Pigment composition production method
AssigneeKao Corporation
InventorsShuichi Abe, Tsuyoshi Oda, Toshiya Iwasaki
Life of this patent
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Abstract
The present invention relates to [1] a process for producing a pigment composition, including the step of subjecting a raw material pigment composition containing C.I. Pigment Yellow 74, a specific by-product and water to heat treatment at a temperature of from 160 to 210° C.; and [2] a method of reducing a content of a by-product in a raw material pigment composition containing C.I. Pigment Yellow 74, the specific by-product and water, said method including the step of subjecting the raw material pigment composition to heat treatment at a temperature of from 160 to 210° C.
Claims21
A process for producing a pigment composition, comprising the step of subjecting a raw material pigment composition comprising C.I. Pigment Yellow 74, a compound (I) represented by the following formula (I-1) or (I-2) and water to heat treatment at a temperature of not lower than 160° C. and not higher than 210° C.:
A method of reducing a content of a compound (I) represented by the following formula (I-1) or (I-2) in a raw material pigment composition comprising C.I. Pigment Yellow 74, the compound (I) represented by the following formula (I-1) or (I-2) and water, said method comprising the step of subjecting the raw material pigment composition to heat treatment at a temperature of not lower than 160° C. and not higher than 210° C.:
Dependencies are inferred from the claim text.