Invention Grant
- Patent Title: Inkjet recording ink
- Patent Title (中): 喷墨记录油墨
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Application No.: US13706633Application Date: 2012-12-06
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Publication No.: US08815002B2Publication Date: 2014-08-26
- Inventor: Minoru Hakiri , Mitsuru Naruse , Masayasu Nonogaki , Naoya Morohoshi
- Applicant: Minoru Hakiri , Mitsuru Naruse , Masayasu Nonogaki , Naoya Morohoshi
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd.
- Current Assignee: Ricoh Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2011-268789 20111208; JP2012-020341 20120201
- Main IPC: C09D11/02
- IPC: C09D11/02

Abstract:
An inkjet recording ink including: water; a first pigment dispersion; a second pigment dispersion; and a penetrating agent, wherein the first pigment dispersion includes oxidized carbon black CB-1 dispersed therein with a pH of the first pigment dispersion adjusted to 6 to 8 with an alkali metal hydroxide, where the oxidized carbon black CB-1 is oxidized with ozone and has a volatile content of 10% to 20% and a BET specific surface area of 90 m2/g to 150 m2/g, and the second pigment dispersion includes carbon black CB-2 dispersed therein with a naphthalene sulfonic acid-formalin condensate, where the carbon black CB-2 has an average particle diameter (D50) of 50 nm to 180 nm as measured by a dynamic light scattering method and a standard deviation of particle diameters of the carbon black CB-2 is equal to or lower than ½ of the average particle diameter.
Public/Granted literature
- US20130147876A1 INKJET RECORDING INK Public/Granted day:2013-06-13
Information query
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