25-10-2018 дата публикации
Номер: US20180305553A1
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. 2. The process for producing a pigment composition according to claim 1 , wherein a temperature used in the heat treatment is not lower than 165° C. and not higher than 210° C.3. The process for producing a pigment composition according to claim 1 , wherein the heat treatment is conducted for a time of not less than 1 second and not more than 25 minutes.4. The process for producing a pigment composition according to claim 1 , wherein the heat treatment is conducted for a time of not less than 5 seconds and not more than 25 minutes.5. The process for producing a pigment composition according to claim 1 , wherein the time of the heat treatment is controlled such that a value of X represented by the following formula (1) is not less than 3×10and not more than 1:{'br': None, 'i': X', 'k', 't, '[−]=Decomposition rate constant [l/s]×time [s]\u2003\u2003(1).'}6. The process for producing a pigment composition according to claim 1 , wherein the time of the heat treatment is controlled such that a value of X represented by the following formula (1) is not less than 3×10and not more than 5×10:{'br': None, 'i': X', 'k', 't, '[−]=Decomposition rate constant [l/s]×time [s]\u2003\u2003(1).'}7. The process for producing a pigment composition according to claim 1 , wherein a content of the compound (I) in the pigment composition after the heat treatment is reduced to not more than 75% of a content of the ...
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