Toner and image-forming system
AssigneeSeiko Epson Corporation
InventorsRie Miyazaki, Takuya Kadota, Hidehiro Takano
Life of this patent
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Abstract
The present invention provides a toner capable of effectively controlling hot offset of a toner in fixing characteristics, while effectively preventing the winding of a recording medium round a fixing member.
Claims9
A toner for use in an image-forming apparatus equipped with an oil-less fixing unit comprising a main heating member and a pressing member, the main heating member gets in contact with an unfixed toner surface on a recording medium and fixes the unfixed toner at a nip part of the main heating member and the pressing member, the main heating member and the pressing member define a boundary surface thereof, and the surface takes a configuration protruding toward the pressing member side,
- wherein the toner comprises a resin comprising a block polyester and an amorphous polyester, and
- the toner has an initial relaxation modulus G (t=0.01) (Pa) of the toner at 120° C., in relaxation time of 0.01 (sec), of G (t=0.01) [Pa]≧1.0×105 [Pa].
A toner for use in an image-forming apparatus equipped with an oil-less fixing unit comprising a main heating member and a pressing member, the main heating member gets in contact with an unfixed toner surface on a recording medium and fixes the unfixed toner at a nip part of the main heating member and the pressing member, the main heating member and the pressing member define a boundary surface thereof, and the surface takes a configuration protruding toward the side of the main heating member,
- wherein the toner comprises a resin comprising a block polyester and an amorphous polyester, and
- the toner has a loss tangent tan δ (=G″/G′) of the toner, a ratio of loss modulus G″ to storage modulus G′ in dynamic relaxation modulus, of from 1.7 to 5.0 at 120° C.
A toner for use in an image-forming apparatus equipped with an oil-less fixing unit comprising a main heating member and a pressing member, the main heating member gets in contact with an unfixed toner surface on a recording medium and fixes the unfixed toner at a nip part of the main heating member and the pressing member, the main heating member and the pressing member define a boundary surface thereof, and the surface takes a configuration of flat surface,
- wherein the toner comprises a resin comprising a block polyester and an amorphous polyester,
- the toner has a larger value of loss tangent tan δ (=G″/G′) of the toner, the ratio of loss modulus G″ to storage modulus G′ in dynamic relaxation modulus, at 180° C. than a value of tan δ at 110° C.,
- wherein the difference between the values of tan δ at 180° C. and 110° C. is 1 or more.
An image-forming system comprising:
- an image-forming apparatus;
- and
- a toner,
- wherein said image-forming apparatus is equipped with an oil-less fixing unit comprising a main heating member and a pressing member, the main heating member gets in contact with an unfixed toner surface on a recording medium and fixes the unfixed toner at a nip part of the main heating member and the pressing member, the main heating member and the pressing member define a boundary surface thereof, and the surface takes a configuration protruding toward the pressing member side, and
- said toner comprises a resin comprising a block polyester and an amorphous polyester, and has an initial relaxation modulus G (t=0.01) (Pa) of the toner at 120° C., in relaxation time of 0.01 (sec), of G (t=0.01) [Pa]≧1.01×105 [Pa].
An image-forming system comprising:
- an image-forming apparatus;
- and
- a toner,
- wherein said image-forming apparatus is equipped with an oil-less fixing unit comprising a main heating member and a pressing member, the main heating member gets in contact with an unfixed toner surface on a recording medium and fixes the unfixed toner at a nip part of the main heating member and the pressing member, the main heating member and the pressing member define a boundary surface thereof, and the surface takes a configuration protruding toward the side of the main heating member, and
- said toner comprises a resin comprising a block polyester and an amorphous polyester, and has a loss tangent tan δ (=G″/G′) of the toner, a ratio of loss modulus G″ to storage modulus G′ in dynamic relaxation modulus, of from 1.7 to 5.0 at 120° C.
An image-forming system comprising:
- an image-forming apparatus;
- and
- a toner,
- wherein said image-forming apparatus is equipped with an oil-less fixing unit comprising a main heating member and a pressing member, the main heating member gets in contact with an unfixed toner surface on a recording medium and fixes the unfixed toner at a nip part of the main heating member and the pressing member, the main heating member and the pressing member define a boundary surface thereof, and the surface takes a configuration of fiat surface, and
- said toner comprises a resin comprising a block polyester and an amorphous polyester, and has a larger value of loss tangent tan δ (=G″/G′) of the toner, the ratio of loss modulus G″ to storage modulus G′ in dynamic relaxation modulus, at 180° C. than a value of tan δ at 110° C.
- wherein the difference between the values of tan δ at 180° C. and 110° C. is 1 or more.
Dependencies are inferred from the claim text.