbol “**” represents a site of bonding to M1 in Structural Formula (a1);
and
a symbol “***” represents a site of bonding to A1 in Formula (b);
where in Formula (c),
R11 to R15 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a trimethylsilyl group;
and
a symbol “****” represents a site of coordination with M1 in Structural Formula (a1);
where in Structural Formula (a2),
R1 to R3 each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms;
and
a symbol “*1” represents a site of bonding to Z in Structural Formula (a3);
and
where in Structural Formula (a3),
Z represents a substituted or unsubstituted phenylene group, provided that the substituent in the substituted phenylene group is a halogen atom or an alkyl group having 1 to 3 carbon atoms;
a symbol “*1” represents a site of bonding to the symbol “*1” in Structural Formula (a2);
and
a symbol “*2” represents a site of bonding to M1 in Structural Formula (a1).

37 more elements

A process cartridge detachably attachable to a main body of an electrophotographic apparatus, the process cartridge integrally supporting an electrophotographic photosensitive member and a charging member for charging the surface of the electrophotographic photosensitive member,

the charging member comprising
an electroconductive support, an electroconductive elastic layer and a surface layer,
the electroconductive elastic layer containing electrically insulating domains such that at least a part of the electrically insulating domains is exposed on the surface of the electroconductive elastic layer, and
the surface layer containing a polymetalloxane having a structure represented by Structural Formula (a1);
wherein M1 in Structural Formula (a1) is bonded to a carbon atom in a structural unit represented by Structural Formula (a2) with a linking group represented by Structural Formula (a3):
where in Structural Formula (a1),
M1 represents a metal atom selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, W, Al, Ga, In and Ge;
in the case that M1 is Al, Ga or In, then k=3;
in the case that M1 is Ti, Zr, Hf or Ge, then k=4;
in the case that M1 is Nb, Ta or W, then k=5;
in the case that M1 is V, then k=3 or 5;
s represents an integer of 0 or more and (k−2) or less;
and
L1 represents a ligand having a structure represented by Formula (b) or a ligand having a structure represented by Formula (c);
where in Formula (b),
X1 represents a structure represented by one of Formulae to (4);
Y1 represents a group having a site of coordination with M1 in Structural Formula (a1);
A1 represents a direct bond or an atomic group needed to form a 4- to 8-membered ring with M1, X1 and Y1;
and
a symbol “**” represents a site of bonding to or coordination with M1;
where in Formulae (1) to (4),
a symbol “**” represents a site of bonding to M1 in Structural Formula (a1);
and
a symbol “***” represents a site of bonding to A1 in Formula (b);
where in Formula (c),
R11 to R15 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a trimethylsilyl group;
and
a symbol “****” represents a site of coordination with M1 in Structural Formula (a1);
where in Structural Formula (a2),
R1 to R3 each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms;
and
a symbol “1” represents a site of bonding to Z in Structural Formula (a3);
and
where in Structural Formula (a3),
Z represents a substituted or unsubstituted phenylene group, provided that the substituent in the substituted phenylene group is a halogen atom or an alkyl group having 1 to 3 carbon atoms;
a symbol “*1” represents a site of bonding to the symbol “*1” in Structural Formula (a2);
and
a symbol “*2” represents a site of bonding to M1 in Structural Formula (a1).

35 more elements

An electrophotographic apparatus comprising an electrophotographic photosensitive member and a charging member for charging the surface of the electrophotographic photosensitive member,

wherein the charging member comprising
an electroconductive support, an electroconductive elastic layer and a surface layer,
the electroconductive elastic layer containing electrically insulating domains such that at least a part of the electrically insulating domains is exposed on the surface of the electroconductive elastic layer, and
the surface layer containing a polymetalloxane having a structure represented by Structural Formula (a1);
wherein M1 in Structural Formula (a1) is bonded to a carbon atom in a structural unit represented by Structural Formula (a2) with a linking group represented by Structural Formula (a3):
where in Structural Formula (a1),
M1 represents a metal atom selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, W, Al, Ga, In and Ge;
in the case that M1 is Al, Ga or In, then k=3;
in the case that M1 is Ti, Zr, Hf or Ge, then k=4;
in the case that M1 is Nb, Ta or W, then k=5;
in the case that M1 is V, then k=3 or 5;
s represents an integer of 0 or more and (k−2) or less;
and
L1 represents a ligand having a structure represented by Formula (b) or a ligand having a structure represented by Formula (c);
where in Formula (b),
X1 represents a structure represented by one of Formulae (1) to (4);
Y1 represents a group having a site of coordination with M1 in Structural Formula (a1);
A1 represents a direct bond or an atomic group needed to form a 4- to 8-membered ring with M1, X1 and Y1;
and
a symbol “**” represents a site of bonding to or coordination with M1;
where in Formulae (1) to (4),
a symbol “**” represents a site of bonding to M1 in Structural Formula (a1);
and
a symbol “***” represents a site of bonding to A1 in Formula (b);
where in Formula (c),
R11 to R15 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a trimethylsilyl group;
and
a symbol “****” represents a site of coordination with M1 in Structural Formula (a1);
where in Structural Formula (a2),
R1 to R3 each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms;
and
a symbol “*1” represents a site of bonding to Z in Structural Formula (a3);
and
where in Structural Formula (a3),
Z represents a substituted or unsubstituted phenylene group, provided that the substituent in the substituted phenylene group is a halogen atom or an alkyl group having 1 to 3 carbon atoms;
a symbol “*1” represents a site of bonding to the symbol “*1” in Structural Formula (a2);
and
a symbol “*2” represents a site of bonding to M1 in Structural Formula (a1).

35 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/716,666Filed 27 Sep 2017
Priority: JP 2016-1992717 Oct 2016
Published: US 2018/0101106 A112 Apr 2018
Granted: 29 Oct 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G03G 5/0662
Characterised by the photoconductive material being organic: containing metal elements
G03G 5/0622
Characterised by the photoconductive material being organic: heterocyclic compounds
G03G 15/0233
By bringing a charging member into contact with the member to be charged, e.g. roller, brush chargers: structure, details of the charging member,…
G03G
Electrography