Patents by Inventor Sakiko HIRAI
Sakiko HIRAI has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Publication number: 20210109454Abstract: Provided is a toner including toner particles. The toner particles has a volume particle diameter distribution index on a side of the largest diameter (GSDv (90/50)) of 1.26 or less; a number particle diameter distribution index on a side of the smallest diameter (GSDp (50/10)) of 1.28 or less; GSDv (90/50)/GSDp (50/10) of from 0.96 to 1.01; and an average circularity of 0.95 or more and 1.00 or less.Type: ApplicationFiled: December 22, 2020Publication date: April 15, 2021Applicant: FUJI XEROX CO., LTD.Inventors: Atsushi SUGAWARA, Satoshi MIURA, Akira MATSUMOTO, Sakiko HIRAI, Yasuo KADOKURA
-
Patent number: 10908523Abstract: Provided is a toner including toner particles. The toner particles has a volume particle diameter distribution index on a side of the largest diameter (GSDv (90/50)) of 1.26 or less; a number particle diameter distribution index on a side of the smallest diameter (GSDp (50/10)) of 1.28 or less; GSDv (90/50)/GSDp (50/10) of from 0.96 to 1.01; and an average circularity of 0.95 or more and 1.00 or less.Type: GrantFiled: May 24, 2018Date of Patent: February 2, 2021Assignee: FUJI XEROX CO., LTD.Inventors: Atsushi Sugawara, Satoshi Miura, Akira Matsumoto, Sakiko Hirai, Yasuo Kadokura
-
Patent number: 10761444Abstract: An electrostatic charge image development toner satisfies the following: a maximum slope of an absolute value of log (loss modulus G?) from 60° C. to 90° C. is 0.07 or more and 0.16 or less; a maximum slope of an absolute value of log (loss modulus G?) from 90° C. to 130° C. is 0.08 or less; and G?(60) is 5.0×107 Pa or more and 1.0×1010 Pa or less, where G?(60) is a loss modulus at 60° C.Type: GrantFiled: January 29, 2019Date of Patent: September 1, 2020Assignee: FUJI XEROX CO., LTD.Inventors: Atsushi Sugawara, Yasuo Kadokura, Daisuke Tomita, Sakiko Hirai, Satoshi Miura
-
Patent number: 10719022Abstract: An electrostatic charge image developing toner has a surface property index value represented by Formula S of 2.0 to 2.8, an electrostatic charge image developing toner has a surface property index value represented by Formula S of more than 2.8 and 3.5 or less, and an electrostatic charge image developing toner has a surface property index value represented by Formula S of more than 1.0 and less than 2.0 and a calculated value of a specific surface area in Formula S of 0.70 to 1.3: (Surface property index value)=(Measured value of specific surface area)/(Calculated value of specific surface area)??Formula S wherein (Calculated value of specific surface area)=(Sum of surface areas calculated from equivalent circle diameters of 4,500 toner particles in flow particle image analysis)/{(Specific gravity of toner)×(Sum of volumes calculated from equivalent circle diameters of 4,500 toner particles in flow particle image analysis)}.Type: GrantFiled: August 14, 2018Date of Patent: July 21, 2020Assignee: FUJI XEROX CO., LTD.Inventors: Yasuo Kadokura, Atsushi Sugawara, Daisuke Tomita, Sakiko Hirai, Satoshi Miura, Akira Matsumoto
-
Publication number: 20200089137Abstract: An electrostatic charge image development toner satisfies the following: a maximum slope of an absolute value of log (loss modulus G?) from 60° C. to 90° C. is 0.07 or more and 0.16 or less; a maximum slope of an absolute value of log (loss modulus G?) from 90° C. to 130° C. is 0.08 or less; and G?(60) is 5.0×107 Pa or more and 1.0×1010 Pa or less, where G?(60) is a loss modulus at 60° C.Type: ApplicationFiled: January 29, 2019Publication date: March 19, 2020Applicant: FUJI XEROX CO., LTD.Inventors: Atsushi SUGAWARA, Yasuo KADOKURA, Daisuke TOMITA, Sakiko HIRAI, Satoshi MIURA
-
Publication number: 20200089138Abstract: An electrostatic charge image development toner satisfies the following: (ln ?(T1)?ln ?(T2))/(T1?T2) is ?0.14 or less, (ln ?(T2)?ln ?(T3))/(T2?T3) is ?0.15 or more, and (ln ?(T2)?ln ?(T3))/(T2?T3) is more than (ln ?(T1)?ln ?(T2))/(T1?T2), where ?(T1) represents a viscosity ? of the toner at T1=60° C., ?(T2) represents a viscosity ? of the toner at T2=90° C., and ?(T3) represents a viscosity ? of the toner at T3=130° C.Type: ApplicationFiled: January 24, 2019Publication date: March 19, 2020Applicant: FUJI XEROX CO., LTD.Inventors: Yasuo KADOKURA, Atsushi SUGAWARA, Daisuke TOMITA, Sakiko HIRAI, Satoshi MIURA
-
Publication number: 20190317417Abstract: An electrostatic charge image developing toner includes a styrene-acrylic resin and exhibits a z average molecular weight Mz of 80,000 to 400,000 and a molecular weight distribution curve satisfying Expression (1): 1.3?b/a?2.0, and an electrostatic charge image developing toner includes a styrene-acrylic resin, and exhibits a z average molecular weight Mz of 100,000 to 400,000 and a molecular weight distribution curve satisfying Expression (A): 0.75?(c+d)/(2×d)?0.95, wherein a, b, c and d are defined in the specification.Type: ApplicationFiled: August 30, 2018Publication date: October 17, 2019Applicant: FUJI XEROX CO., LTD.Inventors: Atsushi SUGAWARA, Sakiko HIRAI, Yasuo KADOKURA, Daisuke TOMITA, Satoshi MIURA
-
Publication number: 20190294062Abstract: An electrostatic charge image developing toner has a surface property index value represented by Formula S of 2.0 to 2.8, an electrostatic charge image developing toner has a surface property index value represented by Formula S of more than 2.8 and 3.5 or less, and an electrostatic charge image developing toner has a surface property index value represented by Formula S of more than 1.0 and less than 2.0 and a calculated value of a specific surface area in Formula S of 0.70 to 1.3: (Surface property index value)=(Measured value of specific surface area)/(Calculated value of specific surface area)??Formula S wherein (Calculated value of specific surface area)=(Sum of surface areas calculated from equivalent circle diameters of 4,500 toner particles in flow type particle image analysis)/{((Specific gravity of toner)×(Sum of volumes calculated from equivalent circle diameters of 4,500 toner particles in flow type particle image analysis)}.Type: ApplicationFiled: August 14, 2018Publication date: September 26, 2019Applicant: FUJI XEROX CO., LTD.Inventors: Yasuo KADOKURA, Atsushi SUGAWARA, Daisuke TOMITA, Sakiko HIRAI, Satoshi MIURA, Akira MATSUMOTO
-
Patent number: 10423088Abstract: An electrostatic charge image developing toner includes a styrene-acrylic resin and exhibits a z average molecular weight Mz of 80,000 to 400,000 and a molecular weight distribution curve satisfying Expression (1): 1.3?b/a?2.0, and an electrostatic charge image developing toner includes a styrene-acrylic resin, and exhibits a z average molecular weight Mz of 100,000 to 400,000 and a molecular weight distribution curve satisfying Expression (A): 0.75?(c+d)/(2×d)?0.95, wherein a, b, c and d are defined in the specification.Type: GrantFiled: August 30, 2018Date of Patent: September 24, 2019Assignee: FUJI XEROX CO., LTD.Inventors: Atsushi Sugawara, Sakiko Hirai, Yasuo Kadokura, Daisuke Tomita, Satoshi Miura
-
Publication number: 20190094728Abstract: Provided is a toner including toner particles. The toner particles has a volume particle diameter distribution index on a side of the largest diameter (GSDv (90/50)) of 1.26 or less; a number particle diameter distribution index on a side of the smallest diameter (GSDp (50/10)) of 1.28 or less; GSDv (90/50)/GSDp (50/10) of from 0.96 to 1.01; and an average circularity of 0.95 or more and 1.00 or less.Type: ApplicationFiled: May 24, 2018Publication date: March 28, 2019Applicant: FUJI XEROX CO., LTD.Inventors: Atsushi SUGAWARA, Satoshi MIURA, Akira MATSUMOTO, Sakiko HIRAI, Yasuo KADOKURA
-
Patent number: 10095142Abstract: A brilliant toner includes toner particles that contain a binder resin and a brilliant pigment which has a flake shape, wherein an average thickness of the brilliant pigment is greater than 0.5 ?m to 1.5 ?m.Type: GrantFiled: July 19, 2016Date of Patent: October 9, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Sakiko Hirai, Satomi Hara, Masaru Takahashi, Atsushi Sugawara
-
Patent number: 9989872Abstract: An electrostatic charge image developing toner includes toner particles each including an amorphous resin and a crystalline resin, wherein, when the toner particles are subjected to a measurement to determine an area ratio of the crystalline resin on a cross section of the toner particle before and after being heated at a temperature of 50° C. and a humidity of 50% RH for three days, a relationship between an area ratio a (%) of the crystalline resin on a cross section with respect to the toner particles before being heated, and an area ratio b (%) of the crystalline resin on the cross section with respect to the toner particles after being heated satisfies Expression (1): 0.9?a/b?1.0.Type: GrantFiled: April 20, 2017Date of Patent: June 5, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Yukiaki Nakamura, Akira Matsumoto, Yasuo Kadokura, Shinya Nakashima, Satoshi Miura, Sakiko Hirai, Shotaro Takahashi, Daisuke Tomita, Satoshi Kamiwaki, Masaru Takahashi
-
Publication number: 20180059563Abstract: An electrostatic charge image developing toner includes toner particles each including an amorphous resin and a crystalline resin, wherein, when the toner particles are subjected to a measurement to determine an area ratio of the crystalline resin on a cross section of the toner particle before and after being heated at a temperature of 50° C. and a humidity of 50% RH for three days, a relationship between an area ratio a (%) of the crystalline resin on a cross section with respect to the toner particles before being heated, and an area ratio b (%) of the crystalline resin on the cross section with respect to the toner particles after being heated satisfies Expression (1): 0.9?a/b?1.0.Type: ApplicationFiled: April 20, 2017Publication date: March 1, 2018Applicant: FUJI XEROX CO., LTD.Inventors: Yukiaki NAKAMURA, Akira MATSUMOTO, Yasuo KADOKURA, Shinya NAKASHIMA, Satoshi MIURA, Sakiko HIRAI, Shotaro TAKAHASHI, Daisuke TOMITA, Satoshi KAMIWAKI, Masaru TAKAHASHI
-
Patent number: 9891555Abstract: An electrostatic charge image developing toner set includes a brilliant toner including toner particles that include a brilliant pigment and a first binder resin, a black toner including toner particles that include a second binder resin, and a color toner except a black toner, including toner particles that include a third binder resin, wherein the brilliant toner, the black toner and the color toner satisfy Expression (1): Dielectric loss factor of the brilliant Toner>Dielectric loss factor of the black toner>Dielectric loss factor of the color toner and Expression (2): 25×10?3?(Dielectric loss factor of the brilliant toner)?(Dielectric loss factor of the color toner)?95×10?3.Type: GrantFiled: July 28, 2016Date of Patent: February 13, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Satomi Hara, Masaru Takahashi, Atsushi Sugawara, Sakiko Hirai
-
Patent number: 9864288Abstract: A toner set includes a brilliant toner including a brilliant pigment; and a chromatic toner including a coloring agent that is different from the brilliant pigment, wherein the toner set satisfies the following expression: 1.2?Q1/Q2?5.0 wherein Q1 represents an endothermic quantity of the brilliant toner and Q2 represents an endothermic quantity of the chromatic toner.Type: GrantFiled: July 2, 2015Date of Patent: January 9, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Shotaro Takahashi, Atsushi Sugitate, Masaru Takahashi, Sakiko Hirai, Satomi Hara
-
Patent number: 9841693Abstract: A brilliant toner includes release agent domains meeting conditions (1) a length of the release agent domain in a longitudinal axis direction is 300 nm to 1,500 nm, (2) a ratio between the length in the longitudinal axis direction and in a short axis direction of the release agent domain is 3.0 to 15.0, (3) an angle between (a) a tangent line passing through a contact point of (a1) a circumference of a circle that is centered at a centroid of the release agent domain and is inscribed in an outer edge of the toner particle and (a2) the outer edge and (b) a line passing through the centroid and extending in the longitudinal axis direction is 0° to 45°, and (4) a ratio of a distance between the centroid and the contact point to an equivalent circle diameter of the toner particle is 0.03 to 0.25.Type: GrantFiled: July 20, 2016Date of Patent: December 12, 2017Assignee: FUJI XEROX CO., LTD.Inventors: Atsushi Sugawara, Sakiko Hirai, Masaru Takahashi, Satomi Hara
-
Publication number: 20170285518Abstract: An electrostatic charge image developing toner set includes a brilliant toner including toner particles that include a brilliant pigment and a first binder resin, a black toner including toner particles that include a second binder resin, and a color toner except a black toner, including toner particles that include a third binder resin, wherein the brilliant toner, the black toner and the color toner satisfy Expression (1): Dielectric loss factor of the brilliant Toner>Dielectric loss factor of the black toner>Dielectric loss factor of the color toner and Expression (2): 25×10?3?(Dielectric loss factor of the brilliant toner)?(Dielectric loss factor of the color toner)?95×10?3.Type: ApplicationFiled: July 28, 2016Publication date: October 5, 2017Applicant: FUJI XEROX CO., LTD.Inventors: Satomi HARA, Masaru TAKAHASHI, Atsushi SUGAWARA, Sakiko HIRAI
-
Publication number: 20170255118Abstract: A brilliant toner includes toner particles that contain a binder resin and a brilliant pigment, wherein a water surface diffusion area, which is defined by JIS K5906:2009, of the brilliant pigment is from 5 m2/g to 20 m2/g and an average longitudinal length of the brilliant pigment is from 0.5 ?m to 10 ?m.Type: ApplicationFiled: July 21, 2016Publication date: September 7, 2017Applicant: FUJI XEROX CO., LTD.Inventors: Masaru TAKAHASHI, Satomi HARA, Sakiko HIRAI, Atsushi SUGAWARA
-
Publication number: 20170255117Abstract: A brilliant toner includes toner particles that contain a binder resin and a brilliant pigment which has a flake shape, wherein an average thickness of the brilliant pigment is greater than 0.5 ?m to 1.5 ?m.Type: ApplicationFiled: July 19, 2016Publication date: September 7, 2017Applicant: FUJI XEROX CO., LTD.Inventors: Sakiko HIRAI, Satomi HARA, Masaru TAKAHASHI, Atsushi SUGAWARA
-
Publication number: 20170227873Abstract: A brilliant toner includes release agent domains meeting conditions (1) a length of the release agent domain in a longitudinal axis direction is 300 nm to 1,500 nm, (2) a ratio between the length in the longitudinal axis direction and in a short axis direction of the release agent domain is 3.0 to 15.0, (3) an angle between (a) a tangent line passing through a contact point of (a1) a circumference of a circle that is centered at a centroid of the release agent domain and is inscribed in an outer edge of the toner particle and (a2) the outer edge and (b) a line passing through the centroid and extending in the longitudinal axis direction is 0° to 45°, and (4) a ratio of a distance between the centroid and the contact point to an equivalent circle diameter of the toner particle is 0.03 to 0.25.Type: ApplicationFiled: July 20, 2016Publication date: August 10, 2017Applicant: FUJI XEROX CO., LTD.Inventors: Atsushi SUGAWARA, Sakiko HIRAI, Masaru TAKAHASHI, Satomi HARA