# US 9,436,111 B1 · Electrostatic charge image developing toner, electrostatic charge image developer, and toner cartridge > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,436,111 B1 - Document ID: US9436111B1 - Status: Granted - Kind: B1 - Application number: 14/807,525 - Filed: 2015-07-23 - Published: 2016-09-29 - Granted: 2016-09-06 - Earliest claimed: 2015-03-26 - Assignees: Fuji Xerox Co., Ltd. - Applicants: Fuji Xerox Co., Ltd. - Inventors: Kazusei Yoshida; Hirofumi Shiozaki; Shinpei Takagi - Web page: https://patentgrep.com/patent/US9436111B1 ## CPC - G03G 9/09371: {obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds} - G03G 9/09328: {obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds} - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract An electrostatic charge image developing toner includes a toner particle including a core which contains a styrene (meth)acrylic modified polyester resin and a colorant, and a shell layer which covers the core and contains a styrene (meth)acrylic modified polyester resin and a release agent. ## Claims ### Claim 1 An electrostatic charge image developing toner comprising: a toner particle including a core which contains a styrene (meth)acrylic modified polyester resin and a colorant, and a shell layer which covers the core and contains a styrene (meth)acrylic modified polyester resin and a release agent. ### Claim 2 (depends on 1) The electrostatic charge image developing toner according to claim 1, wherein the core further contains a crystalline polyester resin. ### Claim 3 (depends on 2) The electrostatic charge image developing toner according to claim 2, wherein a weight ratio of the crystalline polyester resin based on a resin component contained in the toner particle is in a range of from 10% by weight to 30% by weight. ### Claim 4 (depends on 1) The electrostatic charge image developing toner according to claim 1, wherein a weight ratio of the release agent based on the toner particle is in a range of from 2% by weight to 5% by weight. ### Claim 5 (depends on 1) The electrostatic charge image developing toner according to claim 1, wherein a weight ratio of the release agent contained in the shell layer based on the release agent contained in the toner particle is in a range of from 70% by weight to 100% by weight. ### Claim 6 (depends on 2) The electrostatic charge image developing toner according to claim 2, wherein a weight ratio of the release agent contained in the shell layer based on the release agent contained in the toner particle is in a range of from 70% by weight to 100% by weight. ### Claim 7 (depends on 1) The electrostatic charge image developing toner according to claim 1, wherein the styrene (meth)acrylic modified polyester resin contains a polyester resin segment and a styrene (meth)acrylic resin segment, and a weight ratio of the polyester resin segment and the styrene (meth)acrylic resin segment (polyester resin segment/styrene (meth)acrylic resin segment) is in a range of from 60/40 to 95/5. ### Claim 8 (depends on 1) An electrostatic charge image developer comprising: a toner; and a carrier, wherein the toner is the electrostatic charge image developing toner according to claim 1. ### Claim 9 (depends on 8) The electrostatic charge image developer according to claim 8, wherein the core of the toner particle further contains a crystalline polyester resin. ### Claim 10 (depends on 9) The electrostatic charge image developer according to claim 9, wherein a weight ratio of the crystalline polyester resin based on the resin component contained in the toner particle is in a range of from 10% by weight to 30% by weight. ### Claim 11 (depends on 8) The electrostatic charge image developer according to claim 8, wherein a weight ratio of the release agent contained in the shell layer based on the release agent contained in the toner particle is in a range of from 70% by weight to 100% by weight. ### Claim 12 (depends on 8) The electrostatic charge image developer according to claim 8, wherein the styrene (meth)acrylic modified polyester resin contained in the shell layer of the toner particle contains a polyester resin segment and a styrene (meth)acrylic resin segment, and a weight ratio of the polyester resin segment and the styrene (meth)acrylic resin segment (polyester resin segment/styrene (meth)acrylic resin segment) is in a range of from 60/40 to 95/5. ### Claim 13 (depends on 1) A toner cartridge which is detachable from an image forming apparatus and contains the electrostatic charge image developing toner according to claim 1. ### Claim 14 (depends on 13) The toner cartridge according to claim 13, wherein the core of the toner particle further contains a crystalline polyester resin. ### Claim 15 (depends on 13) The toner cartridge according to claim 13, wherein a weight ratio of the crystalline polyester resin based on the resin component contained in the toner particle is in a range of from 10% by weight to 30% by weight. ### Claim 16 (depends on 13) The toner cartridge according to claim 13, wherein a weight ratio of the release agent contained in the shell layer based on the release agent contained in the toner particle is in a range of from 70% by weight to 100% by weight. ### Claim 17 (depends on 13) The toner cartridge according to claim 13, wherein the styrene (meth)acrylic modified polyester resin contained in the shell layer of the toner particle contains a polyester resin segment and a styrene (meth)acrylic resin segment, and a weight ratio of the polyester resin segment and the styrene (meth)acrylic resin segment (polyester resin segment/styrene (meth)acrylic resin segment) is in a range of from 60/40 to 95/5.