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US 10,800,922 B2Granted
Pigment composition production method
AssigneeKao Corporation
InventorsShuichi Abe, Tsuyoshi Oda, Toshiya Iwasaki, Masayuki Narita
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AssigneeKao Corporation
InventorsShuichi Abe, Tsuyoshi Oda, Toshiya Iwasaki, Masayuki Narita
Estimating the term…
The present invention relates to [1] a process for producing a pigment composition, including the step of subjecting a raw material pigment composition containing PY74 and a specific by-product to a treatment with an oxidizing agent, in which a content of the specific by-product in the pigment composition after the treatment on the basis of a content of PY74 in the pigment composition after the treatment is not more than 1,200 mg/kg; [2] a process for producing a pigment composition, including the step of subjecting a raw material pigment composition containing PY74, a specific by-product and water to a treatment with hydrogen peroxide; [3] a method of reducing a content of a specific by-product in a raw material pigment composition containing PY74 and the specific by-product, said method including the step of subjecting the raw material pigment composition to a treatment with an oxidizing agent; and [4] a method of preventing an ink for ink-jet printing from suffering from ejection defects, including the step of compounding the pigment composition produced by any of the aforementioned processes in the ink for ink-jet printing.
A process for producing a pigment composition, comprising the step of subjecting a reaction system, comprising a raw material pigment composition comprising C.I. Pigment Yellow 74 and a compound (I) represented by the following formula (I-1) or (I-2), to a treatment with an oxidizing agent, wherein the treatment with the oxidizing agent comprises stirring the reaction system with a stirring blade at a shear rate of not less than 10 s−1 and not more than 100,000 s−1, in which a content of the compound (I) in the pigment composition after the treatment with the oxidizing agent on the basis of a content of the C.I. Pigment Yellow 74 in the pigment composition after the treatment with the oxidizing agent being not more than 1,200 mg/kg:
Dependencies are inferred from the claim text.