# US 2013/0157191 A1 · Toner for electrophotography and image-forming method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0157191 A1 - Document ID: US20130157191A1 - Status: Published application - Kind: A1 - Application number: 13/819,854 - Filed: 2011-07-19 - Published: 2013-06-20 - Earliest claimed: 2010-09-14 - Assignees: Konica Minolat Business Technologies, Inc. - Inventors: Kimihiko Ookubo; Ryohei Iwamoto; Keigo Tamaki; Yutaro Hakoi - Web page: https://patentgrep.com/patent/US20130157191A1 ## CPC - G03G 9/0906: {Organic dyes} - G03G 9/0821: {characterised by physical parameters (magnetic parameters G03G9/083)} - G03G 9/0914: {Acridine; Azine; Oxazine; Thiazine-;(Xanthene-) dyes} - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract The present invention provides a toner for electrophotography capable of achieving high color reproducibility in a wide brightness region ranging from high to low brightness. This toner for electrophotography containing a compound represented by general formula (X-1) is characterized in that when the toner image formed exclusively from the toner is at maximum saturation, the hue angle (H) of the toner in a CIE L*a*b* color space is within the range of 341°≦H≦351°. [Formula 1] (In the formula: one of Rx1 and Rx2 is a methyl group or an ethyl group, while the other represents an alkyl group with C12 or less optionally substituted by a group including an oxygen atom, or a 5- or 6-membered aliphatic ring optionally substituted by a group including an oxygen atom connecting a nitrogen atom and Rx1 and Rx2; and GX2 represents an alkyl group optionally substituted by a group including an oxygen atom.) ## Claims ### Claim 1 An electrophotographic toner comprising a compound represented by Formula (X-1), wherein a hue angle (H) of the toner in CIE L*a*b* color space is in the range of: 341°≦H≦351°, when a toner image formed only with the toner exhibits a maximum chroma, wherein, one of Rx1 and Rx2 represents a methyl group or an ethyl group, and another one of Rx1 and Rx2 represents an alkyl group having 12 or less carbon atoms which may be substituted with an oxygen-containing group, or Rx1 and Rx2 represent a 5- or 6-membered heterocyclic ring which may be substituted with an oxygen-containing group by combining Rx1 and Rx2 with a nitrogen atom; and GX2 represents an alkyl group which may be substituted with an oxygen-containing group. ### Claim 2 (depends on 1) The electrophotographic toner described in claim 1, wherein the toner further contains a pigment having a quinacridone structure in addition to the compound represented by Formula (X-1); and a hue angle (H) of the toner in CIE L*a*b* color space is in the range of: 341°≦H≦351°, when a toner image formed only with the toner exhibits a maximum chroma. ### Claim 3 (depends on 1) The electrophotographic toner described in claim 1, wherein the toner further contains a compound represented by Formula (1) in addition to the compound represented by Formula (X-1); and a hue angle (H) of the toner in CIE L*a*b* color space is in the range of: 341°≦H≦351°, when a toner image formed only with the toner exhibits a maximum chroma, wherein R1 represents an alkyl group; R2 represents a hydrogen atom, an alkoxycarbonyl group, an aryloxycarbonyl group, a sulfamoyl group, a sulfinyl group, an alkylsulfonyl group, an arylsulfonyl group, an acyl group, a halogen atom, or a cyano group; and R3 represents a group containing an aromatic hydrocarbon structure having 9 or more carbon atoms. ### Claim 4 An electrophotographic toner comprising a compound represented by Formula (X-1b), Formula (X-1b) wherein one of Rx1b and Rx2b represents a methyl group or an ethyl group, and another one of Rx1b and Rx2b represents an alkyl group having 4 or less carbon atoms which may be substituted with an oxygen-containing group, provided that a sum of carbon atoms of Rx1b and Rx2b is an integer of 3 to 5, or Rx1b and Rx2b represent a 5- or 6-membered heterocyclic ring which may be substituted with an oxygen-containing group by combining Rx1b and Rx2b with a nitrogen atom. ### Claim 5 (depends on 4) The electrophotographic toner described in claim 4, wherein a hue angle (H) of the toner in CIE L*a*b* color space is in the range of: 341°≦H≦351°, when a toner image formed only with the toner exhibits a maximum chroma. ### Claim 6 (depends on 1) The electrophotographic toner, wherein the toner image formed only with the toner described in claim 1 is formed by fixing using a heat roller fixing method composing a heat roller and a pressure roller. ### Claim 7 (depends on 1) The electrophotographic toner, wherein the toner image formed only with the toner described in claim 1 is formed by being developed under the following conditions, surface electric potential of a photoreceptor: −700 V DC bias: −500 V distance between a photoreceptor and a developing sleeve: 600 μm regulation of a developer layer: magnetic H-Cut method developer layer thickness: 700 μm developing sleeve diameter: 40 mm. ### Claim 8 (depends on 1) The electrophotogaphic toner, wherein the toner image formed only with the toner described in claim 1 is formed by being transferred on a transfer material having a glossiness of 5 to 80. ### Claim 9 (depends on 1) A method for forming an image using the electrophotographic toner described in claim 1. ### Claim 10 (depends on 1) The electrophotographic toner described in claim 1, wherein one of Rx1 and Rx2 in Formula (X-1) represents a methyl group or an ethyl group, and another one of Rx1 and Rx2 represents an alkyl group having 6 or less carbon atoms which may be substituted with an oxygen-containing group. ### Claim 11 (depends on 1) The electrophotographic toner described in claim 1, wherein one of Rx1 and Rx2 in Formula (X-1) represents a methyl group or an ethyl group, and another one of Rx1 and Rx2 represents an alkyl group having 4 or less carbon atoms which may be substituted with an oxygen-containing group. ### Claim 12 (depends on 1) The electrophotographic toner described in claim 1, wherein GX2 in Formula (X-1) represents an alkyl group having 1 to 5 carbon atoms which may be substituted with an oxygen-containing group. ### Claim 13 (depends on 1) The electrophotographic toner described in claim 1, wherein GX2 in Formula (X-1) represents a methyl group or an ethyl group. ### Claim 14 (depends on 4) The electrophotographic toner described in claim 4, wherein one of Rx1b and Rx2b in Formula (X-1b) represents a methyl group or an ethyl group, and another one of Rx1b and Rx2b represents an alkyl group having 3 or less carbon atoms which may be substituted with an oxygen-containing group, provided that a sum of carbon atoms of Rx1b and Rx2b is an integer of 3 to 4. ### Claim 15 (depends on 4) The electrophotographic toner described in claim 4, wherein one of Rx1b and Rx2b in Formula (X-1b) represents a methyl group, and another one of Rx1b and Rx2b represents an ethyl group.