IP Library › Granted Patent US 10,877,390
Granted Patent B2
US 10,877,390 · App. 16/525,993 · Granted Dec 29, 2020

Toner

Inventors: Tsutomu Shimano (Mishima, JP); Reo Tagawa (Tokyo, JP); Taku Shimoda (Machida, JP); Yoshihiro Nakagawa (Numazu, JP)
Assignee: CANON KABUSHIKI KAISHA
G03G9/09378G03G9/0821G03G9/08711G03G9/08797G03G9/09328G03G9/09364
View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 10,877,390
App. No.
16/525,993
Granted
Dec 29, 2020
Kind
B2
Abstract

Toner, including: a toner particle that contains a binder resin and a wax, wherein the binder resin includes an amorphous resin A, and, in dynamic viscoelasticity measurement of the toner, when the temperature at which the loss elastic modulus G″ measured at a frequency of 1 Hz becomes 1.00×10 6 Pa is set as T(1 Hz), when the temperature at which the loss elastic modulus G″ measured at a frequency of 20 Hz becomes 1.00×10 6 Pa is set as T(20 Hz), and when the maximum value of the ratio (tan δ) of the loss elastic modulus G″ with respect to the storage elastic modulus G′, measured at a frequency of 20 Hz, in a range of from 60° C. to 90° C. is set as tan δ(P), the toner satisfies T(20 Hz)−T(1 Hz)≤7.0° C., 0.80≤tan δ(P)≤1.90, 60° C.≤T(1 Hz)≤80° C., and 60° C.≤T(20 Hz)≤80° C.

Claims (15)

1. A toner, comprising:

a toner particle that contains a binder resin and a wax;

the binder resin including an amorphous resin A having a styrene acrylic polymer segment, a content of resin A in the binder resin being at least 50 mass %;

the wax containing an ester compound selected from the group consisting of an ethylene glycol distearate, an ethylene glycol dipalmitate and an ethylene glycol dibehenate; and

the toner particle having a coat layer on the surface thereof, the coat layer including an amorphous resin B, resin B including a polyester resin and having a glass transition temperature of 60 to 90° C., wherein

T (20 Hz)− T (1 Hz)≤7.0° C.

0.80≤tan δ( P )≤1.90

60° C.≤ T (1 Hz)≤80° C.

60° C.≤ T (20 Hz)≤80° C.

when in dynamic viscoelasticity measurement of the toner, T(1 Hz) is the temperature at which the loss elastic modulus G″ measured at a frequency of 1 Hz becomes 1.00×10 6 Pa and T(20 Hz) is the temperature at which the loss elastic modulus G″ measured at a frequency of 20 Hz becomes 1.00×10 6 Pa, and

tan δ(P) is a maximum value of the ratio (tan δ) of the loss elastic modulus G″ with respect to the storage elastic modulus G′, measured at a frequency of 20 Hz, in a range of 60 to 90° C.

2. The toner according to claim 1 , wherein the thickness of the coat layer is 10 to 200 nm.

3. The toner according to claim 1 , wherein the polyester resin has at least one of a structure represented by —O—CH 2 —CH 2 —O—and a structure represented by —C(═O)—C(═O)—.

4. The toner according to claim 1 , wherein the polyester resin has a structure represented by Formula (A)

5. The toner according to claim 1 , wherein a content of the wax in the toner is 5.0 to 20.0 mass %.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 31, 2019
From: SHIMANO, TSUTOMU; TAGAWA, REO; SHIMODA, TAKU; NAKAGAWA, YOSHIHIRO
To: CANON KABUSHIKI KAISHA
Reel/Frame 050896/0105 →
Priority Claims (2)
JP 2018-146131 · Aug 2, 2018 · national
JP 2019-031467 · Feb 25, 2019 · national
Continuity (1)
Related Publication 20200041922A1 · Feb 6, 2020
Cited By (6)
US 12,187,921 US 12,314,005 US 12,346,064 US 12,405,546 US 12,449,742 US 12,535,750